Increased distributed generation (DG) in systems always brings about the impacts on maintaining the operation of protection systems. This paper concentrates on the impact on the protection reach reduction and proposes a solution to eliminate this impact by using a suitable DG transformer in parallel with a grounding reactance at the neutral point of the transformer's winding. Based on this, a Tabu search algorithm is proposed to maximize DG when the system operating limits and the protection reach reduction are considered as constraints. In order to illustrate the effectiveness of this algorithm, a case study is performed through an IEEE 34 Node Test Feeder. connection. Section 3 analyzse this issue, and then an appropriate connection type is proposed. After analyzing impacts of DG on the reach of relay in Section 4, a practical and robust algorithm for maximizing DG is developed in Section 5 using a sensitivitybased method. This method gradually increases the size of DG until the constraints of system operating limits and protection reach reduction are reached. To extend the method to several DG systems, the multivariable optimization problem is developed by using the Tabu search algorithm, which is presented in Section 6. Then, these two algorithms are applied to an IEEE 34 Node Test Feeder in Section 7.Dao Van Tu (Student member) received the Engineer degree and master's degree in power systems from Ha Noi
Protection schemes of distribution system are designed conventionally for radial feeder structure with one source supplying. The presence of distributed generation as the second source causes the protection schemes to be confused in operations. This paper evaluates the reach of protective relays after distributed generation has been installed into the system. All types of faults are analyzed with the consideration of system grounding methods and connection transformer which connects distributed generation to power system. Then, an approach is proposed to maintain the protected areas of protective devices.
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