Optimal Control of Three-Phase PWM Inverter for UPS Systems

J. W. Jung, M. Dai, A. Keyhani
Ohio State Univ., Columbus, OH, USA ;

This paper appeares in : 35th Annual IEEE Power Electronics Specialists Conference (PESC'04)
Date: June 20-24, 2004
Location: Aachen Germany

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Abstract:
This paper presents a new digital control strategy of a three-phase PWM inverter for Uninterruptible Power Supplies (UPS) systems. To achieve a fast transient response, a good voltage regulation, nearly zero steady state inverter output voltage error, and low total harmonic distortion (THD), the proposed control method consists of two discrete-time feedback controllers: a discrete-time optimal + sliding-mode voltage controller in outer loop and a discrete-time optimal current controller in inner loop. To prove the effectiveness of the proposed technique, various simulation results using Matlab/Simulink are shown under both linear and nonlinear loads.