1. Implementation background
With the development of informatization, power generation companies have generally introduced computer management systems and developed corresponding MIS systems to realize computer management within the enterprise, aiming to achieve a full range of information management solutions. However, in the information management of power generation companies, there are generally many problems of information silos and low data utilization rate. The most prominent performance is that due to security restrictions, the data in the production control system cannot be directly transferred to the upper management information system, and real-time and comprehensive information management cannot be truly achieved. The introduction of PI (Plant InformaTIon) real-time database can solve the main problems of informatization by building an enterprise-level data platform to realize the integration of management and control, thus providing guidance for the construction of informatization of power generation companies.
2. About PI system
PI is a large-scale real-time / historical database system developed by OSI software company and an essential foundation platform for enterprises to implement ERP projects. PI real-time database is a real time series database, with powerful data collection and management functions, long-term online storage and storage with data prototypes, and it has become a reliable public data source for the entire enterprise; it has good openness and diverse mature interfaces, which can be very It is easy to realize the integration of enterprise management and equipment control; it uses a patented compression algorithm, which takes up little disk space and has a fast response speed; its distributed collection of data on the interface machine perfectly solves the shortcomings in the company's information processing and makes up for Vacancy in company management.
3. Implementation process:
3.1 The architecture of the network topology:
In order to ensure the stable and safe operation of the production control system and avoid virus attacks, the overall safety protection plan is determined according to the principle of the secondary security system protection of the State Electricity Regulatory Commission of "safety zoning, network dedicated, horizontal isolation, vertical authentication". As shown in Figure 1.
The DCS, RTU, and desulfurization interfaces in the production control zone 1 are separated from the production control zone logically by the border firewall; the production control zone and the management information zone are equipped with dedicated power isolation devices to achieve physical isolation, and there is only a single Data exchange, that is, the real-time data in the PI system is transmitted from the production control area to the management information area. The PI server in the management information area is connected to the central 6509 switch through Gigabit fiber, and then to the desktop client through a 100M network cable.
Figure 1
3.2 Selection of interface scheme with control system
The DCS system of Units 1 and 2 of our company adopts the British Eurotherm NETWORK-6000 system, and the monitoring software of this system adopts FIX32; the real-time desulfurization system of Unit 1 adopts the DamaTIc XD system of Neles AutomaTIon of Finland; the real-time desulfurization system of Unit 2 adopts It is the British Eurotherm NETWORK-6000 system; others have also implemented ABB ERTU 560 and Hangzhou Skyworth RTU system.
PI real-time database provides standard interfaces based on OPC specifications and PI-API technology, and supports database interfaces developed using C ++ and VB SDK. Both interface softwares use TCP / IP communication protocol and both have buffer cache, which provides temporary storage and forwarding functions for the data sent to the PI server to ensure that the PI server is down due to maintenance, upgrade, backup and abnormal errors. The real-time data can still be continuously collected and saved in the local hard disk. When the PI server or network fault is eliminated, the interface program automatically fills the data in the hard disk back to the PI server. Buffer as a windows service will automatically run when the system starts.
3.2.1 Standard interface configuration
The desulfurization system of our company's 1 # machine adopts the standard interface system PI-IN-VS-DXD-NTI of PI and Damatic XD provided by OSI. The standard interface needs to edit the startup file and configure the measuring point attributes to ensure that the interface machine obtains the data from the Damatic XD controller and transfers the data to PISERVER1.
PI measuring point attributes:
Tag——The tag name of the measuring point.
PointSource-a single, unique character used to identify which interface the interface belongs to. For more information, please participate in the / ps command line parameter.
PointType-PI3 server supports Float16, float32, int16, int32, and digital types of data.
Location1, Location2, Location3, Location4, and Location5
| Attributes | Explanation |
| Location1 | Corresponding interface ID (see interface parameters / id) |
| Location2 | Indicates that the field type of the measuring point in FIX = 1 means that the Field type is F_CV, and all float and digital measuring points use this type. |
| Location3 | Does not work in the program |
| Location4 | Indicates the Scan Class number of the measuring point. This number corresponds to the interface / f parameter in order (starting from 1). |
| Location5 | Does not work in the program |
InstrumentTag-corresponds to the name of the measuring point in the FIX system.
Scan —— By default, the value of this attribute is 1, which means that the data scan for the measurement point is started. If it is set to 0, the interface will not scan the measurement point data.
Shutdown-This attribute only applies to PI3 systems. This attribute defaults to 1, indicating that when PI starts, the PI Shutdown subsystem writes the "SHUTDOWN" status to each measurement point.
To edit the startup file, set the following parameters:
3.2.2 Self-developed interface
PI-API provides an open programming interface and can be developed independently. The DCS system and RTU system of the 1 # and 2 # host computers all adopt the independently developed interface program. The interface program is responsible for the reading and writing of the program. The establishment and configuration of the new point is completed by the PI-SMT program. PI-SMT can be loaded into the EXCEL table to facilitate the establishment or modification of batch data.
Before using the interface program, install PI-API, read the data in the DCS system through the interface function, and then call the PI-API function to write the read and write data to the PI real-time database system in batches. pilogin.ini sets the server host name, IP address, port number, user name and other related information. tag.ini contains the correspondence between DCS data points and data points in the PI system. These two files satisfy the correct operation of the interface program .
3.3 Interface design of PI TO PI
In order to ensure the safety of the production control area, PISERVER is set in the control area and the management area, and the interface program PI TO PI realizes the data transmission from PIServer1 to PIServer2. PIServer1 runs the client program of the interface as the sending end of the data, and the comma separator file TAG.SCV associates the same point of the two areas through POINTID. When the network is interrupted or the interface fails, the data transmission from PIServer1 to PIServer2 is suspended. After recovery, the historical compensation function can ensure that data is not lost.
Four, system application examples
ProcessBook is the main graphical user interface of the easy-to-use PI system, which enables real-time and historical data in the PI system and other data sources to be effectively displayed. On the PC of each client, use the PI graphic display interface to create a common interactive graphic screen that can be saved and shared with other users. Users can quickly switch between browsing and creating modes to create dynamic and interactive screens. You can also use Microsoft VB application development tools embedded in PI ProcessBook to write scripts for screen and trend automation.
The report system is a set of application subsystems developed on the platform of the PI system. Using the EXCEL report embedded in VB mode, using EXCEL's own macro and load macro functions (a series of API functions), so that users can design the format and style of the report and define the calculation formula of the cell to achieve The basic data used in statistical reports such as hourly (daily) reports and logs can be accessed to generate all kinds of daily, monthly, quarterly and annual reports.
PI real-time database realizes data communication with relational database Oracle through pi-odbc, and provides data for operation management, operation optimization system and power market auxiliary decision-making system. The operation optimization system is based on the PI real-time database, which is calculated and analyzed by reading the data in the PI database, and writing the results back to the PI database, optimizing the thermal parameter curve, performing consumption analysis, small index calculation, etc. to guide the unit Optimized operation of the system and reduce operation costs; the operation management system reads PI real-time data at regular intervals and dynamically writes it to the central database of the operation management system. In the real-time data configuration management module of the operation management system, by configuring the database fields that require real-time data to correspond to the parameter points in the real-time database (that is, tag points), the system obtains data through the PI database interface according to the configured parameter points .
V. Implementation effects and deficiencies
After the company's PI system was put into use, it made up for information faults and integrated scattered information resources, especially organically combining the information of the management system and the control system to form a real plant-wide real-time production information system integration. Plant leaders and managers, technicians, and operators at all levels can always check the important parameters of the production site, and the overall flow chart of the entire plant can be seen at a glance through PI's ProcessBook. Relevant personnel can directly call production data in Excel through PI's DataLink software, which greatly improves the efficiency and accuracy of reports and data calculation. Through this system, you can effectively monitor the operating status of the unit, discover problems in time, and avoid major hidden dangers.
Our company's PI system uses a C / S architecture, and PDI graphic files are saved on the client PC, so that when the control system structure or point changes, it must be updated one by one client. PI-ACTIVEVIEW is used to build the B / S structure of the PI system. Because the drawings are stored on the server, the changes are transparent to the customer.
Although the PI real-time database provides a lot of data for operation management and operation optimization systems, there is currently no device management module that is directly transferred to the EAM (asset management) through the PI-ODBC interface.
In short, in power generation companies, we must continue to deepen the application of PI real-time database system, tap the potential to maximize the value of real-time data production, and achieve the sustainable development of information systems and the scientific development of enterprises.
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