MAS-based solution to energy management strategy of distributed generation system

• A MAS based decentralized coordinated control scheme for DGS is constructed.
• The multi-mode behaviors of the DER units are modeled by using PN.
• The voltage stability assessment index is studied.
• The coordinated control commands in upper level agent are designed.
• The hybrid controls including switching control strategies and continuous controller are designed in unit agent.

This paper focuses on the energy management issue of a Distributed Generation System (DGS) for ensuring energy supply with high security. Firstly, considering that the DGS is composed of many types of Distributed Energy Resources (DERs) and a group of loads, a Multi-Agents System (MAS) based two hierarchical decentralized coordinated control scheme is constructed to deal with the complex energy management problem of the DGS, and JADE platform is applied to implement the MAS based energy management strategies. Then, the mode switching behaviors of each DER or load unit are described based on Petri Net (PN) models. And a Voltage Security Assessment (VSA) L-index is constructed. According to the L-index, four different operating modes of the DGS are determined and the coordinated control commands in the upper level agent are drafted. Based on PN models, according to the coordinated control commands, the switching control strategies are designed in the lower level respective unit agent to ensure secure energy supply against variable operating conditions. Moreover, the decentralized continuous controller in the lower level unit agent is also presented to dynamically regulate the output performance. Finally, the validity of proposed control scheme is demonstrated by means of simulation results.