Enhancement of Distribution Systems Performance Using Microgrids
Reham Ahmed Osama Mohamed Mohamed;
Abstract
This thesis introduces a novel approach for the optimal construction of interconnected microgrids in the distribution level having various distributed energy resources. The IEEE Std.1547.4-2011 recommended that the operation and control of distribution networks can be enhanced by dividing these networks into a number of microgrids. The suggested planning scheme combines the essential requirements for microgrids to function with high efficiency during connection with the larger grid and with high possibility of islands’ success in stand-alone mode of operation.
The optimal partitioning of distribution networks involves finding the locations of cut-set lines that define the microgrids’ borderlines for different objectives. To ensure robustness of design, the partitioning mechanism in this thesis optimizes three objective functions. The first objective involves maximization of microgrids’ self-adequacy. During grid-connected operation, minimizing the imbalance of generation and loads can minimize the energy exchange between the microgrids and increase their self-sufficiency. The second objective involves maximization of the probability of successful islanding of microgrids. If interruption of loads within an islanded microgrids is kept to a minimum, the cost of power outages for utilities and customers can be diminished along with an improvement in the overall system’s security. An indicator is defined which takes into consideration the requirements for a successful operation of an island. The third objective function combines both the first and the second objective simultaneously to attain the maximum possible benefits.
To solve the optimization problem, the population-based backtracking search algorithm is adopted which is an iterative method that was recently proposed to overcome the shortcomings of evolutionary algorithms. The complex computation and the use of many parameters are the major drawbacks of such algorithms. The backtracking search algorithm has a single parameter that controls the search’s amplitude and direction to provide the required balance between exploration and exploitation processes, i.e., local and global search procedures, in order to improve problem solving capability.
The optimal partitioning of distribution networks involves finding the locations of cut-set lines that define the microgrids’ borderlines for different objectives. To ensure robustness of design, the partitioning mechanism in this thesis optimizes three objective functions. The first objective involves maximization of microgrids’ self-adequacy. During grid-connected operation, minimizing the imbalance of generation and loads can minimize the energy exchange between the microgrids and increase their self-sufficiency. The second objective involves maximization of the probability of successful islanding of microgrids. If interruption of loads within an islanded microgrids is kept to a minimum, the cost of power outages for utilities and customers can be diminished along with an improvement in the overall system’s security. An indicator is defined which takes into consideration the requirements for a successful operation of an island. The third objective function combines both the first and the second objective simultaneously to attain the maximum possible benefits.
To solve the optimization problem, the population-based backtracking search algorithm is adopted which is an iterative method that was recently proposed to overcome the shortcomings of evolutionary algorithms. The complex computation and the use of many parameters are the major drawbacks of such algorithms. The backtracking search algorithm has a single parameter that controls the search’s amplitude and direction to provide the required balance between exploration and exploitation processes, i.e., local and global search procedures, in order to improve problem solving capability.
Other data
| Title | Enhancement of Distribution Systems Performance Using Microgrids | Other Titles | تحسين أداء أنظمة التوزيع باستخدام الشبكات المصغره | Authors | Reham Ahmed Osama Mohamed Mohamed | Issue Date | 2020 |
Recommend this item
Similar Items from Core Recommender Database
Items in Ain Shams Scholar are protected by copyright, with all rights reserved, unless otherwise indicated.