吴振奎,耿云涛,张继红,杨培宏.基于“虚拟负阻抗”的微网逆变器并联运行研究[J].电测与仪表,2019,56(10):21-26. Wu Zhenkui,Geng Yuntao,Zhang Jihong,Yang Peihong.Research on virtual negative impedance control of micro-grid inverters in parallel operation[J].Electrical Measurement & Instrumentation,2019,56(10):21-26.
基于“虚拟负阻抗”的微网逆变器并联运行研究
Research on virtual negative impedance control of micro-grid inverters in parallel operation
When low-voltage microgrid running in isolated mode,the conventional droop control is greatly influenced by line impedance to achieve a good consequent of current sharing.Virtual impedance is usually added in the controller to alleviate the circulating current,but the conventional virtual impedance usually increase the inverter output impedance and then causes a certain voltage drop，Due to the system resistive，it is difficult to correct the system impedance to pure sensibility;To solve this problem,A new virtual negative impedance method is proposed，Which take a virtual negative resistance to offset the resistive part of the system impedance,It can keep the inverter at a lower output impedance to reduce the system output voltage drop,then correcting the system impedance to be a pure inductance with the virtual inductance，it can improve the consequent of circulation inhibition.Simulations of two parallel inverters are carried out on MATLAB/Simulink,the result verify the superiority and feasibility of the proposed control strategy.
