Voltage and Power Imbalance Mitigation in Bipolar DC Microgrids

نوع: Type: thesis

مقطع: Segment: masters

عنوان: Title: Voltage and Power Imbalance Mitigation in Bipolar DC Microgrids

ارائه دهنده: Provider: Mohammad Ali Jahangirian

اساتید راهنما: Supervisors: Mohamad Amin Ghasemi

اساتید مشاور: Advisory Professors:

اساتید ممتحن یا داور: Examining professors or referees: Mohammad Hassan Moradi & Alireza Hatami

زمان و تاریخ ارائه: Time and date of presentation: Wednesday 1400/09/24 - 16:00 pm

مکان ارائه: Place of presentation: Online

چکیده: Abstract: Microgrids as a platform for increasing the use of distributed energy sources has been proposed as an alternative to traditional power grids. The microgrid consists of a number of distributed generation units such as wind turbines, photovoltaic systems, diesel generators, and fuel cells that can supply loads in grid-connected or island modes. Despite the numerous benefits of Microgrids, various technical challenges appear in their operation and control. Microgrids are generally divided into two types of AC and DC microgrids, among which DC microgrids lead to better efficiency and effectiveness. Bipolar DC microgrids are a new concept that has been proposed which is, in fact, an imitation of AC three-phase networks. With the help of bipolar DC microgrids, it will be possible to connect sources and loads with three different voltage levels, and at the same time, the required conductors of the network will be reduced. Despite the various benefits of using bipolar DC microgrids, the problem of voltage and power imbalance is one of the technical issues in the operation of these microgrids, which is the subject of this dissertation. In this dissertation, the details and concept of a microgrid are discussed with emphasis on bipolar DC microgrid, and its different parts are studied. Then, the problem of voltage and power imbalance in these microgrids is modeled and the need to eliminate this imbalance is explained. Then, by analyzing the proposed solution so far for this problem, the use of Buck-Boost voltage balancing converter has been selected as the main actuator and by applying the combined integral and sate feedback controllers, the power and voltage imbalance has been eliminated. Finally, the efficiency and functionality of the proposed control mechanism are examined through simulation of a sample Microgrid under different operating conditions

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