Method for detecting power consumption of secondary board card of power module based on curve fitting method

Abstract

The invention discloses a method for detecting power consumption of a secondary board card of a power module based on a curve fitting method, and the method comprises the following steps: charging a power module through a power module testing device, and enabling the capacitor voltage of the power module to reach 500V; enabling the power module to last for 5 minutes under the voltage of 500V, so that the power consumption of the secondary board card tends to be constant; and calculating the work done by the secondary board card within 5s by using an energy conservation principle, thereby calculating the power consumption value of the secondary board card of the power module. The power consumption of the voltage-sharing resistor of the power module in the discharge stage can be accurately calculated in a curve fitting mode, so that the power consumption value of the secondary board card of the power module can be accurately calculated; the problems that a traditional power module testing device cannot detect a secondary board card and cannot diagnose power module faults caused by the problem of the secondary board card are solved, the testing means and method of a traditional power module are improved to a certain extent, and problem operation of the power module in a flexible direct-current engineering field is facilitated.

Description

technical field [0001] The present application relates to the technical field of detection of flexible direct current direct current transmission modules, in particular to a method for detecting power consumption of secondary boards of power modules based on a curve fitting method. Background technique [0002] As a new generation of DC transmission technology, flexible DC transmission is similar in structure to HVDC, and is still composed of a converter station and a DC transmission line (usually a DC cable). Voltage Source Converter based High Voltage Direct Current Transmission (VSC-HVDC) technology is a technology based on voltage source converter, self-shutdown device and pulse width modulation (PWM) technology. The basic new power transmission technology has the advantages of being able to supply power to the passive network, no commutation failure, no need for communication between converter stations, and easy to form a multi-terminal DC system. [0003] The rapid de...

AI Technical Summary

Problems solved by technology

[0003] The rapid development of flexible direct current projects in China, such as the Nanao multi-terminal flexible DC transmission demonstration project, the Zhoushan multi-terminal flexible direct current transmission project, the Yunnan Luxi back-to-back direct current transmission project, etc., and the power unit is the core equipment of the flexible direct current direct current transmission converter valve, all adopt semi The MMC topology of the bridge structure, the number of power modules used in each converter station in the project is as many as thousands. After the system is put into operation for a long time, power module failures will inevitably occur, and the modules will be bypassed after failure. , once the number of bypasses is too large, it will directly lead to system shutdown

Images