UNINTERRUPTIBLE POWER SUPPLY WITH ENERGY STORAGE SYSTEM - POWER CONDITIONING SYSTEM

摘要

The present invention relates to an uninterruptible power supply with an energy storage system-power conditioning system (ESS-PCS), comprising: an inverter; and an inductor-capacitor-inductor (LCL) filter. The inverter converts a direct current (DC) power supplied from a battery for charge in a discharge mode into a single phase or three-phase alternating current (AC) power to output the AC power and performs full-wave rectification to an input power in a charge mode to be supplied to the battery for charge. The LCL filter is connected with the inverter in the discharge mode to generate a single phase or three phase similar sine wave to be supplied to a load and is connected with the inverter in the charge mode to perform full-wave rectification and boosting to the sine wave supplied from a grid. According to the present invention, compared to a separately installed power supply, the uninterruptible power supply has a smaller size and allows reduction of costs.