add reference to inverter.sandia_multi (#1479)

* add reference

* corrections

Co-authored-by: Kevin Anderson <kevin.anderson@nrel.gov>

docs/sphinx/source/whatsnew/v0.9.2.rst

@@ -30,6 +30,7 @@ Testing
 
 Documentation
 ~~~~~~~~~~~~~
+* Added a reference to :py:func:`pvlib.inverter.sandia_multi`. (:pull:`1479`)
 * Add gallery example of simulating rearside irradiance for a fixed-tilt
   array with pvfactors (:pull:`1470`)
 
@@ -50,3 +51,4 @@ Contributors
 * Chencheng Luo (:ghuser:`roger-lcc`)
 * Prajwal Borkar (:ghuser:`PrajwalBorkar`) 
 * Kevin Anderson (:ghuser:`kanderso-nrel`)
+* Cliff Hansen (:ghuser:`cwhanse`)

pvlib/inverter.py

@@ -142,7 +142,8 @@ def sandia_multi(v_dc, p_dc, inverter):
     Convert DC power and voltage to AC power for an inverter with multiple
     MPPT inputs.
 
-    Uses Sandia's Grid-Connected PV Inverter model [1]_.
+    Uses Sandia's Grid-Connected PV Inverter model [1]_. Extension of [1]_
+    to inverters with multiple, unbalanced inputs as described in [2]_.
 
     Parameters
     ----------
@@ -177,6 +178,9 @@ def sandia_multi(v_dc, p_dc, inverter):
     .. [1] D. King, S. Gonzalez, G. Galbraith, W. Boyson, "Performance Model
        for Grid-Connected Photovoltaic Inverters", SAND2007-5036, Sandia
        National Laboratories.
+    .. [2] C. Hansen, J. Johnson, R. Darbali-Zamora, N. Gurule. "Modeling
+       Efficiency Of Inverters With Multiple Inputs", 49th IEEE Photovoltaic
+       Specialist Conference, Philadelphia, PA, USA. June 2022.
 
     See also
     --------