Method for analyzing frequency characteristics of electric power system containing wind power based on double-grid difference method
A technology of power system and analysis method, applied in the field of power system, can solve the problems of low analysis efficiency and low analysis accuracy, and achieve the effect of shortening the numerical solution time
Pending Publication Date: 2022-03-04
ECONOMIC & TECH RES INST OF HUBEI ELECTRIC POWER COMPANY SGCC +1
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[0004] The purpose of the present invention is to overcome the defects and problems of low analysis accuracy and low analysis efficiency in the prior art, and provide a high analysis accuracy and high analysis efficiency based on the double-grid difference method for the frequency characteristics of power systems containing wind power Analytical method
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[0190] see figure 1 , a method for analyzing the frequency characteristics of a power system with wind power based on the dual-grid difference method, including the following steps:
[0191] S1. Establish the power fluctuation model of the power system including wind power; specifically, the following steps are included:
[0192] S11. Standard deviation of wind power fluctuation σ 2 It is closely related to the proportion of wind turbine output in the whole system, and the standard deviation of wind power fluctuation after calculation is calculated
[0193]
[0194] In the above formula, a is the time-scale coefficient of wind power fluctuation, which indicates the change of wind power output variation with time scale; z α1 is the α1 quantile point of the standard normal distribution, indicating the distribution characteristics of wind power fluctuations; η is the proportion of wind power output; b is the smoothing effect index of wind power fluctuations, indicating the...
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The invention discloses a frequency characteristic analysis method of a wind power-containing electric power system based on a double-grid difference method. The method comprises the following steps: S1, establishing a power fluctuation model of the wind power-containing electric power system; s2, establishing a stochastic dynamic model of the power system; s3, establishing a primary frequency modulation model of the wind power-containing electric power system; s4, analyzing the characteristics of the primary frequency modulation model of the wind power-containing electric power system to obtain an FPK equation of the stochastic dynamics model of the wind power-containing electric power system; and S5, solving a frequency probability distribution density function of the wind power-containing power system. According to the design, a primary frequency modulation model containing a wind power electric power system is established, an FPK equation about a system frequency probability distribution density function is obtained, a double-grid difference iterative numerical algorithm is adopted, the advantages of a finite element method and a finite difference method are combined, the probability distribution function of the system frequency is accurately and rapidly obtained, and the probability distribution density of the system frequency is calculated. And reference is provided for power grid frequency modulation capability analysis, frequency modulation parameter optimization, unit economic operation and the like.
Description
technical field [0001] The invention relates to the technical field of power systems, in particular to a method for analyzing frequency characteristics of power systems containing wind power based on a double-grid difference method, which is mainly applicable to improving analysis accuracy and efficiency. Background technique [0002] Power system frequency is one of the important criteria to measure power quality, and it is also an important parameter to describe the balance of power generation and consumption in the grid. The proportion of new energy output in the new power system continues to increase, conventional and traditional units are replaced by a large number, and the inertial support capability and frequency adjustment capability of the power system change; in addition, the randomness of new energy output increases the complexity of power fluctuations in the power system , the difficulty of analyzing the system frequency probability distribution characteristics i...
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IPC IPC(8): G06F30/23G06F17/11G06F17/18G06Q10/06G06Q50/06G06F111/10G06F113/04G06F119/14
CPCG06F30/23G06F17/11G06F17/18G06Q10/067G06Q50/06G06F2113/04G06F2119/14G06F2111/10Y02E40/70Y04S10/50
Inventor 张东寅许汉平杨东俊魏聪李亚馨王怡聪胡婷王法靖乔立童雅芳颜炯桑子夏徐秋实阮博周思璇孙建军盛举
Owner ECONOMIC & TECH RES INST OF HUBEI ELECTRIC POWER COMPANY SGCC