Design and implementation of energy management sys

Design and implementation of energy management system based on ariems framework

energy management systems (EMS) implement flat management of energy. EMS has built an enterprise level management and control integrated computer system integrating process monitoring, energy scheduling and energy management. The system manages the generation, storage, distribution, conversion and consumption of energy; It has complete information, scientific analysis ability and safe and efficient scheduling technology

1 overall design of energy management system

1.1 design principles

the system design fully considers the requirements of enterprises for centralized monitoring, unified scheduling and balance optimization of various energy media, as well as the requirements for remote operation and control of unattended station equipment. And fully meet the integrated system integration requirements of process control, information management and database

in the process of system design, we also consider the special needs of EMS for massive information processing, unattended technical security, fast response ability and so on, and choose advanced and mature solutions. At the same time, in addition to meeting the current needs, the series of products in time and space are fully considered to be pollution-free, low noise, high efficiency and scalability. The open architecture is adopted to enhance the connectivity with third parties, and it is easy to expand. In order to extend the life cycle of the system, enhance the momentum of development, and meet the needs of fierce market competition

1.2 system architecture

the energy management system is designed as a three-tier structure from the functional level. The bottom layer is the information acquisition layer, the middle layer is the real-time data processing layer, and the upper layer is the application management layer. The signal acquisition layer is composed of RTU, PLC, remote i/o and other acquisition equipment, which mainly realizes data acquisition and real-time control; The main equipment in the middle layer is i/o server, which mainly completes real-time data processing and short-term archiving; The upper main equipment includes application server, database server, engineer station, operator workstation, large screen control system, etc. The above-mentioned system is set up under the support of various software to form a fully functional system to realize process control, balanced scheduling, energy information, and management of installation precautions of hydraulic universal material testing machine

2 application function overview

ems application function is mainly composed of process monitoring and energy information management

2.1 process monitoring

ems process monitoring is mainly to collect the on-site real-time status into EMS through the on-site collection station, show it to users through the EMS screen, and provide control means for scheduling

process monitoring summarizes and sorts out all the information, stores it in the real-time database by partition and time, and provides functions such as trend, alarm, report, etc. It is divided into five subsystems according to different media or objects:

1) power supply and distribution system: including general substation, regional substation, power station, etc., excluding workshop substation, electrical room, switching station; However, the workshop substation with particularly heavy load can be monitored. It is convenient for the dispatcher to understand the switching on and off of heavy load. The substation that needs to be monitored mainly realizes the four remote functions. Remote control of switches, knife switches, transformer on load voltage regulating device taps in unattended substations: remote signaling includes switch knife switches, fault alarms, protection actions, fire alarms, access control, etc; Telemetry includes current, active power, reactive power, power factor, voltage, frequency, gear, etc. of each interval, according to the actual situation. Only partial telemetry is taken for each interval; All electrical measurement signals within the jurisdiction. The workshop substation and other manned stations can be monitored as needed without remote control

2) gas system: manage the gas holder, gas release tower, gas pressurization station and gas mixing device under the jurisdiction of the power plant, and monitor the equipment in these areas; Unattended stations realize remote control

3) other gases: including steam system, blast furnace blast system, compressed air system, oxygen nitrogen xenon system. The production units of steam system and blast furnace blast system are closely related to other main processes on site, so the control is carried out on site, and EMS only monitors; The process of oxygen, nitrogen and argon system is complex, so it must be controlled on site, and EMS only collects information. The compressed air system only monitors regional air compressor stations

4) water system: the on-site water station is divided into water intake station, pipe delivery station, circulating water station of each workshop, sewage station, etc. The circulating water station cooperates with each main process unit, and the operation is controlled at the process unit side. EMS only manages the water supply pump station of the pipe, controls the water supply pump and stabilizes the water pressure

5) environmental monitoring: EMS manages the dust collectors of the whole plant and understands the operation status of the dust collectors on site. Monitor other environmental protection data of the whole plant, including drainage water quality, dust, NO2, etc

2.2 energy information management

energy information management mainly uses the production performance information provided by the real-time database. Er directly aggravates the conflict between the two documents. P, the production and planning information provided by the MES system, as well as some technical parameters stored in the system, carry out fine management of energy. Tap the potential of energy conservation. Take the summary data provided by the system as the benchmark to assess all users and strengthen the awareness of energy conservation. The main functions include: energy performance balance analysis, energy plan management, energy prediction and optimization scheduling, energy cost management, energy quality management, energy equipment operation management, energy report management, web-based operation management support, power system optimization, Energy GIS, circular economy management, etc. As shown in Figure 1

Figure 1 Relationship diagram of energy information management module

3 description of energy information data collection

energy information collection data mainly includes: purchase amount, usage amount, loss amount and quality of purchased energy; Production, distribution, consumption, loss and quality of self-produced energy; Energy management parameters, operation parameters of key energy equipment, key process equipment and energy, we will make greater efforts to do a good job in products and service equipment safety and alarm information; Output, quality, yield and other data related to energy calculation

the data collected by the energy management system mainly comes from three sources:

EMS collects and processes energy data from the on-site collection station in a way

input EMS system data offline, such as quota, price, resource volume, etc

information obtained from other information systems (EMP, MES), such as production plan, output performance, etc

the collected data mainly include:

electric quantity, voltage, current, frequency, active power, reactive power, etc. of the power system

flow, pressure, cabinet position, temperature, etc. of the power system:

flow, pressure, water level, etc. of the water supply and drainage system

operating parameters of key energy equipment

4 energy management data processing and archiving

this part uses a mature data platform and mainly provides background services such as tag configuration, tag center, tag writer, tag reader, tag buffer, tag initializer, message center, etc

4.1 label

definition:

the process quantity stored in the label center, with the name as the unique mark, such as "2". For detailed description, the tag should also have attributes such as type, source, unit, description, etc

classification:

4.1.1 direct process quantity

quantity received directly from the first level, such as temperature, pressure, flow, valve opening. Periodic acquisition quantity, analog signal, etc., such as temperature, pressure, flow. Switching value, digital (binary) signal, can only be read when the value changes, such as valve status

indirect process quantity, the quantity indirectly calculated by the process system, provides values that cannot be measured directly

1) event tag. It can be seen as combining several single events into high-level process events

2) calculate the label. A more complex process quantity can be obtained by the combination calculation of process quantities

4.2 tag acquisition

based on the flexible c/s mode, the tag center acts as a server to receive and send all process quantities. It receives various process quantities and saves them in memory. When the data is requested, the tag center sends the data to other processes for further processing

when acquiring data, several processes are responsible for sending data to the tag center

when the system starts, each process checks the labels to be processed from the database configuration table, including label scanning cycle, primary position, condition and formula. During operation, the data is sent from the first level and other processes to the label Center for further processing and distribution. The specific division of labor is shown in Table 1

primary communication processor: read the tag name and scanning rate from the database configuration (liopc-tag table), and then send it to the tag center after reading it from the PLC through the OPC server; Tag calculator and event tag generator: first, the tag center sends the necessary calculation input (the configuration of the required data is in the database). The calculation result is sent back to the label center

4.3 data processing and storage

after the data is sent to the label center, other processes can use them, including:

1) primary communication processor. The calculation quantity or model label of the second level can be sent to the first level

2) database writer. Stored in the database, you can write statistics such as maximum, minimum and mean

3) tag memory. Cache the tag historical data for a certain period of time to improve the efficiency of trend display

Figure 2 flow chart of energy data processing

the processing process is still that the process obtains the labels to be processed from the database configuration table at startup. The tag center maintains a subscriber set for each process volume. When the process quantity changes, the subscriber is notified and calculated

5 conclusion

the system provides a networked energy information management platform for production management to centrally monitor, uniformly schedule and balance and optimize various energy media. The principles of reliability, real-time, scalability, security and maintainability are fully considered in the system design process, and advanced and friendly graphical human-machine interface functions are provided, so that users can easily and quickly share various energy data information. (end)