In information systems, the data engine is often a specialized technology for accessing databases. In 2000, the PineControl distributed control system research team found that it is possible to use database technology to develop: the supporting software system of the DCS control station, which can better support the implementation of the online configuration technology of the control system. To this end, the research team conducted in-depth research on real-time database technology based on industrial process automation control platform and corresponding data engine technology, and launched a new data engine technology with commercial application value.
The main feature of this technology is that it can generate the state change of the drive control logic element according to the input and output data, and achieve the purpose of effectively executing the control configuration algorithm. In fact, the data engine technology has also led to the establishment of a cross-platform control configuration standard, which is very beneficial to promote the development of DCS technology.
The basic principles of data engine technology reveal the role of this technology in transforming the performance of traditional DCS control stations. By analyzing the application of data engine technology in the DCS control station, it is explained how the technical standard of the control configuration should be established, and how the online compilation function of the control configuration logic will be implemented. Data engine technology has been used in some power plants and has achieved considerable success.
The configuration software of the control logic is the core technology of DCS. However, the control configuration software currently configured for DCS products has a series of technical problems to varying degrees. First, almost all DCS configuration software is based on the mechanism of transforming the control logic flow chart into a specific control instruction sequence, which limits the implementation of the online logic modification and cross-platform operation functions of the control logic. Secondly, the self-diagnosis capability of the DCS control configuration, the online monitoring capability and the real-time capability of the calculation process also have many problems. In the redundant switching process of the control station, the phenomenon of unsteady state transition is still very prominent. All of these problems are concentrated in the operating mechanism of the instruction sequence corresponding to the control configuration.
In the process of research and development of the PineControl distributed control system, the researchers proposed a new DCS configuration software environment: PineCAD. This configuration software is superficially different from traditional DCS configuration software, but PineCAD works by mapping the control logic flow diagram to a specific real-time database without forming calculation instructions for a particular DCS control station. sequence. A more important issue is that the PineCAD design philosophy is to transfer the configuration of the control logic to a virtual DCS control station (ie, the data engine) rather than the traditional DCS control station. This design idea is a major change in the development of DCS technology. If the data engine can be installed in a DCS control station of different platforms or a computing device such as PLC or PC, then PineCAD can integrate the corresponding system to form an integrated DCS, which can form the DCS configuration standard, and then The process of component upgrade, update, and system migration of DCS has a positive impact, bringing great application value to DCS users.
The data engine is a technical specification. It works in the same way as a car engine. Different car manufacturers have different engines, but these engines must adapt to the technical requirements of the standard gasoline physicochemical structure to generate power during the combustion process. The data engine is a collection of software that is attached to a specific DCS control station computing instruction environment and embedded in a specific real-time database to simulate the computational flow formed by the DCS configuration graphics, driving the calculation of the control component sequence of the entire control station. process.
In the DCS control station, we need to install a special real-time database, in which the technical functions of the data engine are set in the relevant properties of the database. When the configuration data of PineCAD is formed and downloaded to the real-time database, the state of each control element will undergo a specific change under the corresponding data engine attribute, thereby realizing the control function. We note that the calculation process of this control element and the calculation command system of the corresponding control station are isolated by the data engine, so the configuration data of PineCAD can be applied in different DCS control stations.
The data engine has replaced the computational processes and methods of traditional DCS control stations. The main operating mechanism includes the following aspects: control component topology calculation process management, control algorithm execution, online monitoring of control components, online correction of internal parameters of control components, online configuration processing, computational freeze of control components, management of control component calculation cycle Wait.
The online configuration of the control logic of the DCS control station is a very complex technology and a very important requirement in engineering practice. How to solve the continuity of the control variables in the control station before and after the control configuration modification is the core of the problem. The operating mechanism of the conventional DCS control station is difficult to ensure the continuity of the state of all control elements during this modification process, and thus it is easy to cause abnormal shutdown problems of the generator set. The DCS control station with data engine technology can solve this problem well. Because of the important feature of the data engine technology, the computational flow of the control component is based on the topological spatial structure of the control component, independent of the position of the relevant control component in the database or control station memory, as well as other features of the control component state (eg Status name, etc.) is irrelevant.
Due to historical and commercial reasons, the configuration data between DCS and PLC between different manufacturers cannot be directly compatible, which undoubtedly has many negative effects on the investment of industrial control systems. To this end, the International Electrotechnical Commission (IEC) established the IECll31 PLC standard in 1993. The IECll31-3 standard specifies five forms of programming languages. After 1998, the standard was changed to IEC61131. Nevertheless, we have seen that this only solves some of the compatibility problems of PLC configuration, and the compatibility of PLC configuration only stays at the similar level of interface morphology, DCS has no unified standard configuration form at all.
Like PLCs, DCS also requires a corresponding configuration standard. This standard will greatly protect the investment of DCS users, so that the configuration resources can be fully utilized during the rapid development of the control station platform technology and the DCS upgrade process; the configuration can also be effectively shared between different DCS systems. Resources; in an integrated DCS system, a unified configuration environment can be adopted to improve the reliability and maintainability of DCS. Therefore, in the rapid development of information technology, the standardization requirements of DCS configuration are quite important and quite urgent.
The technical difficulties of the DCS configuration standard are much larger than those of the PLC. Today, people are used to the mixing of digital and analog control signals. In addition to the cross-platform configuration requirements, the DCS configuration standard does not use five different styles of locale like a PLC. So, what technical methods can promote the establishment of DCS configuration standards? We believe that data engine technology is the most appropriate technical method for establishing DCS configuration standards. The data engine technology mechanism can establish a direct data processing mapping relationship between the PineCAD graphical configuration environment and different DCS control station computing instruction sets, which makes the manufacturer of the DCS control station and the manufacturer of the configuration software. Even DCS users do not have to invest a lot of technology in the process of promoting the standardization of DCS configuration.
In addition to the technical foundation of the DCS configuration standard, the data engine technology can eliminate the long-standing dispute between DCS control stations and PLCs, and promote PLC to become a DCS control station. This is of great value in both DCS technology and business.
The research and application of data engine technology has made great progress in the last two years. Researchers at Beijing Huaneng Xinrui Control Technology Co., Ltd. have taken advantage of the technical advantages of the data engine and have developed two new DCS systems, PineControl and HNA5000. Among them, PineControl passed the technical appraisal of the State Power Corporation in 2002. These two DCSs use different PLCs as control stations, which fully demonstrates the ability of the data engine to run across platforms and build integrated DCS. In such a DCS, the cores of all control stations are identical and do not change due to different control objects. The type of components of the control station is the smallest of the same type of products, and the combination of hardware is very easy. The PLC with data engine installed can achieve the advanced level of DCS products and technology in the world. As a PLC platform, the DCS control station has more environmental adaptability and reliability than traditional ones. DCS.
So far, the PineControl distributed control system has been operated in four coal-fired generating units and two power station auxiliary systems, and the HNA5000 will also be used in generator sets. These DCS application projects include the transformation of DCS system for 350Mw imported generator sets [3], the DCS project for newly-built domestic circulating fluidized bed boiler heating generator sets, the modification of large-scale generator set boiler ash removal control system, and the electrical control system for generating sets. DCS transformation and so on. After more than three years of operation practice, the design idea and implementation principle of data engine technology have been tested by various operating conditions of these generator sets, achieving good application quality with first-class control quality, safety, reliability and reliability, and the height of DCS users. Evaluation.
In short, the data engine is a new technology of DCS, which injects new vitality into DCS's future technological development, promotes the standardization of DCS system, truly realizes the online configuration function of DCS control station, and completely eliminates the DCS control station. The difference with PLC. In the future, with the rapid development of information technology, data engine technology will play an increasingly important role.
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