Photovoltaic Inverter Gateway

How to match a solar inverter with a PV plant?

To couple a solar inverter with a PV plant, ensure that certain parameters match between them. After designing the photovoltaic string, calculate the maximum open-circuit voltage (Voc,MAX) on the DC side (according to the IEC standard).

What are the main categories of inverters used in PV applications?

Inverters used in photovoltaic applications are historically divided into two main categories: Standalone inverters are for the applications where the PV plant is not connected to the main energy distribution network.

What are the switching devices in a 3 phase solar inverter?

In Figure 2, a three-phase inverter is represented, and from each “leg” of the bridge are two switching devices, commonly MOSFET or IGBT. Nowadays, 3 IGBT is the most popular solution for solar inverters. Control logic governs the switching behavior of the IGBT in such a way as to produce DC to AC conversion.

What is the I-V curve of a solar PV module?

The I-V curve of a solar PV module is available in each PV module’s datasheet and is calculated according to the Standard Test Condition (STC): (1000 W/m2, 25 °C, IAM 1.5). Figure 3 - Example of I-V curve of a PV module. Image courtesy of PVEducation.

What is a standalone inverter?

A standalone inverter is used in applications where the PV plant is not connected to the main energy distribution network. It supplies electrical energy to connected loads, ensuring the stability of the main electrical parameters (voltage and frequency).

How to check if a PV inverter is working properly?

To check if a PV inverter is working properly, ensure that the maximum short circuit current of the PV field is lower than the maximum current allowed by the inverter. This can be checked using the formula: ISC, MAXPV < IDC, MAXINV