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电网技术  2009 

基于背靠背三电平电压变换器的直驱式风力发电系统

, PP. 148-155

Keywords: 间接转矩向量控制,三电平,解耦控制,软件锁相环

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Abstract:

直驱式风力发电系统由2个背靠背二极管中点钳位型三电平电压变换器构成,机侧变换器采用间接转矩向量控制,通过调节永磁同步发电机的转速,实现风能最大跟踪;网侧变换器采用电网电压定向的向量控制,实现d、q轴电流解耦控制,使d轴电流控制有功功率,q轴电流控制无功功率。针对直驱式风力发电系统中能量流向以及二极管中点钳位型三电平的特点,提出了一种只需检测上、下电容电压,首发向量全部为负短向量,利用冗余电压向量控制中点电压平衡的方法。为提高该系统抗电网电压波动能力,采用软件锁相环,实现电网电压的同步。仿真结果表明,该控制策略实现了最大风能跟踪和功率因数为1的逆变。

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