LCL型并网逆变器的改进电流控制技术  

Improved Current Control Technology for LCL Type Grid-Connected Inverters

作　　者：许佳 XU Jia(Xi′an Institute of Electromechanical Information Technology,Xi′an 710065,China)

机构地区：[1]西安机电信息技术研究所,陕西西安710065

出　　处：《电工技术》2022年第14期21-24,共4页Electric Engineering

摘　　要：针对传统有源阻尼控制在抑制LCL并网逆变器系统谐振时带来的系统稳定性不佳的问题,提出了基于电容电流比例积分反馈的双闭环有源阻尼控制策略。通过增加积分环节,进而改善系统的幅值裕度和相角裕度,使得整个系统不仅能有效地避免进网电流谐振和实现进网电流的高功率因数,而且具有良好的稳态和动态性能。最后通过仿真验证了理论分析的正确性和控制策略的可行性。Aiming at the problem of poor system stability caused by traditional active damping control when suppressing the resonance of LCL type grid-connected inverter system,a double closed-loop active damping control strategy based on the proportional integral feedback of capacitance current is proposed.By increasing the integration link,the amplitude margin and phase angle margin of the system are improved,so that the whole system can not only effectively avoid the resonance of the output current and achieve a high power factor,but also have good steady-state and dynamic performance.Finally,the correctness of the theoretical analysis and the feasibility of the control strategy are verified by simulation.

关 键 词：LCL滤波器 并网逆变器 谐振 电容电流反馈 双闭环控制 

分 类 号：TM732[电气工程—电力系统及自动化]