A method for optimizing converter protection zones and action logic in UHV converter stations
A technology of action logic and optimization method, applied in the direction of emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve unreasonable division of converter protection areas, power outages, and inability to accurately identify whether the converter is faulty, etc. problems, to avoid the expansion of power outages and improve safety and reliability
Active Publication Date: 2022-05-20
STATE GRID NINGXIA ELECTRIC POWER CO +1
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[0002] Compared with conventional direct current, UHV DC has changed from a single converter to two series-connected converters for each pole. Under the operation mode of bipolar four-converter or bipolar three-converter or unipolar double-converter, Inverter protection area division is unreasonable, does not cover all converter equipment, cannot accurately identify whether the converter is faulty, and easily causes large-scale power outages and other problems
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[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0015] The embodiment of the present invention discloses a converter protection partition and action logic optimization method of an UHV converter station, which includes the following steps:
[0016] S1. Adjust the converter differential protection, pole bus differential protection, converter connection line differential protection, neutral bus differential protection range and partition of the UHV converter station;
[0017] S2. Optimize and adjust the prote...
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The invention discloses a method for optimizing the protection partition and action logic of the converter of an ultra-high voltage converter station, which includes: S1. The converter differential protection of the ultra-high voltage converter station, the pole busbar differential protection, and the converter connecting line Differential protection, neutral bus differential protection range and partitions are adjusted; S2. Optimize and adjust the protection control action logic after a single converter fault: when a fault occurs within the protection range of a single converter, the protection aspect changes from extremely poor to Active protection and converter differential protection action; in terms of control, first the pole where the fault point is located is blocked, the fault converter is isolated and the converter isolation corresponding to the opposite converter station is performed, and secondly the pole connection and automatic restart of the pole where the fault point is located are carried out. non-faulty converter, the non-faulty converter continues to run with power. The invention can realize accurate identification and isolation of faulty converters and continue energized operation of non-faulty converters, improve the safety and reliability of the overall operation of UHV DC, and avoid expanding the scope of power outages.
Description
technical field [0001] The invention relates to the technical field of ultra-high voltage direct current transmission, and more specifically relates to a converter protection partition and an operation logic optimization method of an ultra-high voltage converter station. Background technique [0002] Compared with conventional direct current, UHV DC has changed from a single converter to two series-connected converters for each pole. Under the operation mode of bipolar four-converter or bipolar three-converter or unipolar double-converter, The division of the converter protection area is unreasonable and does not cover all the converter equipment. It is impossible to accurately identify whether the converter is faulty, which is likely to cause large-scale power outages and other problems. [0003] Therefore, how to provide a converter protection partition and action logic optimization method for UHV converter stations that can effectively improve the safety and reliability o...
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IPC IPC(8): H02H7/22H02H7/26H02J3/36
CPCH02H7/22H02H7/268H02J3/36Y02E60/60
Inventor 史磊宋海龙刘志远于晓军韦鹏雷战斐柴斌刘若鹏毛春翔赵宇卿
Owner STATE GRID NINGXIA ELECTRIC POWER CO