Centralized Microgrid Control System in Compliance with IEEE 2030.7 Standard Based on an Advanced Field Unit

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

SIW oyukla arkalandırılmış anten ve Fabry-Pêrot anten ile doğrultucu antenlerin geliştirilmesi.

A rectenna is a term that is used for an antenna that is integrated with a microwave rectifier for the purpose of capturing microwave power and converting it to DC power. Rectennas are mostly employed for wireless power transmission via microwaves. In this thesis work a substrate integrated waveguide cavity backed (SIWCB) slot antenna and a Fabry-Pérot antenna is designed, manufactured and tested to be used as the receiving antenna of a rectenna system along with a microwave rectifier to be used as the rectifying part of this system. All system is designed to operate at 2.45 GHz. Microwave rectifier is designed to have a 56% RF to DC conversion efficiency. Microwave rectifier is realized by distributed elements and a microwave diode with using harmonic balance simulation. SIWCB slot antenna is selected in this design for its low profile, easy integration with microwave elements, low cost, ease of fabrication and high efficiency. Designed SIWCB slot antenna has microstrip to grounded coplanar waveguide transformation for its feeding. Designed antenna has a gain of 2.9 dBi and 10 dB bandwidth of 20 MHz. Fabry-Perot antenna is designed using a two layered frequency selective structure (FSS) of subwavelength units. This designed FSS is used for the formation of the Fabry-Pérot cavity. In this thesis work Fabry-Perot antenna is preferred for its high gain, low cost and ease of fabrication. A simple patch antenna is used as the primary radiating element. Designed Fabry- Pérot antenna exhibits a gain of 10.5 dBi with 10 dB bandwidth of 26 MHz. These developed elements are used for formation of a rectenna system whose power transmission efficiency is also measured in the laboratory environment. All simulation results are in good agreement with measured values for microwave rectifier, SIWCB slot antenna, FSS Fabry-Pérot antenna and rectenna system.M.S. - Master of Scienc