The Four Major Systems Of Photovoltaic Power Generation

It consists of PV modules, grid-connected inverters, loads, bi-directional meters, grid-connected cabinets and power grids. The principle is that the DC power generated by the PV modules is converted into AC power through the inverter, and then supplied to the load and connected to the grid. In this way, the excess electricity can be sold into the grid while satisfying its own load.

Features:

1. Connected to the grid, part or all of the power is uploaded to the grid

2. When the grid goes out, the PV power generation also stops.

3. Still needs utility power at night.

4. No energy storage device.

It consists of PV modules, off-grid inverter, battery, load and so on. Off-grid power generation system can operate independently without relying on the power grid, and is generally used in remote areas, powerless zones, islands, communication base stations and street lights.

When there is light, solar energy is converted into electricity, which is supplied to the load through the off-grid inverter or charged to the battery.

In the absence of photovoltaic, the battery can also be charged through the power grid.

When there is no light or grid outage, the battery power can be fed to AC loads through the inverter.

Features:

1. Independent system that does not rely on the grid. That is, no matter whether there is utility power or not, as long as there is sunlight to satisfy, the off-grid system can work independently, it can provide power independently.

2. There must be energy storage equipment, that is, the battery must be needed, otherwise it can not work at night or rainy days.

3. Can not be connected to the photovoltaic.

Hybrid energy storage systems are widely used in scenarios where there are frequent power outages or where PV self-generation and self-consumption do not allow for surplus electricity to be fed into the grid, or where the price of self-consumption is more expensive than the price of feed-in tariffs.

During the daytime when there is light, the hybrid inverter prioritizes the supply of electricity to the load, the excess electricity is stored in the battery, and at night the battery supplies power to the load through the inverter. At the same time, the charging and discharging times can be set to enable peak and valley adjustment of the electricity price. When the grid is disconnected, the system will automatically switch to off-grid mode to ensure the power supply demand of the users.

Features:

1. Both off-grid and grid-connected system advantages, can be grid-connected to sell electricity, while it can also operate normally when the grid is out of power.

2. In the case of no grid, there must be a battery to run.

3. It can be used as off-grid system without PV connection for peak shaving or emergency power backup.

A power distribution network consisting of distributed power sources (PV/wind/diesel), loads, energy storage systems and control devices. Converts decentralized energy sources into electricity and supplies it locally to local loads.

The microgrid system is an autonomous system capable of self-control, custody and management, and can not only be connected to the external grid, but also operate independently. To a great extent, it solves the problem of grid-connection of distributed power sources, promotes the large-scale access of distributed power sources and renewable energy sources, and is a kind of smart grid system that supplies loads with multiple forms of energy in colleges and universities, and realizes the active power distribution grid.