Is there a dual closed-loop repetitive control strategy for single-phase grid-connected inverters?

In this paper, a novel dual closed-loop repetitive control strategy based on grid current feedback is proposed for single-phase grid-connected inverters with LCL filters. The proportional-integral inner loop is stabilized by using an inherent one-beat delay achieved by digital controller.

How to control an inverter?

trategy of the inverter must guarantee its output waveforms to be sinusoidal with fundamental harmonic. For this purpose, close loop current control strategies such as H∞ repetitive controller, dual closed-loop feedback control, Adaptive Voltage Control, SRFPI controller, Optimal Neural Controlle

Can Dual-loop control improve steady-state performance of single-phase inverter power supply?

Secondly, using the pole configuration method, the parameters of the double closed-loop PI can be obtained. Finally, the model is built by SIMULINK. The simulation results verify that the dual-loop control can improve and improve the steady-state performance and dynamic performance of single-phase inverter power supply.

How can a single-phase inverter improve performance?

By establishing the mathematical model of the single-phase inverter, the current inner loop control can obtain rapid dynamic performance, and the voltage outer loop control can improve the steady-state performance of the system. Secondly, using the pole configuration method, the parameters of the double closed-loop PI can be obtained.

What is a dual loop control method?

The repetitive dual-loop control method is adopted. The outer loop is controlled by the RC, which makes the grid-connected current ig track the sinusoidal reference iref without a steady-state error. The PI control method is applied in the inner loop, which can increase the damping of the system to suppress the resonance peak.

Is dual closed-loop control method better than other control methods?

Shown in Fig. 25 (d), harmonic content is very low and the output is 15.009A when using the dual closed-loop control method proposed in this paper. The steady-state error is 0.18%. It is clear that the proposed control method has better steady performance than the other methods, and the THD is only 0.9%.