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DL/T 996-2019: Specification of steam turbine control system for thermal power plant
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Basic data | Standard ID | DL/T 996-2019 (DL/T996-2019) | | Description (Translated English) | Specification of steam turbine control system for thermal power plant | | Sector / Industry | Electricity & Power Industry Standard (Recommended) | | Classification of Chinese Standard | F24 | | Classification of International Standard | 27.100 | | Word Count Estimation | 26,270 | | Date of Issue | 2019 | | Date of Implementation | 2019-10-01 | | Issuing agency(ies) | National Energy Administration | DL/T 996-2019: Specification of steam turbine control system for thermal power plant---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.
Specification of steam turbine control system for thermal power plant
ICS 27.100
F 24
People's Republic of China Electric Power Industry Standard
Replace DL/T 996-2006
Technical conditions of steam turbine control system in thermal power plant
Refractory materials for boilers in thermal power plants
2019-06-04 released
2019-10-01 implementation
Issued by National Energy Administration
Table of contents
1 Scope...1
2 Normative references...1
3 Terms and definitions...2
4 Basic regulations...4
5 Application functions...4
5.1 Basic requirements...4
5.2 Human Machine Interface...5
5.3 Control function...6
5.4 Restricted functions...9
5.5 Protection function...10
5.6 Test function...10
6 Electronic control device...10
6.1 System structure...10
6.2 Basic requirements...10
6.3 Redundant configuration requirements...12
6.4 Safety requirements...12
6.5 Human Machine Interface...13
6.6 Controller...14
6.7 Cabinet and grounding...15
6.8 Process input/output (I/O)...16
6.9 Power...17
6.10 Local instruments...18
7 Hydraulic system...18
7.1 Actuator...18
7.2 Electro-hydraulic conversion device...20
7.3 Oil system...20
7.4 Protection and restriction functions...21
8 Technical documents...21
8.1 Basic requirements...21
8.2 Hardware data...21
8.3 System Software Information...22
8.4 Application Software Information...22
8.5 I/O list and fieldbus network segment design data...22
8.6 Other information...23
9 Packaging and storage...23
9.1 Packaging requirements...23
9.2 Storage...23
10 Test...24
10.1 Factory Acceptance Test (FAT)...24
10.2 On-site acceptance...26
10.3 Assessment and warranty...26
10.4 Availability test...27
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard is a revision of DL/T 996-2006 "Technical Conditions of Steam Turbine Electro-hydraulic Control System for Thermal Power Plants". Editability
The main technical changes are as follows.
- Added the content of the digital electro-hydraulic control system (MEH) of the feedwater pump steam turbine.
- The standard applicable capacity is limited to units of 300MW and above.
- Terms and definitions have been updated in accordance with DL/T 701-2012.
- The original general regulations are changed to basic regulations, and the basic regulations only make overall requirements.
- The specific requirements and indicators in the original Chapter 8 technical specifications are incorporated into application functions, electronic control devices, and hydraulic systems.
Terms.
- Expanded and improved the man-machine interface, control function and other related content in the application function.
- The original electronic and protection system was changed to an electronic control device, and the relevant clauses were expanded.
- The original hydraulic and protection system was changed to a hydraulic system, and related clauses were expanded.
- Add two chapters on packaging, storage and testing.
Please note that certain contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents.
This standard was proposed by the China Electricity Council.
This standard is under the jurisdiction of the Power Industry Thermal Automation and Information Standardization Technical Committee (TC28).
Drafting organizations of this standard. Xi’an Thermal Power Research Institute Co., Ltd., Datang Binchang Power Generation Co., Ltd., Shanghai Electric Power Plant
Equipment Co., Ltd., Datang Changchun Third Thermal Power Plant, Zhejiang Datang International Wushashan Power Generation Co., Ltd., China Power Engineering Consulting Group
Northwest Electric Power Design Institute Co., Ltd.
The main drafters of this standard. Gao Haidong, Zeng Weidong, He Wenjian, Sheng Wei'an, Du Xuecong, Yang Yongqing, Shen Jingjun, Jia Qiangbang,
Huang Jinbao, Huang Haiyue, Xiong Kangjun, Xia Xinlei, Gao Jinghui, Wang Wei, Tang Zhizhuo, Chang Peng, Ning Haiqi, Gu Hongbin.
This standard replaces DL/T 996-2006 from the date of implementation.
This standard was first issued. June 1,.2006.This is the first revision. The previous version releases are as follows.
--DL/T 996-2006
The opinions and suggestions during the implementation of this standard are fed back to the Standardization Management Center of the China Electricity Council (Beijing Baiguang
Lu Er Tiao No. 1, 100761).
Technical conditions of steam turbine control system in thermal power plant
1 Scope
This standard specifies the function, performance and technical requirements of steam turbine control systems in thermal power plants. Steam turbines in this standard
The control system includes digital electro-hydraulic control system (DEH) and digital electro-hydraulic control system (MEH) of steam feed water pump and turbine.
This standard applies to steam turbine control systems for newly built or expanded thermal power plants with a unit capacity of 300MW and above. Other
The steam turbine control system of the capacity unit can be implemented by reference. Other drive turbine control systems in thermal power plants can refer to this standard
The relevant part is implemented.
2 Normative references
The following documents are essential for the application of this document. For dated reference documents, only the dated version applies
In this document. For undated references, the latest version (including all amendments) applies to this document.
GB/T 2421.1 Overview and Guidelines for Environmental Testing of Electrical and Electronic Products
GB/T 4208 Enclosure protection grade (IP code)
GB/T 7596 Mineral turbine oil quality in power plant operation
GB 11120 turbine oil
GB/T 13384 General technical conditions for packaging of mechanical and electrical products
GB/T 17214.1 Working conditions of industrial process measurement and control equipment Part 1.Climatic conditions
GB/T 17626.2 Electromagnetic compatibility test and measurement technology Electrostatic discharge immunity test
GB/T 17626.3 Electromagnetic compatibility test and measurement technology Radio frequency electromagnetic field radiation immunity test
GB/T 17626.4 Electromagnetic compatibility test and measurement technology Electrical fast transient pulse group immunity test
GB/T 17626.5 Electromagnetic compatibility test and measurement technology surge (impact) immunity test
GB/T 17626.8 Electromagnetic compatibility test and measurement technology Power frequency magnetic field immunity test
GB/T 17626.11 Electromagnetic compatibility test and measurement technology Voltage sag, short-term interruption and voltage change immunity
test
GB/T 18271.3 General performance evaluation methods and procedures for process measurement and control equipment Part 3.Influence quantity
Ringing test
GB/T 26863-2011 Thermal power plant monitoring system terminology
GB/T 29247-2012 General experimental methods for industrial automation instruments
GB/T 30372 Guidelines for Acceptance of Distributed Control Systems in Thermal Power Plants
GB/T 30370 Primary Frequency Modulation Test and Performance Acceptance Guide for Thermal Power Generating Set
GB 50229 Code for fire protection design of thermal power plants and substations
DL/T 571 Operation and Maintenance Guidelines for Phosphate Ester Fire-resistant Oil Used in Power Plants
DL/T 656 Steam turbine control and protection system acceptance test procedures for thermal power plants
DL/T 701 Terminology of Thermal Power Plant Automation
3 Terms and definitions
The following terms and definitions defined in DL/T 701 apply to this document. For ease of use, DL/T is listed repeatedly below
Some terms and definitions in 701.
3.1
Digital electro-hydraulic control system (DEH) digital electro-hydraulic control system
Consists of sensitive components designed according to electrical principles, digital circuits (computers), and amplifying components designed according to hydraulic principles
Turbine control system composed of hydraulic servo mechanism. [DL/T 701-2012, definition 4.53].
3.2
Digital electro-hydraulic control system (MEH) micro-electro-hydraulic control system for feed water pump steam turbine
A microcomputer and hydraulic servo mechanism are used to realize the control system of various functions of the feedwater pump and steam turbine.
Note. In fact, it is also a digital electro-hydraulic control system, but in order to distinguish it from the DEH of the main steam turbine, it is customarily called MEH.
[DL/T 701-2012, definition 4.59].
3.3
Unit coordinated control system (CCS) unit coordinated control system
A main control system of a unit unit, whose function is to integrate boilers and turbo-generator units with large differences in dynamic characteristics.
Load balance control enables the unit to respond to the dispatched load change requirements as soon as possible, and guarantees the main steam pressure and the main operating parameters of the boiler
The number is within the allowable range. In some specific working conditions, the protection of the control loop and control
Stable and economical operation; mainly includes unit load command control, main control of furnace and furnace, pressure setting, frequency correction, and auxiliary machine failure
Control loops such as load shedding; the directly acting execution level is the boiler control system and the steam turbine control system. [DL/T 701-
2012, definition 4.16]
3.4
Speed control
It is one of the functions of the steam turbine control system. During the startup, speed-up, and constant-speed operation of the steam turbine, the
The target speed and rate of rise change and/or maintain the turbine speed. [DL/T 701-2012, definition 4.54]
3.5
Load control/load governing
It is one of the functions of the steam turbine control system. After the unit is connected to the grid, it changes according to the set target load and load rate.
Or a function to maintain unit load. [DL/T 701-2012, definition 4.55]
3.6
Main steam pressure control
One of the functions of the steam turbine control system is to control the speed according to the deviation between the steam pressure in front of the main valve and the fixed value of the main steam pressure.
The valve opening is a function to maintain the main steam pressure at the set value. [DL/T 701-2012, definition 4.58]
3.7
Valve-position control
One of the functions of the steam turbine control system is to directly control the control mode of the steam turbine to adjust the opening of the steam valve. [GB/T 26863-
2011, definition 6.29.4.7]
3.8
Automatic turbine start-up and shut-down control system (ATC)
According to the thermal stress of the steam turbine or other set parameters, command the steam turbine control system to complete the start of the steam turbine and the grid-connected belt
Automatic control system for load or stop operation. [DL/T 701-2012, definition 4.52]
3.9
Automatic generation control (AGC) automatic generation control
According to the load command of the power grid dispatching center, the control of the generating power of the unit to meet the specified requirements. [DL/T 701-2012,
Definition 4.43]
3.10
Auxiliary machine failure load reduction (RB) run back
Control measures taken for the failure of the main auxiliary equipment of the unit. When the main auxiliary machine (such as feed water pump, blower, induced draft fan)
Measures to quickly reduce the load of the unit when the unit is out of work in the event of a failure and the unit cannot carry the current load. [DL/T 701-
2012, definition 4.27]
3.11
Unit fast cut back (FCB) fast cut back
A control measure to keep the boiler (including the atmospheric circulating fluidized bed) from shutting down when the steam turbine or generator dumps the load.
According to the different operation requirements of the unit after FCB, it can be divided into two different operations. the unit runs alone with auxiliary power or the unit stops without stopping the furnace.
Way. [DL/T 701-2012, definition 4.28]
3.10
Over-speed limit (OPC) over-speed protection control
Control function to suppress overspeed. When the turbine speed reaches or exceeds 103% of the rated speed, or the rotor acceleration exceeds the
When the value is set, the regulating valve is automatically closed, and when the speed returns to normal, the regulating valve is opened again, and the process is repeated until the normal speed
The control loop can maintain the rated speed.
3.11
Over-speed protection (OPT) over-speed protection trip
One of the functions of the steam turbine protection system. When the speed of the steam turbine rises to the protection limit, take emergency stop measures and automatically
Close the main valve and adjust the valve quickly.
3.12
Turbine emergency trip system (ETS) emergency trip system
When an abnormality occurs during the operation of the steam turbine, which may endanger the safety of the equipment, take emergency measures to stop the operation of the steam turbine.
Protection System. [DL/T 701-2012, definition 6.33]
3.13
Primary frequency compensation
The unit speed control system automatically and quickly changes the active power according to the change of the grid frequency to achieve the goal of stabilizing the grid frequency.
of. [DL/T 701-2012, definition 4.46]
3.14
Power load unbalanced (PLU) power load unbalanced
An operating condition in which the mechanical power of the steam turbine is far greater than the active power of the generator set.
3.15
Availability
The ratio of the time for a device or system to perform the specified function correctly and the total time for the scheduled function
The score is expressed, namely MTBF/(MTBF MTTR). [DL/T 701-2012, definition 7.90]
4 Basic regulations
4.1 The steam turbine control system is composed of electronic control devices and hydraulic systems.
4.2 The function, performance and overall scheme of the steam turbine control system shall be compatible with the main structure of the steam turbine.
4.3 The steam turbine control system should be a system with high reliability, fast response and easy maintenance.
4.4 When the DCS software and hardware meet the requirements of the steam turbine control system, the steam turbine control system
The electronic control device of the system should be integrated with the DCS.
4.5 The DEH controller should be independent of the ETS controller. For steam turbines with special requirements, the DEH controller can be combined with the ETS controller.
Shared.
4.6 Limited by the service life of electronic equipment, the service life of the steam turbine control system should not exceed 10 years.
5 Application function
5.1 Basic requirements
5.1.1 The application software of the control processor should be configured in a general programming language. The process flow chart should adopt the graphic method group
state.
5.1.2 According to the design requirements of the power plant process system, the signals of all designed measuring points shall be continuously collected and processed, and
Operation and storage in real-time and historical databases.
5.1.3 The signal acquisition for protection and control should be configured in the I/O module of the control processor that completes the relevant functions.
5.2 Human Machine Interface
5.2.1 The operator station should be able to monitor the operation of the unit, process system and equipment in real time, and timely monitor and handle abnormal working conditions and
Failure; the engineer station should be able to debug, modify, backup and maintain the database of the application software. Engineer station should be designed
authority management.
5.2.2 The monitoring and operation display screens should be organized in a hierarchical structure or a tree structure according to the technological process and operation requirements.
5.2.3 No more than three keystrokes should be used to call any one screen. Important systems or functions can be called up with one keystroke to call up the monitoring screen.
Shortcut keys, the real-time data refresh cycle displayed on the screen should not be greater than 1s.
5.2.4 The colors of equipment, pipes, and working fluids on the process flow chart should be set separately, and the colors and display methods of controlled equipment should be based on
According to its real-time status changes.
5.2.5 Real-time trend display. It should be able to analyze any real-time analog data in the system (original input signal or intermediate calculation
Value) configure the real-time trend display, the time resolution of a point on the real-time trend curve should be better than 1s, and the storage and display time should not be
Less than 30min. Should be able to choose to display the value and time label of any point on the real-time trend curve.
5.2.6 Historical trend display. It should be able to configure historical trend display for any analog data in the historical database.
The time resolution of the potential curve should be up to 1s, and can be displayed in different grades of time resolution as required. Should be able
Choose to display the value and time label of any point on the historical trend curve.
5.2.7 Bar graph display. The bar graph should be able to be configured in the process flow chart or other screens; any actuality in the steam turbine control system
Time analog data should be able to be configured into a bar graph; the bar graph should be able to change the color according to the alarm limit of the signal configuration.
5.2.8 Group parameter display. It shall be able to configure group parameter display for any data in real-time database and historical database;
Each group can contain no less than 5 parameters; according to the requirements of operation monitoring, the relevant field data of the data record can be selected
Display on the screen; when the display parameter reaches or exceeds the predetermined alarm value, the color and display mode should be changed.
5.2.9 Alarm display. A special alarm display screen should be designed. The alarm display should be arranged in chronological order and alarm signal level.
The latest alarm or simultaneous (high alarm level) should be displayed at the top or bottom of the alarm screen; the application does not
The same color distinguishes the alarm level, alarm confirmation status, and current alarm status; the configured alarm information should be complete and should be able to
Provide the information stored in the database of the alarm point for operation and maintenance personnel to analyze the fault.
5.2.10 Alarm confirmation. It should be possible to confirm the alarm on any screen containing an alarm point, and other
The screen of the alarm point should also be confirmed at the same time; if a confirmed alarm is issued again, it should have an alarm reset
Flash function, and at the same time indicate the number of repeated alarms in an appropriate display mode.
5.2.11 Alarm storage. All alarm information should be stored, and it should be able to call up at least 30 days of alarm information for display and display.
Printed.
5.2.12 Status and diagnostic information display. The display of the main control communication network status of the steam turbine control system shall be configured, and the control station shall diagnose
The broken screen should display the status of each I/O module, and should be able to display the status of each I/O channel;
5.2.13 Operation record. All operations performed by the operating personnel at the operator station and maintenance personnel at the engineering station shall be recorded
The exact time of each operation. By accurately recording the operation behavior of the operators, it is convenient to analyze the operations of the operators.
The intention is to analyze the cause of the crew accident. The system should automatically save at least 48h operation records, and should be able to transfer to history
Database or external storage medium.
5.3 Control function
5.3.1 DEH control method
5.3.1.1 According to the operating requirements of the unit, the following control methods shall be provided.
a) Operator automatic control mode. The operating personnel manually set the target speed, target load or
The target pressure, speed change rate, load change rate and pressure change rate are based on the results of steam turbine thermal stress evaluation.
It can be set manually or manually by the operator to realize the closing of the unit speed, load or main steam pressure/regulating stage pressure
Ring control
b) Coordinated control system (CCS) remote control. As the executive agency of CCS, DEH accepts remote control of CCS
Command to control the valve of the steam turbine;
c) The automatic start-stop control (ATC) mode of the steam turbine. According to the thermal stress and operating parameters of the steam turbine rotor, automatically set,
Optimize the speed change rate and load change rate, and automatically complete the starting, running, and stopping of the unit from cranking to rated load
Automatic control of the whole process of the machine;
d) Manual control mode (optional). It is a low-level control method for the unit. Operators manually operate, through control
Adjust the door opening to achieve load open loop control (or valve position control). In the speed control mode, the
Speed open loop manual control.
5.3.1.2 Operator automatic control and CCS remote control are necessary control methods for DEH systems. Between various control methods,
It should be able to perform bumpless switching.
5.3.2 MEH control method
5.3.2.1 According to the operating requirements of the unit, the following control methods shall be provided.
a) Speed control method. The operating personnel manually set the target speed according to the cold and hot status of the unit, and the speed change rate is determined by the operating
Manually set by personnel to realize closed-loop control of feedwater pump steam turbine speed;
b) Remote control method. MEH, as the actuator of the water supply control system, accepts remote control of the water supply control system
Command to control the valve of feedwater pump steam turbine;
c) Manual control method. It is a low-level control method for the unit. Operators manually operate, adjust the door opening by controlling,
Realize open-loop control of feed water flow (or valve position control). Under normal operating conditions, it is not advisable to switch to manual control
System operation.
5.3.2.2 Speed control and remote control are necessary control methods for the MEH system. Between various control methods, it should be able to carry out
Bumpless switching.
5.3.3 DEH control function
5.3.3.1 Basic requirements
DEH should be able to realize speed control, load control, main steam pressure/regulation stage pressure according to different operating conditions of steam turbines.
Basic control functions such as force control and valve position control.
5.3.3.2 Speed control
During the start-up and load rejection stages of the steam turbine, the speed control of the steam turbine should be achieved and the following requirements should be met.
a) The speed adjustment range should be 50r/min to 112% of the rated speed, and it should be continuously adjustable. The speed increase process should be stable and
Control; when the steam turbine is set to the rated speed, the overshoot should be less than 0.2% of the rated speed, and the speed fluctuation range
Should not be greater than 0.1% of the rated speed;
b) The target speed and speed change rate are manually set in the operator automatic control mode, and automatically set in the ATC mode
It can also be subject to human intervention;
c) The maximum speed change rate should not be greater than the specified value of the steam turbine design, and the speed change rate when passing through the critical speed zone should not be
Lower than the specified value of steam turbine design;
d) After the load rejection of the steam turbine generator set, the maximum speed should not cause the overspeed trip protection to act;
e) Synchronous control. It should be able to accept the control signal of the synchronization device to increase or decrease the speed of the steam turbine.
5.3.3.3 Load control
After the unit is connected to the grid, it can realize unit load control and meet the following requirements.
a) After the unit is connected to the grid, it should carry an initial load of 2% to 5% of the rated load;
b) The load control range is 0～110% of rated power, and it is continuously adjustable. The load fluctuation range should not exc...
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