Add the set_reactive_power method

RELEASE_NOTES.md

@@ -17,6 +17,8 @@
 
 - The client now inherits from `frequenz.client.base.BaseApiClient`, so it provides a few new features, like `disconnect()`ing or using it as a context manager. Please refer to the [`BaseApiClient` documentation](https://frequenz-floss.github.io/frequenz-client-base-python/latest/reference/frequenz/client/base/client/#frequenz.client.base.client.BaseApiClient) for more information on these features.
 
+- The client now supports setting reactive power for components through the new `set_reactive_power` method.
+
 ## Bug Fixes
 
 <!-- Here goes notable bug fixes that are worth a special mention or explanation -->

src/frequenz/client/microgrid/_client.py

@@ -417,6 +417,34 @@ async def set_power(  # noqa: DOC502 (raises ApiClientError indirectly)
             method_name="SetPowerActive",
         )
 
+    async def set_reactive_power(  # noqa: DOC502 (raises ApiClientError indirectly)
+        self, component_id: int, reactive_power_var: float
+    ) -> None:
+        """Send request to the Microgrid to set reactive power for component.
+
+        Negative values are for inductive (lagging) power , and positive values are for
+        capacitive (leading) power.
+
+        Args:
+            component_id: id of the component to set power.
+            reactive_power_var: reactive power to set for the component.
+
+        Raises:
+            ApiClientError: If the are any errors communicating with the Microgrid API,
+                most likely a subclass of
+                [GrpcError][frequenz.client.microgrid.GrpcError].
+        """
+        await client.call_stub_method(
+            self,
+            lambda: self._async_stub.SetPowerReactive(
+                microgrid_pb2.SetPowerReactiveParam(
+                    component_id=component_id, power=reactive_power_var
+                ),
+                timeout=int(DEFAULT_GRPC_CALL_TIMEOUT),
+            ),
+            method_name="SetPowerReactive",
+        )
+
     async def set_bounds(  # noqa: DOC503 (raises ApiClientError indirectly)
         self,
         component_id: int,