A current limiting method for grid frame adjustment based on improved rei equivalent
A current limiting method and grid technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problem that the calculation speed cannot meet the online calculation requirements of the power system and the calculation amount is large, achieve high practical value, strengthen online Computational power, avoiding empirical effects
Active Publication Date: 2020-04-24
CHINA THREE GORGES UNIV
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[0004] In view of the shortcomings of the traditional method, which has a large amount of calculation and the calculation speed cannot meet the online calculation requirements of the power system
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[0023] The present invention will be described in further detail below in combination with two embodiments and accompanying drawings, but the implementation manner of the present invention is not limited thereto.
[0024] like figure 1 As shown, it is a flow chart of the steps of a grid adjustment and current limiting method based on the improved REI equivalent provided by the present invention. Specifically, the method mainly includes the following steps:
[0025] Step 1: Obtain the basic data of the whole network in real time, and perform short-circuit calculation to find n potential sites exceeding the standard. For the exceeding site m, assume Z′ mm is the self-impedance of node m after the branch is disconnected, and the interrupting current value of the circuit breaker is i max , there is a superscalar for △i=i m -i max . Then the minimum increment of the self-impedance of the exceeding standard node is:
[0026]
[0027] If any branch i-j (i≠j) of the network ...
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The invention relates to an improved REI equivalence-based grid adjustment current limitation method. The method comprises the steps of firstly, performing dynamic equivalent improvement on a conventional REI equivalent method, and determining a parameter of a power generator by aggregation of a power transmission factor of each power generator on a virtual branch during the equivalent process; secondly, solving a system network parameter under a short-circuit current exceed-standard screen by combining an open-circuit current limiting mechanism and employing an extracted method; and finally, selecting an optimal open-circuit combination conforming to the current limiting requirement from a research system. By the method, the optimal breakage line scheme can be rapidly sought without full-network traversing; and moreover, the method has the advantages that the calculation quantity during the equivalent process is small, the equivalent result is high in accuracy, the original network dynamic characteristic can be maintained very well, and the method is particularly and suitably used for on-line equivalent simplification.
Description
technical field [0001] The invention relates to the field of power system analysis and calculation, in particular to a grid adjustment and current limiting method based on improved REI equivalents. Background technique [0002] With the continuous expansion of the grid scale and the increasingly close connection between regional grids, the short-circuit current level of the system is also increasing year by year. At present, some power grid enterprises are experiencing the test of excessive short-circuit current and have taken corresponding measures. From the point of view of the current limiting effect and the difficulty of engineering realization, the breaking line is widely used because it is easy to implement and does not require additional cost. In the actual power grid, stations with high short-circuit levels are often concentrated in a few areas. When selecting the optimal disconnection combination scheme, if you choose the method of traversing the entire network, it ...
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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 翁汉琍惠宇翔黄景光魏繁荣
Owner CHINA THREE GORGES UNIV