ENH: Port PVsyst and Desoto parameter estimation from MATLAB

.stickler.yml

@@ -2,7 +2,7 @@ linters:
     flake8:
         python: 3
         max-line-length: 79
-        ignore: E201,E241,E226
+        ignore: E201,E241,E226,W503,W504
 files:
     ignore:
         - 'pvlib/_version.py'

ci/requirements-py35.yml

@@ -23,6 +23,7 @@ dependencies:
     - scipy
     - shapely  # pvfactors dependency
     - siphon  # conda-forge
+    - statsmodels
     - pip:
         - nrel-pysam>=2.0
         - pvfactors==1.4.1

ci/requirements-py36.yml

@@ -25,6 +25,7 @@ dependencies:
     - scipy
     - shapely  # pvfactors dependency
     - siphon  # conda-forge
+    - statsmodels
     - pip:
         - nrel-pysam>=2.0
         - pvfactors==1.4.1

ci/requirements-py37.yml

@@ -25,6 +25,7 @@ dependencies:
     - scipy
     - shapely  # pvfactors dependency
     - siphon  # conda-forge
+    - statsmodels
     - pip:
         - nrel-pysam>=2.0
         - pvfactors==1.4.1

docs/sphinx/source/api.rst

@@ -314,6 +314,7 @@ Pvsyst model
 .. autosummary::
    :toctree: generated/
 
+   pvsystem.calcparams_pvsyst
    temperature.pvsyst_cell
    pvsystem.calcparams_pvsyst
    pvsystem.singlediode
@@ -328,6 +329,35 @@ PVWatts model
    inverter.pvwatts
    pvsystem.pvwatts_losses
 
+Estimating PV model parameters
+------------------------------
+
+Functions for fitting single diode models
+
+.. autosummary::
+   :toctree: generated/
+
+    ivtools.sdm.fit_cec_sam
+    ivtools.sdm.fit_desoto
+    ivtools.sdm.fit_pvsyst_sandia
+    ivtools.sdm.fit_desoto_sandia
+
+Functions for fitting the single diode equation
+
+.. autosummary::
+   :toctree: generated/
+
+    ivtools.sde.fit_sandia_simple
+
+Utilities for working with IV curve data
+
+.. autosummary::
+   :toctree: generated/
+
+    ivtools.utility.numdiff
+    ivtools.utility.rectify_iv_curve
+    ivtools.utility.schumaker_qspline
+
 Other
 -----
 

pvlib/data/ivtools_numdiff.dat

@@ -0,0 +1,52 @@
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+0,20.0528,nan,nan