Converter valve voltage-sharing state consistency statistics method

Abstract

The invention discloses a converter valve voltage-sharing state consistency statistics method, which includes the following steps of: configuring a register array which is used for storing deviation data for each thyristor valve level of the converter valve in a converter valve control unit, and configuring a storage region for storing the deviation data with time mark information; configuring a high speed processor in the converter valve control unit as a key core device; designing a deviation data screening algorithm in the converter valve control unit used for screening the data with large deviation from state signals fed back from the each thyristor control unit of the converter valve, and classifying and storing the data; designing and providing an interface for reading the deviation data in the converter valve control unit, the interface being used for on-line monitoring the deviation data or reading the data and off-line analyzing the data; and finding the thyristor valve level with large deviation accumulation quantity from a data statistics result, analyzing a specific location in a thyristor valve voltage-sharing loop where the difference exists, thereby pre-judging the case that this type of thyristor valve level may have fault, and taking the pre-judgment as a reference basis of device replacement and optimization design.

Description

technical field [0001] The invention belongs to the field of high-power electric power electronics, and in particular relates to a statistical method for the consistency of the pressure equalization state of a converter valve. Background technique [0002] High voltage direct current transmission (High Voltage Direction Current, HVDC) is the most important, the most traditional, and the most active technology in the application of power electronics technology. As the core primary equipment in the HVDC transmission project, the converter valve's working performance is directly related to the stability of the HVDC transmission operation. The control function of the converter valve under various operating conditions is completed by the converter valve control system. The converter valve control system is mainly composed of a DC control protection system, a converter valve control unit (ValveControlUnit, VCU) and a thyristor control unit (ThyristorControlUnit, TCU). Among them...

AI Technical Summary

Problems solved by technology

[0003] The converter valve is a complex system composed of multiple thyristor stages, reactors and cooling equipment composed of thyristors and their resistance-capacitance circuits. After long-term operation, failures may occur due to performance aging. Influenced by subtle differences in capacitor circuit parameters, there are also subtle differences in the voltage equalization consistency, which will reduce the service life of some thyristor-level equipment under long-term high-voltage operating conditions, and in severe cases, the DC system will be shut down due to multiple thyristor-level failures risk, causing adverse effects on the safe and stable operation of the DC system

During the operation of DC projects in the past, since the monitoring method for the operation status of all thyristor stages of the converter valve is only to monitor the presence or absence of state feedback signals roughly, the differences between different thyristor stages are often ignored

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