- Jun 29, 2018 -
According to the different applications, solar photovoltaic power generation system is generally divided into grid generation system, off-grid power generation system, and off-grid energy storage system, grid energy storage system and a variety of energy mix of five kinds of micro network system.
1. Grid-connected power generation system
Photovoltaic (pv) grid system by the component, grid inverter, photovoltaic power meters, load, two-way meters, grid and grid, photovoltaic modules produced by light dc inverter converts alternating current supply load and into the grid.
The grid-connected photovoltaic system mainly has two modes of access to the Internet, one is "self-use, surplus electricity to access the Internet", the other is "full access to the Internet".
General distributed photovoltaic power generation system mainly adopts "spontaneous for private use, yu electrical access to the Internet" mode, solar cells generate electricity priority to load, when the load to burn, redundant into electricity grid, when insufficient power supply load, power grid and pv systems can give the load power supply at the same time.
2. Off-grid power generation system
Off-grid photovoltaic power generation system, which operates independently without relying on the power grid, is commonly used in remote mountainous areas, no-power areas, islands, communication base stations and street lamps.
The system consists of photovoltaic modules, solar controller, inverter, accumulator, load and so on.
The off-grid power generation system converts solar energy into electricity when there is light. The solar energy control inverter is used to power the load and charge the battery. In the absence of light, the battery power the ac load through the inverter.
It is very practical for areas without power grid or areas with frequent power failure.
3. Off-grid energy storage system
And off-grid photovoltaic power generation systems are widely used in the frequent blackouts, spontaneous self-used can't more than surfing the Internet, for private use or pv electricity far more costly than a feed-in tariff, peak electricity prices more expensive than trough electricity price a lot of places.
The system consists of a photovoltaic module, a solar cell, a battery and a load.
The pv square array converts solar energy into electric energy under the condition of light. The solar energy controlled inverter is used to power the load and charge the battery.
In the absence of light, the battery power the solar - controlled inverter and the ac load.
Compared to the system is connected to the grid system, increased the charge and discharge controller and battery, power failure in power grid, photovoltaic (pv) system can also continue to work, can switch into off-grid inverter model, to power a load.
4. Photovoltaic grid-connected energy storage system
Grid-connected photovoltaic power generation system can store excess power generation and improve the proportion of spontaneous self-use.
The system consists of photovoltaic module, solar controller, battery, grid-connected inverter, current detection device, load and so on.
When solar power is less than the load power system by solar energy power supply with power grid, when solar power is greater than the load power, part of solar energy to power a load, part of the controller will be no shortage of electricity storage.
5. Micro-network system
Micro-grid is a new type of power distribution network composed of distributed power supply, load, energy storage system and control device.
The decentralized energy can be converted to electricity in place and then fed to local loads nearby.
The micro grid is an autonomous system capable of self-control, protection and management, which can operate in parallel with the external power grid or in isolation.
Micro grid is an effective combination of multiple types of distributed power to realize multiple energy complementarity and improve energy efficiency.
To fully promote the distributed power and mass access of renewable energy, realize high reliable supply of energy in the form of load, is an effective way to realize active power distribution network, is a traditional grid to make the transition to the smart grid.
The micro grid system consists of photovoltaic module, grid-connected inverter, PCS two-way converter, intelligent switching switch, battery, generator and load.
The photovoltaic module converts solar energy into electricity when there is light, and power is provided to the load by the inverter. Meanwhile, the battery pack is charged by the PCS two-way converter.
In the absence of light, the battery is powered to the load by a PCS two-way converter.