Can inverter stability be improved in power stations?

This work provides a feasible solution for enhancing inverter stability in power stations, contributing to the reliable integration of renewable energy. Existing grid-connected inverters encounter stability issues when facing nonlinear changes in the grid, and current solutions struggle to manage complex grid environments effectively.

Are grid-connected inverters stable?

Abstract: Existing grid-connected inverters encounter stability issues when facing nonlinear changes in the grid, and current solutions struggle to manage complex grid environments effectively.

How can a passivity-based control strategy improve grid-forming multi-inverter power stations?

We propose a passivity-based control strategy to enhance the stability and dynamic performance of grid-forming multi-inverter power stations and address these challenges. The inner loop designed from the perspective of energy reshaping, ensures the stability of the inverter’s output.

Does a Lyapunov-based stability criteria ensure a stably operated inverter?

We demonstrate the passivity of the overall controller with Lyapunov-based stability criteria. This ensures that the inverters within a power station can operate stably under nonlinear and random changes in grid structure and parameters.

What is the grid voltage of a flyback converter?

The grid voltage is assumed to be a half-wave, rectified voltage with the same RMS value as the AC grid. This assumption is made for simplifying the analysis of the flyback converter.

What is a grid-connected solar microinverter system?

A high-level block diagram of a grid-connected solar microinverter system is shown in Figure 4. The term, “microinverter”, refers to a solar PV system comprised of a single low-power inverter module for each PV panel.