New Three-phase Inverter with Dual-Loop Compensator

This paper proposes a new three-phase inverter [11] for voltage generation. The control of the proposed inverter is based on circuit-level decoupling instead of d/q conversion; it is implemented by appropriate rotary logic circuitry in combination with control-core and dual-loop feedback compensator. Control-core can be implemented by One-Cycle Controller (OCC) and Pulse-Width Modulation (PWM) controller. Dual-loop feedback compensator is implemented with switching component of Ic as feedback variable. Superior performance such as low THD, fast dynamic response, as well as low switching loss has been demonstrated. Yet the implementation is simple and flexible. The proposed concept is supported by simulation and experimental results from a 1kW prototype. The prototype is tested under all loading conditions, i.e. no load, full load and non-linear load. With OCC control-core, it has the strength of full rejection of input voltage perturbations as well as the ability to track abrupt reference change. With dual-loop compensator, it can achieve satisfactory output voltage regulation at low switching frequency.