CN113725995B - Dual-backup power supply management system and management method for power distribution terminal - Google Patents
Dual-backup power supply management system and management method for power distribution terminal Download PDFInfo
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- CN113725995B CN113725995B CN202110974862.4A CN202110974862A CN113725995B CN 113725995 B CN113725995 B CN 113725995B CN 202110974862 A CN202110974862 A CN 202110974862A CN 113725995 B CN113725995 B CN 113725995B
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- 238000007726 management method Methods 0.000 title abstract description 33
- 238000007599 discharging Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 22
- 230000009977 dual effect Effects 0.000 claims abstract description 12
- 230000002159 abnormal effect Effects 0.000 claims abstract description 9
- 238000005259 measurement Methods 0.000 claims description 13
- 230000002441 reversible effect Effects 0.000 claims description 13
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 8
- 229910052744 lithium Inorganic materials 0.000 claims description 8
- 239000003990 capacitor Substances 0.000 claims description 7
- 239000002253 acid Substances 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 5
- 230000002265 prevention Effects 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 8
- 238000004146 energy storage Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 125000003275 alpha amino acid group Chemical group 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000003862 health status Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J1/00—Circuit arrangements for dc mains or dc distribution networks
- H02J1/10—Parallel operation of dc sources
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0034—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using reverse polarity correcting or protecting circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Stand-By Power Supply Arrangements (AREA)
Abstract
The invention discloses a dual-backup power supply management system of a power distribution terminal and a management method thereof. The improved power distribution terminal adopts double backup power supplies, and when an external power supply and a main backup power supply of the power distribution terminal fail at the same time, the auxiliary backup power supplies can also ensure switch opening and closing. According to the method, the backup power supply switching module is added between the dual backup power supplies and the charging and discharging loop, so that charging and discharging management of the dual backup power supplies under one charging loop is flexibly realized, the functions of floating charge prevention, over-discharging prevention, flexible switching of the dual backup power supplies and the like are realized on the premise of guaranteeing the reliability of the system by the periodic and opposite charging and discharging management method, the service life of a battery is prolonged, abnormal power supplies can be screened out on the other hand, and the reliability of the whole system is improved.
Description
Technical Field
The invention relates to the technical field of power distribution of power systems, in particular to a backup power supply management system of a power distribution terminal with multiple backup power supplies in a power distribution network of 66kV or below and a management method thereof.
Background
In recent years, with the increase of the requirements of people on the power supply quality, the distribution network of China rapidly develops. In order to quickly locate and isolate faults when a distribution line breaks down, more and more distribution terminals are installed in a distribution network, when the line breaks down, the distribution terminals can send fault signals to a main station, and can generally trip out a fault line switch on site or receive a main station remote control command, and in areas with high power supply requirements, the switch can be closed to restore power supply after the fault isolation is completed.
At present, the main power supply of the power distribution terminal is mainly an external power supply, and is generally taken from a line, and when the line runs normally in a live state, primary high voltage is converted into low voltage suitable for running of the power distribution terminal through a voltage transformer or an internal power supply electrode column of a switch. In order to ensure that the power distribution terminal can normally operate and provide enough energy for switching on and off operation of a switch when a line fails or has a short-time power failure, a common solution is to configure a backup power supply for the power distribution terminal, wherein the backup power supply mainly comprises a lead-acid storage battery, a lithium battery and a super capacitor, and the lead-acid storage battery and the lithium battery are widely used because of large capacity and long endurance time.
However, since the power distribution terminals are mostly installed in outdoor remote areas and the operation environment is bad, the backup power supply is often disabled after a period of operation, so that enough energy cannot be provided for switching on and off the switch. Once failure, not only is manual to be disposed on site, but also accidents are easily caused to be enlarged, the power failure range is increased, and serious economic loss and social hazard are brought.
The current common solutions are to detect the health status of the only backup power supply of the power distribution terminal on line, and although the methods can enable the status of the backup power supply to be perceived in advance, in practice, the backup power supply failure often occurs at the moment of switching on and off the switch, and at this time, the problem of switch failure cannot be immediately solved even if the backup power supply abnormality is evaluated.
On the other hand, the backup power supply of the common power distribution terminal can continue to float after being fully charged, and for the situation that the backup power supply is a battery, the service life of the battery can be reduced for a long time.
Aiming at the requirements, if the secondary backup power supply can ensure the switch to be switched on or off after the main power supply and the backup power supply of the power distribution terminal fail, the service life of the backup power supply can be prolonged through some management methods, and the reliability and the economy of the whole system can be greatly improved.
Disclosure of Invention
The invention aims to provide a power distribution terminal dual-backup power supply management method which improves an existing single-backup power supply.
In order to achieve the above purpose, the invention adopts the following technical scheme:
in one aspect, the invention provides a dual backup power management system for a power distribution terminal, comprising: the power supply system comprises a main backup power supply module, an auxiliary backup power supply module, a discharging loop module, a charging loop module, a backup power supply switching module, an external power supply and a power distribution terminal measurement and control module, wherein the input end of the discharging loop module is respectively connected with the main backup power supply module and the auxiliary backup power supply module through the backup power supply switching module; the main backup power supply module and the auxiliary backup power supply module are connected to an external switch loop through the backup power supply switching module; the power distribution terminal measurement and control module is respectively connected with an external power supply, a main backup power supply module and an auxiliary backup power supply module; and the power distribution terminal measurement and control module is also connected with the control end of the backup power supply switching module and is used for controlling a control signal of on-off of a switch in the backup power supply switching module.
Further, the system further comprises a first reverse connection preventing module and a second reverse connection preventing module, wherein the first reverse connection preventing module is connected between the backup power supply switching module and the main backup power supply module, and the second reverse connection preventing module is connected with the backup power supply switching module and the auxiliary backup power supply module.
Still further, the backup power switching module includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch; the first end of the first switch is connected with the positive electrode of the input end of the auxiliary backup power supply, the second end of the first switch is connected with the positive electrode of the input end of the charging loop, the first end of the seventh switch is connected with the positive electrode of the output end of the main backup power supply, the second end of the seventh switch is connected with the positive electrode of the discharge loop, the second ends of the first switch are respectively connected with the first end of the second switch and the first end of the fifth switch, the second end of the second switch is connected with the first end of the seventh switch, the first end of the sixth switch is connected with the first end of the first switch and the first end of the third switch, the second end of the fourth switch and the second end of the fifth switch are connected together and are connected to the positive electrode of the external switch loop, and the negative electrodes of the main auxiliary backup power supply and the auxiliary backup power supply are connected to the negative electrode of the external switch.
In a second aspect, the present invention further provides a method for managing a dual-backup power management system of a power distribution terminal, where the dual-backup power management system of a power distribution terminal adopts the dual-backup power management system of a power distribution terminal provided by any one of the possible embodiments of the above technical solution, and the method includes the following steps:
collecting the voltages of a main backup power supply and an auxiliary backup power supply by using a power distribution terminal measurement and control module, and detecting whether an external power supply has electricity or not;
if the power distribution terminal measurement and control module detects that the external power supply is electrified, charging any one of the main backup power supply and the auxiliary backup power supply when the voltage of the backup power supply is lower than a charging voltage threshold; stopping charging the backup power supply when detecting that the main backup power supply or the auxiliary backup power supply is fully charged;
if the external power supply is detected to be unpowered, when the voltage of the main backup power supply is higher than the under-voltage threshold or the voltage of the auxiliary backup power supply is lower than the under-voltage threshold, the power distribution terminal measurement and control module outputs a control signal to the backup power supply switching module to switch to the main backup power supply to supply power to the power distribution terminal, otherwise, the power distribution terminal is switched to the auxiliary backup power supply to supply power to the power distribution terminal;
the power distribution terminal outputs a control signal to the backup power supply switching module to perform charge and discharge management on the main backup power supply and the auxiliary backup power supply;
when the switching-on and switching-off energy is required to be provided for the external switch loop, judging whether the external power supply can provide energy larger than the energy required by switching on and switching off of the switch, and if so, using the energy of the external power supply to switch on and off; if the main power supply and the auxiliary power supply can not provide the switching on/off energy, the auxiliary power supply is used for providing the switching on/off energy.
Specifically, in the above scheme, the main backup power source capacity is larger than the auxiliary backup power source capacity, the main backup power source adopts a lead-acid storage battery or a lithium battery, the auxiliary backup power source adopts a super capacitor or a lithium battery, the auxiliary backup power source capacity is not larger than the main backup power source capacity, and generally, the auxiliary backup power source capacity is smaller than 1/3 of the main backup power source capacity.
Specifically, in the above scheme, the external power supply may be composed of one or more external power supplies, and the external power supplies may be a voltage transformer, an in-switch electrode supply column, a photovoltaic panel, or the like, and when any external power supply voltage is greater than a power supply voltage threshold of the power distribution terminal, the external power supply may be considered to have power.
In the scheme, the power distribution terminal is opened or closed through the MOS tube or the relayA backup power source is charged or stopped, and the charging voltage threshold of each backup power source can be independently set. If it is detected that the two backup power voltages are lower than the charging voltage threshold, a typical charging strategy is to charge the small-capacity backup power first, that is, charge the auxiliary backup power first, and charge the auxiliary backup power voltage to the auxiliary backup power charging completion voltage thresholdAnd then, disconnecting the charging loop for charging the auxiliary backup power supply. Then charging the main back-up power supply until the voltage of the main back-up power supply reaches the threshold of the charging completion voltage of the main back-up power supply +.>And then, disconnecting the charging loop for charging the main and standby power supplies. In order to prevent the reverse connection of the positive electrode and the negative electrode of the backup power supply, the front stage of the charging loop adopts a reverse connection preventing loop design.
Specifically, in the above scheme, if the auxiliary backup power supply is lower than the undervoltage threshold and meets the undervoltage alarm criterion, an undervoltage alarm signal is returned, and the undervoltage alarm criterion is:
(1)
the under-voltage alarm signal return condition is:
(2)
in the method, in the process of the invention,representing the backup supply voltage, +.>Representing the undervoltage threshold of the backup power supply, < >>Indicating the duration of the backup power supply voltage below the backup power supply under-voltage threshold, +.>、/>A constant greater than 1->For storing energy for the switch, i.e. when it is detected that the back-up supply voltage is below the threshold +.>The meridian>The back-up power supply is under-voltage after time, when the back-up power supply voltage is greater than +>Double threshold->When the alarm signal is in the low voltage state, the alarm signal returns immediately or after a delay.
In the middle ofTypical values are 1.1-1.3,/day>Typical values are 1.005-1.05.
Specifically, in the above scheme, the discharge periods of the main backup power supply and the auxiliary backup power supply may be set respectively. When the backup power supply is a battery, the typical value of the discharge period is 1-2 months; when the backup power supply is a super capacitor, the typical value of the discharge period takes 2-6 months.
In order to avoid the problem that the reliability is reduced due to insufficient switching-on and switching-off energy of an emergency, which is caused by the fact that the voltages of the two backup power supplies are too low when the two backup power supplies are simultaneously discharged, the main backup power supply and the auxiliary backup power supply do not enter a discharging process at the same time.
When one backup power supply is in discharge management and the other backup power supply is in discharge time, the discharging and charging of the backup power supply is finished, and then the discharging flow of the other backup power supply is executed.
When one backup power supply needs to be subjected to discharge management, detecting whether the other backup power supply is under-voltage or not, and if so, fully charging the under-voltage backup power supply and then executing a backup power supply discharge flow to be subjected to discharge management.
And for the backup power supply with the discharge time which does not reach the expected value, the power distribution terminal prompts the corresponding backup power supply to discharge abnormal or low-capacity signals so as to remind operation and maintenance personnel of timely checking and replacing.
Specifically, in the above scheme, the power distribution terminal may set three or more modes of "the external power supply cannot provide the opening and closing energy", "the external power supply 1 can provide the opening and closing energy when it is powered on", "the opening and closing energy when any external power supply is powered on", so as to detect whether the external power supply can provide the opening and closing energy.
When the mode of 'the external power supply can not provide the opening and closing energy', the external power supply can not provide the opening and closing energy no matter whether the external power supply has electricity or not, the external power supply is generally used for supplying power to the internal pole of the switch, and the opening and closing energy needs to be provided by a backup power supply; when the mode of providing opening and closing energy when the external power supply 1 is powered on is set, the external power supply 1 is considered to provide opening and closing energy when the external power supply 1 is powered on; when the mode of providing opening and closing energy when any external power supply is powered on is set, the opening and closing energy can be provided by the external power supply when any external power supply is powered on.
After the power distribution terminal provides energy for the switch opening and closing, detecting whether the switch opening and closing is successful or not, and reporting an abnormal signal if the switch opening and closing is unsuccessful. If the external power supply can not provide the opening and closing energy or the opening and closing switch of the energy provided by the external power supply fails, detecting whether the energy of the main backup power supply can provide the opening and closing energy, and if the energy of the main backup power supply can not provide the opening and closing energy or the energy provided by the main backup fails, providing the opening and closing energy by using the auxiliary backup power supply.
The power distribution terminal double-backup power management method has the following beneficial effects:
after the double-backup power supply scheme is adopted, the problem that the single backup power supply of the power distribution terminal cannot be used for switching on or off the switch when the single backup power supply of the power distribution terminal fails or the energy is insufficient under the condition that the external power supply does not have the switching on or off of the switch is avoided, and the switching on and off reliability of the switch during line faults is improved. Meanwhile, an MOS tube or a relay is added between the double-backup power supply and the charging and discharging loop, so that the charging and discharging management of the double-backup power supply under one charging loop is flexibly realized. By the periodic and opposite charge and discharge management method, on the premise of ensuring the reliability of the system, floating charge prevention, over discharge prevention, flexible switching of double backup power supplies and the like are realized, so that the service life of the battery is prolonged, abnormal backup power supplies can be screened out, and the reliability of the whole system is improved.
The beneficial technical effects obtained by the invention are as follows: the invention adopts the double-backup power supply, and can ensure that the auxiliary backup power supply can also switch on and off when the external power supply and the main backup power supply of the power distribution terminal are simultaneously invalid. Meanwhile, the invention also provides a management method for preventing floating charge, overcharge and overdischarge, charge and discharge of a double-backup power supply, intelligent switching and the like, so that the service life of the battery is prolonged, and the reliability and the economy of the whole system are improved.
Drawings
FIG. 1 is a schematic diagram of an external power supply and distribution terminal dual backup power management and supply loop in accordance with an embodiment of the present invention;
fig. 2 is a logic flow diagram of dual backup power management for a power distribution terminal in accordance with an embodiment of the present invention.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a power distribution terminal double-backup power supply management system and a management method thereof, aiming at a power distribution terminal of a power distribution network system with the object of 66kV and below, wherein the system suitable for the method comprises an external power supply and a power distribution terminal, wherein the power distribution terminal is provided with two backup power supplies: the following description of the specific embodiments, with reference to the accompanying drawings, describes the steps of an example as follows:
step (1): the power distribution terminal (built-in power distribution terminal measurement and control module) collects the voltages of the main backup power supply and the auxiliary backup power supply, detects whether the external power supply is powered or not, and the structure and the method adopted by the power distribution terminal for detecting the external power supply are not the invention points of the invention in the prior art and are not described in detail.
Specifically, in fig. 1 of the embodiment, a main backup power supply and an auxiliary backup power supply are provided in a power distribution terminal. The front stage of the main backup power supply and the auxiliary backup power supply is provided with an anti-reverse connection circuit so as to avoid circuit damage caused by reverse connection of the anode and the cathode of the backup power supply.
The main backup power supply capacity is larger than the auxiliary backup power supply capacity, the main backup power supply adopts a lead-acid storage battery or a lithium battery, the auxiliary backup power supply adopts a super capacitor or a lithium battery, and the typical value of the auxiliary backup power supply capacity is smaller than 1/3 of the main backup power supply capacity. In the embodiment, the main backup power supply adopts a lithium iron phosphate battery with the rated voltage level of 25.6V and the capacity of 12AH, and the auxiliary backup power supply adopts a lithium iron phosphate battery with the rated voltage level of 25.6V and the capacity of about 3 AH. If the auxiliary backup power supply adopts a super capacitor, the capacity can be selected to be similar to that of a finished product.
The power distribution terminal detects that an external power supply is electrified, and when detecting that the voltage of any one of a main backup power supply and an auxiliary backup power supply is lower than a charging voltage threshold, the power distribution terminal outputs a control signal to a backup power supply switching module to charge the backup power supply; when detecting that a certain backup power supply is fully charged, outputting a control signal to the backup power supply switching module to realize that the backup power supply is stopped from being charged, and avoiding the backup power supply from being charged in a floating way for a long time to reduce the service life of the backup power supply.
Specifically, in fig. 1 of the embodiment, the power distribution terminal collects the voltages of the main backup power supply and the auxiliary backup power supply (this is the prior art), collects the voltages of the external power supply 1 and the external power supply 2, and compares whether the external power supply has electricity or not with a voltage threshold set in advance through the collected voltages.
In the embodiment shown in fig. 1, the external power supplies are 2 external power supplies, the external power supply 1 supplies power to the electrode column in the switch, the external power supply 2 is a photovoltaic panel, and when any external power supply voltage is greater than the power supply voltage threshold of the power distribution terminal, the external power supply can be considered to have power.
And (3) the power distribution terminal detects that the external power supply is not powered, and when the voltage of the main backup power supply is higher than the under-voltage threshold or the voltage of the auxiliary backup power supply is lower than the under-voltage threshold, the main backup power supply is switched to supply power to the power distribution terminal, otherwise, the auxiliary backup power supply is switched to supply power to the power distribution terminal, so that the backup power supply is prevented from being influenced by long-term floating charge.
Specifically, in fig. 1 of the embodiment, a charging loop module, a discharging loop module, and a backup power supply switching module formed by a plurality of MOS transistors or relays are arranged in a power distribution terminal, wherein in fig. 1, a first switch K1 to a ninth switch K9 are MOS transistors or relays or other components with a switching-off function, and specific selection is flexibly selected according to the spatial layout of components in a board card and the current capacity of contacts. In the present embodiment of the present invention,
charging or stopping charging of a certain backup power supply is realized by a MOS tube or relay switching mode, and the charging voltage threshold of each backup power supplyCan be independently arranged. If it is detected that the two backup power voltages are lower than the charging voltage threshold, a typical charging strategy is to charge the small-capacity backup power first, that is, charge the auxiliary backup power first, and charge the auxiliary backup power voltage to the auxiliary backup power charging completion voltage threshold>And then, disconnecting the charging loop for charging the auxiliary backup power supply. Then charging the main back-up power supply until the voltage of the main back-up power supply reaches the threshold of the charging completion voltage of the main back-up power supply +.>After that, the main and standby power supplies are disconnected to chargeIs provided. In order to prevent the reverse connection of the positive electrode and the negative electrode of the backup power supply, the front stage of the charging loop adopts a reverse connection preventing loop design.
Referring to fig. 2 of the embodiment, when the auxiliary backup power supply is to be charged, it is detected whether any external power supply is charged, if so, then it is detected whether the auxiliary backup power supply is charging, if not, it is continuously detected whether the voltage of the auxiliary backup power supply is lower than the charging voltage threshold of the auxiliary backup power supplyAnd if yes, executing the closing of the K1 contact to realize the charging of the auxiliary backup power supply. If the auxiliary backup power supply voltage is detected to be greater than the finishing voltage threshold +.>And then, the K1 contact is disconnected, so that the disconnection of a charging loop is realized, and the overcharge or floating charge of the auxiliary backup power supply is prevented.
When the main backup power supply is to be charged, detecting whether the external power supply is electrified, if yes, detecting whether the auxiliary backup power supply is charged, and if no, continuously detecting whether the voltage of the main backup power supply is lower than the charging voltage threshold of the main backup power supplyAnd if yes, executing the closing of the K2 contact to realize the charging of the auxiliary backup power supply. If the main and backup power supply voltages are detected to be larger than the threshold of the finishing voltage in the charging process>And then, the K2 contact is disconnected, so that the disconnection of a charging loop is realized, and the overcharge or floating charge of the main and standby power supplies is prevented.
The embodiment example realizes the scheme of charging two different backup power supplies through one charging module. The external power supply is powered off, and the external power supply voltage is lower than the power supply voltage threshold of the power distribution terminal.
In the embodiment, the main and backup power supply undervoltage alarm criteria are as follows:
(3)
in the formula (3), the amino acid sequence of the compound,representing the main backup supply voltage,/v>Representing the undervoltage threshold of the main backup power supply, +.>Indicating the duration of the main backup power supply voltage below the main backup power supply undervoltage threshold +.>A constant greater than 1->The energy storage time is stored for the switch. I.e. when it is detected that the main backup power supply voltage is below the main backup power supply undervoltage threshold +.>The meridian is greater than->(wherein->) And after the energy storage time of the switch is multiplied, the undervoltage of the main backup power supply is reported.
After the main backup power supply reports the undervoltage signal, the undervoltage signal returns to the condition that the voltage of the main backup power supply is larger than that of the main backup power supply(wherein->) Double main backup power supply undervoltage threshold +.>After the delay, the return is carried out, and the typical delay value is 10s.
The auxiliary backup power supply undervoltage alarm criterion is as follows:
(4)
in the formula (4), the amino acid sequence of the compound,representing auxiliary backup supply voltage, < >>Represents an auxiliary backup power undervoltage threshold,indicating the duration of the auxiliary backup power supply voltage being below the auxiliary backup power supply undervoltage threshold, +.>For a coefficient greater than 1>The energy storage time is stored for the switch. I.e. when the auxiliary backup power supply voltage is detected to be lower than the auxiliary backup power supply undervoltage thresholdThe meridian is greater than->(wherein->) And after the energy storage time of the switch is multiplied, the auxiliary backup power supply under-voltage is reported.
Reporting undershoot with auxiliary backup power supplyAfter the voltage signal, the under-voltage signal returns to the condition that the auxiliary backup power supply voltage is larger than(wherein->) Double main backup power supply undervoltage threshold +.>After the delay, the return is carried out, and the typical delay value is 10s.
Wherein the method comprises the steps ofTypical values are 1.1-1.3,/day>Typical values are 1.005-1.03.
And (4) the power distribution terminal regularly carries out charge and discharge management on the main backup power supply and the auxiliary backup power supply.
Specifically, the discharge periods of the main backup power supply and the auxiliary backup power supply may be set separately. When the backup power supply is a battery, the typical value of the discharge period is 1-2 months; when the backup power supply is a super capacitor, the typical value of the discharge period takes 2-6 months.
In order to avoid the problem that the voltage of the two backup power supplies is too low, which is possibly caused by the simultaneous discharge of the two backup power supplies, the reliability is reduced caused by the emergency such as insufficient switching-on and switching-off energy of a switch, and the situation that the main backup power supply and the auxiliary backup power supply enter a discharge flow simultaneously is avoided.
When the main and backup power supplies are to be discharged, the external power supplies are disconnected, namely the K8 and the K9 are disconnected, the K1, the K2 and the K6 are kept in the disconnected state, the contact K7 is closed, and the main and backup power supplies supply power to the device to achieve the discharging effect of the main and backup power supplies. When the auxiliary backup power supply is required to be discharged, the external power supply is disconnected, namely the K8 and the K9 are disconnected, the K1, the K2 and the K7 are kept in an open state, and the contact K6 is closed, so that the auxiliary backup power supply provides electric energy for the device to supply power, and the discharging effect of the auxiliary backup power supply is achieved.
In the discharging management process, if one backup power supply is in discharging management, and the other backup power supply also reaches the discharging time, the discharging process of the other backup power supply is executed after the discharging backup power supply finishes discharging and charging; when one backup power supply needs to be subjected to discharge management, detecting whether the other backup power supply is under-voltage or not, and if so, fully charging the under-voltage backup power supply and then executing a backup power supply discharge flow to be subjected to discharge management.
And for the backup power supply with the discharge time which does not reach the expected value, the power distribution terminal prompts the corresponding backup power supply to discharge abnormal or low-capacity signals so as to remind operation and maintenance personnel of timely checking and replacing.
Step (5), when the power distribution terminal needs to provide switching-on and switching-off energy for the switch, judging whether the external power supply can provide energy larger than the energy required by switching-on and switching-off of the switch, and if so, using the energy of the external power supply to switch on and off; if the main power supply and the auxiliary power supply can not provide the switching on/off energy, the auxiliary power supply is used for providing the switching on/off energy.
In particular, referring to fig. 2 of the embodiment, when the power distribution terminal needs to provide energy for the switch opening and closing, it detects whether the external power source has electricity, and if so, it detects whether the external power source can provide enough energy for the switch opening and closing. The threshold conditions in this embodiment may be set as three types by comparing the detected whether the external power supply can provide enough opening and closing energy with the threshold conditions set in advance: (1) The external power supply can not provide opening and closing energy, which means that the external power supply can not provide opening and closing energy no matter whether the external power supply is powered or not; (2) The external power supply 1 can provide opening and closing energy when power is supplied, which means that the external power supply can provide opening and closing energy only when the external power supply 1 is supplied with power, otherwise, the external power supply cannot provide opening and closing energy; (3) The "any external power source can provide switching-on and switching-off energy when being powered on" means that any external power source can provide switching-on and switching-off energy when being powered on. The threshold condition can be preset in advance through a fixed value or a pressing plate, and can be automatically judged through signal interaction with an external power supply.
In this embodiment, an example of a threshold condition set in advance is "the external power supply can provide opening and closing energy when power is supplied" is described with reference to fig. 1 of the embodiment. When the external power supply is detected to be electrified when the switching-on and switching-off is needed, the K5 contact in the figure 1 is closed, whether the switching-on and switching-off of the switch is successful or not is detected, if so, the switching-on and switching-off process is finished, and if not, an abnormal signal of switching-on and switching-off failure of the external power supply is reported. And detecting whether the main backup power supply is under-voltage or not, if the main backup power supply is under-voltage, opening the K5 contact, closing the K4 contact, using the main backup power supply to provide switching-on and switching-off energy, detecting whether a switch is successful in switching-on and switching-off, if the switch is successful, ending the switching-on and switching-off process, if the switch is unsuccessful, reporting a switching-on and switching-off failure abnormal signal of the main backup power supply, opening the K4 contact, closing the K3 contact, using the auxiliary backup power supply to provide switching-on and switching-off energy, detecting whether the switch is successful in switching-on and switching-off, if the switch is successful, ending the switching-on and switching-off process, and if the switch is unsuccessful, reporting a switching-on and switching-off failure abnormal signal of the auxiliary backup power supply.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereto, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the present invention.
Claims (9)
1. A dual backup power management system for a power distribution terminal, comprising: the power supply system comprises a main backup power supply module, an auxiliary backup power supply module, a discharging loop module, a charging loop module, a backup power supply switching module, an external power supply and a power distribution terminal measurement and control module, wherein the input end of the discharging loop module is respectively connected with the main backup power supply module and the auxiliary backup power supply module through the backup power supply switching module; the main backup power supply module and the auxiliary backup power supply module are connected to an external switch loop through the backup power supply switching module; the power distribution terminal measurement and control module is respectively connected with an external power supply, a main backup power supply module and an auxiliary backup power supply module; the power distribution terminal measurement and control module is also connected with the control end of the backup power supply switching module and is used for controlling a control signal of on-off of a switch in the backup power supply switching module;
the system also comprises a first reverse connection preventing module and a second reverse connection preventing module, wherein the first reverse connection preventing module is connected between the backup power supply switching module and the main backup power supply module, and the second reverse connection preventing module is connected with the backup power supply switching module and the auxiliary backup power supply module.
2. The dual backup power management system of a power distribution terminal of claim 1, wherein the backup power switching module comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, and a seventh switch; the first end of the first switch is connected with the positive electrode of the input end of the auxiliary backup power supply, the second end of the first switch is connected with the positive electrode of the input end of the charging loop, the first end of the seventh switch is connected with the positive electrode of the output end of the main backup power supply, the second end of the seventh switch is connected with the positive electrode of the discharge loop, the second ends of the first switch are respectively connected with the first end of the second switch and the first end of the fifth switch, the second end of the second switch is connected with the first end of the seventh switch, the second end of the seventh switch is connected with the second end of the sixth switch, the first end of the sixth switch is connected with the first end of the first switch, the second end of the third switch, the second end of the fourth switch and the second end of the fifth switch are connected together and are connected to the positive electrode of the external switch loop, and the output negative electrodes of the main backup power supply and the auxiliary backup power supply are connected to the negative electrode of the external switch loop.
3. The dual backup power management system of a power distribution terminal of claim 1, wherein the main backup power source is a lead-acid battery or a lithium battery, the auxiliary backup power source is a super capacitor or a lithium battery, and the auxiliary backup power source capacity is not greater than the main backup power source capacity.
4. The dual backup power management system of claim 1, wherein the external power source is at least one of a voltage transformer or an in-switch power pole or a photovoltaic panel.
5. A method for managing a dual-backup power management system of a power distribution terminal, wherein the dual-backup power management system of a power distribution terminal adopts the dual-backup power management system of a power distribution terminal according to any one of claims 1 to 4, and the method comprises the following steps:
collecting the voltages of a main backup power supply and an auxiliary backup power supply by using a power distribution terminal measurement and control module, and detecting whether an external power supply has electricity or not;
if the power distribution terminal measurement and control module detects that the external power supply is electrified, charging any one of the main backup power supply and the auxiliary backup power supply when the voltage of the backup power supply is lower than a charging voltage threshold; stopping charging the backup power supply when detecting that the main backup power supply or the auxiliary backup power supply is fully charged;
if the external power supply is detected to be unpowered, when the voltage of the main backup power supply is higher than the under-voltage threshold or the voltage of the auxiliary backup power supply is lower than the under-voltage threshold, the power distribution terminal measurement and control module outputs a control signal to the backup power supply switching module to switch to the main backup power supply to supply power to the power distribution terminal, otherwise, the power distribution terminal is switched to the auxiliary backup power supply to supply power to the power distribution terminal;
the power distribution terminal outputs a control signal to the backup power supply switching module to perform charge and discharge management on the main backup power supply and the auxiliary backup power supply;
when the switching-on and switching-off energy is required to be provided for the external switch loop, judging whether the external power supply can provide energy larger than the energy required by switching on and switching off of the switch, and if so, using the energy of the external power supply to switch on and off; if the main power supply and the auxiliary power supply can not provide the switching on/off energy, the auxiliary power supply is used for providing the switching on/off energy.
6. The method of claim 5, wherein if the external power source is more than one, considering that the external power source is powered when the voltage of any external power source is greater than the power taking voltage threshold of the power distribution terminal.
7. The method for managing a dual backup power management system of a power distribution terminal according to claim 5, wherein if the auxiliary backup power is lower than an undervoltage threshold and meets an undervoltage alarm criterion, an undervoltage alarm signal is returned, and the undervoltage alarm criterion is:
the under-voltage alarm signal return condition is:
U bak >k 2 U set ，k 2 in the formula (2) with a constant greater than 1, U bak Representing the back-up supply voltage, U set Representing the undervoltage threshold of the backup power supply, t bak Representing the duration, k, of the backup power supply voltage below the backup power supply under-voltage threshold 1 、k 2 A constant greater than 1, T storage For storing energy for the switch, i.e. when the back-up supply voltage is lower than U set Warp t bak The back-up power supply is under-voltage after time, when the back-up power supply voltage is larger than k 2 Double threshold U set And when the voltage is lower than the preset voltage, an under-voltage alarm signal returns.
8. The method for managing a dual backup power management system of a power distribution terminal according to claim 5, wherein the discharge periods of the main backup power source and the auxiliary backup power source are set separately and the main backup power source and the auxiliary backup power source do not enter the discharge flow at the same time.
9. The method for managing a dual-backup power management system of a power distribution terminal according to claim 5, wherein after energy is provided by switching on/off an external power switch, whether the switching on/off of the switch is successful is detected, and if the switching on/off is unsuccessful, an abnormal signal is reported; if the external power supply can not provide the opening and closing energy or the opening and closing switch of the energy provided by the external power supply fails, detecting whether the energy of the main backup power supply can provide the opening and closing energy, and if the energy of the main backup power supply can not provide the opening and closing energy or the energy provided by the main backup fails, providing the opening and closing energy by using the auxiliary backup power supply.
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