Power conditioner for fuel cell system

摘要

A highly-efficient power conditioner for a residential cogeneration system has been developed which is composed of two booster circuits and an inverter for generating sinusoidal waveforms which is capable of maintaining a high efficiency over a wide range of input voltage. The two booster circuits are connected in series for their output. Their input can be switched between parallel and series connections according to whether the input voltage is relatively low or high. The booster circuits can thus adapt to a wide range of input voltage (12 - 50 V). The following inverter for generating sine waves can convert direct-current input power into alternating power with controlled current and can output up to I kW. To this inverter, we added a linkage protection device similar to that used in the power conditioner for photovoltaic generation in accordance with the system linkage guideline. We also made it possible to control the inverter output voltage according to the fuel cell capacity by linking the designated value of output current with the generation control of the fuelT cell.