Grid-connected Soft Switching Partial Resonance Inverter for Distributed Generation

TL;DR

This paper introduces a grid-connected partial resonant soft switching inverter with a novel current control method that eliminates electrolytic capacitors, enhances voltage regulation, and mitigates filter resonance, demonstrated on a 400W prototype.

Contribution

It proposes a new current control approach for a capacitor-free, soft switching inverter with active damping, improving grid integration of distributed energy sources.

Findings

Successful implementation on a 400W prototype.

Effective resonance mitigation using active damping.

Capacitor-free inverter with voltage boosting and bucking capabilities.

Abstract

This paper presents current control method for a grid-connected partial resonant soft switching inverter. This inverter does not use an electrolytic capacitor and is capable of boosting and bucking the voltage. Grid-connected inverters are used to integrate distributed energy sources to the grid. Current control is vital in meeting the standards and requirements when connecting to the grid. The closed-loop current regulation for this type of converters is analyzed and design guidelines are provided. The control is implemented in the synchronous frame. In addition active damping techniques using capacitor voltage and inductor voltage feedback is used to mitigate CL filter resonance at the output. The mentioned control strategies are implemented on a 400W lab prototype and the results are presented