Abstract
Data acquisition and supervisory control are usually performed using client-server architecture and centralized control in conventional power systems. However, the message transmission and fault clearing are too slow for large-scale complex power systems. Microgrid systems have various types of distributed energy resources (DERs) which are quite different in characteristics and capacities, thus, the client-server architecture and centralized control are inadequate to control and operate in microgrids. Based on MATLAB/Simulink (ver.R2012a) simulation software and Java Agent Development Framework (JADE) (JADE 4.1.1-revision 6532), this paper proposes a novel fault protection technology that used multi-agent system (MAS) to perform fault detection, fault isolation and service restoration in microgrids. A new topology identification method using the YBus Matrix Algorithm is presented to successfully recognize the network configurations. The identification technology can respond to microgrid variations. Furthermore, the interactive communications among intelligent electronic devices (IEDs), circuit breakers (CBs), and agents are clarified during fault occurrence. The simulation results show that the proposed MAS-based microgrids can promptly isolate faults and protect the system against faults in real time.
Highlights
This work builds on a recent conference paper [1] concerning fault protection coordination in microgrids
The main contributions of the current paper are that a new Topology Identification Matrix method was developed for a microgrid system with a dynamic network and a multi-agent system (MAS) protection coordination strategy was used for fault protection
The feasibility and effectiveness of the proposed multi-agent technology applied on microgrid for protection coordination were simulated and verified by the
Summary
This work builds on a recent conference paper [1] concerning fault protection coordination in microgrids. Compared with the conference paper, a new topology identification method and some performed study cases are presented in this paper. The conventional centralized control is inadequate for microgrid systems [7–9]. To solve this problem, a novel multi-agent system (MAS) based on topology identification method is proposed in this paper. A new Topology Identification Matrix method applied in a multi-agent-based microgrid system is proposed to perform MAS protection coordination. The main contributions of the current paper are that a new Topology Identification Matrix method was developed for a microgrid system with a dynamic network and a MAS protection coordination strategy was used for fault protection. The proposed approach is verified for the case of symmetrical faults of a radial distribution system
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