Vietnam power frequency off-grid inverter

Off-Grid Inverter. Generally speaking, a solar inverter is a type of electrical converter that converts the variable direct current (DC) output of a solar panel into a utility frequency alternating current (AC) that can be fed into a commercial electrical grid or used by a local, off-grid electrical network.

An off-grid solar system, also known as off-the-grid or standalone, is a photovoltaic system that has no access to the utility grid. For this reason, off-grid solar systems involve both solar panels and battery storage, so the power can be coming to the building from either of these two sources at any given time — depending on the solar situation.

To reflect the fact that this will cause substantial changes to the performance characteristics of the future Vietnamese power system, ERAV has proposed amendments to the Vietnamese Grid Code. These changes are considered necessary to ensure secure system operation of the future Vietnamese power system.

Statistics released in late 2020 reveal that Vietnam's solar capacity stood at over 7.4 Gigawatts. This is positively surprising considering that the country's solar capacity was only 4 megawatts in 2015. The figure below will help paint a clear picture of Vietnam's exponential growth in matters concerning solar energy;

Single phase installations are permitted for PV systems with a rated a.c. capacity of up to 5kVA. Up to 15kVA, PV installations can use single phase inverters with ratings up to 5kVA, which must be connected in a balanced manner over the three phases.

The voltage range defined by the Vietnamese requirements is equal to 0.2. This is lower than in most synchronous areas of the ENTSO-E but larger than the voltage range of the Nordic system. Consequently, the Vietnamese requirements would not fit into the inner envelope according to Figure 4 for any of the five synchronous areas of the ENTSO-E.