Optimal integration of solar photovoltaic distributed generation considering reliability index, voltage stability index and loss configuration

Abstract

Climate change and environmental issue is a common concern for all of us. On the other hand, energy is essential for our daily life and how to get secure, affordable and environmental sustainable energy becomes global issue. Distributed generation(DG) is one of the solution to mitigate environmental impact and to integrate as a part of the smart grid. Solar photovoltaic can be used abundantly as the small multi-distributed generation system to improve system performance in many ways. According to the previous researches, it is clear that DG can make system performance better. However, choosing location and sizing is a must considerable issue for integration of DG in the distribution network. In some research, the location and size was determined only depended on the amount of loss reduction. In our research, three factors such as reliability index, voltage stability index and loss reduction are going to evaluate to figure out the location and size of the DGs. Using forward-backward sweep method in MATLAB, power loss condition is analysed. Then, loss reduction level is check by installation DG in each bus and the most effective buses or the buses at which the highest amount of loss DG can reduce are assigned as locations for DG. And then the voltage stability index (VSI) is calculated and one of the nominate buses which has highest VSI index is chosen as the designated bus for allocation. In this way, the optimal location of DG can be assigned with the consideration of losses and VSI index. In another way, the location of DG can be determined with the consideration of reliability index. From the concept of reliability, the most effective or optimal location is the bus at which the reliability is the highest. In this research, the location and size of DGs were considered based on combination of three indices such as VSI, loss and reliability index.