Calculation method of maximum wind power grid-connected capacity based on grid critical inertia
A calculation method and grid technology, applied in power network operating system integration, power generation forecast in AC network, wind power generation, etc., can solve miscutting wind turbines, lack of scientific and reasonable wind power cut off, sacrificing power generation efficiency and reliable power supply sex and other issues to achieve the effect of ensuring safety and stability
Active Publication Date: 2022-04-08
CHINA THREE GORGES UNIV
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Problems solved by technology
At present, when dealing with the frequency safety and stability problems caused by large-scale wind power grid integration, the "one size fits all" large-area wind farm cut-off method is mainly adopted to eliminate potential safety hazards. Unnecessary generation efficiency and supply reliability
Therefore, in the face of hidden dangers of frequency safety accidents, the current power grid dispatching control lacks scientific, reasonable, and accurate theoretical methods and measures for determining the amount of wind power removal.
Method used
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[0100] The calculation method of maximum wind power grid-connected capacity based on frequency critical safety constraints and inertia prediction, the implementation flow chart is as follows figure 1 shown, including the following steps:
[0101] Step 1: Predict and calculate the grid inertia H(t j )for:
[0102]
[0103] In the above formula, i represents the i-th synchronous generator or the i-th wind farm. h Gi , S Gi Respectively, the inertia time constant and rated capacity of each synchronous generator set in the jth period of the next day provided by the power generation plan of the day before, m represents the number of synchronous generators in the power grid; H WFi , S WFi Respectively, the inertial time constant and rated capacity of each wind farm in the jth period of the next day provided by the wind power forecast information of the day before, n represents the number of wind farms in the grid; when the wind turbines do not have inertial response capabil...
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Based on the calculation method of the maximum wind power grid-connected capacity based on the critical inertia of the grid, the grid inertia H(t j ); According to the maximum power shortage of the power grid and the minimum value of the frequency drop, the critical inertia H of the power grid is solved min , so that the grid critical inertia H min Satisfied that when the maximum power shortage occurs, the minimum value of frequency drop does not exceed the safety limit; compare the grid inertia H(t j ) and grid critical inertia H min Size, screening is less than grid critical inertia H min time period; according to the grid critical inertia H min , to solve the maximum grid-connected capacity S of the wind farm in the period below the critical inertia of the grid WFmax . The technology of the invention can finely decide the real-time maximum grid-connected capacity and removal amount of wind power in time intervals, avoid "miscutting" wind power capacity, and provide scientific theoretical basis and technical measures for power grid dispatching control in frequency safety accident handling.
Description
technical field [0001] The invention relates to the technical field of frequency security and stability analysis of power systems containing wind power, in particular to a calculation method for maximum wind power grid-connected capacity based on frequency critical safety constraints and inertia prediction. Background technique [0002] The large-scale and high proportion of wind power access has continuously reduced the inertia of the power grid, and the ability of the power grid to maintain frequency stability has been seriously weakened. In academia, it is widely proposed to use wind power virtual inertia control method to solve this problem, but because the implementation of virtual inertia control technology will sacrifice the economy of wind power generation and the life of the unit, the actual application rate of this technology is extremely low, and it has not yet been used in my country. Or planning for technological transformation. At present, when dealing with fre...
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IPC IPC(8): H02J3/38H02J3/46H02J3/24H02J3/14
CPCH02J3/381H02J3/466H02J3/24H02J3/144H02J3/004H02J2203/20H02J2300/28H02J2300/40Y04S20/222Y02E10/76Y02B70/3225
Inventor 李世春田冰杰舒征宇钟浩薛臻瑶罗颖
Owner CHINA THREE GORGES UNIV