CN104569742B - A kind of island detection method suitable for user side micro-capacitance sensor - Google Patents
A kind of island detection method suitable for user side micro-capacitance sensor Download PDFInfo
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- CN104569742B CN104569742B CN201510021525.8A CN201510021525A CN104569742B CN 104569742 B CN104569742 B CN 104569742B CN 201510021525 A CN201510021525 A CN 201510021525A CN 104569742 B CN104569742 B CN 104569742B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a kind of multiple spot island detection method for being adapted to user side micro-capacitance sensor.The power supply for being directly accessed 380V bus bar sides is classified as A classes by this method, and the power supply of the sub- micro-capacitance sensor of family is classified as B classes；The isolated island alarm signal that each power supply is sent is received by central controller；The isolated island alarm signal for first determining whether that A class power supplys are sent after isolated island alarm signal is received, if A classes power supply then shows that floor power distribution network breaks down, user side micro-capacitance sensor integrally breaks down；It is on the contrary, it is determined that sub- micro-capacitance sensor where occurring the B class power supplys of isolated island failure, the power supply is the sub- micro-capacitance sensor of family for occurring unplanned property isolated island.This method can recognize whether system has isolated island by isolated island types value, when isolated island occurs, can also be recognized by isolated island types value and there occurs which type of isolated island, be conducive to ensureing the safe and stable and economical operation of micro-capacitance sensor.
Description
Technical field
The present invention relates to micro-capacitance sensor development field, the method that more particularly to island effect is detected after distributed power source access.
Background technology
With a large amount of accesses of the development of micro-capacitance sensor, and distributed power source, the possibility that isolated island occurs is increasing, by
In unplanned isolated island to user and many adverse effects of system, reliably considered based on power supply safety, anti-islanding protection is must
Need.The basis of anti-islanding protection is exactly isolated island detection, and isolated island detection is that micro-capacitance sensor is shifted from unplanned isolated island to islet operation
Premise, also to change control strategy and relaying configuration in micro-capacitance sensor play the role of it is important.Reliable and stable micro-capacitance sensor isolated island
Detection technique enables to micro-capacitance sensor central controller to find micro-capacitance sensor isolated island information and positioning isolated island in time, so as to controller and
When make scientific and reasonable operation control strategy, ensure the safe and stable and economical operation of micro-capacitance sensor.
Up to the present, a variety of isolated island detection methods for being adapted to distributed power source have been developed.Number is used in grid side
Detect that the working condition of each relay of distribution is most direct according to collection and the mode of supervisor control or carrier communication, this method does not have
There is check frequency, but economic cost is too high, poor practicability.Therefore, the overwhelming majority research all concentrate on current transformer side active and
Passive detection method.
Passive detection method is also known as internal passive method, and isolated island forms front and rear point of common coupling（PCC points）Electrical quantity can occur
Change, this method is exactly mainly to be produced by observing the voltage of power network, the change of frequency to determine whether isolated island.When DG deliveries
When differing larger with island load demand, isolated island produce back loading voltage and frequency can produce very big variation, now by
Dynamic detection method is applicable.
Active detecting method is also known as internal active technique, and this method control current transformer exports a disturbance, and the sound of detecting system
It should judge whether unplanned property isolated island occurs, the advantage of active detecting method is that check frequency is small, detection speed is fast, but shortcoming
Equally obvious, i.e., the quality of power supply to user side micro-capacitance sensor affects.Active detecting method mainly includes magnitude shift
Method, frequency deviation method and phase shift method three major types, wherein the most universal with frequency deviation method application.
At present, the actively and passively formula isolated island that the isolated island detection for micro-capacitance sensor lays particular emphasis on current transformer with Protective strategy is examined
Survey technology, wherein active alone island detection technique are then the emphasis of research, are also isolated island detection in current inverter type product
The technology generally used.
Based on the research to active alone island detection technique, the topological structure of user side micro-capacitance sensor is being analyzed, it is contemplated that
After the photovoltaic cell of micro-capacitance sensor and the isolated island detection function of energy-storage battery, the present invention proposes one kind and is adapted to the micro- electricity of user side
The multiple spot isolated island detection technique of net, detection speed fast advantage small with check frequency, is conducive to the safe and stable of micro-capacitance sensor
And economical operation.
The content of the invention
The present invention is to carry out theory analysis based on the isolated island detection technique to micro-capacitance sensor, and model is built using PSCAD softwares
Simulating, verifying is carried out there is provided a kind of multiple spot isolated island detection technique for being adapted to user side micro-capacitance sensor, the safe, steady of micro-capacitance sensor is ensured
Fixed and economical operation.
The purpose of the present invention is achieved through the following technical solutions.
Suitable for the island detection method of user side micro-capacitance sensor, comprise the following steps：
The power supply for being directly accessed 380V bus bar sides is classified as A classes, the power supply of the sub- micro-capacitance sensor of family is classified as B classes；
The isolated island alarm signal that each power supply is sent is received by central controller；
The isolated island alarm signal for first determining whether that A class power supplys are sent after isolated island alarm signal is received, if A class power supplys
Then show that floor power distribution network breaks down, user side micro-capacitance sensor integrally breaks down；
It is on the contrary, it is determined that sub- micro-capacitance sensor where occurring the B class power supplys of isolated island failure, the power supply is to occur unplanned property orphan
The sub- micro-capacitance sensor of family on island.
Further, there is two kinds of island effect in user side micro-capacitance sensor, and one is that user side micro-capacitance sensor is integrally formed
Isolated island；Two be the sub- micro-capacitance sensor formation isolated island of part family inside user side micro-capacitance sensor.
Further, the power supply inside user side micro-capacitance sensor includes photovoltaic cell and energy-storage battery, the two types power supply
It is connected by current transformer with power distribution network.
Further, the current transformer being connected with photovoltaic cell has isolated island detection function to meet national standard, and can be by
Isolated island alarm signal is sent to central controller；
The current transformer being connected with energy-storage battery may be free of isolated island detection function, it is therefore desirable to not contain isolated island in view of it
Detect the situation of function.
Further, the situation of isolated island detection function may not be contained according to the current transformer being connected with energy-storage battery, respectively
Formulate corresponding isolated island detection scheme；If detecting function containing isolated island, when isolated island occurs, the isolated island alarm signal sent is delivered to
Central controller, so that it is determined that the particular location that isolated island occurs；If detecting function without isolated island, it may be sent out firstly the need of to isolated island
Raw position is numbered, and when isolated island occurs, isolated island alarm signal will reach central controller, first determine whether A class power supplys whether there is
Send isolated island alarm signal, isolated island be integrally formed if having and can be identified as user side micro-capacitance sensor, if without if according to sending isolated island report
The B class power supply numbers of alert signal position the isolated island generation area；So as to which the particular location occurred according to isolated island formulates corresponding micro-
Operation of power networks control strategy, it is ensured that the safe and stable and economical operation of micro-capacitance sensor.
The present invention compared with prior art, has the following advantages that and technique effect：Check frequency of the present invention is small, detection speed
It hurry up, be conducive to the safe and stable and economical operation of micro-capacitance sensor.
Brief description of the drawings
Fig. 1 is user side micro-capacitance sensor isolated island detection algorithm flow chart.
Fig. 2 is the user side micro-capacitance sensor islet operation analogous diagram that the sub- microgrid of power supply and family carries isolated island detection function.
Fig. 3 is the sub- piconet island operation analogous diagram of family of the sub- microgrid of power supply and family with isolated island detection function.
Fig. 4 is that the current transformer being connected with energy-storage battery is imitated without the user side micro-capacitance sensor islet operation of isolated island detection function
True figure.
Fig. 5 is that the current transformer being connected with energy-storage battery is emulated without the sub- piconet island operation of family of isolated island detection function
Figure.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is done and further described in detail, but the implementation of the present invention is not limited to this, needs
If being that those skilled in the art can refer to prior art, it is noted that having the process not described in detail especially or symbol below
Realize or understand.
Fig. 1 is user side micro-capacitance sensor isolated island detection algorithm flow chart.
Known by Fig. 1, the method for micro-capacitance sensor multiple spot isolated island detection is as follows：
（1）After isolated island alarm signal is received, first determine whether A class power supplys whether there is and send isolated island alarm signal, if control
Device receives the isolated island alarm signal of A class power supplys, then judges that isolated island is integrally formed in user side micro-capacitance sensor, outside floor matches somebody with somebody electrical equivalent
Power network breaks down；If being not received by the isolated island alarm signal of A class power supplys, it is transferred to (2).
（2）In the case where being not received by A class generator islanding alarm signals, judge whether to receive the orphan of B class power supplys
Island alarm signal, if receiving the isolated island alarm signal of B class power supplys, according to the B class power supply numbers for sending isolated island alarm signal
Position the isolated island region；If being not received by the isolated island alarm signal of B class power supplys, illustrate that now user side micro-capacitance sensor is not sent out
Raw isolated island.
In this analogue system, user side micro-capacitance sensor mainly includes photovoltaic cell, energy-storage battery, current transformer and load.
Wherein A classes power supply is the energy-storage battery and photovoltaic cell for being directly accessed 380V buses, with two kinds of user side micro-capacitance sensor
The connected current transformer of type of power detects function to meet national standard with isolated island, and can deliver to isolated island alarm signal
Entreat controller；B classes power distribution is in the sub- microgrid 2 of the sub- microgrid 1 of family and family, and the sub- microgrid 1 of family includes photovoltaic cell, unsteady flow
Device and user, the current transformer being connected with photovoltaic cell have isolated island detection function, and the sub- microgrid 2 of family includes energy-storage battery, unsteady flow
Device and user, the current transformer being connected with energy-storage battery may be comprising isolated island detection functions or not comprising isolated island detection function.Below
Following two situations are emulated.
When Fig. 2 is that the sub- microgrid of power supply and family detects function with isolated island, the equivalent power network of floor distribution breaks down, and uses
Simulation result during the micro-capacitance sensor islet operation of family side.
Known by Fig. 2, when the time is 3s, the equivalent power network of floor distribution breaks down, and causes system voltage to fall, A classes electricity
In source, coupled current transformer detects function with isolated island, and isolated island alarm signal can be delivered into central controller, passes through
After A classes power detecting occurs to failure, upward layer managing system is sent isolated island alarm signal by power supply, and tension management system is received
To after isolated island alarm signal, grid-connected switch is disconnected, instruction is sent, the control strategy in A class power supplys is changed into voltage-frequency conversion
Control, as the main power source of whole user side micro-capacitance sensor, under the adjustment of energy-storage battery, the voltage and frequency of whole micro-capacitance sensor are extensive
It is multiple normal, whole system isolated island stable operation.Isolated island categorical variable in Fig. 2 is 4, be can determine whether out as A class generator islandings（Isolated island
It is A class generator islandings when type is 4；It is the sub- isolated island of microgrid 1 of family in B class power supplys when isolated island type is 2；Isolated island type is
It is the sub- isolated island of microgrid 2 of family in B class power supplys when 1；It is the sub- microgrid 1 of family in B class power supplys and family when isolated island type is 3
Sub- microgrid 2 all isolated islands）.
When Fig. 3 is that the sub- microgrid of power supply and family detects function with isolated island, the equivalent power network of floor distribution is normal, family's
Simulation result when piconet island is run.
Known by Fig. 3, in 3s, because failure causes family, sub- the grid-connected of microgrid 1 switches off, due in sub- microgrid 1 with
The connected current transformer of photovoltaic cell has isolated island detection function, detects sub- microgrid 1 islet operation, due to now sub- microgrid 1
In there is no power supply to provide voltage and frequency to sub- microgrid 2 to support, in order to protect the photovoltaic in sub- micro-grid system safety, sub- microgrid 1
Battery will be out of service immediately, and now the value of isolated island type is 2.Exit that to have no effect on whole user side micro- due to sub- microgrid 2
The operation of power network, the voltage and frequency of whole microgrid are still determined by bulk power grid.In 4s, because failure causes family, son is micro-
The grid-connected switch of net 2 also disconnects, and due to containing energy-storage battery in the sub- microgrid 2 of family, the current transformer being attached thereto has isolated island inspection
Survey ability, can detect the generation of the sub- isolated island of microgrid 2, and tension management system is received after isolated island alarm signal, will send finger
Order, makes energy-storage battery in sub- microgrid 2 by voltage-frequency conversion mode operation, be the sub- microgrid 2 of family provide stable frequency and
Voltage support, now the value of isolated island type be changed into 3 from 2, reflected the isolated island situation of system.
The current transformer being connected with energy-storage battery may be free of isolated island detection function, and now central controller can not receive this
The isolated island alarm signal of sub- micro-capacitance sensor, it is impossible to judge whether sub- micro-capacitance sensor occurs unplanned property isolated island, it is impossible to take science in time
Rational control strategy, it is therefore necessary to for the sub- microgrid design isolated island detection scheme of family of the only power supply containing the type.
Fig. 4 is that the equivalent power network of floor distribution breaks down, simulation result during user side micro-capacitance sensor islet operation.It is now electric
There is the sub- microgrid 1 in source and family isolated island to detect function, and the sub- microgrid 2 of family detects function without isolated island.
Known by Fig. 4, when the time is 3s, the equivalent power network of floor distribution breaks down, and causes system voltage to fall, A classes electricity
In source, current transformer is detected after failure generation, and upward layer managing system sends isolated island alarm signal, and tension management system is received
After isolated island alarm signal, grid-connected switch is disconnected, instruction is sent, the energy-storage battery in A class power supplys is run by electric voltage frequency mode,
Voltage and frequency support, under the adjustment of energy-storage battery, the voltage and frequency of whole micro-capacitance sensor are provided for whole user side micro-capacitance sensor
Rate recovers normal, whole system isolated island stable operation.After isolated island generation, isolated island categorical variable value is changed into 4, it follows that this
When have A class generator islandings.
Fig. 5 is that the equivalent power network of floor distribution breaks down, imitative when the sub- piconet island of family is run in user side micro-capacitance sensor
True result.Now there is the sub- microgrid 1 of power supply and family isolated island to detect function, and the sub- microgrid 2 of family detects function without isolated island.
In 3s, the sub- microgrid 1 of family is grid-connected to be switched off, during 4s, and the sub- microgrid 2 of family is grid-connected to be switched off.In sub- microgrid
1 it is grid-connected switch off after, the current transformer being connected with photovoltaic cell in family's subnet 1 detects isolated island alarm signal, sends orphan
Island alarm signal, photovoltaic cell is out of service, and now isolated island type, which is known, is changed into 2.In 4s, the grid-connected switch of the sub- microgrid 2 of family is disconnected
Open, the current transformer being connected with photovoltaic cell detects isolated island, send isolated island alarm signal, energy-storage battery is started working, and is family
Sub- microgrid 2 provides voltage and frequency support, and now isolated island types value is changed into 3 from 2.Therefore it can be recognized by isolated island types value
Whether system has isolated island, when isolated island occurs, can also be recognized by isolated island types value and there occurs which type of orphan
Island.
Claims (2)
1. suitable for the island detection method of user side micro-capacitance sensor, it is characterised in that comprise the following steps：
The power supply for being directly accessed 380V bus bar sides is classified as A classes, the power supply of the sub- micro-capacitance sensor of family is classified as B classes；
The isolated island alarm signal that each power supply is sent is received by central controller；
The isolated island alarm signal for first determining whether that A class power supplys are sent after isolated island alarm signal is received, if A classes power supply then table
Bright floor power distribution network breaks down, and user side micro-capacitance sensor integrally breaks down；
It is on the contrary, it is determined that sub- micro-capacitance sensor where occurring the B class power supplys of isolated island failure, the power supply is to occur unplanned property isolated island
The sub- micro-capacitance sensor of family；Power supply inside user side micro-capacitance sensor includes photovoltaic cell and energy-storage battery, and the two types power supply leads to
Current transformer is crossed to be connected with power distribution network；
The current transformer being connected with photovoltaic cell has isolated island detection function to meet national standard, and can pass isolated island alarm signal
Deliver to central controller；
The current transformer being connected with energy-storage battery may be free of isolated island detection function, it is therefore desirable to isolated island detection is not contained in view of it
The situation of function；
The situation of isolated island detection function may not be contained according to the current transformer being connected with energy-storage battery, corresponding isolated island is formulated respectively
Detection scheme；If detecting function containing isolated island, when isolated island occurs, the isolated island alarm signal sent is delivered into central controller, from
And determine the particular location that isolated island occurs；If detecting function without isolated island, carried out firstly the need of the position that isolated island may occur
Numbering, when isolated island occurs, isolated island alarm signal will reach central controller, first determine whether A class power supplys whether there is and send isolated island alarm
Signal, isolated island is integrally formed if having and can be identified as user side micro-capacitance sensor, if electric according to the B classes for sending isolated island alarm signal without if
Source numbering positions the isolated island generation area；So as to which the particular location occurred according to isolated island formulates corresponding micro-capacitance sensor operation control plan
Slightly.
2. a kind of island detection method suitable for user side micro-capacitance sensor according to claim 1, it is characterised in that：User
There is two kinds of island effect in side micro-capacitance sensor, one is that isolated island is integrally formed in user side micro-capacitance sensor；Two be user side micro-capacitance sensor
The sub- micro-capacitance sensor formation isolated island of internal part family.
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| CN112924813B (en) * | 2021-01-28 | 2022-09-16 | 国网浙江省电力有限公司绍兴供电公司 | Power distribution network short-circuit fault monitoring method and device based on electrical data |
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| US6603290B2 (en) * | 2001-11-26 | 2003-08-05 | Visteon Global Technologies, Inc. | Anti-islanding detection scheme for distributed power generation |
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Application publication date: 20150429 Assignee: Guangzhou Development Zone Yuedian new energy Co.,Ltd. Assignor: SOUTH CHINA University OF TECHNOLOGY Contract record no.: X2023980036273 Denomination of invention: A islanding detection method suitable for user side microgrids Granted publication date: 20171020 License type: Common License Record date: 20230615 |