Compensation Control for Line Impedance Detection in Interconnected DC Microgrids Based on Periodic Single-Pulse Detection Method

Within the conventional droop control framework of interconnected DC microgrid systems, line resistance adversely affects the precision of power distribution during power sharing and the bus voltage, resulting in diminished control effectiveness. This paper introduces an impedance detection and compensation control method applied from the microgrid to the common DC bus. Building upon traditional droop control, it incorporates small pulses and analyzes the voltage and current signals feedback from the microgrid. Through a periodic resistance compensation strategy, it dynamically updates the line resistance values, effectively enhancing the accuracy of power distribution within the microgrid and the voltage level of the common DC bus.

I. INTRODUCTION

In the context of "carbon neutrality" and "peak carbon," new energy sources are gradually displacing traditional ones [1]. It is imperative to construct a new type of distribution network on the distribution side, primarily based on distributed renewable energy generation [2]-[3]. Microgrids represent an effective means of distributed generation in the distribution network [4]. However, individual microgrids face challenges such as insufficient capacity for accommodating new energy and inadequate system inertia. To address these issues, the approach of interconnecting multiple microgrids through a common bus has been adopted [5].