CN107064737A - MMC HVDC transmission line fault detection methods based on mutation power - Google Patents
MMC HVDC transmission line fault detection methods based on mutation power Download PDFInfo
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- CN107064737A CN107064737A CN201710188390.3A CN201710188390A CN107064737A CN 107064737 A CN107064737 A CN 107064737A CN 201710188390 A CN201710188390 A CN 201710188390A CN 107064737 A CN107064737 A CN 107064737A
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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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- Direct Current Feeding And Distribution (AREA)
Abstract
A kind of MMC HVDC transmission line fault detection methods based on mutation power, monitoring point is set by the rectification side both positive and negative polarity in MMC HVDC transmission systems, inverter side both positive and negative polarity；And calculate the mutation power at each monitoring point; breakdown judge is carried out according to DC side failure criterion; moving average filter is carried out to mutation power when for DC side failure and rectification side failure is set up selecting pole criterion and inverter side failure to select pole criterion to carry out fault diagnosis, present invention protection quick-action is good；Power absolute value is mutated during monopolar grounding fault greatly and in theory not by transition Resistance Influence, the problem of current MMC HVDC DC lines current differential protection reliably can not reflect monopolar grounding fault is solved.
Description
Technical field
The present invention relates to a kind of technology of electrical distribution field, specifically a kind of MMC-HVDC based on mutation power
Electric transmission line fault detection method.
Background technology
Modular multilevel converter type HVDC (MMC-HVDC) transmission system has output quality of power supply height, the change of current
Device loss it is low, be easy to extension and system reliability it is high the advantages of, it has also become the main way of realization of flexible DC power transmission.It is flexible straight
Flow transmission line of electricity wide across region, fault rate is high, and excessively stream or overpressure problems are frequently accompanied by during failure generation, converter valve is made
Into impacting and influence the safety and stability of AC system.Compared with two level and three-level voltage source transverter, modular multilevel
Transverter (MMC) DC side causes the flexible direct current power transmission system fault transient feature based on MMC obvious not without bulky capacitor in parallel
Together, you can the borderline properties applied to protection greatly reduce, DC side monopolar grounding fault when without obvious fault electric current etc..
The content of the invention
The present invention occur monopole ground connection because of MMC-HVDC system dcs circuit for current differential protection in the prior art therefore
The defects such as action message are unable to without obvious fault electric current during barrier, a kind of MMC-HVDC transmission lines of electricity event based on mutation power is proposed
Hinder detection method.
The present invention is achieved by the following technical solutions：
The present invention relates to a kind of MMC-HVDC electric transmission line fault detection methods based on mutation power, including following step
Suddenly：
1) rectification side both positive and negative polarity, inverter side both positive and negative polarity in MMC-HVDC transmission systems sets monitoring point；
2) the mutation power at each monitoring point is calculated；
3) breakdown judge is carried out according to DC side failure criterion, step 4 is performed when for DC side failure, step is otherwise returned to
Rapid 2；
4) moving average filter is carried out to mutation power；
5) setting up rectification side failure selects pole criterion and inverter side failure to select pole criterion to carry out fault diagnosis.
Described step 2) specifically include following steps：
2.1) rectification side positive pole mutation power is calculatedWherein：UdcIt is straight when normally being run for system
The positive and negative voltage across poles of Flow Line, IdcDC line electric current when normally being run for system；
2.2) rectification side negative pole mutation power is calculated
2.3) inverter side positive pole mutation power is calculated
2.4) inverter side negative pole mutation power is calculated
Described DC side failure criterion isWherein：Δ P is the mutation work(at monitoring point
Rate, k is last samples moment, TsFor sampling period, PrsetFor threshold value.
Described rectification side failure selects the pole criterion to beWherein：Δ
PKpfWith Δ PKnfFor the mutation power after moving average filter.
Described inverter side failure selects the pole criterion to beWherein：Δ
PMpfWith Δ PMnfFor the mutation power after moving average filter.
Technique effect
Compared with prior art, the present invention is using mutation power variation rate detection DC side failure, and protection quick-action is good；It is single
Power absolute value is mutated during pole ground fault greatly and in theory not by transition Resistance Influence, current MMC-HVDC AC lines are solved
The problem of road current differential protection reliably can not reflect monopolar grounding fault.
Brief description of the drawings
Fig. 1 is MMC-HVDC system structure diagrams；
Fig. 2 is schematic flow sheet of the present invention；
Fig. 3 is monopolar grounding fault schematic diagram；
Fig. 4 is bipolar short trouble schematic diagram.
Embodiment
As shown in figure 1, in the present embodiment, MMC-HVDC systems are mainly made up of converting plant, Inverter Station and DC line.Two
Side current conversion station is the MMC using half-bridge submodule (SM), and DC side grounding resistance R is used to construct earth point as zero potential
Point.K sides represent rectification side, and M sides represent inverter side, uKpAnd uKnFor the positive and negative electrode voltage at K ends, iKpAnd iKnBe respectively K ends just,
Cathodal current, uMpAnd uMnFor the positive and negative electrode voltage at M ends, iMpAnd iMnIt is the positive and negative electrode electric current at M ends respectively.uKAnd uMIt is K respectively
The positive and negative voltage across poles in side and M sides.f1、f2For AC abort situation, f3For DC side abort situation.
As shown in Fig. 2 the MMC-HVDC electric transmission line fault detection methods of this implementation comprise the following steps：
1) rectification side both positive and negative polarity, inverter side both positive and negative polarity in MMC-HVDC transmission systems sets monitoring point.
2) the mutation power at each monitoring point is calculated.
2.1) rectification side positive pole mutation power is calculatedWherein：UdcIt is straight when normally being run for system
The positive and negative voltage across poles of Flow Line, IdcDC line electric current when normally being run for system.
2.2) rectification side negative pole mutation power is calculated
2.3) inverter side positive pole mutation power is calculated
2.4) inverter side negative pole mutation power is calculated
3) breakdown judge is carried out according to DC side failure criterion, step 4 is carried out if the failure for DC side).
Described DC side failure criterion isWherein：Δ P is the mutation work(at monitoring point
Rate, k is last samples moment, TsFor sampling period, PrsetFor threshold value.
4) moving average filter is carried out to mutation power.Using moving average filter obtain Sudden Changing Rate power low frequency into
Divide to filter out the high fdrequency component of line distribution capacitance generation.It is filtered to be output as：Δ P is four monitorings
Mutation power at point, N is the sampled point number in 5ms time windows.
5) setting up rectification side failure selects pole criterion and inverter side failure to select pole criterion to carry out fault diagnosis.
As shown in figure 3, during monopolar grounding fault, failure pole voltage-to-ground is zero, non-faulting pole voltage-to-ground is doubled, positive and negative
The voltage difference of interpolar keeps constant, and DC line electric current keeps constant, that is, when obtaining plus earth failure
During negative pole earth fault
As shown in figure 4, after the bipolar short trouble of DC line occurs, successively undergoing energy-storage travelling wave tube discharge regime and alternating current
Flow injection stage.Energy-storage travelling wave tube discharge regime, transverter not yet locking, bridge arm reactor and the submodule electricity in input state
Hold and DC side is discharged simultaneously.After converter blocking, both sides AC network still can be by submodule lower diode to straight
Flow Line short dot injects short circuit current flow, and both sides AC network is equivalent to generation three-phase shortcircuit.The bipolar short trouble of DC line
During generation
Described rectification side failure selects the pole criterion to beWherein：Δ
PKpfWith Δ PKnfFor the mutation power after moving average filter.Inverter side failure selects the pole criterion to beWherein：ΔPMpfWith Δ PMnfFor the mutation work(after moving average filter
Rate, Pset=0.1UdcIdc.Pole criterion, failure judgement pole and fault type are selected by failure.
Compared with prior art, the present invention is using mutation power variation rate detection DC side failure, and protection quick-action is good；It is single
Power absolute value is mutated during pole ground fault greatly and in theory not by transition Resistance Influence, current MMC-HVDC AC lines are solved
The problem of road current differential protection reliably can not reflect monopolar grounding fault.
Above-mentioned specific implementation can by those skilled in the art on the premise of without departing substantially from the principle of the invention and objective with difference
Mode local directed complete set is carried out to it, protection scope of the present invention is defined by claims and not by above-mentioned specific implementation institute
Limit, each implementation in the range of it is by the constraint of the present invention.
Claims (5)
1. a kind of MMC-HVDC electric transmission line fault detection methods based on mutation power, it is characterised in that comprise the following steps：
1) rectification side both positive and negative polarity, inverter side both positive and negative polarity in MMC-HVDC transmission systems sets monitoring point；
2) the mutation power at each monitoring point is calculated；
3) breakdown judge is carried out according to DC side failure criterion, step 4 is performed when for DC side failure, step 2 is otherwise returned to；
4) moving average filter is carried out to mutation power；
5) setting up rectification side failure selects pole criterion and inverter side failure to select pole criterion to carry out fault diagnosis.
2. the MMC-HVDC transmission line malfunction diagnostic methods according to claim 1 based on mutation power, it is characterized in that,
Described step 2) specifically include following steps：
2.1) rectification side positive pole mutation power is calculatedWherein：UdcAC line when normally being run for system
The positive and negative voltage across poles in road, IdcDC line electric current when normally being run for system；
2.2) rectification side negative pole mutation power is calculated
2.3) inverter side positive pole mutation power is calculated
2.4) inverter side negative pole mutation power is calculated
3. the MMC-HVDC transmission line malfunction diagnostic methods according to claim 2 based on mutation power, it is characterized in that,
Described DC side failure criterion isWherein：Δ P is the mutation power at monitoring point, and k is most
New sampling instant, TsFor sampling period, PrsetFor threshold value.
4. the MMC-HVDC transmission line malfunction diagnostic methods according to claim 3 based on mutation power, it is characterized in that,
Described rectification side failure selects the pole criterion to beWherein：ΔPKpfWith Δ PKnf
For the mutation power after moving average filter.
5. the MMC-HVDC transmission line malfunction diagnostic methods according to claim 4 based on mutation power, it is characterized in that,
Described inverter side failure selects the pole criterion to beWherein：ΔPMpfAnd Δ
PMnfFor the mutation power after moving average filter.
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Cited By (8)
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|---|---|---|---|---|
| CN108469557A (en) * | 2018-03-07 | 2018-08-31 | 西南交通大学 | High voltage direct current transmission device Fault Locating Method based on transverter differential protection |
| CN109188191A (en) * | 2018-07-24 | 2019-01-11 | 国网山西省电力公司电力科学研究院 | Based on chugging amount half-wavelength transmission line of alternation current fast failure phase-selecting method |
| CN110231540A (en) * | 2019-06-04 | 2019-09-13 | 西安交通大学 | One kind is for pseudo- bipolar DC electric line monopolar grounding fault positioning system |
| CN110907753A (en) * | 2019-12-02 | 2020-03-24 | 昆明理工大学 | HHT energy entropy based MMC-HVDC system single-ended fault identification method |
| CN110927646A (en) * | 2019-11-05 | 2020-03-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for positioning abnormal fault of direct-current voltage measurement of high-voltage direct-current power transmission system |
| CN111398851A (en) * | 2020-03-30 | 2020-07-10 | 云南电网有限责任公司电力科学研究院 | MMC-HVDC direct current transmission line fault detection method |
| CN111856322A (en) * | 2020-05-09 | 2020-10-30 | 上海交通大学 | Direct-current distribution network bipolar short-circuit fault accurate positioning method and device based on MMC |
| CN112904142A (en) * | 2021-01-19 | 2021-06-04 | 国网江苏省电力有限公司徐州供电分公司 | Single-pole ground fault protection method for direct-current power distribution network grounded through clamping resistor |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108469557A (en) * | 2018-03-07 | 2018-08-31 | 西南交通大学 | High voltage direct current transmission device Fault Locating Method based on transverter differential protection |
| CN108469557B (en) * | 2018-03-07 | 2019-03-15 | 西南交通大学 | High voltage direct current transmission device Fault Locating Method based on inverter differential protection |
| CN109188191A (en) * | 2018-07-24 | 2019-01-11 | 国网山西省电力公司电力科学研究院 | Based on chugging amount half-wavelength transmission line of alternation current fast failure phase-selecting method |
| CN109188191B (en) * | 2018-07-24 | 2021-01-19 | 国网山西省电力公司电力科学研究院 | Rapid fault phase selection method for half-wavelength alternating-current transmission line based on power mutation |
| CN110231540A (en) * | 2019-06-04 | 2019-09-13 | 西安交通大学 | One kind is for pseudo- bipolar DC electric line monopolar grounding fault positioning system |
| CN110927646A (en) * | 2019-11-05 | 2020-03-27 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Method for positioning abnormal fault of direct-current voltage measurement of high-voltage direct-current power transmission system |
| CN110907753A (en) * | 2019-12-02 | 2020-03-24 | 昆明理工大学 | HHT energy entropy based MMC-HVDC system single-ended fault identification method |
| CN110907753B (en) * | 2019-12-02 | 2021-07-13 | 昆明理工大学 | HHT energy entropy based MMC-HVDC system single-ended fault identification method |
| CN111398851A (en) * | 2020-03-30 | 2020-07-10 | 云南电网有限责任公司电力科学研究院 | MMC-HVDC direct current transmission line fault detection method |
| CN111856322A (en) * | 2020-05-09 | 2020-10-30 | 上海交通大学 | Direct-current distribution network bipolar short-circuit fault accurate positioning method and device based on MMC |
| CN112904142A (en) * | 2021-01-19 | 2021-06-04 | 国网江苏省电力有限公司徐州供电分公司 | Single-pole ground fault protection method for direct-current power distribution network grounded through clamping resistor |
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