From 652787c0c405cdb1d0bd45202bb838aa5a786d73 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrik=20Sch=C3=B6nfeldt?= <patrik.schoenfeldt@dlr.de>
Date: Thu, 13 Dec 2018 08:25:36 +0100
Subject: [PATCH 1/3] Add example for activity_costs

---
 .../activity_costs/activity_costs.py          | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)
 create mode 100644 examples/oemof_0.3/activity_costs/activity_costs.py

diff --git a/examples/oemof_0.3/activity_costs/activity_costs.py b/examples/oemof_0.3/activity_costs/activity_costs.py
new file mode 100644
index 0000000..b96e3b3
--- /dev/null
+++ b/examples/oemof_0.3/activity_costs/activity_costs.py
@@ -0,0 +1,93 @@
+# -*- coding: utf-8 -*-
+
+"""
+General description
+-------------------
+This example illustrates the effect of activity_costs.
+
+There are the following components:
+
+    - demand_heat: heat demand (constant, for the sake of simplicity)
+    - fireplace: wood firing, burns "for free" if somebody is around
+    - boiler: gas firing, consumes (paid) gas
+
+
+Installation requirements
+-------------------------
+This example requires version 0.3 of oemof. Install by:
+
+    pip install 'oemof>=0.3'
+
+"""
+
+import numpy as np
+import pandas as pd
+import pprint as pp
+import oemof.solph as solph
+from oemof.outputlib import processing, views
+from oemof.tools import economics
+
+try:
+    import matplotlib.pyplot as plt
+except ImportError:
+    plt = None
+
+##########################################################################
+# Calculate parameters and initialize the energy system and
+##########################################################################
+
+periods = 24
+time = pd.date_range('1/1/2018', periods=periods, freq='D')
+
+at_home = np.zeros(periods)
+at_home[10:16] = 1
+
+demand_heat = np.zeros(periods)
+demand_heat[6:22] = 5
+
+es = solph.EnergySystem(timeindex=time)
+
+b_heat = solph.Bus(label='b_heat')
+
+es.add(b_heat)
+
+sink_heat = solph.Sink(
+    label='demand',
+    inputs={b_heat: solph.Flow(
+        fixed=True,
+        actual_value=demand_heat,
+        nominal_value=1)})
+
+fireplace = solph.Source(
+    label='fireplace',
+    outputs={b_heat: solph.Flow(nominal_value=10, activity_costs=1.0-at_home)})
+
+boiler = solph.Source(
+    label='boiler',
+    outputs={b_heat: solph.Flow(nominal_value=10, variable_costs=0.2)})
+
+es.add(sink_heat, fireplace, boiler)
+
+##########################################################################
+# Optimise the energy system
+##########################################################################
+
+# create an optimization problem and solve it
+om = solph.Model(es)
+
+# solve model
+om.solve(solver='cbc', solve_kwargs={'tee': True})
+
+##########################################################################
+# Check and plot the results
+##########################################################################
+
+results = processing.results(om)
+
+# plot data
+if plt is not None:
+    data = views.node(results, 'b_heat')['sequences']
+    ax = data.plot(kind='line', drawstyle='steps-post', grid=True, rot=0)
+    ax.set_xlabel('Time')
+    ax.set_ylabel('Heat (arb. units)')
+    plt.show()

From 6938c4707edc153c2f00c8a254e7c8dbf2c50c2a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrik=20Sch=C3=B6nfeldt?= <patrik.schoenfeldt@dlr.de>
Date: Thu, 13 Dec 2018 10:37:38 +0100
Subject: [PATCH 2/3] Fully implement example for activity_costs

---
 .../activity_costs/activity_costs.py          | 24 +++++++++++++------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/examples/oemof_0.3/activity_costs/activity_costs.py b/examples/oemof_0.3/activity_costs/activity_costs.py
index b96e3b3..7a22508 100644
--- a/examples/oemof_0.3/activity_costs/activity_costs.py
+++ b/examples/oemof_0.3/activity_costs/activity_costs.py
@@ -11,6 +11,10 @@
     - fireplace: wood firing, burns "for free" if somebody is around
     - boiler: gas firing, consumes (paid) gas
 
+Notice that activity_costs is an attribute to NonConvex.
+This is because it relies on the activity status of a component
+which is only available for nonconvex flows.
+
 
 Installation requirements
 -------------------------
@@ -37,13 +41,14 @@
 ##########################################################################
 
 periods = 24
-time = pd.date_range('1/1/2018', periods=periods, freq='D')
+time = pd.date_range('1/1/2018', periods=periods, freq='H')
 
-at_home = np.zeros(periods)
-at_home[10:16] = 1
+demand_heat = np.full(periods,5)
+demand_heat[:4] = 0
+demand_heat[4:18] = 4
 
-demand_heat = np.zeros(periods)
-demand_heat[6:22] = 5
+activity_costs = np.full(periods,5)
+activity_costs[18:] = 0
 
 es = solph.EnergySystem(timeindex=time)
 
@@ -60,11 +65,15 @@
 
 fireplace = solph.Source(
     label='fireplace',
-    outputs={b_heat: solph.Flow(nominal_value=10, activity_costs=1.0-at_home)})
+    outputs={b_heat: solph.Flow(nominal_value=3,
+                                variable_costs=0,
+                                nonconvex=solph.NonConvex(
+                                    activity_costs=activity_costs))})
 
 boiler = solph.Source(
     label='boiler',
-    outputs={b_heat: solph.Flow(nominal_value=10, variable_costs=0.2)})
+    outputs={b_heat: solph.Flow(nominal_value=10,
+                                variable_costs=1)})
 
 es.add(sink_heat, fireplace, boiler)
 
@@ -91,3 +100,4 @@
     ax.set_xlabel('Time')
     ax.set_ylabel('Heat (arb. units)')
     plt.show()
+

From 96c40d75ff65864fd69ac9f61eebb90b6e0fd696 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Patrik=20Sch=C3=B6nfeldt?= <patrik.schoenfeldt@dlr.de>
Date: Thu, 13 Dec 2018 09:42:25 +0100
Subject: [PATCH 3/3] Adhere to PEP8

---
 examples/oemof_0.3/activity_costs/activity_costs.py | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/examples/oemof_0.3/activity_costs/activity_costs.py b/examples/oemof_0.3/activity_costs/activity_costs.py
index 7a22508..e84c2d2 100644
--- a/examples/oemof_0.3/activity_costs/activity_costs.py
+++ b/examples/oemof_0.3/activity_costs/activity_costs.py
@@ -26,10 +26,8 @@
 
 import numpy as np
 import pandas as pd
-import pprint as pp
 import oemof.solph as solph
 from oemof.outputlib import processing, views
-from oemof.tools import economics
 
 try:
     import matplotlib.pyplot as plt
@@ -43,11 +41,11 @@
 periods = 24
 time = pd.date_range('1/1/2018', periods=periods, freq='H')
 
-demand_heat = np.full(periods,5)
+demand_heat = np.full(periods, 5)
 demand_heat[:4] = 0
 demand_heat[4:18] = 4
 
-activity_costs = np.full(periods,5)
+activity_costs = np.full(periods, 5)
 activity_costs[18:] = 0
 
 es = solph.EnergySystem(timeindex=time)
@@ -100,4 +98,3 @@
     ax.set_xlabel('Time')
     ax.set_ylabel('Heat (arb. units)')
     plt.show()
-