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基于可变系数的双馈风机虚拟惯量与超速控制协调的风光柴微电网频率调节技术

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Keywords: 微电网频率调节,DFIG,虚拟惯量控制,转速与自动桨距角控制,可变系数

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Abstract:

为了提高风光柴微电网孤岛运行时的频率稳定性,将变速恒频双馈感应风力发电机(DFIG)和柴油机作为调频电源,通过DFIG的虚拟惯量、转速和桨距角的协调控制与柴油机的一次调频相配合,共同抑制负荷波动和风速变化引起的微电网频率变化。低于额定风速时,DFIG采用虚拟惯量控制和超速控制;高于额定风速时,采用虚拟惯量控制和自动桨距角控制。以此弥补虚拟惯量控制作用时转速恢复过程的功率跌落问题,并为微网提供持久的功率支撑。为保证此调频策略在时变风速中的有效性,通过不同风速下的参数分析制定了DFIG的虚拟惯量控制系数曲线与功频静特性系数曲线,实现了可变系数控制。并在DIgSILENTPowerFactory软件平台上搭建了包含柴油机、DFIG、光伏电池的微电网模型,验证了此策略的有效性。

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