diff --git a/.zenodo.json b/.zenodo.json
index d168048..9a78a92 100644
--- a/.zenodo.json
+++ b/.zenodo.json
@@ -1,7 +1,7 @@
 {
   "description": "IEEH Power System Data Model provides a schema to describe the elements of an electrical power system. It provides a hierarchical structure/schema to describe unique entity relations as well as parameter sets.",
   "title": "Power System Data Model - A data model for the description of electrical power systems",
-  "version": "1.5.0",
+  "version": "1.5.1",
   "upload_type": "software",
   "keywords": [
     "Power System Modeling",
@@ -9,7 +9,7 @@
     "Python",
     "Data Model"
   ],
-  "publication_date": "2023-07-06",
+  "publication_date": "2023-07-25",
   "creators": [
     {
       "name": "Institute of Electrical Power Systems and High Voltage Engineering - TU Dresden"
@@ -21,7 +21,7 @@
   "related_identifiers": [
     {
       "scheme": "url",
-      "identifier": "https://github.com/ieeh-tu-dresden/power-system-data-model/tree/1.5.0",
+      "identifier": "https://github.com/ieeh-tu-dresden/power-system-data-model/tree/1.5.1",
       "relation": "isSupplementTo"
     }
   ]
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6d95558..18bfe12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 1.5.1 (2023-07-25)
+
+### Fix
+
+- missing control type information in controller
+
 ## 1.5.0 (2023-07-06)
 
 ### Feat
diff --git a/CITATION.cff b/CITATION.cff
index f1d3f0b..49bde6b 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -1,4 +1,4 @@
-cff-version: 1.5.0
+cff-version: 1.5.1
 message: "If you use this software, please cite it as below."
 authors:
   - family-names: "Institute of Electrical Power Systems and High Voltage Engineering - TU Dresden"
diff --git a/psdm/meta.py b/psdm/meta.py
index 3a5d1cc..3736edd 100644
--- a/psdm/meta.py
+++ b/psdm/meta.py
@@ -12,7 +12,7 @@
 
 from psdm.base import Base
 
-VERSION = "1.5.0"
+VERSION = "1.5.1"
 
 
 class Meta(Base):
diff --git a/pyproject.toml b/pyproject.toml
index 5d1fbe8..c58038b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,7 @@
   name = "ieeh-power-system-data-model"
   readme = "README.md"
   requires-python = ">=3.10"
-  version = "1.5.0"
+  version = "1.5.1"
 
   [project.urls]
     Source = "https://github.com/ieeh-tu-dresden/power-system-data-model"
@@ -86,7 +86,7 @@
 [tool.commitizen]
   name = "cz_conventional_commits"
   tag_format = "$version"
-  version = "1.5.0"
+  version = "1.5.1"
   version_files = [
     ".zenodo.json:version",
     "CITATION.cff:cff-version",
diff --git a/schema/1.5.1/steady_state_case.json b/schema/1.5.1/steady_state_case.json
new file mode 100644
index 0000000..958eb9f
--- /dev/null
+++ b/schema/1.5.1/steady_state_case.json
@@ -0,0 +1,645 @@
+{
+  "$defs": {
+    "ActivePower": {
+      "properties": {
+        "value": {
+          "title": "Value",
+          "type": "number"
+        },
+        "value_a": {
+          "title": "Value A",
+          "type": "number"
+        },
+        "value_b": {
+          "title": "Value B",
+          "type": "number"
+        },
+        "value_c": {
+          "title": "Value C",
+          "type": "number"
+        },
+        "is_symmetrical": {
+          "title": "Is Symmetrical",
+          "type": "boolean"
+        }
+      },
+      "required": [
+        "value",
+        "value_a",
+        "value_b",
+        "value_c",
+        "is_symmetrical"
+      ],
+      "title": "ActivePower",
+      "type": "object"
+    },
+    "ControlCosphiConst": {
+      "properties": {
+        "cosphi_dir": {
+          "$ref": "#/$defs/CosphiDir"
+        },
+        "cosphi": {
+          "maximum": 1,
+          "minimum": 0,
+          "title": "Cosphi",
+          "type": "number"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "COSPHI_CONST"
+        }
+      },
+      "required": [
+        "cosphi_dir",
+        "cosphi"
+      ],
+      "title": "ControlCosphiConst",
+      "type": "object"
+    },
+    "ControlCosphiP": {
+      "properties": {
+        "cosphi_ue": {
+          "maximum": 1,
+          "minimum": 0,
+          "title": "Cosphi Ue",
+          "type": "number"
+        },
+        "cosphi_oe": {
+          "maximum": 1,
+          "minimum": 0,
+          "title": "Cosphi Oe",
+          "type": "number"
+        },
+        "p_threshold_ue": {
+          "maximum": 0,
+          "title": "P Threshold Ue",
+          "type": "number"
+        },
+        "p_threshold_oe": {
+          "maximum": 0,
+          "title": "P Threshold Oe",
+          "type": "number"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "COSPHI_P"
+        }
+      },
+      "required": [
+        "cosphi_ue",
+        "cosphi_oe",
+        "p_threshold_ue",
+        "p_threshold_oe"
+      ],
+      "title": "ControlCosphiP",
+      "type": "object"
+    },
+    "ControlCosphiU": {
+      "properties": {
+        "cosphi_ue": {
+          "maximum": 1,
+          "minimum": 0,
+          "title": "Cosphi Ue",
+          "type": "number"
+        },
+        "cosphi_oe": {
+          "maximum": 1,
+          "minimum": 0,
+          "title": "Cosphi Oe",
+          "type": "number"
+        },
+        "u_threshold_ue": {
+          "minimum": 0,
+          "title": "U Threshold Ue",
+          "type": "number"
+        },
+        "u_threshold_oe": {
+          "minimum": 0,
+          "title": "U Threshold Oe",
+          "type": "number"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "COSPHI_U"
+        }
+      },
+      "required": [
+        "cosphi_ue",
+        "cosphi_oe",
+        "u_threshold_ue",
+        "u_threshold_oe"
+      ],
+      "title": "ControlCosphiU",
+      "type": "object"
+    },
+    "ControlQConst": {
+      "properties": {
+        "q_set": {
+          "title": "Q Set",
+          "type": "number"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "Q_CONST"
+        }
+      },
+      "required": [
+        "q_set"
+      ],
+      "title": "ControlQConst",
+      "type": "object"
+    },
+    "ControlQP": {
+      "properties": {
+        "q_p_characteristic_name": {
+          "title": "Q P Characteristic Name",
+          "type": "string"
+        },
+        "q_max_ue": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Q Max Ue"
+        },
+        "q_max_oe": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Q Max Oe"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "Q_P"
+        }
+      },
+      "required": [
+        "q_p_characteristic_name"
+      ],
+      "title": "ControlQP",
+      "type": "object"
+    },
+    "ControlQU": {
+      "properties": {
+        "m_tg_2015": {
+          "minimum": 0,
+          "title": "M Tg 2015",
+          "type": "number"
+        },
+        "m_tg_2018": {
+          "minimum": 0,
+          "title": "M Tg 2018",
+          "type": "number"
+        },
+        "u_q0": {
+          "minimum": 0,
+          "title": "U Q0",
+          "type": "number"
+        },
+        "u_deadband_up": {
+          "minimum": 0,
+          "title": "U Deadband Up",
+          "type": "number"
+        },
+        "u_deadband_low": {
+          "minimum": 0,
+          "title": "U Deadband Low",
+          "type": "number"
+        },
+        "q_max_ue": {
+          "minimum": 0,
+          "title": "Q Max Ue",
+          "type": "number"
+        },
+        "q_max_oe": {
+          "minimum": 0,
+          "title": "Q Max Oe",
+          "type": "number"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "Q_U"
+        }
+      },
+      "required": [
+        "m_tg_2015",
+        "m_tg_2018",
+        "u_q0",
+        "u_deadband_up",
+        "u_deadband_low",
+        "q_max_ue",
+        "q_max_oe"
+      ],
+      "title": "ControlQU",
+      "type": "object"
+    },
+    "ControlStrategy": {
+      "enum": [
+        "U_CONST",
+        "COSPHI_CONST",
+        "Q_CONST",
+        "Q_U",
+        "Q_P",
+        "COSPHI_P",
+        "COSPHI_U",
+        "TANPHI_CONST",
+        "ND"
+      ],
+      "title": "ControlStrategy",
+      "type": "string"
+    },
+    "ControlTanphiConst": {
+      "properties": {
+        "cosphi_dir": {
+          "$ref": "#/$defs/CosphiDir"
+        },
+        "cosphi": {
+          "maximum": 1,
+          "minimum": 0,
+          "title": "Cosphi",
+          "type": "number"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "TANPHI_CONST"
+        }
+      },
+      "required": [
+        "cosphi_dir",
+        "cosphi"
+      ],
+      "title": "ControlTanphiConst",
+      "type": "object"
+    },
+    "ControlUConst": {
+      "properties": {
+        "u_set": {
+          "minimum": 0,
+          "title": "U Set",
+          "type": "number"
+        },
+        "u_meas_ref": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlledVoltageRef"
+            }
+          ],
+          "default": "POS_SEQ"
+        },
+        "control_strategy": {
+          "allOf": [
+            {
+              "$ref": "#/$defs/ControlStrategy"
+            }
+          ],
+          "default": "U_CONST"
+        }
+      },
+      "required": [
+        "u_set"
+      ],
+      "title": "ControlUConst",
+      "type": "object"
+    },
+    "ControlledVoltageRef": {
+      "enum": [
+        "POS_SEQ",
+        "AVG",
+        "A",
+        "B",
+        "C",
+        "AB",
+        "BC",
+        "CA"
+      ],
+      "title": "ControlledVoltageRef",
+      "type": "string"
+    },
+    "Controller": {
+      "properties": {
+        "node_target": {
+          "title": "Node Target",
+          "type": "string"
+        },
+        "control_type": {
+          "anyOf": [
+            {
+              "$ref": "#/$defs/ControlQConst"
+            },
+            {
+              "$ref": "#/$defs/ControlUConst"
+            },
+            {
+              "$ref": "#/$defs/ControlTanphiConst"
+            },
+            {
+              "$ref": "#/$defs/ControlCosphiConst"
+            },
+            {
+              "$ref": "#/$defs/ControlCosphiP"
+            },
+            {
+              "$ref": "#/$defs/ControlCosphiU"
+            },
+            {
+              "$ref": "#/$defs/ControlQU"
+            },
+            {
+              "$ref": "#/$defs/ControlQP"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Control Type"
+        },
+        "external_controller_name": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "External Controller Name"
+        }
+      },
+      "required": [
+        "node_target"
+      ],
+      "title": "Controller",
+      "type": "object"
+    },
+    "CosphiDir": {
+      "enum": [
+        "UE",
+        "OE"
+      ],
+      "title": "CosphiDir",
+      "type": "string"
+    },
+    "ExternalGrid": {
+      "properties": {
+        "name": {
+          "title": "Name",
+          "type": "string"
+        },
+        "u_0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "U 0"
+        },
+        "phi_0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Phi 0"
+        },
+        "p_0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "P 0"
+        },
+        "q_0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Q 0"
+        }
+      },
+      "required": [
+        "name"
+      ],
+      "title": "ExternalGrid",
+      "type": "object"
+    },
+    "Load": {
+      "properties": {
+        "name": {
+          "title": "Name",
+          "type": "string"
+        },
+        "active_power": {
+          "$ref": "#/$defs/ActivePower"
+        },
+        "reactive_power": {
+          "$ref": "#/$defs/ReactivePower"
+        }
+      },
+      "required": [
+        "name",
+        "active_power",
+        "reactive_power"
+      ],
+      "title": "Load",
+      "type": "object"
+    },
+    "Meta": {
+      "properties": {
+        "name": {
+          "title": "Name",
+          "type": "string"
+        },
+        "date": {
+          "format": "date",
+          "title": "Date",
+          "type": "string"
+        },
+        "id": {
+          "format": "uuid",
+          "title": "Id",
+          "type": "string"
+        },
+        "project": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Project"
+        }
+      },
+      "required": [
+        "name",
+        "date"
+      ],
+      "title": "Meta",
+      "type": "object"
+    },
+    "ReactivePower": {
+      "properties": {
+        "value": {
+          "title": "Value",
+          "type": "number"
+        },
+        "value_a": {
+          "title": "Value A",
+          "type": "number"
+        },
+        "value_b": {
+          "title": "Value B",
+          "type": "number"
+        },
+        "value_c": {
+          "title": "Value C",
+          "type": "number"
+        },
+        "is_symmetrical": {
+          "title": "Is Symmetrical",
+          "type": "boolean"
+        },
+        "controller": {
+          "anyOf": [
+            {
+              "$ref": "#/$defs/Controller"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "required": [
+        "value",
+        "value_a",
+        "value_b",
+        "value_c",
+        "is_symmetrical"
+      ],
+      "title": "ReactivePower",
+      "type": "object"
+    },
+    "Transformer": {
+      "properties": {
+        "name": {
+          "title": "Name",
+          "type": "string"
+        },
+        "tap_pos": {
+          "anyOf": [
+            {
+              "type": "integer"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Tap Pos"
+        }
+      },
+      "required": [
+        "name"
+      ],
+      "title": "Transformer",
+      "type": "object"
+    }
+  },
+  "properties": {
+    "meta": {
+      "$ref": "#/$defs/Meta"
+    },
+    "loads": {
+      "items": {
+        "$ref": "#/$defs/Load"
+      },
+      "title": "Loads",
+      "type": "array"
+    },
+    "transformers": {
+      "items": {
+        "$ref": "#/$defs/Transformer"
+      },
+      "title": "Transformers",
+      "type": "array"
+    },
+    "external_grids": {
+      "items": {
+        "$ref": "#/$defs/ExternalGrid"
+      },
+      "title": "External Grids",
+      "type": "array"
+    }
+  },
+  "required": [
+    "meta",
+    "loads",
+    "transformers",
+    "external_grids"
+  ],
+  "title": "Case",
+  "type": "object"
+}
\ No newline at end of file
diff --git a/schema/1.5.1/topology.json b/schema/1.5.1/topology.json
new file mode 100644
index 0000000..c1c181c
--- /dev/null
+++ b/schema/1.5.1/topology.json
@@ -0,0 +1,1187 @@
+{
+  "$defs": {
+    "ActivePower": {
+      "properties": {
+        "load_model": {
+          "anyOf": [
+            {
+              "$ref": "#/$defs/LoadModel"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        },
+        "characteristic": {
+          "anyOf": [
+            {
+              "$ref": "#/$defs/Characteristic"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null
+        }
+      },
+      "title": "ActivePower",
+      "type": "object"
+    },
+    "Branch": {
+      "properties": {
+        "node_1": {
+          "title": "Node 1",
+          "type": "string"
+        },
+        "node_2": {
+          "title": "Node 2",
+          "type": "string"
+        },
+        "name": {
+          "title": "Name",
+          "type": "string"
+        },
+        "u_n": {
+          "title": "U N",
+          "type": "number"
+        },
+        "i_r": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "title": "I R"
+        },
+        "r1": {
+          "title": "R1",
+          "type": "number"
+        },
+        "x1": {
+          "title": "X1",
+          "type": "number"
+        },
+        "g1": {
+          "title": "G1",
+          "type": "number"
+        },
+        "b1": {
+          "title": "B1",
+          "type": "number"
+        },
+        "type": {
+          "$ref": "#/$defs/BranchType"
+        },
+        "voltage_system_type": {
+          "$ref": "#/$defs/VoltageSystemType"
+        },
+        "r0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "R0"
+        },
+        "x0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "X0"
+        },
+        "g0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "G0"
+        },
+        "b0": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "B0"
+        },
+        "f_n": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "F N"
+        },
+        "description": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Description"
+        },
+        "energized": {
+          "anyOf": [
+            {
+              "type": "boolean"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Energized"
+        },
+        "length": {
+          "anyOf": [
+            {
+              "type": "number"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Length"
+        },
+        "rn": {
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+      "items": {
+        "$ref": "#/$defs/Load"
+      },
+      "title": "Loads",
+      "type": "array"
+    },
+    "transformers": {
+      "items": {
+        "$ref": "#/$defs/Transformer"
+      },
+      "title": "Transformers",
+      "type": "array"
+    },
+    "external_grids": {
+      "items": {
+        "$ref": "#/$defs/ExternalGrid"
+      },
+      "title": "External Grids",
+      "type": "array"
+    }
+  },
+  "required": [
+    "meta",
+    "branches",
+    "nodes",
+    "loads",
+    "transformers",
+    "external_grids"
+  ],
+  "title": "Topology",
+  "type": "object"
+}
\ No newline at end of file
diff --git a/schema/1.5.1/topology_case.json b/schema/1.5.1/topology_case.json
new file mode 100644
index 0000000..57e708e
--- /dev/null
+++ b/schema/1.5.1/topology_case.json
@@ -0,0 +1,83 @@
+{
+  "$defs": {
+    "ElementState": {
+      "properties": {
+        "name": {
+          "title": "Name",
+          "type": "string"
+        },
+        "disabled": {
+          "default": false,
+          "title": "Disabled",
+          "type": "boolean"
+        },
+        "open_switches": {
+          "items": {
+            "type": "string"
+          },
+          "title": "Open Switches",
+          "type": "array"
+        }
+      },
+      "required": [
+        "name"
+      ],
+      "title": "ElementState",
+      "type": "object"
+    },
+    "Meta": {
+      "properties": {
+        "name": {
+          "title": "Name",
+          "type": "string"
+        },
+        "date": {
+          "format": "date",
+          "title": "Date",
+          "type": "string"
+        },
+        "id": {
+          "format": "uuid",
+          "title": "Id",
+          "type": "string"
+        },
+        "project": {
+          "anyOf": [
+            {
+              "type": "string"
+            },
+            {
+              "type": "null"
+            }
+          ],
+          "default": null,
+          "title": "Project"
+        }
+      },
+      "required": [
+        "name",
+        "date"
+      ],
+      "title": "Meta",
+      "type": "object"
+    }
+  },
+  "properties": {
+    "meta": {
+      "$ref": "#/$defs/Meta"
+    },
+    "elements": {
+      "items": {
+        "$ref": "#/$defs/ElementState"
+      },
+      "title": "Elements",
+      "type": "array"
+    }
+  },
+  "required": [
+    "meta",
+    "elements"
+  ],
+  "title": "Case",
+  "type": "object"
+}
\ No newline at end of file