Evaluation on available transfer capability of power system considering wind speeds correlation

The output power of wind turbines or wind farms depends on wind speeds, which may have certain correlation in one region or even in different repons. When the wind speeds correlation is ignored, it will have a significant influence on Available Transfer Capability (ATC) of power system with wind farms. This study established a random variables simulation method considering wind speeds correlation to more accurately evaluate ATC. The proposed methods are concerned with rank correlation coefficient, Copula theory and Monte Carlo Simulation (MCS), which are simple and easy to implement. In addition, the evaluation models for ATC were built on based of Optimal Power Flow (OPF) and Fast Voltage Stability Indices (FVSI) was considered as inequality constraints in order to guarantee the voltage stability of system. The modern interior point method was applied to solve the proposed models. Simulations are carried out on IEEE 118-bus system. The results show effectiveness and availability of the proposed method in evaluating on ATC of power system considering wind speeds correlation. The conclusion can provide a technical support for the ATC evaluation and decision-making as well as wind power forecast. © 2015 Academic Journals Inc.