Method and device for restarting a DC line fault in a multi-terminal HVDC transmission system
A DC line fault, high-voltage DC technology, applied in the direction of circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of high cost of stability control measures, long total time, and limited interruption capacity. Achieve the effect of meeting the DC line fault restart requirements, low cost, and stable grid frequency
Active Publication Date: 2021-12-14
CHINA SOUTHERN POWER GRID COMPANY
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Problems solved by technology
[0004] For a multi-terminal HVDC power transmission system with a high-speed parallel switch (HSS, High Speed Switch), due to the limited current interruption capability of the HSS switch, when the DC line fails, the rectifier side needs to cooperate with restart phase shifting to control the DC current to zero. The stability control device needs to take corresponding control measures after the restart fails to block the DC, such as taking measures such as cutting off the unit or load shedding. Judging that the total time of a series of sequences such as DC fault blocking is too long, if the DC transmission power is too large, in order to ensure the stability of the grid frequency after DC blocking or to ensure that other transient stability problems do not occur, it is necessary to remove a large number of units and a large number of loads to stabilize the control measures expensive
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[0020] 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.
[0021] Such as figure 1 As shown, this embodiment provides a multi-terminal high-voltage direct current transmission system DC line fault restart method, which is suitable for three-terminal and above high-voltage direct current transmission systems, specifically including:
[0022] (1) Set the power threshold value P_set for DC line fault restart on the DC operation control interface HMI, which can be calculated according to the stability strategy research.
[0023] (2) When the DC line protection device detects that a DC line of a certain station has a fault, it automatically calculates the total power Ptotal of 1 to j rectification stations, where the calculation method of Ptotal is as follows:
[0024]
[0025] Among them...
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The invention discloses a method and device for restarting a DC line failure of a multi-terminal high-voltage direct current transmission system, which is suitable for a three-terminal or higher high-voltage direct current transmission system. The method includes: setting a power threshold value P_set for restarting a DC line failure ; When a DC line fault is detected, the total power Ptotal of the rectifier station is calculated by the following formula; if Ptotal≤P_set, the DC line fault restart is allowed; if Ptotal>P_set, the DC line fault restart function is shielded, and no It allows DC line fault to restart, and directly blocks the DC pole where the DC line fault occurs. The DC line fault restart method of the present invention can not only meet the DC line fault restart requirement, but also ensure the minimum cost of the stability control measures.
Description
technical field [0001] The invention relates to a multi-terminal direct current transmission technology, in particular to a method and device for restarting a DC line failure of a multi-terminal high-voltage direct current transmission system. Background technique [0002] like image 3 As shown, the multi-terminal DC transmission system refers to the transmission system composed of three or more converter stations through a certain connection method, which can realize multi-point power supply and multi-point power reception. Because of the flexibility of power transmission, multi-terminal DC is the current HVDC transmission project. Direction of development. [0003] 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 li...
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IPC IPC(8): H02H3/06H02H3/42H02J3/36
CPCH02H3/066H02H3/42H02J3/36Y02E60/60
Inventor 谢惠藩徐光虎李鹏刘洪涛
Owner CHINA SOUTHERN POWER GRID COMPANY