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Common_concepts
The following is a list of commonly used terms in S2. This can be used as a reference.
In S2, an "Abnormal Condition" is a state of emergency where user comfort may be sacrificed in order to prevent even greater discomfort (e.g. a power outage). What exactly constitutes an emergency depends on local regulation, and might be subject to an audit or financial compensation. The CEM must implement the abnormal condition functionality according to this local regulation. A RM can offer functionality (e.g. an Operation Mode or Transition) which is only allowed to be used by the CEM during Abnormal Conditions, and the CEM must explicitly indicate with Instructions to the RM when there is an Abnormal Condition. Safe operation of the hardware must always be guaranteed and disproportional wear to the hardware must always be prevented; also during an Abnormal Condition.
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In S2, a Commodity is a form of energy that can be consumed or produced by a device, for which the energy flexibility can be optimized by the CEM. Typically this electricity, but S2 also supports natural gas, hydrogen, heat and heating oil. Only energy exchanged with the grid is considered, not any energy exchanges within the device itself.
A Control Type is a way a RM can express its energy flexibility in S2. For more details see Control Type.
When S2 talks about costs, this is never the costs of energy. Instead costs could indicate to the CEM if there are some cost associated with running in a certain mode or activating some flexibility. The logic of the CEM could take these costs into consideration. Examples could be exceptional wear and tear to the device or a contractual fee for activating flexibility.
The cost of energy as defined by the Commodities is not communicated from the RM to the CEM, since the CEM is component that, if relevant, should be aware of the cost of energy; not the RM.
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