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基于新型正序提取器的并网与独立双模式无缝切换策略

, PP. 53-60

Keywords: 分布式发电,并网逆变器,无缝切换,正序提取器

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Abstract:

针对三相逆变器,在提出的一种电网电压正序提取器的基础上,设计了并网与独立双模式的无缝切换策略。在电网正常时,根据正序提取器所得到的正序分量计算电流给定;在电网异常时,由正序提取器保持恒频恒幅的负荷电压给定。在检测到电网恢复正常时,正序提取器又能很快地跟踪电网电压相位,使得负荷电压与电网电压同步,从而避免并网冲击。并网模式下的电流和独立模式下的电压控制均采用两相静止坐标系下的比例谐振控制器实现无静差跟踪。通过实验,验证了该文所提策略的有效性。

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