Impact Analysis of Integrating Wind Power with National Grid of Nepal

Abstract

The electrical grid has great impact of integrating wind energy. Wind power penetration levels of 20 MW (2.75%), 50 MW (6.88%), 100 MW (13.76%) and 150 MW (20.64%) were considered. The power generation data from Nepal Electricity Authority (NEA) along with wind power production at Kagbeni data were used to analyze the impacts of wind integration. Further, a statistical summary of the changes in the regulation and load following time frames was conducted. The statistical results demonstrated that the impact of wind power upon regulation is very small. For wind input in the NEA generation system using geographical aggregation as 12 MW from Kagbeni and 8 MW from Pyuthan showed that variability was reduced up to some extent than taking power from only one site Kagbeni. Load following results demonstrated that the standard deviation of hourly generation changes showed little change for 20 MW of wind power and increased only modestly for up to 150 MW of wind power. The relatively modest increase in the standard deviation, even at 150 MW, is indicative of the substantial amount of variability already managed by NEA and suggests that absent the physical generation resources available are sufficient to handle wind variability.