Distributed Control of Inverter-Based Lossy Microgrids for Power Sharing and Frequency Regulation Under Voltage Constraints

TL;DR

This paper introduces a distributed control framework for inverter-based microgrids that ensures power sharing, frequency synchronization, and voltage constraints are maintained despite uncertainties and contingencies.

Contribution

The paper proposes a novel distributed control approach for lossy microgrids that guarantees stability, power sharing, and voltage regulation under uncertainties and network failures.

Findings

Achieves synchronized inverter frequency and proportional power sharing.

Maintains voltage and angle constraints during disturbances.

Robust under communication failures and component outages.

Abstract

This paper presents a new distributed control framework to coordinate inverter-interfaced distributed energy resources (DERs) in island microgrids. We show that under bounded load uncertainties, the proposed control method can steer the microgrid to a desired steady state with synchronized inverter frequency across the network and proportional sharing of both active and reactive powers among the inverters. We also show that such convergence can be achieved while respecting constraints on voltage magnitude and branch angle differences. The controller is robust under various contingency scenarios, including loss of communication links and failures of DERs. The proposed controller is applicable to lossy mesh microgrids with heterogeneous R/X distribution lines and reasonable parameter variations. Simulations based on various microgrid operation scenarios are also provided to show the effectiveness of the proposed control method.