271 results about "Flywheel energy storage system" patented technology

Featured are methods for regulating the AC frequency of the electrical power be supplied on an electrical distribution system or grid. Such a method includes electrically coupling an energy storage sub-system to the electrical distribution network, where the energy storage sub-system includes one or more flywheel energy storage systems. Also featured as devices, systems and apparatuses embodying such methodologies or for use in implementing such methodologies of the present invention.

A low inductance electrical machine which may be used as an alternator or motor with low armature inductance is disclosed. Arrangements of complementary armature windings are presented in which the fluxes induced by currents in the armature windings effectively cancel leading to low magnetic energy storage within the machine. This leads to low net flux levels, low core losses, low inductance and reduced tendency toward magnetic saturation. Separately excited field arrangements are disclosed that allow rotor motion to effect brushless alternator or brushless motor operation. An exemplary geometry includes a stator including two toroidal rings and a concentric field coil together with a rotor structure separated from the stator by four air gaps. An alternate embodiment allows for counter-rotation of two rotor elements for use as a flywheel energy storage system in which the external gyroscopic effects cancel.

A flywheel energy storage system emphasizing enhancements developed for space applications including development of a flywheel rotor system capable of achieving maximum energy density, while being capable of repeated high peak-power demands. Illustrated is a rotor system comprising a composite hub, capable of supporting an optimized high-speed composite rim and shaft, working in combination with a switched reluctance motor.

A flywheel energy storage system (10) includes a vacuum enclosure (18) having a flywheel (12), motor / generator (14), and a shaft (16) enclosed within. The flywheel and motor / generator combination are designed to minimize bearing loads and thus increase system life, reliability and safety.

The invention discloses a flywheel energy storage system grid-connected control method and an energy storage system thereof. A grid side converter control method of the flywheel energy storage system grid-connected control method comprises the following steps: converting grid side currents ia1, ib1 and ic1 and converter side currents ia2, ib2 and ic2 under a static coordinate system into direct current components id1 and iq1, and id2 and iq2 under a two-phase rotating coordinate system respectively; and taking the direct current components under the two-phase rotating coordinate system as feedback signals of grid side converter control under the rotating coordinate system to control the sizes and the flow directions of flywheel energy storage system grid-connected active power and passive power. A motor side converter control method of the flywheel energy storage system grid-connected control method comprises the following steps: converting motor stator currents ia3, ib3 and ic3 under the static coordinate system into direct current components id3, iq3 under the two-phase rotating coordinate system; and taking the id3, iq3 and direct current bus voltage Udc as feedback signals of motor side converter control under the rotating coordinate system to maintain constant direct current bus voltage Udc. An LCL filter (102) of the energy storage system applying the control method consists of a grid side inductor (201), a converter side inductor (203) and a filter capacitor (202).

Featured is a heat transferring device being configured and arranged so that at least some of the heat energy being generated by a heat producing device, such as the a bearing assembly of a flywheel energy storage system, is communicated directly from the locus of the device directly to a heat sink structure remote from the locus of the device. The heat-transferring device includes one or more flexible thermally conductive members, one end of each being thermally coupled to the heat generating device and the other end of each being thermally coupled to the heat sink. The flexible member also is configured and arranged so as to allow relative motion between the heat generating device and the heat sink in or about one or more directions or axes. The heat-transferring device further includes first and second conductive members that are each configured and arranged to thermally couple each flexible member end to one of the heat producing device and the heat sink.

A flywheel energy storage system includes a driving wheel rotatable relative to a first axis; an electric motor for driving the driving wheel; an electric generator; a driven wheel adapted to drive the electric generator; a flywheel rotatable relative to a second axis parallel to the first axis; a clutch assembly for engagement or disengagement of the flywheel and the driven wheel; and a transmission gear train assembly engagingly interposed between the flywheel and the driving wheel adapted for conveying kinetic energy from the driving wheel to the flywheel. The transmission gear assembly is provided for allowing the flywheel driven by a low-powered electric motor to drive a high-powered electric generator.

A crash management system for implementation in a flywheel energy storage system (FESS) is provided. Implementation of such a system entails designing an FESS rim that is highly failure resistant, and designing the FESS such that if one, some, or even all of its components fail, they are physically prevented from accumulating and releasing enough energy to cause rim burst, thus leaving the rim intact and capable of safely remaining spinning even after one or more FESS component failures have occurred.

A system for placing and maintaining a computer in a standby mode during power failure, the system comprising: a mains power failure sensor; a source of standby power, the source of standby power being less than the power available for full operation; a volatile memory arranged to be powered from the source of standby power in the event of a failure of mains power; and a processor operative responsive to the mains power failure sensor to store status information on the volatile memory and reduce power demand of the processor and associated devices to no more than that available from the source of standby power. In an exemplary embodiment the source of standby power is one of a battery, a capacitor, a flywheel energy storage system and a power over Ethernet connection.

An axial stabilizer for the rotor of a magnetic bearing provides external control of stiffness through switching in external inductances. External control also allows the stabilizer to become a part of a passive / active magnetic bearing system that requires no external source of power and no position sensor. Stabilizers for displacements transverse to the axis of rotation are provided that require only a single cylindrical Halbach array in its operation, and thus are especially suited for use in high rotation speed applications, such as flywheel energy storage systems. The elimination of the need of an inner cylindrical array solves the difficult mechanical problem of supplying support against centrifugal forces for the magnets of that array. Compensation is provided for the temperature variation of the strength of the magnetic fields of the permanent magnets in the levitating magnet arrays.

The objective of the invention is to provide an auxiliary support for a vertical magnetic suspension flywheel rotor. The auxiliary support comprises an upper auxiliary support assembly and a lower auxiliary support assembly, respectively located at an upper end and a lower end of a vertical flywheel rotor shaft; an upper supporting sleeve, a lower supporting sleeve and a lower bearing sleeve are respectively mounted between the rotor shaft and a bearing, the upper supporting sleeve and the lower supporting sleeve are respectively in interference fit with the shaft, the exterior surface of the lower supporting sleeve comprises an outer cylindrical surface and a conical surface, and the interior surface of the lower supporting sleeve comprises an inner cylindrical surface and a conical surface. The invention has the following beneficial effects: the auxiliary support can realize safe and reliable supporting of the energy storage flywheel rotor during high speed rotation, falling and standstill of the flywheel rotor and enables the rotor to rapidly enter to an automatic centering state in virtue of guiding of the conical surfaces when the flywheel rotor shaft falls, so impact and vibration are effectively reduced, thereby improving the service life, safety and reliability of a flywheel energy storage system.

An optimized flywheel energy storage system utilizing magnetic bearings, a high speed permanent magnet motor / generator, and a flywheel member. The flywheel system is constructed using a high strength steel wheel for kinetic energy storage, high efficiency magnetic bearings configured with dual thrust acting permanent magnet combination bearings, and a high efficiency permanent magnet motor generator. The steel wheel provides a cost effective, high speed construction for the energy storage rotor.

The invention relates to a rail-traffic regenerative-braking-energy comprehensive recovery and utilization device and method. The rail-traffic regenerative-braking-energy comprehensive recovery and utilization device is provided with an alternating voltage detecting module, a direct voltage detecting module, a logical control unit, a flywheel energy storage system and an inverter. The flywheel energy storage system conducts action to provide electric energy for or absorb electric energy from a traction network direct current bus according to the magnitude of a traction network direct current bus voltage value and a self SOC value state; and the inverter determines whether traction network direct current bus voltage is absorbed or not by combining the magnitude of the traction network direct current bus voltage value and the SOC state of the flywheel, if the feedback power of the inverter is relatively small, the power is fed back to a low-voltage alternating-current power supply network, and if the feedback power of the inverter is relatively large, the power is fed back to a power distribution network. According to the rail-traffic regenerative-braking-energy comprehensive recovery and utilization device and method, the quality of power-grid electric energy is prevented from being reduced after an inverter feedback device is used, by combining the infinite-capacity continuous working characteristic of the flywheel energy storage system, a part of energy which cannot be absorbed by the flywheel energy storage system after the flywheel energy storage system is fully charged is absorbed, rail-traffic train regeneration is prevented from automatically losing efficacy, and energy conservation is obvious.

The invention relates to a flywheel energy storage system and a control method thereof. The flywheel energy storage system comprises two three-phase voltage type PWM converters, an LCL filter and a direct current support capacitor; the two three-phase voltage type PWM converters are connected with each other through the direct current support capacitor connected with a direct current bus in parallel, wherein one three-phase voltage type PWM converter is connected with a power grid side through the output LCL filter while the other three-phase voltage type PWM converter is connected with a permanent magnet synchronous motor for powering the armature winding of the stator of the permanent magnet synchronous motor. The control method is achieved based on the control of a complex vector PI current regulator, and comprises a control strategy on the three-phase voltage type PWM converter at the power grid side, and a control strategy on the three-phase voltage type PWM converter at the motor side; according to the control method, dependence of the system on circuit parameters is eliminated, robustness of the system is increased, the pole-zero of the complex vector PI current regulator can be completely counteracted without being influenced by change of inductance parameters and the like, and thereby control performance is more outstanding.

The invention discloses a rotor position robust observation method used for a flywheel energy storage system. The rotor position robust observation method comprises the steps of establishing a composite counter electromotive force model sliding-mode observer firstly, and next, by taking composite counter electromotive force estimation value feedback of a current state equation in a two-phase static coordinate as system disturbance, enabling a virtual parameter identification method-based multimode disturbance observer to perform accurate evaluation on the rotor position information; meanwhile,performing fuzzy prediction on the positioning torque of an FSPM motor by the virtual parameter identification method-based multimode disturbance observer, and further improving the positioning torque prediction precision of the FSPM motor through an error online training compensator; and meanwhile, performing control by taking the positioning torque as known disturbance. By virtue of the rotor position robust observation method, the positioning torque prediction value of the FSPM motor can quickly and accurately follow a real value, so that wide-speed-range position-free accurate tracking ofthe FSPM motor used for the flywheel energy storage system in different working condition operating conditions can be realized.

The invention belongs to the field of electrotechnics, discloses a vertical type magnetic suspension flywheel energy storage system, and provides a vertical type magnetic suspension flywheel energy storage system advantaged in high rotating speed, low standby loss and low cost, mainly for the purpose of solving the structural defect existing in a conventional flywheel energy storage system in the prior art. The vertical type magnetic suspension flywheel energy storage system is mainly characterized in that a rotating shaft connecting a motor with a flywheel is omitted, the motor is designed to be of an external rotor structure and an external rotor of the motor is arranged on the inner wall of the cylindrical flywheel. A sufficient centripetal force is provided for the motor rotor rotating at a high speed by use of the feature that the flywheel itself is high in structural strength such that the design requirement for high rotating speed of the flywheel energy storage system is satisfied. A radial suspension portion in a support system employs a design of a permanent magnetic suspension bearing so that the design requirements for low cost and low standby loss are met; and the vertical type magnetic suspension flywheel energy storage system can be widely applied to such occasions as power grid peak adjustment and frequency modulation, an uninterrupted power supply, aerospace and the like.

The invention discloses a distributed hierarchical control method for a flywheel matrix system applied to a wind power plant, and a control method for a flywheel energy storage system applied to wind power plant, and particularly relates to a cooperative control method for the hierarchical structure of a flywheel energy storage matrix system applied to wind power plant. The distributed hierarchical control method comprises the following steps of: establishing the communication topological structure of each flywheel energy storage unit at first, and then constructing a multi-agent-based distributed upper-layer power allocation algorithm, determining the own charge-discharge state and power of each flywheel by allocating the total reference power of the system in a ratio according to the exchange information of each flywheel and the neighbours thereof, and submitting the calculated results to a local controller to execute, so as to realize the purpose of the invention; therefore, the distributed hierarchical control method has real-time performance, and can reduce construction cost, improve system flexibility, reduce system computation complexity, and enhance system robustness and fault tolerance.

A system for decoupling a rotor from a stator of a permanent magnet motor and a flywheel storage system using the same are provided. The flywheel storage system uses the permanent magnet motor as a magnetic active coupler to minimize magnetic losses in flywheel energy storage system during the motor-generator electric power transfer for enabling a magnetic field weakening method and a way of cancelling the losses during a conservative mode where the stator is totally decoupled from the rotor. Also, the present invention enables the optimal sizing of a permanent motor-generator to be able to supply a constant power over a large range of rotating speeds.

The invention relates to an aircraft braking energy recovery system based on flywheel energy storage. The system consists of a special motor on a front wheel of an aircraft, a motor power converter, a set of flywheel energy storage system and a braking energy recovery system controller, wherein the braking energy recovery system controller is used for controlling the motor power converter and the flywheel energy storage system. Braking energy produced in the processes of taking off and landing of the aircraft on a runway can be recovered to be used for the low-speed sliding of the aircraft between the runway and an airport terminal. After the aircraft braking energy recovery system based on flywheel energy storage is adopted, the time for using an aero-engine and a ground trailer can be remarkably shortened in the sliding period of the aircraft, the fuel consumption is reduced, the noise pollution and the emission of greenhouse gases can be reduced, the crowding phenomenon of a boarding gate and a parking apron can be relieved, and the take off on time performance is increased.

The invention relates to the technical field of motor control, in particular to a power conversion device applied to a high-speed flywheel energy storage system. The power conversion device comprises a half-bridge driving circuit, an energy feedback circuit, a bidirectional Buck-Boost conversion circuit and a wave circuit. The power conversion device has the advantages that the energy bidirectional flowing of the flywheel energy storage system can be realized; the four-quadrant operation of a high-speed flywheel energy storage motor can be realized; the energy feedback circuit is used, so that the utilization rate of energy is greatly improved; the operation efficiency of the flywheel energy storage system is improved; the structure is simple and reliable; the risk of through short circuit is avoided; the operation safety of the high-speed flywheel motor is improved.

A flywheel energy storage system includes a rotating assembly having a plurality of magnets and a longitudinal axis about which the rotating assembly rotates and static assembly having a stator configured to magnetically interact with the plurality of magnets of the rotating assembly. The rotating assembly includes a rotor back iron supporting the plurality of magnets and disposed further from the longitudinal axis in a radial direction than the plurality of magnets. The back iron being formed of a material having a first stiffness, relative permeability of at least 10, and an electrical conductivity 10% or less than the electrical conductivity of magnetic steel. There is composite structure supporting the rotor back iron and disposed further from the longitudinal axis in a radial direction than the rotor back iron. The composite structure comprises a composite material having a second stiffness, which is greater than the first stiffness.

A method for designing the precession crossover parameters of the maglev high-speed rotor system, establishing the complex coefficient dynamic model of the maglev closed-loop rotor system, drawing the negative frequency Nyquist curve of the complex coefficient open-loop transfer function at the highest speed and calculating the low-pass cut-off frequency of the precession crossover , and then determine the correction target at the highest speed according to the phase angle margin requirements of the precession mode, search the design frequency and determine the precession cross gain at the highest speed, and then determine the precession cross gain in the entire speed range to ensure that the rotor advances The phase angle stability margin in the whole speed range realizes the robust and stable design of precession cross feedback. Based on the negative frequency Nyquist curve, the present invention proposes a method for designing the precession cross parameters of the maglev high-speed rotor system from the phase angle margin. Compared with the usual multivariable system design method such as the state space analysis method, it is not only very intuitive, but also has good robustness. Rod, so it is more suitable for use in centrifuges, high-precision CNC lathes, turbines, energy storage flywheels, and practical magnetic suspension high-speed rotor systems such as magnetic suspension flywheels and magnetic suspension control torque gyroscopes.

The invention relates to a design method of a flywheel energy-storage energy management system for improving the wind power integration power quality. The method is characterized in that, along with the remarkably increasing process of the wind power permeability, the cluster wind power integration greatly influences the power quality of a power system, especially the voltage quality of the power system. The flywheel energy storage has active and reactive independent-adjustment capabilities. According to the technical scheme of the invention, an energy management optimized model applied to a flywheel energy storage system for improving the power quality of the power system is designed. The model is designed based on a double-layer decision-making model. In order to improve the power quality, a superstratum solves out the charging and discharging power of an energy storage device according to the state of the energy storage device and the fluctuation quantity of the wind power based on the fuzzy algorithm. Meanwhile, a substratum designs a substratum control scheme of the energy storage system according to the mathematic model of the flywheel energy storage system. based on the above model, the wind power and the energy storage are cooperated to improve the utilization efficiency of the energy storage device, so that the wind power integration power quality is improved. Specifically, the method is scientific, reasonable, high in applicability and good in effect.

The invention relates to a controller applied to a power grid side converter of a flywheel energy storage system. The controller comprises a simulation module, a current control module, a control system, the converter and an equivalent flywheel energy storage system model. The controller is characterized by simulating and analyzing the dynamic response performance of the power grid side power converter operating in rectification and inversion states and researching the correctness of the designed system and parameters. The topological structure of the power grid side converter is researched, a mathematical model of the power grid side converter is created, and a simulation model of the power grid side converter is constructed; according to the requirement of the balance of energy transmission between the flywheel energy storage system and a power grid, a current control technique for the power grid side converter, the control of active power and reactive power and a decoupling control policy are researched; a mathematical model of the post-coupling control system is given, control parameters are designed on the basis of an engineering design method, and a simulation program of the control system is constructed; a power grid voltage phase angle phase-locked loop technique and a PWM (Pulse-Width Modulation) control method for the converter are analyzed and researched, and an appropriate control method is chosen to meet the required total harmonic distortion index of alternating-current side power grid current.

A life counter that calculates and records the life utilized of the flywheel in a flywheel energy storage system and indicates when it should be removed from service, based on operational history instead of monitoring for symptoms of failure. The life counter can effectively monitor and measure any or all of the flywheel energy storage system parameters, such as the flywheel structural life, vacuum system life, bearing system life and electronics life. The life counter ensures safe operation of highly stressed flywheels by indicating when the safety margin for the flywheel is reached so that the flywheel energy storage system can be removal from service prior to encountering a risk of catastrophic failure. In some cases, failures may not be preceded by measurable warning symptoms, so removal from service at a calculated end of life would be desirable. The life counter can indicate that the flywheel system should be removed from service by several methods that include triggering an alarm, displaying a reading, altering operation or stopping operation. The life can be indicative of the flywheel structural life, as adjusted by a suitable safety factor, or electronics high power cycle life.

The invention relates to a flywheel energy storage propelling device. The flywheel energy storage propelling device comprises a motor unit, a transmission device, a flywheel energy storing system, an energy releasing device, a guide rope, a pulley block, a tackle and a tackle rail. The flywheel energy storage propelling deice is suitable for ejecting and propelling objects of different mass classes, such as unmanned aerial vehicles, warplanes, early warning airplanes, rockets, guided missiles and the like according to a reserved parameter change curve. The ejection process is controllable, and the changing processes of acceleration, speed, sliding distance and the like can be optimized according to needs and the mass magnitude of the airplanes, the guided missiles or the rockets.