Multi-terminal high-voltage direct-current power transmission system direct-current line fault restarting method and device
A DC line fault, high-voltage DC technology, applied in circuit devices, emergency protection circuit devices, emergency protection devices with automatic disconnection, etc., can solve the problems of high cost of stable control measures, long total time, and limited current interruption capacity. Achieve the effect of meeting the needs of fault restart, low cost and stable grid frequency
Active Publication Date: 2020-05-22
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] like 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, j...
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The invention discloses a multi-terminal high-voltage direct-current power transmission system direct-current line fault restarting method and device, and the method is suitable for a high-voltage direct-current power transmission system with three or more terminals, and comprises the steps: setting a power threshold fixed value P_set of direct-current line fault restarting; when it is detected that the direct-current line breaks down, calculating the total power Ptotal of the rectifier station through the following formula as shown in the description; if the Ptotal is less than or equal to the P_set, permitting fault restart of the direct-current line; and if Ptotal>P_set, shielding the fault restart function of the direct current line, not allowing the fault restart of the direct currentline, and directly locking the direct current electrode after the fault of the direct current line occurs. The direct-current line fault restarting method can meet the requirement for direct-currentline fault restarting, and it can be guaranteed that the cost of stable control measures is minimum.
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...
Claims
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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