GB/T 20996.2-2020Performance of high-voltage direct current (HVDC) systems with line-commutated converters - Part 2: Faults and switching (English PDF)

1 Scope

This part of GB/T 20996 is a guidance document on the transient performance and fault protection requirements of HVDC systems; it discusses the three-phase bridge

The transient performance of the fault and operation of the high-voltage DC system at both ends of the 12-pulse (dynamic) converter unit connected by the type (dual circuit) connection does not involve multi-terminal high

DC transmission system, but the parallel converter and parallel circuit included in the two-end system are discussed; it is assumed that the converter uses thyristor valves

As the bridge arm, a gapless metal oxide arrester is used for insulation coordination, and the power can be transmitted in both directions: Two poles are not considered in this section

Pipe valve:

This section only involves power grid commutated converters, including converters with capacitor commutated circuit structures: In IEC 60146-1-1, IEC 60146-1-

2 and IEC 60146-1-31) give the general requirements for power grid commutated semiconductor converters: This section does not consider voltage source converters:

GB/T 20996 is composed of three parts: steady state, fault and operation, and dynamic: In the process of formulation and writing, three

Duplication of part of the content: Therefore, when the user is preparing to compile the specifications of the two-terminal HVDC system, the entire content of the three parts should be referred to:

For each component in the system, pay attention to the difference between system performance specifications and equipment design specifications: This section does not provide technical specifications for equipment

Make provisions with test requirements, but focus on those technical requirements that affect system performance: This section also does not include detailed seismic performance requirements:

In addition, different HVDC systems may have many differences, which are not discussed in detail in this section: Therefore, this section should not directly

Used as a technical specification for a specific engineering project: However, it can be used as a basis to compile specific transmission systems to meet actual system requirements

Technical specifications: The content involved in this section does not distinguish between the responsibilities of the user and the manufacturer:

Since the equipment of each DC project is usually designed and purchased independently, considering the impact on the performance of the HVDC system, this section includes DC Lines, grounding pole lines and grounding poles:

For ease of use, this section assumes that the HVDC converter station includes converters and valve halls, reactors, filters, reactive power compensation devices, control

Control system, monitoring system, measuring device, protection device and auxiliary system: This part does not include those other than AC filters and reactive power compensation devices

Other communication equipment:

2 Normative references

The following documents are indispensable for the application of this document: For dated reference documents, only the dated version applies to this article

Pieces: For undated references, the latest version (including all amendments) applies to this document:

IEC 60071-1 Insulation coordination Part 1: Terms, definitions, principles and rules (Insulationco-ordination-Part 1:

Terms,Definitions,principlesandrules)

IEC 60146-1-1 General requirements for semiconductor converters and grid-commutated converters Part 1-1: Basic requirements specification (Semi- conductorconverters-Generalrequirementsandlinecommutatedconverters-Part 1-1:Specification ofbasicrequirements)

1) IEC 60146-1-3 has been abolished and is covered by IEC 61378 series and IEC /IEEE60076-57-129:

IEC 60146-1-2 General requirements for semiconductor converters and grid-commutated converters Part 1-2: Application guidelines (Semiconductor converters-Generalrequirementsandlinecommutatedconverters-Part 1-2:Applicationguide)

IEC TR60146-1-31) General requirements for semiconductor converters and grid-commutated converters Part 1-3: Transformers and reactors

GB/T 37404 | GB/T 31487.3 | GB/T 3859.1 | GB/T 20995 | GB/T 20990.1 | GB/T 20996.3 | […]