Distributed photovoltaic

2024-08-01

Distributed photovoltaic power generation is a new type of power generation and comprehensive energy utilization method with broad development prospects.

The principle of nearby utilization: advocating nearby power generation, nearby grid connection, nearby conversion, and nearby use can not only effectively increase the power generation of photovoltaic power plants of the same scale, but also reduce the loss of electricity in boosting and long-distance transportation.

Equipment composition: The basic equipment includes photovoltaic cell modules, photovoltaic a-rray brackets, DC combiner boxes, DC distribution cabinets, grid connected inverters, AC distribution cabinets, etc. In addition, there are power supply system monitoring devices and environmental monitoring devices.

Operation mode: Under the condition of solar radiation, the solar cell module a-rray converts solar energy into output electrical energy,  which is centrally sent to the DC distribution cabinet through the DC combiner box. The grid connected inverter inverts the AC power to supply the building's own load, and the excess or insufficient power is regulated by connecting to the power grid.

Output power: relatively small, generally speaking, the capacity of a distributed photovoltaic power generation project is within a few kilowatts. However, the size of photovoltaic power plants has little impact on power generation efficiency, and the investment return rate of small photovoltaic systems is not lower than that of large ones

Environmental benefits: During the power generation process, there is no noise and no pollution to the air and water.

Relieve electricity shortage: It can alleviate local electricity shortage to a certain extent, but due to the relatively low energy density and limited roof area suitable for installing photovoltaic modules, it cannot fundamentally solve the problem of electricity shortage.

Coexistence of power generation and consumption: Unlike large-scale ground power stations that only operate as power generation stations by boosting power generation and connecting to the transmission network, distributed photovoltaic power generation is connected to the distribution network, where power generation and consumption coexist, and requires local consumption as much as possible.

Distributed photovoltaic power generation systems have a wide range of applications and can be built in rural, pastoral, mountainous areas, and near developing large, medium, and small cities or commercial areas to meet the electricity needs of local users. According to different design, construction, and installation methods, distributed generation systems can be divided into BAPV forms, which install photovoltaic modules on existing buildings, and BIPV forms, which use photovoltaics as part of buildings and have both building and power generation functions. Currently, BAPV is the main form of distributed photovoltaic projects in China.