Optimal operation strategy of energy storage applied in wind power integration based on chance-constrained programming

Abstract

Large-scale wind power integration brings about many challenges to power system. Energy storage is regarded as an effective solution to the problems and some demonstration projects have been constructed. As the output power of wind turbines is a stochastic variable which is determined by wind velocity, it is very difficult to choose the operation strategy of energy storage. Probability method can be a wise selection of this kind of problem. Mathematical model for seeking the energy storage operation strategy is developed based on chanceconstrained programming. Genetic algorithm is used to solve the optimization problem, and Monte-Carlo method is applied to deal with the chance-constrained question. Index Terms-Energy storage, operation strategy, wind power integration, chance-constrained programming I. INTRODUCTIONind power is undergoing an rapid development period, and wind power penetration becomes higher and higher. The intermittency and fluctuation of wind power will do harm to economic operation and security of power system, but the energy storage technology provides an effective solution to these problems [1] .Energy storage has been widely used in power system all over the world till now, especially the pumped hydro storage, it helps to improve the security of power system and serves as spinning or stand reserve. Many other forms of energy storage are also introduced to power system such as compressed air energy storage, flywheel energy storage, battery energy storage, superconducting magnetic energy storage, super capacitor energy storage and etc [2][3][4][5] . Different energy storage technologies can provide different sizes and capacity systems to satisfy different kinds of requirements.Stochastic fluctuation and intermittency of wind power is the reason why it does harm to power system. Energy storage can exactly compensate the disadvantages of wind power, decrease the reserve capacity and improve the reliability of power system. Many demonstration projects have been constructed in USA and Europe, such as a 450kW super-This work was supported by National Key Technologies R&D Program of China (2008BAA14B02).Yue Yuan is with the