| 摘要 |
PROBLEM TO BE SOLVED: To reduce a loss caused by an inverter, in the case that an equipment is used for leveling a load factor and has a secondary battery. SOLUTION: DC input terminals of a large capacity inverter 15, which has the same capacity as the rated one and those of a medium capacity inverter 16 having a capacity corresponding to a decrease in voltage of a secondary battery 17 are connected in parallel to the secondary battery 17, and the output voltages output from AC output terminals of these two inverters 15, 16 are combined by linkage transformers 13, 14 whose primary sides are serially connected to each other, and then the combined voltage is supplied to a system 12. The large capacity inverter 15 is a rectangular wave inverter having a small switching loss, and the medium capacity inverter 16 is a pulse width modulation(PWM) inverter having good responsiveness. Therefore, a good responsiveness is secured, and loss can be reduced compared to that in a configuration constituted of a single PWM inverter, thereby increasing the efficiency. |
