CN104155539A - Method for early warning wind power plant failure - Google Patents
Method for early warning wind power plant failure Download PDFInfo
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- CN104155539A CN104155539A CN201410331319.2A CN201410331319A CN104155539A CN 104155539 A CN104155539 A CN 104155539A CN 201410331319 A CN201410331319 A CN 201410331319A CN 104155539 A CN104155539 A CN 104155539A
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Abstract
The invention provides a method for early warning a wind power plant failure based on polarities of zero mold electric current travelling waves. The method comprises the following steps: collecting the zero mold electric current travelling waves of current collection circuits and all air blower circuits of a wind power plant in real time; comparing the polarities of the zero mold electric current travelling waves of all current collection circuits, selecting one current collection circuit with the distinctive travelling wave polarity; comparing the polarities of the zero mold electric current travelling waves of all air blower circuits of the selected current collection circuit, selecting one air blower circuit with distinctive polarity, and appointing the air blower circuit as a travelling wave disturbing source circuit; calculating the time intervals of three times of latest continuous travelling wave disturbance of the travelling wave disturbing source circuit, comparing the time intervals and the setting time interval, and judging whether the travelling wave disturbing source circuit goes wrong or not. Through the adoption of the technical scheme, failure early warning information inside the wind power plant can be provided in time so as to ensure safe running of the wind power plant.
Description
Technical field
The present invention relates to power technology field, in particular to a kind of wind energy turbine set fault early warning method based on zero mould current traveling wave polarity.
Background technology
Wind energy turbine set is as shown in Figure 1 the important component part of electrical network of new generation, is connected with many current collection circuits, is connected with many blower fan circuits on every current collection circuit.The off-grid accident that the frequent large-scale wind power field fault occurring of wind energy turbine set causes, has brought huge hidden danger to the stable and safe operation of electric system.
Yet the fault handling of at present electric system is mainly after fault occurs fast isolated fault equipment selectively, belongs to processing policy afterwards, is unfavorable for preventing that fault from occurring.If can accurately identify fault progression process, realize fault pre-alarming, will greatly improve the reliability of electric system, reduce breakdown loss, also will promote effectively the development of electric power system fault treatment technology.
Therefore, propose a kind of new wind energy turbine set fault early warning method and seem very necessary.
Summary of the invention
The present invention is just based on above-mentioned technical matters, propose a kind of wind energy turbine set fault early warning method based on the zero mould current traveling wave utmost point, the fault pre-alarming information of wind energy turbine set inside can be provided in time, reduced wind energy turbine set fault, reduce wind energy turbine set breakdown loss, to guarantee the safe operation of wind energy turbine set.
The wind energy turbine set fault early warning method of the present invention just wind energy turbine set based on shown in Fig. 1 proposes, and comprising:
Zero mould current traveling wave on the current collection circuit of Real-time Collection wind energy turbine set and blower fan circuit;
The measured value of arbitrary described zero mould current traveling wave and the relation between row wave disturbance threshold value;
When the measured value of described arbitrary described zero mould current traveling wave is greater than described row wave disturbance threshold value, judge described wind energy turbine set generation row wave disturbance, record the time that described row wave disturbance occurs simultaneously;
Described zero mould current traveling wave polarity while relatively there is described row wave disturbance on all described current collection circuits;
Described zero mould current traveling wave polarity on all described current collection circuits when identical, judges that described row wave disturbance occurs on bus rod or grid side;
Described zero mould current traveling wave polarity on all described current collection circuits is inwhole when identical, select the described zero mould current traveling wave polarity current collection circuit different from current collection circuit described in other, judge whether described row wave disturbance occurs on the blower fan circuit that the described current collection circuit different from current collection circuit described in other connect;
Zero mould current traveling wave polarity on the blower fan circuit that relatively the described current collection circuit different from current collection circuit described in other connects;
When the zero mould current traveling wave polarity of all described blower fan circuits is identical, the source circuit that the main line of judging the described current collection circuit different from current collection circuit described in other is described row wave disturbance;
When the zero mould current traveling wave polarity of all described blower fan circuits inwhole when identical, select the described zero mould current traveling wave polarity blower fan circuit different from blower fan circuit described in other, and judge the source circuit that the described zero mould current traveling wave polarity blower fan circuit different from blower fan circuit described in other is described row wave disturbance;
When the source of described row wave disturbance circuit is the main line of described current collection circuit or the described zero mould current traveling wave polarity blower fan circuit different from blower fan circuit described in other, the nearest time interval that described row wave disturbance occurs for three times of source circuit of calculating described row wave disturbance;
The nearest calculated value in the time interval and the relation of setting valve that described row wave disturbance occurs for three times of source circuit of more described row wave disturbance;
When described calculated value is less than described setting valve, send fault pre-alarming signal.
In technique scheme, fault is a process, and in failure process, by the row wave disturbance occurring repeatedly, therefore, the frequency of row wave disturbance can be used as the omen of fault.Operating wind energy turbine set circuit, as a certain point insulating reduces, under power-frequency voltage effect, will repeatedly intermittently cause the row ripple of propagating in wind energy turbine set.The circuit that disturbance occurs, its zero mould current traveling wave movement is contrary with All other routes polarity.In addition, the external interference such as switching manipulation, thunderbolt also will produce on wind energy turbine set circuit disturbs row ripple, and still, row ripple is disturbed in switching manipulation, thunderbolt etc., and the row ripple of comparing the generation under power-frequency voltage excitation causing due to circuit self reason is random.Therefore, the statistical law based on disturbing row ripple to occur on circuit, can realize the early warning of wind energy turbine set line fault.
When insulation thin spot appears in operating power circuit, or running environment degenerates, under the effect of ac cycle power-frequency voltage, to there is flashover in power circuit insulation thin spot, produce disturbance row ripple, this disturbance row ripple will be propagated in electric system, and at route survey point, this disturbance row ripple can be acquired.
Because row ripple will be propagated in system, disturbance row ripple on all circuits, all will be detected.When the polarity of the capable ripple of disturbing source is contrary with the polarity of traveling wave of All other routes, the polar relationship of the current traveling wave based on obtaining on all circuits, just can identify row wave disturbance source effectively.
In addition, the disturbance row ripple on circuit differs to establish a capital and hereat hinders omen, also may cause due to killer switch operation, or thunderbolt electric system causes.The row ripple causing due to apparatus insulated reduction in service before line fault is regular, because three-phase ac power system working voltage is periodic voltage, therefore fault omen row ripple is regular, can repeatedly occur in a certain time interval, and other disturbance row ripples are random comparatively speaking, discrete, the disturbance time interval is relatively long.Therefore, the rule that disturbance row ripple occurs, can be used for distinguishing fault omen and system disturbance.The continuity of having introduced disturbance row ripple in the present invention detects, and identification row wave disturbance is fault omen or system disturbance, to realize line fault early warning.
By technical scheme of the present invention, the fault pre-alarming information of wind energy turbine set inside can be provided in time, reduce wind energy turbine set fault, reduce wind energy turbine set breakdown loss, to guarantee the safe operation of wind energy turbine set.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of wind energy turbine set of the prior art.
Fig. 2 shows the process flow diagram of wind energy turbine set fault early warning method according to an embodiment of the invention.
Fig. 3 shows the process flow diagram of wind energy turbine set fault early warning method according to an embodiment of the invention.
Embodiment
In order more clearly to understand 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, in the situation that not conflicting, the application's embodiment and the feature in embodiment can combine mutually.
A lot of details have been set forth in the following description so that fully understand the present invention; but; the present invention can also adopt other to be different from other modes described here and implement, and therefore, protection scope of the present invention is not subject to the restriction of following public specific embodiment.
Fig. 2 shows the process flow diagram of wind energy turbine set fault early warning method according to an embodiment of the invention.
As shown in Figure 2, wind energy turbine set fault early warning method according to an embodiment of the invention, comprises the following steps:
Step 201, the zero mould current traveling wave on the current collection circuit of Real-time Collection wind energy turbine set and blower fan circuit.
Step 202, relatively whether the measured value of zero mould current traveling wave is greater than row wave disturbance threshold value, when judgment result is that while being, enters step 203, when the determination result is NO, returns to step 201.
Step 203, judges described wind energy turbine set generation row wave disturbance, records the time that described row wave disturbance occurs simultaneously.
Step 204, the described zero mould current traveling wave polarity while relatively there is described row wave disturbance on all described current collection circuits; Described zero mould current traveling wave polarity on all described current collection circuits when identical, judges that described row wave disturbance occurs on bus rod or grid side, returns to step 201, and whether continue monitoring has fault to occur; Described zero mould current traveling wave polarity on all described current collection circuits is inwhole when identical, enters step 205.
Step 205, selects the described zero mould current traveling wave polarity current collection circuit different from current collection circuit described in other.
Step 206, the zero mould current traveling wave polarity on the blower fan circuit that relatively the described current collection circuit different from current collection circuit described in other connects; Inwhole when identical when the zero mould current traveling wave polarity of all described blower fan circuits, enter step 207, when the zero mould current traveling wave polarity of all described blower fan circuits is identical, enter step 208.
Step 207, selects the described zero mould current traveling wave polarity blower fan circuit different from blower fan circuit described in other, and judges the source circuit that this blower fan circuit is described row wave disturbance.
Step 208, the source circuit that the main line of judging the described current collection circuit different from current collection circuit described in other is described row wave disturbance.
Step 209, the nearest time interval that described row wave disturbance occurs for three times of source circuit of calculating described row wave disturbance;
Step 210, judges whether the nearest calculated value that the time interval of described row wave disturbance occurs for three times of source circuit of described row wave disturbance is less than setting valve, when judgment result is that while being, enter step 211, when the determination result is NO, decision-making system does not break down, and returns to step 201.
Step 211, sends fault pre-alarming signal.
In technique scheme, fault is a process, and in failure process, by the row wave disturbance occurring repeatedly, therefore, the frequency of row wave disturbance can be used as the omen of fault.Operating wind energy turbine set circuit, as a certain point insulating reduces, under power-frequency voltage effect, will repeatedly intermittently cause the row ripple of propagating in wind energy turbine set.The circuit that disturbance occurs, its zero mould current traveling wave movement is contrary with All other routes polarity.In addition, the external interference such as switching manipulation, thunderbolt also will produce on wind energy turbine set circuit disturbs row ripple, and still, row ripple is disturbed in switching manipulation, thunderbolt etc., and the row ripple of comparing the generation under power-frequency voltage excitation causing due to circuit self reason is random.Therefore, the statistical law based on disturbing row ripple to occur on circuit, can realize the early warning of wind energy turbine set line fault.
When insulation thin spot appears in operating power circuit, or running environment degenerates, under the effect of ac cycle power-frequency voltage, to there is flashover in power circuit insulation thin spot, produce disturbance row ripple, this disturbance row ripple will be propagated in electric system, and at route survey point, this disturbance row ripple can be acquired.
Because row ripple will be propagated in system, disturbance row ripple on all circuits, all will be detected.When the polarity of the capable ripple of disturbing source is contrary with the polarity of traveling wave of All other routes, the polar relationship of the current traveling wave based on obtaining on all circuits, just can identify row wave disturbance source effectively.
In addition, the disturbance row ripple on circuit differs to establish a capital and hereat hinders omen, also may cause due to killer switch operation, or thunderbolt electric system causes.The row ripple causing due to apparatus insulated reduction in service before line fault is regular, because three-phase ac power system working voltage is periodic voltage, therefore fault omen row ripple is regular, can repeatedly occur in a certain time interval, and other disturbance row ripples are random comparatively speaking, discrete, the disturbance time interval is relatively long.Therefore, the rule that disturbance row ripple occurs, can be used for distinguishing fault omen and system disturbance.The continuity of having introduced disturbance row ripple in the present invention detects, and identification row wave disturbance is fault omen or system disturbance, to realize line fault early warning.
Fig. 3 shows the process flow diagram of wind energy turbine set fault early warning method according to an embodiment of the invention.
As shown in Figure 3, wind energy turbine set fault early warning method according to an embodiment of the invention, comprises the following steps:
Step 301, zero mould current traveling wave and a phase voltage row ripple on Real-time Collection circuit, sample frequency is 3Mhz.
Step 302, whether relatively more zero mould current traveling wave and default startup value, there is row wave disturbance in the wind energy turbine set that judgement is monitored in real time, the distribution line to 6Kv and 10Kv, default startup value suggestion is made as: 1A (reduction is to the value of electric system primary side); Distribution line to 35Kv, default startup value suggestion is made as: 3A (reduction is to the value of electric system primary side).If disturbance do not detected, return to step 301, if disturbance detected, record disturbance time of origin.
, there is disturbance if monitor in wind energy turbine set in step 303, each 64 zero mould current traveling waves of record before and after all current collection circuit disturbances are carried out respectively to four layers of wavelet transformation, and wavelet function herein can be selected a derived function of cubic B-spline function; The wavelet transformation result of row wave datum is extracted to modulus maximum.
Step 304, four layers of wavelet modulus maxima polarity of more all current collection line zero mould current traveling waves, select the current traveling wave wavelet modulus maxima polarity current collection circuit contrary with other current collection line polarities that is no less than three layers; Otherwise, judge that disturbance occurs in the grid side of wind energy turbine set.
Step 305, if selected the current collection circuit that row wave disturbance occurs, the zero mould current traveling wave of all blower fan circuits that this current collection circuit joined carries out four layers of wavelet transformation.
Step 306, four layers of wavelet modulus maxima polarity of more all blower fan line zero mould current traveling waves, select the current traveling wave wavelet modulus maxima polarity current collection circuit contrary with other blower fan line polarities that is no less than three layers, and judge that disturbance occurs on this blower fan circuit; Otherwise, judge that disturbance occurs in current collection line mains.
Step 307, if decision line wave disturbance occurs in blower fan circuit or current collection line mains, calculates the time interval that nearest three row wave disturbance occur.
Step 308, the row wave disturbance time interval relatively calculating and setting time interval.
Step 309, if computing time, interval was less than setting time interval, sends wind energy turbine set fault pre-alarming signal.Consider that wind energy turbine set running environment is severe, row wave disturbance setting time is spaced apart 10 cycles, i.e. 50hz system, 200ms; 60hz system, 167ms.
More than be described with reference to the accompanying drawings technical scheme of the present invention, by technique scheme, can provide in time the fault pre-alarming information of wind energy turbine set inside, reduced wind energy turbine set fault, reduced wind energy turbine set breakdown loss, to guarantee the safe operation of wind energy turbine set.
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.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. the wind energy turbine set fault early warning method based on zero mould current traveling wave polarity, is characterized in that, comprising:
Zero mould current traveling wave on the current collection circuit of Real-time Collection wind energy turbine set and blower fan circuit;
The measured value of arbitrary described zero mould current traveling wave and the relation between row wave disturbance threshold value;
When the measured value of described arbitrary described zero mould current traveling wave is greater than described row wave disturbance threshold value, judge described wind energy turbine set generation row wave disturbance, record the time that described row wave disturbance occurs simultaneously;
Described zero mould current traveling wave polarity while relatively there is described row wave disturbance on all described current collection circuits;
Described zero mould current traveling wave polarity on all described current collection circuits when identical, judges that described row wave disturbance occurs on bus rod or grid side;
Described zero mould current traveling wave polarity on all described current collection circuits is inwhole when identical, select the described zero mould current traveling wave polarity current collection circuit different from current collection circuit described in other, judge whether described row wave disturbance occurs on the blower fan circuit that the described current collection circuit different from current collection circuit described in other connect;
Zero mould current traveling wave polarity on the blower fan circuit that relatively the described current collection circuit different from current collection circuit described in other connects;
When the zero mould current traveling wave polarity of all described blower fan circuits is identical, the source circuit that the main line of judging the described current collection circuit different from current collection circuit described in other is described row wave disturbance;
When the zero mould current traveling wave polarity of all described blower fan circuits inwhole when identical, select the described zero mould current traveling wave polarity blower fan circuit different from blower fan circuit described in other, and judge the source circuit that the described zero mould current traveling wave polarity blower fan circuit different from blower fan circuit described in other is described row wave disturbance;
When the source of described row wave disturbance circuit is the main line of described current collection circuit or the described zero mould current traveling wave polarity blower fan circuit different from blower fan circuit described in other, the nearest time interval that described row wave disturbance occurs for three times of source circuit of calculating described row wave disturbance;
The nearest calculated value in the time interval and the relation of setting valve that described row wave disturbance occurs for three times of source circuit of more described row wave disturbance;
When described calculated value is less than described setting valve, send fault pre-alarming signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410331319.2A CN104155539A (en) | 2014-07-11 | 2014-07-11 | Method for early warning wind power plant failure |
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| CN201410331319.2A CN104155539A (en) | 2014-07-11 | 2014-07-11 | Method for early warning wind power plant failure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114646899A (en) * | 2022-03-02 | 2022-06-21 | 北京合信锐风新能源发展有限公司 | Method and device for detecting faults of current collecting line of wind power plant |
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2014
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Application publication date: 20141119 |