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GB/T 47670-2026Integrated gate commutated thyristor (IGCT) valves for voltage-sourced converter HVDC transmission (English PDF)

柔性直流输电用集成门极换流晶闸管（IGCT）阀

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

July 2, 2026

Implementation date

February 1, 2027

Scope

GB/T 47670-2026 is the English-translated version of 柔性直流输电用集成门极换流晶闸管（IGCT）阀.

GB/T 47670-2026 covers integrated gate commutated thyristor (IGCT) valves for voltage-sourced converter HVDC transmission, also called flexible DC transmission.

It specifies the conditions of use, technical requirements, testing, operation and maintenance, and marking, labelling and accompanying documents, along with packaging, transportation and storage.

Appendices describe a modular multilevel converter topology using IGCTs, a typical design example of a buffer circuit and the determination of valve losses. It applies to modular multilevel converter valves using IGCTs at ±100 kV and above, and valves of other voltage levels may follow it by reference.

Issued on 2 July 2026 and applicable from 1 February 2027, it is a new standard and replaces no earlier edition.

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Document preview — GB/T 47670-2026

National Standard of the People's Republic of China

ICS: 29.200
Classification: K 46

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
1 Scope
2 Normative References
3 Terms and Definitions
4 Usage conditions
5 Technical Requirements
6 Experiment
7 Operation and Maintenance
8 Marks, labels, and accompanying documents
Appendix A (Informative) Modular Multilevel Converter Topology Using IGCT
Appendix B (Informative) Typical Design Example of a Buffer Circuit
Appendix C (Informative) Valve Loss Determination
References

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

1 Scope

This document specifies the use of modular multilevel converter valves employing integrated gate commutator thyristors (IGCTs) for flexible DC transmission.

Conditions, technical requirements, testing, operation and maintenance, marking, labeling and accompanying documents, packaging, transportation and storage.

This document applies to modular multilevel converter valves (with integrated gate commutator thyristors) of ±100kV and above that employ integrated gate commutator thyristors (IGCTs).

(Hereinafter referred to as "valve"), valves of other voltage levels shall be used in accordance with this reference.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included. This document.

GB/T 191 Packaging and Storage Graphic Symbols

GB/T 6388 Transport Packaging Receipt and Delivery Marks

GB/T 7284 Framed Wooden Boxes

GB/T 9969 General Rules for Instructions for Use of Industrial Products

GB/T 30425 Water cooling equipment for converter valves in high voltage direct current transmission

GB/T 30553-2023 High-voltage direct current transmission based on voltage source converter

GB/T 33348-2024 Electrical testing of valves in voltage source converters for high voltage direct current transmission

GB/T 34118-2017 Terminology for Voltage Source Converters for High Voltage Direct Current Systems

GB/T 34139-2017 Technical Specification for Flexible DC Transmission Converters

GB/T 37010-2018 Technical Specification for Flexible DC Transmission Converter Valves

GB/T 40865-2021 Terminology for Flexible DC Transmission

DL/T 1071 Specification for Transportation of Large Electrical Items

3 Terms and Definitions

The terms and definitions defined in GB/T 34118-2017, GB/T 30553-2023 and GB/T 40865-2021, as well as the following terms and definitions, apply. In this document.

3.1 Modular multi-level converter (MMC)

The voltage source converter valve on each bridge arm is a multilevel converter composed of several cascaded sub-modules.

3.2 Valve support

The components that provide mechanical support for the valve and electrical insulation to ground potential. [Source: GB/T 34118-2017, 7.25]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 28 pages — is available in the English PDF.

Referenced standards

Normative references

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