An Improved Analytical Method For Optimal Sizing And Placement Of Power Electronic Based Distributed Generation Considering Harmonic Limits

The progress in technology to integrate renewable energy sources to the grid and the concern for the environment has led to the proliferation of power electronic based distributed generation (PEB-DG) in the distribution system. The presence of PEB-DG in the distribution system offers numerous benefits such as the reduction in power loss, improvement of voltage profile and power quality. However, the increased penetration of PEB-DG may result in increased harmonics content which could exceed the IEEE 519-2014 standard for harmonic limits. This work presents an improved analytical algorithm for optimal sizing and placement of PEB-DG on the standard IEEE 69 with background harmonics. The active power loss in the network before the PEB- DG allocation was 244kW. The application of the proposed method obtained an optimal PEB-DG size of 1387 kW at bus 61 of the network. Therefore, the active power loss was reduced to 103 kW indicating a 57.8% reduction. There was also significant improvement in the bus voltage profile and the total harmonic voltage distortion of the network was within the acceptable limit.