摘要 风电机组的无功控制可极大提高风电场的灵活性,准确求取无功控制安全运行域不仅可以为各种控制策略的实现提供可靠边界,还可以减少无功补偿装置投资。文中以目前的主流机型——双馈感应发电机(DFIG)为研究对象,建立了其dq旋转坐标系下的数学模型。在此基础上,结合矢量控制的定向方式,对定子无功极限,考虑转子侧变流器(RSC)容量、RSC运行电流以及DFIG容量3个限制因素;对网侧变流器(GSC)与电网交换的无功,考虑GSC容量和最大运行电流2个限制因素,推导了计及网侧滤波电感无功损耗的无功极限解析式。最后,时域仿真验证了解析式的正确性,基于算例参数的仿真结果表明,计及网侧滤波电感损耗最大能避免总无功出力8%的误差,DFIG无功极限计算需要综合考虑多重限制因素。 The reactive power control of wind turbines can greatly improve the flexibility of wind farms.Obtaining the safe operation domain of reactive power control accurately can not only provide a reliable boundary for the realization of various control strategies,but also reduce the investment in reactive power compensation devices.This paper takes the current mainstream model,i.e.,doubly-fed induction generator(DFIG)as the research object and establishes its mathematical model in the dq rotating coordinate system.On this basis,combined with the directional method of vector control,three restriction factors of the rotor-side converter(RSC)capacity,RSC operation current and DFIG capacity are considered for the stator reactive power limit,and two restriction factors of the grid-side converter(GSC)capacity and the maximum operation current are considered for the reactive power exchanged between GSC and grid.Also,an analytic formula of the reactive power limit considering the reactive power loss of the grid-side filter inductor is derived.Finally,the time-domain simulation verifies the correctness of the analytical formula.The simulation results based on the example parameters show that the maximum 8%error of the total reactive power can be avoided by taking into account the reactive power loss of the grid-side filter inductor and the DFIG reactive power limit calculation requires comprehensive consideration of multiple restriction factors.
出处 《电力系统自动化》 EI CSCD 北大核心 2021年第7期71-78,共8页 Automation of Electric Power Systems
关键词 双馈感应发电机(DFIG) 多重限制因素 无功极限 网侧滤波电路 时域仿真 doubly-fed induction generator(DFIG) multiple restriction factors reactive power limit grid-side filter circuit time-domain simulation
