Method for determining DC current operating range of HVDC transmission system during AC fault
A DC current, high voltage DC technology, applied in AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problems of undetermined DC current operating range, no theoretical basis, etc., to improve recovery performance and improve stability , the effect of reducing the chance of subsequent commutation failures
Active Publication Date: 2021-07-30
SOUTH CHINA UNIV OF TECH +1
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Problems solved by technology
[0004] The relevant parameters of the current command value in the low-voltage current limiting function come from engineering experience or obtained through simulation tests, and there is no theoretical basis, especially when the AC fault occurs, the DC current operating range of the HVDC transmission system cannot be determined
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[0035] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. A preferred embodiment of the invention is shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0037] When t...
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The invention discloses a method for determining the DC current operating range of a high-voltage direct current transmission system when an AC fault occurs, which can reduce the probability of subsequent commutation failure of the high-voltage direct current transmission system, effectively improve the AC fault recovery performance of the high-voltage direct current transmission system, and contribute to the improvement of the AC-DC hybrid transmission system The stability is of great significance. The method includes: the present invention solves the upper limit value of the DC current command value under the three-phase symmetrical and asymmetrical faults in real time according to the voltage-current characteristic function, and then performs real-time real-time calculation of the reactive power compensated by the AC filter based on the instantaneous power theory. Calculation, by setting the reactive power exchange between the AC system and the converter station as a certain expected value, determine the expected value of the reactive power consumption of the converter, and solve the current command value under this working condition, and finally take the smaller of the two and pass The limiting link determines the final command value of DC current, which can reduce the probability of subsequent commutation failure of HVDC, effectively improve the AC fault recovery performance of HVDC transmission system, and is of great significance to improve the stability of AC-DC hybrid transmission system.
Description
technical field [0001] The invention relates to the technical field of high voltage direct current, in particular to a method for determining the operating range of direct current of a high voltage direct current transmission system when an alternating current fault occurs. Background technique [0002] High-voltage direct current has been widely used in long-distance high-power transmission and interconnection of asynchronous power grids. There are more than 30 direct current transmission lines in operation and under construction in my country. my country's power grid has become the most complex AC-DC hybrid power grid in the world. The converters at both ends of the DC system consume a large amount of reactive power during operation. Generally, the reactive power consumed by the rectifier and inverter is about 30% to 50% and 40% to 60% of the active power delivered. When the AC system fails, the DC voltage and the voltage of the converter bus near the converter station wil...
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IPC IPC(8): H02J3/36
CPCH02J3/36H02J2203/20Y02E60/60
Inventor 汪娟娟傅闯黄梦华李战鹰李欢王子民李子林龚英明黄星海
Owner SOUTH CHINA UNIV OF TECH