三相电压型PWM整流器控制新技术的研究

Study on New Control Technology of Voltage-Source PWM Rectifier

根据电压型PWM整流器在同步旋转dq坐标系中建立的整流器电流控制数学模型,基于电流前馈解耦,解决了有功电流和无功电流互为耦合问题。为克服直流电压响应较慢、抗扰性较差的不足,提出了采用电流内环、基于滑模控制的电压外环电压型PWM整流器的新控制策略。由于采用滑模控制的电压外环,提高了整流器直流电压跟踪和电流跟踪能力,使系统具有响应快、稳定性好、抗负载扰动能力强的优点。文中给出了系统控制器的设计方法。通过正常负载及负载扰动情况下的计算机仿真,证明了新控制策略的可行性。

The independent control of instantaneous active power and reactive power is obtained based on the current control mathematical model of vohage-type PWM rectifiers in synchronous dq coordinates and power feedforward decoupling. In order to overcome the defects of direct current control strategy, a new control strategy using inner power loop is proposed and using sliding mode control method, the outer voltage control loop is set up. Good tracking properties of dc voltage and power of voltage-type PWM rectifiers are obtained by using the new strategy. The system using the new strategy has many advantages, such as fast response, good stability, load disturbance resistance, and simpler structure. The design method for a system controller is given. The feasibility of new control strategy is proved by Simulink simulation under normal load and load disturbance.