基于无差拍电流内环的逆变控制算法研究

Research on Control Algorithm Based on Deadbeat Current Inner-Loop for Inverters

研究了一种基于电感电流无差拍内环的电压电流双闭环单相逆变控制算法。通过电感电流无差拍内环控制用来实现输出输入电压与电流内环的解耦,提高了内环的跟踪速度。在离散域下分析了无差拍模型电感参数匹配范围,针对数字控制延时降低了模型电感参数匹配范围并引起系统稳定裕度变小的的问题,提出了改进型的无差拍电流内环控制,提高了系统的稳定裕度,最后通过仿真和实验证明了该控制算法的可行性和优越性。

This paper proposes an instantaneous dual-loop control algorithm based on deadbeat current inner-loop for single phase off-grid inverters. The deadbeat control of inductor current is adopted to eliminate or weaken the disturbance induced by the out and input voltage, improving the tracking speed of inner-loop. By applying the z-transformation tech- nique, the stability margin and the matching range between the deadbeat model inductance and actual inductance is proved to he reduced when the control delay exists. To solve the problem, an improved deadbeat control algorithm is pro- posed. Finally, the validity of the proposed algorithm is demonstrated by means of simulation and experimental results from a single-phase inverter.