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Shanghai Sannanhong Electric Co., Ltd
Date: 2024-01-25Read: 8
| Project Name | Chint Solar Rooftop Photovoltaic Power Generation Project |
| Project location: | Wenzhou, Zhejiang |
| Functional nature: | Measuring direct current energy |
| Abstract: | Distributed photovoltaic power generation specifically refers to photovoltaic power generation facilities that are built near user sites, operate in a way that allows users to self consume and surplus electricity to be connected to the grid, and are characterized by balanced regulation in the distribution system. It is a new type of comprehensive utilization of power generation and energy with broad development prospects. It advocates the principles of nearby power generation, nearby grid connection, nearby conversion, and nearby use, which can not only effectively increase the power generation of photovoltaic power plants of the same scale, but also effectively solve the problem of power loss in boosting and long-distance transportation. The development of distributed photovoltaic power generation is of great significance for optimizing energy structure, achieving the "dual carbon goal", promoting energy conservation and emission reduction, and achieving sustainable economic development. |
| Overview: | Photovoltaic power generation has significant energy, environmental and economic benefits, and is one of the green energy sources. Installing a 1 kW photovoltaic power generation system under average sunshine conditions in China can generate 1200 kWh of electricity per year, reduce coal (standard coal) consumption by about 400 kg, and reduce carbon dioxide emissions by about 1 ton. According to the research results of the World Wildlife Fund, in terms of reducing carbon dioxide emissions, installing a 1 square meter photovoltaic power generation system is equivalent to planting 100 hectares of trees. Currently, the development of renewable energy such as photovoltaic power generation is one of the effective means to fundamentally solve environmental problems such as haze and acid rain. The scale of this construction is 20000 kilowatts of distributed photovoltaic power generation. The principle of electricity settlement for this project is: self use and surplus electricity connected to the grid. The project is scheduled to be completed and put into operation by the end of May 2024, with an average annual power generation of approximately 24 million kilowatt hours after the project is put into operation. All projects from the photovoltaic power station of the heavy industry enterprise to the public connection point (switch 904 of the first switching station, switch 921 of the third switching station, and non 15 poles of the 10KV II circuit 955 line Xincheng branch line) are invested and constructed; Install A-level power quality online monitoring devices at the 901 switch of the first switching station, the 921 switch of the third switching station, the non-15 pole of the 10kV II circuit 955 line of the Xincheng branch line, and three grid connection points in the photovoltaic distribution room of the heavy industry enterprise; The first switching station 901 switch, the third switching station 921 switch, the 10kV II circuit 955 new city branch line non 15 pole, the metering meters in the distribution room of the heavy industry enterprise, and the photovoltaic power generation metering meters provided by the power supply company are installed at the three grid connection points in the photovoltaic switching room of the heavy industry enterprise. Smart meters are divided into three parts in the entire system. One part is connected between the inverter and the household load, mainly used to measure the total power generation of the photovoltaic system. The second part is connected between the household load and the State Grid meter, mainly used to measure the amount of electricity on and off the grid. When the electricity generated by photovoltaics cannot be fully consumed by users, the remaining electricity transmitted to the grid is recorded as negative power or negative energy; When photovoltaic power generation cannot meet the needs of users to purchase electricity from the grid, it is recorded as positive power or positive energy. The inverter will obtain this data through 485 communication, and then adjust the power generation efficiency or send electricity to the energy storage battery based on this data to achieve the function of preventing backflow. The last part of the electricity meter adopts a DC meter, installed between the inverter and the battery, mainly used to measure the charging and discharging data of the energy storage module. In the context of "dual carbon", with the widespread construction of distributed new energy, high penetration distributed photovoltaics will inevitably generate voltage problems after being connected to the distribution network. Therefore, in promoting the integration of distributed photovoltaics into the grid, a safe and reliable distributed photovoltaic monitoring system solution is needed to assist users and the power grid in achieving a high proportion and orderly integration of distributed photovoltaics, strengthen the unified control of distributed photovoltaics, promote the coordinated operation of distributed photovoltaics and the power grid, and build a new distributed new energy dispatch and management system with transparent data, convenient regulation, and energy interaction. |
