Research And Design Of 9KVA Three-phase Combined Inverter

With the development of the electronic technology, the higher requirements of Power Supply are raised including high efficiency , high power density , low EMI and rapid dynamic response. A Hysteresis-band instantaneous current control PWM technique is popularly used because of its simplicity of implementation, fast current control response, and inherent peak current 1 imiting capability. In this thesis a novel 9KVA three-phase combined inverter, designed with this technique, is introduced. This inverter is made up of three independent single-phase inverters. Each inverter can work separately. The analysis shows that it has good performance even with unsymmetrical load.This paper mainly describes the circuit scheme, operation principle, parameter design of this three-lever hysteresis current controlled inveter and analyses the stiffness and stability of the system .