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Flexibly-expanded general experiment platform for modular multi-level current converter

A modular multi-level, experimental platform technology, applied to output power conversion devices, AC power input conversion to DC power output, instruments, etc., can solve the problem of inability to simulate DC transmission systems, uneconomical, and inflexible upgrades and other issues, to achieve the effect of strong scalability, saving floor space and investment

Active Publication Date: 2011-11-23
CHINA ELECTRIC POWER RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common feature of the above prototypes is that they can only simulate modular multilevel converters, but cannot simulate DC transmission systems, let alone perform flexible upgrades. Reasonable simulation ratios can be obtained for different projects, and for scientific research institutes such as universities , it is unrealistic and economical to build an experimental platform for each application field

Method used

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  • Flexibly-expanded general experiment platform for modular multi-level current converter
  • Flexibly-expanded general experiment platform for modular multi-level current converter
  • Flexibly-expanded general experiment platform for modular multi-level current converter

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Embodiment Construction

[0035] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0036] figure 1 It is a structural diagram of a modular multilevel converter. A modular multilevel converter is composed of three-phase six bridge arms, and each phase unit is divided into upper and lower bridge arms; one side of the bridge arm is connected to the AC output terminal, and the other side is connected to the DC output terminal; Each bridge arm is composed of the same number of sub-modules connected in series with the bridge-arm reactance, and the bridge-arm reactance can be centrally connected between the converter valve and the AC output end, or can be distributed and connected in series with the sub-modules. In this embodiment, an AC incoming switch is provided between the analog reactors of the commutation side I and II and the converter cabinet; a fuse is provided on the AC incoming switch and the brid...

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Abstract

The invention discloses a flexibly-expanded general experiment platform for a modular multi-level current converter. The platform comprises a current conversion side I and a current conversion side II which are symmetrically arranged, wherein the current conversion side I comprises a switch cabinet, a voltage regulator, a transformer, an analogue reactor and a current converter cabinet which are sequentially connected; the current conversion side II comprises a switch cabinet, a voltage regulator, a transformer, an analogue reactor and a current converter cabinet which are sequentially connected; and the current conversion side I and the current conversion side II are connected through a lead. The invention provides an experiment platform for theoretical research and engineering simulation for a flexible direct-current transmission system / static reactive compensation device using the modular multi-level current converter, and meets the needs for the engineering simulation tests of different scales and different levels; moreover, the boosting as well as capacity expansion of the experiment platform can be finished by changing a reference value of a control system and increasing the number of sub-modules in serial connection without adding equipment; and the general experiment platform has the characteristic of strong expandability, and saves the floor space and investment of equipment.

Description

Technical field: [0001] The invention relates to the field of power electronics, in particular to a flexible and expandable universal experimental platform for modularized multilevel converters. Background technique: [0002] The modular multi-level converter is a brand-new converter suitable for the field of high-voltage flexible DC transmission technology that has emerged in recent years. Its appearance has broken the situation that the original two-level topology monopolizes the flexible DC market. Added options for flexible DC applications. [0003] Each bridge arm of the modular multi-level has the same number of sub-modules connected in series with the bridge arm reactance. By controlling the input and exit of the sub-modules, the output ground voltage is close to the sinusoidal AC voltage, thus forming a stable operating point. At the same time, through the complementary input capacitors of the upper and lower bridge arms of the same phase unit, a stable DC voltage i...

Claims

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Application Information

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IPC IPC(8): G01R1/04G01R31/00
CPCH02M2007/4835H02M7/4835
Inventor 刘栋王姗姗贺之渊赵岩李文津
Owner CHINA ELECTRIC POWER RES INST
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