Method for determining DC (direct current) running range of high-voltage DC transmission system in AC (alternating current) fault
A technology of direct current and high voltage direct current, applied in the direction of AC network circuits, power transmission AC networks, circuit devices, etc., can solve the problems that the operating range of DC current cannot be determined, there is no theoretical basis, etc., to reduce the probability of commutation failure, Improved stability and improved recovery performance
Active Publication Date: 2018-11-13
SOUTH CHINA UNIV OF TECH +1
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[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 (direct current) running range of a high-voltage DC transmission system in an AC (alternating current) fault. The probability of subsequent commutation failures of a high-voltage DC can be reduced, AC fault recovery performance of the high-voltage DC transmission system can be effectively improved, and the method has great significance for improvement of stability of an AC and DC hybrid transmission system. The method comprises the following steps: solving upper limit values of DC command values in three-phase symmetrical and asymmetricalfaults in real time according to a voltage-current characteristic function, calculating reactive power compensated by an AC filter based on an instantaneous power theory in real time, determining anexpected value of the reactive power consumption of a converter by setting reactive power exchange capacity between the AC system and a converter station to a certain expected value, solving the current command value under the working condition, and finally, taking the smaller value and determining the final command value of the DC through a limiting link. Therefore, the probability of subsequentcommutation failure of the high voltage DC can be reduced, AC fault recovery performance of the high voltage DC transmission system is effectively improved, and the method has great significance for improvement of stability of the 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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Login to View More 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