Inverter output voltage control method - requires digital control of voltage in each phase using control variable formed from difference between actual and setpoint phase voltage

摘要

A procedure for controlling the voltage at the output of an inverter with a controller in each phase has the following features. The effective voltage value is controlled. The control process is digital. One command variable is passed to each controller. Each is the sum of a given fixed value and a cyclically evaluated matching value for the respective phase. This matching value is the difference between the actual effective output voltage for the respective phase and its setpoint value. Each difference is passed to an integrator, whose output is multiplied by a proportionality factor. The voltage in each phase is constantly sampled at discrete times.