MMC converter valve control device based on flexible DC power transmission and control method

Abstract

The invention provides an MMC converter valve control device based on a flexible DC power transmission and a control method. The MMC converter valve control device comprises three-stage control systems, and the three-stage control systems respectively are a first-stage control system, a second-stage control system and a third-stage control system; the first-stage control system comprises a main-control box A, an interface box A, a main-control box B and an interface box B; the second-stage control system comprises an operational box A, an operational box B and a recording and broadcasting box; and the third-stage control system comprises a plurality of pulse boxes. The MMC converter valve control device is advantageous in that, as follows, the converter valve control device has the excellent communication and operation abilities and can very rapidly control working states of a large number of sub modules SMs; furthermore, the converter valve control device has the advantage of flexible configuration and can assemble boxes flexibly according to different engineering needs; and the converter valve control device has the advantages of good expansibility and high reliability.

Description

technical field [0001] The invention belongs to the technical field of flexible direct current transmission, and in particular relates to an MMC converter valve control device and a control method based on flexible direct current transmission. Background technique [0002] Modular Multilevel Converter (MMC) flexible DC transmission is a high-voltage DC transmission technology that has emerged in recent years, because it does not require reactive power compensation and grid support commutation, has small switching losses, and is convenient for capacity upgrades. The advantages of low harmonic content in the output voltage have been more and more widely used. [0003] The schematic topology diagram of the modular multilevel converter is as follows: figure 1 As shown, three phase units are connected in parallel to form a DC bus, and each phase unit includes two bridge arms, namely the upper bridge arm and the lower bridge arm. Therefore, each converter includes 6 bridge arms; ...

AI Technical Summary

Problems solved by technology

Therefore, the control device needs to control about 2,000 sub-modules SM at the same time in one control cycle. According to the system requirements, the control cycle is often only tens to hundreds of milliseconds. High requirements, and traditional controllers are difficult to meet the above requirements

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