CN107478950A - A kind of discrimination method of the bipolar short trouble of DC line - Google Patents
A kind of discrimination method of the bipolar short trouble of DC line Download PDFInfo
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- CN107478950A CN107478950A CN201710632887.XA CN201710632887A CN107478950A CN 107478950 A CN107478950 A CN 107478950A CN 201710632887 A CN201710632887 A CN 201710632887A CN 107478950 A CN107478950 A CN 107478950A
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- negative electrode
- current
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- short trouble
- fault identification
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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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- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
Abstract
The present invention relates to a kind of discrimination method of the bipolar short trouble of DC line, including：Negative bus voltage, electric current, voltage change ratio and current changing rate；Judge whether positive and negative electrode busbar voltage rate of change and current changing rate meet the fault identification anticipation condition of setting；If meeting, fault identification prejudges condition, judges whether positive and negative electrode busbar voltage and electric current meet the fault identification criterion of setting；If meeting fault identification criterion, bipolar short trouble occurs for decision-making system.It is of the invention first to be judged in advance according to whether positive and negative electrode busbar voltage rate of change and current changing rate occur bipolar short trouble to system, further determine that whether system occurs bipolar short trouble by positive and negative electrode busbar voltage, electric current again, fault identification can be completed rapidly and accurately in 0.1ms, quick, the requirement that accurately detects to the bipolar short trouble of dc circuit breaker DC line can be met.
Description
Technical field
The present invention relates to a kind of discrimination method of the bipolar short trouble of DC line, belongs to power system HVDC Transmission Technology
Field.
Background technology
With development of the VSC-HVDC technology of transmission of electricitys to VSC-HVDC power networks, reliability to whole system and stably, peace
Row for the national games it is also proposed higher requirement.The huge challenge wherein faced is exactly cut-offfing for VSC-HVDC power network short circuit currents
Problem.Compared with AC system, time constant is small in VSC-HVDC power networks, and the increasing rate of short circuit current is fast, while causes direct current
Voltage falls, or even causes the out of control of transverter and short circuit current, and DC current is difficult due to lacking natural zero-crossing point
To cut-off.The high voltage DC breaker of quick excision or isolation short trouble can be realized as VSC-HVDC power network developments
Bottleneck problem.
Combining the hybrid high voltage DC breaker of mechanical breaker and electronic power switch at present turns into the heat studied
Point, its on-state loss is relatively low, and has breaking speed quickly simultaneously, and the current-off time under line fault only needs 3ms,
It is worth with practical engineering application.
Fast shut-off line fault electric current is needed when DC line fault occurs, it is desirable to DC line is completed in 0.1ms
Quick fault testing, and output protection action signal completes the separating brake of dc circuit breaker.Therefore dc circuit breaker line fault
While detection needs rapidity, also need possess reliability, prevent failure error detection and cause the mistake disjunction of breaker.
To flexible direct current power transmission system, when the generation of bipolarity short trouble is same in converter valve exit, positive and negative busbar voltage
When be reduced rapidly to zero or so, fault current shows as first being down to zero is quickly reversed increase again.Publication No. is CN104820159A
Chinese patent document disclose a kind of flexible direct current power transmission system DC bipolar short trouble discrimination method, this method is according to double
Voltage, the variation characteristic of electric current determine the generation of double-pole cut-out failure during extremely short road fault progression, sentence according to this method
Making failure needs 10ms or so time, it is clear that can not meet that dc circuit breaker is small to circuit DC line fault detection time
In 0.1ms requirements.
The content of the invention
It is an object of the invention to provide a kind of discrimination method of the bipolar short trouble of DC line, for solving prior art
In the speed of bipolar short trouble identification can not meet this technical problem of application demand more slowly.
In order to solve the above technical problems, the invention provides a kind of discrimination method of the bipolar short trouble of DC line, bag
Include following steps：
Obtain positive and negative electrode busbar voltage, electric current, voltage change ratio and current changing rate；
Judge whether positive and negative electrode busbar voltage rate of change and current changing rate meet the fault identification anticipation condition of setting；
If meeting, fault identification prejudges condition, judges whether positive and negative electrode busbar voltage and electric current meet that the failure of setting is distinguished
Know criterion；
If meeting fault identification criterion, bipolar short trouble occurs for decision-making system.
Further, the fault identification anticipation condition is：
Maximum in the absolute value of both positive and negative electrode busbar voltage transformation rates is more than DC voltage change rate threshold value, or
Maximum in the absolute value of both person's positive and negative electrode bus current rates of change is more than DC current rate of change threshold value.
Further, the fault identification criterion is：
(1) absolute value of both positive and negative electrode busbar voltages is no more than direct current voltage-to-ground minimum threshold；
(2) maximum in the absolute value of both positive and negative electrode bus currents is not less than DC current max-thresholds or positive and negative
The minimum value of the absolute value of both pole bus currents is not more than DC current minimum threshold.
The beneficial effects of the invention are as follows：
By judging whether positive and negative electrode busbar voltage rate of change and current changing rate meet that the fault identification of setting prejudges bar
Part, whether bipolar short trouble is first occurred to system and is judged in advance, illustrate system very if fault identification anticipation condition is met
It is likely to occur bipolar short trouble；Then in conjunction with positive and negative electrode busbar voltage and electric current the accurate decision-making system of amplitude whether
Bipolar short trouble really occurs.The present invention can not only be completed rapidly and accurately fault identification in 0.1ms, meet fast
Speed requirement, and can avoid causing erroneous judgement, it disclosure satisfy that to the fast of the bipolar short trouble of dc circuit breaker DC line
Speed, the requirement accurately detected.
Brief description of the drawings
Fig. 1 is the flow chart of the bipolar short trouble discrimination method of the present invention；
Fig. 2 is the circuit structure diagram of flexible direct current power transmission system；
Characteristic and identification result when Fig. 3 is DC line valve direct current exit generation bipolar earth fault；
Fig. 4 is the characteristic and identification result when bipolar earth fault occurring at the flat ripple reactance of DC line.
Embodiment
Below in conjunction with the accompanying drawings and the embodiment of the present invention is described in detail specific embodiment.
As shown in figure 1, the discrimination method of the bipolar short trouble of DC line comprises the following steps：
Step 1, positive and negative electrode busbar voltage, electric current, voltage change ratio and current changing rate are obtained.
Become specifically, obtaining positive and negative electrode DC bus-bar voltage, electric current, voltage change ratio and electric current using optical transformer
The Identification Datas such as rate, in order to ensure the rapidity of data transfer, in the present embodiment, the optical transformer upload data cycle is
20us。
Step 2, judge whether positive and negative electrode busbar voltage rate of change and current changing rate meet the fault identification anticipation of setting
Condition.
Wherein, fault identification anticipation condition is：
Maximum in the absolute value of both positive and negative electrode busbar voltage transformation rates is more than voltage change ratio threshold value, Huo Zhezheng,
Maximum in the absolute value of both negative electrode bus current changing rates is more than current changing rate threshold value.
The mathematic(al) representation of above-mentioned fault identification anticipation condition can represent as follows：
Wherein, UdcP、UdcNRespectively direct-flow positive pole voltage, cathode voltage, Urate_setFor DC voltage change rate threshold value,
IdcP、IdcNRespectively direct-flow positive pole electric current, cathodal current, Irate_setFor DC current rate of change threshold value.
Step 3, if meeting, fault identification prejudges condition, judges whether positive and negative electrode busbar voltage and electric current meet setting
Fault identification criterion.
Wherein, fault identification criterion is：
(1) maximum in the absolute value of both positive and negative electrode busbar voltages is not more than direct current voltage-to-ground minimum threshold；
(2) maximum in the absolute value of both positive and negative electrode bus currents is not less than DC current max-thresholds or positive and negative
The minimum value of the absolute value of both pole bus currents is not more than DC current minimum threshold.
Above-mentioned fault identification criterion (1), the mathematic(al) representation of (2) can represent as follows：
Wherein, UdcP、UdcNRespectively direct-flow positive pole voltage, cathode voltage, IdcP、IdcNRespectively direct-flow positive pole electric current, negative
Electrode current, Udcgmin_setFor direct current voltage-to-ground minimum threshold；Idcgmax_setFor DC current max-thresholds, Idcgmin_setTo be straight
Flow electric current minimum threshold.
If above-mentioned fault identification criterion (1), (2) are satisfied by, then it is assumed that meet fault identification criterion.
Step 4, if meeting fault identification criterion, bipolar short trouble occurs for decision-making system.
It should be noted that above-mentioned Udcgmin_set、Idcgmax_set、Idcgmin_set、Urate_setAnd Irate_setIt is configuration
Parameter, according to DC line different faults point, the trouble point fault characteristic parameter is obtained by system simulation method, and combine each
The characteristic of individual trouble point selects suitable configuration parameter, and this kind of method has more universality and flexibility.
Under conditions of meeting that dc circuit breaker judges requirement of the time less than 0.1ms to DC line fault detection, it is
The reliability of fault identification is further improved, can be that the parameter that continuous 80us uploads to optical transformer is carried out in continuous 4 cycles
Identification, fault verification time are less than 0.1ms.
In order to verify the feasibility of the discrimination method of bipolar short trouble, as shown in Fig. 2 building both ends VSC-HVDC flexibilities
DC transmission system model, system parameter setting are as follows：DC voltage is ± 200kV, rated capacity 400MVA, DC current
Rotection thresholds are 1200A.Configuration parameter direct current voltage-to-ground minimum threshold Udcgmin_set=80kv, direct current voltage-to-ground maximum threshold
Value Udcgmax_set=280kv, DC current minimum threshold Idcgmin_set=0A, DC current max-thresholds Idcgmax_set=
1200A, DC voltage change rate threshold value Urate_set=9.04kv/us, DC current rate of change threshold value Irate_set=2A/us.
In fig. 2, when bipolar earth fault occurs in trouble point 1 (valve side direct current exit), the electricity of positive and negative bus
Pressure, curent change situation are as shown in Figure 3.Positive and negative busbar voltage is reduced rapidly to zero or so simultaneously, because failure occurs in the change of current
At valve outlet, fault current shows as first being down to zero is quickly reversed increase again, occurs in failure in the 0.1ms times, breaker is complete
Into being rapidly completed fault identification, and perform disjunction protection.
In fig. 2, when bipolarity earth fault breaks down a little 2 (smoothing reactor line side), the electricity of positive and negative bus
Pressure, curent change situation are as shown in Figure 4.Positive and negative busbar voltage is reduced rapidly to zero or so simultaneously, because failure occurs in flat ripple
Reactor line side, the trend at failure station does not invert before and after failure, therefore fault current increases rapidly.Occur in failure
In the 0.1ms times, breaker is rapidly completed fault identification, and performs sectionalised protection.
The present invention is according to dc bus positive and negative electrode voltage, the situation of change of electric current, startup separator detection logic, and foundation
The criterion of dc bus positive and negative electrode voltage change ratio and current changing rate as fault detect, by comparing fault identification parameter
With respective threshold magnitude relationship, fault identification can be fast and accurately completed in 0.1ms, avoid causing erroneous judgement, met again fast
Speed requirement, quick, the requirement that accurately detects of the bipolar short trouble of dc circuit breaker DC line can be met.
Claims (3)
1. a kind of discrimination method of the bipolar short trouble of DC line, it is characterised in that comprise the following steps：
Obtain positive and negative electrode busbar voltage, electric current, voltage change ratio and current changing rate；
Judge whether positive and negative electrode busbar voltage rate of change and current changing rate meet the fault identification anticipation condition of setting；
If meeting, fault identification prejudges condition, judges whether positive and negative electrode busbar voltage and electric current meet that the fault identification of setting is sentenced
Other condition；
If meeting fault identification criterion, bipolar short trouble occurs for decision-making system.
2. the discrimination method of the bipolar short trouble of DC line according to claim 1, it is characterised in that the failure is distinguished
Knowing anticipation condition is：
Maximum in the absolute value of both positive and negative electrode busbar voltage transformation rates is more than DC voltage change rate threshold value, Huo Zhezheng,
Maximum in the absolute value of both negative electrode bus current changing rates is more than DC current rate of change threshold value.
3. the discrimination method of the bipolar short trouble of DC line according to claim 1 or 2, it is characterised in that the event
Barrier recognizes criterion：
(1) absolute value of both positive and negative electrode busbar voltages is no more than direct current voltage-to-ground minimum threshold；
(2) maximum in the absolute value of both positive and negative electrode bus currents is female not less than DC current max-thresholds or positive and negative electrode
The minimum value of the absolute value of both line currents is not more than DC current minimum threshold.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109613400A (en) * | 2018-12-24 | 2019-04-12 | 华中科技大学 | Soft straight electric network fault detection method is maked somebody a mere figurehead based on the current-limiting reactor voltage difference opposite sex |
| CN110265990A (en) * | 2018-03-12 | 2019-09-20 | 丁美连 | A kind of more wells coupling common DC bus voltage balance controls of pumping unit and fault detection method |
| CN110308364A (en) * | 2019-06-28 | 2019-10-08 | 国网陕西省电力公司电力科学研究院 | A kind of short circuit current quick discrimination method and judgement system based on current instantaneous value in conjunction with current changing rate |
| CN110514949A (en) * | 2019-09-09 | 2019-11-29 | 珠海格力智能装备有限公司 | Detection method and device for printed circuit board assembly, storage medium and processor |
| CN110601155A (en) * | 2019-08-28 | 2019-12-20 | 重庆大学 | Protection method of multi-terminal flexible extra-high voltage direct current transmission system |
| CN111289843A (en) * | 2020-03-30 | 2020-06-16 | 云南电网有限责任公司电力科学研究院 | MMC-MTDC system direct-current line interelectrode fault distance measurement method |
| CN112345882A (en) * | 2020-10-14 | 2021-02-09 | 云南电网有限责任公司文山供电局 | Rapid fault detection method based on fuzzy inference system |
| CN114740039A (en) * | 2022-03-22 | 2022-07-12 | 首钢智新迁安电磁材料有限公司 | Strip steel temperature identification method and system, electronic equipment and storage medium |
| CN114740039B (en) * | 2022-03-22 | 2024-10-22 | 首钢智新迁安电磁材料有限公司 | Strip steel temperature identification method, system, electronic equipment and storage medium |
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| CN110265990A (en) * | 2018-03-12 | 2019-09-20 | 丁美连 | A kind of more wells coupling common DC bus voltage balance controls of pumping unit and fault detection method |
| CN110265990B (en) * | 2018-03-12 | 2023-11-14 | 丁美连 | Multi-well coupling common direct current bus voltage balance control and fault detection method for oil pumping unit |
| CN109613400A (en) * | 2018-12-24 | 2019-04-12 | 华中科技大学 | Soft straight electric network fault detection method is maked somebody a mere figurehead based on the current-limiting reactor voltage difference opposite sex |
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| CN110308364A (en) * | 2019-06-28 | 2019-10-08 | 国网陕西省电力公司电力科学研究院 | A kind of short circuit current quick discrimination method and judgement system based on current instantaneous value in conjunction with current changing rate |
| CN110601155A (en) * | 2019-08-28 | 2019-12-20 | 重庆大学 | Protection method of multi-terminal flexible extra-high voltage direct current transmission system |
| CN110601155B (en) * | 2019-08-28 | 2021-06-08 | 重庆大学 | Protection method of multi-terminal flexible extra-high voltage direct current transmission system |
| CN110514949A (en) * | 2019-09-09 | 2019-11-29 | 珠海格力智能装备有限公司 | Detection method and device for printed circuit board assembly, storage medium and processor |
| CN111289843A (en) * | 2020-03-30 | 2020-06-16 | 云南电网有限责任公司电力科学研究院 | MMC-MTDC system direct-current line interelectrode fault distance measurement method |
| CN112345882A (en) * | 2020-10-14 | 2021-02-09 | 云南电网有限责任公司文山供电局 | Rapid fault detection method based on fuzzy inference system |
| CN112345882B (en) * | 2020-10-14 | 2022-10-11 | 云南电网有限责任公司文山供电局 | Rapid fault detection method based on fuzzy inference system |
| CN114740039A (en) * | 2022-03-22 | 2022-07-12 | 首钢智新迁安电磁材料有限公司 | Strip steel temperature identification method and system, electronic equipment and storage medium |
| CN114740039B (en) * | 2022-03-22 | 2024-10-22 | 首钢智新迁安电磁材料有限公司 | Strip steel temperature identification method, system, electronic equipment and storage medium |
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Application publication date: 20171215 |