万晓凤;胡海林;聂晓艺;余运俊;曾繁鹏;

• 1:南昌大学信息工程学院
• 2:江苏林洋能源股份有限公司

摘要(Abstract)：

在电网电压不平衡并网逆变器瞬时功率数学模型基础上,分析了传统虚拟同步发电机(virtual synchronous generator,VSG)控制在电网电压不平衡时存在的问题:逆变器输出电流三相不平衡,输出有功功率及无功功率出现2倍电网频率波动,提出了一种改进型VSG控制策略。改进后的控制策略在dq坐标系下,利用平衡电流VSG控制得到基准正序电流指令,结合电网电压不平衡参数以及瞬时功率数学模型,得到不同控制目标下,并网逆变器正、负序电流指令值,并分别对正、负序电流指令进行跟踪得到正、负序电压调制信号,将正、负序电压调制信号合成为最终调制信号。改进后的VSG控制策略不改变VSG控制机理,保留VSG原有控制特性,分别实现了输出电流三相平衡,抑制有功或无功功率2倍电网频率波动的控制目标。仿真及实验结果表明所提出控制策略的有效性。

关键词(KeyWords)： 虚拟同步发电机;电网电压不平衡;电流不平衡;有功及无功功率波动;正、负序电流

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(61563034);; 国家国际科技合作专项(2014DFG72240);; 江西科技落地计划(KJLD14006)~~

作者(Author): 万晓凤;胡海林;聂晓艺;余运俊;曾繁鹏;

Email:

DOI: 10.13335/j.1000-3673.pst.2016.3212

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