可再生能源2016，Vol.34Issue(6)：815-820,6.
基于虚拟电阻的并网逆变器谐振抑制措施的研究
Research on method of resonance suppression for grid-connected inverter based on virtual resistor
摘要
Abstract
For the influence of grid impedance,the resonance will occur in the PV inverters which are connected to grid with LCL filters.To suppress the resonance of grid inverter,the damping method is usually adopted,including passive damping method and active damping one.Firstly,the passive damping control method is analyzed,in which the passive resistor is connected to the capacitor of LCL filter in series.The equivalent active damping method is derived from the above-mentioned passive damping circuit by the feedback of capacitor current of LCL filter.Meanwhile,the difference between active and passive damping is compared,and the corresponding relationships among damping coefficient,virtual resistor and feedback gain of filter capacitor are conducted successively.Then the closed-loop control mathematical modei of the resonant circuit is established.and the influence of virtual resistor on control system is studied.Finally,the presented control method is verified by experiments on 10 kW grid inverter.The experimental results show that the presented control strategy can effectively suppress the resonance between the grid inverter and the main grid.关键词
无源阻尼/有源阻尼/并网谐振/电容电流反馈/谐振机理Key words
passive damping/active damping, grid resonance/feedback by capacitance current/resonance mechanism分类
信息技术与安全科学引用本文复制引用
慕昆,何国锋..基于虚拟电阻的并网逆变器谐振抑制措施的研究[J].可再生能源,2016,34(6):815-820,6.基金项目
国家自然科学基金项目(61503122) （61503122）
河南城建学院基金资助项目(2015JBS009). （2015JBS009）
