LCL型光伏并网逆变器电流内环控制方法Inner Current Loop Control Method for Photovoltaic Grid-Connected Inverter With LCL Filter
李泽斌;罗安;田园;刘奇;谢龙裕;徐千鸣;
摘要(Abstract):
针对LCL型光伏并网逆变器存在的谐振问题,建立了电流内环的控制模型,并分析了其开环传递函数。由分析可知,采用逆变器输出电流反馈进行电流内环控制时,控制器中包含一个固有阻尼项,该阻尼项有利于提高控制系统的阻尼、抑制LCL滤波器的谐振。在此基础上,提出了一种基于逆变器输出电流反馈的准比例谐振(proportional resonant,PR)电流内环控制策略。该控制策略没有引入额外的无源阻尼和有源阻尼,仅使用逆变器输出电流反馈进行控制,便可有效抑制LCL滤波器的谐振问题,提高控制系统的稳定性。仿真和实验结果验证了所提控制策略的有效性。
关键词(KeyWords): 光伏并网逆变器;LCL滤波器;逆变器输出电流反馈;电流内环;准PR控制
基金项目(Foundation): 国家自然科学基金重点项目(51237003);; 中国与欧洲政府间国际合作计划项目(2010DFA61640)~~
作者(Author): 李泽斌;罗安;田园;刘奇;谢龙裕;徐千鸣;
Email:
DOI: 10.13335/j.1000-3673.pst.2014.10.024
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