CN111509689B - Ground fault full-compensation system and method for multiplexing parallel reactive compensation - Google Patents
Ground fault full-compensation system and method for multiplexing parallel reactive compensation Download PDFInfo
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- CN111509689B CN111509689B CN202010393316.7A CN202010393316A CN111509689B CN 111509689 B CN111509689 B CN 111509689B CN 202010393316 A CN202010393316 A CN 202010393316A CN 111509689 B CN111509689 B CN 111509689B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
- H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
- H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
In the ground fault full-compensation system and method for multiplexing parallel reactive compensation, the system is composed of a phase power supply converter, a multiplexing compensation device, a ground fault compensation switch, an injection transformer and a multiplexing controller, the multiplexing controller judges whether the system is in a normal operation state or a single-phase ground fault state according to collected signals, when the power system is in the normal operation state, the ground fault compensation switch is switched off, and the multiplexing compensation device performs reactive power compensation on the power system; when the single-phase earth fault occurs in the power system, the earth fault compensation switch is closed, the multiplexing compensation device stops reactive compensation, and the multiplexing compensation device and/or the injection transformer are/is adjusted to perform single-phase earth fault full compensation; the system performs reactive power compensation when the power system normally operates, performs earth fault current full compensation when the system has single-phase earth fault, works in a full life cycle, and improves the utilization rate of the single-phase earth compensation device.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a system and a method for ground fault full compensation of multiplexing parallel reactive compensation.
Background
The single-phase earth fault of the power distribution network at home and abroad accounts for more than 80 percent, the safe operation of the power grid and equipment is seriously influenced, and the safe processing of the earth fault plays an important role in social and economic development. When the capacitance current of the system is more than 10A, an arc suppression coil grounding mode is adopted. The arc suppression coil can reduce the fault current to a certain extent, and the system can take the trouble to operate for 2 hours, but the arc suppression coil can not realize full compensation, and the fault point still has the residual current that is less than 10A, and the existence of residual current can cause the person to electrocute, the conflagration accident to and threaten the safe and stable operation of electric wire netting and equipment seriously. When the capacitance current of the system is large, a small-resistance grounding mode is mostly adopted, when a single-phase grounding fault occurs, the zero sequence current of the fault line is amplified, and the relay protection device quickly cuts off the fault line.
Currently, in order to be able to thoroughly eliminate the single-phase earth fault hazard, the reliability of the power supply is ensured at the same time. Various methods for completely compensating the current of the single-phase earth fault point are proposed at home and abroad. The method mainly comprises the following steps: on one hand, the GFN (ground fault neutralizer) manufactured by Swedishneutral in Swedish is taken as a representative to realize the full compensation of the ground fault by using a power electronic active power supply, and the technical principle of a power distribution network ground fault arc extinction and protection method (CN 102074950A) in domestic patent also belongs to the active full compensation. On the other hand, the inventor of the present invention provides a system and a method for compensating a ground fault current of a self-generated phase power supply, which utilize a phase power supply converter, and have significant advantages in terms of cost and stability due to the absence of a power electronic power supply.
However, the normal operation time of the power system far exceeds the duration of the single-phase earth fault, and no matter the arc suppression coil, the active mode earth fault full compensation or the self-generated power supply mode earth fault full compensation, the power system does not contribute to the normal operation process of the system in most of the operation time of the power system; the single-phase grounding compensation device is high in value, and if the single-phase grounding compensation device is in an idle state in most of time, the single-phase grounding compensation device is not fully utilized, and the single-phase grounding compensation device is a serious waste of equipment resources of a power system.
Disclosure of Invention
The application provides a system and a method for fully compensating earth faults by multiplexing parallel reactive compensation, which aim to solve the technical problem of low utilization rate of a single-phase earth compensation device.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
in a first aspect, the present application provides a ground fault full compensation system for multiplexing parallel reactive compensation, the system includes a phase power supply converter, a multiplexing compensation device, a ground fault compensation switch, an injection transformer, and a multiplexing controller, wherein:
one side of the phase power supply converter is connected with a power system bus, and the other side of the phase power supply converter is connected with the multiplexing compensation device;
the multiplexing compensation device is grounded, one end of the multiplexing compensation device is connected with the phase power supply converter, and the other end of the multiplexing compensation device is connected with the ground fault compensation switch;
one end of the ground fault compensation switch is connected with the multiplexing compensation device, and the other end of the ground fault compensation switch is connected with the injection transformer;
the other end of the injection transformer is respectively connected with a neutral point of a power system and the ground;
the multiplexing controller is connected with the multiplexing compensation device, the ground fault compensation switch and the injection transformer.
Optionally, the system includes a phase power supply converter, a multiplexing compensation device, a ground fault compensation switch, and a multiplexing controller, where:
one side of the phase power supply converter is connected with a power system bus, and the other side of the phase power supply converter is connected with the multiplexing compensation device;
one end of the multiplexing compensation device is connected with the phase power supply converter, and the other end of the multiplexing compensation device is connected with the ground fault compensation switch;
one end of the ground fault compensation switch is connected with the multiplexing compensation device, and the other end of the ground fault compensation switch is connected with a neutral point of the power system;
the multiplexing controller is connected with the multiplexing compensation device and the ground fault compensation switch).
Optionally, the multiplexing controller includes:
the system signal acquisition module is used for acquiring bus voltage, bus load current, line current, multiplexing compensation device voltage and multiplexing compensation device current signals of the power system;
the system state judging and switching module is used for judging whether the power system is in a normal operation state or a single-phase earth fault state according to the signal acquired by the system signal acquisition module and controlling the earth fault compensation switch;
the reactive compensation control module is used for controlling the multiplexing compensation device to output reactive power required by the power system according to the signal acquired by the system signal acquisition module;
and the ground fault full-compensation control module is used for controlling the transformation ratio of the injection transformer to adjust the compensation voltage and the compensation current during single-phase grounding according to the signal acquired by the system signal acquisition module.
Optionally, the multiplexing controller further includes a protection module, configured to isolate a system fault when a fault such as a short circuit or an overload occurs.
Optionally, the phase power supply converter is a transformer or a combination of transformers;
the phase power supply converter is used for providing a reactive compensation channel isolated from a power system;
the phase power supply converter is also used for converting the system line voltage into a phase voltage opposite to the system phase power supply to serve as a compensation power supply of single-phase grounding full compensation.
Optionally, the multiplexing compensation device adopts a star connection mode.
Optionally, the ground fault compensation switch is a combination of three single-phase switches.
Optionally, the injection transformer is a single-phase transformation ratio adjustable transformer.
Optionally, the neutral point of the power system is a system neutral point led out by a grounding transformer, a system neutral point led out by a main transformer of the power system, or a system neutral point led out by the phase power supply converter.
In a second aspect, the present application further provides a ground fault full compensation method for multiplexing parallel reactive compensation, where the method includes:
judging the running state of the system;
when the single-phase earth fault does not occur in the power system, the earth fault compensation switch is switched off, and the multiplexing compensation device carries out reactive power compensation on the power system;
when the single-phase earth fault occurs in the power system, the earth phase is judged, the earth corresponding switch of the earth fault compensation switch is closed, and the multiplexing compensation device and/or the injection transformer are adjusted to perform single-phase earth fault full compensation;
and judging whether the single-phase earth fault disappears, if so, disconnecting the earth fault compensation switch, performing reactive power compensation on the power system by using the multiplexing compensation device, and if not, continuing to perform single-phase earth fault full compensation.
Compared with the prior art, the beneficial effects of this application do:
according to the technical scheme, the system comprises a phase power supply converter, a multiplexing compensation device, a ground fault compensation switch, an injection transformer and a multiplexing controller, wherein the multiplexing controller judges whether the system is in a normal operation state or a single-phase ground fault state according to collected signals; when the single-phase earth fault occurs in the power system, the earth phase is judged, the earth corresponding switch of the earth fault compensation switch is closed, and the multiplexing compensation device and/or the injection transformer are adjusted to perform single-phase earth fault full compensation; the system performs reactive power compensation when the power system normally operates, performs earth fault current full compensation when the system has single-phase earth fault, works in a full life cycle, and improves the utilization rate of the single-phase earth compensation device.
The system and the method for the ground fault full compensation of the multiplex parallel reactive compensation improve the utilization rate of the ground fault full compensation device, realize the full life cycle application of the device and increase the value of the assets of the power system; compared with the current two sets of systems of reactive compensation and single-phase grounding full compensation, the intensive multiplexing parallel reactive compensation grounding fault full compensation system has the advantages of greatly reduced volume, convenient deployment and implementation and lower comprehensive cost.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments are briefly described below, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a ground fault full compensation system for multiplexing parallel reactive compensation according to an embodiment of the present application;
fig. 2 is another schematic structural diagram of a ground fault full compensation system for multiplexing parallel reactive compensation according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a multiplexing controller of a ground fault full compensation system for multiplexing parallel reactive compensation according to an embodiment of the present application;
fig. 4 is one specific implementation of the ground fault full compensation system for multiplexing parallel reactive compensation according to the embodiment of the present application;
fig. 5 is a second specific implementation of the ground fault full compensation system for multiplexing parallel reactive compensation according to the embodiment of the present application;
fig. 6 is a third specific implementation of a ground fault full compensation system for multiplexing parallel reactive compensation according to an embodiment of the present application;
fig. 7 is a schematic flowchart of a method for fully compensating for a ground fault by multiplexing parallel reactive compensation according to an embodiment of the present application.
The system comprises a 1-phase power supply converter, a 2-multiplexing compensation device, a 3-ground fault compensation switch, a 4-injection transformer, a 5-multiplexing controller, a 51-system signal acquisition module, a 52-system state judgment and switching module, a 53-reactive compensation control module, a 54-ground fault full compensation control module and a 55-protection module.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.
The application provides a multiplexing parallel reactive compensation ground fault full compensation system, as shown in fig. 1, comprising a phase power supply converter 1, a multiplexing compensation device 2, a ground fault compensation switch 3, an injection transformer 4 and a multiplexing controller 5.
One side of a phase power supply converter 1 is connected with a power grid system bus, and the other side of the phase power supply converter is connected with a multiplexing compensation device 2 and a ground fault compensation switch 3;
one end of the ground fault compensation switch 3 is connected with the multiplexing compensation device 2 and the phase power supply converter 1, and the other end is connected with the injection transformer 4. The other end of the injection transformer 4 is connected with a neutral point of the power system;
the multiplexing controller 5 is connected to the multiplexing compensation device 2, the ground fault compensation switch 3, and the injection transformer 4, and controls the operation thereof.
Wherein, injection transformer 4 is optional module, and when not selecting for use injection transformer 4, ground fault compensation switch 3 one end is connected with multiplexing compensation arrangement 2 and looks power supply converter 1, and the other end is connected with electric power system neutral point, and the system is like figure 2 this moment, specifically for the system includes looks power supply converter 1, multiplexing compensation arrangement 2, ground fault compensation switch 3, multiplexing controller 5, wherein:
one side of the phase power supply converter 1 is connected with a power system bus, and the other side of the phase power supply converter is connected with the multiplexing compensation device 2;
one end of the multiplexing compensation device 2 is connected with the phase power supply converter 1, and the other end is connected with the ground fault compensation switch 3;
one end of the ground fault compensation switch 3 is connected with the multiplexing compensation device 2, and the other end of the ground fault compensation switch is connected with a neutral point of the power system;
the multiplexing controller 5 is connected to the multiplexing compensation device 2 and the ground fault compensation switch 3.
As shown in fig. 3, the multiplexing controller 5 includes: the system comprises a system signal acquisition module 51, a system state judging and switching module 52, a reactive power compensation control module 53, a ground fault full compensation control module 54 and a protection module 55.
The system signal acquisition module 51 acquires signals such as bus voltage, bus load current, line current, multiplexing compensation device voltage, multiplexing compensation device current and the like of the power system; the system state judging and switching module 52 judges whether the power system is in a normal operation state or a single-phase earth fault state according to the signal collected by the system signal collecting module 51, and controls the earth fault compensation switch 3; the reactive compensation control module 53 controls the multiplexing compensation device 2 to compensate the reactive power and the harmonic wave required by the power system according to the signal collected by the system signal collection module 51; the ground fault full compensation control module 54 controls the multiplexing compensation device 2 and/or the injection transformer 4 to adjust the compensation voltage and the compensation current during single-phase grounding according to the signal acquired by the system signal acquisition module 51. The protection module 55 judges the working state of the system according to the signals collected by the system signal collection module 51, isolates the system fault when faults such as short circuit, overload and the like occur, and ensures that the normal operation of the power system is not influenced by the system fault.
The phase power supply converter 1 is a transformer or a combination of transformers, and the transformer can be an electromagnetic transformer or an electronic transformer or other types of transformers; the phase power supply converter 1 provides a reactive compensation channel isolated from a power system; the phase power supply converter 1 also converts the system line voltage into a phase voltage opposite to the system phase power supply, and provides a compensation power supply with single-phase grounding full compensation. The capacity of the phase power supply converter 1 is: the maximum single-phase earth compensation capacity of the target power system is added with the maximum reactive compensation capacity required by the target power system, and 10% -50% of margin is set.
The multiplexing compensation device 2 can be any reactive compensation device structure mode, including but not limited to a TCR mode, a TCT mode, a TSC mode, an SVG mode, a packet switched capacitor bank mode, and the like. The multiplexing compensation device 2 adopts a star connection mode in a TCR mode, a TCT mode, a TSC mode, an SVG mode, an APF grouping switching capacitor bank mode and the like, and a neutral point thereof is grounded. The capacity of the multiplexing compensation device 2 is the maximum reactive compensation capacity required by the target power system, and 10% -50% of margin is set.
The ground fault compensation switch 3 is a combination of three single-phase switches, and one end of the ground fault compensation switch is connected with each phase of the phase power supply converter 1; when the injection transformer 4 is selected, the other end of the ground fault compensation switch 3 is in short circuit and is connected to one side of the injection transformer 4; when the injection transformer 4 is not selected, the other end of the ground fault compensation switch 3 is short-circuited and connected to a system neutral point. The ground fault compensation switch 3 can adopt a mechanical switch or an electronic switch or other switches.
The injection transformer 4 is a single-phase transformer. The injection transformer 4 may be an electromagnetic transformer or a power electronic transformer or other transformers. The injection transformer 4 may be a variable ratio adjustable regulating transformer or a fixed ratio transformer. The capacity of the injection transformer 4 is based on the maximum single-phase grounding compensation capacity of the target power system, and 10% -50% of allowance is set.
The power system neutral point can be a system neutral point led out by a grounding transformer or a system neutral point led out by a main transformer of the power system or a system neutral point led out by a phase power supply converter or other system neutral points.
In a second aspect, the present application further provides a method for fully compensating a ground fault by multiplexing parallel reactive compensation, where, as shown in fig. 7, the method includes:
s110: judging the running state of the system;
s120: when the single-phase earth fault does not occur in the power system, the earth fault compensation switch is switched off, and the multiplexing compensation device carries out reactive power compensation on the power system;
s130: when the single-phase earth fault occurs in the power system, the earth phase is judged, the earth corresponding switch of the earth fault compensation switch is closed, and the multiplexing compensation device and/or the injection transformer are adjusted to perform single-phase earth fault full compensation;
s140: judging whether the single-phase earth fault disappears;
s150: if yes, disconnecting the ground fault compensation switch, and performing reactive power compensation on the power system by the multiplexing compensation device;
s160: if not, the single-phase earth fault full compensation is continued.
According to the technical scheme, the system comprises a phase power supply converter, a multiplexing compensation device, a ground fault compensation switch, an injection transformer and a multiplexing controller, wherein the multiplexing controller judges whether the system is in a normal operation state or a single-phase ground fault state according to collected signals; when the single-phase earth fault occurs in the power system, the earth phase is judged, the earth corresponding switch of the earth fault compensation switch is closed, and the multiplexing compensation device and/or the injection transformer are adjusted to perform single-phase earth fault full compensation; the system performs reactive power compensation when the power system normally operates, performs earth fault current full compensation when the system has single-phase earth fault, works in a full life cycle, and improves the utilization rate of the single-phase earth compensation device.
Referring to fig. 4, a specific embodiment of a system for full compensation of ground fault with multiplexing parallel reactive compensation according to the present invention is shown, in this embodiment, a target power system is a 10kV neutral point ungrounded system. The phase power supply converter 1 adopts a three-phase transformer with 10kV/0.4kV, 2.2MVA and Yyn6 connection group, one side of the three-phase transformer is connected with a system bus, the other side of the three-phase transformer is connected with a multiplexing compensation device, and a neutral point at the side is grounded. The multiplexing compensation device 2 adopts a TCR reactive compensation device of 0.4kV/2MVA, adopts a star connection mode and is grounded at a neutral point. The earth fault compensation switch 3 adopts three single-phase circuit breakers, one ends of the three single-phase circuit breakers are respectively connected with the phase power supply converter and the multiplexing compensation device, and the other ends of the three single-phase circuit breakers are in short circuit and connected with the injection transformer 4. The injection transformer 4 adopts a single-phase voltage-regulating transformer with 0.4kV/5.7kV, adjustable +/-20 percent and 0.2MVA capacity, one side of the voltage-regulating transformer is respectively connected with the ground fault compensation switch 3 and the ground, and the other side of the voltage-regulating transformer is respectively connected with a system neutral point and the ground. The multiplexing controller 5 controls the multiplexing compensation device 2 to dynamically compensate the reactive power and harmonic of the power grid system when the system normally operates, so that the requirements of the reactive power and the harmonic of the power grid system are met; when the system has single-phase earth fault, the earth phase is judged, the corresponding switch of the earth fault compensation switch 3 is closed, and the inductance and/or the transformation ratio of the injection transformer 4 input by the earth fault phase of the multiplexing compensation device 2 are adjusted to realize the earth fault full compensation.
Referring to fig. 5, a second embodiment of the full ground fault compensation system for multiplexing parallel reactive compensation according to the present invention is shown, in which in this embodiment, the target power system is a 10kV neutral point ungrounded system. The phase power supply converter 1 adopts a combination of a 10kV/10kV, a 2.2MVA capacity Dyn7 three-phase transformer and a 10kV/10kV capacity, a 2.2MVA capacity and a Dyn11 three-phase transformer, one side of the combination is connected with a system bus, the other side of the combination is connected with a multiplexing compensation device, and the neutral point of the Dyn11 transformer is grounded. The multiplexing compensation device 2 adopts a TSC reactive compensation device of 10kV/2MVA, adopts a star connection mode, and is grounded at a neutral point. The earth fault compensation switch 3 adopts three single-phase circuit breakers, one ends of the three single-phase circuit breakers are respectively connected with the phase power supply converter and the multiplexing compensation device, and the other ends of the three single-phase circuit breakers are in short circuit and connected with the injection transformer 4. The injection transformer 4 adopts a single-phase voltage regulating transformer with 5.7kV/5.7kV, adjustable +/-20 percent and 0.2MVA capacity, one side of the single-phase voltage regulating transformer is respectively connected with the ground fault compensation switch 3 and the ground, and the other side of the single-phase voltage regulating transformer is respectively connected with a system neutral point and the ground. The multiplexing controller 5 controls the multiplexing compensation device 2 to dynamically compensate the reactive power and harmonic of the power grid system when the system normally operates, so that the requirements of the reactive power and the harmonic of the power grid system are met; when the system has single-phase earth fault, the earth phase is judged, the corresponding switch of the earth fault compensation switch 3 is closed, and the capacitance reactance and/or the transformation ratio of the injection transformer 4 input by the earth fault phase of the multiplexing compensation device 2 are adjusted to realize the earth fault full compensation.
Referring to fig. 6, a third embodiment of a system for full compensation of ground fault with multiplexing parallel reactive compensation according to the present invention is shown, in this embodiment, a target power system is a 10kV neutral point ungrounded system. The phase power supply converter 1 adopts a three-phase transformer with 10kV/10kV, 2.2MVA and Yyn6 connection group, one side of the three-phase transformer is connected with a system bus, the other side of the three-phase transformer is connected with a multiplexing compensation device, and a neutral point of the side is grounded. Multiplexing compensation arrangement 2 adopts 10kV/2 MVA's SVG reactive power compensator, and compensation arrangement adopts the chain structure, and compensation module adopts the star connection mode, and neutral point ground connection. The earth fault compensation switch 3 adopts three single-phase circuit breakers, one ends of the three single-phase circuit breakers are respectively connected with the phase power supply converter 1 and the multiplexing compensation device 2, and the other ends of the three single-phase circuit breakers are in short circuit and connected with the injection transformation 4. The injection transformer 4 adopts a single-phase voltage regulating transformer with 5.7kV/5.7kV, adjustable +/-20 percent and 0.2MVA capacity, one side of the single-phase voltage regulating transformer is respectively connected with the ground fault compensation switch and the ground, and the other side of the single-phase voltage regulating transformer is respectively connected with a system neutral point and the ground. The multiplexing controller 5 controls the multiplexing compensation device 2 to dynamically compensate the reactive power and harmonic wave of the power grid system when the system normally operates, so as to meet the requirements of the reactive power and harmonic wave of the power grid system; when the system has single-phase earth fault, the earth phase is judged, the corresponding switch of the earth fault compensation switch 3 is closed, and the earth fault phase output voltage of the multiplexing compensation device 2 and/or the transformation ratio of the injection transformer 4 are/is adjusted to realize the earth fault full compensation.
In conclusion, the system and the method for the ground fault full compensation of the multiplex parallel reactive compensation improve the utilization rate of the ground fault full compensation device, realize the full life cycle application of the device and increase the value of the assets of the power system; compared with the current two sets of systems of reactive compensation and single-phase grounding full compensation, the intensive multiplexing parallel reactive compensation grounding fault full compensation system has the advantages of greatly reduced volume, convenient deployment and implementation and lower comprehensive cost.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (8)
1. A ground fault full compensation system for multiplexing parallel reactive compensation, the system comprising a phase power supply converter (1), a multiplexing compensation device (2), a ground fault compensation switch (3), an injection transformer (4) and a multiplexing controller (5), wherein:
the phase power supply converter (1) is used for converting a system line voltage into a phase voltage opposite to a system phase power supply to serve as a compensation power supply of single-phase grounding full compensation;
the multiplexing compensation device (2) is a reactive compensation device and comprises any one of a TCR mode, a TCT mode, a TSC mode, an SVG mode and a grouping switched capacitor bank mode;
one side of the phase power supply converter (1) is connected with a power system bus, and the other side of the phase power supply converter is connected with the multiplexing compensation device (2);
the multiplexing compensation device (2) is grounded;
one end of the multiplexing compensation device (2) is connected with the phase power supply converter (1), and the other end of the multiplexing compensation device is connected with the ground fault compensation switch (3);
one end of the ground fault compensation switch (3) is connected with the multiplexing compensation device (2), and the other end of the ground fault compensation switch is connected with the injection transformer (4);
the other end of the injection transformer (4) is connected with a neutral point of a power system and the ground respectively;
the multiplexing controller (5) is connected with the multiplexing compensation device (2), the ground fault compensation switch (3) and the injection transformer (4) and is used for judging the running state of the system;
the multiplexing controller (5) comprises:
the system signal acquisition module (51) is used for acquiring bus voltage, bus load current, line current, multiplexing compensation device voltage and multiplexing compensation device current signals of the power system;
the system state judging and switching module (52) is used for judging whether the power system is in a normal operation state or a single-phase earth fault state according to the signal acquired by the system signal acquisition module (51) and controlling the earth fault compensation switch (3);
the reactive compensation control module (53) is used for controlling the multiplexing compensation device (2) to output reactive power required by the power system according to the signal acquired by the system signal acquisition module (51);
and the ground fault full compensation control module (54) is used for controlling the transformation ratio of the injection transformer (4) to adjust the compensation voltage and the compensation current during single-phase grounding according to the signal acquired by the system signal acquisition module (51).
2. The system for ground fault full compensation of multiplexed parallel reactive compensation according to claim 1, wherein the multiplexing controller (5) further comprises a protection module (55) for isolating system faults in case of short circuit, overload faults.
3. The system for ground fault full compensation with multiplexing parallel reactive compensation according to claim 1, characterized in that the phase power supply converter (1) is a transformer or a combination of transformers;
the phase power supply converter (1) is used for providing a reactive compensation channel isolated from a power system.
4. The system for ground fault full compensation of multiplexing parallel reactive compensation according to claim 1, characterized in that the multiplexing compensation device (2) adopts a star connection mode.
5. The system for ground fault full compensation of multiplexed parallel reactive compensation according to claim 1, characterized in that the ground fault compensation switch (3) is a combination of three single phase switches.
6. The system for ground fault full compensation of multiplexed parallel reactive compensation according to claim 1, characterized in that the injection transformer (4) is a single-phase transformer ratio adjustable transformer.
7. The system for ground fault full compensation with multiplexed parallel reactive compensation according to claim 1, wherein the power system neutral point is a system neutral point led out by a grounding transformer, a system neutral point led out by a main transformer of a power system, or a system neutral point led out by the phase power supply converter (1).
8. A method for multiplexing ground fault full compensation of parallel reactive compensation, the method comprising the steps of:
judging the running state of the system;
when the single-phase earth fault does not occur in the power system, the earth fault compensation switch is switched off, and the multiplexing compensation device carries out reactive power compensation on the power system;
when the power system has single-phase earth fault, judging the earth phase, closing the corresponding switch of the earth fault compensation switch, and adjusting the multiplexing compensation device and the injection transformer to perform single-phase earth fault full compensation;
and judging whether the single-phase earth fault disappears, if so, disconnecting the earth fault compensation switch, and performing reactive power compensation on the power system by the multiplexing compensation device, and if not, continuing to perform single-phase earth fault full compensation.
Priority Applications (1)
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