CN111509691B - Ground fault full-compensation topology for multiplexing reactive compensation and design method thereof - Google Patents
Ground fault full-compensation topology for multiplexing reactive compensation and design method thereof Download PDFInfo
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- CN111509691B CN111509691B CN202010394119.7A CN202010394119A CN111509691B CN 111509691 B CN111509691 B CN 111509691B CN 202010394119 A CN202010394119 A CN 202010394119A CN 111509691 B CN111509691 B CN 111509691B
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
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- 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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The multiplex reactive compensation ground fault full compensation topology and the design method thereof comprise a multiplex compensation transformer, a reactive compensation switch, a reactive compensation device, a ground fault compensation switch, an injection transformer, a harmonic wave and voltage regulation module and a multiplex controller, wherein the multiplex controller judges the state of a system according to collected signals and switches different compensation modes according to the state; and the reactive power compensation and the earth fault current compensation loop are independent, and the fluctuation of the reactive power compensation system part can not be caused during the earth fault compensation, so that the problems of the reactive power oscillation and the voltage stability of the system can not be caused.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a ground fault full-compensation topology for multiplexing reactive compensation and a design method thereof.
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, the system can operate for 2 hours with faults, but the arc suppression coil can not realize full compensation, residual current smaller than 10A still exists at a fault point, the residual current can cause personal electric shock and fire accidents, and the safe and stable operation of a power grid and equipment is seriously threatened. 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 a fault line is amplified, and the relay protection device quickly removes the fault line.
Currently, in order to be able to thoroughly eliminate the single-phase earth fault hazard, the reliability of power supply is guaranteed simultaneously. 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 method is represented by a GFN (ground fault neutralizer) manufactured by Swedishneutral in Sweden, realizes the full compensation of the ground fault by using a power electronic active power supply, and belongs to the active full compensation of the technical principle of a power distribution network ground fault arc extinction and protection method (CN102074950A) in domestic patent. 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 occurrence of the single-phase earth fault, and no matter the arc suppression coil, the active mode earth fault full compensation or the self-generating power supply mode earth fault full compensation, in most of the operation time of the power system, no contribution is made in the normal operation process of the 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.
In order to fully utilize the grounding compensation device, reduce the operation cost of a power grid and solve the problems of reactive power oscillation and voltage stability caused by changing the reactive power of a system when the reactive power compensation and the grounding fault compensation are simultaneously compensated, the invention provides a grounding fault full-compensation topology and a design method for multiplexing parallel reactive power compensation, and the grounding fault full-compensation topology and the design method have a reactive power compensation function, a harmonic wave treatment function and a single-phase grounding full-compensation function. On one hand, the ground fault full-compensation topology and the design method for multiplexing parallel reactive compensation can perform reactive compensation and harmonic suppression on a system when the system normally operates, and improve the quality of power supply and electric energy. On the other hand, when the system has single-phase earth fault, the complete compensation of the single-phase earth fault can be carried out, and the problems of reactive power oscillation and voltage stability are not caused. In addition, the system has highly-intensive functions, the whole system is small in size, only occupies the land area of one set of reactive compensation device, and has obvious advantages.
Disclosure of Invention
The application provides a ground fault full-compensation topology for multiplexing reactive compensation and a design method thereof, which aim to solve the technical problem of low utilization rate of a single-phase ground 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 topology for multiplexing reactive compensation, including a multiplexing compensation transformer, a reactive compensation switch, a reactive compensation device, a ground fault compensation switch, an injection transformer, a harmonic and voltage regulation module and a multiplexing controller, wherein:
one side of the multiplexing compensation transformer is connected with a power grid system bus, and the other side of the multiplexing compensation transformer is connected with the reactive power compensation switch and the ground fault compensation switch;
one side of the reactive compensation switch is connected with the multiplexing compensation transformer, and the other side of the reactive compensation switch is connected with the reactive compensation device;
one side of the ground fault compensation switch is connected with the multiplexing compensation transformer, the reactive compensation switch and the reactive compensation device, and the other side of the ground fault compensation switch is connected with the injection transformer and the harmonic and voltage regulation module;
one side of the injection transformer is connected with the ground fault compensation switch and the harmonic and voltage regulation module, and the other side of the injection transformer is connected with a system neutral point;
one side of the harmonic and voltage regulation module is connected with the injection transformer and the ground fault compensation switch, and the other side of the harmonic and voltage regulation module is grounded;
the multiplexing controller is connected to the ground fault compensation switch, the injection transformer and the harmonic and voltage regulation module.
Optionally, the multiplexing controller includes:
the system signal acquisition module is used for acquiring bus voltage, bus load current, line current, multiplexing compensation transformer voltage and multiplexing compensation transformer 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 signals collected by the system signal collecting module and controlling the earth fault compensation switch;
and the ground fault full-compensation control module is used for controlling the injection transformer and the harmonic wave and voltage regulation module to regulate the compensation voltage and the compensation current during single-phase grounding according to the signal collected by the system signal collection module.
And the protection module is used for isolating system faults when faults such as short circuit, overload and the like occur.
Optionally, the multiplexing compensation transformer is a transformer or a combination of transformers;
the multiplexing compensation transformer is used for providing series reactance for the reactive compensation device so as to inhibit system harmonic waves;
the multiplexing compensation transformer is also used for providing a reactive compensation channel isolated from the power system;
the multiplexing compensation transformer is also used for converting the system line voltage into a phase voltage opposite to the system phase power supply and serving as a compensation power supply for single-phase grounding full compensation.
Optionally, the reactive power compensation device is a three-phase capacitor bank or other reactive power compensation devices.
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 harmonic and voltage regulation module is a combination of a controllable capacitor and a controllable reactor;
the harmonic and voltage regulating module is used for filtering grounding harmonic waves and regulating grounding compensation voltage during grounding fault compensation.
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 multiplexing compensation transformer.
In a second aspect, the present application further provides a method for designing a ground fault full-compensation topology with multiplexing reactive compensation, where the method includes:
acquiring the capacity of a reactive power compensation device according to the reactive power planning of a target system and the current standard;
acquiring a grounding compensation capacity according to the capacitance current capacity of the target system;
acquiring the capacity of the multiplexing compensation transformer according to the capacity of the reactive compensation device and the grounding compensation capacity;
acquiring primary side equivalent leakage reactance of the multiplexing compensation transformer according to the rated line voltage of the target system and the capacity of the reactive power compensation device;
acquiring rated primary voltage of the injection transformer according to rated secondary voltage of the multiplexing compensation transformer;
acquiring a rated voltage ratio of the injection transformer according to the primary side equivalent leakage reactance of the multiplexing compensation transformer, the capacity of the reactive power compensation device and the rated secondary voltage of the multiplexing compensation transformer;
the capacity of the harmonic and voltage regulation module is 1% -20% of the capacity of the injection transformer.
Optionally, according to
Obtaining the equivalent leakage reactance X of the primary side of the multiplexing compensation transformer, wherein X is the equivalent leakage reactance X of the primary side of the multiplexing compensation transformer, K is the reactance rate, U is the rated line voltage of the target system, and Q C The capacity of the reactive power compensation device;
according to
Obtaining a rated primary voltage of the injection transformer, wherein U 21 Rated primary voltage, U, for the injection transformer 12 Rated secondary voltage for the multiplexing compensation transformer;
according to
Obtaining a rated voltage ratio of the injection transformer;
wherein n is the rated voltage ratio of the injection transformer, m is the rated voltage ratio of the multiplexing compensation transformer, Zc is the capacitance reactance of the current system to the ground distribution capacitance, and Z L Is an arc suppression coil inductive reactance, X is a primary side equivalent leakage reactance of the multiplexing transformer, X 2 For injecting into the primary side equivalent leakage reactance, Q, of the transformer C For the capacity, U, of the reactive power compensation means 12 Rated secondary voltage for said multiplying compensation transformer, Zc// Z L Denotes Zc and Z L The parallel impedance of (1).
Compared with the prior art, the beneficial effect of this application is:
according to the technical scheme, in the ground fault full-compensation topology and the design method thereof for multiplexing reactive compensation, a system multiplexes a compensation transformer, a reactive compensation switch, a reactive compensation device, a ground fault compensation switch, an injection transformer, a harmonic and voltage regulation module 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 has a single-phase ground fault, a ground phase is judged, the ground phase switch of the ground fault compensation switch is controlled to be closed, and the transformation ratio of the harmonic and voltage regulation module and/or the injection transformer is regulated to perform single-phase ground fault full compensation; judging whether the single-phase earth fault disappears, if so, disconnecting the earth fault compensation switch and stopping the full compensation of the single-phase earth fault; if not, continuing to perform single-phase earth fault full compensation; the system performs reactive power compensation and harmonic treatment 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.
Compared with the current two sets of systems of capacitor bank reactive compensation and single-phase grounding full compensation, the multiplexing reactive compensation ground fault full compensation topology and the design method thereof have the advantages of greatly reduced volume, convenient deployment and implementation and lower comprehensive cost; and the reactive power compensation and the earth fault current compensation loop are independent, and the fluctuation of the reactive power compensation system part can not be caused during the earth fault compensation, so that the problems of the reactive power oscillation and the voltage stability of the system can not be caused.
In conclusion, the micro-system voltage stabilizing device has the advantages of high equipment utilization rate, intensive functions, small size, strong practicability and the like, and overcomes the problems of reactive oscillation and voltage stability of the micro-system.
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 will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a ground fault full compensation topology for multiplexing reactive compensation according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a multiplexing controller for multiplexing a reactive compensation ground fault full compensation topology according to an embodiment of the present application;
fig. 3 is a specific implementation of a ground fault full compensation topology for multiplexing reactive compensation according to an embodiment of the present application;
fig. 4 is a schematic flow chart of a design method of a ground fault full compensation topology for multiplexing reactive compensation according to an embodiment of the present application.
The system comprises a 1-multiplexing compensation transformer, a 2-reactive compensation switch, a 3-reactive compensation device, a 4-ground fault compensation switch, a 5-injection transformer, a 6-harmonic and voltage regulation module, a 7-multiplexing controller, a 71-system signal acquisition module, a 72-system state judgment and switching module, a 73-ground fault full compensation control module and a 74-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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In a first aspect, the present application provides a ground fault full compensation topology for multiplexing reactive compensation, as shown in fig. 1, including a multiplexing compensation transformer 1, a reactive compensation switch 2, a reactive compensation device 3, a ground fault compensation switch 4, an injection transformer 5, a harmonic and voltage regulation module 6, and a multiplexing controller 7, wherein:
one side of the multiplexing compensation transformer 1 is connected with a power grid system bus, and the other side of the multiplexing compensation transformer is connected with the reactive power compensation switch 2 and the ground fault compensation switch 4;
one side of the reactive compensation switch 2 is connected with the multiplexing compensation transformer 1, and the other side is connected with the reactive compensation device 3;
one side of the ground fault compensation switch 4 is connected with the multiplexing compensation transformer 1, the reactive compensation switch 2 and the reactive compensation device 3, and the other side is connected with the injection transformer 5 and the harmonic and voltage regulation module 6;
one side of an injection transformer 5 is connected with the ground fault compensation switch 4 and the harmonic and voltage regulation module 6, and the other side is connected with a system neutral point;
one side of the harmonic and voltage regulation module 6 is connected with the injection transformer 5 and the ground fault compensation switch 4, and the other side is grounded;
the multiplexing controller 7 is connected with the ground fault compensation switch 4, the injection transformer 5 and the harmonic and voltage regulation module 6;
the multiplexing compensation transformer 1 is a three-phase transformer or a combination of three-phase transformers, and the three-phase transformer can be an electromagnetic transformer or an electronic transformer or other types of transformers; the multiplexing compensation transformer 1 provides a reactive compensation device to provide a series reactance so as to limit the switching-on inrush current and suppress the system harmonic; the multiplexing compensation transformer 1 also provides a reactive compensation channel isolated from the power system; the multiplexing compensation transformer 1 also converts the system line voltage into a phase voltage which is opposite to or the same as the system phase power supply, and provides a compensation power supply with single-phase grounding full compensation.
The reactive compensation switch 2 is a three-phase switch, one end of which is connected with each phase of the multiplexing compensation transformer 1, and the other end of which is connected with the reactive compensation device 3. The reactive power compensation switch 2 can adopt a mechanical switch or an electronic switch or other switches, and aims to isolate the reactive power compensation device when the reactive power of the power system is excessive.
The reactive compensation device 3 is a three-phase capacitor bank or other reactive compensation devices (including active reactive compensation, passive reactive compensation, etc.) for compensating the reactive power required by the target system.
The ground fault compensation switch 4 is a combination of three single-phase switches, one end of the ground fault compensation switch is respectively connected with each phase between the multiplexing compensation transformer 1 and the reactive compensation switch 2, and the other end of the ground fault compensation switch is in short circuit and is connected to the injection transformer 5 and the harmonic wave and voltage regulation module 6. The ground fault compensation switch 4 may be a mechanical switch or an electronic switch or other type of switch.
The injection transformer 5 is a single-phase transformer. The injection transformer 5 may be an electromagnetic transformer or a power electronic transformer or other transformers. The injection transformer 5 adopts a variable ratio adjustable transformer.
The harmonic and voltage regulating module 6 is a combination of a controllable capacitor and a controllable reactor, and is used for filtering grounding harmonic and regulating grounding compensation voltage during ground fault compensation.
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.
The system provided by the application can perform single-phase grounding full compensation while performing reactive compensation and harmonic suppression, improves the utilization rate of the grounding fault full compensation device, realizes the full life cycle operation of the device, and increases the value of the asset of the power system; compared with the current two sets of systems of capacitor bank reactive compensation and single-phase grounding full compensation, the intensive multiplexing reactive compensation grounding fault full compensation topology has the advantages of greatly reduced volume, convenient deployment and implementation and lower comprehensive cost; the reactive compensation and the earth fault current compensation loop are independent, and the fluctuation of the reactive power of the reactive compensation system part can not be caused during earth fault compensation, so that the problems of system reactive power oscillation and voltage stability can not be caused.
The implementation of the present application also discloses a design method of the above system, and as shown in fig. 4, the specific method includes:
s110: acquiring the capacity of a reactive power compensation device according to the reactive power planning of a target system and the current standard;
s120: acquiring grounding compensation capacity according to the capacitance current capacity of the target system;
s130: acquiring the capacity of the multiplexing compensation transformer according to the capacity of the reactive compensation device and the grounding compensation capacity;
s140: acquiring primary side equivalent leakage reactance of the multiplexing compensation transformer according to the rated line voltage of the target system and the capacity of the reactive power compensation device;
s150: acquiring rated primary voltage of the injection transformer according to rated secondary voltage of the multiplexing compensation transformer;
s160: acquiring a rated voltage ratio of the injection transformer according to the primary side equivalent leakage reactance of the multiplexing compensation transformer, the capacity of the reactive power compensation device and the rated secondary voltage of the multiplexing compensation transformer;
s170: the capacity of the harmonic and voltage regulation module is 1% -20% of the capacity of the injection transformer.
The specific implementation mode comprises the following steps:
(1) the capacity of the reactive power compensation device is determined according to the reactive power planning of a target system and the calculation of the current national standard or according to the estimation of the rated capacity of the transformer according to the relevant regulations, and the resonance capacity is avoided.
(2) And determining the capacitance current capacity of the system according to the capacitance current of the target system and the perspective plan. And when the target system is a neutral point ungrounded system, determining the grounding compensation capacity as the system capacitance current capacity. When the target system is an arc suppression coil grounding system, determining grounding compensation capacity as an absolute value of a difference value of the system capacitance current capacity and the arc suppression coil capacity;
(3) and determining the capacity of the multiplexing compensation transformer as the sum of the capacity of the reactive compensation device and the target system grounding compensation capacity, and setting a margin of 10% -50%. And the rated voltage of the primary side of the multiplexing compensation transformer is the rated voltage of a target system. And calculating the equivalent leakage reactance of the primary side of the multiplexing compensation transformer, wherein the value of the equivalent leakage reactance is equal to the inductive reactance of the required series reactance determined according to the capacity and the reactance rate of the installed reactive compensation device, and the reactance rate is 5-15%. Determining a calculation formula of the primary side equivalent leakage reactance of the multiplexing transformer according to the capacity and the reactance rate of the reactive compensation device as follows:
wherein X is equivalent leakage reactance (ohm unit) at primary side of the multiplexing compensation transformer, K is selected reactance rate (dimensionless), U is rated line voltage (kV unit) of the target system, and Q is C Is the capacity (in kvar) of the reactive power compensation device.
(4) The rated capacity of the injection transformer is 110% -150% of the system grounding compensation capacity. The rated primary voltage of the injection transformer is calculated by the following formula:
wherein U is 21 Rated primary voltage (in kV) for injection transformer, U 12 And (3) rated secondary voltage (in kV) for the multiplexing compensation transformer.
The rated voltage ratio n of the injection transformer is calculated according to the following formula:
wherein n is the rated voltage ratio of the injection transformer, m is the rated voltage ratio of the multiplexing compensation transformer, Zc is the capacitance reactance of the current system to the ground distribution capacitance, and Z L Is an arc suppression coil inductive reactance, X is a primary side equivalent leakage reactance of the multiplexing transformer, X 2 For injecting into the primary side equivalent leakage reactance, Q, of the transformer C Is the capacity (positive when inductive reactive and negative when capacitive reactive, in Mvar) of the reactive compensation device, U 12 Rated secondary voltage (unit is kV) for the multiplexing compensation transformer, Zc// Z L Denotes Zc and Z L The parallel impedance of (1).
(5) The rated voltage of the secondary side of the injection transformer is +/-10% -50% adjustable; the capacity of the harmonic and voltage regulation module is 1% -20% of the capacity of the injection transformer.
Further, as shown in fig. 2, the multiplexing controller 7 includes:
the system signal acquisition module 71 is configured to acquire a bus voltage, a bus load current, a line current, a multiplexing compensation transformer voltage, and a multiplexing compensation transformer current signal of the power system;
a system state judging and switching module 72, configured to judge that the power system is in a normal operation state or a single-phase ground fault state according to the signal acquired by the system signal acquisition module 71, and control the ground fault compensation switch 4;
and the ground fault full compensation control module 73 is used for controlling the injection transformer 5 and the harmonic wave and voltage adjusting module 6 to adjust the compensation voltage and the compensation current during single-phase grounding according to the signal acquired by the system signal acquisition module 71.
The multiplex controller 7 also comprises a protection module 74 for isolating system faults in the event of faults such as short circuits, overloads, etc.
Referring to fig. 3, in an embodiment of a full-compensation topology structure for ground fault multiplexing reactive compensation and a specific design of the present application, in this embodiment, a target system is a 10kV neutral point ungrounded system and does not include an arc suppression coil. According to the reactive power planning of the system, a reactive power compensation device 3 is designed to adopt a capacitor bank, and the capacity is 2 Mvar; calculating to obtain the equivalent leakage reactance of the primary side of the multiplexing compensation transformer 1 to be 2.5 omega when the reactance rate is 5%; determining the grounding compensation capacity to be 500kVA according to the system capacitance current and the perspective plan; determining the capacity of the multiplexing compensation transformer 1 to be 2.3MVA, the equivalent leakage reactance of the primary side to be 2.5 omega and the voltage ratio to be 10kV/10kV according to the capacity of the reactive compensation device 3, the grounding compensation capacity and the leakage reactance of the multiplexing compensation transformer 1; and calculating the grounding compensation capacity to determine that the rated voltage ratio of the injection transformer 5 is 5.77kV/5.2kV, the capacity of the injection transformer is 600kVA, the capacity of the +/-20% adjustable single-phase regulating transformer is 100kVA, and the capacity of the harmonic wave and voltage regulating module is 100 kVA. The multiplexing compensation transformer 1 is connected with Yyn6, one side of the multiplexing compensation transformer is connected with a system bus, the other side of the multiplexing compensation transformer is connected with a reactive compensation switch 2, and the neutral point is grounded. The reactive compensation switch 2 adopts a three-phase circuit breaker, one side of the three-phase circuit breaker is respectively connected with the multiplexing compensation transformer 1 and the ground fault compensation switch 4, and the other side of the three-phase circuit breaker is connected with the reactive compensation device 3. And the ground fault compensation switch 4 comprises three single-phase circuit breakers, one ends of the three single-phase circuit breakers are respectively connected with the multiplexing compensation transformer 1 and the reactive compensation switch 2, and the other ends of the three single-phase circuit breakers are in short circuit and are connected with the harmonic wave and voltage regulation module 6 and the injection transformer 5. One side of the injection transformer 5 is respectively connected with the short-circuit end of the ground fault compensation switch 4 and the ground, and the other side is connected with the system neutral point and the ground. And the multiplexing controller 7 judges the running state of the system, controls the grounding phase of the grounding fault compensation switch 4 to be closed when the single phase is grounded, and adjusts the transformation ratio of the harmonic and voltage adjusting module 6 and the injection transformer 5 to realize the grounding fault full compensation.
The application discloses a ground fault full-compensation topology for multiplexing reactive compensation and a specific topology design method thereof, reactive power compensation and harmonic wave processing are carried out when an electric power system normally operates, ground fault current full-compensation is carried out when a system has a single-phase ground fault, the full-life cycle work is carried out, and the utilization rate of a single-phase ground compensation device is improved.
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 (10)
1. The utility model provides a full compensation topology of earth fault of multiplexing reactive compensation, which comprises multiplexing compensation transformer (1), reactive compensation switch (2), reactive power compensator (3), earth fault compensation switch (4), injection transformer (5), harmonic and voltage regulation module (6) and multiplexing controller (7), wherein:
one side of the multiplexing compensation transformer (1) is connected with a power grid system bus, and the other side of the multiplexing compensation transformer is connected with the reactive power compensation switch (2) and the ground fault compensation switch (4);
one side of the reactive compensation switch (2) is connected with the multiplexing compensation transformer (1), and the other side of the reactive compensation switch is connected with the reactive compensation device (3);
one side of the ground fault compensation switch (4) is connected with the multiplexing compensation transformer (1), the reactive compensation switch (2) and the reactive compensation device (3), and the other side is connected with the injection transformer (5) and the harmonic and voltage regulation module (6);
one side of the injection transformer (5) is connected with the ground fault compensation switch (4) and the harmonic and voltage regulation module (6), and the other side of the injection transformer is connected with a system neutral point;
one side of the harmonic and voltage regulation module (6) is connected with the injection transformer (5) and the ground fault compensation switch (4), and the other side is grounded;
the multiplexing controller (7) is connected with the ground fault compensation switch (4), the injection transformer (5) and the harmonic and voltage regulation module (6);
the design method of the multiplexing reactive compensation ground fault full compensation topology comprises the following steps:
acquiring the capacity of a reactive power compensation device according to the reactive power planning of a target system and the current standard;
acquiring a grounding compensation capacity according to the capacitance current capacity of the target system;
acquiring the capacity of the multiplexing compensation transformer according to the capacity of the reactive compensation device and the grounding compensation capacity;
acquiring primary side equivalent leakage reactance of the multiplexing compensation transformer according to the rated line voltage of the target system and the capacity of the reactive power compensation device;
acquiring rated primary voltage of the injection transformer according to rated secondary voltage of the multiplexing compensation transformer;
acquiring a rated voltage ratio of the injection transformer according to the primary side equivalent leakage reactance of the multiplexing compensation transformer, the capacity of the reactive power compensation device and the rated secondary voltage of the multiplexing compensation transformer;
the capacity of the harmonic and voltage regulation module is 1% -20% of the capacity of the injection transformer.
2. The multiplexed reactive power compensated ground fault fully compensated topology according to claim 1, characterized in that the multiplexed controller (7) comprises:
the system signal acquisition module (71) is used for acquiring bus voltage, bus load current, line current, multiplexing compensation transformer voltage and multiplexing compensation transformer current signals of the power system;
the system state judging and switching module (72) is used for judging whether the power system is in a normal operation state or a single-phase earth fault state according to the signals collected by the system signal collecting module (71) and controlling the earth fault compensation switch (4);
the ground fault full compensation control module (73) is used for controlling the injection transformer (5) and the harmonic and voltage regulation module (6) to regulate the compensation voltage and the compensation current during single-phase grounding according to the signals collected by the system signal collection module (71);
and a protection module (74) for isolating the system fault when a short circuit or overload fault occurs.
3. The multiplexing reactive compensation ground fault full compensation topology of claim 1, characterized in that the multiplexing compensation transformer (1) is a transformer or a combination of transformers;
the multiplexing compensation transformer (1) is used for providing series reactance for the reactive compensation device (3) so as to suppress system harmonic waves;
the multiplexing compensation transformer (1) is also used for providing a reactive compensation channel isolated from a power system;
the multiplexing compensation transformer (1) is also used for converting the system line voltage into a phase voltage opposite to the system phase power supply, and the phase voltage is used as a compensation power supply for single-phase grounding full compensation.
4. The ground fault full compensation topology for multiplexing reactive compensation of claim 1, characterized in that the reactive compensation device (3) is a three-phase capacitor bank or other reactive compensation device.
5. The multiplexed reactive power compensated ground fault full compensation topology of claim 1, characterized in that the ground fault compensation switch (4) is a combination of three single phase switches.
6. The ground fault full compensation topology with multiplexing reactive compensation according to claim 1, characterized in that the injection transformer (5) is a single-phase transformation ratio adjustable transformer.
7. The ground fault full compensation topology with multiplexing reactive compensation according to claim 1, characterized in that the harmonic and voltage regulation module (6) is a combination of controllable capacitors and controllable reactors;
the harmonic and voltage regulating module (6) is used for filtering grounding harmonic waves and regulating grounding compensation voltage during grounding fault compensation.
8. The multiplexing reactive compensation ground fault fully compensated topology of claim 1, wherein the system neutral point is a system neutral point drawn by a grounding transformer, a system neutral point drawn by a main transformer of an electric power system, or a system neutral point drawn by the multiplexing compensation transformer (1).
9. A method for designing a ground fault full-compensation topology for multiplexing reactive compensation is characterized by comprising the following steps:
acquiring the capacity of a reactive compensation device according to the reactive planning of a target system and the current standard;
acquiring a grounding compensation capacity according to the capacitance current capacity of the target system;
acquiring the capacity of the multiplexing compensation transformer according to the capacity of the reactive compensation device and the grounding compensation capacity;
acquiring primary side equivalent leakage reactance of the multiplexing compensation transformer according to the rated line voltage of the target system and the capacity of the reactive power compensation device;
acquiring rated primary voltage of an injection transformer according to rated secondary voltage of the multiplexing compensation transformer;
acquiring a rated voltage ratio of an injection transformer according to the primary side equivalent leakage reactance of the multiplexing compensation transformer, the capacity of the reactive power compensation device and the rated secondary voltage of the multiplexing compensation transformer;
the capacity of the harmonic and voltage regulation module is 1% -20% of the capacity of the injection transformer.
10. The method for designing the ground fault full compensation topology for multiplexing reactive compensation according to claim 9,
according to
Obtaining a primary side equivalent leakage reactance X of the multiplexing compensation transformer, wherein X is the primary side equivalent leakage reactance of the multiplexing compensation transformer, K is the reactance rate, U is the rated line voltage of a target system, and Q C The capacity of the reactive power compensation device;
according to
Obtaining a rated primary voltage of the injection transformer, wherein U 21 Rated primary voltage, U, for the injection transformer 12 Rated secondary voltage for the multiplexing compensation transformer;
according to
Obtaining a rated voltage ratio of the injection transformer;
wherein n is the rated voltage ratio of the injection transformer, m is the rated voltage ratio of the multiplexing compensation transformer, Zc is the capacitance reactance of the current system to the ground distribution capacitor, and Z L Is an arc suppression coil inductive reactance, X is a primary side equivalent leakage reactance of the multiplexing transformer, X 2 For injecting into the primary side equivalent leakage reactance, Q C For the capacity, U, of the reactive power compensation means 12 Rated secondary voltage for said multiplying compensation transformer, Zc// Z L Denotes Zc and Z L The parallel impedance of (1).
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