Self-synchronized Synchronverter with Enhanced Dynamics and Current Limitation Capability

What is it about?

Abstract: Inertia-less power converters::: are one of the main obstructions to increase the penetration level of distributed energy resources (DER) in the utility grid. Stability of the power system mainly depends on the system inertia. Virtual Synchronous Machine (VSM) and Synchronverter based grid-tied inverters have been introduced as a solution to this problem. In this paper, a modified self-synchronized synchronverter is introduced to enhance the dynamic response of the active power loop and to limit the injected active/reactive power to the grid. Furthermore, the injected current to the grid is limited during faults employing proportional-resonant (PR) based inner current loop. Feedforward voltage is implemented in the current control loop to achieve seamless transfer between standalone and grid-connection modes of operation. Extensive simulation and experimental results are obtained to verify the proposed enhanced controller.

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Photo by Andreas Gücklhorn on Unsplash

Photo by Andreas Gücklhorn on Unsplash

Why is it important?

This idea of the this research work is important to increase the inertia provided by the different types of renewable energy systems utilizing virtual inertia. This inertia greatly enhances the overall system stability.