CN103715754A - UPS and power supply system - Google Patents
UPS and power supply system Download PDFInfo
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- CN103715754A CN103715754A CN201310695173.5A CN201310695173A CN103715754A CN 103715754 A CN103715754 A CN 103715754A CN 201310695173 A CN201310695173 A CN 201310695173A CN 103715754 A CN103715754 A CN 103715754A
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Abstract
The invention provides a UPS and a power supply system, relates to the field of a circuit, and generality of the UPS can be enhanced. The UPS comprises an input filter, and output filter, a controller and at least two cascaded power modules. The at least two cascaded power modules are respectively connected with the input filter and the output filter. Each power module comprises a rectification unit, an inversion unit and a bypass unit. The rectification unit is used for converting alternating current which is inputted from the input filter to the rectification unit into direct current and controlling the current which is inputted from the input filter to the rectification unit. The inversion unit is used for converting the direct current which is inputted from the rectification unit to the inversion unit into the alternating current and controlling voltage outputted by the inversion unit. The bypass unit is used for isolating a power module bypass in which the bypass unit is arranged after a control signal of the controller is received. The UPS and the power supply system are used for supplying power to loads after power failure.
Description
Technical field
The present invention relates to circuit field, relate in particular to a kind of UPS and electric power system.
Background technology
UPS(Uninterruptible Power Supply, uninterrupted power supply) be that storage battery is connected with main frame, by modular circuits such as main frame inverters, direct current is converted to the system equipment of civil power, be applied in each occasion of social life to improve the availability of electric power system, as ensured, computer system works on a period of time so that user can promptly deposit after having a power failure, and makes that user is unlikely affects work or obliterated data because of power failure.
UPS of the prior art is mainly comprised of five parts: the power supply input circuits such as main road, bypass, battery, carry out AC/DC(Alternating Current to Direct Current, alternating current turns direct current) conversion rectifier, carry out DC/AC(Direct Current to Alternating Current, capable of converting direct current into alternate current) inverter, inversion and bypass output switching circuit and the energy storage battery of conversion.But the structure of described rectifier and inverter is comparatively complicated, the voltage of input rectifier and the brownout of output inverter, and be the voltage of fixed size, cannot regulate according to the residing concrete circuit structure of UPS, so the versatility of UPS is lower.
Summary of the invention
Embodiments of the invention provide a kind of UPS and electric power system, can improve the versatility of UPS.
For achieving the above object, embodiments of the invention adopt following technical scheme:
On the one hand, provide a kind of the first uninterrupted power supply UPS, comprising:
Input filter, reflexes to the harmonic wave of the electric current of electric power public electric wire net for UPS described in filtering;
Output filter, for the harmonic wave of filtering output voltage and electric current;
The power model of at least two cascades, the input of the power model of described at least two cascades is connected with described input filter, the output of described power model is connected with described output filter, and described in each, power model comprises: rectification unit, inversion unit and by-pass unit;
Controller, described controller is used for by transmit control signal to regulate described power model to export to control the electric energy of described UPS in the cascade number of described UPS to by-pass unit;
Described rectification unit is used for the alternating current of inputting described rectification unit from described input filter to be converted into direct current, and controls input the electric current of described rectification unit from described input filter;
Described inversion unit is for the direct current of inputting described inversion unit from described rectification unit is converted into alternating current, and the voltage that described inversion unit is exported is controlled;
Described by-pass unit for isolating the power model bypass at described by-pass unit place after receiving the control signal of described controller.
Optionally, described rectification unit comprises: at least one in insulated gate bipolar transistor IGBT, thyristor and diode;
Described inversion unit comprises: at least one full-bridge IGBT.
Optionally, when described UPS is high frequency UPS, described rectification unit is comprised of the IGBT that adopts the back-to-back mode of full-bridge to connect;
Described inversion unit is comprised of the IGBT that adopts the back-to-back mode of full-bridge to connect;
Described power model also comprises high frequency transformer, and for described power model is carried out to high-frequency isolation, described rectification unit and described inversion unit are by described high frequency transformer electric coupling.
Optionally, when described UPS is power frequency UPS, the IGBT of described rectification unit adopts full-bridge mode or three-phase half-bridge mode to connect;
Described rectification unit is comprised of at least 4 thyristors;
Described inversion unit is comprised of a full-bridge IGBT;
Described UPS also comprises:
Industrial Frequency Transformer, the power model coupling of described Industrial Frequency Transformer and described at least two cascades, for carrying out power frequency isolation to power model described in each.
Optionally, described power model also comprises:
Battery unit, described battery unit is used to described power model that electric energy is provided, and described battery unit is articulated in described inversion unit.
Optionally, described power model adopts star connection to form three-phase system.
On the other hand, the invention provides a kind of electric power system, it is characterized in that, comprising:
An any described UPS above;
Optionally, also comprise:
Electric power public electric wire net, is used to described electric power system that electric energy is provided;
Load;
Wherein, in described electric power public electric wire net, a described UPS, described first, press and turn low-voltage distribution system and connect with described load, the output of described electric power public electric wire net is connected with the input of a described UPS, the output of a described UPS is connected with pressing the input turn low-voltage distribution system in described first, and pressure turns the output of low-voltage distribution system and the input of described load is connected in described first.
Optionally, described electric power system also comprises:
In second, press and turn low-voltage distribution system, press in described second to turn low-voltage distribution system for transferring the voltage of described electric power public electric wire net output to low pressure by pressure;
The 2nd UPS, the carrying voltage of described the 2nd UPS is low pressure, described low pressure is greater than 0V and is less than 1000V;
Wherein, the voltage of the carrying of a described UPS is middle pressure, described middle pressure is more than or equal to 1000V and is less than 35000V, in described second, press and turn low-voltage distribution system and connect with described the 2nd UPS, in described second, press and turn low-voltage distribution system, described the 2nd UPS and a described UPS, in described first, press and turn low-voltage distribution system parallel connection, the output of described electric power public electric wire net is connected with pressing the input that turns low-voltage distribution system in described second, in described second, press the output that turns low-voltage distribution system to be connected with the input of described the 2nd UPS, described the 2nd output of UPS and the input of described load are connected.
Optionally, described electric power system also comprises:
Low-voltage distribution system, described low-voltage distribution system is connected in described first and presses and turn between low-voltage distribution system and described load, for protecting and distribute offering the electric energy of described load.
The invention provides a kind of UPS and electric power system, this UPS comprises: input filter, reflexes to the harmonic wave of the electric current of electric power public electric wire net for UPS described in filtering; Output filter, for the harmonic wave of filtering output current; The power model of at least two cascades, the input of the power model of described at least two cascades is connected with described input filter, the output of described power model is connected with described output filter, and described in each, power model comprises: rectification unit, inversion unit and by-pass unit; Controller, described controller is used for by transmit control signal to regulate described power model to export to control the electric energy of described UPS in the cascade number of described UPS to by-pass unit; Described rectification unit is used for the alternating current of inputting described rectification unit from described input filter to be converted into direct current, and controls input the electric current of described rectification unit from described input filter; Described inversion unit is for the direct current of inputting described inversion unit from described rectification unit is converted into alternating current, and the voltage that described inversion unit is exported is controlled; Described by-pass unit for isolating the power model bypass at described by-pass unit place after receiving the control signal of described controller.So, owing to having adopted the power model of at least two cascades in UPS, and the number of described power model can regulate according to the control of controller, bypass isolation and the redundancy of each power model have been realized, make the input and output voltage of UPS adjustable, can adapt to different circuit structures, improve the versatility of UPS.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
A kind of UPS structural representation that Fig. 1 provides for the embodiment of the present invention;
A kind of power cell structure schematic diagram that Fig. 2 provides for the embodiment of the present invention;
The another kind of power cell structure schematic diagram that Fig. 3 provides for the embodiment of the present invention;
Another power cell structure schematic diagram that Fig. 4 provides for the embodiment of the present invention;
The another kind of UPS structural representation that Fig. 5 provides for the embodiment of the present invention;
Another UPS structural representation that Fig. 6 provides for the embodiment of the present invention;
Another power cell structure schematic diagram that Fig. 7 provides for the embodiment of the present invention;
A kind of electric power system structural representation that Fig. 8 provides for the embodiment of the present invention;
The another kind of electric power system structural representation that Fig. 9 provides for the embodiment of the present invention;
Another electric power system structural representation that Figure 10 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of UPS10, as shown in Figure 1, comprising:
The power model 103 of at least two cascades, the input of the power model 103 of described at least two cascades is connected with described input filter 101, the output of described power model 103 is connected with described output filter 102, and described in each, power model 103 comprises: rectification unit 1031, inversion unit 1032 and by-pass unit 1033;
Described rectification unit 1031 be converted into direct current for the alternating current that will input described rectification unit 1031 from described input filter 102, and to controlling from the electric current of the described rectification unit 1031 of described input filter 102 input;
Described inversion unit 1032 is for being converted into alternating current from the direct current of the described inversion unit 1032 of described rectification unit 1031 input, and the voltage that described inversion unit 1032 is exported is controlled; Described rectification unit 1031 and described inversion unit 1032 can be realized the input and output decoupling zero of described power model, and the input current of power model and output voltage are controlled respectively;
Described by-pass unit 1033 for the control signal receiving described controller 104 after by the power model bypass isolation at described by-pass unit place.
Example, when the reliability of power model is higher, the power model that by-pass unit 1033 can be turn-offed described by-pass unit 1033 places is connected with the partial circuit of described UPS10, after making part bypass isolation, this power model is not for UPS provides electric energy, also output short circuit in the time of can be by the input short circuit of power model, the power model that turn-offs described by-pass unit 1033 places is connected with whole circuit of described UPS10, and power model complete bypass from described UPS10 is isolated.For example, the first power model is any one module in the power model of described at least two cascades, when the first power model breaks down, controller transmits control signal and makes by-pass unit conducting to the by-pass unit of the first power model, the power model that turn-offs described by-pass unit place is connected with the circuit of described UPS, by the partially or completely isolation from UPS of this first power model, by other power models, proceed power supply, therefore can be called and realize the first power model bypass isolation, the number of the power model of now, working in UPS has reduced one, the second power model can be any one module outside the power model of described at least two cascades, when need to increase the electric energy output of UPS or replace described in during malfunctioning module in the power model of at least two cascades, controller transmits control signal by-pass unit is turn-offed to the by-pass unit of the second power model, the power model of opening described by-pass unit place is connected with the circuit of described UPS, remove the bypass isolation in this second power model and UPS, the second power model is powered, therefore can be called and realize the second power model redundancy, now, the number of the power model of working in UPS has increased by one.
So, owing to having adopted the power model of at least two cascades in UPS, and the number of described power model can regulate according to the control of controller, bypass isolation and the redundancy of each power model have been realized, make the input and output voltage of UPS adjustable, can adapt to different circuit structures, improve the versatility of UPS.
It should be noted that, described controller 104 can also with rectification unit 1031, inversion unit 1032 is electrically connected to, and controls respectively rectification unit 1031, the turn-on and turn-off of inversion unit 1032; Especially, also can the first controller be set for all rectification units 1031, this the first controller is controlled respectively the turn-on and turn-off of each rectification unit 1031 in UPS, for all inversion units 1032, second controller is set, this second controller is controlled respectively the turn-on and turn-off of each inversion unit 1032 in UPS.
Further, described rectification unit 1031 comprises: at least one in IGBT (Insulated Gate Bipolar Transistor, insulated gate bipolar transistor), thyristor and diode; Described inversion unit 1032 comprises: at least one full-bridge IGBT.Because thyristor and IGBT are that low-voltage device and reliability are high, cheap, the manufacturing cost that therefore can effectively save UPS, improves the reliability of UPS.The input and output voltage of each power model is lower simultaneously, effectively reduces switching loss, reduces the frequency of utilization of switch, therefore effectively reduces the loss of energy consumption.
It should be noted that, the structure of described power model 103 can be adjusted according to the application scenarios of the different loads of UPS system of living in and UPS, example, as shown in Figure 2, when described UPS10 is high frequency UPS, described rectification unit 1031 is comprised of the IGBT that adopts the back-to-back mode of full-bridge to connect; Described inversion unit 1032 is comprised of the IGBT that adopts the back-to-back mode of full-bridge to connect, and described rectification unit 1031 and described inversion unit 1032 can be the structures of full symmetric, special, does not draw by-pass unit in Fig. 2.Described power model 103 also comprises high frequency transformer 1034, and for described power model 103 is carried out to high-frequency isolation, described rectification unit 1031 and described inversion unit 1032 are by described high frequency transformer 1034 electric coupling.In UPS10, by the circuit structure in Fig. 2, the electric current of input power module 103 carries out high-frequency isolation by high frequency transformer 1034, through the two-stage rectification of rectification unit 1031 and high frequency transformer 1034, makes the circuit reliability of output higher.
When described UPS is power frequency UPS, the IGBT of described rectification unit can adopt full-bridge mode or three-phase half-bridge mode to connect.As shown in Figure 3, the IGBT of the rectification unit 1031 of described UPS adopts three-phase half-bridge mode to connect; Described rectification unit 1031 can be comprised of at least 4 thyristors, and preferred, described rectification unit 1031 is comprised of 6 thyristors; Described inversion unit 1032 is comprised of a full-bridge IGBT, i.e. 4 IGBT, be respectively T1, T2, T3 and T4 in Fig. 3, by-pass unit 1033 one end m in power model 103 are connected with the equipotentiality point x of IGBT-T1 and IGBT-T2, other end n is connected with the equipotentiality point y of IGBT-T3 and IGBT-T4, can be by power model 103 bypasses when m is connected with n two ends.
The structure of described power model 103 also can be as shown in Figure 4, and described rectification unit 1031 is comprised of at least 6 IGBT; Described inversion unit 1032 is comprised of a full-bridge IGBT, i.e. 4 IGBT, be respectively T1, T2, T3 and T4 in Fig. 3, by-pass unit 1033 one end m in power model 103 are connected with the equipotentiality point x of IGBT-T1 and IGBT-T2, other end n is connected with the equipotentiality point y of IGBT-T3 and IGBT-T4, can be by power model 103 bypasses when m is connected with n two ends.
Described power model 103 can adopt star connection or delta connection to form three-phase system, preferably, in the embodiment of the present invention, power model 103 adopts star connection to form three-phase system, and as shown in Figure 3 and Figure 4, described power model 103 exists a, b, tri-inputs of c.
Further, when described UPS is power frequency UPS, in order to carry out power frequency isolation, as shown in Figure 5, described UPS10 also comprises: Industrial Frequency Transformer 105, described Industrial Frequency Transformer 105 is coupled with the power model 103 of described at least two cascades, for power model described in each 103 is carried out to power frequency isolation.Winding in described Industrial Frequency Transformer 105 is corresponding one by one with each power model 103.In Fig. 5, main line input and bypass input adopt default configuration, the Lin1 of input filter 101 represents input filter inductance, Cin1 represents input filter capacitor, Tin-sX in Industrial Frequency Transformer 105 represents secondary winding, wherein X represents the numbering of secondary winding, in Fig. 5, suppose totally 6 power models 103, relative set 6 windings, wherein, Tin-p1 represents former limit winding, described Industrial Frequency Transformer 105 can be made phase shifting transformer, described d represents the phase shift angle of secondary winding, wherein, the d=0 ° of secondary winding Tin-s1, the d=0 ° of secondary winding Tin-s2, the d=0 ° of secondary winding Tin-s3, the d=30 ° of secondary winding Tin-s4, the d=30 ° of secondary winding Tin-s5, the d=30 ° of secondary winding Tin-s6, the processing of the rectification unit 1031 by Industrial Frequency Transformer 105 and each power model 103, can be so that the power factor (PF) of the circuit of input meets the demand of UPS, harmonic wave is controlled in percent 5.UPS can also comprise static switch, this static switch is by SCR(Silicon Controlled Rectifier, thyristor) form, for realizing input and output or the break-make of bypass, control function, once UPS break down, load overload or battery discharge is finished, this static switch can make load without the static by-pass that is automatically brought to interrupting, by bypass supply (civil power), be powered, thereby improve the reliability of system, also can improve the overload capacity of UPS simultaneously.Further, in Fig. 5, Lout represents output inductor, Cout and C13-15 represent output filter capacitor, and F16-18 represents fuse output, and SCR10-12 represents output switch, can be above-mentioned static switch, can be also contactor, and SCR7-9 represents by-pass switch, Q1 is input switch, and Q2 is by-pass switch, and Q3 is service switch, and Q4 is output switch, V_Inp_A represents input voltage A phase, V_Inp_B represents input voltage B phase, V_Inp_C represents input voltage C phase, CT7-9 represents output electric current measure transducer, CT1-2 represents input current detecting sensor, V_Out A represents output voltage A phase, V_Out_B represents output voltage B phase, V_Out C represents output voltage C phase, V_Out_N represents N line, described N line is the neutral line, it is active line, V_Out_G represents protection ground, be output as UPS voltage magnitude and frequency in 380V/400V/415V/50Hz presentation graphs 5, the voltage of this UPS carrying can be middle pressure, described middle pressure is more than or equal to 8000V and is less than 35000V, 3ph/4w represents the voltage specification standard of three-phase and four-line.
Because the structure of power model is different, the structure of corresponding UPS is also different, the structure that is input filter 101 and output filter 102 also needs to adjust, as shown in Figure 6, in UPS10, adopt power model as shown in Figure 2, main line input and bypass input adopt default configuration, and the Lin1 of input filter 101 represents input filter inductance, and Cin1 represents input filter capacitor.UPS can also comprise static switch, this static switch is comprised of SCR, for realizing input and output or the break-make of bypass, control function, once UPS break down, load overload or battery discharge is finished, this static switch can make load energy without the static by-pass that is automatically brought to interrupting, by bypass supply (civil power) power supply, thereby the reliability of raising system also can improve the overload capacity of UPS simultaneously.It should be noted that, in Fig. 6, Lout represents output inductor, Cout and C13-15 represent output filter capacitor, and F16-18 represents fuse output, and SCR10-12 represents output switch, can be above-mentioned static switch, can be also contactor, and SCR7-9 represents by-pass switch, Q1 is input switch, and Q2 is by-pass switch, and Q3 is service switch, and Q4 is output switch, V_Inp_A represents input voltage A phase, V_Inp_B represents input voltage B phase, V_Inp_C represents input voltage C phase, CT7-9 represents output electric current measure transducer, CT1-2 represents that input current detecting sensor V_Out A represents output voltage A phase, V_Out_B represents output voltage B phase, V_Out C represents output voltage C phase, V_Out_N represents N line, V_Out_G represents protection ground, be output as UPS voltage magnitude and frequency in 380V/400V/415V/50Hz presentation graphs 6, the voltage of this UPS carrying can be middle pressure, 3ph/4w represents the voltage specification standard of three-phase and four-line.
It should be noted that, UPS can also comprise circuit unit, and the as a whole circuit of this circuit unit comprises control circuit and electric energy output circuit etc., is connected respectively with each power model, is used to UPS that electric energy is provided.
But; due to the as a whole circuit of described battery unit; structure is comparatively complicated; when battery unit breaks down; whole UPS can not switch to battery mode; even if redundancy or bypass circuit are installed, battery unit is protected, also may be caused due to the complex structure of battery unit the shortcomings such as switching loss is large, power consumption is high.Therefore the embodiment of the present invention also provides a kind of UPS10, as shown in Figure 5 and Figure 6, in this UPS10, described power model 103 also comprises: battery unit 1034, described battery unit 1034 is used to described power model 103 that electric energy is provided, and described battery unit 1034 is articulated in described inversion unit 103.Described battery unit 1034 can comprise battery a and BCB(Battery Control Box, battery control cabinet) b.This battery a is for being used to described power model 103 that electric energy is provided, and BCB b is for controlling the electric energy output of battery a, and all battery units 1034 in UPS cascade up provides electric energy for UPS.Concrete, as shown in Figure 7, power model 103 comprises rectification unit 1031, inversion unit 1032, by-pass unit (Fig. 7 does not indicate) and battery unit 1034, the BCB b of this battery unit 1034 is comprised of switch b1, b2 and b3, the output of battery unit 1034 is connected with the input of inversion unit 1032, when switch b1, b2 and b3 simultaneously closed, the circuit turn-on of battery unit, battery a exports electric energy; Any one switch in switch b1, b2 and b3 disconnects, and the circuit of battery unit turn-offs, and the electric energy of battery a cannot be exported.
Because battery unit is articulated in each power model, when the battery unit of a power model goes wrong, redundancy unit corresponding to this battery unit can be got involved and born the work of trouble unit, also can be by this power model bypass, avoid the impact on other power models, the electric energy that can also be directly turn-offs the battery of this battery unit by BCB is exported, other parts of power model are normally worked, therefore the battery unit being articulated in each power model is convenient to control, be convenient to change, reduced the switching loss of whole UPS, reduced the power consumption of controlling battery unit.
The UPS that the embodiment of the present invention provides, owing to having adopted the power model of at least two cascades, and the number of described power model can regulate according to the control of controller, bypass isolation and the redundancy of each power model have been realized, make the input and output voltage of UPS adjustable, can adapt to different circuit structures, improve the versatility of UPS; Meanwhile, because battery unit is articulated in power model, make battery unit be convenient to control, be convenient to change, reduced the switching loss of whole UPS, reduced the power consumption of controlling battery unit.Bypass isolation and the redundancy of each power model, also have the independence of battery unit all greatly to improve the reliability of ups system.
The embodiment of the present invention provides a kind of electric power system, comprising:
A UPS described in above any embodiment of the present invention.
Concrete, as shown in Figure 8, the electric power system 80 that the embodiment of the present invention provides comprises:
Electric power public electric wire net 801, is used to described electric power system 80 that electric energy is provided.
The one UPS802;
In first, press to turn in low-voltage distribution system 803, the first and press and turn low-voltage distribution system 103 for transferring the voltage of a described UPS output to low pressure by pressure, described low pressure is greater than 0V and is less than 1000V.This presses the system that turns the voltage of transformation that low-voltage distribution system 803 can be comprised of multiple controller switching equipment (or element) and distribution facility in first;
Wherein, in described electric power public electric wire net 801, a described UPS802, described first, press and turn low-voltage distribution system 803 and connect with described load 804, the output 801 of described electric power public electric wire net is connected with the input of a described UPS802, the output of a described UPS802 is connected with pressing the input turn low-voltage distribution system 803 in described first, and the output that pressure turns low-voltage distribution system 803 in described first is connected with the input of described load 804.
Further, as shown in Figure 9, described electric power system 80 also comprises:
In second, press and turn low-voltage distribution system 805 and the 2nd UPS806.
In described second, press and turn low-voltage distribution system 805 for transferring the voltage of described electric power public electric wire net output to low pressure by pressure.
The carrying voltage of described the 2nd UPS806 is low pressure, and described low pressure is greater than 0V and is less than 8000V.
Wherein, the voltage of the carrying of a described UPS802 is middle pressure, described middle pressure is more than or equal to 8000V and is less than 35000V, in described second, press and turn low-voltage distribution system 805 and connect with described the 2nd UPS806, in described second, press and turn low-voltage distribution system 805, described the 2nd UPS806 and a described UPS802, in described first, press and turn low-voltage distribution system 803 parallel connections, the output of described electric power public electric wire net 801 is connected with pressing the input that turns low-voltage distribution system 805 in described second, in described second, press the output that turns low-voltage distribution system 805 to be connected with the input of described the 2nd UPS806, the output of described the 2nd UPS806 is connected with the input of described load 804.
Due to press in first turn low-voltage distribution system 803 be mainly used in by the voltage of a described UPS output by pressure transfer low pressure to, therefore for load is protected, as shown in figure 10, described electric power system 80 can also comprise:
Low-voltage distribution system 807, described low-voltage distribution system 807 is connected in described first and presses and turn between low-voltage distribution system 803 and described load 804, for protecting and distribute offering the electric energy of described load 804.The electric power networks system of directly distributing electric energy to terminal use that this low-voltage distribution system 807 can be comprised of multiple controller switching equipment (or element) and distribution facility, will press the voltage distribution that turns low-voltage distribution system 803 outputs to each load in first.
Especially, according to the regulation of China < < urban power network planning design guide rule > >, the voltage of low-voltage distribution system is 380V, 220V.
In embodiments of the present invention, owing to having adopted a UPS in electric power system, centering presses the switching current that turns low-voltage distribution system to require to reduce, and the cost of a UPS is lower simultaneously, compared with the 2nd UPS, can save a large amount of copper cash, therefore reduce the manufacturing cost of electric power system.Simultaneously because the operational efficiency of UPS is higher, conventionally more than 98%, after adding a UPS, the operational efficiency of electric power system improves, even in the redundant system configuration of 100%, the efficiency of whole electric power system can arrive 97.5% or higher conventionally, and the use of a UPS, can and reduce maintenance expense by less erection unit and be used for saving operating cost.It should be noted that, redundant system configuration, referring generally to UPS is not unit, may be 1+1 backup isotype.
In the several embodiment that provide in the application, should be understood that, disclosed system, device and unit, can realize by another way.For example, device embodiment described above is only schematic, for example, the division of described unit, be only that a kind of logic function is divided, during actual realization, can have other dividing mode, for example a plurality of unit or assembly can in conjunction with or can be integrated into another system, or some features can ignore, or do not carry out.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, indirect coupling or the communication connection of device or unit can be electrical or other form.
The described unit as separating component explanation can or can not be also physically to separate, and the parts that show as unit can be or can not be also physical locations, can be positioned at a place, or also can be distributed in a plurality of network element.Can select according to the actual needs some or all of unit wherein to realize the object of the present embodiment scheme.
In addition, above-mentioned integrated unit both can adopt the form of hardware to realize, and the form that also can adopt hardware to add SFU software functional unit realizes.
One of ordinary skill in the art will appreciate that: all or part of step that realizes said method embodiment can complete by the relevant hardware of program command, aforesaid program can be stored in a computer read/write memory medium, this program, when carrying out, is carried out the step that comprises said method embodiment; And aforesaid storage medium comprises: various media that can be program code stored such as ROM, RAM, magnetic disc or CDs.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (10)
1. a uninterrupted power supply UPS, is characterized in that, comprising:
Input filter, reflexes to the harmonic wave of the electric current of electric power public electric wire net for UPS described in filtering;
Output filter, for the harmonic wave of filtering output voltage and electric current;
The power model of at least two cascades, the input of the power model of described at least two cascades is connected with described input filter, the output of described power model is connected with described output filter, and described in each, power model comprises: rectification unit, inversion unit and by-pass unit;
Controller, described controller is used for by transmit control signal to regulate described power model to export to control the electric energy of described UPS in the cascade number of described UPS to by-pass unit;
Described rectification unit is used for the alternating current of inputting described rectification unit from described input filter to be converted into direct current, and controls input the electric current of described rectification unit from described input filter;
Described inversion unit is for the direct current of inputting described inversion unit from described rectification unit is converted into alternating current, and the voltage that described inversion unit is exported is controlled;
Described by-pass unit for isolating the power model bypass at described by-pass unit place after receiving the control signal of described controller.
2. UPS according to claim 1, is characterized in that,
Described rectification unit comprises: at least one in insulated gate bipolar transistor IGBT, thyristor and diode;
Described inversion unit comprises: at least one full-bridge IGBT.
3. UPS according to claim 2, is characterized in that, when described UPS is high frequency UPS,
Described rectification unit is comprised of the IGBT that adopts the back-to-back mode of full-bridge to connect;
Described inversion unit is comprised of the IGBT that adopts the back-to-back mode of full-bridge to connect;
Described power model also comprises high frequency transformer, and for described power model is carried out to high-frequency isolation, described rectification unit and described inversion unit are by described high frequency transformer electric coupling.
4. UPS according to claim 2, is characterized in that, when described UPS is power frequency UPS, the IGBT of described rectification unit adopts full-bridge mode or three-phase half-bridge mode to connect;
Described inversion unit is comprised of a full-bridge IGBT;
Described UPS also comprises:
Industrial Frequency Transformer, the power model coupling of described Industrial Frequency Transformer and described at least two cascades, for carrying out power frequency isolation to power model described in each.
5. according to the UPS described in claim 1 to 4 any one claim, it is characterized in that, described power model also comprises:
Battery unit, described battery unit is used to described power model that electric energy is provided, and described battery unit is articulated in described inversion unit.
6. according to the UPS described in claim 1 to 5 any one claim, it is characterized in that, described power model adopts star connection to form three-phase system.
7. an electric power system, is characterized in that, comprising:
A UPS described in claim 1 to 6 any one claim.
8. electric power system according to claim 7, is characterized in that, also comprises:
Electric power public electric wire net, is used to described electric power system that electric energy is provided;
Load;
Wherein, in described electric power public electric wire net, a described UPS, described first, press and turn low-voltage distribution system and connect with described load, the output of described electric power public electric wire net is connected with the input of a described UPS, the output of a described UPS is connected with pressing the input turn low-voltage distribution system in described first, and pressure turns the output of low-voltage distribution system and the input of described load is connected in described first.
9. electric power system according to claim 8, is characterized in that, described electric power system also comprises:
In second, press and turn low-voltage distribution system, press in described second to turn low-voltage distribution system for transferring the voltage of described electric power public electric wire net output to low pressure by pressure;
The 2nd UPS, the carrying voltage of described the 2nd UPS is low pressure, described low pressure is greater than 0V and is less than 1000V;
Wherein, the voltage of the carrying of a described UPS is middle pressure, described middle pressure is more than or equal to 1000V and is less than 35000V, in described second, press and turn low-voltage distribution system and connect with described the 2nd UPS, in described second, press and turn low-voltage distribution system, described the 2nd UPS and a described UPS, in described first, press and turn low-voltage distribution system parallel connection, the output of described electric power public electric wire net is connected with pressing the input that turns low-voltage distribution system in described second, in described second, press the output that turns low-voltage distribution system to be connected with the input of described the 2nd UPS, described the 2nd output of UPS and the input of described load are connected.
10. according to the electric power system described in claim 7 to 9 any one claim, it is characterized in that, described electric power system also comprises:
Low-voltage distribution system, described low-voltage distribution system is connected in described first and presses and turn between low-voltage distribution system and described load, for protecting and distribute offering the electric energy of described load.
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| CN201310695173.5A CN103715754A (en) | 2013-12-17 | 2013-12-17 | UPS and power supply system |
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