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Code for design of ±800kV DC converter station
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GB/T 50789-2012
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Standard similar to GB/T 50789-2012 GB/T 50785 GB/T 50786 GB/T 50783 Basic data | Standard ID | GB/T 50789-2012 (GB/T50789-2012) | | Description (Translated English) | Code for design of ��800kV DC converter station | | Sector / Industry | National Standard (Recommended) | | Word Count Estimation | 111,115 | | Quoted Standard | GB 500009; GB 50011; GB 50016; GB 50021; GB 50074; GB 50116; GB 50140; GB 50189; GB 50219; GB 50222; GB 50229; GB/T 311.2; GB/T 311.3; GB 3096; GB 12348; GB/T 16434; GB/T 20989; GB/T 22075; DL/T 605; DL/T 620; DL/T 621; DL/T 5044; DL/T 5056; DL/T 5136; DL | | Regulation (derived from) | Bulletin of the Ministry of Housing and Urban-Rural Development 1501 | | Issuing agency(ies) | Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China | | Summary | This standard is applicable to the design of the converter station project of the 800kV DC transmission system. | GB/T 50789-2012: Code for design of ±800kV DC converter station---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General
1.0.1 In order to standardize the design of ±800kV DC converter stations, make the design of the converter stations conform to the relevant national policies and regulations, and meet the requirements of safety, reliability, advanced application, economical rationality and environmental friendliness, this specification is formulated.
1.0.2 This code is applicable to the design of the converter station project of the soil 800kV two-terminal DC transmission system.
1.0.3 The design of the converter station should be combined with the engineering characteristics, adopting new technologies, new equipment, new materials, and new processes that are suitable for application.
1.0.4 The design of the converter station should take practical and effective measures to save land, protect the environment and meet labor safety requirements. Environmental protection, water and soil conservation, and labor safety and sanitation facilities should be planned in sync with the main project.
1.0.5 The design of the ±800kV DC converter station shall not only comply with this specification, but also comply with the current relevant national standards.
2 terms
2.0.1 converter
The equipment used to realize the mutual conversion of AC and DC power in the converter station is also called the converter valve group. Usually, the converter valve is connected to form a certain circuit for commutation. The converter is composed of one or more three-phase bridge converter circuits (also called 6-pulse converter or 6-pulse converter valve group) connected in series or in parallel. Two 6-pulse converters with a difference of 30° in series can form a 12-pulse converter, or a 12-pulse converter valve bank. By changing the triggering phase of the converter valve, the converter can operate in both the rectification state and the inversion state. Among them, the one that converts AC power into DC power is called a rectifier, and the one that converts DC power into AC power is called an inverter. The rectifier and inverter equipment are basically the same, collectively referred to as converters. The "valve group" appearing in this specification refers to the 12-pulse converter valve group unless otherwise specified.
2.0.2 converter valve
The bridge arm used as the basic unit equipment in the three-phase bridge converter used to realize the commutation in the direct current transmission system is also called single valve. The semiconductor converter valve used in modern direct current transmission is a general term for the bridge arm main circuit composed of semiconductor power electronic components connected in series (parallel) and the corresponding auxiliary parts assembled in the same box.
2.0.3 double valve unit
For the wiring of a 12-pulse valve group, the 12-pulse valve group is composed of two 6-pulse valve groups in series, and each phase of a 6-pulse valve group is composed of 2 converter valve arms. Structurally, the 2 valve arms of each phase are closely connected The valve towers formed together are called double valves.
2.0.4 quadruple valve unit
For the wiring of a 12-pulse valve group, the 12-pulse valve group is composed of two 6-pulse valve groups in series, and each phase of a 6-pulse valve group is composed of 2 converter valve arms. Structurally, the 4 valve arms of each phase are closely connected The valve towers formed together are called quadruple valves.
2.0.5 thyristor valve
A semiconductor converter valve consisting of thyristor elements and their auxiliary equipment.
2.0.6 valve hall
Buildings where diverter valves are installed. It is the main building in the converter station. The valve hall of the converter station is generally arranged in units of 12-pulse converter units, and each valve hall is arranged with a converter bridge and related equipment for each converter unit.
2.0.7 high voltage valve hall
When the poles of the converter station are composed of two 12-pulse converter units connected in series, install the converter bridge and related equipment buildings close to the pole line converter units.
2.0.8 Low voltage valve hall
When the poles of the converter station are composed of two 12-pulse converter units in series, install the converter bridge and related equipment buildings close to the neutral line converter unit.
2.0.9 Auxiliary facilities equipments of converter station
Other facilities required to ensure the normal operation of the main equipment of the converter station mainly include the power system of the station, the cooling system of the converter valve, the air conditioning system of the valve hall, the fire-fighting facilities and the grounding grid, etc.
2.0.10 bypass switch circuit by-pass breaker circuit
In the series mode of multiple valve groups per pole, the electrical circuit used to withdraw and input the 12-pulse valve group connected in parallel with it is usually composed of a bypass circuit breaker and the isolating switch for maintenance on both sides, and the bypass circuit breaker. It consists of a bypass isolating switch connected in parallel with circuit breakers.
2.0.11 Operational control mode
Mode of control of a converter unit, pole or station to maintain the operating parameters of the converter station at desired values.
2.0.12 additional control mode additional control mode
A mode of control of a converter unit, pole or station to help maintain the operating parameters of the ac system associated with the station at desired values.
2.0.13 Master station/slave station master station/slave station
One converter station of the two-terminal DC transmission system is defined as the master station, and the other converter station opposite to the master station is defined as the slave control station. The control system of the master station receives the control instructions issued by the dispatcher or the operator in the station, and transmits the instructions to the slave station through the DC telecontrol system, usually the rectifier station is selected as the master station. The master station/slave station can be converted under the condition of the DC telecontrol system intact.
2.0.14 DC telecontrol system telecontrol system
It is a system for signal transmission and data processing of DC system control signals, protection signals, operation signals and monitoring signals exchanged between converter stations at both ends.
2.0.15 pole control
The equipment used for the control and monitoring of one pole of the converter station usually includes the control system host, I/O unit and field bus.
2.0.16 converter valve unit control
Control and monitoring equipment set independently per valve bank between pole control and valve base electronics.
3 Site selection of converter station
3.0.1 In addition to the current industry standard "220kV~750kV Substation 220kV~500kV Substation Design Technical Regulations" DL/T 5218, site selection should also be combined with ±800kV converter station Process characteristics are determined through technical and economic comparison and economic benefit analysis according to the requirements of power system planning, land and space urban and rural planning, pollution conditions, water sources, transportation, land resources, environmental protection, and grounding electrode sites.
3.0.2 Site selection should meet the status and role of the converter station in the power system. The rectifier station should be close to the power center, and the inverter station should be close to the load center. When there are multiple converter stations in the same area, the site selection should analyze the influence of factors such as the electrical distance between the converter stations, common grounding electrodes, and external force damage on the power system.
3.0.3 The station site should not be selected in areas with severe atmospheric pollution or areas with severe salt fog. All kinds of serious pollution sources should be avoided. When it is difficult to completely avoid serious pollution sources, the converter station should be located on the windward side of the dominant wind of serious pollution sources, and the impact of pollution sources should be evaluated.
3.0.4 Site selection should comply with the relevant provisions of the current national standards "Code for Seismic Design of Buildings" GB 50011 and "Code for Geotechnical Engineering Investigation" GB 50021.
3.0.5 The station site should be coordinated with adjacent facilities and the surrounding environment. The distance between the station site and the airport, navigation station, satellite ground station, military facility, communication facility, and flammable and explosive facilities should comply with the relevant current national standards..
3.0.6 When the external cooling method of the converter valve is water cooling, there should be a reliable water source near the station site, and its water quantity and quality should meet the requirements of the converter station for production water, fire-fighting water and domestic water. The selected water source should avoid or reduce conflicts with other water sources. When surface water is used as the water supply source, the guaranteed rate of the designed dry water flow rate should not be lower than 97%, and the stability of the quality of the supplied water source should be guaranteed.
3.0.7 The station site should be selected near the traffic lines such as railways, highways and rivers, and the transportation conditions should meet the transportation requirements of large-scale equipment such as converter transformers and smoothing reactors.
4 Basic conditions of AC system and performance requirements of DC transmission system
4.1 Basic Conditions of AC System
4.1.1 The basic data of the AC system should include the following.
1 The range of AC bus voltage and frequency variation in the converter station.
2 The short-circuit current level of the AC side of the converter station.
3 Negative sequence power frequency voltage and background harmonic voltage.
4 Fault clearing time and single-phase reclosing sequence.
4.1.2 The equivalent AC system required for DC transmission system research should include the following.
1 Equivalent system for AC/DC simulation study.
2 Equivalent system for the study of electromagnetic transient characteristics of AC/DC system.
3 Equivalent system for reactive power switching and power frequency overvoltage research.
4 Equivalent impedances for AC filter performance calculations.
4.2 Performance requirements of DC transmission system
4.2.1 The rated parameters of DC transmission system shall include rated power, rated current and rated voltage.
4.2.2 The overload capacity of DC transmission system should include continuous overload capacity, short-term overload capacity and transient overload capacity.
4.2.3 The minimum allowed DC current of the DC transmission system should not be greater than 10% of the rated current.
4.2.4 Under the premise of not adding additional reactive power compensation capacity, any pole of the DC transmission system should have the ability to operate with reduced DC voltage. The voltage value of the step-down operation should be 70%~80% of the rated voltage, but the reactive power configuration can be assessed in a way that is not lower than 80% of the normal operating voltage.
4.2.5 The power transfer capability of the DC transmission system shall be determined according to the system requirements.
4.2.6 The bipolar direct current transmission system shall have the following basic operation modes.
1 Complete bipolar operation.
2 Incomplete bipolar mode of operation.
3 complete monopolar return to run mode.
4 Complete unipolar metal loop operation mode.
5 incomplete monopolar return to run mode.
6 Incomplete unipolar metal loop operation mode.
4.2.7 Reactive power compensation and voltage control shall comply with the following regulations.
1 The rectifier station should make full use of the reactive power provided by the AC system, and reactive power compensation equipment should be installed in the station for the insufficient part; the reactive power of the inverter station should be balanced locally. When the DC small load operation mode causes excess capacitive reactive power due to the input of the AC filter, the reactive power absorption capacity of the AC system can be used.
2 The reactive power compensation equipment should choose shunt capacitors, static compensators and synchronous condensers according to the strength of the AC system connected to the converter station. When parallel capacitors are used as reactive power compensation equipment, they should be designed uniformly with the AC filter.
3 Reactive power compensation equipment should be divided into several groups, and at least one group should be a backup.
4 In addition to meeting the requirements of reactive power balance, the grouping capacity of reactive power compensation equipment shall also meet the following requirements.
1) The steady-state AC bus voltage change rate caused by switching a single group of reactive power compensation equipment should be within the range that the system can bear, and should not cause the on-load tap changer of the converter transformer to operate;
2) The switching of any group of reactive power compensation equipment should not change the DC control mode or DC transmission power, should not cause commutation failure, and should not cause self-excitation of adjacent synchronous motors.
5 The reactive power capacity of reactive power compensation equipment should be calculated according to the long-term operating voltage of the AC system.
4.2.8 The DC transmission system should not generate subsynchronous resonance with adjacent generators.
4.2.9 The harmonic interference index and filtering of the AC system shall meet the following requirements.
1 The harmonic interference index on the AC bus of the converter station can be characterized by the distortion rate of a single harmonic, the total effective harmonic distortion rate and the harmonic waveform coefficient of the telephone. The harmonic interference index of the AC system shall comply with the provisions of Appendix A of this specification, and the harmonic order shall be calculated up to the 50th order. For AC systems of 220kV and above, the distortion rate of a single harmonic should not be greater than 1.0% for odd orders (the 3rd and 5th orders may not be greater than 1.25%), and the even order should not be greater than 0.5%; the total effective Harmonic distortion rate should not be greater than 1.75%; telephone harmonic form factor should not be greater than 1.0%.
2 The configuration of the AC filter should be determined according to the harmonics generated by the converter station, the background harmonics of the AC system, and the harmonic interference indicators.
4.2.10 The harmonic interference index and filtering of the DC system shall meet the following requirements.
1 The harmonic interference index of the DC system can be characterized by the equivalent interference current of the DC line. The calculation of the equivalent interference current of the DC line shall comply with the provisions of Appendix B of this specification, and the harmonic order shall be calculated up to the 50th order.
2 DC filters should be installed on the DC side of the converter station for the two-terminal DC system using overhead line transmission. The harmonic interference index of the DC system and the configuration scheme of the DC filter should be determined according to the actual situation of the communication line along the DC line of the specific project, the standard of the electromotive force of communication interference noise, the manufacturing technology level of the DC filter, and the equipment cost.
3 When there are excitation sources and resonance points of non-characteristic harmonics in the DC system, corresponding restrictive measures should be taken.
4.2.11 The determination of the loss of the converter station shall comply with the relevant provisions of the current national standard "Determination of the loss of the HVDC converter station" GB/T 20989.
4.2.12 The audible noise of the converter station shall comply with the relevant provisions of the current national standard "Audible Noise of HVDC Converter Station" GB/T 22075.
4.2.13 The design target value of DC transmission system reliability shall meet the following requirements.
1 Forced energy unavailability rate should not be greater than 0.5%.
2 The planned energy unavailability rate should not be greater than 1.0%.
3.The average number of forced outages of converter units should not be greater than 2 times/(unit.year).
4 The number of unipolar forced outages should not be greater than 2 times/(pole.year).
5 The number of bipolar forced outages should not be greater than 0.1 times/year.
4.2.14 The dynamic and transient performance of the DC transmission system should be determined according to the system research.
5 Electrical Design of Converter Station
5.1 Electrical main wiring
2 The AC filter should be connected to the AC bus connected to the converter unit in a large group.
3 A grounding switch should be installed in front of the high-voltage capacitor of the AC filter.
5.1.5 The wiring of the power system of the station shall comply with the following regulations.
The power supply for station 1 should be set according to three relatively independent power supplies, and one connection should be made from inside the station and one outside the station. The other connection point should be determined after technical and economic comparison and at least one should be connected from the AC system in the station.
2 The power consumption system of the station should adopt two levels of voltage. The power system of the high-voltage station should adopt the voltage of 10kV, and the power system of the low-voltage station should adopt the voltage of 380/220V.
3 The power system of the high-voltage station should adopt single-bus section wiring. The whole station should be equipped with two working busbars and a dedicated spare busbar. Each busbar should be powered by an independent power supply, and a section switch should be set between the working busbar and the spare busbar.
4 The power consumption system of the low-voltage station should be set according to the converter unit. The low-voltage substation power system of each converter unit should adopt single-bus single-section wiring, and the two sections of working buses should be powered by different high-voltage substation working buses, and a section switch should be set between the two sections of busbars.
5.2 Layout of electrical equipment
5.2.1 The layout of the AC switch yard should be determined through technical and economic comparison in combination with the layout of AC filters and reactive power compensation equipment, valve halls, converter transformers and converter buildings, and should comply with current industry standards and current national standards Relevant provisions of "Code for Design of 1000kV Substation" GB 50697, "Technical Regulations for Design of 220kV~500kV Substations for 220kV~500kV Substations" DL/T 5218 and "Technical Regulations for Design of High Voltage Power Distribution Devices" DL/T 5352.
5.2.2 The AC filter and reactive power compensation equipment should be arranged in a centralized or partitioned manner, and the overall layout design should also meet the noise standard requirements of the converter station boundary.
5.2.3 The layout of the DC switch yard shall meet the following requirements.
The outdoor or indoor layout of 1-pole bus equipment should be determined according to the environmental conditions of the site and the selection of equipment.
2 The converter bypass switchgear should be arranged outside the valve hall.
3 The layout of the DC switch field shall comply with the relevant provisions of the relevant national standards on the electromagnetic environment such as the electrostatic induction field strength.
4 The DC switchyard should be arranged in extremely symmetrical partitions, and the arrangement should be convenient for inspection, operation, transportation, maintenance and testing of equipment.
5.2.4 The arrangement of equipment in the valve hall shall meet the following requirements.
1 The arrangement of the converter valves should be based on the form of the converter transformer to select a double valve arrangement or a quadruple valve arrangement. When a single-phase double-winding converter transformer is used, a double-valve arrangement should be used; when a single-phase three-winding converter transformer is used, a quadruple-valve arrangement should be used.
2.Valve halls should be set up with high-end valve halls and low-end valve halls according to the converter unit, and their positional relationship should be determined according to the overall layout of the converter station.
5.2.5 The layout of the converter transformer and smoothing reactor should meet the following requirements.
1 The layout of the converter transformer and smoothing reactor should meet the overall layout requirements of the converter station.
2 The bushing on the valve side of the converter transformer should be inserted into the valve hall. The valve side bushings inserted into the valve hall arrangement shall adopt inflatable or dry bushings.
3 When the DC switchyard adopts indoor layout, the layout of the smoothing reactor should be determined based on technical and economic comparison to adopt indoor or outdoor layout. Dry-type smoothing reactors should adopt supporting arrangement. The smoothing reactor of the pole busbar should be arranged between the valve hall and the high voltage side of the DC filter.
4 The layout of the converter transformer and smoothing reactor should meet the site requirements for handling, installation and replacement.
5 The layout of the converter transformer and oil-immersed smoothing reactor should meet the fire protection requirements.
5.2.6 The control building and the relay room shall meet the following requirements.
1 The converter station should have a main control building and an auxiliary control building. The main and auxiliary control buildings shall be designed according to the planned capacity and built at one time.
2 The location of the control building should be convenient for operation and save cables. The control building and the valve hall should be arranged adjacent to each other and adopt a joint building.
3.Several relay cells should be set up in the whole station, and part of the control and protection equipment should be lowered to the relay cells.
5.3 Overvoltage protection, insulation coordination and lightning protection grounding of the converter station
5.3.1 The overvoltage protection of the converter station shall comply with the current national standard "Insulation Coordination of ±800kV HVDC Converter Station Equipment" GB/T 28541 and "Code for Design of Overvoltage Protection and Insulation Coordination of AC Electrical Installations" GB/T T 50064 National Current Standard "National Current Standard "Insulation Coordination Part 2.Guidelines for the Use of Insulation Coordination of High Voltage Power Transmission and Transformation Equipment" GB/T 311.2 and "Insulation Coordination Part 3.High Voltage DC Converter Station Insulation Coordination Procedure" GB/T 311.3, "Guidelines for Insulation Coordination of HVDC Converter Stations" DL/T 605 and "Overvoltage Protection and Insulation Coordination of AC Electrical Installations" DL/T 620.The direct lightning protection and grounding design of the converter station shall comply with the current national standard "Code for Design of Overvoltage Protection and Insulation Coordination of AC Electrical Installations" GB/T 50064 and "Code for Design of Grounding of AC Electrical Installations" GB T 50065 The current industry standard " Overvoltage Protection and Insulation Coordination of AC Electrical Installations" DL/T 620 and "Grounding of AC Electrical Installations" DL/T 621.
5.3.2 The overvoltage protection and arrester configuration of the converter station shall comply with the following regulations.
1 The overvoltage generated on the AC side should be limited by the surge arrester on the AC side.
2 The overvoltage generated on the DC side should be limited by the arrester on the DC side.
3 The important equipment of the converter station should be protected by its adjacent arrester.
4 The valve side winding of the converter transformer can be jointly protected by surge arresters that protect other equipment. The high voltage end of the valve side winding of the converter transformer with the highest potential can also be directly protected by the arrester close to it.
5 Arresters can be configured with multi-column parallel structures, or multiple arresters can be arranged in parallel and distributed.
6 Impulse capacitors should be installed on the DC side neutral busbar.
5.3.3 Other overvoltage protection measures shall meet the following requirements.
1 The thyristor shall be equipped with a protective trigger function.
2 The circuit breaker on the AC side of the converter transformer should be equipped with a closing resistor or a phase selection closing device.
3 The circuit breaker of AC filter and capacitor group should be equipped with closing resistor or phase selection closing device. Large groups of circuit breakers can be equipped with opening resistors.
5.3.4 The overvoltage caused by DC load shedding, ground fault clearance and "island" operation should be studied separately.
5.3.5 The insulation coordination of the converter station shall comply with...
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