大規(guī)模風(fēng)電接入的概率潮流研究
[Abstract]:Wind power generation technology is becoming more and more mature, and wind power is connected to the grid on a large scale in our country, and many wind turbines are connected to the power grid. However, in areas where wind power resources are extremely rich, there is a phenomenon of "abandoning wind". When the wind farm is full of electricity, the power generated by the wind farm can not be fully integrated into the power grid, that is to say, the acceptance capacity of the grid to the power generation of the wind farm is limited by the transmission capacity of the tie line. At the same time, there is a strong correlation between the output of adjacent wind farms. If large-scale wind power is connected to the power grid, the uncertainty of system power flow will be increased, and the safe operation of power system will be seriously affected. In this paper, a probabilistic power flow calculation method, which takes into account the correlation of wind power output and the acceptability of power grid, is presented. It is applied to the actual engineering project of Ningxia power grid and the static security analysis of power system. (1) A probabilistic power flow calculation considering the acceptability of power grid is proposed. Based on the wind power output model considering the capacity of power grid to accept wind power, the probability distribution is expressed in the form of piecewise function, and an improved Latin hypercubic sampling method is proposed. The results of an example show that the proposed probabilistic power flow calculation method can overcome the deficiency that the traditional Latin hypercubic sampling can not sample the random variables of irregular probability distribution. The calculation results are similar to those of the Monte Carlo simulation method based on random sampling when the sampling size is greatly reduced. The difference of power flow probability distribution of different branches under single wind farm access is compared and analyzed. (2) A probabilistic power flow calculation considering the correlation of wind power output and the acceptance capacity of power grid is proposed. The correlation analysis method of wind power output based on historical data and Copula theory is studied, and an improved Latin hypercubic sampling method is proposed, which is suitable for both known and unknown probability distribution wind power output models. The proposed probabilistic power flow calculation not only takes into account the acceptability of the power grid, but also can deal with the nonlinear correlation between the outputs of different wind farms. The results of an example show that the method proposed in this paper has great advantages in accuracy and speed, and also shows the necessity of taking into account the correlation of wind power output. (3) combined with the actual engineering project of Ningxia Power Grid, The probabilistic power flow calculation, which takes into account the correlation of wind power output and the acceptance capacity of power grid, is applied to the operation state analysis of Ningxia power grid. The operation results of the system verify that the method proposed in this paper can efficiently and accurately analyze the probabilistic power flow distribution characteristics of large-scale wind power connected to Ningxia power grid. A visual analysis system for probabilistic power flow calculation of Ningxia power grid is developed based on GUI of MATLAB software. (4) the probabilistic power flow calculation method proposed in this paper is applied to the static security analysis of power system. In order to speed up the analysis, an expected accident sorting index based on branch available capacity entropy and a sorting method based on multi-scene are proposed. The results of numerical examples show that the method can accurately evaluate the static security of the system and quickly identify the potential weaknesses.
【學(xué)位授予單位】:南京理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM614;TM744
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