Maximum wind power grid-connected capacity calculation method based on frequency critical safety constraint and inertia prediction
A critical safety, calculation method technology, applied in power generation forecasting, wind power generation, power network operating system integration in AC network, etc. Wind turbines, etc.
Active Publication Date: 2021-02-23
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.
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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 power grid; when the wind turbines do not have inertial response c...
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The invention discloses a maximum wind power grid-connected capacity calculation method based on frequency critical safety constraint and inertia prediction. The method comprises the following steps:calculating the inertia H(tj) of a power grid in each time period of the next day through the day-ahead power generation plan information of the power grid and a wind power prediction curve of a windpower plant; solving the critical inertia Hmin of the power grid according to the requirements of the maximum power vacancy and the frequency drop minimum value of the power grid, and enabling the critical inertia Hmin of the power grid to meet the condition that the frequency drop minimum value does not exceed a safety limit value when the maximum power vacancy occurs; comparing the power grid inertia H(tj) and the power grid critical inertia Hmin of each time period of the next day, and screening the time period smaller than the power grid critical inertia Hmin; and according to the criticalinertia Hmin of the power grid, solving the maximum grid-connected capacity SWFmax of the wind power plant in the period of time lower than the critical inertia Hmin of the power grid. According to the technology, the real-time wind power maximum grid-connected capacity and removal amount can be finely decided in a time-phased mode, the wind power capacity is prevented from being mistakenly cut off, and a scientific theoretical basis and technical measures are provided 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