直流微电网内双向DC-DC变换器的自抗扰控制研究

Research on active disturbance rejection control strategy of bidirectional DC-DC converters in dc microgrid

针对传统PI控制直流微电网中双向DC-DC变换器造成的输出电压波动大、动态响应缓慢的问题。设计了一种基于干扰补偿的自抗扰控制器(ADRC),采用电压电流双闭环控制策略。其中,外部电压环采用非线性ADRC,提高了控制器的鲁棒性,内部电流环采用控制参数少的线性ADRC,解决了调参困难的问题。对所建控制器进行MATLAB/Simulink仿真,结果表明,ADRC控制解决了传统PI控制中超调量与响应时间难以兼顾的矛盾,与PI控制器相比,在响应速度和抗干扰能力上有显著提高,有效实现了对母线电压的控制。

Aiming at the problem of slow dynamic response and large fluctuation of output voltage caused by the bidirectional DC-DC converters in the traditional PI controlled DC microgrid.An active disturbance rejection control(ADRC)is designed,which is based on disturbance observation compensation.The control method of voltage outer loop and double current inner loop are adopted.Among them,the external voltage loop is nonlinear ADRC,which improves the robustness of the controller.The inner loop is linear ADRC with less control parameters,which solves the problem of difficult adjustment.The MATLAB/Simulink simulation of the built controller shows that the ADRC control solves the contradiction between overshoot and the response time in the traditional PI control.Compared with the PI controller,the response speed and anti-interference ability are significantly improved.,and effectively control the bus voltage.