Method and apparatus for stabilized integral control of static power frequency changers.

摘要

Static power frequency changer apparatus for synthesizing a desired output waveform from a multiphase sinusoidal AC source uses controlled switches (e.g., thyristors,) and a reference voltage waveform. A modified integral error control is used so as to stabilize intervals between firing signals; a linear or exponential ramp generator may be used to stabilize a main generator. Firing signals for the power switches in the static power frequency changer are generated by comparing the integral of the output waveform ripple voltage to a repetitively generated stabilizing signal phase locked to, but having a time function independent of the time of component waveforms of the output voltage. The stabilizing signal which changes in magnitude in one direction with time is reset to an initial level each time a firing signal is generated.