Calculation method and start-up method for power grid frequency safe start-up margin
A technology of grid frequency and calculation method, which is applied in the direction of single-grid parallel feeding arrangement, electrical components, circuit devices, etc., can solve the problems of increasing grid frequency accidents and the inability of dispatchers to monitor the safe power-on margin of the grid online.
Active Publication Date: 2020-12-18
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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[0004] However, the existing primary frequency regulation performance estimation method is only for a single unit, and the estimation of the primary frequency regulation performance of the whole network is not yet clear, and there is no way to reasonably estimate the safe start-up of the power grid under the condition of ensuring frequency security. The method makes it impossible for dispatchers to monitor the safe start-up margin of the current power grid online, which increases the probability and degree of frequency accidents in the power grid
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[0042] The technical solutions of the embodiments of the present invention are explained and described below, but the following embodiments are only preferred embodiments of the present invention, not all of them. Based on the examples in the implementation manners, other examples obtained by those skilled in the art without creative efforts all belong to the protection scope of the present invention.
[0043] A method for calculating a safe start-up margin based on power grid frequency stability, comprising the following steps:
[0044] S1. Obtain the total installed power of the grid connected to the grid within a certain period of time under the condition of only one frequency regulation, the maximum missing power during this period, and the minimum frequency of the grid during this period;
[0045] S2. According to the total installed power of grid-connected grid, the maximum missing power and the minimum frequency of the grid, the frequency stability of the grid during th...
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The invention relates to a safe start-up margin calculation method and a start-up method based on power grid frequency stability. The following technical scheme is used by aiming at the deficiency that there is no power grid safe start-up margin calculation method in the prior art. The safe start-up margin calculation method based on the power grid frequency stability comprises the following steps: S1, obtaining the total power grid-connected installed power, the maximum missing power and the minimum power grid frequency only under the condition of primary frequency modulation; S2, obtaining the power grid frequency stability according to the total power grid-connected installed power, the maximum missing power and the minimum power grid frequency; S3, obtaining the theoretical start-up power required under a specific missing power and a specific power grid accident frequency according to the power grid frequency stability; and S4, subtracting the theoretical start-up power from the total grid-connected installed power within the period so as to obtain the safe start-up margin. The calculation of the start-up margin under the safe power grid frequency can be simply and effectivelyrealized.
Description
technical field [0001] The invention relates to the technical field of calculating the frequency stability performance of large-scale power grids and generator sets, and more specifically, to a method for calculating a safe start-up margin and a start-up method based on the frequency stability of the power grid. Background technique [0002] The failure of the UHV transmission system will cause the power grid to suddenly lose high-power power supply, which will have a huge impact on the frequency of the power grid and seriously threaten the safe and stable operation of the power grid. When a large disturbance occurs in the grid frequency, the generator set with the primary frequency regulation function can respond quickly, effectively suppress the fluctuation range of the grid frequency, shorten the transition time of the fluctuation, and quickly stabilize the change of the grid frequency. In the time period of ten seconds after the grid frequency fault, the only thing that ...
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IPC IPC(8): H02J3/24H02J3/38H02J3/46
CPCH02J3/24H02J3/381H02J3/46
Inventor 苏烨张江丰尹峰宣晓华魏路平卢敏汪自翔戴航丹孙坚栋丁伟聪
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY