Analysis and design of a fast response three phase fixed frequency static power supply

Pulse width modulated voltage source inverters (PWM VSI) for uninterruptible power supply (UPS), parallel redundant system applications require fast acting inverter output current and voltage control. This paper describes a predictive current control method and a multivariable output state feedback voltage regulator for a proposed power supply system. The control methods provide a fast response and robust control (insensitive to plant parameter variations) of the load voltage in the presence of load/line disturbances. Analysis and design of the proposed power supply system is presented and digital simulations are carried out which demonstrate the excellent dynamic performance of the power supply