NSC改善DFIG电能质量与故障穿越研究  

The NSC for Improving Fault Ride-through and Power Quality of DFIG

作　　者：任永峰 云平平 薛宇 胡志帅 廉茂航 REN Yongfeng;YUN Pingping;XUE Yu;HU Zhishuai;LIAN Maohang(School of Energy and Power Engineering,Inner Mongolia University of Technology,Hohhot 010051,Inner Mongolia Autonomous Region,China;Beijing Tianrun New Energy Investment Co.,Ltd.,Chaoyang District,Beijing 100029,China;State Grid East Inner Mongolia Electric Power Research Institute,Hohhot 010020,Inner Mongolia Autonomous Region,China)

机构地区：[1]内蒙古工业大学能源与动力工程学院,内蒙古自治区呼和浩特市010051 [2]北京天润新能投资有限公司,北京市朝阳区100029 [3]国网蒙东电科院,内蒙古自治区呼和浩特市010020

出　　处：《中国电机工程学报》2018年第17期5052-5062,共11页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51567020,51367012);内蒙古自然科学基金项目(2015MS0532,2011BS0903)~~

摘　　要：为了改善电能质量问题对双馈式风电机组（doubly-fed induction generator,DFIG）正常运行的影响,提出一种九开关变换器（nine-switch converter,NSC）电能质量调节器解决方案。在对NSC的数学模型、控制方式、动态调制比策略进行理论分析的基础上,建立NSC与2MW DFIG风电机组并网模型。设计典型非线性电力电子负荷产生的谐波电流以及各类公共连接点电网电压短路故障工况,分别对投入NSC时DFIG风电系统的主要参数和运行特性进行深入分析。NSC可灵活向电网并联注入相应的谐波补偿电流,维持电网电流的正弦波特性,NSC也可灵活地向电网串联注入相应的畸变补偿电压,维持DFIG机端电压的稳定,实现DFIG风电系统柔性故障穿越（flexible fault ride-through,FFRT）运行。仿真与实验研究结果验证NSC对治理DFIG风电系统综合电能质量和提升FFRT能力的有效性。Aiming at improving the power quality problems on the normal operation of doubly-fed induction generator（DFIG） wind turbine, this paper proposed a novel united power quality conditioner（UPQC） solution strategy based on nine-switch converter（NSC）. The theoretical analysis of mathematical model, control method and dynamic modulation ratio algorithm, the simulation model of nine switch UPQC and 2 MW grid-connected DFIG wind power generation system were established. The harmonic current caused by typical non-linear power electronic load and grid voltage fault of point of common coupling（PCC） were designed to test the main parameters and operating characteristics of DFIG wind power generation system with nine switch UPQC. The NSC could parallel inject the harmonic compensation current flexibly to maintain the sine wave of grid current and could also serially inject the distortion compensation voltage to stabilize the DFIG terminal voltage, achieving the flexible fault ride-through（FFRT） operation of DFIG wind power system. The research results reveal the effectiveness of NSC on the improvement of comprehensive power quality and the FFRT capability of DFIG wind power generation system.

关 键 词：风力发电 九开关变换器 双馈电机 统一电能质量调节器 有源电力滤波器 动态电压恢复器 柔性故障穿越 

分 类 号：TM73[电气工程—电力系统及自动化]