Robust self-consistent control of PV-battery-based microgrids without continuous communication

• Published in: International journal of electrical power & energy systems 2020-07, Vol.119, p.105900, Article 105900
• Main Authors: Lai, Jingang, Lu, Xiaoqing
• Format: Article
• Language: English
• Subjects: Ac microgrid; Event-triggered communication; Robust distributed cooperative control; Self-consistent power sharing
• ISSN: 0142-0615; 1879-3517
• DOI: 10.1016/j.ijepes.2020.105900

•A robust distributed control is proposed for self-consistent proportional power sharing.•A two-layer multi-agent framework is proposed through a sparse communication network.•The communication network is subject to time delays and limited-bandwidth constraints.•The sufficient conditions on the delay boundedness considering limited-bandwidth constraint are obtained.•The proposed control protocols are implemented in a fully distributed way. This paper presents a robust two-layer distributed control scheme to regulate the power output of massive distributed energy resources (DERs) (e.g., photovoltaics (PVs) and battery energy storage systems (BESSs)) in an islanded ac microgird, which can achieve the self-consistent proportional power sharing across the whole microgird system with time delay merely through limited noncontinuous communication among DERs based on their status and capacities. By employing delay-based event-triggered communication, the proposed control scheme only relies on limited aperiodic communication, which can greatly reduces the communication cost in the cyber network, moreover is also robust to time delays. Furthermore, the proposed control scheme is fully distributed, thus each DER only requires the local voltage and current measurement from its own and some neighbors for the distributed power sharing control at the last event-triggered time instant to achieve self-consistent active and reactive power outputs. The inequality technique is employed to devise the stability and convergence analysis of the proposed dynamic event-triggered conditions. The effectiveness of the proposed control strategy is verified under various scenarios obtained from OPAL-RT simulator by a modified IEEE 34-bus test network in MATLAB/SimPowerSystems.