Suppression Method of High-Frequency Oscillation by Improved Notch Filter for Multi-Parallel Inverters Connected to Weak Grid
Yang Ling1, Chen Yandong1, Luo An1, Huai Kunshan2
1. National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China 2. Guangzhou Power Supply Co. Ltd Guangzhou 510620 China
Abstract：When multi-parallel inverters are connected to weak grid at the same point of common coupling, the interaction between multi-parallel inverters and the grid is a potential threat to the stable and reliable operation of the system. The traditional grid-side inductance current feedback control method with notch filter can suppress the high-frequency oscillation of multi-parallel inverters in a certain extent. But it will lead to the stability reduction and even instability. Thus, the suppression method of high-frequency oscillation by improved notch filter is proposed for multi-paralleled inverters. This method not only effectively restrains multi-parallel inverters' harmonic current into the grid, and avoids the high-frequency oscillation of impedance network, but also improves the phase margin of the system, and ensures the sufficient stability and better dynamic performance of the system in the weak grid. Considering the notch depth and dynamic performance of the improved notch filter, the appropriate control parameters are selected. Experimental results verify the validity of the proposed method.
杨苓, 陈燕东, 罗安, 怀坤山. 多机并联接入弱电网的改进型带阻滤波器高频振荡的抑制[J]. 电工技术学报, 2019, 34(10): 2079-2091.
Yang Ling, Chen Yandong, Luo An, Huai Kunshan. Suppression Method of High-Frequency Oscillation by Improved Notch Filter for Multi-Parallel Inverters Connected to Weak Grid. Transactions of China Electrotechnical Society, 2019, 34(10): 2079-2091.
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2019, Vol. 34 
