Reliability-oriented Current Sharing and Voltage Balancing in DC Microgrids: An LPV-based Approach

This paper proposes a reliability-aware secondary control scheme for power-electronics-dominated DC microgrids with an additional goal of enhancing the microgrid's reliability. The main goal of the paper is to enforce components' reliability, modeled as time-varying parameters, into a reliability-oriented power sharing and voltage balancing. To this end, a DC microgrid under the degradation process of power converters' parameters is modeled by a linear parameter varying (LPV) system. By virtue of this novel description and leveraging tools from stability analysis and control synthesis of LPV systems, as well as insights from the physics of microgrids, the paper de-velops a novel reliability-oriented distributed secondary control scheme. The proposed scheme does not rely on the topology of microgrids nor the parameters of power lines; it guarantees stability, voltage balancing, and current sharing while taking the reliability aspects and stability constraints into the control design process. Simulation results verify the performance and effectiveness of the proposed secondary control approach.