Bump component-graph to 0.6.0 (#1467)

The consumer and producer formulas are no longer clamped, so consumer
power can be negative and producers drawing power count against the
producer total.

Author: shsms

RELEASE_NOTES.md

@@ -2,16 +2,12 @@
 
 ## Summary
 
-<!-- Here goes a general summary of what this release is about -->
+This release updates the microgrid component graph library to v0.6.0, which stops clamping the consumer and producer formulas.  Consumer power can now be negative, and a producer that draws power now makes the producer total less negative instead of counting as zero.
 
 ## Upgrading
 
-<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->
+- The minimum supported version of [`frequenz-microgrid-component-graph`](https://github.com/frequenz-floss/frequenz-microgrid-component-graph-python) is now [v0.6.0](https://github.com/frequenz-floss/frequenz-microgrid-component-graph-python/releases/tag/v0.6.0), which stops clamping the consumer and producer formulas. This changes the values streamed by `microgrid.consumer().power` and `microgrid.producer().power`.
+  - Consumer power used to be clamped at zero. It can now be negative, for example when unmodeled production or a measurement mismatch is larger than the consumption. To get the old result, use `consumer.power.max(Power.zero()).build("consumer_power")`.
+  - Producer power used to clamp each producer at zero. A producer that draws power now adds a positive value instead of zero, so the total can be positive. For example, PV producing 10 kW and a CHP drawing 2 kW used to give -10 kW and now give -8 kW. There is one exception: when the two share a meter below the grid meter, that meter sends data, and `disable_fallback_components` is off, the meter measures them together, so they gave -8 kW before too. `producer.power.min(Power.zero()).build("producer_power")` clamps the total at zero, but it still differs from the old result when one producer draws power while another produces.
+  - With `ComponentGraphConfig(include_phantom_loads_in_consumer_formula=True)`, consumer power is unchanged: it still clamps each of its terms at zero.
 
-## New Features
-
-<!-- Here goes the main new features and examples or instructions on how to use them -->
-
-## Bug Fixes
-
-<!-- Here goes notable bug fixes that are worth a special mention or explanation -->

pyproject.toml

@@ -30,7 +30,7 @@ dependencies = [
   # changing the version
   # (plugins.mkdocstrings.handlers.python.import)
   "frequenz-client-microgrid >= 0.18.3, < 0.19.0",
-  "frequenz-microgrid-component-graph >= 0.5.0, < 0.6",
+  "frequenz-microgrid-component-graph >= 0.6.0, < 0.7",
   "frequenz-client-common >= 0.3.6, < 0.5.0",
   "frequenz-channels >= 1.6.1, < 2.0.0",
   "frequenz-quantities[marshmallow] >= 1.0.0, < 2.0.0",