Stabilizing distribution network during peak load by means of distributed generations (case study: Nowshahr City located in Mazandaran-Iran)

摘要

Electricity production during peak load compared to off-peak imposes additional cost to the ministry of power whereas power loss reaches to its maximum. In recent years one of the main problems in Iran's distribution network has been excessive voltage drop in some of its 20 KV feeders during peak load so that the distribution company has to apply interruptions to some costumers. In this paper in order to solve the mentioned problem, distributed generation (DG) with optimum size and location using intelligent algorithms is introduced. Stability of Nowshahr city's feeders located in Mazandaran province-Iran, due to its connection to the seaport and city's tourist, is of great importance. Localization and sizing of DGs are investigated using three scenarios (1, 2, 3 DGs) with regard to the limitations on DGs penetration index. In this paper reliability parameters, SAIFI, SAIDI and ENS are calculated and compared before and after DG installation. In order to have an operational plan, low load and short circuit analysis along with return of investment assuming that all DGs are in form CHP, is carried out.