EFFECT OF DISTRIBUTED GENERATION ON DISTRIBUTION SYSTEM PERFORMANCE

Abstract

These days the technology employed for power generation, transmission and utilization in a power system is changing continuously from day to day. Similarly the load demand in the distribution system also varies continuously from time to time.•Many new technologies have been employed to meet all the requirements of the distribution system quantities like voltage profile, distribution power loss etc. One of the emerging new technologies is generation of power within the distribution system. This is termed as "Distributed Generation" (DG), Even though distributed generation helps in improving voltage profile and reduction in distribution losses, it may affect some of the distribution system quantities such as distribution protection scheme, power quality etc. In this work, the effect of DG on distribution system voltage prof]-., power loss and distribution protection scheme has been considered. Flacement of DG also plays a vital role in affecting distribution power loss and voltage profile. For this purpose, a sensitivity analysis method has been used for DG location based on the power loss sensitivity obtained from the sensitivity analysis. Distribution Load Flow (DLF) plays an important role in analyzing the behavior of the distribution system. In this work, a DLF has been developed for the distribution system with distributed generation. To incorporate the DG into the DLF, the DG has to be modeled as "P-V" or "P-Q" source. In this work, Wind Turbine Generating Units (WTGU) employing Induction Generators for power generation has been considered as DG and modeled as "P=Q" source. As a part of thesis work, a new DLF has been developed with input parameters being intervals instead of crisp values, termed as "Interval Distribution Load Flow" (IDLF). This IDLF is helpful during Power System- Planning. This IDLF has been developed to incorporate the variation in distribution line parameters, load demand and power generated by DG. The solution obtained from the IDLF gives the lower and upper limits for the distribution system quantities (like voltage, power loss). The accuracy of the solutions depends upon the number of input interval quantities and size of the input intervals. In this work, a multi state interval analysis is used so as to improve the accuracy of the solution obtained from IDLF for large size input intervals and is verified with the results obt