Implementation of load sharing with fast voltage regulation in parallel connected cascaded power boost converters based on droop coefficients refreshing method

Abstract

Droop control has been widely implemented in Parallel structures of DC DC converters due to its inherent modularity and ease of implementation. In this kind of converters with resistive distribution lines, the P-V droop with boost converters is the most common method for load sharing. Current or load sharing is the most critical parameter in parallel operation of converters. Most of the methods to guarantee equal load sharing utilize some form of communication between the units. This increases the complexity and sensitivity to noise. The method that has been considered in this paper is P-V control option. P-V droop controls the dc current depending on the dc voltage. In this technique, per 10 microseconds, droop coefficients will be refreshing by sampling by load current. This circuit is simulated by MATLAB/SIMULINK and CADENCE for preparing to instruction and the results of the simulation confirmed the theoretical design. This design has implemented on a parallel structure with two blocks of cascaded boost converters at laboratory scales.