SVC和模糊变桨距控制联合改善低电压穿越能力  

Study on Improving the Low Voltage Ride Through Capability of the Wind Farm by SVC and Fuzzy Pitch Control

作　　者：袁帅 边相阳 孟令剑 武家蔚 YUAN Shuai;BIAN Xiangyang;MENG Lingjian;WU Jiawei(Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]东北电力大学

出　　处：《吉林电力》2019年第4期28-32,共5页Jilin Electric Power

摘　　要：针对风电并网的低电压穿越(LVRT)问题,提出采用静止无功补偿器(SVC)和模糊变桨距联合控制的方法进行改善。在电网电压骤降时,通过加入模糊控制的变桨距控制策略提高系统低电压穿越能力,同时利用SVC进行无功补偿,即使风力发电系统出现故障,并入电网的网点处电压也不会大幅度下降,电网可以保持暂态稳定,发电系统低电压穿越能力得到提升。最后在Matlab/Simulink中建立发电系统和静止无功补偿器并网仿真模型。结果表明:二者联合控制在电网电压骤降时,能够将电压维持在要求的范围内,有效地提升了系统稳定性,保证机组能在规定时间内不脱网运行。Aiming at the problem of low voltage ride through(LVRT)of wind power grid connection,this paper proposes to improve it by using SVC and fuzzy pitch control.In the case of voltage sag of the power grid,LVRT capability of the system is improved by adding the variable pitch control strategy of fuzzy control.At the same time,SVC is used for reactive power compensation,so that even if the wind power generation system fails,the voltage at the network points integrated into the power grid will not drop significantly,the power grid can maintain transient stability,and the low-voltage crossing ability of the power generation system can be improved.Finally,a grid-connected simulation model of power generation system and static reactive power compensator is established in Matlab/Simulink.The experimental results show that the combined control can maintain the voltage within the required range when the grid voltage sag,effectively improve the system stability,and ensure the unit can not run off the grid operation within the specified time.

关 键 词：异步风力发电机 静止无功补偿器(SVC) 低电压穿越能力 模糊变桨距控制 故障限流 

分 类 号：TM614[电气工程—电力系统及自动化] TM711