Based on the passive damping method of capacitor in parallel with resistor,the active damping method of virtual resistor in parallel with capacitor can complete the virtualization of shunt resistor using the control algorithm and realize the active damping of the resonant peak from the output filter through the capacitor current feedback. How-ever,the existing method of virtual resistor in parallel with capacitor cannot achieve a strict equivalence of shunt resis-tance,which leads to the problem of poor dynamic performance. To solve this problem,through the transformation of the control block diagram,an active damping control method of fully equivalent shunt resistor based on capacitor voltage and capacitor current feedback is proposed,thus realizing the strict equivalence of passive damping method of capacitor in parallel with resistor. At the same time,the active damping control method of fully equivalent shunt resistor is obtained through the analysis of dominant poles of the system. Compared with the method of virtual resistor in parallel with ca-pacitor based on the current loop,this method can effectively improve the damping ratio and response speed of the sys-tem while reducing the overshoot. Finally,simulation and experimental results verified the effectiveness of the proposed method.
关键词
有源阻尼法/全等效并联电阻/逆变器谐振抑制/动态性能
Key words
Active damping method/fully equivalent shunt resistor/inverter resonance suppression/dynamic performance
维普
万方数据