Solar power generation overvoltage load limit

How does a photovoltaic system work in power limit mode?

The PV works in power limit mode, and the output current of the PV is reduced by controlling the boost converter. According to the photovoltaic I–V characteristic curve, the output voltage of the PV increases as a result and moves further away from the maximum power point.

Why is overvoltage a problem in LV grids?

However, overvoltage is the main challenge in many LV grids with PV, and is one of the main limiting factors in increasing PV penetration in LV grids. Overvoltage caused by PV systems happens when the power flow path is reversed from customers to the LV transformers.

What is the maximum voltage increase in LV grids?

As can be seen, to have an acceptable voltage quality at the customer points of connection, the maximum voltage increase in LV grids is limited to 3%, which can potentially limit the maximum PV installation in the grid. Using active MV/LV transformers, a higher voltage increase along the feeder is acceptable.

How to prevent overvoltage in high PV penetration conditions?

To prevent the overvoltage in high PV penetration conditions, EESS can be applied in order to store a part of the energy generated by PVs and limit the amount of active power injected into the grid by PV units.

Can a low PV system cause overvoltage?

In residential feeders, in which the load consumption is relatively small during high PV generation periods, the potential for overvoltage is greater, and a lower share of PV systems may cause reverse power flow and an unacceptable voltage rise in the grid.

Is overvoltage a technical problem in LV networks?

In countries with high penetration of PV in distribution networks, overvoltage is a technical problem of most concern in LV networks with PV systems [ 2 ]. Thus, different voltage control methods including decentralized [ 4] and distributed [ 5] control have been proposed in the specialized literature.