Power
Ali Morsagh Dezfuli; Mahyar Abasi; Mohammad Esmaeil Hasanzadeh; Mahmood Joorabian
Abstract
The utilization of distributed generation (DG) in today's power systems has led to the emergence of the concept of microgrids, in addition to changing the mode of generating and supplying the energy required for network electrical loads. When a microgrid operates in the island mode, energy generation ...
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The utilization of distributed generation (DG) in today's power systems has led to the emergence of the concept of microgrids, in addition to changing the mode of generating and supplying the energy required for network electrical loads. When a microgrid operates in the island mode, energy generation sources are responsible for controlling the microgrid’s voltage and frequency. As the microgrid frequency is proportional to the amount of power generated by the DG, the microgrid requires a precise power-sharing strategy. Considering that DGs do not usually have stable output power despite the importance of power stability, the present paper addresses the voltage and frequency control of an islanded microgrid by considering the power generation uncertainties caused by disturbances and the varying power output of DGs. Given that the disturbance on the first DG's input current is 0.2 A, which is approximately 2.2% of the steady-state value, a simulation was performed, and it was observed that the maximum voltage variation of each bus in the worst case was 0.59% for the first bus and 0.53% for the second bus, which means that the controller could control the voltage and frequency values within the permissible range. If the controller is not used, the change in the frequency of each bus will be 10 times, and the voltage change will be 5 times as great as that of the case the controller is used.
Power
Mahyar Tofighi-Milani; Sajjad Fattaheian-Dehkordi; Mahmud Fotuhi-Firuzabad
Abstract
Microgrids, which have newly been included in power systems, have facilitated the management of distributed generations. In this context, the privatization of power systems, as well as flexible sources like electrical vehicles and storage systems, has been enhanced significantly by the advent of microgrids. ...
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Microgrids, which have newly been included in power systems, have facilitated the management of distributed generations. In this context, the privatization of power systems, as well as flexible sources like electrical vehicles and storage systems, has been enhanced significantly by the advent of microgrids. In a microgrid structure, the microgrid’s operator coordinates the agents and ensures the reliability of the network, while the agents manage their local resources independently. Nonetheless, new management methods should be implemented into the multi-agent-structured microgrids to meet their distributed nature. This paper proposes a new peer-to-peer energy market to optimize the operation of a multi-agent microgrid run in the isolated mode. The designed framework facilitates power trading between the system agents and addresses the privacy issues of the network consumers or producers. The proposed scheme is finally simulated on a 15-bus multi-agent-structured microgrid to study its effect on microgrid management in the isolated mode.