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三相并网逆变器比例谐振控制及其网压前馈问题分析

, PP. 56-63

Keywords: 并网逆变,网压前馈,比例谐振控制器,静止坐标系控制

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Abstract:

静止坐标系下的比例谐振控制因其具有对特定频率响应速度快、不存在耦合项并易实现谐波补偿这三个显著特点得到了广泛的关注,并被应用于多种分布式发电系统当中。本文对静止坐标系下的比例谐振控制进行了说明与分析,同时针对比例谐振控制的特点,提出了一种带有比例系数的正序网压前馈控制方法。该方法通过引入正序网压前馈环节,相比传统的比例谐振控制方法进一步提高了系统的动态响应能力,在逆变器公用接入点(PCC)电压畸变的情况下,正序网压前馈环节降低了网压畸变对并网电流造成的负面影响,并得到了实验的验证。

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