Power conversion method and apparatus for parallel connection of different types of AC power supplies with different capacities to common bus

摘要

In the power converter 100, one UPS (uninterruptible power supply) is further connected in parallel to the common bus 13 to which other power supply units are connected to increase the total power capacity of the bus 13.;The power conversion method includes changing an AC application voltage of a power inverter 13A used in one power supply unit 2A; Detecting a first change included in an AC output current of the one power supply unit 2A when the AC voltage of the power inverter 2A is changed; The optimum parameter (eK, X, IL) necessary to share the AC power to be obtained from the one power supply unit 2A with respect to the total output power that can be supplied to the load 12 from the common bus 13 is Processing the first change in the AC output current; And control the one power supply unit 2A to output an optimum voltage in response to the optimum parameter to achieve the power sharing operation for the one power supply unit 2A regardless of other power sharing for the other power supply unit 3A. It includes; step to do.