Ontology: HydroPowerPlant and OceanPowerPlant need a new attempt

[han-f]

HydroPowerPlant and OceanPowerPlant need a rework

[han-f]

Andy HdyroPower and Hydroelectricity also need another glance

[akleinau]

So I propose:

• Hydropowerplant
  
  
  
  • OceanPowerplant
  
  
  • ReservoirPowerplant
    
    
    
    
    
    • StorageHydropowerplant
      
      
      - PumpstoragePowerplant
      
      
      - PumpstoragePowerplantWithNaturalInflux
    
    
    
  
  

with definitions:
HydroPowerplant: A HydroPowerplant is an ArtificialObject that is a powerplant using hydropower as its source of energy.
OceanPowerplant: An OceanPowerplant is a HydroPowerplant that is a powerplant using the oceans motion to create electric energy.
ReservoirPowerplant: A ReservoirPowerplant is a HydroPowerplant that uses one or more reservoirs.
StorageHydroPowerplant: A StorageHydroPowerplant is a Powerplant that stores energy in the form of hydro power.
PumpstoragePowerplant: A PumpstoragePowerplant is a StorageHydroPowerplant used to store energy by pumping water from one reservoir to another.
PumpstoragePowerplantWithNaturalInflux: A PumpstoragePowerplantWithNaturalInflux is a StorageHydroPowerplant that works like a PumpstoragePowerplant but has additional natural influx of water to some of the involved reservoirs.

[l-emele]

ReservoirPowerplant: A ReservoirPowerplant is a HydroPowerplant that uses one or more reservoirs.
StorageHydroPowerplant: A StorageHydroPowerplant is a Powerplant that stores energy in the form of hydro power.

Those two definitions are too similar.

PumpstoragePowerplantWithNaturalInflux should be a subclass of PumpstoragePowerplant as every PumpstoragePowerplantWithNaturalInflux is still a PumpstoragePowerplant.

[l-emele]

Additionally:

StorageHydroPowerplant: A StorageHydroPowerplant is a Powerplant that stores energy in the form of hydro power.

Alternative prosal: A StorageHydroPowerplant is a Powerplant that stores energy in the form of potential energy of water in a reservoir.

[akleinau]

delete the classes for now

[l-emele]

From today's OEO dev meeting 17:

New classes:

• hydro power generating unit: _A hydro power generating unit is a power generating unit that uses hydro energy._ (analogous to wind)
  relation: has_part some water turbine
• hydro power plant: _A hydro power plant is a power plant having an aggregate of hydro power generating units as its power generating units parts._
  'participates in' some 'hydroelectric energy transformation'
• run of river power plant: _A run of river power plant is a hydro power plant that uses the momentarily available hydro energy of a river._ (turbine + dam + river)
• hydro storage power plant: _A hydro storage power plant is a hydro power plant that uses the available hydro energy of a stationary water storage._ (turbine + dam + reservoir)
  alternative term: storage power plant (turbine + dam + river)
• pumped hydro storage power plant: _A pumped hydro storage power plant is a hydro storage power plant which has some pumps._

Delete classes as it is basically the same process, only the power plants differ:

• hydroelectric dam energy transformation
• run-off-river energy transformation

Minor things:

• Fix typo by deleting an n: _Hydroelectric energy transformation is an hydro energy transformation that converts hydro energy to electrical energy._

Open:

• Axiomatic distinction between run of river power plant and hydro storage power plant. For the moment, add editorial note on run of river power plant and hydro storage power plant: distinction is important for modelling, but in reality not so easy
• Definition of river.
  Definition from ENVO: _A stream which, through permanent or seasonal flow processes, moves from elevated land towards lower elevations through a definite channel and empties either into a sea, lake, or another river or ends on land as bed seepage and evapotranspiration exceed water supply._
• Definition of pump
• Subclasses of water, see #681
• Subclasses of pumped hydro storage power plant
  
  
  
  • ... with natural intake
  
  
  • ... without natural intake
  
  
• Definition of hydro energy: maybe put 'potential' before 'kinetic' in definition as potential energy has even in run-off river power plants more impact than kinetic energy
• Everything ocean energy related. Separate issue?

General:

• New pattern for power plant definitions: _A XYZ powerplant is a powerplant that has XYZ power units as parts._ => Separate issue #750

[l-emele]

Regarding the distinction between run of river power plants and hydro storage power plant and the distinction between pumped hydro storage power plants with and without natural intake. Via Wikipedia I found the following ENTSO-E definitions with a special focus on modelling:

a) Run-of-River and Pondage: Plants that do not have pumping capacity, do not have reservoirs, or have small reservoirs with a maximum of 24 hours of storage. (Reservoir Capacity / Net Generating Capacity ≤ 24 hours).
b) Reservoir: This category contains hydro plants that have reservoirs, but do not have pumping capacity. They are pure generation plants with reservoirs with a storage capacity higher than 24 hours. (Reservoir Capacity / Net Generating
Capacity > 24 hours).
c) Open-loop Pump Storage: This category contains hydro plants that have Pumping capacity/technology in place, irrespectively of reservoir size, and that have Natural Inflows.
d) Closed-loop Pump Storage: This category contains hydro plants that have Pumping capacity/technology in place, irrespectively of reservoir size, and that do not have Natural Inflows.

Source: ENTSO-E; Hydropower modelling – New database complementing PECD. V.1.0, 12 September 2019, page 6.

[stap-m]

With respect to the ENTSO-E def, we could extend the def of run of river:
_A run of river power plant is a hydro power plant that uses the momentarily available hydro energy of a river. It has either no reservoir or just has a small one with a maximum of 24 hours of storage._

It also gives good input for the pumped hydro storage power plant:

• open-loop pumped hydro storage power plant: _An open-loop pumped hydro storage power plant is a pumped hydro storage power plant that has natural inflows._
• closed-loop pumped hydro storage power plant: _A closed-loop pumped hydro storage power plant is a pumped hydro storage power plant that has no natural inflows._

Do we want a class like reservoir hydro storage power plant as subclass of hydro storage power plant, that explicitly excludes a pump?

[stap-m]

Definition of hydro energy: maybe put 'potential' before 'kinetic' in definition as potential energy has even in run-off river power plants more impact than kinetic energy

As far as I remember, we agreed on that already.

[l-emele]

Definition of hydro energy: maybe put 'potential' before 'kinetic' in definition as potential energy has even in run-off river power plants more impact than kinetic energy

As far as I remember, we agreed on that already.

In the pad of oeo dev 17 we wrote:

water turbine: potential energy has more impact than kinetic energy -> maybe put 'potential' before 'kinetic' in definition

The word _maybe_ highlighted by me. But if we now have a consensus I am happy with changing the def.

[stap-m]

The word maybe highlighted by me. But if we now have a consensus I am happy with changing the def.

Ok. At least I'm in favour for that change. Any objections by others @OpenEnergyPlatform/oeo-domain-expert-energy-modelling ?

[l-emele]

For pump: We defined a turbine as: _A turbine is an energy converting device that converts energy from a moving fluid flow into rotational energy._ As a pump is an inverted turbine, we could define pump as: _A pump is an energy converting device that converts rotational energy into energy of a moving fluid._

[l-emele]

For river I created a separate issue #760.

[l-emele]

water turbine: potential energy has more impact than kinetic energy -> maybe put 'potential' before 'kinetic' in definition

The word maybe highlighted by me. But if we now have a consensus I am happy with changing the def.

Ok. At least I'm in favour for that change. Any objections by others @OpenEnergyPlatform/oeo-domain-expert-energy-modelling ?

No objections for a week, so I will implement this.

I also added to the following editor note: _The distinction between a run of river powerplant and an hydro storage powerplant is important for modelling, but in reality not so easy. The chosen distinction follows the document: European Network of Transmission System Operators for Electricity (ENTSO-E): Hydropower modelling – New database complementing PECD, V.1.0, 12 December 2019, https://www.entsoe.eu/Documents/SDC%20documents/MAF/2019/Hydropower_Modelling_New_database_and_methodology.pdf_

For ocean energy and related terms I will create a separate issue.

So last remaining question in this issue:

Do we want a class like reservoir hydro storage power plant as subclass of hydro storage power plant, that explicitly excludes a pump?

[stap-m]

As a pump is an inverted turbine, we could define pump as: _A pump is an energy converting device that converts rotational energy into energy of a moving fluid._

There're also other kinds of pumps. It's not necessarily rotational energy and for compressible fluids, e.g. air, a pump can also convert into potential energy.

[l-emele]

What about: _A pump is an energy converting device that converts rotational energy into kinetic energy and potential energy of a fluid._?

Btw, we do not yet have fluid, but should define it. I'll create an issue for that.

[stap-m]

_A pump is an energy converting device that converts energy into kinetic or potential energy of a fluid._?

[l-emele]

Sounds good, I'll implement this new pump definition.

[l-emele]

Do we want a class like reservoir hydro storage power plant as subclass of hydro storage power plant, that explicitly excludes a pump?

I created a separate issue for that #767 as this issue and pull request #758 already cover a lot of things.