Mitigate the Effect of Distributed Generators Connected to Distribution System

This paper proposes the use of two methods, the first being the conventional method and the second being curve time grading methods to study and mitigate the effect of connecting the distributive generators to the IEEE15 bus distribution system. The main contribution of this work is that they are simple and applicable to all types of medium-sized networks and high speed to obtain results, compared with other methods that require the use of complex programs and require a long time to implement and obtain results. This is achieved through the use of some simple and uncomplicated equations with almost total dependence on ETAP software. ETAP program is used for analyzing and checking the results obtained, where the operating time and TMS value of all relays in the system are calculated in case the distribution generators are not connected, and to ensure the quality of coordination by Etap software, then the distributive generators are connected, their effects are studied, and the relays are coordinated again by the two previous methods. The conventional method applies to all topologies, but it requires accuracy in transferring information and takes a longer time to obtain results compared to the curve time grading method, which in its work depends entirely on the use of star view from Etap curves characteristics, its results are more accurate and can be obtained in less time. The methods mentioned enabled the engineers and technicians in controlling the electrical system connected to distribution generators by obtaining high accuracy results in a very short time.