三相并联逆变电源控制设计分析

Design and Analysis of Three-phase Parallel Inverter Control

研究分析三相并联逆变系统模型,介绍通过下垂控制策略降低环流大小。首先分析电感电流和电容电流两种反馈控制方式对并联逆变系统的影响,研究发现电容电流反馈控制方式具有良好的动态响应,而动态响应速度对于并联电源系统非常重要,故采用电容电流控制方式,该方式可对电容电流和输出电压进行解耦控制。线路阻抗等的因素易导致并联逆变系统产生较大的环流,为提高均分负载的效果,针对输出阻抗进行优化设计。所提出的反馈控制方式和输出阻抗设计不仅可提高输出电压精度,而且控制器设计简单,通过Matlab软件仿真和实验验证了所提出理论的可行性。

Research and analysis of parallel three-phase inverter system model, introduces the droop control strategy to reduce the size of circulation. First analyzed the impact of the inductor current and capacitor current feedback control mode on parallel inverter system, the study found that capacitor current feedback control method has good dynamic response, while the dynamic response speed is very important to parallel power supply system, so adopted the capacitance current control strategy, which can be decoupled control of capacitor current and output voltage. The line impedance factors easily lead to parallel inverter system have a large circurrent, in order to improve the load sharing effect, the paper according to output impedance optimization design. Feedback control mode and output impedance design were proposed which could not only improve the accuracy of the output voltage, and the controller has the advantages of simple design, through the Matlab simulation of software and experiments verify the feasibility of the theories proposed.