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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 认领 被引量:2

Suppression Method of High-Frequency Oscillation by Improved Notch Filter for Multi-Parallel Inverters Connected to Weak Grid
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摘要 多机接入弱电网的同一公共耦合点时,多机与电网之间的交互作用对系统的稳定可靠运行是一个潜在威胁。传统的引入带阻滤波器的网侧电感电流反馈控制方法能在一定程度上抑制多机并联的高频振荡,但会导致稳定性降低,甚至不稳定。为此,提出一种多机并联的改进型带阻滤波器高频振荡抑制方法,该方法不仅能有效地抑制多机并联的谐波电流流入电网,避免阻抗网络的高频振荡现象发生,而且能提高系统的相位裕度,保证系统在弱电网下具有足够的稳定和较好的动态性能。考虑改进型带阻滤波器的陷波深度和动态性能,选取合适的控制参数。实验结果验证了所提方法的有效性。 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.
作者 杨苓 陈燕东 罗安 怀坤山 Yang Ling;Chen Yandong;Luo An;Huai Kunshan(National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China;Guangzhou Power Supply Co. Ltd Guangzhou 510620 China)
出处 《电工技术学报》 EI CSCD 北大核心 2019年第10期2079-2091,共13页 Transactions of China Electrotechnical Society
基金 国家重点研发计划(2017YFB0902000) 国家自然科学基金(51577056) 国家电网公司科技项目(SGXJ0000KXJS1700841)资助。
关键词 弱电网 多逆变器并联 高频振荡 改进型带阻滤波器 阻抗重塑 Weak grid multi-parallel inverters high-frequency oscillation improved notch filter impedance reshaping
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