CN103645419B - The fault early warning system of wind energy turbine set power circuit and method - Google Patents
The fault early warning system of wind energy turbine set power circuit and method Download PDFInfo
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- CN103645419B CN103645419B CN201310656785.3A CN201310656785A CN103645419B CN 103645419 B CN103645419 B CN 103645419B CN 201310656785 A CN201310656785 A CN 201310656785A CN 103645419 B CN103645419 B CN 103645419B
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Abstract
The invention provides the fault early warning method of a kind of wind energy turbine set power circuit and system, wherein, method includes: the traveling wave electric amount on Real-time Collection wind energy turbine set power circuit; Judge whether to occur disturbance according to traveling wave electric amount, and record the time that disturbance occurs; Judge whether disturbance occurs on monitored power circuit; When judged result is for being, calculation perturbation distance; Relatively whether this perturbation distance is consistent with perturbation distance last time; When comparative result is consistent, calculate the interval that on monitored power circuit, nearest twice disturbance occurs; Interval and the interval preset are compared, when interval is less than described default interval, it is determined that monitored power circuit will break down, output fault pre-alarming result. By means of the invention it is possible to monitor the ruuning situation of wind energy turbine set power circuit in real time, wind energy turbine set fault pre-alarming information is provided in time, reduces wind energy turbine set fault, improve wind energy turbine set power supply reliability, it is ensured that wind energy turbine set safe operation.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, in particular to the fault early warning method of the fault early warning system of a kind of wind energy turbine set power circuit and wind energy turbine set power circuit.
Background technology
Wind energy turbine set is the important component part of a new generation's electrical network. The off-grid accident that recent large-scale wind power field fault causes, brings big absolutely hidden danger to the stable safe operation of power system.
But, the troubleshooting of current power system concentrates on quickly having after fault occurs and selects isolated fault equipment, is a kind of strategy afterwards processed.
Accordingly, it would be desirable to a kind of new technical scheme, it is possible to realizing accurately identifying distribution line failure evolution, it is achieved wind energy turbine set fault pre-alarming, thus improving the power supply reliability of wind energy turbine set, reducing the breakdown loss of wind energy turbine set.
Summary of the invention
The present invention is based on the problems referred to above, it is proposed that a kind of new technical scheme, it is possible to realize accurately identifying distribution line failure evolution, it is achieved wind energy turbine set fault pre-alarming, thus improving the power supply reliability of wind energy turbine set, reduces the breakdown loss of wind energy turbine set.
In view of this, the present invention proposes the fault early warning system of a kind of wind energy turbine set power circuit, including: collecting unit, the traveling wave electric amount on Real-time Collection wind energy turbine set power circuit; Record unit, judges whether to occur disturbance according to described traveling wave electric amount, and records the time that described disturbance occurs; Judging unit, it is judged that whether described disturbance occurs on monitored power circuit; Metrics calculation unit, when the judged result of described judging unit is for being, calculation perturbation distance; Comparing unit, compares this perturbation distance whether consistent with perturbation distance last time; Interval computing unit, when the comparative result at described comparing unit is consistent, calculates the interval that on described monitored power circuit, nearest twice disturbance occurs; Fault verification unit, compares described interval and the interval preset, when described interval is less than described default interval, it is determined that will break down on described monitored power circuit.
In technique scheme, it is preferable that also include: result output unit, for when described fault verification unit judges will break down on described monitored power circuit, exporting fault pre-alarming result.
In this technical scheme, by monitoring the traveling wave electric amount occurring intermittent ringing to occur on power circuit, monitor the ruuning situation of wind energy turbine set power circuit in real time, wind energy turbine set fault pre-alarming is provided in time, reduce wind energy turbine set fault, improve the reliability that wind energy turbine set is powered, it is ensured that the safe operation of wind energy turbine set.
In technique scheme, it is preferable that described traveling wave electric amount includes voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave.
In this technical scheme, traveling wave electric amount includes, but are not limited to voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave, it is also possible to be other traveling wave.
In technique scheme, it is preferable that the judge process of described judging unit includes: described voltage traveling wave and described current traveling wave are carried out four layers of wavelet transformation respectively, and extracts modulus maximum from transformation results respectively; Compare the polarity of four layers of wavelet modulus maxima of described voltage traveling wave and four layers of wavelet modulus maxima of described electric current, if there being the opposite polarity of the voltage traveling wave wavelet modulus maxima no less than three layers and current traveling wave wavelet modulus maxima, then judge that described disturbance occurs at monitored power circuit, otherwise, it is determined that described disturbance occurs outside monitored power circuit.
Operating power circuit, as certain point insulation reduces, under power-frequency voltage effect, repeatedly will intermittently cause the traveling wave propagated in power system. When disturbance occurs on monitored circuit, measure voltage traveling wave and current traveling wave opposite polarity that point obtains; And when disturbance occurs beyond monitored circuit, the voltage traveling wave measuring some acquisition is identical with current traveling wave polarity. It addition, the external interference such as switching manipulation, thunderbolt also will produce interference traveling wave on distribution line. But, the interference traveling wave such as switching manipulation, thunderbolt, compare the traveling wave of generation under power-frequency voltage encourages owing to circuit self reason causes, be random. Therefore, the rule of traveling wave appearance is disturbed based on line-internal, it may be achieved feeder line fault early warning.
In technique scheme, it is preferable that also include: arrange unit, for according to the setting command received, arranging described default interval.
In this technical scheme, user can arrange default interval according to individual demand or daily experience, if actual time, interval was less than default interval, then illustrates that the frequency that disturbance occurs is higher, then now can determine that and break down for monitored power circuit.
According to a further aspect in the invention, additionally provide the fault early warning method of a kind of wind energy turbine set power circuit, including: step 202, the traveling wave electric amount on Real-time Collection wind energy turbine set power circuit; Step 204, judges whether to occur disturbance according to described traveling wave electric amount, and records the time that described disturbance occurs; Step 206, it is judged that whether described disturbance occurs on monitored power circuit; Step 208, judged result be disturbance occur on described monitored power circuit time, calculation perturbation distance; Step 210, compares this perturbation distance whether consistent with perturbation distance last time; Step 212, when comparative result is consistent, calculates the interval that on described monitored power circuit, nearest twice disturbance occurs; Step 214, compares described interval and the interval preset, when described interval is less than described default interval, it is determined that will break down on described monitored power circuit.
In technique scheme, it is preferable that also include: step 216, when judging described monitored power circuit will break down, export fault pre-alarming result.
In this technical scheme, by monitoring the traveling wave electric amount occurring intermittent ringing to occur on wind energy turbine set power circuit, monitor the ruuning situation of wind energy turbine set in real time, wind energy turbine set fault pre-alarming is provided in time, reduce wind energy turbine set fault, improve the reliability that wind energy turbine set is powered, it is ensured that the safe operation of wind energy turbine set.
In technique scheme, it is preferable that described traveling wave electric amount includes voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave.
In this technical scheme, traveling wave electric amount includes, but are not limited to voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave, it is also possible to be other traveling wave.
In technique scheme, it is preferable that described step 206 specifically includes: described voltage traveling wave and described current traveling wave are carried out four layers of wavelet transformation respectively, and extracts modulus maximum from transformation results respectively; Compare the polarity of four layers of wavelet modulus maxima of described voltage traveling wave and four layers of wavelet modulus maxima of described electric current, if there being the opposite polarity of the voltage traveling wave wavelet modulus maxima no less than three layers and current traveling wave wavelet modulus maxima, then judge that described disturbance occurs at monitored power circuit, otherwise, it is determined that described disturbance occurs outside monitored power circuit.
Operating power circuit, as certain point insulation reduces, under power-frequency voltage effect, repeatedly will intermittently cause the traveling wave propagated in power system. When disturbance occurs on monitored circuit, measure voltage traveling wave and current traveling wave opposite polarity that point obtains; And when disturbance occurs beyond monitored circuit, the voltage traveling wave measuring some acquisition is identical with current traveling wave polarity. It addition, the external interference such as switching manipulation, thunderbolt also will produce interference traveling wave on distribution line. But, the interference traveling wave such as switching manipulation, thunderbolt, compare the traveling wave of generation under power-frequency voltage encourages owing to circuit self reason causes, be random. Therefore, the rule of traveling wave appearance is disturbed based on line-internal, it may be achieved feeder line fault early warning.
In technique scheme, it is preferable that also included before described step 202: according to the setting command received, described default interval is set.
In this technical scheme, user can arrange default interval according to individual demand or daily experience, if actual time, interval was less than default interval, then illustrates that the frequency that disturbance occurs is higher, then now can determine that and break down for monitored power circuit.
By above technical scheme, it is possible to monitor the ruuning situation of wind energy turbine set power circuit in real time, wind energy turbine set fault pre-alarming information is provided in time, reduces wind energy turbine set fault, improve wind energy turbine set power supply reliability, it is ensured that wind energy turbine set safe operation.
Accompanying drawing explanation
Fig. 1 illustrates the block diagram of the fault early warning system of wind energy turbine set power circuit according to an embodiment of the invention;
Fig. 2 illustrates the flow chart of the fault early warning method of wind energy turbine set power circuit according to an embodiment of the invention;
Fig. 3 illustrates the particular flow sheet of the fault early warning method of wind energy turbine set power circuit according to an embodiment of the invention.
Detailed description of the invention
In order to be more clearly understood that the above-mentioned purpose of the present invention, feature and advantage, below in conjunction with the drawings and specific embodiments, the present invention is further described in detail.It should be noted that when not conflicting, embodiments herein and the feature in embodiment can be mutually combined.
Elaborate a lot of detail in the following description so that fully understanding the present invention; but; the present invention can also adopt other to be different from other modes described here to implement, and therefore, protection scope of the present invention is by the restriction of following public specific embodiment.
Fig. 1 illustrates the block diagram of the fault early warning system of wind energy turbine set power circuit according to an embodiment of the invention.
As it is shown in figure 1, the fault early warning system 100 of wind energy turbine set power circuit according to an embodiment of the invention, including: collecting unit 102, the traveling wave electric amount on Real-time Collection wind energy turbine set power circuit; Record unit 104, judges whether to occur disturbance according to described traveling wave electric amount, and records the time that described disturbance occurs; Judging unit 106, it is judged that whether described disturbance occurs on monitored power circuit; Metrics calculation unit 108, when the judged result of described judging unit is for being, calculation perturbation distance; Comparing unit 110, compares this perturbation distance whether consistent with perturbation distance last time; Interval computing unit 112, when the comparative result at described comparing unit is consistent, calculates the interval that on described monitored power circuit, nearest twice disturbance occurs; Fault verification unit 114, compares described interval and the interval preset, when described interval is less than described default interval, it is determined that will break down on described monitored power circuit.
In technique scheme, it is preferable that also include: result output unit 116, for when described fault verification unit judges will break down on described monitored power circuit, exporting fault pre-alarming result.
In this technical scheme, by monitoring the traveling wave electric amount occurring intermittent ringing to occur on power circuit, monitor the ruuning situation of wind energy turbine set power circuit in real time, wind energy turbine set fault pre-alarming is provided in time, reduce wind energy turbine set fault, improve the reliability that wind energy turbine set is powered, it is ensured that the safe operation of wind energy turbine set.
In technique scheme, it is preferable that described traveling wave electric amount includes voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave.
In this technical scheme, traveling wave electric amount includes, but are not limited to voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave, it is also possible to be other traveling wave.
In technique scheme, it is preferable that the judge process of described judging unit includes: described voltage traveling wave and described current traveling wave are carried out four layers of wavelet transformation respectively, and extracts modulus maximum from transformation results respectively; Compare the polarity of four layers of wavelet modulus maxima of described voltage traveling wave and four layers of wavelet modulus maxima of described electric current, if there being the opposite polarity of the voltage traveling wave wavelet modulus maxima no less than three layers and current traveling wave wavelet modulus maxima, then judge that described disturbance occurs at monitored power circuit, otherwise, it is determined that described disturbance occurs outside monitored power circuit.
Operating power circuit, as certain point insulation reduces, under power-frequency voltage effect, repeatedly will intermittently cause the traveling wave propagated in power system. When disturbance occurs on monitored circuit, measure voltage traveling wave and current traveling wave opposite polarity that point obtains; And when disturbance occurs beyond monitored circuit, the voltage traveling wave measuring some acquisition is identical with current traveling wave polarity.It addition, the external interference such as switching manipulation, thunderbolt also will produce interference traveling wave on distribution line. But, the interference traveling wave such as switching manipulation, thunderbolt, compare the traveling wave of generation under power-frequency voltage encourages owing to circuit self reason causes, be random. Therefore, the rule of traveling wave appearance is disturbed based on line-internal, it may be achieved feeder line fault early warning.
In technique scheme, it is preferable that also include: arrange unit 118, for according to the setting command received, arranging described default interval.
In this technical scheme, user can arrange default interval according to individual demand or daily experience, if actual time, interval was less than default interval, then illustrates that the frequency that disturbance occurs is higher, then now can determine that and break down for monitored power circuit.
Fig. 2 illustrates the flow chart of the fault early warning method of wind energy turbine set power circuit according to an embodiment of the invention.
As in figure 2 it is shown, the fault early warning method of wind energy turbine set power circuit according to an embodiment of the invention, including: step 202, the traveling wave electric amount on Real-time Collection wind energy turbine set power circuit; Step 204, judges whether to occur disturbance according to described traveling wave electric amount, and records the time that described disturbance occurs; Step 206, it is judged that whether described disturbance occurs on monitored power circuit; Step 208, judged result be disturbance occur on described monitored power circuit time, calculation perturbation distance; Step 210, compares this perturbation distance whether consistent with perturbation distance last time; Step 212, when comparative result is consistent, calculates the interval that on described monitored power circuit, nearest twice disturbance occurs; Step 214, compares described interval and the interval preset, when described interval is less than described default interval, it is determined that will break down on described monitored power circuit.
In technique scheme, it is preferable that also include: step 216, when judging described monitored power circuit will break down, export fault pre-alarming result.
In this technical scheme, by monitoring the traveling wave electric amount occurring intermittent ringing to occur on wind energy turbine set power circuit, monitor the ruuning situation of wind energy turbine set in real time, wind energy turbine set fault pre-alarming is provided in time, reduce wind energy turbine set fault, improve the reliability that wind energy turbine set is powered, it is ensured that the safe operation of wind energy turbine set.
In technique scheme, it is preferable that described traveling wave electric amount includes voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave.
In this technical scheme, traveling wave electric amount includes, but are not limited to voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave, it is also possible to be other traveling wave.
In technique scheme, it is preferable that described step 206 specifically includes: described voltage traveling wave and described current traveling wave are carried out four layers of wavelet transformation respectively, and extracts modulus maximum from transformation results respectively; Compare the polarity of four layers of wavelet modulus maxima of described voltage traveling wave and four layers of wavelet modulus maxima of described electric current, if there being the opposite polarity of the voltage traveling wave wavelet modulus maxima no less than three layers and current traveling wave wavelet modulus maxima, then judge that described disturbance occurs at monitored power circuit, otherwise, it is determined that described disturbance occurs outside monitored power circuit.
Operating power circuit, as certain point insulation reduces, under power-frequency voltage effect, repeatedly will intermittently cause the traveling wave propagated in power system.When disturbance occurs on monitored circuit, measure voltage traveling wave and current traveling wave opposite polarity that point obtains; And when disturbance occurs beyond monitored circuit, the voltage traveling wave measuring some acquisition is identical with current traveling wave polarity. It addition, the external interference such as switching manipulation, thunderbolt also will produce interference traveling wave on distribution line. But, the interference traveling wave such as switching manipulation, thunderbolt, compare the traveling wave of generation under power-frequency voltage encourages owing to circuit self reason causes, be random. Therefore, the rule of traveling wave appearance is disturbed based on line-internal, it may be achieved feeder line fault early warning.
In technique scheme, it is preferable that also included before described step 202: according to the setting command received, described default interval is set.
In this technical scheme, user can arrange default interval according to individual demand or daily experience, if actual time, interval was less than default interval, then illustrates that the frequency that disturbance occurs is higher, then now can determine that and break down for monitored power circuit.
Wherein, the operation principle of the present invention is: when insulation weak spot occurs in operating power circuit, or running environment degenerates, under ac cycle power-frequency voltage effect, to there is flashover in power circuit insulation weak spot, produce disturbance traveling wave, and this disturbance traveling wave will be propagated in power system, at route survey point, this disturbance traveling wave can be acquired.
Due to, traveling wave will be propagated in systems, therefore, no matter be the disturbance traveling wave on monitored circuit, or the disturbance traveling wave in system beyond monitored circuit, all be likely to obtain at monitored route survey point. If but disturbance occurs on monitored circuit, then measure voltage traveling wave and current traveling wave opposite polarity that point obtains; And if disturbance occur beyond monitored circuit, then measure point obtain voltage traveling wave identical with current traveling wave polarity. Based on the polar relationship of the voltage traveling wave with current traveling wave of measuring some acquisition, disturbance generation area can be effectively recognized.
Disturbance traveling wave on circuit differs, and to establish a capital be fault omen, it is also possible to owing to killer switch operation causes, or what thunderbolt power system caused. But the traveling wave caused due to apparatus insulated reduction in running before line fault is regular, because three-phase alternating current Force system working voltage is periodic voltage, therefore fault omen traveling wave will be regular, repeatedly occur in a certain time interval; And other disturbance traveling wave are random comparatively speaking, discrete, disturbance interval is relatively long. Therefore, the rule that disturbance traveling wave occurs, can be used for distinguishing fault omen and system disturbance. The present invention introduces the seriality detection of disturbance traveling wave, identifies fault omen or system disturbance, it is achieved line fault early warning.
Fig. 3 illustrates the particular flow sheet of the fault early warning method of wind energy turbine set power circuit according to an embodiment of the invention.
As it is shown on figure 3, the idiographic flow of the fault early warning method of wind energy turbine set power circuit is as follows according to an embodiment of the invention:
Step 302, zero mode voltage traveling wave, zero mould current traveling wave and a phase voltage traveling wave, sample frequency 2Mhz on Real-time Collection circuit; And utilize the band filter of 5 10Khz, compare the output data of zero mould this frequency band of current traveling wave and default initiation value, whether the power system that real-time judge is monitored there occurs disturbance. Described default initiation value is different according to the difference of distribution circuit electric voltage grade. Distribution line to 6Kv and 10Kv, presets initiation value suggestion and is set to: 1A(reduction is to the value of power system primary side);Distribution line to 35Kv, presets initiation value suggestion and is set to: 3A(reduction is to the value of power system primary side).
Step 304, judges whether disturbance according to sampled data, when judged result is for being, enters step 306.
Step 306, the time that record disturbance occurs.
Step 308, carries out four layers of wavelet transformation respectively to each 64 zero mould current traveling waves of record, zero mode voltage traveling wave and a phase voltage traveling wave before and after disturbance, and wavelet function herein can be selected for a derived function of cubic B-spline function.
Step 310, extracts modulus maximum to the wavelet transform result of traveling wave data.
Step 312, it is judged that whether disturbance occurs on monitored power circuit. Compare four layers of wavelet modulus maxima of zero mode voltage traveling wave and the polarity of zero four layers of wavelet modulus maxima of mould current traveling wave one by one, if having the voltage traveling wave no less than three layers and current traveling wave wavelet modulus maxima opposite polarity, then judge that disturbance occurs on monitored power circuit; Otherwise, then judge that disturbance occurs outside monitored distribution line.
Step 314, if it is decided that disturbance occurs on monitored distribution line, then the time difference �� t determined based on the third layer wavelet modulus maxima of zero mode voltage traveling wave and a phase voltage traveling wave, calculation perturbation distance x, and computing formula is:Wherein, V0It is the speed of the zero initial traveling wave of mode voltage; V1Speed for the initial traveling wave of phase voltage.
Step 316, whether the distance comparing this disturbance is consistent with the distance of disturbance last time.
Step 318, if perturbation distance is consistent, calculates the interval that disturbance occurs on nearest monitored twice power circuit;
Step 320, the interval of the relatively nearest twice generation disturbance of calculated monitored power circuit and setting time interval.
Step 322, if calculated interval is less than setting time interval, then output distribution line fault early warning result. Wherein, setting time can be configured according to practical situation, it is considered to the power frequency period that system is properly functioning, and 60Hz system setting time is spaced apart 16ms, 50Hz system setting time and is spaced apart 20ms. If it is considered that properly functioning time, positive and negative two half cycles are all likely to puncture, then 60Hz system setting time is spaced apart 8ms, 50Hz system setting time and is spaced apart 10ms.
Technical scheme is described in detail above in association with accompanying drawing, pass through technical scheme, the ruuning situation of wind energy turbine set power circuit can be monitored in real time, wind energy turbine set fault pre-alarming information is provided in time, reduce wind energy turbine set fault, improve wind energy turbine set power supply reliability, it is ensured that wind energy turbine set safe operation.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations. All within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the fault early warning system of a wind energy turbine set power circuit, it is characterised in that including:
Collecting unit, the traveling wave electric amount on Real-time Collection wind energy turbine set power circuit;
Record unit, judges whether to occur disturbance according to described traveling wave electric amount, and records the time that described disturbance occurs;
Judging unit, it is judged that whether described disturbance occurs on monitored power circuit;
Metrics calculation unit, when the judged result of described judging unit is for being, calculation perturbation distance;
Comparing unit, compares this perturbation distance whether consistent with perturbation distance last time;
Interval computing unit, when the comparative result at described comparing unit is consistent, calculates the interval that on described monitored power circuit, nearest twice disturbance occurs;
Fault verification unit, compares described interval and the interval preset, when described interval is less than described default interval, it is determined that will break down on described monitored power circuit.
2. the fault early warning system of wind energy turbine set power circuit according to claim 1, it is characterised in that also include:
Result output unit, for when described fault verification unit judges will break down on described monitored power circuit, exporting fault pre-alarming result.
3. the fault early warning system of wind energy turbine set power circuit according to claim 1, it is characterised in that described traveling wave electric amount includes voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave.
4. the fault early warning system of wind energy turbine set power circuit according to claim 3, it is characterised in that the judge process of described judging unit includes:
Described voltage traveling wave and described current traveling wave are carried out four layers of wavelet transformation respectively, and from transformation results, extracts modulus maximum respectively;
Compare the polarity of four layers of wavelet modulus maxima of described voltage traveling wave and four layers of wavelet modulus maxima of described electric current, if there being the opposite polarity of the voltage traveling wave wavelet modulus maxima no less than three layers and current traveling wave wavelet modulus maxima, then judge that described disturbance occurs at monitored power circuit, otherwise, it is determined that described disturbance occurs outside monitored power circuit.
5. the fault early warning system of wind energy turbine set power circuit according to any one of claim 1 to 4, it is characterised in that also include:
Unit is set, for according to the setting command received, arranging described default interval.
6. the fault early warning method of a wind energy turbine set power circuit, it is characterised in that including:
Step 202, the traveling wave electric amount on Real-time Collection wind energy turbine set power circuit;
Step 204, judges whether to occur disturbance according to described traveling wave electric amount, and records the time that described disturbance occurs;
Step 206, it is judged that whether described disturbance occurs on monitored power circuit;
Step 208, judged result be disturbance occur on described monitored power circuit time, calculation perturbation distance;
Step 210, compares this perturbation distance whether consistent with perturbation distance last time;
Step 212, when comparative result is consistent, calculates the interval that on described monitored power circuit, nearest twice disturbance occurs;
Step 214, compares described interval and the interval preset, when described interval is less than described default interval, it is determined that will break down on described monitored power circuit.
7. the fault early warning method of wind energy turbine set power circuit according to claim 6, it is characterised in that also include:
Step 216, when judging will break down on described monitored power circuit, exports fault pre-alarming result.
8. the fault early warning method of wind energy turbine set power circuit according to claim 6, it is characterised in that described traveling wave electric amount includes voltage traveling wave, current traveling wave, modulus traveling-waves and/or phasor traveling wave.
9. the fault early warning method of wind energy turbine set power circuit according to claim 8, it is characterised in that described step 206 specifically includes:
Described voltage traveling wave and described current traveling wave are carried out four layers of wavelet transformation respectively, and from transformation results, extracts modulus maximum respectively;
Compare the polarity of four layers of wavelet modulus maxima of described voltage traveling wave and four layers of wavelet modulus maxima of described electric current, if there being the opposite polarity of the voltage traveling wave wavelet modulus maxima no less than three layers and current traveling wave wavelet modulus maxima, then judge that described disturbance occurs at monitored power circuit, otherwise, it is determined that described disturbance occurs outside monitored power circuit.
10. the fault early warning method of the wind energy turbine set power circuit according to any one of claim 6 to 9, it is characterised in that also included before described step 202:
According to the setting command received, described default interval is set.
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| CN103954887A (en) * | 2014-03-31 | 2014-07-30 | 国家电网公司 | Power line insulation monitoring method based on instant fault |
| CN104155540A (en) * | 2014-07-11 | 2014-11-19 | 国家电网公司 | Device for early warning wind power plant failure |
| CN104155539A (en) * | 2014-07-11 | 2014-11-19 | 国家电网公司 | Method for early warning wind power plant failure |
| CN104198895A (en) * | 2014-09-16 | 2014-12-10 | 湖南华大紫光科技股份有限公司 | Wind farm cable fault locating method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101533060A (en) * | 2009-04-03 | 2009-09-16 | 清华大学 | Power system fault pre-alarming method based on traveling wave electric amount measurement |
| CN101533062A (en) * | 2009-04-03 | 2009-09-16 | 清华大学 | Power cable on-line insulated monitoring method based on traveling wave electric amount measurement |
| WO2013071974A1 (en) * | 2011-11-17 | 2013-05-23 | Abb Research Ltd | Fault protection in mixed high-voltage transmission lines |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101533060A (en) * | 2009-04-03 | 2009-09-16 | 清华大学 | Power system fault pre-alarming method based on traveling wave electric amount measurement |
| CN101533062A (en) * | 2009-04-03 | 2009-09-16 | 清华大学 | Power cable on-line insulated monitoring method based on traveling wave electric amount measurement |
| WO2013071974A1 (en) * | 2011-11-17 | 2013-05-23 | Abb Research Ltd | Fault protection in mixed high-voltage transmission lines |
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