Method for selecting direct-current line fault restart voltage of high-voltage direct-current power transmission system
A DC line fault, high-voltage DC technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problem of unable to automatically select other voltage levels to restart, to meet the needs of fault restart, and the amount of DC power loss is small Effect
Inactive Publication Date: 2020-05-26
CHINA SOUTHERN POWER GRID COMPANY
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[0003] At present, the restart voltage levels of HVDC power transmission system include full-voltage restart, 80% reduced voltage restart and 70% reduced voltage restart. The three restart voltage levels are set by the operator on the HMI interface of the operating workstation. Once set to a certain restart voltage (such as 80% step-down restart), the high-voltage DC system will restart according to the set voltage level (80% step-down restart) after the DC line fails, and cannot automatically select other voltage levels to restart
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[0017] In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
[0018] Such as figure 1 As shown, this embodiment provides a method for selecting the restart voltage of a DC line fault in a HVDC power transmission system, which specifically includes:
[0019] (1) Set the control word "restart voltage level automatic selection" on the DC operation control interface HMI;
[0020] (2) If the "restart voltage level automatic selection" is enabled on the HMI, after the DC line fails, the HVDC power transmission system will select the restart voltage level according to the following principles:
[0021] a) If the actual unipolar DC power of the HVDC transmission system is >80% of the unipolar rated power, the restart voltage level shall be selected as "full voltage restart";
[0022] b) If the act...
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The invention discloses a method for selecting direct-current line fault restart voltage of a high-voltage direct-current power transmission system. The method comprises the steps that a restart voltage grade automatic selection function is added into a direct-current power transmission control system; when the restart voltage grade automatic selection function is put into use, the high-voltage direct-current power transmission system selects the restart voltage grade according to the relationship between the actual single-pole direct-current power and the single-pole rated power after the direct-current line fails; and when the restart voltage grade automatic selection function exits, the high-voltage direct-current power transmission system is restarted according to a preset voltage grade after the direct-current line fails, wherein the set restart voltage grade is full-voltage restart, 80% step-down restart or 70% step-down restart. According to the direct-current line fault restartvoltage selection method, the direct-current line fault restart requirement can be met, and it can be guaranteed that the direct-current loss power amount is the minimum after restart.
Description
technical field [0001] The invention relates to a direct current transmission technology, in particular to a method for selecting a restart voltage of a direct current line fault in a high voltage direct current transmission system. Background technique [0002] The DC line fault restart function is a common DC control function in the HVDC transmission system. When a fault such as grounding occurs in the high-voltage DC line, the DC line fault restart function can be used to quickly control the DC line current to zero and the DC voltage to zero, and After a certain line de-ionization time, restart to establish DC voltage and DC current, so as to eliminate DC line faults. DC step-down restart is beneficial to quickly restore line insulation after DC system failure, improve the success rate of restarting DC line failures caused by lightning strikes or wildfires, and reduce unnecessary outages of HVDC transmission systems to a certain extent. [0003] At present, the restart v...
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IPC IPC(8): H02J3/36H02H3/06
CPCH02H3/06H02J3/36Y02E60/60
Inventor 谢惠藩梅勇徐光虎刘洪涛李鹏
Owner CHINA SOUTHERN POWER GRID COMPANY