Loss measuring system and method for converter valve based on twin trawling experiment

Abstract

The invention provides a loss test system and method for a flexible DC transmission converter valve based on a valve section twin trawling test platform, and the system comprises a valve section twintrawling module, a loss calculation module and a current control module, wherein the current control module receives a real-time current value of the valve section twin trawling module, and outputs acontrol signal to the valve section twin trawling module to generate a stable running current in the twin trawling module; and the loss calculation module receives the voltage and current measurementdata of the valve section twin trawling module, and calculates the loss of the test valve section and the accompanying test valve section in the valve section twin trawling module. The total loss in the valve section twin trawling platform is provided by the DC power outputted by the supplemental power supply, so that the power consumed by the valve section twin trawling platform can be accuratelycalculated, and the problem that the loss of power is difficult to accurately measure by the AC power supply mode is avoided. In addition, active loss of the reactor at multiple frequencies is takeninto account for the loss generated by the load reactor in the loop, which can further ensure the accurate loss calculation of the converter valve.

Description

technical field [0001] The invention relates to the technical field of a high-voltage high-power power electronic converter testing method, in particular to a converter valve loss measurement system and method based on a drag test. Background technique [0002] The flexible HVDC converter valve usually adopts a voltage source converter valve with a modular multi-level topology, in which the power module is usually a fully-controlled power device (IGBT, IEGT) whose gate can be turned off. The flexible HVDC technology is A new type of power transmission technology, compared with the traditional DC transmission technology, has the advantages of being able to connect weak AC systems, supply power to passive networks, and improve the penetration power of wind power and other new energy sources connected to the grid. With the continuous development of flexible DC converter technology at home and abroad in recent years, the voltage level and transmission capacity of the converter v...

AI Technical Summary

Problems solved by technology

However, the modular multilevel converter is mainly limited by the size and modular structure, and the valve section cannot be installed in a closed cabinet, and the voltage level of the valve section of the test product is high, and there are many experimental items. The valve section test platform is usually A site or valve hall is specially set up for related tests, and the platform should consider the compatibility of various test items, so the system and method described in this invention cannot be applied to the MMC topology

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