Abstract : This paper presents a new concept-a plant-level control system for thermal power plants based on the current status and trends of price-port automation technology. The author discusses in detail the definition and connotation of the plant-level control system in thermal power plants, the inevitability of its formation, the differences with the plant-level monitoring information system (SIS), and the new plant-wide information and control network structure that will be formed. The author initiated the discussion and hoped to cause extensive discussions to promote the continuous development of thermal power plant information and automation technology. He also hoped to help the industrial development of SIS and DCS suppliers and application technology developers.
Keywords: plant-level control systems, plant-level monitoring information systems, information, automation, network structure I. Preface In 1997, Chinese experts proposed the concept of a supervisory information system at plant level (SIS) for thermal power plants, and formed a The standardized three-level information and control network structure of thermal power plants DCS, SIS and MIS has promoted the overall information and automation level of thermal power plants in China, as well as the formation and development of SIS industry.
Any theories and concepts should not be rigid immutable dogmas. They all have objective conditions that arise. When conditions change, based on new situations, new concepts should be proposed in a timely manner. Thermal power plant information and automation have experienced 14 years of development since then, and their objective needs and application technology and computer technology have undergone great changes. After studying these developments, the author believes that a brand-new concept, the Plant Super Viscous Control System (PSCS), will soon form and will change the original plant-wide information and control network structure of the thermal power plant. It is the issue that this article will explore.
II. Inevitability of Plant-level Control System Formation in Thermal Power Plants The plant-level control system of thermal power plants (or, it can be said, the upper control system of DCS of the unit units) has its objective inevitability. It is our country's first decade of the 21st century. Thermal power plants The emergence of information and automation requirements and the inevitable result of technological development.
First, the demand for plant-level direct scheduling of unit load is quickly mentioned on the agenda. As we all know, hydropower plants and nuclear power plants are suitable for scheduling systems that use direct system adjustment. However, due to the large number of grids in thermal power plants and the large differences in static and dynamic characteristics of the units, various types of units have different functions within the network. Therefore, in addition to the power grid, Considering the optimal scheduling of all types of thermal power plants, a thermal power plant must also fully consider how to optimize the scheduling of each unit load. This is directly related to the overall energy saving and emission reduction of the power plant and even the power grid, and it is economically efficient to meet the needs of the era of low-carbon economy. The thermal power plant adopts a non-direct regulation method to obtain widespread welcome from power plants and is gradually becoming the consensus of dispatch centers at all levels of the power grid.
SIS has the function of optimizing the dispatching of plant-level unit load, but SIS belongs to the non-control area (safety area II) in the production control area. Therefore, the current core is how to build a reliable plant-level optimized load dispatching control system platform that allows dispatch centers and power plants to be assured.
Second, the need to develop smart optimization controls. Due to China's special energy structure, thermal power plants will still occupy a very important leading position in China's power generation for a long period of time. Therefore, the energy-saving and emission-reduction of thermal power plants have a significant bearing on China's commitment to international energy-saving and emission reduction, and traditional control systems can no longer meet the requirements. It is in this context that intelligent optimization control technology has been piloted and applied at various power plants. This is the next goal that must be accomplished in conjunction with smart grid development. The development of optimal control application technologies requires the establishment of a unified control platform for the DCS of a unit. This has clear advantages:
a) Dividing the power plant control system into the supervisory control level (SCL) and the traditional direct control level (DCL) are beneficial to control safety.
b) It is beneficial to integrate system platforms such as databases and application systems such as modeling and optimization to save control system resources.
c) It better solves the specificity of the DCS of each manufacturer and the openness of the upper control platform, so that each optimization control supplier can participate and coordinate with each other.
Third, the need to develop intelligent security monitoring. With the increase of unit capacity and the increase of parameters, the number of parameters that a crew needs to monitor has reached 10,000 points. These parameters are changing rapidly under abnormal conditions, and operators cannot observe their changes in time, and these changes are reflected. There are problems with the unit and potential faults. The display of single parameters and simple alarms can no longer meet the requirements. It is urgent to develop technologies such as artificial intelligence, logical reasoning, and data mining to deeply process a large number of relevant data, and clearly indicate to the operating personnel. The problems and potential dangers in the operation of the unit, the handling of opinions, and even eventually reached the control instructions issued to deal with the accident. If this can be done, then many anomalies or accidents can be avoided or eliminated in time. The development of intelligent security monitoring also requires a relatively complete support platform, DCS upper control platform just adapted to its needs.
Fourth, the development of computer technology laid the foundation for the establishment of a superior control system. By planning and establishing a common platform from the very beginning, it can effectively speed up the development of the power plant control system to intelligent development.
As we all know, current computer technology, especially DCS technology, has made great progress. Some advanced DCSs have widely applied the “domain†technology that can be flexibly interconnected and can be safely isolated. The database size can reach over 100,000 points. , Storage time can be more than a year, communication and computing speed greatly improved, these are enough to support the implementation of advanced intelligent applications and meet the control level reliability requirements of plant-level control system (PSCS) conditions. We want to guide DCS to provide users with an open superior control platform. With this platform, DCS can provide application functions related to the plant-level control system. It also allows other application software vendors to integrate advanced application software of their expertise into this. The platform comes up and can protect its intellectual property. Only in this way can we end the disarray of the upper computers that deal with their dedicated software on the unit DCS.
III. Definition and Connotation of Plant-level Control System of Thermal Power Plant The thermal power plant plant-level control system (PSCS) is a higher-level control system for the unit DCS that has long-term and real-time requirements for the long-term value and unit operator online service (or The upper level DCS) implements plant-level monitoring and control, and crew-level tasks that require sophisticated intelligence and processing for superior intelligent monitoring and control.
Plant level control system (PSCS) and plant level monitoring information system (SIS) are the same systems that serve the real-time production process of thermal power plants. And their main differences are:
l) Application function PSCS: belongs to the category of control system (Control System) SIS: belongs to the category of supervisory information system (2) service object PSCS: long value, operating personnel SIS: mainly engaged in factory management, plant management, biotechnology professionals . Of course, it can also be used for value and operation personnel reference. 3) Real-time PSCS: Real-time requirements are high, and it should basically be equivalent to the unit DCS SIS: mainly used for operational management personnel background discontinuous monitoring analysis research, relatively speaking, real-time requirements Between MIS and DCS.
4) Reliability PSCS: Like the DCS, it belongs to the Class I safety zone SIS: it belongs to the Class II safety zone between MIS and DCS.
IV. The overall structure of thermal power plant information and control networks With the advent of plant-level control systems, the overall structure of thermal power plant information and control networks will also change, as shown in the following figure:
l) System security zones 2 and 3 are moved to the PSCS due to functions such as plant-level load scheduling with higher security levels in the SIS. Therefore, the power generation enterprises are divided into production control regions and management information regions according to the state (safety zone III). The production control area can be divided into the control area (safe area I) and the non-control area (safe area II). SIS can be included in the management information area together with MIS and BPS (safe area III). , but pay special attention to consider the high confidentiality requirements of BPS.
Other systems in the network can be included in the safety zone I. Suitable physical isolation measures should be taken in the zones I and III.
2) Plant level control system (PSCS) can use the same kind of DCS as unit unit, apply the concept of “domain†to interconnect them and adopt certain safety isolation measures; if the conditions are not available, it can also be plant-level control The system is configured with a dedicated control platform (including a database) that meets the requirements of the safety class and reliable interconnection measures with the DCS of the unit unit.
3) Whether the control system of the plant level adopts the scheme of one domain of DCS, or dispose the special control platform, it must be open, at the same time can protect intellectual property of senior application software developer. Because the development of the application function of the plant-level control system will be a long-term historical task accompanied by the construction of intelligent power plants, and there will be many developers involved in succession.
V. Concluding remarks The construction of the plant-level control system is the next goal of China's first decade of the 21st century and the development of automation technology for thermal power plants. It has established a unified goal for the development and intelligentization of thermal power plant monitoring and control systems. The platform will also attract and promote thermal power plants step by step to intelligent development.
This article only outlines the concept and outline of plant-level control systems in thermal power plants. Some aspects, such as the emergence of plant-level control systems, have implications for the industrial development of SIS, DCS, and application technology developers. The author hopes to In order to stimulate discussion and active ideas, the purpose is to promote the automation technology and level of thermal power plants into the second decade of the 21st century to a higher level.
Keywords: plant-level control systems, plant-level monitoring information systems, information, automation, network structure I. Preface In 1997, Chinese experts proposed the concept of a supervisory information system at plant level (SIS) for thermal power plants, and formed a The standardized three-level information and control network structure of thermal power plants DCS, SIS and MIS has promoted the overall information and automation level of thermal power plants in China, as well as the formation and development of SIS industry.
Any theories and concepts should not be rigid immutable dogmas. They all have objective conditions that arise. When conditions change, based on new situations, new concepts should be proposed in a timely manner. Thermal power plant information and automation have experienced 14 years of development since then, and their objective needs and application technology and computer technology have undergone great changes. After studying these developments, the author believes that a brand-new concept, the Plant Super Viscous Control System (PSCS), will soon form and will change the original plant-wide information and control network structure of the thermal power plant. It is the issue that this article will explore.
II. Inevitability of Plant-level Control System Formation in Thermal Power Plants The plant-level control system of thermal power plants (or, it can be said, the upper control system of DCS of the unit units) has its objective inevitability. It is our country's first decade of the 21st century. Thermal power plants The emergence of information and automation requirements and the inevitable result of technological development.
First, the demand for plant-level direct scheduling of unit load is quickly mentioned on the agenda. As we all know, hydropower plants and nuclear power plants are suitable for scheduling systems that use direct system adjustment. However, due to the large number of grids in thermal power plants and the large differences in static and dynamic characteristics of the units, various types of units have different functions within the network. Therefore, in addition to the power grid, Considering the optimal scheduling of all types of thermal power plants, a thermal power plant must also fully consider how to optimize the scheduling of each unit load. This is directly related to the overall energy saving and emission reduction of the power plant and even the power grid, and it is economically efficient to meet the needs of the era of low-carbon economy. The thermal power plant adopts a non-direct regulation method to obtain widespread welcome from power plants and is gradually becoming the consensus of dispatch centers at all levels of the power grid.
SIS has the function of optimizing the dispatching of plant-level unit load, but SIS belongs to the non-control area (safety area II) in the production control area. Therefore, the current core is how to build a reliable plant-level optimized load dispatching control system platform that allows dispatch centers and power plants to be assured.
Second, the need to develop smart optimization controls. Due to China's special energy structure, thermal power plants will still occupy a very important leading position in China's power generation for a long period of time. Therefore, the energy-saving and emission-reduction of thermal power plants have a significant bearing on China's commitment to international energy-saving and emission reduction, and traditional control systems can no longer meet the requirements. It is in this context that intelligent optimization control technology has been piloted and applied at various power plants. This is the next goal that must be accomplished in conjunction with smart grid development. The development of optimal control application technologies requires the establishment of a unified control platform for the DCS of a unit. This has clear advantages:
a) Dividing the power plant control system into the supervisory control level (SCL) and the traditional direct control level (DCL) are beneficial to control safety.
b) It is beneficial to integrate system platforms such as databases and application systems such as modeling and optimization to save control system resources.
c) It better solves the specificity of the DCS of each manufacturer and the openness of the upper control platform, so that each optimization control supplier can participate and coordinate with each other.
Third, the need to develop intelligent security monitoring. With the increase of unit capacity and the increase of parameters, the number of parameters that a crew needs to monitor has reached 10,000 points. These parameters are changing rapidly under abnormal conditions, and operators cannot observe their changes in time, and these changes are reflected. There are problems with the unit and potential faults. The display of single parameters and simple alarms can no longer meet the requirements. It is urgent to develop technologies such as artificial intelligence, logical reasoning, and data mining to deeply process a large number of relevant data, and clearly indicate to the operating personnel. The problems and potential dangers in the operation of the unit, the handling of opinions, and even eventually reached the control instructions issued to deal with the accident. If this can be done, then many anomalies or accidents can be avoided or eliminated in time. The development of intelligent security monitoring also requires a relatively complete support platform, DCS upper control platform just adapted to its needs.
Fourth, the development of computer technology laid the foundation for the establishment of a superior control system. By planning and establishing a common platform from the very beginning, it can effectively speed up the development of the power plant control system to intelligent development.
As we all know, current computer technology, especially DCS technology, has made great progress. Some advanced DCSs have widely applied the “domain†technology that can be flexibly interconnected and can be safely isolated. The database size can reach over 100,000 points. , Storage time can be more than a year, communication and computing speed greatly improved, these are enough to support the implementation of advanced intelligent applications and meet the control level reliability requirements of plant-level control system (PSCS) conditions. We want to guide DCS to provide users with an open superior control platform. With this platform, DCS can provide application functions related to the plant-level control system. It also allows other application software vendors to integrate advanced application software of their expertise into this. The platform comes up and can protect its intellectual property. Only in this way can we end the disarray of the upper computers that deal with their dedicated software on the unit DCS.
III. Definition and Connotation of Plant-level Control System of Thermal Power Plant The thermal power plant plant-level control system (PSCS) is a higher-level control system for the unit DCS that has long-term and real-time requirements for the long-term value and unit operator online service (or The upper level DCS) implements plant-level monitoring and control, and crew-level tasks that require sophisticated intelligence and processing for superior intelligent monitoring and control.
Plant level control system (PSCS) and plant level monitoring information system (SIS) are the same systems that serve the real-time production process of thermal power plants. And their main differences are:
l) Application function PSCS: belongs to the category of control system (Control System) SIS: belongs to the category of supervisory information system (2) service object PSCS: long value, operating personnel SIS: mainly engaged in factory management, plant management, biotechnology professionals . Of course, it can also be used for value and operation personnel reference. 3) Real-time PSCS: Real-time requirements are high, and it should basically be equivalent to the unit DCS SIS: mainly used for operational management personnel background discontinuous monitoring analysis research, relatively speaking, real-time requirements Between MIS and DCS.
4) Reliability PSCS: Like the DCS, it belongs to the Class I safety zone SIS: it belongs to the Class II safety zone between MIS and DCS.
IV. The overall structure of thermal power plant information and control networks With the advent of plant-level control systems, the overall structure of thermal power plant information and control networks will also change, as shown in the following figure:
l) System security zones 2 and 3 are moved to the PSCS due to functions such as plant-level load scheduling with higher security levels in the SIS. Therefore, the power generation enterprises are divided into production control regions and management information regions according to the state (safety zone III). The production control area can be divided into the control area (safe area I) and the non-control area (safe area II). SIS can be included in the management information area together with MIS and BPS (safe area III). , but pay special attention to consider the high confidentiality requirements of BPS.
Other systems in the network can be included in the safety zone I. Suitable physical isolation measures should be taken in the zones I and III.
2) Plant level control system (PSCS) can use the same kind of DCS as unit unit, apply the concept of “domain†to interconnect them and adopt certain safety isolation measures; if the conditions are not available, it can also be plant-level control The system is configured with a dedicated control platform (including a database) that meets the requirements of the safety class and reliable interconnection measures with the DCS of the unit unit.
3) Whether the control system of the plant level adopts the scheme of one domain of DCS, or dispose the special control platform, it must be open, at the same time can protect intellectual property of senior application software developer. Because the development of the application function of the plant-level control system will be a long-term historical task accompanied by the construction of intelligent power plants, and there will be many developers involved in succession.
V. Concluding remarks The construction of the plant-level control system is the next goal of China's first decade of the 21st century and the development of automation technology for thermal power plants. It has established a unified goal for the development and intelligentization of thermal power plant monitoring and control systems. The platform will also attract and promote thermal power plants step by step to intelligent development.
This article only outlines the concept and outline of plant-level control systems in thermal power plants. Some aspects, such as the emergence of plant-level control systems, have implications for the industrial development of SIS, DCS, and application technology developers. The author hopes to In order to stimulate discussion and active ideas, the purpose is to promote the automation technology and level of thermal power plants into the second decade of the 21st century to a higher level.
ordinary intermittent pre expander,Foam Pre Expander Machine,EPS Foam Pre Expander Machine
Hangzhou Sutuan Machinery Co.,Ltd.
Leading EPS EPP ETPU machinery manufacturer , https://www.sutuanmachinery.com