Do grid-connected inverters cause high-frequency oscillations?

Grid-connected inverters are crucial interfaces in renewable energy power systems. However, with the continuous increase in the penetration of renewable energy generation, the dynamic interaction between these inverters and the grid becomes increasingly complex, leading to prominent high-frequency oscillation issues.

Can a PWM inverter suppress high-frequency oscillation?

On the basis of traditional dual-loop control, an impedance reconstruction control of the source PWM inverter is proposed, which can effectively suppress the high-frequency oscillation of the island power system. The following conclusions can be drawn from this paper:

How to mitigate high-frequency oscillation?

Among the diverse strategies to mitigate high-frequency oscillation, optimizing control parameters and improving controller structures are two main approaches.

Do filter and delay characteristics cause high-frequency oscillations in grid-connected systems?

This paper addresses the high-frequency oscillations in grid-connected systems caused by filter and delay characteristics, by proposing an enhanced grid-connected current feedback active damping control strategy with phase compensation to effectively mitigate these oscillations.

What is the frequency-domain action range of a grid-connected inverter?

The frequency-domain action range of each component in the grid-connected inverter helps identify and understand how each part affects overall system stability, thereby formulating effective high-frequency oscillation suppression strategies.

What happens after adding impedance reconstruction control in a PWM inverter?

After adding impedance reconstruction control, the output voltages and currents of the source PWM inverter loaded with pure resistive load remain stable under different output power; when the load is a PWM rectifier, the high-frequency oscillation of the island power system is effectively suppressed.