Abstract
The necessity for the utilization of microgrids emerges from the integration of distributed energy resources, electric vehicles, and battery storage systems into the conventional grid structure. In order to achieve a proper operation of the microgrid, the presence of a microgrid control system is crucial. The IEEE 2030.7 standard defines the microgrid control system as a key element of the microgrid that regulates every aspect of it at the point-of-interconnection with the distribution system, and autonomously manages operations such as the transitions of operating modes. In this paper, a microgrid control system is developed to achieve real-time monitoring and control through a centralized approach. The controller consists of a centralized server and advanced field units that are also developed during this work. The control functions of the centralized server ensure the proper operation during grid-connected and island modes, using the real-time data received via the advanced field unit. The developed server and the field unit constitute a complete system solution. The server is composed of control function and communication, database, and user interface modules. The microgrid control functions comprise dispatch and transition core-level functions. A rule-based core-level dispatch function guarantees the security of supply to critical loads during the islanded mode. The core-level transition function accomplishes a successful transition between the operation modes. Moreover, a communication framework and a graphical user interface are implemented. The presented system is tested through thecases based on the IEEE 2030.8 standard.
Highlights
Microgrids (MG) can be defined as distributed power systems that operate either in grid-connected or island mode [1]
The field data is acquired by MG control and communication device (MCCD) from the field and transmitted to the controller multi-thread server (CMTS), where this information is processed and consequent commands are executed
The MCCD can implement the commands from the CMTS
Summary
Microgrids (MG) can be defined as distributed power systems that operate either in grid-connected or island mode [1]. It should be noted that there are load management approaches in other studies; those are not in compliance with the specifications of IEEE standards for core-level functions These control functions make the proposed MGCS flexible for different MGs regardless of an MG’s size and application. The presented central MG control system is examined through the test cases based on the IEEE 2030.8 standard [22] and the results in the third section This standard addresses the functions higher than the component control level related to the proper operation of the MG energy management system common to all MGs, regardless of the application, topology, configuration, or administration. Regarding controllability, loads can be divided into two groups: discretely controlled loads (DCL) and continuously controlled loads (CCL)
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