基于二阶相位补偿器的LCL型并网逆变器电容电流反馈有源阻尼策略
CAPACITOR CURRENT FEEDBACK ACTIVE DAMPING STRATEGY FOR LCL GRID CONNECTED INVERTER BASED ON SECOND-ORDER PHASE COMPENSATOR
孙标广 1杨泽昆1
作者信息
- 1. 河南理工大学电气工程与自动化学院,焦作 454003;河南省煤矿装备智能检测与控制重点实验室,焦作 454003
- 折叠
摘要
在控制延时环节的影响下,并网逆变器系统出现了有效阻尼区域过窄的问题.鉴于此,提出在电容电流反馈支路中加入新型二阶相位超前补偿环节,补偿后电容电流反馈有源阻尼(CCFAD)的有效阻尼边界频率从fs/6提高至0.34fs.优化电容电流反馈系数的参数设计方法,并在离散域下分析所提控制策略的闭环极点轨迹.通过与已有策略仿真和实验结果的对比分析,结果表明在电网阻抗增加、滤波器参数宽范围波动的工况下,所提策略具有更高的鲁棒性.
Abstract
Under the influence of the control delay link,the grid-connected inverter system has the problem of too narrow effective damping region.In view of this,it is proposed to add a novel second-order phase overrun compensation link in the capacitive current feedback branch,and the effective damping boundary frequency of the capacitive current feedback active damping(CCFAD)is improved from fs/6 to 0.34 fs after the compensation.The parameter design method of the capacitive current feedback coefficients is optimised,and the closed-loop pole trajectories of the proposed control strategy are analysed in the discrete domain.Comparison and analysis with simulation and experimental results of existing strategies show that the proposed strategy has higher robustness under the operating conditions of increased grid impedance and wide range of filter parameter fluctuations.
关键词
延时/并网逆变器/补偿/参数设计/鲁棒性Key words
delay/grid-connected inverter/compensation/parameter design/robustness引用本文复制引用
出版年
2024
NETL
NSTL
万方数据