采用功率内环和电压平方外环的电压型PWM整流器

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功率控制数学模型,基于功率前馈解耦,解决了有功功率和无功功率互为耦合问题.为克服整流器电流控制策略、直接功率控制策略及非线性控制策略的不足,提出了采用功率内环、直流电压平方外环电压型PWM整流器的新控制策略.由于采用直流电压平方外环,提高了整流器直流电压跟踪和功率跟踪能力,使系统具有响应快、稳定性好、抗负载扰动能力强及结构简单的优点.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.

Three-phase voltage-type PWM rectifiers with inner power loop and outer voltage square loop

The independent control of instantaneous active power and reactive power is obtained based on the power control mathematical model of voltage-type PWM rectifiers in synchronous dq coordinates and power feedforward decoupling.In order to overcome the defects of current control strategy,direct power control strategy and nonlinear control strategy for voltage-type PWM rectifiers,a new control strategy using inner power loop and outer voltage square loop is proposed.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 new control strategy is proved feasible by Simulink simulation under nominal load and load disturbance.