Normal distribution combination characteristic-based rapid probabilistic power flow calculation method
A technology of probabilistic power flow calculation and normal distribution, which is applied to AC networks, AC network circuits, and circuit devices with the same frequency from different sources, can solve the problems of state variables deviating from normal distribution and deviating from normal distribution, and achieve The effect of improving the efficiency and accuracy of the solution and simplifying the process of solving the probability distribution
Active Publication Date: 2016-04-27
CHINA AGRI UNIV
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However, the power flow calculation results of nodes and branches close to the wind power access point in the power system deviate seriously from the normal distribution. The combination effect will be better, and there is a higher requirement for whether the state variable deviates seriously from the normal distribution
Therefore, there are defects in the method of fitting the probability distribution of the system power flow through series expansion only by using the first few semi-invariants of the state variables
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[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.
[0022] The fast probabilistic power flow calculation method based on the combination characteristics of normal distribution described in the present invention comprehensively considers the following factors:
[0023] 1. Power system topology and data information;
[0024] 2. Wind farm output power data;
[0025] 3. Load power data.
[0026] Such as figure 1 shown, including the following steps:
[0027] A. Statistical wind farm output power and load power data, draw the kernel density probability distribution map of node injection power;
[0028] B. Solve the Gaussian mixture model parameters of node injection power, and clarify the characteristics of each sub-Gaussian;
[0029] C, the sub-Gaussian combination of injection power of each node represents the multi-scenario of node injection power;
[0030] D. Using the linearized AC power flow model, calc...
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The invention relates to a normal distribution combination characteristic-based rapid probabilistic power flow calculation method. The method comprises the following steps: counting output power and load power data of a wind power plant, and drawing a nuclear density probability distribution diagram of node injection powers; determining gaussian mixture model parameters of the node injection powers and marking clear the characteristics of various sub-gaussians; combining the sub-gaussians of the node injection powers to represent a plurality of scenarios of the node injection powers; calculating expectations and variances of state variables in each scenario by a linear AC power flow model; and calculating a normal distribution curve of the state variables in each scenario according to the expectations and variances of the state variables in each scenario, and determining the final probability density function of the state variables. According to the normal distribution combination characteristic-based rapid probabilistic power flow calculation method, data information of the node injection powers is fully utilized; the probability distribution determining processes of the node injection powers and the state variables are simplified; and the determining efficiency and accuracy of the probabilistic power flow are greatly improved.
Description
technical field [0001] The invention relates to the field of power system operation and control, in particular to a fast probability power flow calculation method based on normal distribution combination features. Background technique [0002] With the increasingly widespread application of new energy technologies, wind power is gradually developing from decentralized, small-scale development, and local consumption to large-scale, highly concentrated development, long-distance, and high-voltage transmission. The penetration rate of wind energy in the power system is also getting higher and higher, which increases the randomness of the power flow distribution in the power grid. The deterministic power flow calculation can no longer fully reflect the overall operation status of the power grid. It is suitable for the probabilistic power flow research of power system uncertainty analysis increasingly important. [0003] After the introduction of the probabilistic power flow mod...
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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 叶林张亚丽饶日晟
Owner CHINA AGRI UNIV