Optimized Phase-Shift Control Method Based on Load Current Feedforward for Bidirectional Full Bridge DC-DC Converters

Abstract

In all-DC offshore wind farms, DC transformer is as an essential part of energy collection, as well as transformation and transmission. However, the intermittency of wind energy could not be avoided, which makes the transmission power of the system unstable, so an excellent dynamic performance for DC transformer is extremely important. This paper proposes an optimal phase-shift control method based on current feedforward to enhance the dynamic characteristic. By leading the load current in a certain proportion into the calculation of the optimal phase-shift, the phase-shift of the converter is recalculated immediately when the load suddenly changes, so as to achieve faster dynamic response speed. At last, based on the MATLAB / Simulink simulation software, the proposed method is verified by a series of experimental results. The effectiveness of the method is verified by simulation analysis.