Online detection method for optical fiber link of modular multilevel converter control system

Abstract

The invention discloses an online detection method for an optical fiber link of a modular multilevel converter control system. The modular multilevel converter control system comprises a converter control system optical transceiver module, a sub-module control panel optical transceiver module and an optical fiber connected between the converter control system optical transceiver module and the sub-module control panel optical transceiver module. Receiving optical power detection circuits are configured on an optical transceiver module of a converter control system and an optical transceiver module of a sub-module control panel, and receiving optical power detection is carried out on an uplink optical fiber link and a downlink optical fiber link respectively. The online detection method comprises the following steps: summarizing received optical power information of all uplink and downlink optical fiber links, diagnosing and analyzing data according to a communication margin detection strategy and / or an optical fiber attenuation detection strategy, and early warning an unhealthy optical fiber link channel in advance. The online detection method can be used to solve a health diagnosis problem of the optical fiber link in a simplest, reliable and comprehensive mode.

Description

technical field [0001] The invention relates to an online detection method of an optical fiber link, in particular to the optical fiber link detection of a modular multilevel converter control system. Background technique [0002] High-voltage flexible DC transmission system is suitable for long-distance power transmission, wind power grid connection, submarine power transmission and other applications. Compared with AC transmission and traditional DC transmission, it has its unique advantages. In the high-voltage flexible DC transmission system based on modular multilevel converters, the converter valve is composed of many sub-modules (SM) cascaded, and the number of cascaded sub-modules in one bridge arm can reach hundreds, and the three-phase six bridges The number of sub-modules of the arm can reach thousands, and the higher the voltage level, the more the number of sub-modules. Each sub-module has a sub-module control board (SMC) for control and monitoring. Many sub-mo...

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Problems solved by technology

[0003] The current detection method is to manually perform spot checks or full inspections of optical fibers during power outage maintenance at the converter station. If the attenuation of the optical fiber is found to be too large, the spare core will be replaced, and if the optical transceiver module is found to be abnormal, the spare parts will be replaced. The manual detection process is not only time-consuming and labor-intensive , and there is a risk of secondary damage in the process of fiber detection, plugging and unplugging. A safer, more efficient and comprehensive fiber link detection method is urgently needed to conduct online health diagnosis of all fiber links and provide early warning during maintenance. It not only greatly improves the maintenance efficiency, but also avoids faulty operation of links with insufficient margin, ensuring the safe and stable operation of the system

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