双馈风电场新型无功电压控制策略研究
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摘要
针对风能随机变化的特性以及双馈风力发电机动态无功调节能力随有功功率的变动而存在的波动性,提出一种新型的无功电压控制策略。该策略首先基于风功率预测数据对电容器进行投切控制,进而分析双馈风机的PQ关系曲线,并配合静止无功补偿器对风电场进行实时的功率调控,实现无功电压的控制。该改进可显著提高并网点电压的合格率,减少电容器的投切次数。实时风速扰动风电场系统的仿真结果验证了上述策略的正确性和有效性。
According to the random variation characteristics of wind energy and the fluctuation of dynamic reactive power regulation of DFIG along with the variation of active power,this paper proposes a new control strategy for reactive power and voltage.In this strategy,the scheme of switching of capacitor bank is pre-performed based on the predicted wind power,then based on the analysis on the PQ curve of DFIG,by regulating the reactive power of wind farm in real time with SVC;it implements the reactive power and voltage control.Therefore,this improvement can enhance voltage quality and reduce capacitor responding times.The simulation results of a real time wind speed disturbance wind farm system show that the control strategy is effective and feasible.
According to the random variation characteristics of wind energy and the fluctuation of dynamic reactive power regulation of DFIG along with the variation of active power,this paper proposes a new control strategy for reactive power and voltage.In this strategy,the scheme of switching of capacitor bank is pre-performed based on the predicted wind power,then based on the analysis on the PQ curve of DFIG,by regulating the reactive power of wind farm in real time with SVC;it implements the reactive power and voltage control.Therefore,this improvement can enhance voltage quality and reduce capacitor responding times.The simulation results of a real time wind speed disturbance wind farm system show that the control strategy is effective and feasible.
引文
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[2]李晶,李建林,许洪华.基于配电网无功优化的变速恒频双馈风电机群控制策略[J].电网技术,2006,30(15):59-64.LI Jing,LI Jianlin,XU Honghua.A control strategy of doubly-fed variable speed wind turbines based on reactive power optimization of distribution systems[J].Power SystemTechnology,2006,30(15):59-64.
[3]TAPIA G,TAPIA A,OSTOLAZA J X.Proportional-integral regulator-based approach to wind farm reactive power management for secondary voltage control[J].IEEETransactions on Energy Conversion,2007,22(2):488-498.
[4]RABELO B C.Reactive power control design in doubly fed induction generators for wind turbines[J].IEEE Transactions on Industrial Electronics,2009,56(10):4154-4162.
[5]陈宁,朱凌志,王伟.改善接入地区电压稳定性的风电场无功控制策略[J].中国电机工程学报,2009,29(10):102-108.CHEN Ning,ZHU Lingzhi,WANG Wei.Strategy for reactive power control of wind farm for improving voltage stability in wind power integrated region[J].Proceedings of the CSEE,2009,29(10):102-108.
[6]MOURSI M E,JOOS G,ABBEY C.A secondary voltage control strategy for transmission level interconnection of wind generation[J].IEEE Trans.on Power Electronics,2008,23(3):1178-1190.
[7]孙涛,王伟胜,戴慧珠,等.风力发电引起的电压波动和闪变[J].电网技术,2003,27(12):62-67.SUN Tao,WANG Weisheng,DAI Huizhu,et al.Voltage fluctuation and flicker caused by wind power generation[J].Power System Technology,2003,27(12):62-67.
[8]郎永强,张学广,徐殿国,等.双馈电机风电场无功功率分析及控制策略[J].中国电机工程学报,2007,27(9):77-82.LANG Yongqiang,ZHANG Xueguang,XU Dianguo,et al.Reactive power analysis and control of doubly fed induction generator wind farm[J].Proceedings of the CSEE,2007,27(9):77-82.
[9]毛启静.利用风力发电机的无功功率补偿风电场无功损耗[J].电网技术,2009,33(19):175-180.MAO Qijing.Compensating reactive power loss of wind farm with reactive power generated by wind turbine generators[J].Power System Technology,2009,33(19):175-180.
[10]王松岩,朱凌志,陈宁,等.基于分层原则的风电场无功控制策略[J].电力系统自动化,2009,33(13):83-88.WANG Songyan,ZHU Lingzhi,CHEN Ning,et al.A reactive power control strategy for wind farm based hierarchical layered principle[J].Automation of Electric Power Systems,2009,33(13):83-88.