Decentralized and Coordinated Vf Control for Islanded Microgrids Considering DER Inadequacy and Demand Control

TL;DR

This paper introduces a decentralized control framework for islanded microgrids that optimally manages limited DER capacity and load sensitivity to improve voltage and frequency stability.

Contribution

It proposes a novel decentralized and coordinated Vf control method considering DER inadequacy and load dependence, with rigorous stability analysis and simulation validation.

Findings

Enhanced DER capacity utilization

Improved voltage and frequency stability

Reduced involuntary load shedding

Abstract

This paper proposes a decentralized and coordinated voltage and frequency (Vf) control framework for islanded microgrids, with full consideration of the limited capacity of distributed energy resources (DERs) and Vf dependent load. First, the concept of DER inadequacy is illustrated with the challenges it poses. Then, a decentralized and coordinated control framework is proposed to regulate the output of inverter based generations and reallocate limited DER capacity for Vf control. The control framework is composed of a power regulator and a Vf regulator, which generates the supplementary signals for the primary controller. The power regulator regulates the output of grid forming inverters according to the real time capacity constraints of DERs, while the Vf regulator improves the Vf deviation by leveraging the load sensitivity to Vf. Next, the static feasibility and small signal stability of the proposed method are rigorously proven through mathematical formulation and eigenvalue analysis. Finally, a MATLAB Simulink simulation demonstrates the functionalities of the control framework. A few goals are fulfilled within the decentralized and coordinated framework, such as making the best use of limited DERs capacity, enhancing the DC side stability of inverter based generations, and reducing involuntary load shedding.