网压跌落下风机并网变换器控制技术的研究  

Research on Control Technology of the Wind Turbines Grid-connected Converter Under Grid Voltage Sag

作　　者：李小凡[1] 高昌平 

机构地区：[1]盐城工学院,电气工程学院,江苏盐城224051 [2]中电电气集团有限公司,江苏南京211153

出　　处：《电力电子技术》2012年第9期7-9,共3页Power Electronics

摘　　要：在电网电压跌落处于一定范围时,风力发电机组被要求保持与电网相连,通过注入无功电流以支撑电网电压恢复,依据并网变换器的电流承受能力,提出了带有电流限幅功能基于正负序参考坐标系的双矢量电流控制策略。采用对称分量法将由电网电压跌落所引起的并网点不平衡电压分解为正序、负序和零序3个平衡分量,并对并网点的功率、电网电压的相位角和注入的正、负序无功电流进行分析和推导。实验研究表明采用提出的控制方法,达到了对并网变换器过流保护的目的,并通过注入动态无功电流实现了对电网电压的支撑作用,保证了风力发电机组不脱网运行。When grid voltage sagging in a certain range, the wind turbines are required to keep connection with grid and support grid voltage by injecting reactive current.Basis of current limit of grid-connected converter,this paper proposes a new control strategy that is dual vector current control strategy with current limitator based on positive and negative synchronous rotating frame.Unbalanced voltage of point of interconnection caused by grid voltage sagging can be decomposed into positive sequence, negative and zero sequence components by method of symmetrical component. Power of interconnection point, voltage phase angle, positive and negative sequence reactive current of injection are analyzed and deduced.The experimental results show that the control strategy can achieve the purpose of over currency protection of grid-eonnected converter, support grid voltage by injecting dynamic reactive current, and ensure that the wind turbines doesn＇t run off the connecting with grid.

关 键 词：风电机组 变换器 电网电压跌落 双矢量 

分 类 号：TM315[电气工程—电机]