中国电机工程学报2017，Vol.37Issue(12)：3583-3593,11.DOI:10.13334/j.0258-8013.pcsee.160533
基于直流电压动态分配的九开关双馈风电系统低电压穿越策略研究
A Low Voltage Ride Through Strategy for Nine-switch-converter Doubly-fed Wind Generation System Based on the DC-link Voltage Dynamic Assignment
摘要
Abstract
Nine-switch converters (NSC) can provide two sets of independent three-phase outputs by using the time-shared modulation,and thus can be utilized to replace the traditional back-to-back converters in the doubly-fed induction generation (DFIG) wind power system.This paper proposed an optimal control strategy design for the NSC-based DFIG system by introducing the real-time dynamic de-link voltage assignment,with which one set of control strategies can be effective under both normal grid-voltage and grid-dip conditions.With the proposed design,high dc-link voltage of NSC in normal grid condition was automatically assigned to the grid-side to match the high grid voltage;and high dc-link voltage when the grid dips was automatically assigned to the rotor-side to match the rotor's overshoot voltage.Such an automatic assignment makes the NSC-based DFIG system can achieve low-voltage-ride-through (LVRT) without extra auxiliary crowbar circuits,and thus fully use the advantages of NSC;such an automatic assignment can also avoid the mode-switching between different control strategies and the detection of grid-dip moment,and thus can greatly reduce the system complication.关键词
双馈风力发电系统/九开关变换器/低电压穿越/动态分时策略Key words
doubly-fed wind generation system/nine-switch converter (NSC)/low voltage ride through (LVRT)/dynamic time-shared strategy分类
信息技术与安全科学引用本文复制引用
陈宇,文刚,康勇..基于直流电压动态分配的九开关双馈风电系统低电压穿越策略研究[J].中国电机工程学报,2017,37(12):3583-3593,11.基金项目
国家自然科学基金项目(51207065).Project Supported by National Natural Science Foundation of China(51207065). （51207065）
