基于虚拟导纳的LCL型并联有源电力滤波器鲁棒电流控制  

Robust current control of LCL-type shunt active power filter based on virtual admittance

作　　者：杨磊 张浙波[1,2] 杨敏 赵力航 陈新琪 年珩 赵建勇[3] 闫亮[3] 邓鎔峰 张迪 YANG Lei;ZHANG Zhebo;YANG Min;ZHAO Lihang;CHEN Xinqi;NIAN Heng;ZHAO Jianyong;YAN Liang;DENG Rongfeng;ZHANG Di(Zhejiang Energy R&D Institute Co.,Ltd.,Hangzhou 311121,China;Key Laboratory of Energy Conservation&Pollutant Control Technology for Thermal Power of Zhejiang Province,Hangzhou 311121,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江浙能技术研究院有限公司,浙江杭州311121 [2]浙江省火力发电高效节能与污染物控制技术研究重点实验室,浙江杭州311121 [3]浙江大学电气工程学院,浙江杭州310027

出　　处：《电力自动化设备》2024年第8期168-175,共8页Electric Power Automation Equipment

基　　金：浙江省自然科学基金资助项目(LY23E070002);浙能集团科技项目(ZNKJ-2020-021,ZNKJ-2022-078)。

摘　　要：基于电网电流和逆变侧电流的双环电流控制策略因其固有的有源阻尼作用而成为LCL型并联有源电力滤波器的研究热点,但控制回路中不同有源阻尼共存将导致系统特性难以确定。对此,通过虚拟导纳模型准确评估了系统的阻尼特性,发现其有源阻尼区域会随电网阻抗波动而变化,最大接近1/3采样频率;考虑LCL初始谐振频率处于不同的频率范围情况,利用开环极点及鲁棒性分析得到适用于不同情况的统一稳定性约束条件,并对应提出了一套鲁棒控制参数设计方法,从而充分保证电网阻抗波动下并联有源电力滤波器的稳定运行。在一台380V、45A的实验样机上验证了所提理论及控制策略的有效性。The dual-loop current control strategy based on grid current and inverter-side current is widely investigated for LCL-type shunt active power filter(SAPF)due to its inherent active damping effect,but different active damping exists in the control loop,resulting in uncertain system characteristics.To resolve this issue,the damping characteristics of the system are accurately evaluated by virtual admittance model,finding that its active damping region changes with grid impedance variation and approaches one-third of sampling frequency at most.Considering that the LCL initial resonant frequency is in different frequency ranges,the consistent stability constraint is subsequently derived through open-loop pole and robustness analysis,which is suitable for different cases,and a robust control parameter design method is accordingly proposed to ensure stable operation of SAPF under grid impedance variation.A 380 V and 45 A experimental prototype is established to validate the effectiveness of the theoretical analysis and the proposed control strategy.

关 键 词：LCL型并联有源电力滤波器 鲁棒电流控制 有源阻尼 稳定性 电网阻抗 

分 类 号：TN713[电子电信—电路与系统]