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Modular multilevel converter test method, device and system

A modular multi-level and test method technology, which is applied in the direction of measuring devices, instruments, and measuring electronics, can solve the problems of large power supply capacity, high performance requirements, and high test costs, and achieve simple and convenient processes, reduce inrush current, easy-to-achieve effects

Active Publication Date: 2018-04-27
GLOBAL ENERGY INTERCONNECTION RES INST CO LTD +2
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AI Technical Summary

Problems solved by technology

[0005] In order to overcome the disadvantages of large power supply capacity, high performance requirements and high test cost in the prior art for charging the modular multilevel converter to be tested, the present invention provides a testing method for the modular multilevel converter The method, device and system first charge the power modules in the first modular multilevel converter and the second modular multilevel converter respectively, and the charging process includes an uncontrolled rectification charging process and an unlocking charging process; Then adjust the output voltage of the second modular multilevel converter by changing the input number of power modules in the second modular multilevel converter; finally determine the AC according to the output voltage of the second modular multilevel converter The voltage of the load inductance L4 on the bus, and determine whether the second modular multilevel converter is working normally according to the voltage of the load inductance L4, and realize the test of the second modular multilevel converter

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  • Modular multilevel converter test method, device and system

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Embodiment 1

[0054] Embodiment 1 of the present invention provides a testing method for a modular multilevel converter. The specific flow chart of the testing method is as follows figure 1 As shown, it specifically includes the following steps:

[0055] S101: Charging the power modules in the first modular multilevel converter and the second modular multilevel converter respectively, the charging process includes an uncontrolled rectification charging process and an unlocking charging process;

[0056] S102: Adjust the output voltage of the second modular multilevel converter by changing the input number of power modules in the second modular multilevel converter;

[0057] S103: Determine the voltage of the load inductance L4 on the AC bus according to the output voltage of the second modular multilevel converter, and determine whether the second modular multilevel converter works normally according to the voltage of the load inductance L4.

[0058] In the above S101, during the uncontrol...

Embodiment 2

[0068] Based on the same inventive concept, Embodiment 2 of the present invention also provides a testing device for a modular multilevel converter, including a charging power supply, an adjustment module, and a determination module. The above three modules are described below:

[0069] The charging power supply is used to charge the power modules in the first modular multilevel converter and the second modular multilevel converter, and the charging process includes an uncontrolled rectification charging process and an unlocking charging process;

[0070] The adjustment module therein is used to adjust the output voltage of the second modular multilevel converter by changing the input number of power modules in the second modular multilevel converter;

[0071] The determination module therein is used to determine the load inductance on the AC bus connecting the first modular multilevel converter and the second modular multilevel converter according to the output voltage of the ...

Embodiment 3

[0085] Based on the same inventive concept, Embodiment 3 of the present invention also provides a testing system for a modular multilevel converter, including the testing device for a modular multilevel converter provided in Embodiment 2 above and a dragging module, Wherein the dragging module includes a first modular multilevel converter and a second modular multilevel converter;

[0086] Such as Figure 5 As shown, the first modular multilevel converter includes a first voltage source converter located at the upper bridge arm and a second voltage source converter located at the lower bridge arm; the second modular multilevel converter Including the third voltage source converter on the upper bridge arm and the fourth voltage source converter on the lower bridge arm; the connection point A between the first voltage source converter and the second voltage source converter is passed through the AC The bus bar is connected to the connection point B between the third voltage sou...

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Abstract

The invention provides a modular multilevel converter test method, device and system. Power modules in a first modular multilevel converter and a second modular multilevel converter are firstly charged, the output voltage of the second modular multilevel converter is then adjusted, whether the second modular multilevel converter works normally is finally determined, and test on the second modularmultilevel converter is realized. The unlocking charging process adopts a soft start control strategy combining DC chopper and a ramp function, the duty cycle of the first modular multilevel converterand the second modular multilevel converter is gradually reduced through modulation waves in a ramp function form, the current of the power module rises slowly, the impact current during the chargingprocess can be effectively reduced, the process is simple and convenient, realization is easy, and the test cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a testing method, device and system for a modular multilevel converter. Background technique [0002] At present, Voltage Source Converter based High Voltage Direct Current (VSC-HVDC) is widely used in renewable energy grid connection, power supply to passive network, urban grid power supply and asynchronous AC grid interconnection and other occasions, among which , Voltage Source Converter (Voltage Source Converter, VSC) is the core component of VSC-HVDC. At present, the VSC-HVDC that has been put into operation mostly uses two-level converters or three-level converters, but both two-level converters and three-level converters have the following deficiencies: 1) Multiple IGBTs connected in series will Increase the difficulty of static and dynamic voltage equalization of devices; 2) High switching frequency will lead to relatively high switching loss of VSC; 3) Two-lev...

Claims

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Application Information

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IPC IPC(8): G01R31/00
CPCG01R31/00Y02E60/60
Inventor 徐云飞黄杰任西周周哲张淆雨雷晰李卫国乔光尧康伟曾洪涛石秋雨孙海江刘婷婷陈明庆
Owner GLOBAL ENERGY INTERCONNECTION RES INST CO LTD
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