CN110707669B - Method and device for controlling filter bank of magnetically controlled high-voltage shunt reactor in circuit reclosing - Google Patents
Method and device for controlling filter bank of magnetically controlled high-voltage shunt reactor in circuit reclosing Download PDFInfo
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- CN110707669B CN110707669B CN201911051924.3A CN201911051924A CN110707669B CN 110707669 B CN110707669 B CN 110707669B CN 201911051924 A CN201911051924 A CN 201911051924A CN 110707669 B CN110707669 B CN 110707669B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
Abstract
The invention discloses a method and a device for controlling a filter bank of a magnetically controlled high-voltage shunt reactor in a circuit reclosing, wherein the method comprises the following steps: in the circuit reclosing process, judging whether a circuit loses power according to a circuit protection tripping signal, and if the circuit loses power, exiting a filter bank; detecting the voltage amplitude, the frequency and the current amplitude of the filter bank, judging whether low voltage or low frequency occurs, and quitting the filter bank if the low voltage or low frequency occurs; and after the detection system is successfully reclosed and the capacitor is fully discharged, the filter bank is put into the detection system again. The invention enables the filter bank to adapt to the requirement of circuit reclosing, and the filter bank can be reliably and quickly withdrawn under the full working condition according to the trip signal of circuit protection and the electrical characteristics of the side of the reactor filter bank, thereby avoiding the impact damage to the filter bank caused by the reclosing process.
Description
Technical Field
The invention belongs to the technical field of electrical engineering, and particularly relates to a method and a device for controlling a filter bank of a magnetically controlled high-voltage shunt reactor in a circuit reclosing.
Background
The magnetically controlled high-voltage shunt reactor is a novel Flexible Alternating Current Transmission System (FACTS) device, and the reactance value of a main loop iron core winding is adjusted by adjusting the current of a reactor control winding to change the magnetic saturation of an iron core, so that the function of adjusting reactive power is achieved. By continuously adjusting and controlling the winding current, the capacitive reactive power of the transmission line can be dynamically compensated, the capacitive boost effect, the power frequency overvoltage and the secondary arc current of the ultra/ultra-high voltage transmission line are inhibited, and the system stability is improved.
The magnetically controlled high-voltage shunt reactor can be connected to the side of a transmission line and can also be connected to the side of an in-station bus. At present, the topological structure of a magnetically controlled high-voltage parallel reactor system which is common in engineering application at home and abroad is shown in figure 3, and a reactor body comprises a network side winding, a compensation winding and a control winding: the grid side winding is connected in parallel with the ultra/ultra-high voltage transmission line, the compensation winding provides an excitation system alternating current power supply and is connected with the filter bank, and the control winding is connected with the direct current excitation current which is rectified and converted by the ACDC to adjust the magnetic saturation of the iron core. The magnetic control high-voltage parallel reactor can generate certain harmonic current to be injected into a power system due to saturation of an iron core in the working process, and the magnetic control high-voltage parallel reactor mainly takes 5-order, 7-order, 11-order and other odd-order harmonics as the main factors. In order to meet the requirements of relevant standards on equipment harmonic waves, 1 group or a plurality of groups of LC harmonic filter groups are required to be arranged on a compensation winding to suppress the harmonic waves generated by the reactor as an important component of the magnetically controlled high-voltage parallel reactor. Accordingly, a capacitor protection device or the like is usually provided to protect the filter bank from abnormality.
In order to increase the power supply reliability, the transmission line generally requires a single-phase/three-phase superposition function. For a line type magnetically controlled high-voltage shunt reactor, the ability of rapidly recharging after power failure must be provided. Since it installs the filter bank on the compensation side, if the system is quickly recharged via a recloser, it may cause a very large impact or even damage to the capacitor bank. Therefore, the problem of reliable and quick exit of the filter bank of the line type magnetically controlled high-voltage shunt reactor needs to be considered in the circuit reclosing process.
Conventional capacitor bank protection devices employ a low voltage protection function as a capacitor exit mechanism when the system is de-energized. The low-voltage conventional capacitor bank and other bus reactive compensation equipment does not have the requirement of rapid re-investment in the second-level range of circuit reclosing, and can correctly quit the capacitor bank only by ensuring low voltage. The general main criteria for field low-voltage action protection are as follows: the device detects the voltage reduction of the filter bank terminal, judges that the three-phase highest voltage is less than a set low-voltage threshold value, and exits from the filter bank. The low-voltage threshold is set to be generally lower and is about 10-30% of the rated voltage value.
The capacitor group which is conventionally installed on the low-voltage side of a bus in a station and the like can meet the action requirement, but because the line type magnetically controlled high-voltage shunt reactor is directly connected to a line, when the line fails and trips, due to the existence of distributed capacitance, interphase coupling and the like of the line, the line voltage change process after the line trips is related to the fault type, the line length, the line distributed capacitance parameters and the like. The voltage variation process of the compensation side capacitor bank is more complicated compared with the conventional substation bus or the low-voltage side capacitor bank.
Particularly, for line fault three-phase tripping, due to the existence of line capacitance and inductance energy, after the line is tripped, an energy gradual attenuation process exists, and the possible amplitude attenuation of three-phase voltage is slow and the time is long. Under certain engineering parameters, the waveform of the instantaneous value of the voltage of the capacitor after the three-phase switch is disconnected is shown in fig. 4, the simulation waveform of the effective value of the fundamental wave of the Fourier decomposition is shown in fig. 5, the effective value of the fundamental wave of the voltage is reduced by about 10.5kV from 12.1kV within 1s, and the amplitude reduction of the fundamental wave of the voltage is limited within the second-level time.
Therefore, only by the low-voltage protection function of the conventional capacitor bank protection device, the problem of insufficient sensitivity may exist in the circuit reclosing process, and the filter bank cannot be reliably disconnected under all working conditions.
Aiming at the problem and the requirement of circuit reclosing, special electrical characteristics on the side of a filter bank of a magnetically controlled high-voltage shunt reactor in the circuit reclosing process need to be researched, a detection method for the power loss of the filter bank is enriched, the filter bank can be ensured to have rapidity and reliability in quitting control in the circuit reclosing process, and the capacitor is prevented from being impacted and damaged by the reclosing.
Disclosure of Invention
The invention aims to provide a method and a device for controlling a magnetically controlled high-voltage shunt reactor filter bank in circuit reclosing, aiming at the problems that the field low-voltage action protection criterion of the magnetically controlled high-voltage shunt reactor filter bank in the current circuit reclosing process is single, the voltage change process and the fault type of a circuit after the circuit is tripped are not considered, and the sensitivity is possibly insufficient in the circuit reclosing process.
In order to achieve the above purpose, the solution of the invention is:
on one hand, the invention provides a method for controlling a filter bank of a magnetically controlled high-voltage shunt reactor in a circuit reclosing, which is characterized by comprising the following steps:
judging whether the line loses power or not according to the line protection tripping signal, and if so, exiting the reactor filter bank; detecting three-phase voltage amplitude, frequency and three-phase current amplitude of the filter bank, judging whether a low-voltage fault and a low-frequency fault occur, and if the low-voltage fault and/or the low-frequency fault occur, quitting the reactor filter bank; and judging that the system is successfully reclosed and the capacitor is fully discharged, and putting the reactor filter bank again.
Detecting whether the line protection devices at two ends of the line send out a trip signal of a line breaker or a single-circuit running line, and if the line protection devices send out the trip signal of the line breaker at the power transmission end, determining that the line is power-off and exiting a reactor filter bank;
further, the low-frequency fault judgment of the filter bank voltage is carried out according to the following method:
detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAFrequency f of three-phase voltageAB、fBC、fCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-frequency fault characteristics, starting a low-frequency action element, and exiting the reactor filter bank;
where min is the minimum value of the solution variable, max is the maximum value of the solution variable, Uf_setVoltage threshold for low frequency fault determination, fFC_setFrequency threshold for low-frequency fault determination, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
In the voltage low-frequency fault judgment method, the minimum value of the three-phase voltage frequency is smaller than a set value fFC_setThe method is a main criterion, and the trip operation of the line is quickly identified aiming at the working conditions of line three-phase trip and the like with slow voltage amplitude reduction and obvious frequency change, so that the filter bank is withdrawn.
Further, the low-voltage fault judgment of the filter bank voltage is carried out according to the following method:
detecting three-phase voltage amplitude U of filter bankAB、UBC、UCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-voltage fault characteristic, starting a low-voltage action element, and exiting the filter bank;
in the formula of UFC_setDetermination of the voltage threshold for Low-Voltage faults, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
In the voltage low-voltage fault judgment method, the maximum value of the amplitude of the three-phase voltage is smaller than a set value UFC_setThe method is used as a main criterion, and the circuit tripping operation is quickly identified according to the circuit tripping working condition of the quick reduction of the voltage amplitude, so that the filter bank is withdrawn.
Further, if at least one of the following two conditions is satisfied, the filter system is determined to be abnormal, and the filter bank is exited:
responding to the low-frequency fault of the filter bank voltage, starting the low-frequency action element, and judging the time delay T with the duration time more than or equal to the low frequencyset1，Tset1Setting less than line protectionThe protection reclosing sets time to ensure that the filter bank exits before the circuit reclosing;
responding to the low voltage fault of the filter bank voltage, starting the low voltage action element, and judging the time delay T with the duration time more than or equal to the low voltageset2，Tset2The setting of the filter bank is less than the setting time of the line protection reclosing so as to ensure that the filter bank exits before the line reclosing;
and further, responding to the low-frequency fault of the voltage of the filter bank, starting the low-frequency action element, and judging the time delay T with the duration time being more than or equal to the low frequencyset1Then low frequency trip signal fOPSetting;
responding to the low voltage fault of the filter bank voltage, starting the low voltage action element, and judging the time delay T with the duration time more than or equal to the low voltageset2Then low voltage tripping signal UOPAnd setting.
When low frequency tripping signal fOPOr low voltage tripping signal UOPAt least one is set and the filter bank is exited.
Further, after the filter bank is withdrawn, the detection reactor compensates and measures the fundamental wave amplitude U of the three-phase voltageAB、UBC、UCA(ii) a When the following formula is met, judging that the system is successfully reclosed, enabling the filter bank to meet the condition of reentering, and starting the reentering timing of the filter bank;
min(UAB,UBC,UCA)>UFC_set
when the filter bank reentering timing is more than or equal to the filter bank reentering delay Tset3And putting into a filter bank. Wherein, Tset3The time of the capacitor bank full discharge is required to be longer than the time of the capacitor bank full discharge, the capacitor full discharge is guaranteed through the delay, and the phenomenon that the system is electrified again quickly through reclosing and possibly causes very large impact and even damage to the capacitor bank is avoided.
In the step, the success of circuit reclosing is identified through the detection of the three-phase voltage of the compensation side of the reactor, the winding on the net side of the reactor is electrified again, and the filter bank meets the condition of re-input, so that the filter bank is controlled to automatically re-input to operate, and the influence of the output harmonic wave of the reactor is reduced.
In another aspect, the present invention provides a filter bank control apparatus for a magnetically controlled high-voltage shunt reactor in a line reclosing, including: the switching value input module, the voltage measuring module, the current measuring module, the judging module, the switching-off control unit and the switching-on control unit are arranged;
the switching value input module is used for detecting a tripping signal of the circuit breaker sent by the circuit protection device;
the voltage measurement module is used for detecting the fundamental wave amplitude U of the three-phase voltage of the filter bankAB、UBCAnd UCAAnd a frequency fAB、fBCAnd fCA；
The current measuring module detects three-phase current I of the filter bankA、IBAnd IC；
The judging unit is used for judging whether the line loses power or not according to the line protection tripping signal; judging whether a low-voltage fault and/or a low-frequency fault occurs or not according to the three-phase voltage amplitude, the frequency and the three-phase current amplitude of the filter bank obtained by the voltage measuring module and the current measuring module; judging whether the system is successfully reclosed and the capacitor is fully discharged;
the brake-separating control unit is used for exiting the reactor filter bank according to the judgment result of the judgment unit; if the judgment result of the judgment unit is that the line is power-off, the reactor filter bank is controlled to exit; if the judgment result of the judgment unit has a low-voltage fault or a low-frequency fault, the reactor filter bank is withdrawn;
and the switching-on control unit is used for switching into the reactor filter bank again according to the judgment result of the judgment unit, wherein the system is successfully switched on again and the capacitor is fully discharged.
Further, comprising: the judging unit comprises a low-voltage fault judging module and a low-frequency fault judging module, and the low-voltage fault judging module is used for judging whether a low-voltage fault occurs or not according to the three-phase voltage amplitude and the three-phase current amplitude of the filter bank obtained by the voltage measuring module and the current measuring module; and the low-frequency fault judgment module is used for judging whether a low-frequency fault occurs according to the three-phase voltage amplitude, the three-phase frequency and the three-phase current amplitude of the filter bank obtained by the voltage measurement module and the current measurement module.
Further, the low-frequency fault judgment module judges the low-frequency fault of the filter bank voltage according to the following method:
detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAFrequency fAB、fBC、fCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-frequency fault characteristics, starting a low-frequency action element, and exiting the filter bank;
where min is the minimum value of the solution variable, max is the maximum value of the solution variable, Uf_setVoltage threshold for low frequency fault determination, fFC_setFrequency threshold for low-frequency fault determination, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
Further, the low-voltage fault judgment module judges the low-voltage fault of the filter bank according to the following method:
detecting three-phase voltage amplitude U of filter bankAB、UBC、UCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-voltage fault characteristic, starting a low-voltage action element, and exiting the filter bank;
in the formula of UFC_setDetermination of the voltage threshold for Low-Voltage faults, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
Further, a filter bankAfter exiting, the judging unit receives the fundamental wave amplitude U of the three-phase voltage of the filter group detected by the voltage measuring moduleAB、UBC、UCA(ii) a When the judging unit detects that the following formula is met, the filter bank is judged to meet the reentering condition, and the filter bank reentering timing is started.
min(UAB,UBC,UCA)>UFC_set
When the filter bank reentering timing is more than or equal to the filter bank reentering delay Tset3And putting into a filter bank. Wherein, Tset3Should be greater than the time for which the capacitor bank is fully discharged.
The beneficial technical effects are as follows:
the invention discloses a method and a device for controlling a filter bank of a magnetically controlled high-voltage shunt reactor in circuit reclosing, which combine the protection tripping signals of the circuits at the side and the opposite side of a transformer substation and the low-voltage and low-frequency electrical characteristics of the filter bank side of the reactor, quickly and reliably break the filter bank in the circuit reclosing process, avoid the impact of the reclosing on a capacitor and ensure the safe operation of the filter bank.
Drawings
FIG. 1 is a schematic diagram of a method for controlling a filter bank of a magnetically controlled high-voltage shunt reactor in a circuit reclosing;
FIG. 2 is a schematic diagram of a filter bank control device of a magnetically controlled high-voltage shunt reactor in a circuit reclosing;
FIG. 3 is a typical primary electrical topology of a magnetically controlled high voltage shunt reactor system;
FIG. 4 is a three-phase fault three-phase trip and filter bank three-phase voltage instantaneous value waveform of a line;
FIG. 5 is a three-phase fault three-phase trip of a line, filter bank voltage fundamental effective value waveform;
fig. 6 is a three-phase trip, filter bank voltage frequency waveform for a three-phase fault in a line.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
Example 1
The embodiment of the invention provides a method for controlling a filter bank of a magnetically controlled high-voltage shunt reactor in a circuit reclosing, which comprises the following specific steps of:
(1) according to the line protection tripping signal, whether the line loses power or not is judged, and the filter bank exits after the power loss, specifically: detecting whether the line protection devices at two ends of the line send out a trip signal of a line breaker or a single-circuit running line, and if the line protection devices send out the trip signal of the line breaker at the power transmission end, determining that the line is power-off and exiting a reactor filter bank;
(2) as shown in fig. 6, when a three-phase fault of a line trips, an obvious low-frequency characteristic is shown under some working conditions, and corresponding to the same simulation working condition shown in fig. 4 and 5, a filter bank voltage frequency waveform shows an obvious rapid drop after the line is switched off, and according to the characteristic, low-frequency judgment of the filter bank voltage is performed, and the specific steps are as follows:
detecting fundamental wave amplitude (i.e. three-phase voltage amplitude) U of three-phase voltage of filter bankAB、UBC、UCAFrequency fAB、fBC、fCAAnd three-phase current IA、IB、IC；
When the following formula is satisfied, the filter bank voltage is judged to satisfy the low-frequency fault characteristic, and the low-frequency action element is started, namely, the reactor filter bank is withdrawn:
where min is the minimum value of the solution variable, max is the maximum value of the solution variable, Uf_setDetermining the voltage threshold for low frequencies, fFC_setFrequency threshold for low frequency determination, IFC_setThe current blocking threshold value is judged at low frequency, and the three can be set.
Starting the low-frequency action element, starting timing, and judging the time delay T when the duration time is more than or equal to the low frequencyset1Then low frequency trip signal fOPAnd setting. If the low-frequency action element returns in the timing process, the timing is cleared; the next time the low frequency action component is started, the timing is restarted.
Uf_setTaking a rated voltage value of the terminal voltage of the filter bank to be 10-30%; f. ofFC_setTaking 40-45 Hz; i isFC_setTaking the rated current value of the filter bank to be 20-50 percent, Tset1The setting is less than the line protection reclosing setting time.
(3) And judging the low voltage of the filter bank, which comprises the following steps:
detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAAnd three-phase current IA、IB、IC(ii) a And when the following formula is met, judging that the voltage of the filter bank meets the low-voltage fault characteristic, and starting the low-voltage action element.
In the formula of UFC_setThe fixed value can be set for judging the voltage threshold value for low voltage.
Starting the low-voltage action element, starting timing, and judging the delay T when the duration time is more than or equal to the low frequencyset2Then low voltage tripping signal UOPAnd setting. If the low-voltage action element returns in the timing process, the timing is cleared; the next time the low voltage actuation element is started, the timing is restarted.
Wherein, UFC_setTaking the rated voltage value of the filter bank terminal voltage as 50-70 percent, Tset2Is less than the line protection reclosing setup time.
(4) Such as fOPOr UOPAnd if the output value is 1, outputting a filter bank tripping signal OP and exiting the filter bank.
(5) After the filter bank is withdrawn, the compensation of the detection reactor is used for detecting the fundamental wave amplitude U of the three-phase voltageAB、UBC、UCA(ii) a And when the following formula is met, judging that the filter bank meets the re-investment condition, and starting the filter bank re-investment timing.
min(UAB,UBC,UCA)>UFC_set
When the filter bank reentering timing is larger than or equal to the filter bank reentering delayTset3And putting into a filter bank. Wherein, Tset3Should be greater than the time for which the capacitor bank is fully discharged.
Example 2
The embodiment of the invention provides a filter bank control device of a magnetically controlled high-voltage shunt reactor in a circuit reclosing, which comprises the following components in percentage by weight as shown in figure 2: the device comprises a switching value input module, a voltage measuring module, a current measuring module, a judging unit, a switching-off control unit and a switching-on control unit.
The switching value input module is used for detecting a circuit breaker tripping signal sent by circuit protection devices at two ends of a line or a circuit breaker tripping signal sent by a circuit protection device at a power transmission end of a single-circuit operation line; voltage measuring module for detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAFrequency f of three-phase voltageAB、fBC、fCA(ii) a A current measuring module for detecting three-phase current I of the filter bankA、IB、IC。
The judging unit is used for receiving a tripping signal of the circuit breaker detected by the switching value input module, determining that the circuit is out of power if the tripping signal exists, controlling the brake-separating control unit and exiting the reactor filter bank;
a judging unit for receiving the fundamental wave amplitude U of the three-phase voltage of the filter bank detected by the voltage measuring module and the current measuring moduleAB、UBC、UCAFrequency f of three-phase voltageAB、fBC、fCAAnd three-phase current IA、IB、IC(ii) a When the judgment unit detects that the following formula is met, the filter bank voltage is judged to meet the low-frequency fault characteristic, and the low-frequency action element is started.
Where min is the minimum value of the solution variable, max is the maximum value of the solution variable, Uf_setDetermining the voltage threshold for low frequencies, fFC_setFrequency threshold for low frequency determination, IFC_setDetermining current blocking for low frequenciesAnd the threshold value can be set.
The low-frequency action element is started, and the duration time is more than or equal to the low-frequency judgment delay Tset1Then low frequency trip signal fOPAnd setting.
Wherein, Uf_setTaking a rated voltage value of the terminal voltage of the filter bank to be 10-30%; f. ofFC_setTaking 40-45 Hz; i isFC_setTaking the rated current value of the filter bank to be 20-50 percent, Tset1The setting is less than the line protection reclosing setting time.
A judging unit for receiving the fundamental wave amplitude U of the three-phase voltage of the filter bank detected by the voltage measuring module and the current measuring moduleAB、UBC、UCAAnd three-phase current IA、IB、IC(ii) a When the judgment unit detects that the following formula is met, the filter bank voltage is judged to meet the low-voltage fault characteristic, and the low-voltage action element is started.
In the formula of UFC_setThe fixed value can be set for judging the voltage threshold value for low voltage.
Low-voltage action element starting duration greater than or equal to low-frequency judging delay Tset2Then low voltage tripping signal UOPAnd setting.
Wherein, UFC_setTaking the rated voltage value of the filter bank terminal voltage as 50-70 percent, Tset2Is less than the line protection reclosing setup time.
Such as fOPOr UOPAnd if the output signal is 1, the judgment unit outputs a filter bank tripping signal OP, controls the brake-separating control unit and exits from the filter bank.
After the filter bank exits, the judging unit receives the fundamental wave amplitude U of the three-phase voltage of the filter bank detected by the voltage measuring moduleAB、UBC、UCA(ii) a When the judging unit detects that the following formula is met, the filter bank is judged to meet the reentering condition, and the filter bank reentering timing is started.
min(UAB,UBC,UCA)>UFC_set
When the filter bank reentering timing is more than or equal to the filter bank reentering delay Tset3And controlling a closing control unit to input the filter bank. Wherein, Tset3Should be greater than the time for which the capacitor bank is fully discharged.
Example 3: a magnetic control high-voltage shunt reactor filter unit control device in a circuit reclosing comprises: the switching value input module, the voltage measuring module, the current measuring module, the judging module, the switching-off control unit and the switching-on control unit are arranged;
the switching value input module is used for detecting a tripping signal of the circuit breaker sent by the circuit protection device; a voltage measurement module for detecting fundamental wave amplitude U of three-phase voltage of the filter bankAB、UBCAnd UCAAnd frequency f of three-phase voltageAB、fBCAnd fCA(ii) a A current measuring module for detecting three-phase current I of the filter bankA、IBAnd IC；
The judging unit is used for judging whether the line loses power or not according to the line protection tripping signal; judging whether a low-voltage fault and/or a low-frequency fault occurs or not according to the three-phase voltage amplitude, the three-phase frequency and the three-phase current amplitude of the filter bank obtained by the voltage measuring module and the current measuring module; judging whether the system is successfully reclosed and the capacitor is fully discharged;
the brake-separating control unit is used for exiting the reactor filter bank according to the judgment result of the judgment unit; and if the judgment result of the judgment unit is that the line is in power failure or the judgment result of the judgment unit has a low-voltage fault or a low-frequency fault, the reactor filter bank is controlled to exit.
And the switching-on control unit is used for switching into the reactor filter bank again according to the judgment result of the judgment unit, wherein the system is successfully switched on again and the capacitor is fully discharged.
On the basis of the above embodiments, the specific embodiment further includes: the judging unit comprises a low-voltage fault judging module and a low-frequency fault judging module, and the low-voltage fault judging module is used for judging whether a low-voltage fault occurs or not according to the three-phase voltage amplitude and the three-phase current amplitude of the filter bank obtained by the voltage measuring module and the current measuring module; and the low-frequency fault judgment module is used for judging whether a low-frequency fault occurs according to the three-phase voltage amplitude, the three-phase frequency and the three-phase current amplitude of the filter bank obtained by the voltage measurement module and the current measurement module.
On the basis of the above embodiments, the specific embodiment further includes: the low-frequency fault judgment module judges the low-frequency fault of the voltage of the filter bank according to the following method:
detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAFrequency f of three-phase voltageAB、fBC、fCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-frequency fault characteristics, starting a low-frequency action element, and exiting the filter bank;
where min is the minimum value of the solution variable, max is the maximum value of the solution variable, Uf_setVoltage threshold for low frequency fault determination, fFC_setFrequency threshold for low-frequency fault determination, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
The low-voltage fault judgment module judges the low-voltage fault of the filter bank according to the following method:
detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-voltage fault characteristic, starting a low-voltage action element, and exiting the filter bank;
in the formula of UFC_setDetermination of the voltage threshold for Low-Voltage faults, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A method for controlling a magnetically controlled high-voltage shunt reactor filter bank in circuit reclosing is characterized by judging whether a circuit loses power or not according to a circuit protection tripping signal, and quitting the reactor filter bank if the circuit loses power; detecting three-phase voltage amplitude, frequency and three-phase current amplitude of the filter bank, judging whether a low-voltage fault and a low-frequency fault occur, and if the low-voltage fault and/or the low-frequency fault occur, quitting the reactor filter bank; judging that the system is successfully reclosed and the capacitor is fully discharged, and putting the capacitor into the reactor filter bank again;
the low-frequency fault judgment of the filter bank voltage is carried out according to the following method:
detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAFrequency f of three-phase voltageAB、fBC、fCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-frequency fault characteristics, starting a low-frequency action element, and exiting the reactor filter bank;
where min is the minimum value of the solution variable, max is the maximum value of the solution variable, Uf_setVoltage threshold for low frequency fault determination, fFC_setFrequency threshold for low-frequency fault determination, IFC_setA current blocking threshold value for low frequency fault or voltage fault determination;
the low-voltage fault judgment of the filter bank voltage is carried out according to the following method:
detecting three-phase currents IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-voltage fault characteristic, starting a low-voltage action element, and exiting the filter bank;
in the formula of UFC_setDetermination of the voltage threshold for Low-Voltage faults, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
2. The method for controlling the filter bank of the magnetically controlled high-voltage shunt reactor in the line reclosing as claimed in claim 1, wherein the method comprises the following steps: and if the following two conditions at least meet one condition, judging that the filter system is abnormal, and exiting the filter bank:
responding to the low-frequency fault of the filter bank voltage, starting the low-frequency action element, and judging the time delay T with the duration time more than or equal to the low frequencyset1，Tset1Setting time less than the line protection reclosing setting time;
responding to the low voltage fault of the filter bank voltage, starting the low voltage action element, and judging the time delay T with the duration time more than or equal to the low voltageset2，Tset2Is less than the line protection reclosing setup time.
3. The method for controlling the filter bank of the magnetically controlled high-voltage shunt reactor in the line reclosing as claimed in claim 1, wherein the method comprises the following steps:
responding to the low-frequency fault of the filter bank voltage, starting the low-frequency action element, and judging the time delay T with the duration time more than or equal to the low frequencyset1Then low frequency trip signal fOPSetting;
responding to the low voltage fault of the filter bank voltage, starting the low voltage action element, and judging the time delay T with the duration time more than or equal to the low voltageset2Then low voltage tripping signal UOPSetting;
when low frequency tripping signal fOPOr low voltage tripping signal UOPAt least one is set and the filter bank is exited.
4. The method for controlling the filter bank of the magnetically controlled high-voltage shunt reactor in the line reclosing as claimed in claim 1, wherein the method comprises the following steps:
after the filter bank is withdrawn, the fundamental wave amplitude U of the three-phase voltage at the compensation side of the reactor is detectedAB、UBC、UCA(ii) a When the following formula is met, judging that the system is successfully reclosed, enabling the filter bank to meet the condition of reentering, and starting the reentering timing of the filter bank;
min(UAB,UBC,UCA)>UFC_set
when the filter bank reentering timing is more than or equal to the filter bank reentering delay Tset3Into a filter bank, where Tset3Greater than the full discharge time of the capacitor bank.
5. A magnetic control high-voltage shunt reactor filter unit control device in a circuit reclosing is characterized by comprising: the switching value input module, the voltage measuring module, the current measuring module, the judging module, the switching-off control unit and the switching-on control unit are arranged;
the switching value input module is used for detecting a tripping signal of the circuit breaker sent by the circuit protection device;
the voltage measurement module is used for detecting the three-phase voltage amplitude U of the filter bankAB、UBCAnd UCAAnd a frequency fAB、fBCAnd fCA；
The current measuring module detects the three-phase current amplitude I of the filter bankA、IBAnd IC；
The judging module is used for judging whether the line loses power or not according to the line protection tripping signal; judging whether a low-voltage fault and/or a low-frequency fault occurs or not according to the three-phase voltage amplitude, the three-phase frequency and the three-phase current amplitude of the filter bank obtained by the voltage measuring module and the current measuring module; judging whether the system is successfully reclosed and the capacitor is fully discharged;
the brake-separating control unit is used for exiting the reactor filter bank according to the judgment result of the judgment module; if the judgment result of the judgment module is that the line is in power failure or the judgment result of the judgment module is that a low-voltage fault or a low-frequency fault occurs, the reactor filter bank is controlled to exit;
the switching-on control unit is used for switching on the reactor filter bank again according to the judgment result of the judgment module, wherein the system is successfully switched on again and the capacitor is fully discharged;
the judging module comprises a low-frequency fault judging module, and the low-frequency fault judging module judges the low-frequency fault of the voltage of the filter bank according to the following method:
detecting three-phase voltage fundamental wave amplitude U of filter bankAB、UBC、UCAFrequency fAB、fBC、fCAAnd three-phase current IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-frequency fault characteristics, starting a low-frequency action element, and exiting the filter bank;
where min is the minimum value of the solution variable, max is the maximum value of the solution variable, Uf_setVoltage threshold for low frequency fault determination, fFC_setFrequency threshold for low-frequency fault determination, IFC_setA current blocking threshold value for low frequency fault or voltage fault determination;
the judging module comprises a low-voltage fault judging module, and the low-voltage fault judging module judges the low-voltage fault of the filter bank according to the following method:
detecting three-phase electricityStream IA、IB、IC(ii) a When the following formula is met, judging that the voltage of the filter bank meets the low-voltage fault characteristic, starting a low-voltage action element, and exiting the filter bank;
in the formula of UFC_setDetermination of the voltage threshold for Low-Voltage faults, IFC_setAnd a current blocking threshold value for low frequency fault or voltage fault judgment.
6. The filter bank control device of the magnetically controlled high-voltage shunt reactor in the line reclosing, according to claim 5, is characterized by comprising: the judging module comprises a low-voltage fault judging module and a low-frequency fault judging module; the low-voltage fault judgment module is used for judging whether a low-voltage fault occurs or not according to the three-phase voltage amplitude and the three-phase current amplitude of the filter bank obtained by the voltage measurement module and the current measurement module; and the low-frequency fault judgment module is used for judging whether a low-frequency fault occurs according to the three-phase voltage amplitude, the three-phase frequency and the three-phase current amplitude of the filter bank obtained by the voltage measurement module and the current measurement module.
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| CN201911051924.3A CN110707669B (en) | 2019-10-31 | 2019-10-31 | Method and device for controlling filter bank of magnetically controlled high-voltage shunt reactor in circuit reclosing |
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| CN101860000B (en) * | 2010-05-14 | 2012-06-13 | 河南电力试验研究院 | Quick identification method for permanent fault before single-phase reclosing of power transmission line |
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