引用本文: | 杜燕,言明明,杨向真,张梦梦,孙青青,苏建徽.多目标约束下逆变器阻抗的电流矫正方法[J].控制理论与应用,2022,39(4):701~710.[点击复制] |
DU Yan,YAN Ming-ming,YANG Xiang-zhen,ZHANG Meng-meng,SUN Qing-qing,SU Jian-hui.Current correction method for grid-connected inverter impedance under multi-objective constraints[J].Control Theory and Technology,2022,39(4):701~710.[点击复制] |
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多目标约束下逆变器阻抗的电流矫正方法 |
Current correction method for grid-connected inverter impedance under multi-objective constraints |
摘要点击 1437 全文点击 534 投稿时间:2020-12-14 修订日期:2021-06-28 |
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DOI编号 10.7641/CTA.2021.00897 |
2022,39(4):701-710 |
中文关键词 并网逆变器 弱电网 锁相环 稳定性 阻抗重塑 |
英文关键词 grid-connected inverter weak grid phase-locked loop stability impedance reshaping |
基金项目 国家重点研发计划项目(2018YFB0904102), 高等学校学科创新引智计划(111计划)(BP0719039)资助. |
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中文摘要 |
弱电网下锁相环与电网阻抗间的耦合会造成系统不稳定. 含前置低通滤波器锁相环的并网逆变器虽能改
善并网系统稳定性, 但存在并网电流相位滞后问题. 本文通过将滤波器从锁相环支路“拆分”, 提出了一种电流二
阶校正的阻抗重塑法, 以基波电流控制性能、相角裕度、低频幅值为约束建立了多目标约束函数, 单独优化设计了
二阶校正环节参数, 提高了并网逆变器的弱网稳定性, 实现弱电网下的单位功率因数并网. 最后在StarSim实验平台
验证了所提控制方法的有效性. |
英文摘要 |
Under a weak grid, the system instability can be jeopardized by the interaction between the phase-locked loop
and the grid impedance with increasing impedance. Although the stability of grid-connected system can be improved by a
phase-locked loop with a serial low-pass filter (LPF), it leads to a lag phase of injected grid current. Based on the equivalent
transformation and frequency division optimization, an impedance reshaping method with second-order correction of the
current is proposed. Then a multi-objective constraint function is established with the constraints of base-wave current
control performance, phase angle margin, and low-frequency amplitude. And the parameters of the second-order correction
link are optimally designed by this function. The method improves the weak grid stability of the grid-connected inverter
and realizes the grid connection with unit power factor under the weak grid. Finally, the effectiveness of the proposed
control method was verified on the StarSim experimental platform. |
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