Inverter circuits for electrical machines

摘要

An inverter circuit comprises an inverter which can be configurable for controlling the supply of mains current from a grid to an electric machine in a start-up mode whereby the machine drives the prime mover for initialization. Thereafter the same inverter is reconfigurable as part of the circuit to supply reactive power to the grid when the machine is running as a generator powered by the prime mover.

主权项

1. An inverter circuit for an electrical machine, the inverter circuit comprising one or more contactors and an inverter having an input for connecting to a network and an output for connecting to an electrical machine or the network, the inverter being configurable to be connected to draw electrical power at its input from the network to run the machine as a motor in a start-up mode of the inverter, the inverter also being configurable to be connected to provide reactive power to the network in parallel with an electrical output of the machine by controlling the one or more contactors such that the output of the inverter is connected to the network via the one or more contactors when the machine is run as a generator in a grid operation mode of the inverter after the start-up mode of the inverter.