Damping Network for Flywheel Torsional Oscillations
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Solution Overview
Problem
Large inertial energy storage systems, such as those employing flywheels and rotating electrical machinery, often experience torsional oscillations during energy discharge, leading to system instability and potential loss of synchronism, especially when dealing with pulsating loads like radar systems, as existing solutions fail to adequately address both recurrent and non-recurrent load pulsations.
Innovation Solution
A system and method utilizing a rotating energy storage system with a triply-fed induction machine coupled to an inertial flywheel and a damping network that absorbs energy at a controlled rate to regulate torsional oscillations, featuring a damping network with adjustable inductance, capacitance, and resistance to match the mechanical and electrical resonant frequencies, thereby damping oscillations effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a damping network is added to regulate torsional oscillations, then system stability is improved, but device complexity increases
Solution Approach 1:
A damping network is introduced as an intermediary component between the inertial energy storage system and the pulsed load. This network includes controllable impedance elements (resistors, inductors, capacitors) that act as mediators to absorb and dissipate torsional oscillations, preventing them from propagating through the mechanical system while maintaining electrical power transfer functionality.
Solution Approach 2:
The damping network utilizes controllable impedance elements whose electrical parameters (resistance, inductance, capacitance) can be dynamically adjusted. By changing these parameters in response to detected oscillation conditions, the system optimizes damping effectiveness without requiring permanent structural modifications, thus managing complexity through software/control rather than hardware multiplication.
2Reliability
If the damping network absorbs energy at a controlled rate, then torsional oscillations are regulated, but energy transfer efficiency decreases
Solution Approach 1:
The damping network is designed to absorb only the portion of energy that corresponds to torsional oscillations, rather than absorbing all energy transfers. The controllable impedance elements are activated selectively based on oscillation detection, allowing normal energy transfer to proceed efficiently while dissipating only the harmful oscillatory components through controlled resistance.
Solution Approach 2:
The damping network operates periodically rather than continuously, activating impedance elements in response to detected oscillation events. This periodic engagement allows energy to transfer efficiently during normal operation while providing damping only when torsional oscillations are present, minimizing overall energy loss.
3Reliability
If the mechanical resonant speed is raised above operational limits, then rotor vibration is prevented, but the operating range of the energy storage system is reduced
Solution Approach 1:
Instead of mechanically redesigning the flywheel or motor to change resonant characteristics, the patent substitutes an electrical damping mechanism. The damping network modifies the electrical load seen by the motor, which in turn affects the mechanical resonance behavior without requiring physical changes to the rotating mass or mechanical structure, preserving the original operating range.
Solution Approach 2:
The system dynamically changes electrical parameters of the damping network to shift the effective resonant frequency. By adjusting impedance values in real-time, the resonant peak can be moved above the operational speed range when needed, while allowing the system to operate freely across its full mechanical speed range when oscillations are not present.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively damps torsional oscillations across a wide range of load types and pulsing rates, raising the mechanical resonant speed above operational limits to prevent rotor vibration and bearing failure, while providing dynamic braking to reduce oscillations, thus enhancing system stability and extending the operating range of energy storage systems.
Implementation Method 1
a damping network configured to receive and absorb a second portion of the energy at a controlled rate to regulate torsional oscillations
Implementation Method 2
a triply-fed induction machine coupled to an inertial flywheel and comprising multiple stator ports and at least one rotor port
Implementation Method 3
store the energy in the flywheel, and deliver a first portion of the energy to a first pulsed load
Implementation Method 4
an inertial flywheel, the induction machine configured to receive electrical energy from the power source, store the energy in the flywheel
Data Source
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AI summary
An energy storage system includes a power source (104) configured to generate power. The energy storage system also includes an induction machine (102) coupled to an inertial flywheel (120), the induction machine configured to receive electrical energy from the power source, store the energy in the flywheel, and deliver a first portion of the energy to a first pulsed load. The energy storage system further includes a damping network (110) configured to receive and absorb a second portion of the energy at a controlled rate to regulate torsional oscillations in a rotary motion of the flywheel caused by load swings or pulsations of the first pulsed load.