CN105004959A - Wind farm sending-out line inter-phase fault determination method adaptive to stability control device - Google Patents
Wind farm sending-out line inter-phase fault determination method adaptive to stability control device Download PDFInfo
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Abstract
The present invention discloses a wind farm sending-out line inter-phase fault determination method adaptive to a stability control device, and belongs to the electric power system automation field. The wind farm sending-out line inter-phase fault determination method adaptive to the stability control device of the present invention considers the unique electrical characteristic of a double-fed wind turbine generator wind farm sending-out line on the basis of a conventional inter-phase fault trip determination method, overcomes the defect of determining an inter-phase fault into a single-phase fault mistakenly in the double-fed wind turbine generator wind farm sending-out line of the conventional inter-phase fault trip determination method, and enables the stability control device to determine the fault type of the wind farm sending-out line accurately. The method of the present invention comprises the following steps of firstly acquiring the three-phase currents and the three-phase voltages of the wind farm sending-out line, calculating the effective value change of the voltages and the currents and the power of the line, and determining whether a device is started or not by detecting the current and power abrupt change; determining whether the voltages reduce and reach the set values during the fault process; determining whether the currents rise and reach the set values; determining whether the inter-phase cosine voltages are less than the set values; determining whether two phase trip signals exist within the reclosing time; determining the inter-phase fault and adopting a corresponding control measure after the device satisfies the conditions of the determination method.
Description
Technical field
The invention belongs to power system automation technology field, the present invention relates to a kind of wind energy turbine set being adapted to stabilization control device more precisely and send line inter-phase fault determination methods.
Background technology
Stabilization control device is for ensureing that the safe and stable operation of electric system has very important meaning, and its tripping or malfunction all can to the consequences of bringing on a disaster property of electric system.Because the Independent Power Generation characteristic of this kind of intermittent energy source of wind-power electricity generation has larger difference with source net harmony compared with conventional energy resources, the transient characterisitics of transmitting system are also greatly different compared with traditional electrical network.
The positive-negative sequence equivalent impedance of wind farm side is far longer than the equivalent impedance of system side, and due to the low-pressure side neutral point of booster stations main-transformer usually earth-free, between age at failure, the zero sequence equivalent impedance of wind farm side only comprises the zero sequence impedance of transmission line of electricity and main transformer.Therefore the positive-negative sequence impedance that records of the stabilization control device of wind farm side is much larger than zero sequence impedance, belong to typical weak feedback system, the fault current that the stabilization control device of wind farm side is experienced is all almost zero-sequence component, healthy phases electric current amplitude with phase place is all close to identical with faulted phase current, the correct operation of device is greatly affected.
Traditional stabilization control device, when carrying out fault trip identification, generally supposes generator positive and negative sequence impedance approximately equal.And for double-fed fan motor unit, because crowbar resistance is compared can not ignore with excitation impedance, the input of DFIG crowbar circuit adds the positive-negative sequence impedance of Wind turbines, especially positive sequence impedance, thus the weak feedback degree of wind energy turbine set is strengthened, no matter under which kind of rotary regimes, all there is very big-difference in its positive and negative sequence impedance.The fault trip recognition principle made premised on the impedance of power supply positive and negative sequence is equal is lost foundation by this, or makes to change with the equal stabilization control device acting characteristic derived for condition of power supply positive and negative sequence impedance.
Phase-to phase fault determination methods based on this locality amount has more research, and the phase-to phase fault determination methods at present for circuit is:
1, Sudden Changing Rate starts
2, biphase current is had to raise after accident
3, two-phase voltage is had to reduce after accident
4, two-phase trip signal is had
5, the mistiming between two-phase trip signal is less than reclosure time
Device starts rear and after meeting above condition, is namely judged to line inter-phase fault simultaneously.
When double-fed unit wind energy turbine set sends circuit generation phase-to phase fault, the variation characteristic of electric current and voltage is compared not too identical with traditional electrical network, occurred the phenomenon only having a phase current to increase between age at failure, now can not meet above-mentioned phase-to phase fault determination methods 2, this will cause device to be judged by accident.Therefore, research and propose and new be applicable to double-fed unit wind energy turbine set to send the phase-to phase fault identification determination methods of circuit very necessary.
Summary of the invention
Goal of the invention of the present invention is:
Overcome the tripping operation of line inter-phase fault in traditional stabilization control device determination methods to be applied to existence when double-fed unit wind energy turbine set sends circuit and phase-to phase fault can be mistaken for the defect of single-phase fault, there is provided a kind of relate to alternate cosinusoidal voltage be applicable to the identification determination methods that double-fed unit wind energy turbine set sends line inter-phase fault, to ensure the action that stability control device is correct.
To achieve these goals, the present invention takes following technical scheme to realize:
(1) initial sinusoids input signal and three-phase voltage ua, ub, uc, three-phase current ia, ib, ic signal carry out low-pass filtering through low-pass filtering module, to eliminate the interference of secondary and the above harmonic component of secondary in initial sinusoids input signal;
(2) calculate three-phase voltage effective value Ua, Ub, Uc and subtract each other the rate of change that obtains voltage effective value with the voltage effective value before 20ms and be designated as dUa, dUb, dUc;
(3) calculate three-phase current effective value Ia, Ib, Ic and subtract each other the rate of change that obtains current effective value with the current effective value before 20ms and be designated as dIa, dIb, dIc;
(4) the alternate cosinusoidal voltage of three-phase is calculated
and circuit active-power P
t;
(5) detect whether occur that electric current or chugging amount start, if meet entry condition, then judge that wind energy turbine set is sent circuit and is disturbed, enter step (6) and judge, and record Startup time;
(6) according to the quantity of information that step (2) is preserved, two-phase whether is had to be greater than setting value Δ Us1 (usually can be set to 20% of rated voltage) during failure judgement in-dUa ,-dUb ,-dUc, as satisfied condition, continuing step (7), otherwise judging that phase-to phase fault does not occur circuit;
(7) according to the quantity of information that step (3) is preserved, setting value Δ Is1 (usually can be set to 10% of rated current) whether is greater than with the current changing rate of identical two-phase in step (6) in dIa, dIb, dIc during failure judgement, as satisfied condition, forward step (10) to, otherwise continue step (8);
(8) during failure judgement, in steps whether a wherein phase current effective value rate of change of two fault phases described in (7) is greater than setting value Δ Is1, if any then continuing step (9), otherwise judges that phase-to phase fault does not occur circuit;
(9) according to the quantity of information that step (4) is preserved, during failure judgement, in steps whether whether the alternate cosinusoidal voltage of two fault phases described in (7) is greater than setting value
(usually can be set to 50% of rated voltage), has, and continues step (10), otherwise judges that phase-to phase fault does not occur circuit;
(10) whether have two-phase above trip signal during failure judgement, and the mistiming between two-phase trip signal is less than reclosure time Tchz.Circuit generation phase-to phase fault is then judged as met; Otherwise judge that phase-to phase fault does not occur circuit.
In the present invention, step (5) current change quantity starts determination methods and is: detect current any phase current instantaneous value i in real time
twith current i before 20ms
t-20msdifference, if its absolute value is for several times greater than definite value Δ Is continuously, then starts wind energy turbine set and send line fault tripping operation and judge; Power variation starts determination methods: detect current active-power P in real time
twith active-power P before 200ms
t-200msdifference, if its absolute value is for several times greater than definite value Δ Ps continuously, then starts wind energy turbine set and send line tripping judgment means.The setting of definite value Δ Ps, Δ Is is suitably less under then should ensureing to escape the prerequisite of normal power swing and power adjustments, to ensure sensitivity.Sending circuit Δ Ps and can be set as 50MW usually for 500kV and above, sending circuit Δ PS and can establish 10MW for 220/330kV electric pressure; Δ Is is then set as the 5%-10% of rated current usually.
In the present invention, meet step (10) while meeting described step (1), step (2), step (3), step (4), step (5), step (6), step (7), or while meeting step (1), step (2), step (3), step (4), step (5), step (6), step (8), step (9), meet step (10) circuit generation phase fault can be judged.Described step (7), step (8) and step (9) voltage, current condition, only need satisfy condition for several times.
Step (6) (7) reflect the variation characteristic of electric parameters in the phase-to phase fault process of traditional electrical network center line road, generally have two-phase voltage to reduce during phase fault, and identical biphase current increases.
Step (8) (9) be ensure circuit generation phase-to phase fault age at failure between when there is the phenomenon only having a phase current to increase determination methods can be suitable for.
Step (10) reflects the variation characteristic of line inter-phase fault process breaker in middle amount, has two-phase trip signal and its mistiming is less than reclosure time during phase fault.
Beneficial effect of the present invention is as follows:
The invention solves existing double-fed unit wind energy turbine set and send the erroneous judgement problem that exists under some method of operation of wind energy turbine set of line fault tripping operation determination methods, can identification circuit phase fault fast; This determination methods strong adaptability, reliability is high, can realize protecting perfect cooperation with relating to net; The present invention saves human and material resources and financial resources greatly, improves automaticity and efficiency.
Accompanying drawing explanation
Fig. 1 is circuit phase fault tripping operation determination methods logic diagram.
Embodiment
Below in conjunction with accompanying drawing 1, the invention will be further described.Supposing a certain wind energy turbine set to send circuit, normally to send power be 100MW, and rated voltage is 110kV, and rated current is 1000A, and reclosure time Tchz is 1s.
First device carries out low-pass filtering to initial sinusoids input signal and three-phase voltage ua, ub, uc, three-phase current ia, ib, ic signal; Further calculating three-phase voltage effective value rate of change dUa, dUb, dUc, three-phase current effective value rate of change dIa, dIb, dIc, the alternate cosinusoidal voltage of three-phase
and circuit active-power P
t;
If device is not activated, then start according to current change quantity or power variation judgment means, the difference of the power before current active power and 200ms is greater than definite value △ Ps=10MW, or before any phase current instantaneous value and 20ms, difference between currents is greater than definite value Δ Is=100A, then thinks that device starts after continuous 5ms.
Whether have two-phase be greater than setting value Δ Us1=12kV, if meet, proceed line inter-phase fault and judge, otherwise judge to terminate if detecting in-dUa ,-dUb ,-dUc after starting.
The following current changing rate detecting voltage drop two-phase in dIa, dIb, dIc is greater than setting value Δ Is1=100A, if meet, proceeds line inter-phase fault below and judges, otherwise need the auxiliary judgment relating to alternate cosinusoidal voltage through row.
The auxiliary judgment relating to alternate cosinusoidal voltage is: be whether a phase current effective value rate of change of one of voltage drop two-phase is greater than setting value Δ Is1=100A in dIa, dIb, dIc, and
whether the alternate cosinusoidal voltage of middle voltage drop two-phase is greater than setting value
these two all meet, continue the judgement of circuit trip signal below, otherwise judge to terminate.
Next the above trip signal of two-phase is judged whether and mistiming between two-phase trip signal is greater than definite value Tchz=1s.If meet, be judged to circuit phase fault, otherwise judge to terminate.
In sum, the wind energy turbine set being adapted to stabilization control device of the present invention sends line inter-phase fault determination methods, the electrical specification that double-fed fan motor unit wind energy turbine set sends circuit uniqueness has been taken into account on the basis of traditional phase-to phase fault tripping operation determination methods, overcome traditional phase-to phase fault tripping operation determination methods and send in double-fed fan motor unit wind energy turbine set defect circuit existing and phase-to phase fault is mistaken for single-phase fault, stabilization control device can be made accurately to judge, and wind energy turbine set sends the fault type on circuit.Comprise the following steps: first to gather three-phase current and the voltage that wind energy turbine set sends circuit, the effective value change of calculating voltage electric current and power, by detecting electric current and the startup of chugging judgment means; In failure judgement process, voltage reduces and reaches setting definite value; Electric current raises and reaches setting definite value; Alternate cosinusoidal voltage is lower than setting value; Two-phase trip signal is had in reclosure time; Device is sentenced after meeting determination methods condition phase-to phase fault and take corresponding control measure.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention.All any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the wind energy turbine set being adapted to stabilization control device sends line inter-phase fault determination methods, it is characterized in that, comprises the following steps:
(1) initial sinusoids input signal and three-phase voltage ua, ub, uc, three-phase current ia, ib, ic signal carry out low-pass filtering through low-pass filtering module, to eliminate the interference of secondary and the above harmonic component of secondary in initial sinusoids input signal;
(2) calculate three-phase voltage effective value Ua, Ub, Uc and subtract each other the rate of change that obtains voltage effective value with the voltage effective value before 20ms and be designated as dUa, dUb, dUc;
(3) calculate three-phase current effective value Ia, Ib, Ic and subtract each other the rate of change that obtains current effective value with the current effective value before 20ms and be designated as dIa, dIb, dIc;
(4) the alternate cosinusoidal voltage of three-phase is calculated
and circuit active-power P
t;
(5) detect whether occur that electric current or chugging amount start, if meet entry condition, then judge that wind energy turbine set is sent circuit and is disturbed, enter step (6) and judge, and record Startup time;
(6) according to the quantity of information that step (2) is preserved, whether there is two-phase to be greater than setting value Δ Us1 during failure judgement in-dUa ,-dUb ,-dUc, as satisfied condition, continuing step (7), otherwise judging that phase-to phase fault does not occur circuit;
(7) according to the quantity of information that step (3) is preserved, setting value Δ Is1 whether is greater than with the current changing rate of identical two-phase in step (6) in dIa, dIb, dIc during failure judgement, as satisfied condition, forward step (10) to, otherwise continue step (8);
(8) during failure judgement, in steps whether a wherein phase current effective value rate of change of two fault phases described in (7) is greater than setting value Δ Is1, if any then continuing step (9), otherwise judges that phase-to phase fault does not occur circuit;
(9) according to the quantity of information that step (4) is preserved, during failure judgement, in steps whether whether the alternate cosinusoidal voltage of two fault phases described in (7) is greater than setting value
have, continue step (10), otherwise judge that phase-to phase fault does not occur circuit;
(10) whether have two-phase above trip signal during failure judgement, and the mistiming between two-phase trip signal being less than reclosure time Tchz, then judging circuit generation phase-to phase fault as met; Otherwise judge that phase-to phase fault does not occur circuit.
2. the wind energy turbine set being adapted to stabilization control device according to claim 1 sends line inter-phase fault determination methods, it is characterized in that, meet described step (1), step (2), step (3), step (4), step (5), step (6), step (10) is met while step (7), or meeting step (1), step (2), step (3), step (4), step (5), step (6), step (8), meet step (10) while step (9) and circuit generation phase fault can be judged.
3. the wind energy turbine set being adapted to stabilization control device according to claim 1 sends line inter-phase fault determination methods, it is characterized in that, described step (5) current change quantity starts determination methods and is: detect current any phase current instantaneous value i in real time
twith current i before 20ms
t-20msdifference, if its absolute value is for several times greater than definite value Δ Is, then starter gear continuously; Described step (5) power variation starts determination methods: detect current active-power P in real time
twith active-power P before 200ms
t-200msdifference, if its absolute value is for several times greater than definite value Δ Ps, then starter gear continuously.
4. the wind energy turbine set being adapted to stabilization control device according to claim 1 sends line inter-phase fault determination methods, it is characterized in that, described step (7), step (8) and step (9) voltage, current condition, only need satisfy condition for several times.
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| CN108493909A (en) * | 2018-04-13 | 2018-09-04 | 国网福建省电力有限公司 | The detection method of Distribution Network Failure based on Voltage Drop |
| CN111999583A (en) * | 2020-08-24 | 2020-11-27 | 南京工程学院 | Fault trip judging method of safety and stability control device suitable for alternating current power grid |
| CN112557961A (en) * | 2020-11-06 | 2021-03-26 | 国网河南省电力公司电力科学研究院 | Method for judging fault of double-fed wind power plant outgoing line |
| CN117039891A (en) * | 2023-10-08 | 2023-11-10 | 云南电力试验研究院(集团)有限公司 | Wind turbine generator Crowbar action identification method based on cosine similarity |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699842A (en) * | 2015-12-15 | 2016-06-22 | 南京南瑞集团公司 | Direct current near zone alternating current line phase-to-phase fault criterion used by stable control device |
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| CN112557961A (en) * | 2020-11-06 | 2021-03-26 | 国网河南省电力公司电力科学研究院 | Method for judging fault of double-fed wind power plant outgoing line |
| CN117039891A (en) * | 2023-10-08 | 2023-11-10 | 云南电力试验研究院(集团)有限公司 | Wind turbine generator Crowbar action identification method based on cosine similarity |
| CN117039891B (en) * | 2023-10-08 | 2024-02-20 | 云南电力试验研究院(集团)有限公司 | Wind turbine generator Crowbar action identification method based on cosine similarity |
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Inventor after: Xu Haibo Inventor after: Zhang Liquan Inventor after: Li Zhukun Inventor after: Si Qinghua Inventor after: Ren Jianfeng Inventor after: Luo Jianyu Inventor after: Jin Tao Inventor after: Li Xueming Inventor after: Xue Feng Inventor after: Su Bo Inventor after: Luo Jianbo Inventor after: Fang Yongjie Inventor after: Yan Yunsong Inventor after: Li Haifeng Inventor after: Luo Kaiming Inventor before: Xu Haibo Inventor before: Si Qinghua Inventor before: Ren Jianfeng Inventor before: Li Xueming Inventor before: Xue Feng Inventor before: Su Bo Inventor before: Luo Jianbo Inventor before: Fang Yongjie Inventor before: Yan Yunsong Inventor before: Zhang Liquan Inventor before: Li Zhukun |
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Effective date of registration: 20161026 Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Applicant after: Nanjing Nari Co., Ltd. Applicant after: NARI Technology Development Co., Ltd. Applicant after: State Grid Corporation of China Applicant after: STATE GRID JIANGSU ELECTRIC POWER COMPANY Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210003 Applicant before: Nanjing Nari Co., Ltd. Applicant before: NARI Technology Development Co., Ltd. Applicant before: State Grid Corporation of China |
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