Online monitoring method and system for MMC flexible DC distribution network converter valve submodule

Abstract

The invention provides an online monitoring method and system for an MMC flexible DC distribution network converter valve sub-module, and the method comprises the steps: determining the working state of the converter valve sub-module in any control period, wherein the working state comprises a charging state, a discharging state or a cutting-off state; if the converter valve sub-module is in the charging state or the discharging state, judging the health state of the converter valve sub-module in a first mode; and if the converter valve sub-module is in the cut-off state, judging the health state of the converter valve sub-module in a second mode, wherein the first mode is different from the second mode. Therefore, the health state of the converter valve sub-module can be judged on line when the converter valve sub-module works.

Description

Technical field [0001] The present invention relates to the field of high voltage DC transmission, and more particularly to an online monitoring method and system of a MMC flexible DC distribution network switching valve module. Background technique [0002] Based on the flexible DC transmission engineering of MMC (modular multi-level technology), the converter valve is composed of a plurality of bridge arms, and each bridge arm is constructed in series by 100 commutation valve modules. The current flexible DC transmission project cannot be monitored online monitoring of the capacitance value and static load of the commutation valve sub-module. When the converter valve is shut down, the capacitance to each shift valve module is performed by manual detection. Values ​​and static loads are tested. Since each converter valve sub-module contains 1 set capacitance, this will result in a lot of capacitance of the converter valve, and manual detection will result in huge workload, and c...

AI Technical Summary

Problems solved by technology

The current flexible HVDC project cannot monitor the capacitance value and static load of the converter valve sub-module online. Values ​​and static loads are tested

Since each converter valve sub-module contains a set of capacitors, this will lead to a large number of capacitors in the converter valve, manual detection will lead to a huge workload, and the capacitance value and capacitor value of the converter valve sub-module cannot be obtained in time. Static load, so that the health status of the converter valve sub-module cannot be monitored in time

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