Tripping logic simulating method for alternating current filters of direct-current converting station

Abstract

The present invention provides a tripping logic simulating method for alternating-current filters of a direct-current converting station. A simulated loop model automatically cuts off a group of alternating-current filters according the voltage and the lasting time of an alternating-current bus of the current converting station; the alternating-current voltage of the alternating-current bus in the loop is adopted as an input parameter; the constant values of different over-voltage protection sections are compared through a plurality of comparative loop modules; an 'OR' gate outputs '1' or '0' level signals; after '1' signals are output when any constant-value condition of the protection section is met, a certain of delay requirements of relevant action are met, and one small group of alternating-current filters can be cut off, so that the over voltage of the alternating-current bus can be reduced; a plurality of small groups of alternating-current filters are continuously and successively cut off till the alternating-current voltage of the current converting station is lowered to a required value, so that the over voltage of the alternating-current bus is inhibited, and the safe running of a direct-current system is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of direct current transmission and relates to a logic simulation method for tripping an AC filter of a direct current transmission converter station. Background technique [0002] The converter station of the DC transmission system is equipped with a large number of AC filters to provide the reactive power required for the operation of the converter and filter out the harmonics generated during the operation of the converter. When the AC system connected to the converter station fails or the DC system is blocked and causes partial or full load shedding of the DC system, the capacitive reactive power of the AC filter capacitor connected to the converter station will be excessive, which will cause the overvoltage of the converter station to rise to varying degrees. High, it will pose a certain threat to the converter station equipment, so it is necessary to remove a certain number of AC filter groups in time t...

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Problems solved by technology

When the AC system connected to the converter station fails or the DC system is blocked and causes partial or full load shedding of the DC system, the capacitive reactive power of the AC filter capacitor connected to the converter station will be excessive, which will cause the overvoltage of the converter station to rise to varying degrees. High, it will pose a certain threat to the converter station equipment, so it is necessary to cut off a certain number of AC filter groups in time to suppress the further increase of overvoltage, but at the same time, it must also meet the needs of the DC system that continues to operate. Therefore, it is necessary to reasonably set the cut-off logic of the AC filter. At present, there is no mature simulation method for the trip logic of the AC filter of the HVDC converter station. It is necessary to establish a suitable model for the simulation research in the study of the AC overvoltage of the converter station.

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