CGMES ground conversion

cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/Conversion.java

@@ -181,6 +181,7 @@ public Network convert(Reporter reporter) {
             convert(cgmes.busBarSections(), bbs -> new BusbarSectionConversion(bbs, context));
         }
 
+        convert(cgmes.grounds(), g -> new GroundConversion(g, context));
         convert(cgmes.energyConsumers(), ec -> new EnergyConsumerConversion(ec, context));
         convert(cgmes.energySources(), es -> new EnergySourceConversion(es, context));
         convf = eqi -> new EquivalentInjectionConversion(eqi, context);

cgmes/cgmes-conversion/src/main/java/com/powsybl/cgmes/conversion/elements/GroundConversion.java

@@ -0,0 +1,32 @@
+/**
+ Copyright (c) 2024, RTE (http://www.rte-france.com)
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ * SPDX-License-Identifier: MPL-2.0
+ */
+package com.powsybl.cgmes.conversion.elements;
+
+import com.powsybl.cgmes.conversion.Context;
+import com.powsybl.iidm.network.*;
+import com.powsybl.triplestore.api.PropertyBag;
+
+/**
+ * @author Luma Zamarreño {@literal <zamarrenolm at aia.es>}
+ */
+public class GroundConversion extends AbstractConductingEquipmentConversion {
+
+    public GroundConversion(PropertyBag ec, Context context) {
+        super("Ground", ec, context);
+    }
+
+    @Override
+    public void convert() {
+        GroundAdder adder = voltageLevel().newGround();
+        identify(adder);
+        connect(adder);
+        Ground g = adder.add();
+        addAliasesAndProperties(g);
+        convertedTerminals(g.getTerminal());
+    }
+}

cgmes/cgmes-model/src/main/java/com/powsybl/cgmes/model/CgmesModel.java

@@ -152,6 +152,10 @@ default PropertyBags graph() {
         return new PropertyBags();
     }
 
+    default PropertyBags grounds() {
+        return new PropertyBags();
+    }
+
     CgmesDcTerminal dcTerminal(String dcTerminalId);
 
     void clear(CgmesSubset subset);

cgmes/cgmes-model/src/main/java/com/powsybl/cgmes/model/triplestore/CgmesModelTripleStore.java

@@ -590,6 +590,11 @@ public PropertyBags graph() {
         return namedQuery("graph");
     }
 
+    @Override
+    public PropertyBags grounds() {
+        return namedQuery("grounds");
+    }
+
     @Override
     public PropertyBags modelProfiles() {
         return namedQuery(MODEL_PROFILES);

cgmes/cgmes-model/src/main/resources/CIM16.sparql

@@ -1101,6 +1101,17 @@ WHERE {
 }}
 }
 
+# query: grounds
+SELECT *
+WHERE {
+{ GRAPH ?graph {
+    ?Ground
+        a cim:Ground ;
+        cim:IdentifiedObject.name ?name .
+    ?Terminal cim:Terminal.ConductingEquipment ?Ground .
+}}
+}
+
 # query: update
 DELETE { GRAPH <{0}>
     { ?subject ?predicate ?value }