CN110470947A - A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system - Google Patents
A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system Download PDFInfo
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- CN110470947A CN110470947A CN201910752644.9A CN201910752644A CN110470947A CN 110470947 A CN110470947 A CN 110470947A CN 201910752644 A CN201910752644 A CN 201910752644A CN 110470947 A CN110470947 A CN 110470947A
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- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
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- 238000010586 diagram Methods 0.000 description 2
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
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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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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Abstract
The invention discloses a kind of ground electrode circuit fault distance-finding methods suitable for MMC direct current system, identify ground electrode circuit failure, start harmonic；It calculates upper and lower bridge arm at this time and should be at the submodule quantity of investment state；By the amendment to investment submodule quantity, so that generating frequency on DC line is 1/TcAC harmonic component；Monitor operating status of the MMC direct current system in harmonic whether safety and stability；Obtain change of current side voltageChange of current side electric current Calculate change of current side voltage component in the same directionThe component in the same direction and reversed component of change of current side electric currentObtain fault point voltage and electric currentAbout the expression formula of fault distance x, range equation is solvedFailure can be accurately positioned.Compared with prior art, the present invention is not influenced from principle by transition resistance and fault distance, can be realized the accurate ranging in high resistant and near terminal fault；In addition, being not required to increase additional sender unit on the line, the requirement to sample rate can also be greatly reduced.
Description
Technical field
The present invention relates to line fault of electrical power system protection and control technology field, in particular to a kind of ground electrode circuit event
Hinder the distance measuring method of position.
Background technique
As shown in Figure 1, being the very bipolar MMC direct current system model schematic of current both-end.Earthing pole is its important composition
Part, line fault, which occurs, for earthing pole will lead to converter station locking.Since natural zero-crossing point is not present in direct-current arc, it is not easy to put out
It goes out, needs ability blow-out that direct current system is stopped transport, therefore, determine that abort situation, rapidly removing faults can effectively improve and be in time
System stability.The problem of ground electrode circuit failure is must be taken into consideration in the construction of MMC DC engineering is accurately positioned.Currently, being directed to
The distance measuring method that ground electrode circuit failure is proposed is less, and existing method is difficult to take under the operating conditions such as high resistance ground, near-end ground
Obtain preferable ranging effect.For this status, it is necessary to propose a kind of accurate and effective ground electrode circuit fault localization side
Method.
Summary of the invention
Aiming at the problem that determining abort situation after ground electrode circuit in MMC direct current system breaks down, the invention proposes
A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system, by respectively mutually putting into submodule number to MMC converter station
The control of amount injects AC harmonic component on DC line, makes the harmonic component in ground electrode circuit containing identical frequency, right
Ground electrode circuit head end voltage, electric current measure, and solve range equation using measurement result, solve fault distance, realize
A kind of novel distance measuring method for capableing of accurate judgement abort situation.
A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system of the invention is applied to include the change of current
It stands the MMC direct current system of side J, earth electrode field side K and fault point F, which is characterized in that specific step is as follows for the system, method:
Step 1, identification ground electrode circuit failure, start harmonic, harmonic period Tc, and set and start to inject moment t
For 0 moment；
Step 2, the upper and lower bridge arm of calculating should be at the submodule quantity N of investment state at this timeuN、NdN；
If step 3,Wherein, t indicates moment, TcIndicate the note of setting
Enter the period of AC harmonic), correct the submodule quantity N that upper and lower bridge arm is practically in investment state at this timeu、NdRespectively half cycle
Submodule quantity N is put into phaseu=NuN-m、Nd=NdN-m；Otherwise, enabling quantity in the half period is Nu=NuN、Nd=NdN；By right
The amendment of submodule quantity is put into, so that generating frequency on DC line is 1/TcAC harmonic component, the injection of harmonic wave
With Nu、NdCyclically-varying and controlled；
Step 4, operating status of the monitoring MMC direct current system in harmonic whether safety and stability: acquisition DC line
Voltage and current signals, when the voltage fluctuation of DC line be no more than 5% when, MMC direct current system safety and stability can continue to infuse
Enter；If the voltage fluctuation of DC line is more than 5%, stop injection immediately to avoid MMC direct current system unstability；
Step 5, the voltage and current signals for acquiring ground electrode circuit head end；
Step 6 is filtered using voltage and current signals of the bandpass filter to ground electrode circuit head end, is obtained
Sinusoidal ac signal；
Step 7 carries out FFT transform to AC signal, obtains change of current side voltageI, II loop line road change of current side electric current
Step 8 calculates change of current side voltage component in the same directionThe component in the same direction and reversed component of change of current side electric current
Step 9, characteristic impedance and the propagation constant Z for reading in ground electrode circuit network in the same direction and reversed network0c、Z0d、γc、
γd；
Step 10 obtains fault point voltage and electric currentExpression formula about fault distance x:
Step 11 passes through solution range equationFault point F is obtained away from converter station distance, i.e. fault distance
X, x indicate the distance of F distance line head end J at failure, and route head end J is fault distance starting point, and F is fault distance at failure
Terminal.
Compared with prior art, the present invention is not influenced from principle by transition resistance and fault distance, can be realized
Accurate ranging when high resistant and near terminal fault；In addition, being not required to increase additional sender unit change route knot on the line
Structure, the requirement to sample rate can also be greatly reduced.
Detailed description of the invention
Fig. 1 is both-end MMC direct current system model schematic；
Fig. 2 is earthing pole double line down network diagram；
Fig. 3 is that a kind of ground electrode circuit fault distance-finding method overall flow suitable for MMC direct current system of the invention is shown
It is intended to.
Specific embodiment
Technical solution of the present invention is described in detail with reference to the accompanying drawings and examples.
A kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system of the invention, by MMC converter station
Each control for mutually putting into submodule quantity, actively injects AC harmonic component on DC line, to produce in ground electrode circuit
The raw harmonic component containing identical frequency by measuring to ground electrode circuit head end voltage, electric current, and utilizes measurement result
Range equation is solved, failure can be accurately positioned.
As shown in Fig. 2, being the earthing pole double-circuit line fault network schematic diagram of the embodiment of the present invention.Wherein, J is converter station
Side, K are earth electrode field side, and F is fault point；RFFor ground resistance at failure, REFor earth electrode field resistance, l is that route is long
Degree, x are fault point F away from converter station distance,Respectively fault point voltage and electric current phasor, I, II respectively indicate I,
II loop line road, in figure by taking failure occurs on Section II loop line road as an example.
As shown in figure 3, being a kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system of the invention, tool
Steps are as follows for body:
Step 1 identifies failure by the protection of ground electrode circuit current imbalance, ground electrode circuit overcurrent protection etc., starts
Harmonic, harmonic period Tc, and set and start to inject moment t as 0 moment (t=0)；
Step 2, the upper and lower bridge arm of calculating should be at the submodule quantity N of investment state at this timeuN、NdN, NuN、NdNIndicate root
The submodule quantity that resulting upper and lower bridge arm should be put into respectively is calculated according to common " nearest level approaches modulation " mode, is injected humorous
Wave is specifically to be realized according to the amendment to this quantity；
If step 3,T indicates moment, TcIndicate that the injection of setting is handed over
In the period for flowing harmonic wave, refer to the duplicate interval of sine wave, wherein investment submodule quantity is N in the half periodu=NuN-m、Nd=NdN-
M, enabling quantity in the another half period is Nu=NuN、Nd=NdN, by controlling Nu、NdCyclically-varying, realize the injection of harmonic wave), repair
Just upper and lower bridge arm is practically in the submodule quantity N of investment state at this timeu、NdRespectively Nu=NuN-m、Nd=NdN-m；Otherwise,
Enable Nu=NuN、Nd=NdN；By the amendment to investment submodule quantity, so that generating frequency on DC line is 1/TcFriendship
Flow harmonic component；
Step 4, operating status of the monitoring MMC direct current system in harmonic whether safety and stability: acquisition DC line
Voltage and current signals, when the voltage fluctuation of DC line be no more than 5% when, MMC direct current system safety and stability can continue to infuse
Enter；If the voltage fluctuation of DC line is more than 5%, stop injection immediately to avoid MMC direct current system unstability；
Step 5, the voltage and current signals for acquiring ground electrode circuit head end；
Step 6 is filtered using voltage and current signals of the bandpass filter to ground electrode circuit head end, is obtained
Sinusoidal ac signal；
Step 7 carries out FFT transform to AC signal, obtains change of current side voltageChange of current side electric currentSubscript 1,
2 respectively indicate the I of double back ground electrode circuit, II loop line road；
Step 8 calculates change of current side voltage component in the same directionThe component in the same direction and reversed component of change of current side electric current
Step 9, characteristic impedance and the propagation constant Z for reading in ground electrode circuit network in the same direction and reversed network0c、Z0d、γc、
γd；
Step 10 obtains fault point voltage and electric currentExpression formula about fault distance x:
Step 11 passes through solution range equationFault point F is obtained away from converter station distance, i.e. fault distance
X, fault distance x indicate the distance of F distance line head end J at failure, and route head end J is fault distance starting point, and F is at failure
Fault distance terminal.
Claims (1)
1. a kind of ground electrode circuit fault distance-finding method suitable for MMC direct current system is applied to comprising converter station side J, ground connection
The MMC direct current system of pole pole location side K and fault point F, which is characterized in that specific step is as follows for the system, method:
Step 1, identification ground electrode circuit failure, start harmonic, harmonic period Tc, and set when starting to inject moment t as 0
It carves；
Step 2, the upper and lower bridge arm of calculating should be at the submodule quantity N of investment state at this timeuN、NdN；
If step 3,(n=0,1,2 ..., nmax, wherein t indicates moment, TcIndicate that the injection of setting is handed over
Flow the period of harmonic wave), correct the submodule quantity N that upper and lower bridge arm is practically in investment state at this timeu、NdRespectively in the half period
Put into submodule quantity Nu=NuN-m、Nd=NdN-m；Otherwise, enabling quantity in the half period is Nu=NuN、Nd=NdN；By to investment
The amendment of submodule quantity, so that generating frequency on DC line is 1/TcAC harmonic component, the injection of harmonic wave with
Nu、NdCyclically-varying and controlled；
Step 4, operating status of the monitoring MMC direct current system in harmonic whether safety and stability: acquire the electricity of DC line
Pressure and current signal, when the voltage fluctuation of DC line is no more than 5%, MMC direct current system safety and stability can continue to inject；
If the voltage fluctuation of DC line is more than 5%, stop injection immediately to avoid MMC direct current system unstability；
Step 5, the voltage and current signals for acquiring ground electrode circuit head end；
Step 6 is filtered using voltage and current signals of the bandpass filter to ground electrode circuit head end, is obtained sinusoidal
AC signal；
Step 7 carries out FFT transform to AC signal, obtains change of current side voltageI, II loop line road change of current side electric current
Step 8 calculates change of current side voltage component in the same directionThe component in the same direction and reversed component of change of current side electric current
Step 9, characteristic impedance and the propagation constant Z for reading in ground electrode circuit network in the same direction and reversed network0c、Z0d、γc、γd；
Step 10 obtains fault point voltage and electric currentExpression formula about fault distance x:
Step 11 passes through solution range equationFault point F is obtained away from converter station distance, i.e. fault distance x, x table
Show the distance of F distance line head end J at failure, route head end J is fault distance starting point, and F is fault distance terminal at failure.
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Cited By (4)
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| CN111289916A (en) * | 2020-03-10 | 2020-06-16 | 华北电力大学 | Photovoltaic direct current sending-out system fault location method based on boundary resonance identification |
| CN113466605A (en) * | 2021-05-07 | 2021-10-01 | 中国矿业大学 | MMC (Modular multilevel converter) -based pseudo-random code fault distance measurement method and system |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
| CN113567808A (en) * | 2021-07-26 | 2021-10-29 | 华北电力大学 | Unified power flow controller access line fault positioning method and system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289916A (en) * | 2020-03-10 | 2020-06-16 | 华北电力大学 | Photovoltaic direct current sending-out system fault location method based on boundary resonance identification |
| CN111289916B (en) * | 2020-03-10 | 2021-05-25 | 华北电力大学 | Photovoltaic direct current sending-out system fault location method based on boundary resonance identification |
| CN113466605A (en) * | 2021-05-07 | 2021-10-01 | 中国矿业大学 | MMC (Modular multilevel converter) -based pseudo-random code fault distance measurement method and system |
| CN113466605B (en) * | 2021-05-07 | 2022-08-05 | 中国矿业大学 | MMC (Modular multilevel converter) -based pseudo-random code fault distance measurement method and system |
| CN113484682A (en) * | 2021-07-15 | 2021-10-08 | 保定市毅格通信自动化有限公司 | Distribution line ground fault distance measurement method based on standing wave |
| CN113567808A (en) * | 2021-07-26 | 2021-10-29 | 华北电力大学 | Unified power flow controller access line fault positioning method and system |
| CN113567808B (en) * | 2021-07-26 | 2022-06-28 | 华北电力大学 | Unified power flow controller access line fault positioning method and system |
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