A novel instantaneous power control strategy and analytic model for integrated rectifier/inverter systems

This paper is concerned with the design and implementation of an integrated pulse width modulation (PWM) rectifier/inverter for three-phase induction motor drives. Two identical PWM converters are used to serve as power regul ator with unity power factor and servo motor drive using field-oriented con trol, respectively. A new input-output instantaneous power balancing approa ch is proposed to improve the dynamic response of input power regulation du ring output load change in order to minimize the de-link capacitance. By us ing the synchronous rotating-frame current regulators, both the input and o utput currents of the integrated system are characterized with fast current response and low harmonic distortion. The effects of the dynamic response using different input power control methods are compared and the systematic design and analysis of the proposed method are also presented, Theoretical results of the analysis are verified experimentally.