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电网技术  2014 

采用串联网侧变换器的双馈风电系统高电压穿越控制策略

DOI: 10.13335/j.1000-3673.pst.2014.11.015, PP. 3037-3044

Keywords: 风力发电,双馈感应发电机,串联网侧变换器,高电压穿越,暂态无功支持

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Abstract:

针对采用串联网侧变换器的双馈风电系统电机定子端电压灵活可控的特点,提出了适用于该系统的对称高电压穿越控制策略。该策略通过控制串联网侧变换器,实现电网电压对称骤升时发电机定子电压保持不变,从而抑制定子磁链的暂态直流分量,使得电机转子过电压及过电流得到有效抑制,且可有效减小发电机电磁转矩及功率的波动。在变流器电流容量的约束下,故障期间通过控制转子侧变换器与并联网侧变换器吸收无功功率,可实现该系统对电网的故障暂态无功支持。仿真结果表明,所提控制策略既能保证在电网发生对称骤升故障期间双馈风电系统不脱网运行,又可使该系统为电网电压的恢复提供无功支持。

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