Add units-aware getters/setters for power system components

Project.toml

@@ -5,6 +5,7 @@ version = "5.3.0"
 
 [deps]
 CSV = "336ed68f-0bac-5ca0-87d4-7b16caf5d00b"
+Unitful = "1986cc42-f94f-5a68-af5c-568840ba703d"
 DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
@@ -35,6 +36,7 @@ Logging = "1"
 PowerFlowData = "^1.5"
 PrettyTables = "2.4, 3.1"
 TimeSeries = "0.25"
+Unitful = "^1.12"
 UUIDs = "1"
 Unicode = "1"
 YAML = "~0.4"

src/PowerSystems.jl

@@ -565,6 +565,11 @@ export StructDefinition
 export generate_struct_file
 export generate_struct_files
 export UnitSystem # internal.jl
+# Unit types for explicit units in getters/setters
+export MW, Mvar, MVA, kV, OHMS, SIEMENS
+export DU, SU, DeviceBaseUnit, SystemBaseUnit
+export AbstractRelativeUnit, RelativeQuantity
+export ustrip
 
 # ComponentSelector
 export ComponentSelector
@@ -676,6 +681,20 @@ import InfrastructureSystems:
     NormalizationTypes,
     UnitSystem,
     SystemUnitsSettings,
+    # Unit types for explicit units in getters/setters
+    MW,
+    Mvar,
+    MVA,
+    kV,
+    OHMS,
+    SIEMENS,
+    DU,
+    SU,
+    DeviceBaseUnit,
+    SystemBaseUnit,
+    AbstractRelativeUnit,
+    RelativeQuantity,
+    ustrip,
     open_file_logger,
     make_logging_config_file,
     validate_struct,

src/base.jl

@@ -3192,15 +3192,16 @@ function convert_component!(
     new_type::Type{StandardLoad};
     kwargs...,
 )
+    # Use direct field access for unit-aware fields to preserve internal representation
     new_load = new_type(;
         name = get_name(old_load),
         available = get_available(old_load),
         bus = get_bus(old_load),
-        base_power = get_base_power(old_load),
-        constant_active_power = get_active_power(old_load),
-        constant_reactive_power = get_reactive_power(old_load),
-        max_constant_active_power = get_max_active_power(old_load),
-        max_constant_reactive_power = get_max_active_power(old_load),
+        base_power = old_load.base_power,
+        constant_active_power = old_load.active_power,
+        constant_reactive_power = old_load.reactive_power,
+        max_constant_active_power = old_load.max_active_power,
+        max_constant_reactive_power = old_load.max_reactive_power,
         conformity = get_conformity(old_load),
         dynamic_injector = get_dynamic_injector(old_load),
         internal = _copy_internal_for_conversion(old_load),

src/definitions.jl

@@ -532,6 +532,7 @@ Enumeration representing the location of a hydro reservoir relative to its assoc
 
 const PS_MAX_LOG = parse(Int, get(ENV, "PS_MAX_LOG", "50"))
 const DEFAULT_BASE_MVA = 100.0
+const DEFAULT_POWER_UNITS_TYPE = typeof(0.0 * IS.MW)
 
 const POWER_SYSTEM_STRUCT_DESCRIPTOR_FILE =
     joinpath(dirname(pathof(PowerSystems)), "descriptors", "power_system_structs.json")