双馈异步风力发电机组电网故障穿越技术研究  

Research on Frequency Control Strategy of Double-Fed Induction Wind Generator

作　　者：董鹏程[1] 华青松 张洪伟 隋宗强 李立伟[1] DONG Pengcheng;HUA Qingsong;ZHANG Hongwei;SUI Zongqiang;LI Liwei(College of Automation and Electrical Engineering, Qingdao University, Qingdao 266071, China;Materials Department,State Grid Shandong Electric Power Company,Jinan 250001,China;State Grid Shandong Electric Power Maintenance Company,Jinan 250021,China)

机构地区：[1]青岛大学自动化与电气工程学院,山东青岛266071 [2]国网山东省电力公司物资部,山东济南250001 [3]国网山东省电力公司检修公司,山东济南250021

出　　处：《青岛大学学报（工程技术版）》2018年第1期1-5,16,共6页Journal of Qingdao University(Engineering & Technology Edition)

基　　金：863计划项目资助(2014AA052303);山东省自然科学基金项目资助(Y2008F23);山东省科技发展计划项目资助(2011GGB01123);山东省自主创新及成果转化专项(2014ZZCX05501)

摘　　要：针对风力发电机在电网故障后持续并网运行与调控能力亟待加强的问题,本文对双馈异步风力发电机组电网故障穿越技术进行研究。在建立双馈异步风力发电机(double fed induction generator,DFIG)转矩补充虚拟惯量控制的基础上,引入设定初始值的桨距角控制,建立DFIG的复合频率控制策略,实现频率穿越,在转子侧添加主动式Crowbar电路实现低电压穿越,从而提升DFIG的电网故障穿越能力,并通过DIgSILENT/PowerFactory实验平台进行仿真分析。仿真结果表明,通过补充转矩增加DFIG的虚拟惯量,设置初始桨距角增加备用有功,两者共同作用的复合频率策略在提升跌落度与稳态值两方面改善DFIG的调频能力;主动式Crowbar电路投切速度迅速,将其模块引入Protection策略后,在电网故障消除后可立即向电网输送有功,并在故障期间可向电网输送无功。该研究有利于电力系统安全稳定运行。Aiming at the problem that the wind turbine is running and regulating the power grid after the failure of the power grid.The main wind turbine is the double-fed asynchronous generator(DFIG).In order to solve the problem of DFIG easy-to-off operation and under-frequency modulation in the event of failure of power system,the DFIG torque is added to the virtual inertia control,on the basis of the introduction of the initial value of the pitch angle control,the establishing DFIG composite frequency control strategy to achieve frequency through the rotor side to add active Crowbar circuit to achieve low voltage through,thereby enhancing the DFIG power grid fault crossing ability and through DIgSILENT/PowerFactory experimental platform.The simulation results show that the composite frequency strategy can increase the initial pitch angle and the steady-state value by increasing the virtual inertia of the DFIG by adding the torque and increasing the initial pitch angle.To improve the frequency of DFIG FM;active Crowbar circuit switching speed quickly,the module into the protection strategy,the power grid failure can be immediately removed after the transmission of active power,and during the fault can be delivered to the power grid reactive power.The study is conducive to the safe and stable operation of the power system.

关 键 词：双馈异步风力发电机 频率穿越 低电压穿越 DIgSILENT/PowerFactory 

分 类 号：TM614[电气工程—电力系统及自动化] TM343