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Ai X.,Huazhong University of Science and Technology | Han X.,Huazhong University of Science and Technology | Wen J.,Huazhong University of Science and Technology | Yao W.,Huazhong University of Science and Technology | Luo W.,Liaoning Electrical Power Supply Co.
Diangong Jishu Xuebao/Transactions of China Electrotechnical Society

Wind power has the characteristics of volatility and uncertainty due to its large ramp events and difficulty of accurate prediction, which brings new challenges to power system operation. To cope with ramp event, this paper proposes an exact linearization unit commitment model with constraints of wind power ramp event. Wind power is described by its predicted values as well as the upper and lower limits of its interval prediction to solve the inaccurate prediction. Thus, this stochastic problem can be converted into a deterministic problem by linear robust optimization theory. Case studies are carried out based on a 10-machine 39-bus system with wind farms integration. Simulations show that, the constraints of large wind power ramp event should be considered to guarantee the security of power system, although the constraints of small wind power ramp event have no effect on unit commitment. In addition, since it is linear mixed integer programming, the proposed unit commitment model can be used in practical large-scale systems. © 2015, The editorial office of Transaction of China Electrotechnical Society. All right reserved. Source

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