基于歷史尋優(yōu)的火電機組運行優(yōu)化研究
[Abstract]:At present, our country is faced with a series of problems, such as severe population, bad environment and high primary energy consumption. In order to realize the sustainable development of economy and society, we must take the road of saving resources. Taking green and low carbon as the main line, the 13th Five-Year Plan for Energy Resources has for the first time set such a target. China will limit its energy consumption plan to within 5 billion tons of standard coal by 2020. Therefore, thermal power enterprises have to consider reducing energy consumption to enhance market competitiveness. It is the basic purpose of the operation parameter optimization to adopt the reasonable optimization of the controllable operating parameters of the units in the power plant to ensure that the units can achieve the best operation state under different operating conditions. At the same time, it is also an important means to achieve energy saving and consumption reduction. There are some uncertain problems due to the complex nonlinearity and noise pollution of a large number of operation data in power plants. In order to ensure the authenticity and validity of the data, this paper preprocesses the historical data. Then the concept of sensitivity factor is put forward and sensitivity analysis is carried out. The magnitude of sensitivity factor of unit heat consumption rate and each boundary parameter is analyzed and the parameters with larger energy consumption sensitivity factor are obtained. Fuzzy C-means clustering algorithm is used to partition the data. After the working condition is divided, this paper takes the operation initial pressure optimization of the unit as an example, carries on the historical optimization, and finds out the optimal initial pressure of the same working condition, which is the basis for the subsequent modeling. In this paper, the improved BP and RBF neural networks are used to establish the model between the boundary parameters and the main steam pressure. By analyzing the relative error of the two modeling methods, the RBF neural network method is selected to model the model. Finally, according to the overall model of the unit, it is verified that the optimal main steam pressure variation obtained by the model accords with the theoretical law and proves the effectiveness of the optimization model under the condition of changing the boundary conditions. The research work of this paper has certain theoretical significance and practical value to the analysis of the optimization problem of unit operating parameters.
【學位授予單位】:華北電力大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:TM621
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