Flywheel Storage (Flywheel)¶

Class: Flywheel | Module: energysim.models.storage | Validation benchmarks | Units

Overview¶

Flywheel kinetic energy storage system for high-frequency regulation.

Round-trip efficiency is split symmetrically (sqrt(eta) each way) and the rotor self-discharges proportionally to its SoC. SoC is limited to [0.01, 0.99] by scaling the request.

Parameters¶

Parameter	Type	Default	Unit	Description
`name`	`str`	`'Flywheel'`	-	Unique component name identifier
`power_max_mw`	`float`	`0.5`	MW	-
`energy_capacity_kwh`	`float`	`125.0`	kWh	-
`soc_init`	`float`	`0.5`	1	-
`roundtrip_eff`	`float`	`0.9`	-	-
`self_discharge_pct_hr`	`float`	`1.0`	%/h	-
`step_size`	`float`	`1.0`	s	-

Inputs¶

Variable	Unit	Description
`P_cmd`	MW	Active power setpoint (positive = charge, negative = discharge)

Outputs¶

Variable	Unit	Description
`P_actual`	MW	Net active power exchanged with the grid
`SoC`	1	Rotational kinetic energy state of charge, (omega / omega_max)^2

Validity and notes¶

Validity: seconds-to-minutes duty cycles; no speed-dependent power limit or bearing/windage model beyond the lumped self-discharge.

Usage example¶

from energysim import world
from energysim.models import Flywheel

sim = world(start_time=0, stop_time=3600, t_macro=900)
sim.add_model('flywheel', model=Flywheel(), outputs=['P_actual', 'SoC'], step_size=60)
res = sim.simulate()
print(res['flywheel'].tail(2))