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.

What is a photovoltaic grid-connected cabinet?

Photovoltaic grid-connected cabinet is a distribution equipment connecting photovoltaic power station and power grid, and is the total outgoing of photovoltaic power station in the photovoltaic power generation system, and its main role is to act as the dividing point between the photovoltaic power generation system and the power grid.

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.

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.

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.

Does inverter stability under nonlinear and random disturbances ensure stability?

Finally, experimental and simulation results verify that the proposed method ensures inverter stability under nonlinear and random disturbances, significantly suppressing oscillations while maintaining operation without steady-state errors.