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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 will be realized. Because when the system has an inverter load, the DC load current includes the high switching frequency components, it will be 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.

SUMMARYIn this paper, a current sensorless MPPT control method for a stand-alone-type PV generation system is proposed. This control method offers advantages of the simplified hardware configuration and low cost by using only one sensor to measure the PV output voltage. When used as a stand-alone-type with a battery load, the experimental results show that the estimated values of PV output current are accurate, and the use of the proposed MPPT control increases the PV generated energy by 16.3% compared to the conventional system. Furthermore, the authors clarified that the proposed method has an extremely high UUF (useful utilization factor) of 98.7%.

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