双馈风电机组限功率运行下频率稳定的变系数控制策略  

Variable Coefficient Control Strategy for Frequency Stability of DFIG Under Power-limited Operation

作　　者：李颖颖 王德林[1] 范林源 苑承勋 赵迎弟 康积涛[1] LI Yingying;WANG Delin;FAN Linyuan;YUAN Chengxun;ZHAO Yingdi;KANG Jitao(School of Electrical Engineering, Southwest Jiaotong University, Chengdu 611756, Sichuan Province, China;Sichuan Hongye Electric Power Group Co., Ltd., Yisen Power Engineering Branch, Chengdu 610000, Sichuan Province, China)

机构地区：[1]西南交通大学电气工程学院,四川省成都市611756 [2]四川宏业电力集团有限公司益森电力工程分公司,四川省成都市610000

出　　处：《电网技术》2019年第8期2910-2917,共8页Power System Technology

基　　金：国家自然科学基金资助项目(51477143)~~

摘　　要：双馈风力发电机的转子转速与系统频率相互解耦,风电大规模并网将导致系统调频能力下降。这就要求风电场具备功率调节和频率调整能力,附加的虚拟惯性环节能提供短暂的频率支撑,下垂控制环节能改善系统的稳态频率偏差。提出在限功率控制下适应不同风速进行相应的减载控制,保留部分功率备用,高风速时通过桨距角控制留有备用功率,在满足调频备用的同时,尽可能减少弃风。整定了调差系数,改善了系统的下垂控制特性,在传统方法的基础上对虚拟惯性系数进行了分析,通过不同风速下的参数分析制定了适应变风速下的变系数控制方法,使风电机组更充分的参与系统一次频率调整,最后通过变风速下仿真验证了所提控制策略的有效性。The rotor speed and system frequency of DFIG are decoupled from each other. Large scale grid integration of wind power would lead to decrease of the frequency modulation capability of power system. This requires wind farms to have power and frequency regulation capability. Additional virtual inertia links can increase grid inertia. Release of part of the kinetic energy stored in the rotor provides a short-term frequency support. And droop control can improve the system’s steady-state frequency support. In this paper, it is proposed that under power-limiting control, corresponding load reduction control should be adapted to different wind speeds, and partial power reserve be reserved. The reserved power is retained with pitch angle control under high wind speed. While frequency modulation reserve is satisfied, the curtailed wind is reduced as much as possible. The adjustment coefficient is adjusted to improve the droop control characteristics of the system. Based on traditional analysis of virtual inertia coefficient, a variable coefficient control method under variable wind speed is formulated through parameter analysis at different wind speeds. The wind turbine is thus more fully involved in the primary frequency adjustment of the system. Finally, effectiveness of the proposed control strategy is verified with simulation.

关 键 词：双馈风机 限功率控制 调差系数 一次调频 变系数控制策略 频率稳定 

分 类 号：TM721[电气工程—电力系统及自动化]