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光伏并网逆变器的阻抗重塑与谐波谐振抑制

DOI: 10.13334/j.0258-8013.pcsee.2014.27.001, PP. 4547-4558

Keywords: 分布式光伏,并网逆变器,虚拟电阻,网络阻抗重塑,串并联谐波谐振,谐振阻尼

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Abstract:

针对并网逆变器的输出阻抗重塑控制,及其在抑制分布式光伏发电系统谐波谐振中的应用进行研究。首先,以一个典型的分布式光伏并网发电系统为例,分单台并网逆变器和多台并网逆变器两种情况,定量分析系统内串并联谐波谐振的机理及其影响因素。其次,提出一种能重塑光伏并网逆变器高频输出阻抗的控制策略。利用基于二阶广义积分器的陷波器滤除并网电压/电流基波分量后,经过输出阻抗控制后反馈到其指令电流(或调制信号)中,从而重塑并网逆变器的输出阻抗。当重塑后的阻抗呈现足够大的阻性时,可有效抑制网络内的高频谐波谐振。最后,利用PSCAD/EMTDC的仿真结果和一个微电网的实验结果验证所提控制策略的正确性和有效性。

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