双馈机组低电压穿越控制策略改进  

Improvement of LVRT Control Strategy of Doubly Fed Induction Generator

作　　者：朱玲[1] 文一宇[2] 付昂[2] 苏秀娥[1] 

机构地区：[1]国电南瑞科技股份有限公司,江苏南京211106 [2]国网重庆市电力公司电力科学研究院,重庆401123

出　　处：《电力电子技术》2017年第2期33-35,共3页Power Electronics

摘　　要：双馈感应电机(DFIG)是目前存量风场和新建风场的主要机型,由于发电机与电网之间存在强耦合,DFIG在电网发生低电压故障时由于电机磁链畸变导致定转子过压过流严重。为实现机组低电压穿越(LVRT),讨论了外部电压骤降时DFIG风电系统的LVRT控制策略和保护方案,重点讨论电网跌落期间快速无功支撑和电网恢复后的功率恢复控制,仿真和实验结果表明配合Crowbar而采用相应的变流器LVRT控制策略的方式,机网侧变流器同时提供无功支撑,满足当前风电并网规范中的LVRT要求。The most widely used generator type is the doubly fed induction generator（DFIG）.Because of the close co- upling of the generator and the gird, the stator flux of DFIG is distorted while the grid voltage dip happen.To achieve the low voltage ride through （LVRT）,the LVRT control strategy and protection scheme of DFIG is discussed when voltage drip especially in fast reactive power support and power recovery control strategy.Simulation and experiment show that the proposed LVRT control strategy match the LVRT requirment of wind grid connected requirements, it has been implemented to prove the idea.

关 键 词：双馈感应电机 低电压穿越 无功支撑 

分 类 号：TM46[电气工程—电器]