抄録
A new design method based on the linear-quadratic control theory is developed for the control of PWM rectifiers with sinusoidal input current. The PWM rectifiers are promising because they can supply DC power while keeping a sinusoidal AC current with unity in the fundamental power factor. There are two types, a voltage-source rectifier and a current-source rectifier. The former is required to simultaneously control both the fundamental power factor and DC voltage, while the latter does so for both the fundamental power factor and DC current. State feedback control is essentially suited for multi-input and multi-output systems such as those. Here a discrete-time optimal regulator is applied to their control because it provides a microprocessor-based robust feedback system without steady-state errors in response to step reference and/or disturbance change. The regulator is implemented using a digital-signal-processor. Experimental results demonstrate the validity.
