A Simplified Approach to Assess the Security of Power Systems Containing Wind Electric Generation

摘要

Globally, wind has become the fastest growing renewable energy resource for electric power generation. Competitive generation costs and advancing turbine technology coupled with the use of variable speed option and power electronics are some of the reasons for this impressive growth. Turbines are getting larger and more efficient at a rapid rate. Megawatt-scale units (1.5 to 2 MW) are becoming the standard and several larger (up to 5 MW) units are in various stages of development. Due to the inherent variability of the resource, the question of how the overall security of a power system wilt be affected by the insertion of wind generation need to be studied. Obviously, the nature and extent of the influence will depend on several factors such as wind regime, turbine design, level of penetration, time dependence of load, etc. A simplified approach based on "security index" is considered in this paper. The standard (24 bus) reliability test system is used in the study. Results are presented in the form of probability distribution functions (pdf) for the security index obtained using the PDF of wind speed distributions and output characteristics of wind generation systems. Influences of scale and shape parameters of the wind speed distribution are considered in detail Based on the simulation results, some conclusions are drawn about the influence of wind electric generators and wind regimes on the security of a power system.