fix deepcopy problem with controllers

pandapower/auxiliary.py

@@ -35,6 +35,7 @@
 import scipy as sp
 from packaging import version
 import six
+import json
 
 from pandapower.pypower.idx_brch import F_BUS, T_BUS, BR_STATUS
 from pandapower.pypower.idx_bus import BUS_I, BUS_TYPE, NONE, PD, QD, VMIN, VMAX, PV
@@ -164,6 +165,11 @@ def __getattr__(self, key):
 
         return self._build(self[key])
 
+    def __deepcopy__(self, memo):
+        from pandapower.file_io import PPJSONEncoder, from_json_string
+        json_string = json.dumps(self, cls=PPJSONEncoder)
+        return from_json_string(json_string)
+
     @classmethod
     def _valid_name(cls, key):
         """

pandapower/io_utils.py

@@ -463,6 +463,15 @@ def from_json(cls, json_string):
         d = json.loads(json_string, cls=PPJSONDecoder)
         return cls.from_dict(d)
 
+    def __copy__(self):
+        print("hello")
+
+
+    def __deepcopy__(self, memo):
+        super().__deepcopy__(self, memo)
+#        cls = self.__class__
+        print("helloe")
+
 
 def with_signature(obj, val, obj_module=None, obj_class=None):
     if obj_module is None:

pandapower/test/api/test_file_io.py

@@ -13,6 +13,7 @@
 import pandapower.topology as top
 from pandapower.test.toolbox import assert_net_equal, create_test_network, tempdir, net_in
 import pandapower.networks as nw
+import pandapower.control as ct
 from pandapower.io_utils import PPJSONEncoder, PPJSONDecoder
 import json
 import numpy as np
@@ -242,6 +243,12 @@ def test_json_io_same_net(net_in, tempdir):
     net2 = pp.from_json(filename)
     assert net2.controller.object.at[0].net is net2
 
+def test_deepcopy_controller():
+    net = nw.mv_oberrhein()
+    ct.ContinuousTapControl(net, 114, 1.01)  
+    assert net == net.controller.object.iloc[0].net   
+    net2 = copy.copy(net)    
+    assert net2 == net2.controller.object.iloc[0].net
 
 if __name__ == "__main__":
     pytest.main([__file__, "-x"])