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电网对称故障下含DFIG和PMSG的混合风电场群的协同控制策略

, PP. 26-36

Keywords: 风力发电,混合风电场,电网对称故障,无功电流极限,电网导则

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Abstract:

针对含双馈异步发电机和永磁直驱同步发电机的混合风电场群的低电压穿越技术进行详细研究。在推导双馈发电机和永磁直驱发电机的无功电流极限表达式的基础上,详细分析电压跌落程度和风速变化对其无功电流极限的影响规律,并获得满足风电场低电压穿越导则要求下双馈风电场和永磁直驱风电场的可控运行区域及其电流分配原则,进而提出无互联通信条件下混合风电场群的协同控制策略,该控制策略通过在电网故障过程中使风电场群输出最大无功电流以提高电网的暂态电压水平,并减少电网故障前后风电场群输出有功功率的变化以避免机群超速运行,使得该混合风电场群在全工况下的低电压穿越性能得到显著提高。通过仿真计算验证了所提控制策略的可靠性和有效性。

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