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Author: search.filters.author.Polmai, SompobSubject: search.filters.subject.Microgrid

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    Multi-agent system based real-time control for standalone microgrid
    (2017-11-28)
    Leng, Darith
    ;
    Soontorntaweesub, Kittichot
    ;
    Polmai, Sompob
    The energy crisis and environmental concern lead to widely use of renewable energy sources in form of microgrid. The intermittent nature of the microgrid's sources and the altering behaviors of loads result to unstable of the system's voltage and frequency as well as the system reliability. The purpose of this paper is to develop real-time control based decentralizing technique for handling the challenging issues of the microgrid. Two levels distributed control is proposed. A modify droop control and frequency restoration is implemented as low-level control. The upperlevel, a multiagent system is developed and it is the main control method in the research. The agents are implemented using Boris based on C#.NET language. The multiagent system consists of four main agents such as CONTROL agent, DER Agent, RENEW agent and LOAD agent. To evaluate the control performance, the microgrid testbed has been built. The results prove the effectiveness of real-time control to stabilize, monitor, improve system reliability and provide the microgrid intelligent operation.
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    Experiment on distributed cooperative control with multi-agent system for a single-phase microgrid
    (2015-08-17)
    Leng, Darith
    ;
    Polmai, Sompob
    In a microgrid, electric generation is based on combination of small generators and renewable resources such as solar and wind. The operating conditions of the microgrid are dynamically altered by both the load and the intermittent nature of the renewable resources. To maintain the voltage and frequency stability of such microgrid, this paper presents distributed cooperative control of a microgrid using multi-agent system. The multi-agent system is implemented by using Mobile-C based on Client-Server architecture, and Ch and Embedded Ch as the agents run time. Serial communication is implemented for data exchange between agents and microgrid elements. To validate the effectiveness of the proposed control system, two scenarios have been experimented. The experimental results demonstrate the generator connecting/disconnecting and load shedding ability of the microgrid.
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    Experiment on fault current limiting by a single-phase bridge type fault current limiter with DC and AC reactors
    (2010-12-01)
    Sujjapan, Noppadol
    ;
    Polmai, Sompob
    This paper presents description of configuration and operation principle of a solid-state bridge-type SSFCL with DC and AC reactors. In this configuration the short-circuit limitation takes effect immediately after the fault by DC and AC reactor. The DC reactor is separated from the fault circuit after a half cycle period leaving only AC reactor for steady-state current limitation. This SSFCL is planned for used in microgrid for reliability enhancement and improve power quality at the point of common coupling. The laboratory-scale single phase model of a SSFCL is built for evaluation and validation. The experimental results are compared with the simulation result for confirmation.