集成有源阻尼器功能的并网逆变器虚拟电阻补偿控制方法  

Virtual resistance compensation control method for grid-connected inverter integrated with active damper function

作　　者：史明明 姜云龙 史鸿飞 蒋天润 竺明哲 葛乐[2] SHI Mingming;JIANG Yunlong;SHI Hongfei;JIANG Tianrun;ZHU Mingzhe;GE Le(Electric Power Research Institute of State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 211103,China;School of Electric Power Engineering,Nanjing Institute of Technology,Nanjing 211167,China)

机构地区：[1]国网江苏省电力有限公司电力科学研究院,江苏南京211103 [2]南京工程学院电力工程学院,江苏南京211167

出　　处：《电力自动化设备》2024年第4期119-126,共8页Electric Power Automation Equipment

基　　金：国网江苏省电力有限公司科技项目(J2021008)。

摘　　要：有源阻尼器通过构造虚拟电阻提高接入弱电网中逆变器的稳定性,但虚拟电阻的准确性受开关频率限制,有源阻尼器的功能难以集成到常规的并网逆变器中,为此,提出一种虚拟电阻补偿控制方法。建立集成有源阻尼器功能的并网逆变器阻抗模型,分析虚拟电阻对提升系统稳定性的作用;阐明控制带宽和数字延时对虚拟电阻准确性的影响,针对并网逆变器易发生谐振稳定性问题的谐振频段,设计一种新的虚拟电阻补偿环节,显著提升了虚拟电阻的补偿精度。系统阻抗稳定性分析表明,所提方法虚拟出的阻抗具有良好的电阻特性。实验结果表明,集成有源阻尼器功能的并网逆变器接入系统后具有较好的阻尼谐振作用,显著提升了系统稳定性。The active damper improves the stability of the inverter connected to the weak grid by constructing the virtual resistance,but the accuracy of virtual resistance is limited by the switching frequency,the active damper function is difficult to be integrated into the conventional grid-connected inverters,so a com⁃pensation control method of virtual resistance is proposed.An impedance model of grid-connected inverter integrated with active damper function is established,and the effect of virtual resistance in enhancing sys⁃tem stability is analyzed.The influence of control bandwidth and digital delay on the accuracy of virtual resistance is clarified,aiming at the resonant frequency band where the grid-connected inverter easily generates resonant stability problems,a new virtual resistance compensation block is designed,which significantly improves the compensation accuracy of virtual resistance.The system impedance stability analysis shows that the virtual impedance achieved by the proposed method has good resistive characteristics.The experi⁃mental results show that the grid-connected inverter integrated with active damper function has good damping resonant effect,significantly improving the system stability.

关 键 词：有源阻尼器 并网逆变器 弱电网 稳定性 虚拟电阻 

分 类 号：TM46[电气工程—电器]