extend transformer logic

Author: amzhao16

pygridsim/defaults.py

@@ -64,6 +64,7 @@
 XHL = 2
 PRIMARY_CONN = Connection.delta
 SECONDARY_CONN = Connection.wye
+KVA_MULTIPLIER = 1.5
 
 """
 Valid parameter lists
@@ -72,6 +73,6 @@
 
 VALID_LOAD_PARAMS = ["kV", "kW", "kvar", "phases"]
 VALID_SOURCE_PARAMS = ["kV", "phases", "frequency"] + IMPEDANCE_PARAMS
-VALID_LINE_TRANSFORMER_PARAMS = ["length", "XHL", "Conns"]
+VALID_LINE_TRANSFORMER_PARAMS = ["length", "XHL", "Conns", "kVA"]
 VALID_PV_PARAMS = ["kV", "phases"]
 VALID_GENERATOR_PARAMS = ["kV", "kW", "phases"]

pygridsim/lines.py

@@ -16,8 +16,7 @@ def _get_kv(node_name):
         return altdss.Generator[node_name].kV
     else:
         raise KeyError("Invalid src or dst name")
-
-
+    
 def _make_line(src, dst, line_type, count, params={}, transformer=True):
     _check_valid_params(params, defaults.VALID_LINE_TRANSFORMER_PARAMS)
     line_type_obj = _get_enum_obj(LineType, line_type)
@@ -43,5 +42,5 @@ def _make_line(src, dst, line_type, count, params={}, transformer=True):
     transformer.Buses = [src, dst]
     transformer.Conns = [defaults.PRIMARY_CONN, defaults.SECONDARY_CONN]
     transformer.kVs = [_get_kv(src), _get_kv(dst)]
-
+    transformer.kVAs = [_get_param(params, "kVA", min(_get_kv(src), _get_kv(dst))*defaults.KVA_MULTIPLIER)]*2
     transformer.end_edit()

sim.json

@@ -1,10 +1,10 @@
 {
     "Voltages": {
-        "source": 1912.250959225854,
-        "load0": 164.87512862167387
+        "source": 9999.995255845008,
+        "load0": 9980.408204684127
     },
     "Losses": {
-        "Active Power Loss": 181552.68984510849,
-        "Reactive Power Loss": 377394.0863595363
+        "Active Power Loss": 72199.46153311006,
+        "Reactive Power Loss": 358848.79247009417
     }
 }

tests/test_circuit.py

@@ -276,6 +276,16 @@ def test_106_transformer_parameters(self):
         circuit.clear()
 
 
+    def test_107_transformer_kva_customization(self):
+        circuit = PyGridSim()
+        circuit.add_load_nodes(params={"kV": 0.12, "kW": 1, "kvar": 1})
+        circuit.update_source(params={"kV": 0.5})
+        circuit.add_lines([("source", "load0")], params={"length": 1, "kVA": 0.001})
+        circuit.solve()
+        print(circuit.results(["Voltages", "Losses"]))
+        circuit.clear()
+
+
 class TestTypeQueryFunctions(unittest.TestCase):
 
     def setUp(self):
@@ -295,4 +305,4 @@ def test_200_type_queries(self):
     def test_200_invalid_type_quer(self):
         circuit = PyGridSim()
         with self.assertRaises(KeyError):
-            circuit.get_types("bad_component_name")
+            circuit.get_types("bad_component_name")