双馈风电机组多机并网系统短路电流计算方法
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摘要
双馈风电机组(doubly-fed induction generator,DFIG)多机并网系统发生故障时,各DFIG采用的控制方式和短路计算模型不尽相同,会对电网短路电流分布产生影响。为此,提出一种计及DFIG控制方式判断的电网短路电流计算方法。DFIG控制方式主要取决于机端电压跌落程度,因此针对具有辐射状接线结构的DFIG多机并网系统,分析了持续励磁控制和投crowbar保护两种控制方式下DFIG故障模型对系统故障电压分布的影响,根据所得电压分布特性提出一种故障后DFIG多机控制方式判断方法。然后与传统的同步发电机供电系统对比,给出了适用于DFIG并网系统的节点电压方程以及电网短路计算程序框图。最后以6台DFIG接入电网为例,仿真验证了所提DFIG控制方式判断方法和短路电流计算方法的有效性。
When a fault occurs in the power system with multiple DFIGs(doubly-fed induction generators), the control scheme and short circuit calculation model of the DFIGs are not all the same, thus affecting short circuit current distribution in the power system. This paper proposes a short circuit calculation method for the power system, involving the determination process of the DFIG control schemes. The control scheme of a DFIG mainly depends on its terminal voltage drop. In this paper, the influence of DFIG fault models under continuous excitation control and crowbar protection control on fault voltage distribution for the power system with a radial wiring structure is analyzed. According to the obtained voltage distribution characteristics, a determination method for the post-fault control schemes of the DFIGs is proposed. Then, by contrast with the system based on conventional synchronous generators, the node voltage equations and short circuit calculation program chart for the power system with DFIGs are given. At last, a power system with 6 DFIGs is simulated to verify effectiveness of the proposed determination method for DFIG control scheme and the short circuit calculation method.
When a fault occurs in the power system with multiple DFIGs(doubly-fed induction generators), the control scheme and short circuit calculation model of the DFIGs are not all the same, thus affecting short circuit current distribution in the power system. This paper proposes a short circuit calculation method for the power system, involving the determination process of the DFIG control schemes. The control scheme of a DFIG mainly depends on its terminal voltage drop. In this paper, the influence of DFIG fault models under continuous excitation control and crowbar protection control on fault voltage distribution for the power system with a radial wiring structure is analyzed. According to the obtained voltage distribution characteristics, a determination method for the post-fault control schemes of the DFIGs is proposed. Then, by contrast with the system based on conventional synchronous generators, the node voltage equations and short circuit calculation program chart for the power system with DFIGs are given. At last, a power system with 6 DFIGs is simulated to verify effectiveness of the proposed determination method for DFIG control scheme and the short circuit calculation method.
引文
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[12]张金华,张保会,郝治国,等.故障后转子侧变流器不间断控制下的双馈风机序网等值电路[J].电网技术,2017,41(2):521-528.Zhang Jinhua,Zhang Baohui,Hao Zhiguo,et al.Equivalent sequence circuit of DFIG wind turbines with uninterrupted control of rotor side converter after faults[J].Power System Technology,2017,41(2):521-528(in Chinese).
[13]尹俊,毕天姝,薛安成,等.计及低电压穿越控制的双馈风力发电机组短路电流特性与故障分析方法研究[J].电工技术学报,2015,30(23):116-125.YinJun,BiTianshu,XueAncheng,etal.Studyonshortcircuit currentandfaultanalysismethodofdoublefedinductiongenerator withlowvoltageride-throughcontrolstrategy[J].Transactionsof China Electrotechnical Society,2015,30(23):116-125(in Chinese).
[14]肖繁,张哲,尹项根,等.含双馈风力发电机组的电力系统故障计算方法研究[J].电工技术学报,2016,31(1):14-23.XiaoFan,ZhangZhe,YinXianggen,etal.Thefaultcalculation methodofpowersystemsincludingdoubly-fedinductiongeneration[J].Transactions of China Electrotechnical Society,2016,31(1):14-23(in Chinese).
[15]尹俊,李彦彬,熊军华,等.双馈风电场群短路电流计算与故障分析方法[J].电力自动化设备,2017,37(8):113-122.Yin Jun,Li Yanbin,Xiong Junhua,et al.Short circuit calculation and faultanalysismethodofDFIGwind-farmgroups[J].ElectricPower Automation Equipment,2017,37(8):113-122(in Chinese).
[16]贺益康,胡家兵.双馈异步风力发电机并网运行中的几个热点问题[J].中国电机工程学报,2012,32(27):1-15.HeYikang,Hu Jiabing.Several hot-spot issues associated with the grid-connected operations of wind-turbine driven doubly fed induction generators[J].ProceedingsoftheCSEE,2012,32(27):1-15(in Chinese).
[17]尹项根,张哲,肖繁,等.分布式电源短路计算模型及电网故障计算方法研究[J].电力系统保护与控制,2015,43(22):1-9.Yin Xianggen,Zhang Zhe,Xiao Fan,et al.Study on short-circuit calculation model of distributed generators and fault analysis method ofpowersystemwithdistributedgenerators[J]. PowerSystem Protection and Control,2015,43(22):1-9(in Chinese).
[18]Kong Xiangping,Zhang Zhe,Yin Xianggen,et al.Study of fault currentcharacteristicsoftheDFIGconsideringdynamicresponseof the RSC[J].IEEE Transactions on Energy Conversion,2014,29(2):278-287.
[19]张金华,张保会,陈琳浩,等.基于序网等值电路的双馈风电机组接入系统短路电流计算方法[J].电力自动化设备,2018,38(1):19-25.Zhang Jinhua,Zhang Baohui,Chen Linhao,et al.Short circuit current calculationmethodofpowersystemintegratedwithDFIGbasedon equivalentsequencecircuits[J]. ElectricPowerAutomation Equipment,2018,38(1):19-25(in Chinese).
[20]熊小伏,欧阳金鑫.电网短路时双馈感应发电机转子电流的分析与计算[J].中国电机工程学报,2012,32(28):114-121.XiongXiaofu,OuyangJinxin.Analysisandcalculationofrotor currentsfordoubly-fedinductiongeneratorsundershortcircuitsin power grids[J].Proceedings of the CSEE,2012,32(28):114-121(in Chinese).
[2]童宁,林湘宁,李正天,等.对称电压跌落条件下双馈风电机群馈出电流与线路电流保护的交互影响[J].中国电机工程学报,2014,34(22):3806-3814.Tong Ning,Lin Xiangning,Li Zhengtian,et al.Study for reciprocal effectbetweenovercurrentprotectionanddoubly-fedinduction generator feeding current under the condition of symmetrical voltage sag[J].ProceedingsoftheCSEE,2014,34(22):3806-3814(in Chinese).
[3]毕天姝,李彦宾,马丽红,等.风场及其送出线保护配置与整定研究[J].电力系统保护与控制,2014,42(5):45-50.Bi Tianshu,Li Yanbin,Ma Lihong,et al.Configuration and setting ofrelayprotectionforwindfarmanditsoutgoingline[J].Power System Protection and Control,2014,42(5):45-50(in Chinese).
[4]王江海,邰能灵,宋凯,等.考虑继电保护动作的分布式电源在配电网中的准入容量研究[J].中国电机工程学报,2010,30(22):37-43.WangJianghai,TaiNengling,SongKai,etal.Penetrationlevel permission of DG in distributed network considering relay protection[J].Proceedings of the CSEE,2010,30(22):37-43(in Chinese).
[5]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.GB/T 15544.1-2013三相交流系统短路电流计算第1部分:电流计算[S].北京:中国标准出版社,2014.
[6]Mohsen R,Mostafa P.Grid-fault ride-through analysis and control of wind turbines with doubly fed induction generators[J].Electric Power Systems Research,2010(80):184-195.
[7]王晨清,宋国兵,迟永宁,等.风电系统故障特征分析[J].电力系统自动化,2015,39(21):52-58.WangChenqing, SongGuobing, ChiYongning, etal. Fault characteristicsanalysisofwindpowersystem[J].Automationof Electric Power Systems,2015,39(21):52-58(in Chinese).
[8]向大为,杨顺昌,冉立.电网对称故障时双馈感应发电机不脱网运行的励磁控制策略[J].中国电机工程学报,2006,26(3):164-170.Xiang Dawei,Yang Shunchang,Ran Li.Ride-through control strategy ofadoublyfedinductiongeneratorforsymmetricalgridfault[J].Proceedings of the CSEE,2006,26(3):164-170(in Chinese).
[9]王宏胜,章玮,胡家兵,等.电网电压不对称故障条件下DFIG风电机组控制策略[J].电力系统自动化,2010,34(4):97-102.Wang Hongsheng,Zhang Wei,Hu Jiabing,et al.A control strategy for doubly-fed induction generator wind turbines under asymmetrical gridvoltageconditionscausedbyfaults[J].AutomationofElectric Power Systems,2010,34(4):97-102(in Chinese).
[10]马文龙.Crowbar保护在双馈异步风力发电系统电网故障穿越中的应用[J].电力自动化设备,2011,31(7):127-130.MaWenlong.ApplicationofCrowbarcircuitingridfaultriding throughfordoubly-fedinductionwindpowergenerationsystem[J].Electric Power Automation Equipment,2011,31(7):127-130(in Chinese).
[11]黄涛,陆于平.投撬棒后双馈风机暂态电势的变化特性分析[J].电网技术,2014,38(10):2759-2765.HuangTao, LuYuping. AnalysisontransientEMFvariation characteristicofdoublyfedinductiongeneratoraftercrowbar protection activated[J].Power System Technology,2014,38(10):2759-2765(in Chinese).
[12]张金华,张保会,郝治国,等.故障后转子侧变流器不间断控制下的双馈风机序网等值电路[J].电网技术,2017,41(2):521-528.Zhang Jinhua,Zhang Baohui,Hao Zhiguo,et al.Equivalent sequence circuit of DFIG wind turbines with uninterrupted control of rotor side converter after faults[J].Power System Technology,2017,41(2):521-528(in Chinese).
[13]尹俊,毕天姝,薛安成,等.计及低电压穿越控制的双馈风力发电机组短路电流特性与故障分析方法研究[J].电工技术学报,2015,30(23):116-125.YinJun,BiTianshu,XueAncheng,etal.Studyonshortcircuit currentandfaultanalysismethodofdoublefedinductiongenerator withlowvoltageride-throughcontrolstrategy[J].Transactionsof China Electrotechnical Society,2015,30(23):116-125(in Chinese).
[14]肖繁,张哲,尹项根,等.含双馈风力发电机组的电力系统故障计算方法研究[J].电工技术学报,2016,31(1):14-23.XiaoFan,ZhangZhe,YinXianggen,etal.Thefaultcalculation methodofpowersystemsincludingdoubly-fedinductiongeneration[J].Transactions of China Electrotechnical Society,2016,31(1):14-23(in Chinese).
[15]尹俊,李彦彬,熊军华,等.双馈风电场群短路电流计算与故障分析方法[J].电力自动化设备,2017,37(8):113-122.Yin Jun,Li Yanbin,Xiong Junhua,et al.Short circuit calculation and faultanalysismethodofDFIGwind-farmgroups[J].ElectricPower Automation Equipment,2017,37(8):113-122(in Chinese).
[16]贺益康,胡家兵.双馈异步风力发电机并网运行中的几个热点问题[J].中国电机工程学报,2012,32(27):1-15.HeYikang,Hu Jiabing.Several hot-spot issues associated with the grid-connected operations of wind-turbine driven doubly fed induction generators[J].ProceedingsoftheCSEE,2012,32(27):1-15(in Chinese).
[17]尹项根,张哲,肖繁,等.分布式电源短路计算模型及电网故障计算方法研究[J].电力系统保护与控制,2015,43(22):1-9.Yin Xianggen,Zhang Zhe,Xiao Fan,et al.Study on short-circuit calculation model of distributed generators and fault analysis method ofpowersystemwithdistributedgenerators[J]. PowerSystem Protection and Control,2015,43(22):1-9(in Chinese).
[18]Kong Xiangping,Zhang Zhe,Yin Xianggen,et al.Study of fault currentcharacteristicsoftheDFIGconsideringdynamicresponseof the RSC[J].IEEE Transactions on Energy Conversion,2014,29(2):278-287.
[19]张金华,张保会,陈琳浩,等.基于序网等值电路的双馈风电机组接入系统短路电流计算方法[J].电力自动化设备,2018,38(1):19-25.Zhang Jinhua,Zhang Baohui,Chen Linhao,et al.Short circuit current calculationmethodofpowersystemintegratedwithDFIGbasedon equivalentsequencecircuits[J]. ElectricPowerAutomation Equipment,2018,38(1):19-25(in Chinese).
[20]熊小伏,欧阳金鑫.电网短路时双馈感应发电机转子电流的分析与计算[J].中国电机工程学报,2012,32(28):114-121.XiongXiaofu,OuyangJinxin.Analysisandcalculationofrotor currentsfordoubly-fedinductiongeneratorsundershortcircuitsin power grids[J].Proceedings of the CSEE,2012,32(28):114-121(in Chinese).