并联改进VSG功率环流的分析与抑制策略研究
Analysis and suppression strategy of parallel improved VSG power circulation
周子淳 1何国锋 1董燕飞 1林俊芳1
作者信息
- 1. 三峡大学 电气与新能源学院,湖北 宜昌 443002;河南城建学院 电气与控制工程学院,河南 平顶山 467036
- 折叠
摘要
为了抑制孤岛模式下光伏微电网逆变器之间由于输电线路阻抗差异所引起的环流问题,文章提出了一种用于多逆变器并联系统的改进的虚拟同步发电机(Virtual Synchronous Generator,VSG)控制策略.首先,基于传统的VSG控制框图,通过引入线路功率反馈环节,使每台逆变器分别抵消其输电线路上的功率损耗,以提高有功、无功功率均分精度,并降低输出电压跌落,改善电能质量;然后,通过引入同步控制器,减小逆变器并联瞬间的电流冲击,降低多逆变器并联系统之间的瞬时环流;最后,通过仿真与实验验证了所提控制策略的有效性.
Abstract
An improved virtual synchronous generator(VSG)control strategy for multi-inverter parallel system is proposed in this paper to suppress the circulating current caused by the impedance difference of transmission lines between PV microgrid inverters in islanded mode.Firstly,based on the traditional VSG control block diagram,each inverter counteracts the power loss on the transmission line by introducing the line power feedback,so as to improve the active and reactive power sharing accuracy,reduce the output voltage drop,and improve power quality.Then,the synchronous controller is introduced to reduce the instantaneous current and suppress the instantaneous circulating current between the multi-inverter parallel system.Finally,the effectiveness of the proposed control strategy is verified by simulation and experiment.
关键词
孤岛模式/多逆变器并联系统/虚拟同步发电机/环流抑制Key words
island mode/multi-inverter parallel system/virtual synchronous generator/circulation suppression引用本文复制引用
基金项目
河南省自然科学基金面上项目(222300420400)
出版年
2024
国家科技期刊平台
NSTL
万方数据