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Foreword From the concept of plant-level monitoring information system (short for SIS) to its present appearance in just seven years, it has grown faster than any automation technology in history (including DCS). Power generation companies, design institutes, and IT vendors are also paying more attention to SIS than any other automation technology in history. It is widely believed that this is a breakthrough in the successful application of information technology in power generation companies. It can bring huge benefits to power generation companies and also bring tremendous business opportunities to IT companies. Since the SIS system hardly affects safety production, many power generation companies are very active in the application of SIS. The pilot project has not yet been put into production. Without successful application of experience, it has been promoted and applied in newly-built single-capacity 300 MW unit power plants. Even a small number of old plants are being gradually implemented. However, there are not many cases of successful application. Until now, only the “Power Plant Plant Level Optimization Control and Management System (SIS)†of Panshan Power Plant in Tianjin has passed the appraisal. According to the current state of the art, there is no conclusion as to how much the SIS system will bring to the power company's investment. The problem of SIS's rapid promotion, application and application experience and immaturity of technology has formed a sharp contradiction and needs urgent solution.
According to the “Technical Specification for Design of Thermal Power Plants†(DL5000-2000), when the planned capacity of a power plant is 1200 MW or more, a plant-level real-time monitoring system can be set when the single-machine capacity is 300 MW or more. At the same time, it is required that the configuration of the power plant information system be implemented step by step by the independent power generation companies based on the actual needs and the overall feasibility of technological development. Currently, power generation companies generally plan SIS systems in new construction projects. This article discusses how to solve the above-mentioned contradiction, and the relevant unit for SIS construction is referred to in the SIS planning process.
I. Necessity of adopting SIS system in infrastructure projects As mentioned earlier, SIS systems have little experience in application and the technology is not yet mature. Is there any need to rush to adopt it? The answer is yes, especially for new projects. Informatization is the development trend in the world today. Digitalization of power generation companies and the realization of informationization are the only roads for business development. Power plants must adopt information technology to reduce the cost of power generation and improve market competitiveness. For example, they can achieve optimal operation control, equipment condition monitoring, condition maintenance, and unit life management. Accumulation of historical data from the production stage of the unit is crucial. If the new project does not lay a foundation for informatization, it will certainly lag behind the development of the times in the future and lose its competitiveness in the market competition in the information age. In the infrastructure phase, if equipment selection does not take into account the needs of information, future information construction will inevitably encounter considerable difficulties. Therefore, the newly-built project adopts the SIS system, and it is necessary to lay a foundation for informatization from the initial stage of construction.
Second, from the actual needs of starting to rationally determine the SIS system target SIS system construction is a large-scale systems engineering, its own nature or information system. For the implementation of information engineering, the higher the target expectation is, the higher the risk is. The longer the implementation period is, the lower the probability of success is. According to this characteristic, enterprises must proceed from actual needs and rationally determine the functional requirements of the SIS system. Do not be too good and far away, blindly compare, in the functional requirements of seeking large and complete. When preparing tender documents, do not blindly list all kinds of functions. Instead, make overall plans according to the actual needs of the company and the feasibility of technological development. Determine the step-by-step implementation plan based on the actual needs and the maturity of the software functions. It is necessary to grasp the principle of preferring non-compliance rather than abuse, and instead of developing a large number of functions that are impractical or have no practical effect, it is better to concentrate human and financial resources and do a few practical functions that can produce real benefits, so that the company's investment can maximize its effectiveness. At the same time, it can also better promote the healthy development of SIS system applications.
Third, the implementation of infrastructure projects SIS system should pay attention to the convergence of the problem after the commissioning.
The construction of an information system is a long-term and continuous work that can never be accomplished overnight or once and for all. According to the integration principle of SIS application functions in the "Technical Conditions for Thermal Power Plant Plant Level Monitoring Information System" (Draft for Approval), the basic functions of SIS should include database functions, production process information collection, processing and monitoring, plant-level performance calculation, and unit Performance calculation, unit economic performance index analysis, optimization operation and operation guidance, equipment condition monitoring, unit performance test, unit life management and unit operation scheduling. The development and integration of application functions requires a lot of accurate equipment information, and it needs to be debugged after the unit is put into operation. It cannot be completed in the infrastructure cycle. Moreover, the construction of an information system such as SIS requires the close cooperation of multiple professions and requires the direct participation of production managers. In the project infrastructure stage, the equipment's information and information are very scattered, the construction period is tight, and the energy of the infrastructure management department is mainly focused on commissioning on schedule, and it is difficult to cooperate with the contractor to obtain accurate and timely information.
Considering the above situation, the SIS system implementing the infrastructure project must pay full attention to the convergence of the project after the unit is put into production. From the project planning phase, there must be full participation of the production preparation department and determine the phased objectives. For example, when the unit is handed over to production, the functions completed by the SIS should be defined in the hardware platform construction, database function, production process information collection, processing and monitoring, unit performance calculation, and unit economic performance index analysis. For other application functions, it should continue to be implemented after production. At the same time, the principle of step-by-step implementation is also reflected in the contract with the contractor, which not only facilitates management but also reduces investment risks.
Fourth, the initial construction goals should be based on the organization of data as the core SIS is based on the database as the core of information storage and application systems, and thus there are two main tasks, namely, data collection, storage and data applications. I think that SIS construction should be implemented in stages based on the division of these two tasks. The above-mentioned definition of the SIS system task in the infrastructure phase of the power plant is in line with this principle. The initial construction goal should be the data acquisition, processing and storage and preliminary application of information, and the rational organization of data should be the core task. There is an erroneous recognition that SIS should keep all the information of the process control system. The amount of SIS database labels should be greater than the total amount of label of the process control system. Therefore, some project database tags amount to 100,000 points. In fact not all process I/Os are meaningful to information systems. For example, on-site electric gates, the I/O signals entering the DCS generally have 5 to 7 points, and actually only the door opening and closing the two state quantities and the fault information are meaningful for the SIS. If the real-time data is not screened, all the data goes into the SIS database. As a result, the database that was purchased with a large amount of money will become a garbage library. The construction of the database and the screening of the data are very basic tasks and have a great influence on the application development and the long-term database management and maintenance. Therefore, it is strongly recommended that the owner screen the data entering the SIS during the preliminary design stage of the SIS system. However, this is a very heavy work. At present, there is no standard or mature model for reference. This work should be completed by experienced professionals such as operation, maintenance and performance tests.
The SIS data source is not limited to the real-time data of the monitoring system, but also includes dedicated measurement points, equipment status information, and basic equipment data used by advanced application functions, such as design parameters, installation information, and other non-real-time information. It is therefore particularly important to emphasize the overall planning of the SIS system. The contractor should submit a detailed list of advanced application function-specific data at the preliminary design stage of the system, so that the owner can coordinate the installation of other measurement points or submit design and installation data, and even consider the selection of fieldbus instruments.
The SIS system must collect scattered data, record it, and convert it into a uniform format for the information system. For exchange and processing. Since data is collected by different systems and converted in necessary formats, there are problems with accuracy, time-stamping, data quality problems caused by front-end system failures, and data errors caused by communication systems. When planning the data, the owner should conduct in-depth research on the classification, storage format, collection period, and validation rules of various data with the relevant units to ensure the availability of data.
Concluding remarks Faced with the new electricity market mechanism, how to improve the comprehensive automation and management level of the power plant, optimize the operation, reduce the cost of power generation and production, and enhance the competitiveness of enterprises have become the issues of common concern for power generation enterprises. The successful application of the SIS system can create direct benefits for the company. But if you blindly build, it will bring huge losses. The enterprise must have a sufficient estimate of the risk of the project during the SIS system planning phase. At present, the application of SIS systems is mostly concentrated in new construction and expansion projects. Due to the limited manpower, or insufficient understanding of the laws of the SIS system construction, sloppy bidding, the construction of the project has great blindness. In the implementation of many projects, no emphasis was placed on the data planning work. The entire design work relied on the contractor. This will eventually result in a system that is not based on solid foundations. Advanced application functions have a reputation and are not effective. The huge investment is only for a lot of data that is not practical and difficult to maintain, as well as some simple monitoring functions.
The SIS system is not a product but a systems project. Although SIS is separated from the concept of MIS, it has certainty in terms of its function, performance and technical requirements. In the process of SIS system construction, the company must also follow the rules of information system construction. It should fully absorb the past experience and lessons learned from the MIS construction of power companies in the past, and make unified planning, step-by-step implementation, and step by step. SIS development companies are faced with huge business opportunities, not to blindly expand their market share. They must work hard to improve their internal strength, be stable, and proceed from the interests of their customers, so that SIS can truly bring benefits to customers. In this way, we can better promote the healthy development of SIS and create a win-win situation.
[references]
1. The full realization of digitalization of thermal power plants should be our current goal Hou Ziliang 2003-12
2. Past, Present, and Future of SIS - Media Interview with Hou Ziliang 2004-3
3. SIS Implementation Considerations Zhang Jinbin 2004-7
Problems to be Considered in Power System SIS System Planning
Abstract : This paper proposes the countermeasures for the power generation enterprises to address the problem of the rapid application of SIS system and the technology is not yet fully mature. For thermal power companies, design institutes and SIS research units.