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MMC system and working method with the ability to quickly start and suppress DC voltage drops

A DC voltage, fast start-up technology, applied in the direction of converting AC power input to DC power output, electrical components, power transmission AC network, etc., can solve problems such as the complex dynamic process of capacitor charging, achieve good scalability, and suppress DC voltage The effect of drop and quick start

Active Publication Date: 2020-04-21
TIANJIN UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The capacitors of MMC are dispersed in each sub-module, and the dynamic process of capacitor charging is more complicated than that of two-level converters.

Method used

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  • MMC system and working method with the ability to quickly start and suppress DC voltage drops
  • MMC system and working method with the ability to quickly start and suppress DC voltage drops
  • MMC system and working method with the ability to quickly start and suppress DC voltage drops

Examples

Experimental program
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Effect test

Embodiment

[0050] Embodiment: a kind of MMC system (see figure 1 ), characterized in that it includes a main controller, a valve base controller VBC and a three-phase six-arm circuit topology; wherein, each of the three phases includes two bridge arms respectively, and each bridge arm It is composed of sub-module SM and bridge arm reactance connected in series; the function of the main controller is the same as that of the two-level voltage source converter VSC, which is to invert and rectify the current through the switch conduction state of the device; the valve base The controller VBC converts the output voltage command value of the MMC system into the number of conduction modules of each bridge arm and decides which sub-modules to conduct, so as to apply trigger pulses to each bridge arm of the MMC system.

[0051] Each bridge arm is composed of not less than one sub-module SM and one bridge arm reactance connected in series (see figure 1 ).

[0052] The sub-module SM is composed o...

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PUM

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Abstract

The invention provides an MMC system with the abilities of quick start and direct current voltage drop suppression, and discloses a modular multi-level converter topological structure. The system comprises a main controller, a valve-based controller VBC and a three-phase six-bridge arm circuit topological structure. A number of MMC systems are combined and applied to a high voltage direct current flexible transmission system. The starting method is simple and easy. Direct current voltage drop in the start process can be effectively suppressed. Quick MMC start is realized. The requirement of a power electronic device is lower. The scalability is great. The MMC system can be applied to overhead line flexible direct current transmission, multi-terminal flexible direct current transmission and other occasions.

Description

[0001] (1) Technical field: [0002] The invention relates to the technical field of power electronic direct current transmission, in particular to a start-up and working method of an MMC (Modular Multilevel Converter, MMC—modular multilevel converter) capable of fast start-up and suppression of direct-current voltage drops. [0003] (two) background technology: [0004] With the development and application of new energy power generation technology, its scale is becoming larger and larger. Therefore, how to realize the long-distance transmission of large-capacity electric power is a very realistic and urgent subject. Flexible DC transmission technology has obvious advantages in realizing large-capacity and long-distance power transmission. [0005] Modular multilevel converter with independent control of active power and reactive power, low output voltage level multi-harmonic content, good output voltage waveform, low switching frequency, highly modular, easy to expand, redund...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M7/483H02J3/36
CPCH02J3/36H02M1/36H02M7/483Y02E60/60
Inventor 岳有军杨立王红君
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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