GB/T 20996.1-2020Performance of high-voltage direct current (HVDC) systems with line-commutated converters - Part 1: Steady-state conditions (English PDF)

Foreword

GB/T 20996 "Performance of HVDC System Using Grid Commutation Converter" is divided into 3 parts:

--- Part 1: Steady state;

--- Part 2: Failure and operation;

--- Part 3: Dynamics:

This part is Part 1 of GB/T 20996:

This section was drafted in accordance with the rules given in GB/T 1:1-2009:

This part replaces GB /Z 20996:1-2007 "Performance of High Voltage Direct Current System Part 1: Steady State", and is compatible with GB /Z 20996:1-2007

The main technical changes compared to:2007 are as follows:

---Change the "General Provisions" and "Overview of HVDC System Steady-State Performance Specifications" to "Scope" and "Normative Reference Documents" (see Chapter 1,

Chapter 2, Chapter 1 and Chapter 2 of the:2007 edition);

--- "Scope" has been added "This part only includes power grid commutated converters, including converters with capacitor commutated circuit structure:"

Grid commutation semiconductance of voltage source converters given in IEC 60146-1-1, IEC TR60146-1-2 and IEC 60146-1-3

General requirements of the inverter: "(See Chapter 1);

--- Added "Terms and Definitions" (see Chapter 3);

---Added the use of single-pole metal loop HVDC system and the expression of the influence of fault current on nearby substation transformers

(See 4:4);

---Added the regulations on the wiring mode of fixed bipolar high voltage DC system, and revised Figure 8 (see 4:5);

---Added the expression about the influence of fault current in the bipolar metal loop HVDC system on the transformers of nearby substations (see 4:6);

---Modified the regulations of two 12-pulse (moving) inverters per pole, and added Figure 10 and Figure 11 (see 4:7,:2007 edition 3:7);

---Added the table about DC switch, smoothing reactor and converter transformer with third winding in "Arrangement of converter transformer"

Described (see 4:8);

---Added the provisions of "Series Capacitor Compensated High Voltage DC System" and "LCC/VSC Hybrid Bipolar System" (see 4:10, 4:11);

--- Change the suspended paragraphs in 5:1, 6:2, 7:4, 11:2, 11:5, 12:2, 15:2, 20:2 of the:2007 edition to "Overview", and the following paragraphs

Serial number extension (see 6:1, 7:2, 8:4, 12:2, 12:5, 13:2, 16:2, 21:2, 5:1, 6:2, 7:4, 11:2, 11:5,

12:2, 15:2, 20:2);

---Added the description of the relationship between reactive power and overload in "overload" (see 7:1 paragraph 5);

--- Modify the "effective value" to "root mean square value" [see 9:2:1, formula (9), formula (14), 18:2:3 and 18:3:4, 8:2:1 of the:2007 edition

16:3, 17:2:3 and 17:3:4];

---Increase the "short-term voltage change range" and "voltage change in emergency" in the AC steady-state voltage range (see 9:2:2:2 and

9:2:2:3);

--- Added "HVDC design for series capacitance compensation" and related content (see 10:3);

--- Modify the frequency "to 100kHz" to "to the 49th harmonic of the fundamental frequency" [see 1) and 3) of 11:2:2,:2007 edition

10:2:2) a), c)];

---Modified the "Overview" of "Reliability" (see 12:1, 11:1 of the:2007 edition);

---Modified the provisions on "out of service" in "reliability" (see 12:2, 11:2 of:2007 edition);

---Added "capacity" and related content (see 12:3);

--- Added "Terms of Outage Time", and included "cycle hours" into this article (see 12:4,:2007 edition 11:3);

--- Delete the "basic power level" related content (see 11:4 of the:2007 edition);

---Modified the calculation formula in "energy unavailability rate" (see 12:5, 11:5 in:2007 edition);

---Modified the explanation of the control structure of the HVDC system, and revised Figure 20 (see 13:2:1,:2007 edition 12:2 and Figure 16);

---Modified the functional requirements of "Inverter trigger control" (see 13:2:2, 12:2:1 of the:2007 edition);

---Added the description of the basic control function of "Pole Control" and Figure 21c) and related content (see 13:2:3, 12:2:3 of the:2007 edition

And Figure 17);

---Added the "protection system" of the HVDC system (see 13:6);

---Modified the content of "Microwave" (see 14:4, 13:4 of:2007 edition);

--- Modify the "DC reactor" in the full text to "Smoothing reactor", and add a description in Figure 1 to Figure 26;

---Added the description of the requirements and characteristics of the optical fiber communication system of the converter station (see 14:6);

--- Added the content of signal transmission format (see 14:7);

---Added "e) HVDC transmission line protection; f) Power system safety control:" and "The performance requirements of the communication system will depend on

Specific requirements for high-voltage DC control systems, remote control facilities, etc: Because of these different HVDC transmission schemes

There is a big difference between them, and the communication system specifications should be determined through detailed analysis of the specific HVDC transmission system: "(see

14:8);

---Added the expression of combining multiple communication channels (see 14:9);

---Added the content that the battery pack needs to consider and stipulate "temperature conditions" and "ventilation requirements", and deleted the uninterruptible power supply requirements

The content of voltage tolerance (see 15:4, 14:4 in:2007 edition);

---Added the design and installation of noise reduction devices for dry smoothing reactors (see 16:2:4);

---Modified the content of "AC filter reactor" (see 16:2:5, 15:2:4 of the:2007 edition);

---Added the example diagram of "AC harmonic filter connected to AC feeder of bipolar high voltage DC system" (see Figure 22,:2007 edition

Figure 18);

---Added the description of the reasons and characteristics of the active filter and the circuit diagrams of different types of filters (see 17:2 and Figure 23,

16:2 and Figure 19 of the:2007 edition);

---Added the relevant content of the DC line path selection in the "DC filter" (see 18:1:7);

---Modified the harmonic interference current calculation formula (see 18:3:4, 17:3:4 in:2007 edition);

---Modified "noise" in power line carrier interference and radio frequency interference to "interference" (see Chapter 19, Chapter 20,:2007 edition

Chapter 18 and Chapter 19);

---Added "It should be considered that the cost of a wideband PLC filter is significantly higher than that of a narrowband PLC filter: In particular, 20kHz~

The cost of the 50kHz lower frequency filter is significantly higher than the higher frequency PLC filter: "(See 19:2);

---Added the "Overview" of "Radio Frequency Interference" as an article (see 20:1);

---Added AC corona and DC corona influencing factor analysis of AC high voltage switchyard of converter station (see 20:2:1);

---Modified the content of "radio interference propagation" (see 20:2:2, 19:1:2 of the:2007 edition);

--- Added "RFI features" and related content (see 20:2:3);

---Modified the content of "Radio Frequency Interference Performance Specification" (see 20:3, 19:2 in:2007 edition);

--- Deleted part of the illustration of "HVDC system expansion method" (see Figure 26, Figure 21 of the:2007 edition);

---Added Appendix A and references:

The translation method used in this part is equivalent to the adoption of IEC TR60919-1:2020 ``Performance of High Voltage DC Systems Using Grid Commutation Converters''

Energy Part 1: Steady State:

The Chinese documents that have a consistent correspondence with the international documents cited in this section are as follows:

---GB/T 13498 Terminology for High Voltage Direct Current Transmission (GB/T 13498-2017, IEC 60633:2015, MOD)

This part was proposed by China Electrical Equipment Industry Association:

This part is under the jurisdiction of the National Power Electronic System and Equipment Standardization Technical Committee (SAC/TC60):

Drafting organizations of this section: China Electric Power Research Institute Co:, Ltd:, China Southern Power Grid Research Institute Co:, Ltd:, Xi'an High Voltage

Research Institute Co:, Ltd:, Xi'an Power Electronics Technology Research Institute, Tsinghua University, Global Energy Internet Research Institute Co:, Ltd:, Xi'an West

Electric Power System Co:, Ltd:, Nanjing Nanrui Relay Electric Co:, Ltd:, State Grid Economic and Technical Research Institute Co:, Ltd:, China Southern Power Grid Co:, Ltd:

Responsible company EHV Transmission Company, Xu Ji Electric Co:, Ltd:, Xi'an Duanyi Technology Co:, Ltd:, Pinggao Group Co:, Ltd:

Introduction

Be aware of the difference between the system performance specifications and the equipment design specifications of the individual components in the system: Usually, for a specific project

The performance specifications of the two HVDC converter stations in China are compiled as a whole: Some parts of the HVDC system can also be specified and adopted separately

In this case, fully consider the coordination of each part with the performance goals of the entire HVDC system, and clearly stipulate that each part and the system

between interface: The typical parts that are easier to divide and clarify the interface are:

a) DC transmission lines, grounding electrode lines and grounding electrodes;

b) Long-distance communication system;

c) Valve hall, foundation and other civil works;

d) Reactive power sources, including AC shunt capacitor banks, shunt reactors, synchronous and static reactive power compensation devices;

e) AC switchgear;

f) DC switchgear;

g) auxiliary system;

h) AC filter;

i) DC filter;

j) Smoothing reactor;

k) Converter transformer;

l) Lightning arrester;

m) Series commutating capacitor;

n) Converter valve and its auxiliary equipment;

o) Control and protection system:

Note: The last four items are difficult to separate: In fact, it is not advisable to separate these four items:

Chapters 4~22 of this part comprehensively discuss the steady-state performance of HVDC systems:

Since the equipment is usually specified and purchased separately, taking into account the impact on the performance of the HVDC system, this section only covers HVDC transmission:

Electrical wiring, grounding electrode wiring and grounding electrode (see Chapter 11):

This section assumes that the HVDC converter station contains one or more converter units installed in a single location and their supporting buildings, electricity

Reactor, filter, reactive power source, control, protection, monitoring, measurement and auxiliary equipment: This section does not discuss AC switchgear, but includes

AC filters and reactive power sources, although they can be connected to the AC bus independent of the HVDC converter station (see Chapter 17):

Using grid commutated converter

Performance of HVDC System Part 1: Steady State

1 Scope

This part of GB/T 20996 gives comprehensive guidelines for the steady-state performance of high-voltage DC systems, involving the use of three-phase bridge (dual-circuit) connections

The steady-state performance of the two-terminal HVDC system that constitutes a 12-pulse (dynamic) converter unit (see Figure 1), but does not include the multi-terminal HVDC transmission system

System: The converter stations at both ends consider the use of thyristor valves as semiconductor converter valves, which have two-way power transmission capabilities: Two poles are not considered in this section

Pipe valve:

Description:

1---The winding on the valve side of the transformer:

Figure 1 12-pulse (dynamic) converter unit

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

IEC TR60146-1-2 and IEC 60146-1-31) give general aspects of grid-commutated semiconductor converters: This section does not consider voltage

Source inverter:

There is a difference between the system performance specifications and the equipment design specifications of the individual components in the system: This part does not specify equipment specifications and tests

Requirements, also did not include detailed seismic performance requirements: In addition, different HVDC systems may have many differences: This section does not

Consider these details: Therefore, this section should not be used directly as the technical specifications for specific engineering projects: However, it can be used as a specific

The transmission system compiles technical specifications that meet the actual system requirements:

This section covers steady-state performance, IEC TR60919-2 faults and operations, and IEC TR60919-3 dynamic performance: There are separate documents:

Pieces: When compiling the specifications for the two-terminal HVDC system, the three parts are considered together:

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 60633 High-voltage direct current (HVDC) transmission-Vocabulary]

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