CN106353637B - Static Var Compensator thyristor-controlled reactor accident analysis localization method - Google Patents
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Abstract
The invention discloses a kind of Static Var Compensator thyristor-controlled reactor accident analysis localization methods, step includes by the analytical calculation to recording waveform during failure, gradually recognize positioning failure source, isolated-phase buses line voltage abnormal conditions differentiate internal fault or external fault, whether occurs exception simultaneously by analysis three-phase current, control system main ring section failure or other link/equipment faults are differentiated, thyristor controlled series compensation is differentiated by the method for calculating current third-harmonic component and controls failure or Reactor Fault.The present invention is capable of the source of trouble of quick analyzing and positioning Static Var Compensator without relying on laboratory testing or fault simulation simulation, has the advantages that accident analysis can be simplified, shortens idle time, improve efficiency, reduce cost, wide adaptation range.
Description
Technical field
The present invention relates to electrical engineering fields, and in particular to a kind of Static Var Compensator thyristor-controlled reactor failure
Analyzing and positioning method.
Background technique
Static Var Compensator (SVC) has been developed as very mature FACTS device, is widely used in modern electricity
The hair of Force system, defeated, distribution links.It is as one of current technology reactive power compensator the most advanced, Static Synchronous
Reactive-load compensator uses the capacitor of large capacity, inductor no longer to generate required reactive power, but passes through power electronics device
The HF switch of part is realized to reactive power compensation technology qualitative leap, is mended especially suitable for the dynamic reactive in median and high voltage power system
It repays.There is no rotary part as a kind of, quickly, smooth controllable dynamic reactive power compensation equipment, Static Var Compensator is
Controllable reactor and power capacitor is used in parallel.The wherein capable of emitting reactive power of capacitor, controlled reactor are absorbable
Reactive power.By the way that reactor is adjusted, it can make whole device smoothly from reactive power change is issued to absorption nothing
Function power, and response quickly.
Core of thyristor-controlled reactor (hereinafter referred to as TCR) branch as Static Var Compensator, existing electricity
Anti- device, and have thyristor controlled series compensation, structure is complicated.A lot of TCR branch reactor damage failures have occurred in recent years.Therefore, it is necessary to
It is a kind of can quick analyzing and positioning SVC Reactor Fault method.The existing analyzing and positioning method for SVC failure is less,
Such as application No. is a kind of SVC analogue simulation dresses based on realtime digital simulation platform of 201120163744.7 patent disclosure
It sets, these detection devices and method are applied to analyzing and positioning SVC failure, must carry out detection or emulation mould under laboratory environment
It is quasi-, it is excessively complicated cumbersome, it is not suitable for the quick analyzing and positioning of SVC failure.
In Static Var Compensator life cycle, the crystalline substance to its core thyristor controlling brancher is unavoidably needed
Brake tube control performance carries out on-site test.Therefore, it is necessary to a kind of simple, effective detections suitable for SVC operation site environment
Device and method.The existing detection method for Static Var Compensator (SVC) is more, but is generally only applicable to laboratory ring
Border, based on the Static Var Compensator of multimode fibre as disclosed in the Chinese patent literature application No. is CN200510102658.4
It is triggered with photoelectricity quiet with a kind of wind power plant disclosed in detection system, the Chinese patent literature application No. is CN201310495202.3
The only parameter detection method of reactive-load compensator and system etc..But these detection devices and method are excessively complicated cumbersome, detection
Environment is higher with site requirements, is not suitable for SVC operation site environment.
Summary of the invention
The technical problem to be solved in the present invention: it in view of the above problems in the prior art, provides a kind of without relying on laboratory
Detection or fault simulation simulation, can the quick analyzing and positioning source of trouble, accident analysis can be simplified, shorten idle time, improve effect
Rate, the Static Var Compensator thyristor-controlled reactor accident analysis localization method for reducing cost, wide adaptation range.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention are as follows:
A kind of Static Var Compensator thyristor-controlled reactor accident analysis localization method, step include:
1) the recording waveform during Static Var Compensator failure is obtained, Static Var Compensator is determined according to recording waveform
TCR branch angle in three-phase current Iab、Ibc、IcaAnd bus line voltage Uab、Ubc、Uca；
2) current waveform is found out according to recording waveform and obvious abnormal timing node T occurs, when comparison judges timing node T
The voltage waveform for carving front and back whether there is significant change, if voltage waveform there are significant change and consistent with current anomaly,
It thens follow the steps 3), otherwise jumps and execute step 4)；
3) whether the variation of investigation voltage waveform is caused by external fault, if it is determined that voltage waveform variation is led for external fault
It causes, then determines the source of trouble of Static Var Compensator failure for external fault and exit；Otherwise, it jumps and executes step 4)；
4) determine that Static Var Compensator failure causes for internal fault, comparison judges the electricity before and after the timing node T moment
Whether there is exception simultaneously to stream waveform in three-phase, jumps if three-phase exception occurs simultaneously and executes step 5)；Otherwise execution is jumped
Step 6)；
5) determine that the source of trouble of Static Var Compensator failure for Static Var Compensator control system main ring section and exits,
The main ring section includes the sampling element of control system, Trigger Angle calculating link and three-phase phase-locked loop section；
6) judge current waveform it is different normally due to Trigger Angle variation cause still due to specified equivalent inductance variation cause, such as
Fruit current waveform it is different normally due to Trigger Angle variation cause, then jump execute step 7), otherwise jump execute step 8)；
7) it determines that Static Var Compensator failure is to control failure by TCR thyristor controlled series compensation to cause, determines static var compensation
The source of trouble of device failure is repaid as the phase-locked loop of the thyristor controlled series compensation of abnormal phase and valve control and abnormal phase and is exited；
8) it determines that Static Var Compensator failure is to be caused by TCR Reactor Fault, determines Static Var Compensator failure
The source of trouble be the reactor body of abnormal phase and exit.
Preferably, the detailed step of the step 6) includes:
6.1) timing node T moment TCR branch exception phase current is obtained into fundametal compoment I' by Fourier transformation0, three
Order harmonic components I'3, the non-abnormal phase current of timing node T moment TCR branch is obtained into fundametal compoment I by Fourier transformation0；
6.2) assume one: Trigger Angle variation causes current anomaly, and abnormal mutually specified equivalent inductance is constant；It is counted according to formula (1)
The evaluation time node T moment is conducted angle α extremely1, further according to formula (2) calculate timing node T moment assume one it is theoretic three times
Harmonic component I'3α；
In formula (1) and (2), α1Indicate that the timing node T moment is conducted angle extremely, I'3αIndicate that the timing node T moment is assumed
One theoretic third-harmonic component, I'0Indicate that timing node T moment TCR branch exception phase current is obtained by Fourier transformation
To fundametal compoment, U indicates that timing node T moment TCR branch bus line voltage virtual value, L indicate that TCR branch is abnormal mutually former specified
Equivalent inductance, ω are frequency；
6.3) assume two: specified equivalent inductance variation causes current anomaly；Firstly, when calculating timing node T according to formula (3)
Carve the angle of flow α of non-abnormal phase0；
In formula (3), I0Indicate that the non-abnormal phase current of timing node T moment TCR branch obtains fundamental wave by Fourier transformation
Component, U indicate timing node T moment TCR branch bus line voltage virtual value, L0Indicate the non-abnormal mutually specified equivalence of TCR branch
Inductance, ω are frequency, α0Indicate the angle of flow of timing node T moment non-abnormal phase.
Assuming that be conducted extremely in two angle and non-exception are conducted, angle is consistent, and the timing node T moment is conducted angle extremely
For α0, timing node T moment abnormal mutually specified equivalent inductance L' is calculated according to formula (4), calculates timing node T further according to formula (5)
Moment assumes two theoretic third-harmonic component I'3L；
In formula (4) and formula (5), L' indicates timing node T moment abnormal mutually specified equivalent inductance, I'3LIndicate timing node T
Moment assumes two theoretic third-harmonic components, α0Indicate the angle of flow of timing node T moment exception phase, I'0Segmentum intercalaris when expression
Point T moment TCR branch exception phase current obtains fundametal compoment by Fourier transformation, and U indicates timing node T moment TCR branch
Bus line voltage virtual value, ω are frequency；
6.4) judge whether condition shown in formula (6) is true, determine that current waveform is different normally due to touching in angle if setting up
Hair angle variation causes, if in angle current waveform it is different normally due to Trigger Angle variation cause, jump execute step 7)；Otherwise it jumps
Turn to execute step 8)；
|I'3α-I'3|<|I'3L-I'3| (6)
In formula (6), I'3αIndicate that the timing node T moment assumes a theoretic third-harmonic component, I'3LSegmentum intercalaris when expression
The point T moment assumes two theoretic third-harmonic components, I'3Indicate that timing node T moment TCR branch exception phase current passes through Fu
In the obtained third-harmonic component of leaf transformation.
Static Var Compensator thyristor-controlled reactor accident analysis localization method of the present invention to during failure by recording
The analytical calculation of wave waveform gradually recognizes positioning failure source, by isolated-phase buses electric voltage exception situation, differentiates internal fault or outer
Portion's failure；Whether occur exception simultaneously by analysis three-phase current, differentiates control system main ring section failure or other link/equipment
Failure can differentiate thyristor controlled series compensation control failure or Reactor Fault, without relying on laboratory testing or fault simulation simulation,
It is capable of the TCR source of trouble of quick analyzing and positioning Static Var Compensator, has an advantage that
1, simplify malfunction analysis procedure.Control system without dismantling Static Var Compensator is carried out laboratory testing or is taken
It builds simulation model and carries out fault simulation, by the analytical calculation to recorder data, quick positioning failure source.
2, shorten equipment idle time.By the quick analyzing and positioning for the source of trouble, trouble unit is replaced, improves failure
Static Var Compensator overhaul of the equipments efficiency shortens equipment idle time.
3, failure investigation efficiency is improved.By the analytical calculation to recorder data, can positioning failure component, if you need into one
Step finds out failure concrete reason, can carry out detection or fault simulation simulation for trouble unit again, effectively shorten entire failure
The time is investigated and analysed, is improved efficiency.
4, trouble hunting cost is reduced.Shorten faulty equipment recovery time and failure investigation analysis time, reduces equipment
The work that laboratory testing, fault simulation are simulated will reduce failure investigation and overhaul of the equipments cost.
5, wide adaptation range.Only need the recordings waveforms such as three-phase current in TCR branch angle, connect bus line voltage, Ji Kekai
Accident analysis positioning is opened up, this is also one of key point of the invention.
6, it detects environment and site requirements is low, be particularly suitable for the operation site environment of Static Var Compensator.
Detailed description of the invention
Fig. 1 is the system structure diagram for being detected Static Var Compensator (prior art).
Fig. 2 is the basic procedure schematic diagram of present invention method.
Fig. 3 is the basic procedure schematic diagram of present invention method step 6).
Specific embodiment
It hereafter will be by taking Static Var Compensator shown in Fig. 1 (SVC) as an example, to Static Var Compensator thyristor control of the present invention
Reactor Fault analyzing and positioning method processed is further described.
Referring to Fig. 1, which includes the three-phase being connected in parallel on the bus of 35kV power circuit respectively
Thyristor controlling brancher, every phase thyristor controlling brancher have 24 thyristor controlled series compensations (valve group is referred to as in Fig. 1), static var compensation
The control system for repaying device is connected with the control terminal of each thyristor controlled series compensation respectively, carries out for controlling three-phase thyristor controlling brancher
Reactive compensation, the control system are split-phase locking phase.There are two Controlled Reactor, every equal value inductance ratings for every phase thyristor control
About 0.0275H (factory measured value).The TCR branch a phase breaks down.
As shown in Fig. 2, the step of the present embodiment Static Var Compensator thyristor-controlled reactor accident analysis localization method
Suddenly include:
1) the recording waveform during Static Var Compensator failure is obtained, Static Var Compensator is determined according to recording waveform
TCR branch angle in three-phase current Iab、Ibc、IcaAnd bus line voltage Uab、Ubc、Uca；
2) current waveform is found out according to recording waveform and obvious abnormal timing node T occurs, when comparison judges timing node T
The voltage waveform for carving front and back whether there is significant change, if voltage waveform there are significant change and consistent with current anomaly,
It thens follow the steps 3), otherwise jumps and execute step 4)；In the present embodiment, there is obvious abnormal, voltage waveform in aforementioned currents waveform
It is to refer to the variable quantity of three-phase current waveform, bus line voltage waveform before and after the timing node T moment in angle there are significant change
Beyond the threshold value provided；
3) whether the variation of investigation voltage waveform is caused by external fault, if it is determined that voltage waveform variation is led for external fault
It causes, then determines the source of trouble of Static Var Compensator failure for external fault and exit；Otherwise, it jumps and executes step 4)；Investigation
Whether voltage waveform variation by external fault when being caused, can inquire the moment whether power grid occur the catastrophe failures such as near region short circuit with
And near region electric network protection action situation, to determine whether voltage waveform variation is that external fault causes；
4) determine that Static Var Compensator failure causes for internal fault, comparison judges the electricity before and after the timing node T moment
Whether there is exception simultaneously to stream waveform in three-phase, jumps if three-phase exception occurs simultaneously and executes step 5)；Otherwise execution is jumped
Step 6)；
5) determine that the source of trouble of Static Var Compensator failure for Static Var Compensator control system main ring section and exits,
The main ring section includes the sampling element of Static Var Compensator control system, Trigger Angle calculating link and three-phase phase-locked loop
Section；After determining the source of trouble for main link, it can check that the sampling element of Static Var Compensator control system, Trigger Angle calculate one by one
Link and three-phase phase-locked loop section, with further positioning failure source；
6) judge current waveform it is different normally due to Trigger Angle variation cause still due to specified equivalent inductance variation cause, such as
Fruit current waveform it is different normally due to Trigger Angle variation cause, then jump execute step 7), otherwise jump execute step 8)；
7) it determines that Static Var Compensator failure is to control failure by TCR thyristor controlled series compensation to cause, determines static var compensation
The source of trouble of device failure is repaid as the phase-locked loop of the thyristor controlled series compensation of abnormal phase and valve control and abnormal phase and is exited；Determine the source of trouble
For after the phase-locked loop of the thyristor controlled series compensation of abnormal phase and valve control and abnormal phase, can check one by one abnormal phase thyristor controlled series compensation and
Valve control, the phase-locked loop with abnormal phase, with further positioning failure source；
8) it determines that Static Var Compensator failure is to be caused by TCR Reactor Fault, determines Static Var Compensator failure
The source of trouble be the reactor body of abnormal phase and exit；After determining reactor body of the source of trouble for abnormal phase, it should check
The reactor body of abnormal phase, emphasis check turn-to-turn short circuit.
As shown in figure 3, the detailed step of step 6) includes:
6.1) timing node T moment TCR branch exception phase current is obtained into fundametal compoment I' by Fourier transformation0, three
Order harmonic components I'3, the non-abnormal phase current of timing node T moment TCR branch is obtained into fundametal compoment I by Fourier transformation0；
6.2) assume one: Trigger Angle variation causes current anomaly, and abnormal mutually specified equivalent inductance is constant；It is counted according to formula (1)
The evaluation time node T moment is conducted angle α extremely1, further according to formula (2) calculate timing node T moment assume one it is theoretic three times
Harmonic component I'3α；
In formula (1) and (2), α1Indicate that the timing node T moment is conducted angle extremely, I'3αIndicate that the timing node T moment is assumed
One theoretic third-harmonic component, I'0Indicate that timing node T moment TCR branch exception phase current is obtained by Fourier transformation
To fundametal compoment, U indicates that timing node T moment TCR branch bus line voltage virtual value, L indicate that TCR branch is abnormal mutually former specified
Equivalent inductance, ω are frequency；
6.3) assume two: specified equivalent inductance variation causes current anomaly；Firstly, when calculating timing node T according to formula (3)
Carve the angle of flow α of non-abnormal phase0；
In formula (3), I0Indicate that the non-abnormal phase current of timing node T moment TCR branch obtains fundamental wave by Fourier transformation
Component, U indicate timing node T moment TCR branch bus line voltage virtual value, L0Indicate the non-abnormal mutually specified equivalence of TCR branch
Inductance, ω are frequency, α0Indicate the angle of flow of timing node T moment non-abnormal phase.
Assuming that be conducted extremely in two angle and non-exception are conducted, angle is consistent, and the timing node T moment is conducted angle extremely
For α0, timing node T moment abnormal mutually specified equivalent inductance L' is calculated according to formula (4), calculates timing node T further according to formula (5)
Moment assumes two theoretic third-harmonic component I'3L；
In formula (4) and formula (5), L' indicates timing node T moment abnormal mutually specified equivalent inductance, I'3LIndicate timing node T
Moment assumes two theoretic third-harmonic components, α0Indicate the angle of flow of timing node T moment exception phase, I'0Segmentum intercalaris when expression
Point T moment TCR branch exception phase current obtains fundametal compoment by Fourier transformation, and U indicates timing node T moment TCR branch
Bus line voltage virtual value, ω are frequency；
6.4) judge whether condition shown in formula (6) is true, determine that current waveform is different normally due to touching in angle if setting up
Hair angle variation causes, if in angle current waveform it is different normally due to Trigger Angle variation cause, jump execute step 7)；Otherwise it jumps
Turn to execute step 8)；
|I'3α-I'3|<|I'3L-I'3| (6)
In formula (6), I'3αIndicate that the timing node T moment assumes a theoretic third-harmonic component, I'3LSegmentum intercalaris when expression
The point T moment assumes two theoretic third-harmonic components, I'3Indicate that timing node T moment TCR branch exception phase current passes through Fu
In the obtained third-harmonic component of leaf transformation.
Referring to Fig. 1, U before and after the T moment in the present embodimentab、Ubc、UcaWithout significant change, it is believed that failure is that internal fault source is drawn
It rises；There was only I before and after the T momentabThere is abnormal, I in waveformbc、IcaWaveform is normal, and investigation failure is led by control system main ring section failure
It causes；U=36kV, I are obtained by recorder data0≈1010A、I'0≈1675A、I'3≈ 580A, according to Static Var Compensator crystalline substance
Brake tube controls reactor simulated failure calculation method, and α is calculated0=130 °, α1≈119°、I'3α≈176A、L'≈
0.0166H、I'3L≈596A；|I'3α-I'3|>|I'3L-I'3|, current anomaly is that the variation of specified equivalent inductance causes.Therefore, recognize
Caused for failure by TCR Reactor Fault.By checking a phase reactor body, reactor interturn short circuit trace is found, it was demonstrated that therefore
It is correct to hinder analyzing and positioning.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of Static Var Compensator thyristor-controlled reactor accident analysis localization method, it is characterised in that step includes:
1) the recording waveform during Static Var Compensator failure is obtained, Static Var Compensator is determined according to recording waveform
Three-phase current I in the angle of TCR branchab、Ibc、IcaAnd bus line voltage Uab、Ubc、Uca；
2) current waveform is found out according to recording waveform and obvious abnormal timing node T occurs, before comparison judges the timing node T moment
Voltage waveform afterwards whether there is significant change, if there are significant changes and consistent with current anomaly for voltage waveform, hold
Row step 3) otherwise jumps and executes step 4)；
3) whether the variation of investigation voltage waveform is caused by external fault, if it is determined that and voltage waveform variation causes for external fault,
Determine the source of trouble of Static Var Compensator failure then for external fault and exits；Otherwise, it jumps and executes step 4)；
4) determine that Static Var Compensator failure causes for internal fault, comparison judges the current wave before and after the timing node T moment
Whether there is exception simultaneously to shape in three-phase, jumps if three-phase exception occurs simultaneously and executes step 5)；Otherwise execution step is jumped
6)；
5) determine that the source of trouble of Static Var Compensator failure for Static Var Compensator control system main ring section and exits, it is described
Main ring section includes the sampling element of control system, Trigger Angle calculating link and three-phase phase-locked loop section；
6) judge current waveform it is different normally due to Trigger Angle variation cause still due to specified equivalent inductance variation cause, if electric
Stream Wave anomaly is then to jump since Trigger Angle variation causes and execute step 7), otherwise jump and execute step 8)；
7) it determines that Static Var Compensator failure is to control failure by TCR thyristor controlled series compensation to cause, determines Static Var Compensator
The source of trouble of failure is the phase-locked loop of the thyristor controlled series compensation of abnormal phase and valve control and abnormal phase and exits；
8) it determines that Static Var Compensator failure is to be caused by TCR Reactor Fault, determines the event of Static Var Compensator failure
Barrier source is the reactor body of abnormal phase and exits；
The detailed step of the step 6) includes:
6.1) timing node T moment TCR branch exception phase current is obtained into fundametal compoment I ' by Fourier transformation0, triple-frequency harmonics
Component I '3, the non-abnormal phase current of timing node T moment TCR branch is obtained into fundametal compoment I by Fourier transformation0；
6.2) assume one: Trigger Angle variation causes current anomaly, and abnormal mutually specified equivalent inductance is constant；When being calculated according to formula (1)
The intermediate node T moment is conducted angle α extremely1, a theoretic triple-frequency harmonics is assumed further according to formula (2) calculating timing node T moment
Component I '3α；
In formula (1) and (2), α1Indicate that the timing node T moment is conducted angle extremely, I '3αIndicate that the timing node T moment assumes a reason
By upper third-harmonic component, I '0Indicate that timing node T moment TCR branch exception phase current obtains base by Fourier transformation
Wave component, U indicate that timing node T moment TCR branch bus line voltage virtual value, L indicate the abnormal mutually former specified equivalence of TCR branch
Inductance, ω are frequency；
6.3) assume two: specified equivalent inductance variation causes current anomaly；Firstly, it is non-to calculate the timing node T moment according to formula (3)
The angle of flow α of abnormal phase0；
In formula (3), I0Indicate that the non-abnormal phase current of timing node T moment TCR branch obtains fundametal compoment, U by Fourier transformation
Indicate timing node T moment TCR branch bus line voltage virtual value, L0Indicate the non-abnormal mutually specified equivalent inductance of TCR branch, ω
For frequency, α0Indicate the angle of flow of timing node T moment non-abnormal phase；
Assuming that be conducted extremely in two angle and non-exception are conducted, angle is consistent, and the timing node T moment angle that is conducted extremely is also α0,
Timing node T moment abnormal mutually specified equivalent inductance L ' is calculated according to formula (4), calculates timing node T moment vacation further according to formula (5)
If two theoretic third-harmonic component I '3L；
In formula (4) and formula (5), L ' expression timing node T moment abnormal mutually specified equivalent inductance, I '3LIndicate the timing node T moment
Assuming that two theoretic third-harmonic components, α0Indicate the angle of flow of timing node T moment exception phase, I '0Indicate timing node T
Moment TCR branch exception phase current obtains fundametal compoment by Fourier transformation, and U indicates timing node T moment TCR branch bus
Line voltage virtual value, ω are frequency；
6.4) judge whether condition shown in formula (6) is true, determine that current waveform is different normally due to Trigger Angle in angle if setting up
Variation causes, if in angle current waveform it is different normally due to Trigger Angle variation cause, jump execute step 7)；Otherwise it jumps and holds
Row step 8)；
|I′3α-I′3|<|I′3L-I′3| (6)
In formula (6), I '3αIndicate that the timing node T moment assumes a theoretic third-harmonic component, I '3LWhen indicating timing node T
It carves and assumes two theoretic third-harmonic components, I '3Indicate that timing node T moment TCR branch exception phase current passes through Fourier
Convert obtained third-harmonic component.
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| CN111736093B (en) * | 2020-07-20 | 2020-12-22 | 南京电气(集团)智能电力设备有限公司 | Phase control reactor turn-to-turn fault identification method based on 3-order harmonic wave and active loss |
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| RU2160953C2 (en) * | 1999-02-11 | 2000-12-20 | Брянцев Александр Михайлович | Method for single-phase fault detection in low- voltage line including ground-fault current correction (alternatives) |
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| US9696367B2 (en) * | 2012-05-11 | 2017-07-04 | Howard University | Apparatus and method of fault detection and location determination |
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