Method for controlling output energy of a power system

摘要

A method for controlling output energy of a power system includes following steps: Using a controlling unit to detect a phase offset between voltage and current of an AC power outputted from the power system. When the power system enters an energy-storage cycle, the controlling unit makes a power conversion unit output the AC power having a first preset power factor and store a partial energy of an AC grid in an energy-storage unit when the AC power is in a reactive power area. When the power system enters an energy-release cycle, the controlling unit makes the power conversion unit output the AC power having a second preset power factor and release the energy stored in the energy-storage unit, wherein an average value of the power factor in the energy-storage cycle and the energy-release cycle is the same as a preset average power factor.

主权项

1. A method for controlling power output energy of a power system (1) applied to feed an alternative current (AC) power to an AC grid (3), the method comprising:
detecting a phase offset between an AC voltage and an AC current of the AC power outputted from a power conversion unit (10) of the power system (1) by a controlling unit (14), wherein the controlling unit (14) has a first preset power factor, a second preset power factor, and a preset average power factor; when entering an energy-storage cycle, the controlling unit (14) making the power conversion unit (10) output the AC power having the first preset power factor to the AC grid (3) and store a partial energy of the AC grid (3) in an energy-storage unit (12) when in a reactive power area of the AC power having the first preset power factor; when entering energy-release cycle, the controlling unit (14) making the power conversion unit (10) output the AC power having the second preset power factor and release the energy stored in the energy-storage unit (12), wherein the released energy and the AC power outputted from the power conversion unit (12) are fed to the AC grid (3); wherein an average value of a power factor in the energy-storage cycle and the energy-release cycle is the same as the average power factor.