A phase-selection and switch-off method for AC filters in double-circuit DC converter stations on the same tower

Abstract

The present invention discloses a phase-selection and gate-opening method for AC filters in double-circuit DC converter stations on the same tower, which specifically includes the following steps: Step 1: Design software logic scheme; Step 2: Design secondary circuit scheme; Step 3: Convert software commands Corresponding to the physical circuit: Step 4: Realize phase selection and opening. When using the method of the present invention to implement the function of phase selection and opening of the filter in the DC project that has been completed, it can not affect the networking mode of the original device, and make full use of the tripping circuit in the filter bus protection screen, only need to increase the full cut Chassis and physical circuits, while taking into account reliability and economy.

Description

technical field [0001] The invention relates to the technical field of direct current transmission, in particular to a phase selection and opening method for inputting an AC filter of a double-circuit direct current converter station on the same tower. Background technique [0002] The role of the AC filter in the converter station is to filter out the harmonic current generated by the converter and provide part of the fundamental reactive power to the converter. [0003] The cut-off methods of the AC filter mainly include: manual cut-off of the filter by the operator, cut-off of the filter by the action of the filter protection device, and measurement and control devices (double-circuit coordination control host STC, DC station control host DCC, etc.) Satisfy the fixed value and pass through different delay cut filters. Among them, when the AC voltage of the rectifier station detected by the measurement and control device exceeds the maximum overvoltage setting value, the m...

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Problems solved by technology

[0010] For the existing AC filter removal strategy of the converter station, some hardware circuits of the converter station are only used in the phase selection closing circuit of the circuit breaker, and are not used in the phase selection opening circuit. It is relatively weak, and faults such as arcing and re-punching will occur many times during normal switching of the filter, causing the arc extinguishing chamber of the circuit breaker to explode, damaging peripheral equipment, and threatening the safety of on-site operators

[0011] There is no high or low priority in the software of the converter station, and the cut-off command issued by the measurement and control device’s own logic judgment goes to the same secondary circuit exit. It is difficult to satisfy the order that the filter needs to be cut off in a short period of time after passing through the phase selection and opening device. Time limit requirements, resulting in equipment overvoltage damage and grid fluctuations. In order to meet the time limit requirements in the project, it is necessary to set multiple filter cut-off values. After the filter is cut off, the DC power transmission is limited.

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