refactor cec test data into fixtures (#774)

Refactors module and inverter parameter sets used for tests into conftest.py. Parameter sets are hardcoded rather than read from the current version of the SAM data files, since the values in the SAM files may not be stable.

Thanks @Peque

Author: Peque

pvlib/test/conftest.py

@@ -149,3 +149,203 @@ def has_numba():
 
 requires_pvfactors = pytest.mark.skipif(not has_pvfactors,
                                         reason='requires pvfactors')
+
+
+@pytest.fixture(scope="session")
+def sam_data():
+    data = {}
+    data['sandiamod'] = pvlib.pvsystem.retrieve_sam('sandiamod')
+    data['adrinverter'] = pvlib.pvsystem.retrieve_sam('adrinverter')
+    return data
+
+
+@pytest.fixture(scope="function")
+def pvsyst_module_params():
+    """
+    Define some PVSyst module parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'gamma_ref': 1.05,
+        'mu_gamma': 0.001,
+        'I_L_ref': 6.0,
+        'I_o_ref': 5e-9,
+        'EgRef': 1.121,
+        'R_sh_ref': 300,
+        'R_sh_0': 1000,
+        'R_s': 0.5,
+        'R_sh_exp': 5.5,
+        'cells_in_series': 60,
+        'alpha_sc': 0.001,
+    }
+    return parameters
+
+
+@pytest.fixture(scope='function')
+def cec_inverter_parameters():
+    """
+    Define some CEC inverter parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'Name': 'ABB: MICRO-0.25-I-OUTD-US-208 208V [CEC 2014]',
+        'Vac': 208.0,
+        'Paco': 250.0,
+        'Pdco': 259.5220505,
+        'Vdco': 40.24260317,
+        'Pso': 1.771614224,
+        'C0': -2.48e-5,
+        'C1': -9.01e-5,
+        'C2': 6.69e-4,
+        'C3': -0.0189,
+        'Pnt': 0.02,
+        'Vdcmax': 65.0,
+        'Idcmax': 10.0,
+        'Mppt_low': 20.0,
+        'Mppt_high': 50.0,
+    }
+    return parameters
+
+
+@pytest.fixture(scope='function')
+def cec_module_params():
+    """
+    Define some CEC module parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'Name': 'Example Module',
+        'BIPV': 'Y',
+        'Date': '4/28/2008',
+        'T_NOCT': 65,
+        'A_c': 0.67,
+        'N_s': 18,
+        'I_sc_ref': 7.5,
+        'V_oc_ref': 10.4,
+        'I_mp_ref': 6.6,
+        'V_mp_ref': 8.4,
+        'alpha_sc': 0.003,
+        'beta_oc': -0.04,
+        'a_ref': 0.473,
+        'I_L_ref': 7.545,
+        'I_o_ref': 1.94e-09,
+        'R_s': 0.094,
+        'R_sh_ref': 15.72,
+        'Adjust': 10.6,
+        'gamma_r': -0.5,
+        'Version': 'MM105',
+        'PTC': 48.9,
+        'Technology': 'Multi-c-Si',
+    }
+    return parameters
+
+
+@pytest.fixture(scope='function')
+def cec_module_cs5p_220m():
+    """
+    Define Canadian Solar CS5P-220M module parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'Name': 'Canadian Solar CS5P-220M',
+        'BIPV': 'N',
+        'Date': '10/5/2009',
+        'T_NOCT': 42.4,
+        'A_c': 1.7,
+        'N_s': 96,
+        'I_sc_ref': 5.1,
+        'V_oc_ref': 59.4,
+        'I_mp_ref': 4.69,
+        'V_mp_ref': 46.9,
+        'alpha_sc': 0.004539,
+        'beta_oc': -0.22216,
+        'a_ref': 2.6373,
+        'I_L_ref': 5.114,
+        'I_o_ref': 8.196e-10,
+        'R_s': 1.065,
+        'R_sh_ref': 381.68,
+        'Adjust': 8.7,
+        'gamma_r': -0.476,
+        'Version': 'MM106',
+        'PTC': 200.1,
+        'Technology': 'Mono-c-Si',
+    }
+    return parameters
+
+
+@pytest.fixture(scope='function')
+def cec_module_spr_e20_327():
+    """
+    Define SunPower SPR-E20-327 module parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'Name': 'SunPower SPR-E20-327',
+        'BIPV': 'N',
+        'Date': '1/14/2013',
+        'T_NOCT': 46,
+        'A_c': 1.631,
+        'N_s': 96,
+        'I_sc_ref': 6.46,
+        'V_oc_ref': 65.1,
+        'I_mp_ref': 5.98,
+        'V_mp_ref': 54.7,
+        'alpha_sc': 0.004522,
+        'beta_oc': -0.23176,
+        'a_ref': 2.6868,
+        'I_L_ref': 6.468,
+        'I_o_ref': 1.88e-10,
+        'R_s': 0.37,
+        'R_sh_ref': 298.13,
+        'Adjust': -0.1862,
+        'gamma_r': -0.386,
+        'Version': 'NRELv1',
+        'PTC': 301.4,
+        'Technology': 'Mono-c-Si',
+    }
+    return parameters
+
+
+@pytest.fixture(scope='function')
+def cec_module_fs_495():
+    """
+    Define First Solar FS-495 module parameters for testing.
+
+    The scope of the fixture is set to ``'function'`` to allow tests to modify
+    parameters if required without affecting other tests.
+    """
+    parameters = {
+        'Name': 'First Solar FS-495',
+        'BIPV': 'N',
+        'Date': '9/18/2014',
+        'T_NOCT': 44.6,
+        'A_c': 0.72,
+        'N_s': 216,
+        'I_sc_ref': 1.55,
+        'V_oc_ref': 86.5,
+        'I_mp_ref': 1.4,
+        'V_mp_ref': 67.9,
+        'alpha_sc': 0.000924,
+        'beta_oc': -0.22741,
+        'a_ref': 2.9482,
+        'I_L_ref': 1.563,
+        'I_o_ref': 2.64e-13,
+        'R_s': 6.804,
+        'R_sh_ref': 806.27,
+        'Adjust': -10.65,
+        'gamma_r': -0.264,
+        'Version': 'NRELv1',
+        'PTC': 89.7,
+        'Technology': 'CdTe',
+    }
+    return parameters