CN202276195U - Web-based photovoltaic grid-connected power generation remote monitoring system - Google Patents

Abstract

The utility model discloses a remote monitoring system for photovoltaic grid-connected power generation based on the web. The outputs of the temperature measurement unit and the illumination measurement unit are connected to an A/D conversion module, and the A/D conversion module and the DSP processing module are bidirectionally connected; the voltage acquisition unit and the The output of the current acquisition unit is connected to the power acquisition and processing module. The DSP processing module is bidirectionally connected to the power acquisition and processing module through the dual-port RAM transmission module. The output signal of the power acquisition and processing module is input to the ARM9 data management and communication module through the dual-port RAM transmission module. ; The output of the ARM9 data management and communication module is uploaded to the database server through the data storage module and Ethernet in turn, and the database server is bidirectionally connected with the client through the web server. The utility model realizes remote viewing, improves the automatic management of the power station, saves a lot of manpower and material resources, improves work efficiency, and contributes to the popularization and promotion of photovoltaic grid-connected power generation systems; at the same time, it has wider coverage, stronger practicability, and lower cost Low.

Description

Web-based remote monitoring system for photovoltaic grid-connected power generation

technical field

The utility model relates to a remote power station operating state monitoring system based on an embedded operating system, in particular to a web-based remote monitoring system for a photovoltaic grid-connected power station.

Background technique

Large-scale grid-connected power generation of distributed new energy is an effective way to solve the current power supply shortage and environmental pollution problems. Rational development and utilization of distributed new energy sources and reducing the pressure of external energy dependence are of great significance to improving the power structure of my country's power system and realizing the sustainable development of energy sources. At present, the monitoring devices for photovoltaic power generation systems at home and abroad are mainly for the control and operation of photovoltaic power generation systems, the detection of the status of photovoltaic arrays and inverters, and the collection and communication transmission of internal data of photovoltaic power plants. Since the operation of large-scale photovoltaic power plant groups is generally carried out unattended, it is very difficult and cumbersome to monitor, operate, control and maintain widely distributed photovoltaic power plant equipment, requiring a lot of manpower, material and financial resources .

Some photovoltaics (or new energy grid-connected power stations) adopt methods such as RS485 and CAN bus to form a network in order to realize information sharing and data exchange. This method not only has limited coverage of the network, but also is extremely inconvenient to maintain and manage.

Utility model content

Aiming at the deficiencies in the prior art, the purpose of this utility model is to provide a remote monitoring system for photovoltaic grid-connected power generation with wider coverage, stronger practicability and low cost.

In order to achieve the above purpose, the technical solution adopted by the utility model is as follows: a web-based photovoltaic grid-connected power generation remote monitoring system, which includes a temperature measurement unit, an illuminance measurement unit, and a voltage acquisition unit for collecting three-phase and neutral point voltages. The unit and the current acquisition unit for collecting three-phase and neutral wire currents, the output of the temperature measurement unit and the illumination measurement unit are connected to the A/D conversion module, and the A/D conversion module (through the 485 interface) is bidirectionally connected to the DSP processing module; The output of the voltage acquisition unit and the current acquisition unit is connected to the power acquisition and processing module, the DSP processing module is bidirectionally connected to the power acquisition and processing module through the dual-port RAM transmission module, and the output signal of the power acquisition and processing module is input through the dual-port RAM transmission module ARM9 data management and communication module; the output of the ARM9 data management and communication module is uploaded to the database server through the data storage module and Ethernet in turn, and the database server is bidirectionally connected to the client through the web server.

The monitoring system also includes an input module and an output module, the output of the input module is connected to the power collection and processing module, and one output of the power collection and processing module is connected to the output module.

The A/D conversion module adopts AD7606 digital-to-analog conversion chip. The DSP processing module adopts the DSP processor of TMS320C6747 chip.

The monitoring system also includes a keyboard, the output of the keyboard is connected to the input of the ARM9 data management and communication module, and the output of the ARM9 data management and communication module is connected to the display module at the same time.

Beneficial effects of the utility model: the utility model uses the power collection and processing module to collect the voltage and current signals of the photovoltaic power station and the public coupling node online in real time, as well as the natural environment (illumination intensity and temperature) at the new energy power station, and calculates the various parameters of the photovoltaic power station. According to the real-time calculation results of various indicators in the measurement process, the monitoring indicators in the monitoring time period are obtained through statistical analysis, and then compared with the specified limit values and corresponding alarm signals are issued. At the same time, record the long-term operation data and historical alarm events of grid-connected photovoltaic power plants, conduct online monitoring and statistics on the operation status of photovoltaic grid-connected power generation systems, realize remote viewing in Browse/Server mode, improve the automatic management of power plants, and save a lot Human and material resources, improve work efficiency, and contribute to the popularization and promotion of photovoltaic grid-connected power generation systems.

Compared with the prior art, the utility model also has the following advantages:

1. Make full use of the existing optical fiber ring network of the power supply bureau, the cost of hardware development, expansion and installation is low, and the maintenance is convenient.

2. A new type of microprocessor based on the embedded real-time operating system and graphical user interface ARM9 hardware platform is adopted, which has the characteristics of strong processing capability, high real-time performance, and easy upgrade, etc., and provides a good foundation for the realization of the new energy grid-connected power station monitoring system A new way.

3. The system adopts a fully embedded design method, in which the evaluation software adopts an open-source Linux embedded real-time operating system, and the measurement platform adopts ARM9, ARM7 and DSP to form a multi-CPU system, which greatly improves the reliability of the measurement control unit and has Strong reliability, network communication capability and scalability.

4. The strong and weak current arrangement of the device is completely separated, which can greatly reduce the coupling of external electromagnetic interference on the weak current side, enhance the anti-interference ability of the device, and ensure the continuous operation stability of the system and the safety and reliability of recorded data.

5. It can display data in real time and has a storage function, which is convenient for data query and management; any computer in the network can use a browser to query or export real-time and historical data. In addition, according to the monthly statistical report and annual statistical report, the aging problem and the medium and long-term impact of the local weather conditions on the operation of the power station can be further statistically studied.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the web monitoring structural diagram of the present utility model;

Detailed ways

The utility model is described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Figure 1 is a structural block diagram of the utility model, as shown in the figure, the utility model is based on the web-based photovoltaic grid-connected power generation remote monitoring system, including power collection and processing module, temperature measurement unit, illuminance measurement unit, used to collect three-phase and The voltage acquisition unit for the neutral point voltage and the current acquisition unit for collecting three-phase and neutral current; the output of the temperature measurement unit and the illuminance measurement unit are connected to the A/D conversion module, and the A/D conversion module communicates with the DSP through the 485 interface The processing module is bidirectionally connected; the output of the voltage acquisition unit and the current acquisition unit are connected to the power acquisition and processing module, the DSP processing module is bidirectionally connected to the power acquisition and processing module through a dual-port RAM transmission module, and the output signal of the power acquisition and processing module is passed through the dual-port RAM transmission module. The port RAM transmission module inputs the ARM9 data management and communication module; the output of the ARM9 data management and communication module is uploaded to the database server through the data storage module and Ethernet in turn, and the database server is bidirectionally connected to the client through the web server.

Description of the working process of the utility model: the temperature and illuminance signals measured by the temperature measurement unit and the illuminance measurement unit are converted into digital signals through the A/D conversion module, 485 interface and DSP processing module, and the power is input through the dual-port RAM transmission module The acquisition and processing module performs calculation and processing; the power acquisition and processing module calculates and processes the three-phase and neutral point voltage, three-phase and neutral line current collected by the voltage acquisition unit and the current acquisition unit at the same time, and the obtained signals pass through the dual-port The RAM transmission module is input to the ARM9 data management and communication module; the ARM9 data management and communication module stores the corresponding data in the data storage module, and the data in the data storage module is uploaded to the data server via Ethernet (through the RJ45 interface).

As shown in Figure 1, the monitoring system also includes a drive-in module and a drive-out module, which are optional units. The input signal is connected to the power acquisition and processing module through the input module, and one output of the power acquisition and processing module is connected to the output module. The input module transmits data to the ARM9 data management and communication module through the dual-port RAM transmission module from the subsequent power acquisition and processing module. The output module is used to execute the action command issued by the ARM9 data management and communication module. The command is input to the output module through the dual-port RAM transmission module and the power acquisition and processing module, thereby outputting the output signal.

As shown in Figure 1, the monitoring system also includes a keyboard, the output of the keyboard is connected to the input of the ARM9 data management and communication module, and the output of the ARM9 data management and communication module is connected to the display module LCD at the same time.

As an embodiment, the A/D conversion module adopts AD7606 digital-to-analog conversion chip. The DSP processing module adopts the DSP processor of TMS320C6747 chip.

Fig. 2 is a structural diagram of the web monitoring system of the present invention. As shown in the figure, the web monitoring system structure is divided into three parts, namely the on-site layer subsystem, the middle layer subsystem and the customer subsystem, and the three subsystems are all capable of two-way information exchange . Among them, the visual monitoring equipment that constitutes the on-site layer subsystem is the remote monitoring system. This system is responsible for measuring and recording the power quality indicators, basic power, transient and steady-state events of the photovoltaic grid-connected power station, and through the LCD Real-time display; middle layer subsystem includes database server and web server. After the field layer subsystem uploads the data to the database server through Ethernet, the database server classifies and counts the data, and provides data query, index, update and multi-user access control functions. The web server provides web page browsing service, realizes the corresponding functions according to the user's request content, realizes the viewing of the on-site layer subsystem, and can perform data export, report generation, and waveform drawing functions through the web page. In this utility model, the client subsystem refers to the client's PC and its browser tool, which is responsible for sending user requests and receiving and storing corresponding responses.

The utility model adopts a fully embedded structure, and consists of a multi-CPU system composed of ARM9 processor, ARM7 processor and DSP processor, combined with the environmental parameters of the photovoltaic power station, and comprehensively detects its operating parameters, including: active power, reactive power, apparent Power, voltage, current, light intensity, ambient temperature and various power quality indicators, including: current harmonics, voltage harmonics, voltage deviation, frequency deviation, and current three-phase unbalance. Voltage three-phase unbalance, voltage fluctuation, voltage flicker, voltage swell, voltage sag. And the monitoring data is uploaded to the database server via Ethernet, which can be accessed in real time by Brower/Server.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present utility model without limitation. Although the utility model has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the utility model can be Modifications or equivalent replacements of the technical solutions without departing from the purpose and scope of the technical solutions of the utility model shall be covered by the claims of the utility model.

Claims (6)

1. based on the parallel network power generation remote supervision system of web; It is characterized in that: it comprises temperature measurement unit, illumination photometry unit, be used to the current acquisition unit gathering the voltage acquisition unit of three-phase and neutral point voltage and be used to gather three-phase and neutral current; The output of temperature measurement unit and illumination photometry unit connects the A/D modular converter, and the A/D modular converter is connected with the DSP processing module is two-way; The output of said voltage acquisition unit and current acquisition unit connects electric quantity acquisition and processing module; The DSP processing module is connected with electric quantity acquisition and processing module are two-way through the dual port RAM transport module, and electric quantity acquisition and processing module output signal are via input ARM9 data management of dual port RAM transport module and communication module; The output of ARM9 data management and communication module is uploaded to database server through data memory module and Ethernet successively, and database server is connected with client is two-way through the web server.

2. the parallel network power generation remote supervision system based on web according to claim 1; It is characterized in that: this monitoring system also comprise open into module with leave module; The output of opening into module connects electric quantity acquisition and processing module, and one tunnel output of electric quantity acquisition and processing module connects leaves module.

3. the parallel network power generation remote supervision system based on web according to claim 1 is characterized in that: said A/D modular converter is connected with the DSP processing module is two-way through 485 interfaces.

4. the parallel network power generation remote supervision system based on web according to claim 1 is characterized in that: said A/D modular converter adopts the AD7606 analog-digital chip.

5. the parallel network power generation remote supervision system based on web according to claim 1 is characterized in that: said DSP processing module adopts the dsp processor of TMS320C6747 chip.

6. the parallel network power generation remote supervision system based on web according to claim 1; It is characterized in that: this monitoring system also comprises keyboard; The output of keyboard connects the input of ARM9 data management and communication module, and said ARM9 data management is connected with display module with the output of communication module simultaneously.

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