Merge pull request #2065 from rbolgaryn/fix/gen_at_isolated_bus

gen bug

pandapower/test/loadflow/test_runpp.py

@@ -1472,5 +1472,18 @@ def test_lightsim2grid_option():
     assert net._options["lightsim2grid"]
 
 
+def test_at_isolated_bus():
+    net = pp.create_empty_network()
+    pp.create_buses(net, 4, 110)
+    pp.create_ext_grid(net, 0)
+
+    pp.create_line_from_parameters(net, 0, 1, 30, 0.0487, 0.13823, 160, 0.664)
+
+    pp.create_gen(net, 3, 0, vm_pu=0, in_service=False)
+
+    pp.runpp(net)
+    assert net._options["init_vm_pu"] == 1.
+
+
 if __name__ == "__main__":
     pytest.main([__file__, "-xs"])