Voltage equalizing method and device of converter valve, controller and storage medium
A converter valve and AC voltage technology, applied in the field of converter valve pressure equalization method, controller, storage medium, and device, can solve the problems of inability to meet the partial discharge test and failure of the partial discharge test of the converter valve, etc.
Active Publication Date: 2022-02-18
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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Problems solved by technology
[0003] In the partial discharge test of the converter valve, it is necessary to carry out pressure equalization control on the power unit, so as to avoid the overvoltage protection action of the converter valve from bypassing the power unit, resulting in the failure of the partial discharge test of the converter valve
However, the traditional pressure equalization method of the converter valve is only suitable for the unlocked operating state. If it is directly applied to the partial discharge test, it will fail to meet the requirements of the partial discharge test
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[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not intended to limit the present application.
[0044] With the development of flexible direct current transmission technology, flexible direct current transmission converter valves have been widely used in backbone networks. The voltage level of the converter valve has been continuously improved, and it has been successfully applied in the fields of long-distance transmission of electric energy, large-capacity renewable energy grid connection, and asynchronous grid interconnection. For the safe operation of the converter valve, after the design of the valve tower structure and power unit is completed, the converter val...
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The invention relates to a converter valve voltage equalizing method and device, a controller and a storage medium. The method comprises the following steps of when a converter valve is in a steady-state operation state, obtaining a phase interval when a partial discharge instrument exits a detection state and a real-time phase of an AC voltage signal; for each period of the AC voltage signal, if the real-time phase is in a target phase interval, determining a target working state of each power unit according to a voltage difference value between the power units; and outputting a first steady state control signal to each power unit based on the target working state of each power unit so that a current working state of each power unit is the corresponding target working state. By adopting the method, the working state of the power unit can be randomly switched, and the partial discharge test standard is not influenced by the state switching of the power unit, so the partial discharge test is smoothly carried out.
Description
technical field [0001] The present application relates to the technical field of flexible direct current transmission, in particular to a method, device, controller and storage medium for pressure equalization of a converter valve. Background technique [0002] With the development of flexible direct current transmission technology, flexible direct current transmission converter valves have been widely used in backbone networks. The voltage level of the converter valve has been continuously improved, and it has been successfully applied in the fields of long-distance transmission of electric energy, large-capacity renewable energy grid connection, and asynchronous grid interconnection; after the design of the valve tower structure and power unit of the flexible HVDC converter valve is completed, it needs to be Several type tests, including partial discharge tests. [0003] In the partial discharge test of the converter valve, it is necessary to carry out pressure equalizati...
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IPC IPC(8): G01R31/12H02J3/38H02J3/36G05B15/02
CPCG01R31/1227H02J3/38H02J3/36G05B15/02Y02E60/60
Inventor 谢榕昌许斌斌陆汉东蔡振华凌怡珍曾令江王国强陈奥博王遂彭莱欧嘉俊
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD