不对称电网电压条件下直驱永磁风力发电机组并网逆变器的双电流闭环控制策略的研究  

Research on dual current-loop control strategy for grid-connected inverter of directly-driven wind turbine with permanent magnet synchronous generator under unbalanced network voltage conditions

作　　者：程航[1] 曹五顺[2] 周明星[3] 

机构地区：[1]兰州工业高等专科学校,甘肃兰州730050 [2]西安交通大学电气学院,陕西西安710049 [3]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《电力系统保护与控制》2012年第7期66-72,共7页Power System Protection and Control

摘　　要：在分析不对称电网电压条件下直驱永磁风力发电机组并网逆变器的数学模型和直流母线电压波动机理的基础上,提出了正负序双电流闭环控制策略,并将陷波器应用于传统锁相环控制算法中,完成风力发电机组在电网发生不对称故障下的不脱网运行。在PSCAD/EMTDC环境下建立基于IGBT背靠背变频器的1.5MW永磁直驱风力发电系统仿真模型,仿真结果表明,该系统能够实现最大风能跟踪,并且在电网不对称故障下,该控制策略成功地抑制了直流母线电压的升高,增强不对称电网故障下直驱永磁风力发电系统的不间断运行能力。According to the performance analysis of the mathematical model of the three-phase grid-connected inverter （GCI） and the fluctuation mechanism on DC voltage of directly-driven wind turbine with permanent magnet synchronous generator （D-PMSG） under unbalanced network voltage conditions, a dual current-loop control strategy （DCC） which oriented on positive and negative voltage and current respectively is proposed to inhibit the DC voltage fluctuation, meanwhile the notch filter is introduced to conventional control strategy of phase-locked loop, so as to complete the wind generator un-off-line operation on grid faults. A 1.5MW D-PMSG with back-to-back IGBT frequency converter is simulated in the PSCAD/EMTDC environment, and simulation results show that the maximum wind energy tracking is achieved in this system and the proposed DCC strategy can prohibit the rise of DC voltage successfully and enhance the ride-through capability of D-PMSG wind generation system under unbalanced network voltage conditions.

关 键 词：直驱 双电流闭环 陷波器 最大风能跟踪 不对称电网电压 

分 类 号：TM464[电气工程—电器]