Method for judging stability of extra-high-voltage direct-current multi-drop-point grid
An ultra-high voltage direct current, multi-drop technology, applied in the electric power field, can solve the problems of difficulty in achieving the overall stability of the power grid, the result analysis is not objective and comprehensive, and the lack of theoretical basis, etc.
Active Publication Date: 2016-10-19
STATE GRID CORP OF CHINA +3
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[0004] In actual engineering, when using time-domain simulation to evaluate the stability level of the power grid, it is necessary to perform transient stability calculation scans on the power grid under various expected faults. The selection of expected fault sets is an enumeration method, which may be more dependent on the experience of engineers In summary, there is a lack of certain theoretical basis, the analysis of the results is not objective and comprehensive enough, and it is difficult to achieve an overall grasp of the stability characteristics of the power grid
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[0045] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but only to illustrate the essence of the technical solutions of the present invention.
[0046] The invention provides a method for judging the stability of an UHV DC multi-drop power grid. The UHV DC multi-drop power grid includes a DC system and an AC system, wherein the DC system includes n inverter stations electrically connected to each other, and n is a positive integer ≥ 3. The method includes the following steps:
[0047] Step 1. Calculate the risk R of n inverter stations;
[0048] Step 2, calculating the multi-infeed short-circuit ratio MSCR of n inverter stations;
[0049] Step 3. Calculate the stability H of the UHV...
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The invention discloses a method for judging the stability of an extra-high-voltage direct-current multi-drop-point grid. The extra-high-voltage direct-current multi-drop-point grid comprises a direct-current system and an alternating-current system, the direct-current system comprises n inversion stations which are electrically connected with one another, and the n is a positive integer which is larger than or equal to 3. The method comprises the following steps that 1, the risk degree R of the n inversion stations is calculated; 2, the multi-infeed short circuit ratio (MSCR) of the n inversion stations is calculated; 3, the stability H of the extra-high-voltage direct-current multi-drop-point grid is calculated by means of the risk degree R and the multi-infeed short circuit ratio (MSCR), wherein when the stability H is larger than or equal to Hstandard, the stability of the grid is higher than that of a general grid, and when the stability H of the grid is lower than Hstandard, the stability of the grid is lower than the general grid. By means of the method for judging the stability of the extra-high-voltage direct-current multi-drop-point grid, the stability of the grid can be determined on the whole, and overall grasp of the stability of the grid is achieved.
Description
technical field [0001] The invention relates to the field of electric power, in particular to a method for judging the stability of an UHV DC multi-drop power grid. Background technique [0002] With the full implementation of the strategy of "West-East Power Transmission, North-South Mutual Supply, and National Networking", my country is gradually building a UHV AC-DC hybrid transmission system that is rare in the world for trans-regional and long-distance transmission of huge power. The sexiness and difficulty are also rare internationally. For this kind of UHV DC multi-drop-point receiving-end grid, since multiple DC lines are placed on the same AC grid, and the electrical coupling between the converter stations is tight, and the reactive power consumption is large, the receiving-end system accepts the power fed in by the DC system. High, the interaction between AC and DC systems will be more serious. A fault in one DC system may affect the operation of another DC system...
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IPC IPC(8): H02J3/36G06F19/00
CPCY02E60/60
Inventor 王海潜曹敏敏谢珍建高斌史大军黄俊辉汪惟源祁万春
Owner STATE GRID CORP OF CHINA