基于状态空间模型的双Buck逆变器复合控制

双Buck逆变器由于无桥臂直通、可靠性好等优点而被广泛应用,然而当负载突变时输出波形质量较差。在建立逆变器控制系统状态空间模型的基础上,引入了电流内环PI控制、电压外环重复控制的复合控制策略。其中,电流内环PI控制,可实现系统快速动态响应,解决负载突增输出电压跌落问题;电压外环重复控制提高系统稳态精度。相比传统PI双闭环控制,该复合控制策略下的系统可实现无静态误差,可有效提高控制精度及输出波形质量,增强抗负载突变扰动能力。仿真与实验结果验证了该方法的有效性及可行性。

Compound Control of Dual-Buck Inverter Based on State Space Model

Dual-Buck inverters are widely applied owing to their advantages such as no bridge straight through arm and good reliability. However, when the load change is abrupt, the quality of the corresponding output waveforms will be poor. In this paper, based on the state space model of an inverter control system, a compound control strategy with the inner current loop under PI control and the outer voltage loop under repetitive control is proposed. The former can realize rapid dynamic response of the system and solve the problem of output voltage drop caused by a sudden increase in load, while the latter can improve the system accuracy in steady state. Compared with the traditional PI double closed-loop control, it is shown that the system under the proposed compound control strategy can realize zero steady-state error and effectively improve the control accuracy as well as the quality of output waveforms, thus enhancing its capability of anti-load mutation disturbance. Simulation and experimental results verified the effectiveness and feasibility of the proposed method.