Main form and advantages and disadvantages of solar power system

1. What is solar energy

Solar energy generally refers to the radiant energy of the sunlight. The polymerization in the sun has a atomic nuclear reaction, and huge energy is not released, and the energy is continuously radiated into the space, which is solar energy. This nuclear fusion reaction in the sun, the full set of Flat Roof Solar Racking System can maintain billions of time to 10 billion years. The radiation power emitted by the sun to the space of the cosmic space is 3.8 * 1023 kW radiation value, of which 200 billion is one in the earth atmosphere. The solar energy reaching the earth atmosphere is reflected by the atmosphere, 23% is absorbed by the atmosphere, and the rest reaches the surface of the earth, its power is 80 million kW, that is, the energy of the sun shot on the earth is equivalent to burning 5 million Tons of coal released heat. The broad solar energy is the source of many energy on the earth, such as wind energy, chemical energy, water potential energy, etc. The narrow solar energy is limited to the light heat, photoelectric and photochemical direct conversion of solar radiation energy.

2, what is solar power

There are two types of solar power generation: one is sun-light power generation (also known as solar light power generation) The other is the solar thermal power generation (also known as solar thermal power generation). Solar light generating is a power generation method that directly converts solar energy into electrical energy. It includes photovoltaic power generation, photochemical power generation, light sensing power generation and photochemical power generation, electrochemically photovoltaic cells, photolylectric electrolyte batteries, and photocatalytic batteries in photochemical power generation.

Solar thermal power generation is to convert solar energy into thermal energy, then convert heat into electric energy, it has two transformation. One is to directly convert solar heat into electrical energy, such as temperature difference power generation of semiconductor or metal material, thermal electrons and thermoelectric electrical electricity, alkali metal thermoelectric conversion, and magnetic fluid, etc. in vacuo devices. Another way is to generate the solar thermal energy (such as a steam turbine) to generate electricity, similar to conventional thermal power generation, but its thermal energy is not from fuel, but from solar energy. Solar heat generating electricity is generally large, and the construction difficulty in engineering is also high, and it is easy to cause light pollution, so it is not within our discussion. Solar light generates adapt to large medium and medium-sized scales, which is the preferred way of our general solar applications.

The figure below shows the typical schematic diagram of the micro-inverter solar power system:

3, the main application form of solar power generation


There are two main solar power generation modes:

1: Net-mesh solar power system; 2: Zoom from the mesh solar power system;

Solar power generation system refers toThe solar power generation system uses the solar panel to convert the solar energy into electrical energy in the case of illumination, power supply is supplied to the load through the solar charge and discharge controller while charging the battery; in the yin weather or no light, through the solar charge and discharge controller by the battery The group is supplied to the DC load, and the battery is also powered directly to the independent inverter, and the AC load is powered by the independent inverter.

The network power generation system is mainly from solar battery packs, battery packs, controllers, etc. If the system involves an AC power device, it is necessary to increase the DC inverter to provide AC 220V. The network power generation system involves a smaller impact because it is completely generated by yourself, so considering that other parameters are small, relatively flexible, but the anti-risk ability and load capacity are smaller.

The mesh type solar power system refers to the solar grid power generation system by converting the solar energy into electrical energy, without battery energy storage, directly passing the grid-connected inverter, putting the electric energy Grid. Solar grid power generation represents the development direction of solar power supply, is the most attractive energy utilization technology in the 21st century.

The mesh-type solar power system has passed several generations of technological updates, and the first centralized solar power system, and the set string of safe optimization is a solar grid system, as well as the current representative of the future direction. Variable solar power system.

The grid power generation system is mainly composed of a solar cell group, a grid-connected inverter group, a photovoltaic cable, and a communication device. The grid-connected power generation system has a centralized large-scale grid-connected power station, which is generally a national power station. The main feature is to directly transfer the generated energy to the grid, and the power grid is unified to supply power to the user. However, this power station has a large investment, the construction cycle is long, and the area is large. It has not been too great to develop. The distributed small and medium-sized grid power generation system, especially the PV building integrated power generation system, due to the small investment, fast construction, small area, policy support, is the mainstream of grid power generation.

3.1 Centralized Solar Power Generation System Centralized inverter: Concentrated inverter Technology is a number of parallel photovoltaic sets of photovoltaic sets to the same centralized inverter DC input, The general power is large, using three-phase IGBT power module, which uses field effect abductor, and uses the DSP conversion controller to improve the quality of the produced electric energy, so that it is very close to the sine wave current, generally used Large photovoltaic power stations (MW) systems.

3.2 String solar power system

String inverter: group string inverter is based on mode-based concept, each photovoltaic group string (1-5 kW By an inverter, there is a maximum power peak tracking at the DC terminal, and the communication network is connected in parallel. Many large photovoltaic plants use group string inverters.

3.3 Micro-inverter Solar Power Generation System

Mini inverter: In the photovoltaic system of the micro-inverter, each of the panels is accessed into a micro-inverter, and one piece in the battery board cannot be good.When working, only this piece will be affected, while other photovoltaic battery boards will run in the best working state, making the system cost, higher overall efficiency, greater power generation, but safer