电测与仪表2016，Vol.53Issue(24)：11-18,8.
三相并网逆变器闭环输出阻抗建模及其优化
Closed-loop output impedance modeling and optimization of three-phase grid-connected inverter
摘要
Abstract
Transformer leakage inductance and line impedance cause the actual power grid existing impendence which easi-ly leads to the deterioration of stability , even unstable as the output impedance of grid-connected inverter mismatches the impendence of the power grid .When we analyze the system stability using impedance stability criterion , the researching work on characteristic of closed-loop output impedance of the grid-connected inverter is critical .Firstly, the closed-loop output impedance model is established in stationary coordinate system , and the stability mechanism is studied when the power grid existing impedance .For the delay of PWM modulation and digital control system equivalent delay impacting on the closed-loop output impedance , this paper presents a method for optimizing the output impedance to increase the magni-tude of the closed-loop output impedance and improve the stability of the system .Using the optimized impendence method proposed in this paper, the stability of grid-connected inverter is analyzed and experimental validated in the case of RLC type grid impedance .Experimental results validate the correctness and effectiveness of proposed method .关键词
并网逆变器/闭环输出阻抗/延时/阻抗优化/稳定性Key words
grid-connected inverter/closed-loop output impedance/delay/optimized impedance/stability分类
信息技术与安全科学引用本文复制引用
夏帅,王凯,耿乙文,丁建佳..三相并网逆变器闭环输出阻抗建模及其优化[J].电测与仪表,2016,53(24):11-18,8.基金项目
江苏省高校自然科学研究面上项目 （）
