CN105226607B - A kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods - Google Patents
A kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods Download PDFInfo
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- CN105226607B CN105226607B CN201510694915.1A CN201510694915A CN105226607B CN 105226607 B CN105226607 B CN 105226607B CN 201510694915 A CN201510694915 A CN 201510694915A CN 105226607 B CN105226607 B CN 105226607B
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Abstract
The present invention relates to a kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods, belong to extra-high voltage direct-current transmission protection systems technology field.The present invention collection valve group net side three-phase voltage and neutral bus electric current, and extract second harmonic component in neutral bus electric current first；Then judge valve group net side three-phase voltage imposes a condition with whether second harmonic component in the neutral bus electric current extracted meets；It is satisfied by if imposing a condition, harmonic protection action.In addition, harmonic protection is carried out segment processing by the reliability in order to further improve system, the present invention, different delayed time uses different action policies.Guard method proposed by the invention being capable of quickly and accurately failure judgement, it is to avoid non-faulting valve unit protection misses locking, improves the reliability of protection system.
Description
Technical field
The present invention relates to a kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods, belong to extra-high voltage direct-current
Power transmission protection systems technology field.
Background technology
Extra-high voltage direct-current 100Hz harmonic protections are important defencive functions in extra-high voltage DC transmission system, are used as exchange
The back-up protection of the system failure, prevents DC equipment from flowing through the harm that 100Hz harmonic currents are caused for a long time.It is when occurring exchange
After failure of uniting, larger 100Hz harmonic currents are contained in straight-flow system, when harmonic current is more than action definite value, by certain
Delay output protection actuating signal, send handover control system, drop electric current or phase shift locking DC transmission system.
Existing 100Hz harmonic protections method only judges the size of harmonic current value, when harmonic current is determined more than certain
During value, the output protection actuating signal after corresponding delay；But under extra-high voltage direct-current layer-specific access system, due to main electrical scheme
The change of mode, high and low end valve group accesses two different AC system nets, and it is humorous that each fault in ac transmission system can produce 100Hz
Ripple electric current, therefore original sentence, according to can not effectively recognize faulty section, any fault in ac transmission system is satisfied by original sentence evidence, electrode protector
100Hz harmonic protections action, the high and low end valve group of locking, cause non-faulting valve group stop transport, it is impossible to meet protection Basic Design
Principle.
The content of the invention
It is an object of the invention to provide a kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods, to solve
Existing harmonic protection causes non-faulting valve unit protection misoperation, causes the problem of non-applause valve group is stopped transport.
The present invention provides a kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protections to solve above-mentioned technical problem
The step of method, harmonic protection method, is as follows：
1) collection valve group net side three-phase voltage and neutral bus electric current, and extract second harmonic point in neutral bus electric current
Amount；
2) judge whether second harmonic component meets down in valve group net side three-phase voltage and the neutral bus electric current extracted
Row condition,
Uabc ＜ Δs
IDNC_100Hz ＞ Δs+K* | IDNC |
Wherein Uabc is the valve group net side three-phase voltage of collection, and IDNC_100Hz is two in the neutral bus electric current extracted
Order harmonic components, Δ is constant definite value, and K is ratio brake coefficient；
If 3) above-mentioned condition is satisfied by, harmonic protection action.
The step 3) in harmonic protection be divided into three sections, every section of delay and action policy are respectively：
First paragraph action delay is T1, and action policy is：Handover control system；
Second segment action delay is T2, and action policy is：Electric current drops；
3rd section of action delay is T3, and action policy is：Phase shift locking, while tripping AC circuit breaker.
Described action delay T1, T2 and T3 relation is as follows：T1<T2<T3.
Described action delay T1, T2 and T3 be respectively：1s、7s、10s.
The second harmonic component IDNC_100Hz a width of 80Hz~120Hz of band in the neutral bus electric current extracted.
Described 100Hz harmonic protections are realized by valve unit protection device.
The beneficial effects of the invention are as follows:The present invention collection valve group net side three-phase voltage and neutral bus electric current, and carry first
Take out second harmonic component in neutral bus electric current；Then valve group net side three-phase voltage and the neutral bus electric current extracted are judged
Whether middle second harmonic component, which meets, imposes a condition；It is satisfied by if imposing a condition, harmonic protection action.In addition, in order to enter one
The reliability of raising system is walked, harmonic protection is carried out segment processing by the present invention, and different delayed time uses different action policies.This
The proposed guard method of invention being capable of quickly and accurately failure judgement, it is to avoid non-faulting valve unit protection misses locking, improves guarantor
The reliability of protecting system.
Brief description of the drawings
Fig. 1 is conventional extra-high voltage major loop and measuring point schematic diagram；
Fig. 2 is extra-high voltage layer-specific access main loop of the present invention and measuring point schematic diagram；
Fig. 3 is the logic realization block diagram of 100HZ harmonic protections method of the present invention.
Embodiment
The embodiment to the present invention is described further below in conjunction with the accompanying drawings.
Extra-high voltage layer-specific access main loop and measuring point of the present invention are as shown in Fig. 2 high and low end valve component layers
The different AC system of access, based on the system, the present invention collection valve group net side three-phase voltage and neutral bus electric current first, and
Extract second harmonic component in neutral bus electric current；Then the neutral bus electricity for judging valve group net side three-phase voltage and extracting
Whether second harmonic component meets and imposes a condition in stream；It is satisfied by if imposing a condition, harmonic protection action.The present invention can be used
Built-in industrial control platform or PC devices realize that this two kinds of devices are the conventional devices of high-voltage dc transmission electrical domain.Protection
Device gathers the AC system net side three-phase voltage Uabc and neutral bus electric current IDNC of local terminal valve group access first, then passes through
Bandpass filter extracts the second harmonic component IDNC_100Hz in neutral bus electric current, then according to the logic diagram of protection
Progress logic judgment (as shown in Figure 3) and processing.The specific implementation process of this method is as follows：
1st, the AC system net side three-phase voltage Uabc and neutral bus electric current IDNC, Ran Houtong of collection local terminal valve group access
Cross bandpass filter and extract second harmonic component IDNC_100Hz in neutral bus electric current, it is with a width of 80Hz~120Hz.
2nd, the Protection criteria of 100Hz harmonic protections is：
IDNC_100Hz ＞ Δs+K* | IDNC | ＆Uabc ＜ Δs,
Wherein Δ is constant definite value, and K is ratio brake coefficient.
If the 3, meeting Protection criteria, harmonic protection action.
100Hz harmonic protections are divided into three sections by the present invention, and every section has identical criterion and protection definite value, but is delayed and dynamic
Make strategy different, three sections of corresponding criterions, delay and action policy are respectively：
1) IDNC_100Hz ＞ Δs+K* | IDNC | ＆Uabc ＜ Δs；Be delayed T1；Action policy：Handover control system；Δ is
Constant definite value, K is ratio brake coefficient, and T1 is first paragraph action delay；
2) IDNC_100Hz ＞ Δs+K* | IDNC | ＆Uabc ＜ Δs；Be delayed T2；Action policy：Electric current drops；T2 is second segment
Action delay；
3) IDNC_100Hz ＞ Δs+K* | IDNC | ＆Uabc ＜ Δs；Be delayed T3；Action policy：Phase shift locking, while tripping
AC circuit breaker；T3 is the 3rd section of action delay.
Action delay T1, T2 and T3 increase successively, i.e. T1<T2<T3, T1, T2 and T3 typical time period is respectively：1s、7s、
10s, increases successively.
The present invention intactly proposes the realization of 100Hz harmonic protections under extra-high voltage direct-current layer-specific access system mode first
Method and configuration strategy, include analog signal, Protection criteria, protection segmentation and the corresponding protection act plan of implementation method collection
Slightly, and 100Hz harmonic protections are realized by electrode protector and be changed in valve unit protection device.
Claims (6)
1. a kind of extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods, it is characterised in that the harmonic protection method
Step is as follows：
1) collection valve group net side three-phase voltage and neutral bus electric current, and extract second harmonic component in neutral bus electric current；
2) judge whether second harmonic component meets following bar in valve group net side three-phase voltage and the neutral bus electric current extracted
Part,
Uabc ＜ Δs
IDNC_100Hz ＞ Δs+K* | IDNC |
Wherein Uabc is the valve group net side three-phase voltage of collection, and IDNC_100Hz is secondary humorous in the neutral bus electric current extracted
Wave component, Δ is constant definite value, and K is ratio brake coefficient, and IDNC is neutral bus electric current；
If 3) above-mentioned condition is satisfied by, harmonic protection action.
2. extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods according to claim 1, it is characterised in that
The step 3) in harmonic protection be divided into three sections, every section of delay and action policy are respectively：
First paragraph action delay is T1, and action policy is：Handover control system；
Second segment action delay is T2, and action policy is：Electric current drops；
3rd section of action delay is T3, and action policy is：Phase shift locking, while tripping AC circuit breaker.
3. extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods according to claim 2, it is characterised in that
Described action delay T1, T2 and T3 relation is as follows：T1<T2<T3.
4. extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods according to claim 3, it is characterised in that
Described action delay T1, T2 and T3 be respectively：1s、7s、10s.
5. extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods according to claim 3, it is characterised in that
The second harmonic component IDNC_100Hz a width of 80Hz~120Hz of band in the neutral bus electric current extracted.
6. extra-high voltage direct-current layer-specific access system 100Hz harmonic protection methods according to claim 3, it is characterised in that
Described 100Hz harmonic protections are realized by valve unit protection device.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105552835B (en) * | 2016-03-07 | 2018-02-06 | 国家电网公司 | A kind of method of DC line 50Hz harmonic protection faulty action preventings |
| CN106532666B (en) * | 2016-12-30 | 2019-02-15 | 南京南瑞继保电气有限公司 | One kind being suitable for receiving end and is layered extra-high voltage direct-current valve group harmonic protection method |
| CN106877296B (en) * | 2017-03-10 | 2018-10-16 | 国网内蒙古东部电力有限公司通辽供电公司 | Current conversion station integration protection method based on broad sense no-load voltage ratio |
| CN109462247B (en) * | 2018-10-31 | 2021-06-22 | 南方电网科学研究院有限责任公司 | Flexible direct-current high-frequency harmonic resonance protection method |
| CN110676820B (en) * | 2019-09-19 | 2021-07-27 | 北京四方继保自动化股份有限公司 | High-frequency resonance backup protection method for flexible direct-current power transmission system |
| CN111725790B (en) * | 2020-06-04 | 2022-06-21 | 南方电网科学研究院有限责任公司 | 100Hz protection control method and device for multi-terminal direct current transmission system |
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| JPH06121455A (en) * | 1992-10-01 | 1994-04-28 | Mitsubishi Electric Corp | Protective relay |
| CN104052034A (en) * | 2014-07-04 | 2014-09-17 | 南京南瑞继保电气有限公司 | Method for preventing high-voltage and direct-current transmission 50 Hz harmonic protection maloperation |
| CN104377691A (en) * | 2014-11-13 | 2015-02-25 | 国网上海市电力公司 | Control and protection method for thyristor controlled phase shifter of supergrid |
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2015
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|---|---|---|---|---|
| JPH06121455A (en) * | 1992-10-01 | 1994-04-28 | Mitsubishi Electric Corp | Protective relay |
| CN104052034A (en) * | 2014-07-04 | 2014-09-17 | 南京南瑞继保电气有限公司 | Method for preventing high-voltage and direct-current transmission 50 Hz harmonic protection maloperation |
| CN104377691A (en) * | 2014-11-13 | 2015-02-25 | 国网上海市电力公司 | Control and protection method for thyristor controlled phase shifter of supergrid |
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