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

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 universal experimental platform of a modular multilevel converter that can be expanded flexibly. Background technique: [0002] The modular multi-level converter is a new type of converter that has emerged in recent years and is suitable for the field of high-voltage flexible DC transmission technology. Added options for flexible DC applications. [0003] Each bridge arm of the modular multi-level has the same number of sub-modules in series with the bridge arm reactance. By controlling the input and withdrawal of the sub-modules, the output ground voltage is close to the sinusoidal AC voltage, thereby forming a stable operating point. At the same time, through the complementation of the input capacitors of the upper and lower bridge arms of the same phase unit, a stable DC voltage is formed, thus realizing the stable operation of the system. [0004] A modular multi-level c...

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

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