Clipping sphinx documentation

docs/examples/clipping.py

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+"""
+Clipping Detection
+===================
+
+Identifying clipping periods using the PVAnalytics clipping module.
+"""
+
+# %%
+# Identifying and removing clipping periods from AC power time series
+# data aids in generating more accurate degradation analysis results,
+# as using clipped data can lead to under-predicting degradation. In this
+# example, we show how to use
+# :py:func:`pvanalytics.features.clipping.geometric`
+# to mask clipping periods in an AC power time series. We use a
+# normalized time series example provided by the PV Fleets Initiative,
+# where clipping periods are labeled as True, and non-clipping periods are
+# labeled as False. This example is adapted from the DuraMAT DataHub
+# clipping data set:
+# https://datahub.duramat.org/dataset/inverter-clipping-ml-training-set-real-data
+
+import pvanalytics
+from pvanalytics.features.clipping import geometric
+import matplotlib.pyplot as plt
+import pandas as pd
+import pathlib
+import numpy as np
+
+# %%
+# First, read in the ac_power_inv_7539 example, and visualize a subset of the
+# clipping periods via the "label" mask column.
+
+pvanalytics_dir = pathlib.Path(pvanalytics.__file__).parent
+ac_power_file_1 = pvanalytics_dir / 'data' / 'ac_power_inv_7539.csv'
+data = pd.read_csv(ac_power_file_1, index_col=0, parse_dates=True)
+data['label'] = data['label'].astype(bool)
+# This is the known frequency of the time series. You may need to infer
+# the frequency or set the frequency with your AC power time series.
+freq = "15T"
+
+data['value_normalized'].plot()
+data.loc[data['label'], 'value_normalized'].plot(ls='', marker='o')
+plt.legend(labels=[False, True],
+           title="Clipped")
+plt.xticks(rotation=20)
+plt.xlabel("Date")
+plt.ylabel("Normalized AC Power")
+plt.tight_layout()
+plt.show()
+
+# %%
+# Now, use :py:func:`pvanalytics.features.clipping.geometric` to identify
+# clipping periods in the time series. Re-plot the data subset with this mask.
+predicted_clipping_mask = geometric(ac_power=data['value_normalized'],
+                                    freq=freq)
+data['value_normalized'].plot()
+data.loc[predicted_clipping_mask, 'value_normalized'].plot(ls='', marker='o')
+plt.legend(labels=[False, True],
+           title="Clipped")
+plt.xticks(rotation=20)
+plt.xlabel("Date")
+plt.ylabel("Normalized AC Power")
+plt.tight_layout()
+plt.show()
+
+
+# %%
+# Compare the filter results to the ground-truth labeled data side-by-side,
+# and generate an accuracy metric.
+acc = 100 * np.sum(np.equal(data.label,
+                            predicted_clipping_mask))/len(data.label)
+print("Overall model prediction accuracy: " + str(round(acc, 2)) + "%")

docs/whatsnew/0.1.2.rst

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+.. _whatsnew_012:
+
+0.1.2 (TBD)
+-------------------------
+
+Enhancements
+~~~~~~~~~~~~
+
+
+Bug Fixes
+~~~~~~~~~
+
+
+Requirements
+~~~~~~~~~~~~
+
+
+Documentation
+~~~~~~~~~~~~~
+
+* Added an example for
+  :py:func:`pvanalytics.features.clipping.geometric`  (:issue:`133`, :pull:`134`)
+
+Contributors
+~~~~~~~~~~~~
+
+* Kirsten Perry (:ghuser:`kperrynrel`)