This application note describes the development and evaluation of a conversion system for PV applications with the target of achieving a significant reduction in production costs and high efficiency. It consists of a high frequency isolated input power section performing DC-DC conversion and an inverter section capable of delivering sinusoidal current of 50 Hz to the grid. The system operates with input voltages in the range of 200 V to 400 V and is tied to the grid at 230 Vrms, 50 Hz, through an LCL filter. Other peculiar characteristics of the proposed converter are the integration level, decoupled active and reactive power control and flexibility towards the source.
The document details a 3 kW grid-connected PV system based on the STEVAL-ISV002V1 and STEVAL-ISV002V2 demonstration boards. The system utilizes a dual-stage converter architecture, featuring a high-frequency isolated DC-DC section for voltage adaptation and an inverter section for sinusoidal current injection into the 230 Vrms, 50 Hz grid.
The nominal output power of the system is 3 kW.
The system operates with input voltages in the range of 200 V to 400 V.
The system is tied to the grid at 230 Vrms, 50 Hz.