考慮風電預測誤差分布特性的機組組合模型與算法
[Abstract]:Energy is the key to the sustainable and rapid development of the economy and society, but the increasing shortage of the fossil energy and the deteriorating living environment make the traditional energy supply system facing a severe challenge. Therefore, clean renewable energy, such as wind power and solar energy, is constantly concerned. The wind power generation has become one of the main power sources of the power system because of its mature technology, better investment return effect and policy support. However, due to the randomness of wind energy, wind power can provide clean energy and reduce carbon emission, and also brings great challenges to the dispatching and operation of the power system. On the one hand, the random fluctuation of wind power is difficult to grasp accurately. Although the prediction of wind power has made great progress through long-term research, its prediction accuracy is still difficult to meet the needs of the actual project. Therefore, it is necessary to analyze and grasp the error characteristic of the prediction result on the basis of the existing prediction technology, so as to reduce the influence of the random fluctuation of the wind power on the decision-making behavior such as the combination of the unit and the economy, and realize the high-efficiency utilization of the wind power prediction information. On the other hand, the wind power of random fluctuation is difficult to coordinate with the traditional deterministic scheduling mode. The continuous increase of the wind power permeability brings great economic and environmental benefits to the system, and the uncertainty of the system operation is also increased, and the traditional deterministic unit combination and the economic dispatching mode obviously have difficulty in coping with the uncertainty caused by large-scale wind power access. Therefore, how to realize the effective connection between the volatility wind power and the deterministic unit combination is of great theoretical and practical significance to improve the operation economy and safety of the power system. In this paper, the accurate expression of the characteristic of the wind power prediction error is first studied, then its application in the unit combination is discussed, and the combination method of the unit considering the timing characteristics of the prediction error is put forward to improve the economy and safety of the wind power system. The main work can be summarized as follows: (1) The probability distribution characteristic of the wind power prediction error is studied, and the prediction error is fitted and analyzed by the parameter and the non-parameter estimation method, including the normal distribution, the Beta distribution, the T-location-scale distribution, and the non-parameter kernel density estimation method. And further improving the evaluation index of the fitting effect of the existing test probability density function. Using the actual wind power to predict the error data, the effects of different fitting methods and different fitting parameters on the fitting effect are compared and analyzed. (2) Considering the difference of the wind power prediction error under different power levels and different time periods, a method for fitting the error segment under the power-time sequence dimension is proposed, and the error fitting precision is improved by simultaneously segmenting the power and the time sequence. In view of the excessive partition problem, a section reduction method is proposed to solve the contradiction between the number of the packets and the fitting effect, so that the fitting precision is improved, and the fitting calculation amount is reduced, so that the method is more practical. The study shows that the method of fitting the error power-time-sequence feature can more accurately describe the distribution characteristics of the wind power prediction error. (3) A combined model of the combination of the prediction error timing distribution and the system standby classification can be considered at the same time. The model combines the timing characteristics of the prediction error with the timing characteristics of the combination of the units, so that the timing characteristics of the prediction error can be accurately grasped; meanwhile, the model is divided according to the traditional cost, the additional standby cost and the risk cost to different standby categories, And the model is solved by using a mixed particle swarm algorithm with a heuristic search principle.
【學位授予單位】:山東大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TM614
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