CN102510083B - Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement - Google Patents
Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement Download PDFInfo
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Abstract
The invention belongs to the technical field of the electric power system and the wind power field grid-connection, in particular to an integration protection method capable of reducing the wind power field low-voltage crossing capacity, comprising the following steps: using a current protection criterion to realize the identification of a fault line, measuring a phase voltage U Phi of a bus lineof a wind power field grid-connection transformer station for a voltage protection criterion, calculating the voltage sag amplitude value percent value V lower than low-voltage crossing stable value(90% rated voltage value); if the V value is larger than or equal to 70, the II section current protection delay is canceled by the voltage protection criterion; if the V value is smaller than 70, the current protection delay on the fault line is adjusted at the real time by the voltage protection criterion, thus the relationship between the failure cut time formed by the current protection delay time and the line breaker action intrinsic time and the V value is as follow: (V2+1707)*t=5081, wherein 0.6<=t<=4. The wind power field low-voltage crossing capacity is increased on the system level, the implementation is simple and the cost is low; simultaneously the safety operation of the wind electric machine set and the electric power system is protected.
Description
Technical field
The invention belongs to electric power system and wind farm grid-connected field, particularly a kind of integration protection method that reduces wind energy turbine set low voltage crossing capacity requirement.
Background technology
According to the requirement of electric power system industry standard, large capacity is wind farm grid-connected must possess certain low voltage ride-through capability, in emergency circumstances provides certain voltage and reactive power support in grid-connected system fault etc.Low voltage ride-through capability is mainly reflected in two key indexs: voltage falls amplitude and duration.The inducement that serious voltage falls generation in the electric power system is all caused by electric power system fault basically; Relaying protection is the technology that electric power system realizes fault detect, excision; Therefore the operating characteristics of relaying protection will directly determine the duration that voltage falls; Thereby affect electric power system to the requirement of the low voltage crossing capacity of grid connected wind power field wind-powered electricity generation unit.
The research to the raising low voltage ride-through capability of wind turbine generator system of carrying out at present mainly is to realize from the control strategy of adjusting wind-powered electricity generation unit current transformer.But the restriction of wind-engaging group of motors Converter Capacity or the power electronic device design parameter that adopts; in the degradation failure situation; the control strategy of wind-powered electricity generation unit current transformer will lose efficacy and can only use crowbar (Crowbar) protection; with rotor short-circuit, can't realize necessary low voltage ride-through capability.At present for control strategy research and the application of wind-powered electricity generation unit current transformer, be to launch for the blower fan individuality particularly, actual needs is studied and is used for every Fans, and cost is very high; And because the otherness of blower fan individuality, and in the wind energy turbine set because the skewness of reactive power weighing apparatus, it is not good to have caused adopting the mode of wind-powered electricity generation unit current transformer control strategy to improve the effect of wind energy turbine set LVRT Capability of Wind Turbine Generator capacity.
In fact, when conventional wind-powered electricity generation unit current transformer low voltage crossing control strategy lost efficacy in the degradation failure situation, if the extent of injury that the wind farm grid-connected place of energy identification busbar voltage is fallen, the corresponding relaying protection operating characteristics of self adaptation adjustment, shorten fault clearing time, then will effectively wholely reduce the voltage dip duration that wind energy turbine set wind-powered electricity generation unit is experienced, thereby reduce electric power system to the requirement of wind energy turbine set low voltage crossing capacity; Be equipped with again LVRT Capability of Wind Turbine Generator control strategy conventional, the low capacity demand this moment, with the good low voltage crossing of realizing the grid connected wind power field.
But the two-period form current protection of just configuration routine comprises I section transient current fast tripping protection, II section overcurrent protection on the present wind farm grid-connected transformer station current collection circuit.The time-delay of I section transient current fast tripping protection attonity, fault clearing time depends primarily on the intrinsic operate time of circuit breaker, and the time is between 150 milliseconds-200 milliseconds; But the protection range of I section current protection only is about 30% of total track length.Most of fault on the circuit needs the excision of II section overcurrent protection; II section current protection needs deferred action, and time-delay will cooperate with adjacent lines or transformer according to the topological structure of the field adjusts, and time-delay is generally at 1.5-3 about second; The duration that long time-delay causes voltage to fall is very long, and is also just very high to the low voltage crossing capacity requirement of grid connected wind power field wind-powered electricity generation unit.
What LVRT Capability of Wind Turbine Generator reacted mainly is the low-voltage index; if therefore can be effectively in conjunction with the low-voltage index; consider simultaneously the two-period form overcurrent protection that generally adopts at present; the demand of the isolation of the selectivity of compatible electric power system fault and wind energy turbine set LVRT Capability of Wind Turbine Generator capacity then will realize from the requirement of electric power system aspect reduction to grid connected wind power field low voltage ride-through capability of wind turbine generator system effectively.
The compatible low-voltage index of measuring from bus and for the overcurrent index at each interval, the conventional protection according to arranged spaced is difficult to realize; But one overlaps protective relaying device in present fast-developing can realizing, the current information of multi-compartment and the integrated protection platform of the whole transformer station of busbar voltage information protection provide application foundation for addressing this problem in the acquisition station.
Summary of the invention
The objective of the invention is to have proposed a kind of integration protection method that reduces wind energy turbine set low voltage crossing capacity requirement for overcoming above problem; The present invention possesses the function that system level improves the wind energy turbine set low voltage ride-through capability, and realization is simple, cost is low; The ability that possesses simultaneously protection wind-powered electricity generation unit and safe operation of power system.
A kind of integration protection method that reduces wind energy turbine set low voltage crossing capacity requirement that the present invention proposes comprises voltage protection criterion and current protection criterion two parts; Concrete steps are as follows:
1) measures wind farm grid-connected substation bus bar phase voltage U
Φ, be used for the voltage protection criterion, wherein subscript Φ represents A, B, the mutually arbitrary phase of C; Measure the three-phase current I of each interval current collection circuit of transformer station
I Φ, be used for the current protection criterion, wherein subscript i represents i interval, traditional two-period form current protection is adopted in the current protection configuration, comprises I section current quick, II section overcurrent protection;
2) utilize the realization of current protection criterion to the identification of faulty line, after failure judgement occured, if I section current quick action instantaneous tripping, fault clearing time was at 150 milliseconds-200 milliseconds; If the action of II section overcurrent protection, delay tripping excision fault, delay value is determined by the voltage protection criterion;
3) voltage protection criterion is specific as follows: utilize bus phase voltage amplitude U
ΦThe voltage that calculating is lower than low voltage crossing stationary value (90% load voltage value) falls amplitude percent value V; Wherein:
U
ΦBe bus phase voltage amplitude; U
NBe the bus load voltage value;
If the V value, is then cancelled the time-delay of II section current protection more than or equal to 70, the II segment protect on the fault current collection circuit excises fault without deferred action;
If the V value, is then adjusted in real time II section current protection less than 70 and is delayed time, so that add that by the current protection time-delay fault clearing time and V value size that the circuit breaker action intrinsic time forms keep the pass to be: (V
2+ 1707) t=5081,0.6≤t≤4 wherein, the protection action on the acceleration disturbance current collection circuit.
Characteristics of the present invention and beneficial effect:
The inventive method is based on the Wind turbine low voltage ride-through capability standard of industry standard regulation, based on traditional transformer station's integrated protection platform, comprise towards the voltage protection criterion of full transformer station with towards the current protection criterion of monospace, the current protection criterion adopts traditional protection criterion and setting method, has proposed simultaneously to possess the under-voltage protection operating characteristics of inverse time characteristic; Increase the voltage protection criterion of considering the requirement of wind energy turbine set low voltage crossing industry standard and accelerated traditional current protection criterion fast trip excision fault at each interval; thereby reduce the requirement to grid connected wind power field blower fan low voltage crossing capacity, and improve wind farm grid-connected operation characteristic.
The present invention possesses the function that system level improves the wind energy turbine set low voltage ride-through capability, and realization is simple, cost is low; The ability that possesses simultaneously protection wind-powered electricity generation unit and safe operation of power system.
Description of drawings
Fig. 1 is the voltage protection criterion characteristic of the inventive method.
Fig. 2 is for using the grid connected wind power field schematic diagram of the inventive method.
Embodiment
A kind of integration protection method that reduces wind energy turbine set low voltage crossing capacity requirement that the present invention proposes comprises voltage protection criterion and current protection criterion two parts; Concrete steps are as follows:
1) measures wind farm grid-connected substation bus bar phase voltage U
Φ, be used for the voltage protection criterion, wherein subscript Φ represents A, B, the mutually arbitrary phase of C; Measure the three-phase current I of each interval current collection circuit of transformer station
I Φ, be used for the current protection criterion, wherein subscript i represents i interval, traditional two-period form current protection is adopted in the current protection configuration, comprises I section current quick, II section overcurrent protection;
2) utilize the realization of current protection criterion to the identification of faulty line, after failure judgement occured, if I section current quick action instantaneous tripping, fault clearing time was at 150 milliseconds-200 milliseconds; If the action of II section overcurrent protection, delay tripping excision fault, delay value is determined by the voltage protection criterion;
3) voltage protection criterion is specific as follows: utilize bus phase voltage amplitude U
ΦThe voltage that calculating is lower than low voltage crossing stationary value (90% load voltage value) falls amplitude percent value V; Wherein:
U
ΦBe bus phase voltage amplitude; U
NBe the bus load voltage value;
If the V value, is then cancelled the time-delay of II section current protection more than or equal to 70, the II segment protect on the fault current collection circuit excises fault without deferred action;
If the V value, is then adjusted the time-delay of II section current protection in real time less than 70, so that add that by the current protection time-delay fault clearing time and V value size that the circuit breaker action intrinsic time forms keep relation: (V
2+ 1707) t=5081,0.6≤t≤4 wherein, as shown in Figure 1, curve maximum V=80 appears at 0.6 second and locates among the figure; Curve minimum V=0 appears between 2.98 seconds to 4 seconds; Protection action on the acceleration disturbance current collection circuit.
For grid connected wind power shown in Figure 2 field, the embodiment of the inventive method is described in detail as follows:
Wind energy turbine set wind turbine group 1 is connected to the 35kV bus of wind farm grid-connected transformer station among Fig. 2 through current collection circuit 1; A wind energy turbine set wind-powered electricity generation group of planes 2 is connected to the 35kV bus of wind farm grid-connected transformer station through current collection circuit 2; A wind energy turbine set wind-powered electricity generation group of planes 3 is connected to the 35kV bus of wind farm grid-connected transformer station through current collection circuit 3.Wind farm grid-connected transformer station is through the access electric power system of boosting of 35kV/110kV transformer station.
Utilization is installed in existing transformer station integrated protection platform realization the inventive method in the wind farm grid-connected transformer station; current protection criterion is wherein measured the three-phase current at this interval in three intervals (current collection circuit 1, current collection circuit 2, current collection circuit 3) in the transformer station any
, and dispose traditional two-period form current protection, i.e. I section-transient current fast tripping protection, II section-overcurrent protection.Use simultaneously the busbar voltage amplitude of the integrated protection platform measuring 35kV of transformer station of patent of the present invention, be used for the voltage protection criterion of integrated protection.
The current value that passes through when the action definite value of I section-transient current fast tripping protection greater than protected circuit under maximum operational mode is terminal three-phase shortcircuit occurs, time delays is 0 second; The action definite value of II section-overcurrent protection is greater than the maximum load current value of protected circuit, and time delays adopts staged to cooperate with adjacent lines, generally at 1.5-3 about second.
Be example such as circuit among Fig. 21, transformer station's integrated protection of supposing to use the inventive method after the current protection criterion of circuit 1 is adjusted according to conventional method, the I section under normal operating mode the protection circuit total length 50%, time delays is 0 second; The action delay of II section was at 3 seconds.
If A, B double earthfault occur at circuit 1 apart from circuit top total length 85% place in this moment; the wind farm grid-connected A of transformer station phase, B phase voltage drop to 35% of rated value after the fault; transformer station's integrated protection of then using patent of the present invention starts greater than setting value towards the current protection criterion of circuit 1; because the line fault distance has exceeded the protection range of I section current protection; can only be by the action of II segment protect, the 3 seconds tripping operation excision faults of delaying time.
But fault phase A phase, B phase voltage drop to 35% of rated value, then start the voltage protection criterion of using the inventive method, and the substation bus bar phase voltage is incorporated into the power networks after the measurement fault
, and calculate V:
V=55＜70; then voltage protection criterion is adjusted the time-delay of II section current protection in real time; voltage protection criterion characteristic according to the inventive method shown in Figure 1; the II section current protection time-delay of circuit 1 will be adjusted into 1 second; the protection action tripping operation of acceleration disturbance current collection circuit 1 has reduced the requirement of electric power system to wind energy turbine set low voltage crossing performance.
Claims (1)
1. an integration protection method that reduces wind energy turbine set low voltage crossing capacity requirement comprises voltage protection criterion and current protection criterion two parts; Concrete steps are as follows:
1) measures wind farm grid-connected substation bus bar phase voltage U
Φ, be used for the voltage protection criterion, wherein subscript Φ represents A, B, the mutually arbitrary phase of C; Measure the three-phase current I of each interval current collection circuit of transformer station
I Φ, be used for the current protection criterion, wherein subscript i represents i interval, traditional two-period form current protection is adopted in the current protection configuration, comprises I section current quick, II section overcurrent protection;
2) utilize the realization of current protection criterion to the identification of faulty line, after failure judgement occured, if I section current quick action instantaneous tripping, fault clearing time was at 150 milliseconds-200 milliseconds; If the action of II section overcurrent protection, delay tripping excision fault, delay value is determined by the voltage protection criterion;
3) voltage protection criterion is specific as follows: utilize bus phase voltage amplitude U
ΦThe voltage that calculating is lower than the low voltage crossing stationary value falls amplitude percent value V; Wherein:
U
ΦBe bus phase voltage amplitude; U
NBe the bus load voltage value;
If the V value, is then cancelled the time-delay of II section overcurrent protection more than or equal to 70, the II section overcurrent protection on the fault current collection circuit is excised fault without deferred action;
If the V value, is then adjusted in real time II section overcurrent protection less than 70 and is delayed time, so that add that by the time-delay of II section overcurrent protection fault clearing time and V value size that the circuit breaker action intrinsic time forms keep the pass to be: (V
2+ 1707) t=5081,0.6≤t≤4 wherein, the protection action on the acceleration disturbance current collection circuit.
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| CN102832603B (en) * | 2012-09-18 | 2016-09-07 | 国网山东省电力公司济宁供电公司 | The quick fault of interconnected transmission line partition method that a kind of compatible photovoltaic plant low voltage crossing runs |
| CN103414171B (en) * | 2013-04-16 | 2015-09-30 | 清华大学 | The protection of current collection circuit cut rapidly completely and optimization reclosing method |
| CN104316788A (en) * | 2014-10-16 | 2015-01-28 | 国家电网公司 | Method for judging tripping of outgoing line of double-feed wind turbine generator |
| CN105914717B (en) * | 2016-04-13 | 2018-04-10 | 国网江苏省电力公司经济技术研究院 | The wind power plant current protection method of feeder line coordinated with LVRT |
| CN106451543B (en) * | 2016-11-01 | 2018-11-23 | 清华大学 | A kind of flexible emulation mode of LVRT Capability of Wind Turbine Generator output characteristics |
| CN107994549B (en) * | 2017-12-20 | 2019-07-23 | 国网江西省电力有限公司电力科学研究院 | The determination method of distribution line low-voltage circuit breaker low-voltage protection delay time |
| CN108429246A (en) * | 2018-03-29 | 2018-08-21 | 内蒙古电力勘测设计院有限责任公司 | A kind of wind power plant current collection line protection method and device |
| CN108879798B (en) * | 2018-07-04 | 2021-07-02 | 广东电网有限责任公司 | Over-current control method, system, equipment and medium for preventing error based on mutation |
| CN111276931B (en) * | 2020-02-18 | 2021-01-26 | 广东电网有限责任公司电力调度控制中心 | New energy peripheral alternating current line protection fixed value checking method, system and equipment |
| CN111884256B (en) * | 2020-07-31 | 2021-09-28 | 国网经济技术研究院有限公司 | High voltage ride through method and system for new energy unit |
| CN113095741B (en) * | 2021-05-21 | 2022-02-25 | 中国电力科学研究院有限公司 | Method and device for planning grid-connected capacity of power electronic power supply |
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