Method for preventing over voltage of inversion-side reverse polar wire of high voltage direct current power transmission system
A power transmission system, high-voltage direct current technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve problems such as reverse voltage of thyristor valves, damage to converter valve equipment, etc.
Inactive Publication Date: 2009-12-09
北京网联直流工程技术有限公司
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The inverter side generally puts into the bypass pair when it is locked. Figure 1 As shown, 1, 4, 2, 5, 3, and 6 can all be selected as the bypass pair. After the bypass pair is switched on, the control system always sends a trigger pulse to the bypass pair. According to the conduction principle of the thyristor, the thyristor has a trigger Pulse and positive pressure can be turned on, therefore, after the rectifier side is blocked, it is equivalent to the open circuit of the thyristor on the inverter side for the inverter side, after the bypass pair is put into the inverter side, due to the peak rectification of the valve The thyristor valve on the inverter side will have a reverse voltage. If the reverse overvoltage is not suppressed, it will cause damage to the converter valve equipment.
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[0009] In order to avoid the reverse overvoltage of the DC pole line on the inverter side, a blocking strategy of delaying the bypass pair can be adopted. The specific implementation method is as follows:
[0010] 1. After the inverter side starts the operation of the blocking converter, it issues an instruction to jump the AC incoming switch K.
[0011] 2. After 100ms, the inverter side issues a command to switch to the bypass pair. Usually, the time for the tripping of the AC incoming line switch is 40ms, so when the inverter side issues the bypass pair command, the AC incoming line switch has tripped and the AC power supply has been isolated.
[0012] 3. As a safety measure, monitor the DC pole line voltage at the same time, and issue a 10ms bypass pair blocking command when the reverse value is greater than the reference value, so as to prevent the pole line reverse voltage when the AC incoming line switch is not tripped.
[0013] 4. Switch the bypass pair for 2s, and the...
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The invention relates to a method for preventing over voltage of an inversion-side reverse polar wire of a high voltage direct current power transmission system, which adopts a special control method to make the trigger pulse of an inversion-side control system matched with the time sequence of an alternating current incoming line switch of an inversion-side converter transformer so as to achieve the effect of preventing the over voltage of the inversion-side reverse polar wire. More specifically, when an inversion-side converter valve of the direct current power transmission system is switched to a bypass for lockout and the reverse voltage of a direct current polar wire exceeds a set value, the control system sends out a command of switching to the bypass for lockout so as to prevent the reverse voltage of the direct current polar wire from further rising.
Description
technical field [0001] The invention relates to a method for preventing the overvoltage of the reverse polar line on the inverter side of a high-voltage direct current transmission system. The method can avoid high reverse overvoltage on the inverter side when the direct current transmission system is blocked, causing electrical The insulation of the device is damaged. This method improves the blocking sequence when the inverter side of the DC transmission system is blocked, and combines the measured DC voltage value, and compares the voltage value with the set directional voltage allowable value, so as to reliably judge that the inverter side stops switching when the inverter side is blocked. The correct timing can effectively avoid the overvoltage of the reverse pole line when the inverter side of the DC transmission system is blocked. Background technique [0002] When the DC transmission system is in normal operation, the DC voltage potential difference between the rect...
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IPC IPC(8): H02J3/00
Inventor 石岩张民马玉龙
Owner 北京网联直流工程技术有限公司