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三相光伏并网逆变器电网高阻抗谐振抑制方法
方刚1, 杨勇1,2, 卢进军1, 刘滔1, 蒋峰1
1.江苏固德威电源科技股份有限公司,江苏苏州215011;2.苏州大学 轨道交通学院,江苏苏州215137
摘要:
针对电网电压高阻抗LCL滤波器谐振问题,提出一种虚拟电阻+电容有源阻尼方法。该方法将虚拟电阻和电容串联之后与三相光伏并网逆变器的滤波电容并联。通过滤波电容电压得到虚拟电阻和电容支路的电流,将虚拟电阻和电容支路的电流作为LCL滤波器谐振抑制有源阻尼电流给定。通过逆变侧电流闭环控制,实现对三相光伏并网逆变器电网高阻抗LCL滤波器谐振抑制。建立15 kW的T型三电平三相光伏逆变器平台,对所提有源阻尼方法进行稳态实验,实验结果验证所提方法的可行性和正确性。
关键词:  电网高阻抗  三相光伏并网逆变器  虚拟电阻和电容  有源阻尼  谐振  滤波器
DOI:10.16081/j.issn.1006-6047.2018.02.014
分类号:TM464;TM615
基金项目:国家自然科学青年基金资助项目(51407124);中国博士后科学基金资助项目(2015M581857); 苏州市前瞻性应用研究项目(SYG201640)
Resonance suppression method of high impedance power grid for three-phase photovoltaic grid-connected inverters
FANG Gang1, YANG Yong1,2, LU Jinjun1, LIU Tao1, JIANG Feng1
1.Jiangsu GoodWe Power Supply Technology Co.,Ltd.,Suzhou 215011, China;2.School of Rail Transportation, Soochow University, Suzhou 215137, China
Abstract:
A virtual resistance and capacitor active damping method is proposed due to LCL filter resonance under high impedance power grid condition. Firstly, the virtual resistance and capacitor are connected in series and then connected with filter capacitor of three-phase photovoltaic grid-connected inverters in parallel. The current of virtual resistance and capacitor branch is acquired through the voltage of filter capacitor, to be taken as the active damping current reference for resonance suppression of LCL filter. LCL filter resonance suppression is achieved for three-phase photovoltaic grid-connected inverters under high impedance power grid condition through inverter-side current closed-loop control. The experimental platform of T-type three-level three-phase photovoltaic inverters rated at 15 kW is established. Steady performance of the proposed active damping method is tested, and verified by experimental results to confirm the effectiveness and validity of the proposed method.
Key words:  high impedance power grid  three-phase photovoltaic grid-connected inverters  virtual resistance and capacitor  active damping  resonance  electric filters

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