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Cascaded Communication Architecture for Modular Multilevel Converter Control Systems

A modular multi-level, multi-level commutation technology, applied in the direction of electrical program control, comprehensive factory control, comprehensive factory control, etc., to achieve the effect of reducing design and implementation costs

Active Publication Date: 2018-02-16
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a cascaded communication architecture suitable for a modular multilevel converter control system. A reliable way to solve the expansion problem caused by the number of sub-modules exceeding the maximum control number of a converter control device

Method used

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  • Cascaded Communication Architecture for Modular Multilevel Converter Control Systems

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Embodiment 1

[0013] see figure 1 , which is suitable for the cascaded communication architecture of the modular multilevel converter control system. A bridge arm of the multilevel converter valve is composed of N sub-modules cascaded; it also includes the converter control device; a converter The maximum number of sub-modules that can be controlled by the converter control device is Q, Q>N; the N cascaded sub-modules of one bridge arm of the multi-level converter valve are M segments in sequence; the converter control There are M devices; one converter control device is used to connect and control the sub-modules of one segment; M converter control devices are also used to cascade the M segments of the same bridge arm; the cascade method It is: two adjacent converter control devices are cascaded through optical fiber communication or electrical communication. Each converter control device has at least one pair of receiving ports R1 and R2 for interconnecting with adjacent converter contro...

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Abstract

The invention discloses a cascaded communication architecture suitable for a modularized multi-level converter control system. The maximum number of sub-modules that can be controlled by one converter control device is Q, where Q>N; The N cascaded sub-modules of a bridge arm of the flow valve are M segments in sequence; the converter control device is M; one converter control device is used to connect and control the sub-modules of a segment ; M converter control devices are also used to cascade M segments of the same bridge arm; the cascading method is: two adjacent converter control devices are cascaded through optical fiber communication or electrical communication . The present invention coordinates and controls a single bridge arm through one or more converter control devices, and through the cascade connection between the converter control devices, information such as the number of faulty modules and emergency fault status is shared among multiple control devices to realize a single bridge arm. The coordinated control of many sub-modules of the bridge arm facilitates system expansion and reduces the complexity of system software and hardware design.

Description

technical field [0001] The invention relates to the communication field of a converter control system, in particular to a cascade communication architecture suitable for a modular multilevel converter control system. Background technique [0002] High-voltage flexible DC transmission systems are especially suitable for long-distance power transmission, wind power grid integration, submarine power transmission and other applications. Compared with AC transmission and traditional DC transmission, it has its unique advantages. In the high-voltage flexible DC transmission system based on modular multilevel converters, the converter valve is composed of many sub-modules (SM) cascaded, and the number of cascaded sub-modules in one bridge arm can reach hundreds, six for three-phase The number of sub-modules of the bridge arm can reach thousands, and the higher the voltage level, the more the number of sub-modules. Each sub-module has a sub-module control and protection unit (SMC) ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05B19/418
CPCY02P90/02
Inventor 冯亚东李乐乐陈勇汪涛陈永奎张茂强
Owner NR ELECTRIC CO LTD
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