pywr.nodes.VirtualStorage

class pywr.nodes.VirtualStorage(*args, **kwargs)

A virtual storage unit

Parameters:

model: pywr.core.Model

name: str

The name of the virtual node

nodes: list of nodes

List of inflow/outflow nodes that affect the storage volume

factors: list of floats

List of factors to multiply node flow by. Positive factors remove water from the storage, negative factors remove it.

min_volume: float or parameter

The minimum volume the storage is allowed to reach.

max_volume: float or parameter

The maximum volume of the storage.

initial_volume, initial_volume_pcfloat (optional)

Specify initial volume in either absolute or proportional terms. Both are required if max_volume is a parameter because the parameter will not be evaluated at the first time-step. If both are given and max_volume is not a Parameter, then the absolute value is ignored.

cost: float or parameter

The cost of flow into/outfrom the storage.

Notes

TODO: The cost property is not currently respected. See issue #242.

__init__(model, name, nodes, **kwargs)

Methods

__init__(model, name, nodes, **kwargs)
after(self, Timestep ts, double[)
before(self, Timestep ts)	Called at the beginning of the timestep
check(self)
commit(self, int scenario_index, double value)	Called once for each route the node is a member of
commit_all(self, double[)	Called once for each route the node is a member of
finalise_load()	Finish loading a node by converting parameter name references to instance references.
finish(self)
get_all_cost(self, double[)
get_all_max_volume(self, double[)
get_all_min_volume(self, double[)
get_area(self, ScenarioIndex scenario_index)
get_cost(self, ScenarioIndex scenario_index)	Get the cost per unit flow at a given timestep
get_current_pc(self, ...)	Return the current proportion of full of the storage node.
get_initial_pc(self)	Returns the initial volume as a proportion.
get_initial_volume(self)	Returns the absolute initial volume.
get_level(self, ScenarioIndex scenario_index)
get_max_volume(self, ...)
get_min_volume(self, ...)
pre_load(model, data)	Create a node instance from data.
reset(self)
setup(self, model)	Called before the first run of the model

Attributes

active	active: 'bool'
allow_isolated	A property to flag whether this Node can be unconnected in a network.
area
comment	comment: basestring
component_attrs
components	Generator that returns all of the Components attached to the Node
cost	The cost per unit increased in volume stored
current_pc	Current proportion full.
domain
factors
flow	Total flow via this node in the current timestep
fully_qualified_name
has_fixed_cost	Returns true if cost is not a Parameter.
initial_volume
initial_volume_pc
level
max_volume
min_volume
model	The recorder for the node, e.g. a NumpyArrayRecorder.
name	Name of the node.
nodes
parent	The parent Node/Storage of this object.
prev_flow	Total flow via this node in the previous timestep
recorders	Returns a list of pywr.recorders.Recorder objects attached to this node.
virtual	virtual: 'bool'
volume