Method for quickly calculating wind-power allocation ratio based on trajectory sensitivity
A technology of trajectory sensitivity and configuration ratio, which is applied in wind power generation, single grid parallel feeding arrangement, etc.
Active Publication Date: 2015-04-29
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology
At present, the large-scale centralized grid connection of wind power has been realized, which brings economic benefits to the power grid and also brings about stable and safe operation of the power grid.
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[0046] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0047] This embodiment provides a fast calculation method for wind power allocation ratio based on trajectory sensitivity, the flow chart of which is as follows Figure 8 shown, including the following steps:
[0048] 1) Set the number of iterative calculations i=0, and set the initial value of wind power configuration ratio β 0 =0.5, and 0≤β≤1;
[0049] 2) According to the wind power configuration ratio β i Generate the operation mode, and use the power flow calculation method to calculate the power flow of the system including wind power;
[0050] 3) Set the assessment fault, perform transient simulation, and calculate the trajectory sensitivity of the system state quantity x based on the trajectory;
[0051] Among them, the dynamic process of the power system can be expressed by the following set of differential a...
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The invention relates to a method for quickly calculating wind-power allocation ratio based on trajectory sensitivity. Without considering wind-power fluctuation, the method comprises the steps that initial wind-power allocation ratio is selected, the running mode is generated, and load flow calculation is carried out; transient stimulation is carried out, and trajectory sensitivity is obtained based on trajectory; trajectory sensitivity required is selected according to a problem needing studying, and trajectory sensitivity norms are obtained; the system critical wind-power allocation ratio is determined by judging whether the trajectory sensitivity norms are mutated; otherwise the wind-power allocation ratio is adjusted by using the trajectory sensitivity, and calculation is conducted again. On one hand, the calculation method is simple, the corresponding sensitivities can be freely selected according to state variables to be analyzed to obtain the norms, and the instability of a power system is judged by the mutation of the sensitivity norms; and on other hand, the reasonability of the existing wind-power allocation ratio of the power system is judged according to the critical wind-power allocation ratio, and the method has certain reference value in the aspects of scheduling, transient stability analysis and the like.
Description
technical field [0001] The invention relates to the field of electric power system automation, in particular to a method for quickly calculating wind power allocation proportions based on trajectory sensitivity. Background technique [0002] Wind energy is currently the most economical new energy that is widely used. At present, the large-scale centralized grid connection of wind power has been realized, which brings economic benefits to the power grid and also brings about stable and safe operation of the power grid. People have been paying attention to the impact of wind power on the power grid when the power system including wind power, especially with large-scale centralized grid-connected wind power, fails. In order to prevent wind power off-grid from causing a huge impact on the power grid in the event of a fault, a lot of experimental research and theoretical analysis have been done on large-scale centralized wind power grid-connected. Now wind-fire bundling has bec...
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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 郭小江汤奕赵丽莉孙玉娇王义红王雅婷
Owner CHINA ELECTRIC POWER RES INST