UPS Systems using Multi-functional Inverters

This paper proposes a high performance multi-functional inverter and its several applications for UPS systems. High frequency PWM voltage source inverter using high speed switching devices such as BIMOS are adopted as the multi-functional inverter. The inverter has current minor control loop and functions as a sinusoidal wave voltage source, an active harmonic suppressor and a high power factor charger with sinusoidal wave input current. Dead beat control (finite-time settling control) is successfully adopted as the current and voltage control of this inverter. The inverter has quick response characteristics and can operate at plural output frequencies such as 50, 60 and 400 Hz. The combination of the multi-functional inverters and high speed electronic switches realizes several new types of redundant UPS system with minimum number of converters.