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Table 1 Monthly Weibull parameters estimated from four numerical methods at hub height of 65 m

From: Comparison of Weibull parameters computation methods and analytical estimation of wind turbine capacity factor using polynomial power curve model: case study of a wind farm

Months

Graphical method

Empirical method

Modified maximum likelihood method

Energy pattern factor method

 

k

c (m/s)

k

c (m/s)

k

c (m/s)

k

c (m/s)

Apr 2011

1.7438

5.6863

2.1545

6.4137

2.0761

6.3507

2.1681

6.4137

May 2011

2.3472

9.0708

3.3229

9.3500

3.2595

9.2646

3.0793

9.3845

Jun 2011

2.0217

9.7378

2.9515

10.1866

2.9708

10.1471

2.8994

10.1942

Jul 2011

2.0981

7.7550

2.7184

8.2294

2.6535

8.1868

2.6637

8.2351

Aug 2011

1.8876

5.8166

2.6121

6.6079

2.5513

6.5499

2.6569

6.6044

Sep 2011

2.1592

6.3457

3.0948

6.8103

3.0623

6.7587

2.9802

6.8218

Oct 2011

1.5196

4.5302

1.8902

5.2394

1.7922

5.1967

1.9311

5.2428

Nov 2011

1.5284

3.4343

1.9543

4.0376

1.8758

4.0250

2.0225

4.0404

Dec 2011

1.5917

4.4552

2.1348

5.0925

2.0331

5.0567

2.2038

5.0924

Jan 2012

1.6794

4.5200

2.1957

5.1489

2.1198

5.1213

2.2430

5.1484

Feb 2012

1.8906

5.1810

2.3963

5.7532

2.3343

5.7274

2.4081

5.7527

Mar 2012

1.7159

5.6665

2.0785

6.2319

2.0251

6.2152

2.0626

6.2314