New Three-phase Inverter for UPS application

This paper proposes a new three-phase inverter for UPS application. The control of the proposed inverter is based on circuit-level decoupling (Salmon, 1996 and Qiao and Smedley, 1999) instead of d/q conversion; it´s implemented by appropriate logic circuitry in combination with a control-core and a PID compensator. The control-core can be implemented by one-cycle controller (OCC), pulse-width modulation (PWM) controller, hysteresis controller and current-programmed mode (CPM) controller, etc. Superior performance such as low THD, fast dynamic response, as well as low switching loss has been demonstrated. The proposed concept is supported by simulation and experimental results from 1kW prototypes built and tested under all loading conditions i.e. zero load, full load and non-linear load. With OCC control-core, it has the added strength of full rejection of input voltage perturbations as well as the ability to track abrupt reference change