状态空间设计法的并网逆变器的控制策略

Control strategy of grid-connected converter of state-space design method

在分析并网逆变器闭环控制系统的控制目标和性能要求的基础上,提出了PI控制和鲁棒控制策略,并对两种控制策略进行分析,推导了两种策略下的闭环传递函数,得出PI控制无法零稳态跟踪正弦参考信号,输出功率因数不能达到1,且不能按要求输出指定电流。而基于状态空间设计法的鲁棒控制策略则能零稳态误差跟踪非衰减输入,并能抑制非衰减扰动。搭建了单相并网逆变器的模型并进行仿真,仿真结果验证了该控制策略的可行性。

Based on the analysis of the closed - loop control of grid - connected inverter control objectives and performance requirements, PI control and robust control strategy was proposed. And two control strategies were analyzed. The closed loop transfer function under the two strategies was derived. The PI control can not be zero steady state tracking the sinusoidal reference signal. The output power factor can not reach 1, specified output current can not be required. However robust control strategy based on the state-space design method can zero steady state error tracking the non -attenuation input and can inhibit the non - attenuation disturbance. A single - phase grid - connected inverter model was built to simulate. The simulation results demonstrate the feasibility of the control strategy.