Last circuit breaker backup protection method based on evidence theory
A technology of the last circuit breaker and evidence theory, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve the problems of unreasonable action consequences, potential safety hazards, loss of the protection function of the last circuit breaker, etc., to achieve rapid response actions and improve safety. and stability effect
Inactive Publication Date: 2015-02-25
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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[0003] The final circuit breaker protection in conventional DC will have unreasonable action consequences under specific working conditions, while the final circuit breaker protection in UHV DC projects currently adopts a setting method based on the energy consumption of the arrester, because the protection only collects high-end The voltage value of the incoming line area of the converter transformer and the current value of the arrester will be lost if the high-end converter transformer is out of maintenance and there is a complete pole plus a 1 / 2 pole operation mode or two 1 / 2 pole operation modes Pole's last circuit breaker protection function, which poses a safety hazard
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[0021] attached figure 1 The setting logic protected by the present invention includes three sub-logics: one is the last circuit breaker protection action criterion based on the AC field switching value and operating parameters; one is the last circuit breaker protection action criterion based on the arrester energy integral; one is Criterion for last circuit breaker protection action based on arrester energy release. The three logics are connected in parallel, judge independently, give corresponding judgment signals, and finally select each judgment signal according to the operation mode of the DC system.
[0022] In this invention, the reference value of the system should be set before starting the protection. The voltage reference value in logic 2 and logic 3 is set to 460kV, the current reference value is set to 20.0A, the trip reference value is set to 3.1MJ, and the voltage constant in logic 2 It is set to 0.595MV, and the cooling constant of the arrester in Logic 3 is ...
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The invention provides a last circuit breaker backup protection method based on the evidence theory. High-end converter transformer operation state information is obtained by means of wireless communication tools such as Zigbee, operation logic is adjusted according to the work condition of the high-end converter transformer, and a scheme, considering the special work condition of the high-end converter transformer, of protection and setting of a last circuit breaker is built on the basis of the evidence theory. The method eliminates hidden risks of existing last circuit breaker protection schemes, and last circuit breaker protection can quickly and correctly respond to a fault.
Description
technical field [0001] The present invention relates to a backup protection method for the last circuit breaker based on evidence theory, in particular to a backup protection method for the last circuit breaker of UHV DC transmission system, especially for the case where a complete pole plus a 1 / 2 pole is in operation when the high-end converter transformer withdraws from maintenance. mode or two 1 / 2-pole operating modes as the last circuit breaker protection scheme. Background technique [0002] Finally, the circuit breaker protection is an important protection for the DC engineering inverter station. When the inverter side loses the AC power supply, if the DC system fails to be blocked in time, the DC system will continue to charge a large number of reactive power compensation equipment connected to the commutation bus, which will cause serious temporary overvoltage, which will damage valves, arresters, Influenced by the commutation busbar, etc. In order to prevent this ...
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Inventor 李明黎小林李岩黄莹刘涛田凌寻斌斌李婧靓
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD