Patent ID: 9077207
Filing Date: 2015-07-07
Classification: H02J,H02P

Abstract:
1. A parallel running control apparatus for an inverter generator A having first, second and third windings wound around an alternator driven by an engine, first, second and third inverters each connected to the first, second and third windings to convert alternating current outputted from the first, second and third windings into direct and alternating current through switching elements to output the converted alternating current, first, second and third controllers each adapted to control turning ON/OFF of the switching elements of the corresponding first, second and third inverters and connected to enable to be communicated with each other, and an output terminal connected to terminal groups connected to the first, second and third inverters to output the converted alternating current as one of a U-phase, V-phase, and W-phase outputs and connected to a neutral terminal of the terminal groups; wherein the inverter generator A is adapted to run in parallel with at least one inverter generator B, which is configured to be same as the inverter generator A, to output a three-phase alternating current; each of the first, second and third controllers has a voltage/phase detector that detects voltage and phase of the converted alternating current inputted into the corresponding first, second and third inverters from the generator B, and when U-phase, V-phase and W-phase terminals of the output terminal are connected to the corresponding U-phase, V-phase and W-phase terminals of the generator B via a connection cable, controls turning ON/OFF of the switching elements of the first, second and third inverters such that the outputs from the first, second and third inverters are synchronized with the detected voltage and phase; and the first controller determines that the generator B was stopped when at least one of phase differences between the converted alternating current output from the first inverter and the converted alternating current output from the second and third inverters becomes greater than or equal to a predetermined value.