In three-phase three-wire system load

摘要

PROBLEM TO BE SOLVED: To provide a three-phase three-wire system load simulator capable of simplifying a structure and simulating various loads highly precisely.;SOLUTION: The load simulator includes a current source connected to an AC power supply of a three-phase three-wire system connection simulating a power distribution system that introduces a load current from the AC power supply in accordance with a current command. The simulator includes voltage detectors 102, 103 that respectively detect line voltages from among an a-phase, a b-phase, and a c-phase with the b-phase as a reference in three phases of an AC power supply 200 as analog quantities, an A/D converter 105 that converts the line voltages into digital quantities, a CPU 106 that calculates load current commands of the a-phase and the b-phase as digital quantities, based on the line voltages and prespecified loading doses, a D/A converter 107 that converts the calculated load current commands into the analog quantities, and two current sources 108, 109 that introduce the load currents of the a phase and the c phase from the power supply 200 responding to each of the load current commands.;COPYRIGHT: (C)2007,JPO&INPIT