M.A. Thesis:

Designing a coordinated control system and sharing reactive power in island microgrids to control voltage and frequency

Abstract: The purpose of this thesis is to design a coordinated control system and share reactive power in island microgrids to control voltage and frequency. One of the most important and basic issues of microgrids, in the state of separation from the power grid, is the control of frequency and voltage. With the increasing consumption of electricity in the world, the electricity industry is facing issues such as the high cost of building new power plants and the development of transmission, over-distribution and distribution networks, water and environmental concerns. In order to overcome these problems, increase the reliability of customer service and reduce congestion and losses in transmission and distribution lines, distributed and renewable energy sources are new and suitable options that have been introduced in the last two decades. ¬اند. In this research, a comprehensive management and control structure for a hybrid microgrid is proposed. Due to its multilevel structure and interaction with different parts of the microgrid, this system provides effective cooperation between distributed controlled products and renewable energy-based products; And with proper management, it uses the potentials and potential benefits of each equipment to meet the challenges of microgrids and maintain voltage and frequency in the range of nominal values. This interactive structure, on the one hand, greatly increases the reaction rate of the microgrid and prevents voltage and frequency deviation, and on the other hand, allows the use of distributed renewable energy-based generation sources in the microgrid. The proposed control system has been implemented by MATLAB / Simulink software on a hybrid microgrid with two parts AC and DC, implemented in the presence of distributed products based on renewable energy, and evaluated in various disturbances. Keywords: coordinated control; Microgrid; Frequency and voltage control; Scattered production sources; Renewable energy

Keywords: Keywords: coordinated control; Microgrid; Frequency and voltage control; Scattered production source