Different from the large-scale centralized grid-connected photovoltaic power station, the design of the grid-connected photovoltaic power generation system on the roof of the building is limited by the available area for installing photovoltaic modules, and the first consideration is different.
In addition, the grid connection point of the grid-connected solar photovoltaic power generation system installed on the building is generally on the distribution side (400V, 230V, lokV) of the power grid, which belongs to the distributed generation system. Its characteristics are: ① The grid connection point is on the distribution side: ②The current is bidirectional, and it can take electricity from the grid or send it to the grid: ③Most photovoltaic power is directly consumed by the load and used by itself; ” (parity system). It is different from large-scale centralized photovoltaic power plants connected to the grid on the transmission side (35kV, 50kV, 110kV and above).
Rooftop photovoltaic systems are classified as follows:
(1) Classification according to whether it is connected to the public power grid
①Grid-connected photovoltaic system.
② Off-grid photovoltaic system.
(2) Classification according to whether there is an energy storage device
① A system with an energy storage device;
②The system without energy storage device.
(3) Classification according to the packaging form of its solar cell modules
①Building-material photovoltaic system:
② component type photovoltaic system;
③ Installed photovoltaic system.
Generally speaking, Building Integrated Photovoltaic (BlPV) refers to the coordination and organic combination of photovoltaic system and building function and appearance, including BAPV. Three different photovoltaic modules are used in BIPV design and installation.
①Material Photovoltaic Module (Material Photovoltaic Module) combines solar cells with building materials such as tiles, bricks, coils, glass, etc. to become inseparable building components or building materials, such as photovoltaic tiles. Photovoltaic bricks, photovoltaic roofing membranes, glass photovoltaic curtain walls, photovoltaic lighting roofs, etc.
② Elemental Photovoltaic Module (Elemental Photovoltaic Module) is a photovoltaic module that is combined with building components or becomes a building component independently. For example, standard ordinary photovoltaic modules or photovoltaic modules customized according to building requirements constitute awning components, sunshade components, and railing components. Wait.
③Installed photovoltaic modules (Building Atrached Photovoltaic Module) The photovoltaic modules installed overhead on the roof or wall are almost the same as those installed on the ground. The combination of photovoltaics and buildings can be divided into the following forms:
●Using ordinary solar cell modules, which are installed on the original building materials of the sloping roof;
●Using special solar cell modules, which are installed on sloping roofs as building materials; ·Using ordinary solar cell modules, which are installed on the original building materials of flat roofs;
●Using special solar cell modules to be installed on flat roofs as building materials: ·Using ordinary or special solar cell modules to be installed on the south façade as a curtain wall: ·Using special solar cell modules to be installed on the south façade as a building curtain wall superior;
●Using special solar cell components, which are installed on the skylight as the skylight material:
●Using ordinary or special solar cell components to be installed on buildings as sun visors.