Unity power factor PWM rectifier reducing the number of sensors

In this paper, a new control method of a reversible PWM rectifier is discussed, where the input voltage sensor and the DC current sensor are eliminated; the performance corresponds to that of the original system can be obtained by estimating the input voltage and DC load current from measured input current and DC output voltage. By using this method, the simplified circuit configuration with half number of required sensors and reduction of the cost is realized. Because when the system has an inverter load, the DC load current includes the high switching frequency components, it is impossible to use directly the DC load current for the feed-forward control. Therefore, the treatment of the DC load current for the feed-forward control is also investigated