Abstract: Provided is a power system that can arbitrarily set output power while stabilizing output voltages. Connection terminals 13 and 23 of lower power sources 1 and 2 are connected to external connection terminals 41 in parallel. Voltage measurement section 31 measures voltage values of external connection terminals 41 as measured voltage values. Power converters 12 and 22 measure power supply capacities of lower power sources 1 and 2, respectively. Output instruction section 32 adjusts power or currents flowing through connection terminals 13 and 23 based on the measured voltage values and the power supply capacities so that the measured voltage values are included in a predetermined voltage range.

Abstract: Provided is an AC power supply apparatus including a first AC power supply generation unit that generates a first AC voltage for a first terminal corresponding to a u-phase; a second AC power supply generation unit that generates a second AC voltage for a second terminal corresponding to a v-phase; a third AC power supply generation unit that generates a third AC voltage for a third terminal corresponding to a w-phase; and a control unit that controls a phase and an amplitude of each of the AC voltages output from the first to third AC power supply generation units, in such a manner that the amplitude and the phase of each of the first to third AC voltages output to the first to third terminals, respectively, match an amplitude set value and a phase set value preliminarily set for each of the AC voltages.

Abstract: A power conditioner according to an exemplary aspect of the present invention includes a first converter that converts a first DC voltage supplied from an external power supply into a second DC voltage, an inverter that converts the second DC voltage into an AC voltage and outputs the AC voltage to an external line so as to keep receiving power by the external line from a supply source system in a predetermined range, and an energy management unit that stops operations of the first converter and the inverter at predetermined time previously determined based on a magnitude of load power consumed by a load connected to the external line.