A method for automatic switching on and off of DC transmission line fault restart monitoring function

Abstract

The invention discloses an automatic in service and out of service method for restarting a monitoring function of a direct current transmission line fault. The method comprises the steps that 1, a direct current system running mode judging device module is adopted to judge a direct current system is in a networking mode or in an isolated mode; 2, the direct current system is judged to be in the networking mode in the step one, and whether an operator allows the fault to restart the monitoring function to achieve in service and out of service automatically or not is judged through a line fault monitoring function restarting and automatic in service and out of service function judging device module; 3, the operator is judged to allow the fault to restart the monitoring function to achieve in service and out of service automatically in the step two, and bipolar direct current actual transmission power is calculated by adopting a bipolar direct current power calculator module; size comparison between the bipolar direct current actual transmission power and a threshold value is conducted through a power threshold value comparator module; when the bipolar direct current actual transmission power is larger than the threshold value, automatic in service of the monitoring function restarting is conducted; when the bipolar direct current actual transmission power is smaller than the threshold value, automatic out of service of the monitoring function restarting is conducted. The automatic in service and out of service method for restarting the monitoring function of the direct current transmission line fault has the advantages that the operation efficiency of the operator is improved, and the impact of the direct current line fault on safe and stable running of a power system is reduced more effectively.

Description

technical field [0001] The invention relates to a method for automatic switching on and off of a direct current transmission line failure restart monitoring function. Background technique [0002] In the DC project, the restart process after the DC line failure will have an impact on the AC and DC power grid. For large-capacity bipolar DC projects, the power grid will lose the transmission power of the faulty pole during the restart period of the DC line fault or after the restart failure during full-load operation. It takes a certain period of time to enter a stable state after a large power loss. If one pole is still in the process of restarting or restarting fails to lock out of service, and the other pole fails to restart after a circuit failure, the shutdown action time of the stability control system will be prolonged, increasing the risk of system instability. During light load operation, due to the small transmission power of the two poles, even if the two poles suc...

AI Technical Summary

Problems solved by technology

[0003] In the existing DC project, due to the large DC transmission power in the island mode, the line fault restart monitoring function is automatically enabled; in the DC networking mode, the line fault restart monitoring function relies on the manual input of the operator, and does not completely follow the functional design principle It is not conducive to the safe and stable operation of the power grid to switch on and off at the considered power level, especially under the automatic power curve, it may be at different power levels at different times of the day, and the operator cannot switch on and off the function multiple times in a timely and reliable manner

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