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Fig 1.

Single-phase LCL-type grid-connected inverter.

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Fig 1 Expand

Fig 2.

Bode plot of the transfer function.

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Fig 2 Expand

Fig 3.

Block diagram of first-order active disturbance rejection control.

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Fig 3 Expand

Fig 4.

PI-LADRC control diagram.

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Fig 4 Expand

Fig 5.

Experimental platform.

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Fig 5 Expand

Table 1.

Main hardware parameters of the experimental platform.

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Table 1 Expand

Fig 6.

Comparison of error between the two control methods.

(a) PI-PR. (b) PI-LADRC.

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Fig 6 Expand

Fig 7.

shows the PI-PR grid current and THD analysis before and after the power step change.

(a) PI-PR grid current. (b) THD value of grid current before and after the power step change.

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Fig 7 Expand

Fig 8.

shows the PI-PR grid current and THD analysis before and after the power step change.

(a) PI-LADRC grid current. (b) THD value of grid current before and after the power step change.

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Fig 8 Expand

Table 2.

THD value comparison table.

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Table 2 Expand

Fig 9.

Current step response waveform.

(a) PI-PR. (b) PI-LADRC.

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Fig 9 Expand