Testing circuit of half-bridge-structure voltage source current converter and modulation method thereof

Abstract

The invention relates to a testing circuit of a half-bridge-structure voltage source current converter and a modulation method of the testing circuit. The testing circuit comprises a testing power source circuit, a direct current power source, a half-bridge-structure voltage source current converter sub-module 1, an impedance load and a half-bridge-structure voltage source current converter sub-module 2. According to the modulation method, by setting the output voltage of the direct current power source, the voltage of a direct current bus meets the requirement, and a direct current side capacitor of the half-bridge-structure voltage source current converter is charged; after charging is stable, a circuit controller is controlled to output PWM pulse signals, and the half-bridge-structure voltage source current converter operates under different work conditions; by measuring the current and the voltage of the impedance load and simulating various faults of the half-bridge-structure voltage source current converter, the performance and stability of the half-bridge-structure voltage source current converter are checked. By constructing the various work conditions of the half-bridge-structure voltage source current converter, the experimental verification requirements of the design of the half-bridge-structure voltage source current converter and a unit controller control strategy are met.

Description

Technical field: [0001] The invention relates to a test circuit and a modulation method of a converter, and more particularly relates to a test circuit and a modulation method of a voltage source converter with a half-bridge structure. Background technique: [0002] The application of high-power power electronic devices based on turn-off devices is one of the ways to solve the key problems of my country's power grid to improve system stability, increase power transmission capacity, improve reactive power distribution and voltage support. In order to ensure the reliable operation of the device, it is necessary to carry out the corresponding type test on the core component of the device - the valve of the closable device, before it is put into operation. The International Electrotechnical Commission has proposed the test standard for the flexible direct current transmission (voltage-sourced converter based high voltage direct current transmission, VSC-HVDC) converter valve - t...

AI Technical Summary

Problems solved by technology

The core problem of this type of test is how to reproduce the various stresses that may act on the tested product under various operating conditions as realistically as possible in the laboratory with less cost, so as to correctly evaluate the performance of the tested component. Endurance strength

For power electronic devices, due to the interaction between the test circuit and the internal carrier movement process of the device, this type of test is far more complicated than the electrical test of general equipment.

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