Shanghai Rail Transit Distributed Photovoltaic Power Generation Project Data acquisition case

 

1. Project Background and Requirements

The project is located in Shanghai, corresponding to the rail transit distributed photovoltaic data acquisition project, which belongs to photovoltaic power generation data acquisition. Shanghai Rail Transit Jiangyang North Road Base, Yinhang Base, Jiuting Base, Jiading Race Track Base, Beizhai Road Base, Jianchuan Road Base, Pingzhuang Base, Fujin Road Base and other places have installed wireless meter reading equipment on the State Grid meters on the photovoltaic metering cabinets of Shanghai Metro New Energy Company to realize remote meter reading and platform report display functions.

Demand: According to the requirements of Shanghai Metro New Energy Company, collect and count the data of State Grid photovoltaic meters in photovoltaic cabinets, integrate the data, and do the statistics of monthly power generation parameters of power stations as required to solve the problem of manual calculation and reflect it in platform reports.

Implementation: Starting from November 2023, Zhitao Technology Co., Ltd. will be the implementer and operator, and our company (Digital Collection and IoT) will provide infrared meter data acquisition products (SC-GP-IR4G) and supporting digital collection platforms as the product supplier.

2. Distributed Photovoltaic Meter Data Collection

2.1 Applicable electric meters and data collection products

Adapt to the State Grid protocol (614/645 protocol, 698 protocol), and install and implement the infrared acquisition method.

 

 

 

 

 

 

 

 

 

 

 

 

 

SC-GP-IR4G wireless infrared meter reading terminal is a universal electric meter and gas meter reading terminal based on infrared communication, 4G wireless transmission, and DC wide voltage power supply launched by Shanghai Shucai Internet of Things Technology Co., Ltd. It can collect electric energy data, voltage, current, power factor and other electrical parameter data of State Grid electric meters (supporting 645 and 698 protocols).

Brief introduction to the principle of infrared meter reading: The infrared photoelectric probe reads the parameter information of the smart meter regularly through the infrared optical port and uploads it. The infrared meter reader has the function of infrared signal modulation and demodulation, modulates the binary digital signal into a pulse sequence with a frequency of 38KHz, and drives the infrared emitting diode to send it out in the form of infrared light pulses; the transceiver converts the received light pulse into an electrical signal, and then sends it to the demodulation circuit for demodulation after amplification, filtering and other processing, and restores it to a binary digital signal. After message parsing, it is sent to the server in a specified format (such as json).

The wireless infrared meter reading terminal supports the use of 4G communication, which greatly simplifies the on-site deployment time and reduces the construction cost. This terminal supports meter reading scenarios of various meters, gas meters and other instruments with infrared communication interfaces, and is suitable for electric energy meter data collection, smart city data collection, power monitoring data collection, energy conservation and emission reduction data monitoring system data collection, energy consumption monitoring system data collection, photovoltaic system data collection, intelligent monitoring data collection, robot data collection, smart security system data collection, cloud platform system data collection; electric energy meter calibration and inspection test bench; especially suitable for photovoltaic power generation system electric energy meter reading and power supply bureau state grid electric energy meter total meter lead seal is completely closed, and no seal can be opened.

2.2 Electricity data collection implementation process

Products include: adapter, 4G intelligent acquisition terminal, infrared probe (with 3M glue), 4G suction cup antenna

 

 

 

 

 

 

 

 

2.2.1 Factors affecting the implementation of electricity meter data collection and installation

1) Whether the electric meter is of the State Grid protocol, whether it has an infrared communication port, and whether the infrared communication port is far infrared (if there is a near infrared communication port, it can be implemented, but the infrared probes used are different).

2）Signal impact: The environment where the meter is located, the underground distribution box (basement), the impact on the 4G signal (no signal, unable to transmit). For sealed iron boxes, the antenna needs to be extended and pulled out.

3）Power supply: 220VAC AC or 12VDC DC must be available on site.

4）The infrared probe should be installed close to the infrared communication port. If the meter cabinet cannot be opened, it can be installed through transparent glass. If there is no transparent glass and it cannot be installed close to the meter, the infrared communication collection method will not be implemented.

2.2.2 Infrared installation steps

Step 1: Check the photos of the electric energy meter to determine whether it has the far infrared communication function. If it has a far infrared communication window, it can be implemented . As shown in the following figure:

 

 

 

 

 

 

 

 

Electric meter infrared reading window

Step 2: Aim the infrared probe at the infrared window of the meter, with a distance of 0 to 5 meters, visible, and an angle less than 5 degrees, even through transparent glass. As shown in the figure below

 

 

 

 

 

 

One is to directly aim the infrared probe at the infrared window of the meter for better reception ( it is recommended to install

Installation method ) .

 

 

 

 

 

 

 

 

 

 

The infrared probe is directly attached to the electric meter (for example)

Another method is to stick it on the glass outside the infrared window of the meter when the meter cabinet door cannot be opened, as shown in the following figure:

 

 

 

 

 

 

 

 

 

 

Infrared probe attached to the outside of the glass (example)

三、Implementation display and status monitoring

 

From November 2023 to now, it has been in use for more than half a year . Through operating temperature monitoring, the operating condition is good during use and no adverse conditions have occurred.

四、Platform data acquisition results display