Self-Correction and Dead-Beat Current Control Strategy for Digital Programmed Boost Converter

Abstract

Boost converters are widely used for photovoltaic power generation, energy storage and electric vehicles. Dead-beat current control strategy, one of the most attractive digital current control strategies, enables the inductor current to reach the current reference in a minimal finite number of sampling cycles among digital current control strategies. However, steady state error and dynamic performance compromise will be introduced due to parameter mismatches. In this paper, based on a quantitative analysis for parameter mismatches’ influence on steady state error and dynamic response, a self-correction and dead-beat current control algorithm is proposed to achieve both fast dynamic response and zero steady state error. The steady state error is eliminated by identifying system parameters with a least squares algorithm with forgetting factor. The dynamic response is fast with dead-beat control, enabling the inductor current to reach the current reference in quite few sampling cycles. The above two advantages of the proposed control algorithm is verified by experimental results with a 450 V - 7.0 kW prototype.