单相UPS逆变器的多环控制策略研究

Research on Multiple-loop Control Strategy for Single-phase UPS Inverter

在单相不间断电源(UPS)控制系统中,UPS的被控量是交流量,常用的控制算法很难对交流量实现无差控制,因此提出了一种多环控制策略,以提高单相UPS逆变器的静态和动态特性。采用比例谐振调节器控制逆变器的输出电压,极大地提高了系统的静态特性;采用适当的前馈负载电流和负载电压,有效地改善了单相UPS逆变器的动态特性。建立了单相UPS逆变器的数学模型,并给出了比例调节器和比例谐振调节器的设计方法。理论分析和一台800 W逆变器样机的实验结果证明了该控制方案的可行性。

The variable controlled is an AC one in control system of a single phase uninterruptible power supply （UPS） inverter.Zero static state error is hardly resized by usual control algorithms.To improve static state performance and dynamic performance, a multiple-loop control strategy is proposed.The output voltage of a single phase UPS inverter is controlled through proportional resonant controller, the static state performance is greatly enhanced.Load＇s current and voltage are forward fed,the dynamic perform of a single phase UPS inverter is improved.The mathematic model is derived and design methods of proportion controller and proportional resonant controller is presented, too.Theoretic analysis and experimental results on 800 W prototype verify the proposed control method is feasibility.