Design method and system for high-voltage direct-current transmission valve control system OLT test mode

Abstract

The invention relates to a design method and system for a high-voltage direct-current transmission valve control system OLT test mode. A valve control system comprises a control protection system, a communication and control cabinet and several mutually-independent converter-valve-triggered monitoring cabinets which are sequentially connected, a modulation optical signal and a circuit open-circuittest OLT mode setting switching signal of the control protection system are transmitted through optical fibers; the converter-valve-triggered monitoring cabinets are arranged in parallel; the valve control system comprises a converter valve operation mode switching design module and a converter valve fault monitoring time parameter dynamic condition design module, and the design method comprisesdesigning converter valve operation mode switching and designing the converter valve fault monitoring time parameter dynamic condition. According to the technical scheme, on the basis that functions of original converter valve trigger protection and single-stage testing and the like of the valve control system are not affected, setting of a special operation mode aiming at the above test operationcondition is achieved, misjudgement of the converter valve operation state is prevented from occurring under the operation condition, and the debugging and testing efficiency of the station control system is improved.

Description

technical field [0001] The invention relates to the field of test mode design of a high-voltage direct current transmission system, in particular to a design method and system for an OLT test mode of a high-voltage direct current transmission valve control system. Background technique [0002] Open Line Tests (OLT), also known as no-load pressurization test, is an extremely important station system commissioning test in the construction of converter stations of UHVDC power transmission projects. The test mainly involves the DC pole control part, the DC station control part, the valve control system (VBE), the converter transformer, the converter valve, the DC filter, the DC line and the operator control system and other parts. Its main test purposes include: checking whether the DC voltage control in the pole control function can work correctly; checking whether the valve base electronic equipment and the converter valve trigger coordination function are correct; checking wh...

AI Technical Summary

Problems solved by technology

After the analysis of the test results, it is preliminarily judged that the cause of the failure is that the converter valves, transmission lines and other primary circuits of different technical routes in the OLT test have unstable operating conditions during the test, which caused VBE to misjudge the operating status of the converter valve.

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