Managing the impact of intermittent generation on power system operation

Abstract

This paper discusses the implications of the intermittency of wind and solar generation on power system operation and conventional generation. The analysis is based on modelling using actual half hour demand and wind generation output records extrapolated by zone to maintain the effect of diversity. It discusses and quantifies: The need to curtail renewable generation output at times of light load to meet system operation requirements to retain reserve and accommodate inflexible; The capacity contribution that can be credited to renewable sources towards meeting peak demands assessed on a probability basis; The impact on the operating costs and emissions from conventional generation in operating less efficiently at part load balancing renewable generation output. The impact on the utilisation and financial viability of marginal generation; The evaluation of alternative methods for balancing intermittent renewable generation output including using interconnection to access remote hydro and comparing the use of gas turbines with storage systems; The implications to the transmission system costs and losses associated with remote renewable installations with limited utilisation; The optimal generation mix and the scope for a proportion of generation with Carbon Capture and Storage (CCS) based on an LP formulation. The analysis is based on recent consultancy projects undertaken for government agencies.