佟云剑;沈健;刘鸿鹏;王卫;

• 1:哈尔滨工业大学电气工程及自动化学院

摘要(Abstract)：

传统独立光伏发电采用电压型控制,并网光伏发电采用电流型控制,无法实现运行模式的无缝切换。为此,提出光伏发电系统在2种运行模式下都采用电压型控制,避免控制策略切换所引起的冲击。针对光伏发电系统的特点,分别设计了光伏逆变器在孤岛运行、并网运行及模式切换时的下垂控制策略。将下垂控制进行改进,通过动态平移下垂曲线,使光伏逆变器并网运行时能够始终输出最大有功功率,抑制不同情况下的功率偏移,同时维持直流母线电压稳定,孤岛运行时能够跟踪电网运行状态,减小并网瞬间的冲击。仿真结果和实验结果均验证了所提控制策略的有效性,光伏逆变器在孤岛模式及并网模式都能够满足稳态运行要求,模式切换暂态过程平滑无冲击。

关键词(KeyWords)： 光伏逆变器;电压型控制;下垂控制;无缝切换

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 佟云剑;沈健;刘鸿鹏;王卫;

Email:

DOI: 10.13335/j.1000-3673.pst.2014.10.028

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