This paper gives a brief introduction to the Acrel-2000 v8.0 photovoltaic power generation monitoring system used in the Inner Mongolia Minghua project.
Yang Junjun
Ankerui Electric Co., Ltd., Shanghai Jiading
0 Preface
The distribution of solar energy resources is related to latitude, altitude, natural geography and climatic conditions. The total radiation and sunshine hours of Tibet, Qinghai, Xinjiang, Gansu, Ningxia and Inner Mongolia are the highest in the country, and it is one of the regions with abundant solar resources in the world. Photovoltaic power generation sites must have good lighting conditions and no shelter. Due to this characteristic, the area of ​​photovoltaic power generation is large. The real-time collection of parameters such as current and voltage during the normal operation of the PV system is a key to the PV system. If manual inspection is used, it takes time and effort, and the collected data has a certain time difference, which cannot objectively reflect the entire system. The overall operating state of the mode time point. Therefore, a set of intelligent background power monitoring equipment is very important.
The smart meter is installed on the important photovoltaic power generation equipment and system nodes, and the voltage, current and other electrical parameters of the equipment are collected by the smart meter. The background monitoring system collects the electrical parameters of each item of the smart meter through the data acquisition device, and displays and stores the real-time display and storage from the system host. ,deal with. Real-time monitoring of the entire photovoltaic power generation system through intelligent equipment, through the accumulation, analysis, formulation and adoption of appropriate operation and maintenance plans for real-time operating parameters of the photovoltaic power generation system. It can be seen from the above that the photovoltaic power generation monitoring system is of great significance to the user's reliable, safe and real-time maintenance of the photovoltaic system. Build a smart photovoltaic power generation maintenance system, comprehensively use smart meters and intelligent monitoring and management terminal equipment to achieve efficient, scientific and reasonable maintenance purposes.
The Acrel-2000 v8.0 photovoltaic power generation monitoring system is the management side photovoltaic power generation monitoring system developed for the above trends. The system monitors some important equipments of Inner Mongolia photovoltaic power generation system in real time, monitors the power parameters of the collector during operation by real-time monitoring of the running status of the monitoring loop, and stores and analyzes the entire metering system in the form of a table or a graph. The situation, find out the fault point of the system operation, in order to improve the maintenance efficiency, the user provides accurate data support in real time to master the system operation status.
This paper takes Inner Mongolia Minghua Photovoltaic Power Generation Project as an example to briefly introduce the application of Acrel-2000 v8.0 photovoltaic power generation monitoring system in Inner Mongolia Minghua Photovoltaic Power Generation Project.
1 project introduction
The project is located in Minghua, Inner Mongolia. The project has installed a total of 80,000 pieces of 250Wp polycrystalline silicon photovoltaic modules with a total installed capacity of 20.0MWP. The photovoltaic modules of this project are connected in series with 20 pieces of components, designing 38 sets of 500KWP photovoltaic inverters, 19 sets of 1000KVa box-type transformers, and 264 sets of combiner boxes, of which 226 sets are 16 in 1 and 1 out, 38 out of 12 in 1 out.
In the early stage of the project, the PV monitoring system is designed for its 2MWP. Real-time monitoring is realized by collecting various power equipments in the photovoltaic power generation system. The data is collected, stored and processed. The operation status of the equipment in the monitoring area is displayed in real time in the form of various graphic reports. All the data is stored in the system background host. Through the analysis of the data for a fixed period of time, the operation status of the entire photovoltaic power generation system is mastered, and a reasonable maintenance plan and daily inspection are established for the current power generation efficiency.
This project is mainly for real-time monitoring of equipment such as combiner box, inverter and environmental monitor in photovoltaic power generation system.
There are a total of 27 combiner boxes to be monitored in the photovoltaic power generation system of this project, 2 inverters and 1 environmental monitor.
The Acrel-2000 v8.0 photovoltaic power generation monitoring system collects the data of the power equipment in the photovoltaic power generation system, the power generated by each loop of the combiner box, the data on both sides of the inverter's inverter, and the environmental monitor. Temperature and humidity, wind speed, irradiance and other data, the above data is displayed in real time through the interface, and the power generation is divided into annual, monthly, and daily reports, which provides managers with reliable assessment of the power generation efficiency of the entire photovoltaic power generation system. Data basis.
2 user needs
â— Real-time refresh of equipment data such as combiner box, inverter, and environmental monitor, and display it dynamically in a single graph. Displayed on each loop sub-screen, and information such as the name of the loop.
â— Produce a report on the annual, monthly and daily power generation of the photovoltaic power generation system. The report can be exported and printed.
â— Convert the amount of electricity generated into the emission of harmful gases such as standard coal, reduced carbon dioxide, and sulfur dioxide.
â— Over-limit alarm for each power generation circuit of the combiner box, set the over-limit alarm for the specific circuit of the customer
â— The power collection function of each loop, and automatically generate the electricity parameter report that meets the customer management requirements.
â— Alarm event record, which is convenient for maintenance personnel to maintain the circuit according to the nature of the event.
â— User rights management, different levels of rights to achieve different levels of operation.
3 design
3.1 Reference Standard
The system is designed to meet the manufacturing and testing standards listed below:
JGJ/T 16-92 "Electrical Design Code for Civil Buildings"
GB/J63-90 "Design Specification for Electrical Measuring Instruments for Electrical Installations"
GB/T13730 "General technical conditions for regional grid data acquisition and monitoring systems"
GB2887 "Technical Requirements for Computing Station Sites"
GB/50198-94 "Technical Specifications for Monitoring System Engineering"
DL/T 698.31-2010 Part 3.1: Technical Specifications for Power Information Collection Terminals - General Requirements
DL/T 698.35-2010 Part 3-5: Technical specification for power information collection terminal - Particular requirements for low-voltage centralized meter reading terminal
DL/T 698.41-2010 Part 4-1: Communication Protocol - Communication between the primary station and the energy information collection terminal
DL/T 698.42-2010 Part 4-2: Communication Protocols - Concentrator Downlink Communication Protocol
DL/T/814-2002 "Functional Automation System Functional Specifications"
3.2 system architecture design
In view of the scale and nature of the construction of the photovoltaic power generation project in Inner Mongolia and the nature of the joint development of the follow-up projects, the system department of Ankerui Electric Co., Ltd. monitors the project according to the needs of users and the experience in the same nature project. The following design is adopted: through testing, the equipment used in the photovoltaic power generation system adopts the standard Modbus-RTU protocol. The related equipment installed on the site is connected by hand through the shielded twisted pair cable, and the data bus is connected to the data collector installed in the field. The data collector transmits the data to the background host in the duty room through the optical fiber. System diagram 1 is shown.
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figure 1
4 system function
The upper computer software adopts Acrel-2000 v8.0 photovoltaic power generation monitoring system, and completes the functions of software monitoring and power monitoring in the upper computer through equipment configuration, database variable configuration and interface design.
4.1 Features
Acrel-2000 v8.0 photovoltaic power generation monitoring system adopts full Chinese interface, which is easy to operate and stable and reliable. Click the corresponding shortcut button to enter the corresponding system function module; the system has a system diagram display, simulation diagram display and network structure diagram display; the system has a friendly man-machine interface, and the display data is intuitive and convenient for users to consult.
4.2 Software Features
4.2.1 Initial interface
The software interface can be designed according to the characteristics of the project and the requirements of the customer. The interface is shown in Figure 2.
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Figure 2 login interface
4.2.2 Communication diagram
The communication diagram is a topology diagram showing whether the communication between the system and the instrument is normal. The change of the color of the interface module reflects the running status of each monitoring point of the entire system. The interface is shown in Figure 3.
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Figure 3 Communication
4.2.3 Monitoring details
The monitoring details reflect the name of the entire system distribution circuit, the corresponding distribution system, and the main electrical parameters of the circuit. Through the display of real-time data, the operation data of each monitoring loop of the project is visually reflected, which is convenient for the manager to know the running status of the system in real time. The interface is shown in Figure 4.
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Figure 4 Monitoring details
4.2.4 Parameter meter reading
The parameter report reflects the operational data of the monitoring loop of the project at a certain point in time, and the real-time parametric data at a current or past time point reflects the loop status. The interface is shown in Figure 5.
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Figure 5 Parameter reading
4.2.5 Trend curve
The trend curve can query each loop voltage, power load trend, view its historical trend line; help users enter the line trend analysis and fault recall. The load curve interface is shown in Figure 6.
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Figure 6 trend curve
4.2.6 Real-time alarm
The system also targets the telemetry of the main electrical parameters (including the current, voltage, frequency, power factor of the incoming loop and the current crossing alarm of the outgoing loop). You can also click to open the history alarm to call up the historical alarm interface. The interface is shown in Figure 7.
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Figure 7 real-time alarm
5 Conclusion
The application of the Acrel-2000 v8.0 photovoltaic power generation monitoring system introduced in Inner Mongolia Minghua project can realize real-time monitoring of various equipments in Inner Mongolia Minghua Photovoltaic Power Generation System, which can not only display equipment operation status, but also measure power generation. , limit alarms and other functions. At the same time of system design, installation and commissioning, it is also a detailed combing of the whole power generation system. The design conforms to the system topology diagram of the site and the related software interface, which is convenient for the administrator to quickly grasp the running state of the whole system. The system also converts photovoltaic power generation into standard coal and related parameters such as carbon dioxide emissions. The system operates safely, reliably and stably, and provides accurate data basis for the management of photovoltaic power generation managers and fault tracing.
references
[1]. Ren Zhicheng Zhou Zhong. Principles and Application Guidelines of Power Electrical Measurement Digital Instrumentation [M]. Beijing. China Electric Power Press. 2007. 4
[2]. Zhou Zhong. Application of power meter in electric energy metering of large commercial hotels [J]. Modern Building Electric 2010. 6
About the author: Yang Junjun, female, undergraduate. Position: Now working for Ankerui Electric Co., Ltd., contact number, mobile phone, QQ
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