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Table 2 Comparisons of tracking errors performance \(e_{1} = v_{dcr} - v_{dc}\) and \(e_{2} = i_{qr} - i_{q}\)

From: A robust model-free controller for a three-phase grid-connected photovoltaic system based on ultra-local model

Control strategy

Average of (abs(\(e_{i}\)))

Range of \(e_{i}\)

Standard deviation of \(e_{i}\)

MFC

   

\(e_{1}\)

1.53

(− 54.59, 4)

4.40

\(e_{2}\)

0.98

(− 2.50, 21.08)

1.38

IOFLC [4]

   

\(e_{1}\)

6.82

(− 34.32, 308.18)

23.446

\(e_{2}\)

8.56

(− 686.33, 170.22)

53.07