Research On Active Disturbance Rejection Control Strategies For Single-Phase PWM Rectifier

Single-phase PWM rectifier is more suitable than three-phase PWM rectifier for single-phase AC power input,so it has been widely used in electric vehicle charging,wind energy and other renewable energy grid-connected power generation and other fields.Therefore,this paper takes single-phase PWM rectifier as the research object,and studies its DQ current decoupling control strategy and direct power control strategy.Aiming at the problem of poor dynamic performance and inadequate anti-disturbance ability of PI controller used in traditional control strategy voltage outer loop,two new control strategies are proposed.The specific research contents are as follows:This paper select single-phase PWM rectifier as the research object and its control strategy is studied.The specific research content is as follows:The mathematical models of the single-phase voltage source PWM rectifier in different coordinate systems are established by analyzing its working principle.Four methods of constructing virtual components in single-phase system are introduced.And the principle and structure of ADRC are introduced in detail.The DQ current decoupling control algorithm of single-phase PWM rectifier is studied.According to the mathematical model of single-phase PWM rectifier,the principle of current decoupling control is obtained in current inner loop.In order to improve the problem of poor dynamic performance of traditional PI controller in voltage outer loop,a DQ current decoupling control strategy based on ADRC is proposed.And the design of ADRC controller in voltage outer loop is carried out according to the mathematical model.Finally,the simulation results show that the proposed control strategy has faster dynamic response and better anti-jamming ability.The direct power control algorithm of single-phase PWM rectifier is studied.Firstly,the power mathematical model of the rectifier is deduced,and then the control principle block diagram of the direct power control is obtained.Similarly,the ADRC is applied to the voltage outer loop control to overcome the drawbacks of the PI controller used in the traditional voltage outer loop,and the direct power control strategy based on ADRC is obtained.Finally,the simulation is carried out and the results proved that the proposed control strategy can improve the dynamic performance and anti-interference ability of the system.A low-power experimental platform of single-phase PWM rectifier is built,and the hardware and software design of the experimental platform are introduced respectively.Finally,the experimental results are analyzed and compared,which further proves the feasibility and effectiveness of the proposed control strategy.