直流固态变压器自抗扰控制

直流固态变压器(DCSST)是高压直流配网与低压直流微网互连的关键设备,为了提高输出电压的抗扰能力,提出基于自抗扰控制(ADRC)的输出直流电压控制方法。通过DCSST电路模型分析进行控制器的设计,并基于线性自抗扰控制(LADRC)结构通过极点配置给出依赖于增益带宽的参数整定方法,并将此得到的参数应用于非线性ADRC的状态反馈增益以及状态观测增益,可实现系统快速无超调响应。实验结果表明文中所提控制策略及ADRC参数整定方法可行,DCSST输出电压采用ADRC控制比采用传统PI控制具有更快的响应速度及更强的抗扰能力。

Active Disturbance Rejection Control of DC Solid State Transformer

In order to improve the disturbance rejection ability of DC solid state transformer (DCSST) which is applied as the key connection device between high voltage DC distribution grid and low voltage DC microgrid, a novel control strategy based on active disturbance rejection control (ADRC) is proposed to stabilize the DC output voltage. The controller is designed based on the analysis of the DCSST circuit model, the tuning method that is dependent on gain bandwidth is given through pole assignment based on linear active disturbance rejection control (LADRC) scenario, and obtained parameters are applied to state feedback gain and state observation gain of nonlinear ADRC to achieve rapid non-overshoot response of system. Experiment results show that proposed control strategy and ADRC parameter tuning method are feasible, and the DCSST output voltage achieves faster response speed and stronger disturbance rejection ability than that of conventional PI control.