Stability analysis of digitally controlled LCL-type grid-connected inverter considering the delay effect

What is it about?

For the digitally controlled LCL-type grid-connected inverter system, the computation and PWM delays play an important role in the system performance. This paper has presented a general way to analyse the delay effect on the system stability and damping performance by means of Nyquist diagram in the continuous domain.

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Why is it important?

For the digitally controlled LCL-type grid-connected inverter, the digital control delay has a significant effect on the system stability. However, when the delay is different, the stability constraint condition will be changed.