Distributed frequency restoration and SoC balancing control for AC microgrids. (March 2022)

• Record Type: Journal Article
• Authors: Yu, Chang; Lu, Xiaoqing; Lai, Jingang; Chai, Li
• Is Part Of: International journal of electrical power & energy systems. Volume 136(2022)
• Publication Date: 2022-03
• Subjects: Frequency restoration -- SoC balancing -- Finite-time control -- Event-triggered -- Multi-agent systems; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2021.107557
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: The frequency restoration and SoC balancing problems can be solved simultaneously. A finite-time controller is designed to solve the above two problems in fixed time. Each DER or BESS only needs to update its own control input at event times. The event time is proved to be greater than 0 so that the Zeno behavior is avoided. Abstract: This paper develops an improved distributed finite-time control algorithm for multiagent-based ac microgrids with battery energy storage systems (BESSs) utilizing a low-width communication network. The proposed control algorithm can simultaneously coordinate BESSs to eliminate any deviation from the nominal frequency as well as solving state of charge (SoC) balancing problem. The stability of the proposed control algorithm is established using Lyapunov method and homogeneous approximation theory, which guarantees an accelerated convergence within a settling time that does not dependent on initial conditions. Based on this, to significantly reduce the communication burdens, an event-triggered communication mechanism is designed which can also avoid Zeno behavior. Then sufficient conditions on the event-triggered boundary are derived to guarantee the stability and reliability of the whole systems. Practical local constraints are imposed to implement the control protocol, and the theoretical results are applied to a test system consisting of five DGs and five BESSs, which verifies the effectiveness of the proposed strategy.