Why Do We Need on Grid Inverter?

The on grid inverter are generally used in the system of large photovoltaic power stations. Many parallel photovoltaic strings which has been connected to the DC input of the same centralized inverter. That is to say, three-phase IGBT power modules will be used for higher power. The small ones use field effect transistors and DSP conversion controller to improve the quality of the generated electric energy, making it very close to the sine wave current. The on grid inverters are generally divided into photovoltaic power generation on grid inverters, wind power on grid inverters, power equipment power generation on grid inverters and other power generation equipment power generation on grid inverters. The biggest feature of the on grid inverter is the high power and low cost of the system.

• How to use on grid inverter?

• What is the difference between a photovoltaic on grid inverter and a medium voltage on grid inverter?

• What are the steps of using on grid inverter?

How to use on grid inverter?

1. The on grid inverter can be put into use only after obtaining the permission of the local power department and the professional and technical personnel have completed all the electrical connections.

2. Before any maintenance work on the on grid inverter, the electrical connection between the inverter and the grid should be disconnected first, and then the electrical connection on the DC side should be disconnected.

3. Wait at least 5 minutes until the internal components of the on grid inverter are discharged before proceeding with maintenance work.

4. Any fault that will affect the safety performance of the grid-connected inverter must be eliminated immediately before the inverter is powered on again.

5. Avoid unnecessary contact with the circuit board in the on grid inverterr.

What is the difference between a photovoltaic on grid inverter and a medium voltage on grid inverter?

The difference is that the current is large when the low voltage is connected to the grid, and the current is relatively small when the medium voltage is connected to the grid. The second is the low voltage ride-through parameter setting. All converters have low voltage ride-through function settings. The low-voltage ride-through range needs to be designed according to project requirements, grid connection requirements and actual conditions). The voltage ride-through range of low-voltage grid-connected is less than medium voltage, and the parameter settings are not sensitive and complicated. That is the difference between a photovoltaic on grid inverter and a medium voltage on grid inverter.

What are the steps of using on grid inverter?

The on grid inverter can be used directly off-grid, because grid-connected inverters can be used directly as off grid inverters.

The on grid inverter can directly transmit energy to the grid, so it needs to track the frequency and phase of the grid, which is equivalent to a current source. An off grid inverter is equivalent to establishing an independent power grid. Its main function is to control its own voltage, which is a voltage source in itself. on grid inverters do not require energy storage, but the energy cannot be controlled. Off grid inverters require energy storage, but they do not deliver energy to the grid.

If you feel that the above cannot completely solve your doubts about the grid-connected inverter, please contact Shenzhen Sumry Electronics Co., Ltd. They will be very happy to answer your questions!