电测与仪表Issue(9)：70-76,95,8.
多台并网逆变器并联运行低频谐振及负阻尼补偿方法研究
Research on low-frequency resonance of multi-parallel grid-connected inverters and negative damping compensation method
摘要
Abstract
This paper investigates the low-frequency resonance issue of multi-parallel grid-connected inverters from the perspective of admittance .Due to the effect of software phase-locked-loop ( SPLL) , the output admittance of grid-con-nected inverters with an LCL filter contains the negative damping at the low-frequency region .And with the number of parallel inverters increasing , the resonant frequency of the impedance network composed of grid-connected inverters and inductive grid impedance is decreased .When located at the low-frequency region , the negative damping of the output admittance will easily lead to system instability .In order to eliminate the negative damping and damp the reso-nance, the feed-forward of grid voltage is introduced to the current command value .Furthermore, the minimum theo-retical value of feed-forward compensation coefficient is derived on the basis of minimum effects on other frequency characteristic of the output admittance .Finally, the experimental results verify the correctness of theory analysis and the effectiveness of negative damping compensation method .关键词
并网逆变器/输出导纳/软件锁相环/负阻尼/低频谐振Key words
grid-connected inverter/output admittance/software phase-locked-loop (SPLL)/negative damping/low-frequency resonance分类
信息技术与安全科学引用本文复制引用
李小强,王凯,耿乙文,伍小杰..多台并网逆变器并联运行低频谐振及负阻尼补偿方法研究[J].电测与仪表,2015,(9):70-76,95,8.基金项目
江苏省普通高校研究生科研创新计划项目 （）
