Stochastic Security Constrained Unit Commitment with High Penetration of Wind Farms

Secure utilization of power system is one of the main challenges in restructured power systems. Wind energy, as a clean and cheap energy source, is gaining increasing attention in the operation of power systems all around the world. This paper presents a new formulation for simultaneous clearing of energy and reserve markets in the presence of wind farms. Different types of reserve are considered. The formulation considers the cost of each scenario in a two-stage short-term (24 hours) clearing process. Power systems are stochastic in nature. The uncertainties associated with the output of wind farms, generators and line outages are modeled in different system scenarios. The problem is linearized in order to be solved with standard mixed-integer linear programming packages. The idea is to model the Security Constrained Unit Commitment (SCUC) problem in a way that requires less variables and optimization constraints. As will be shown in the case study section, this will expedite the solution of the optimization problem. The performance of the proposed formulation is proven by applying it to the IEEE RTS1, presenting and discussing the results.