CN102957159A - Energy recovery device based on vacuum flywheel energy storage and energy recovery method thereof - Google Patents
Energy recovery device based on vacuum flywheel energy storage and energy recovery method thereof Download PDFInfo
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Abstract
The invention relates to an energy recovery device used for a variable frequency system of a motor, in particular to an energy recovery device for carrying out dynamic equilibrium on DC (direct current) bus voltage of the variable frequency system and an energy recovery method thereof. The energy recovery device comprises a bi-directional DC/AC (alternating current) converter and a vacuum energy storage flywheel, wherein the bi-directional DC/AC converter is respectively connected with a DC bus of the variable frequency system and the vacuum energy storage flywheel; the bi-directional DC/AC converter comprises a central processing unit, a rectification/inversion unit and periphery auxiliary circuits; and the central processing unit comprises a microprocessor, a circuit for acquiring the DC bus voltage and a circuit for acquiring rotating speed of the vacuum energy storage flywheel. The energy recovery method is characterized in that when the difference between the DC bus voltage of the variable frequency system and a preset upper limit threshold is monitored by the central processing unit, the rotating speed of the vacuum energy storage flywheel is monitored at the same time, so that whether a DC-AC flow is started or not is determined so as to enable the vacuum energy storage flywheel to absorb or release energy from the DC bus of the variable frequency system.
Description
Technical field
The present invention relates to a kind of energy recycle device for the motor frequency conversion system, particularly a kind of energy recycle device and energy reclaiming method thereof that carries out dynamic equilibrium for the frequency conversion system DC bus-bar voltage.
Background technology
Adopt the motor driving system of transducer drive; when being braked, motor can produce a large amount of braking energies; these energy are admitted to the dc bus of frequency converter; when energy is too much; can cause busbar voltage excessively to raise; be the protection frequency converter, must be by brake unit by energy consumption resistance these unnecessary energy consumption.For reclaiming this part energy, can adopt two way convertor, change the direct current on the bus into the interchange feedback and enter electrical network, also can utilize this part energy that super capacitor is charged by two-way DC/DC converter, in needs again by two-way DC/DC converter with the energy feedback that stores in the super capacitor to dc bus for load.Alternating current is fed back to the method for electrical network, load on electricity consumption when requiring near the inherent feedback of the same transformer scope of feedback device, otherwise the energy of this part feedback will affect to electrical network, and by two-way DC/DC converter and utilize the method for capacitance energy storage that very large drawback is also arranged, because the finite capacity of electric capacity monomer, and energy density is less, often need thousands of electric capacity to go here and there so have the system of actual application value, in parallel, consist of energy-storage units, fairly reach several tons, coherence request to the electric capacity monomer is higher simultaneously, however, the fault of a small amount of electric capacity still can cause the irregular operating of whole system, so these class methods are applied in the less occasion of load mostly, such as vertical lift etc.
Summary of the invention
The objective of the invention is provides a kind of energy recycle device based on the vacuum flywheel energy storage and energy reclaiming method thereof for above-mentioned weak point, change and at present existingly to carry out energy feedback or to carry out the mode of energy feedback by two-way DC/DC converter and super capacitor to dc bus to electrical network, adopt two-way DC/AC converter and vacuum power accumulating flywheel to consist of energy recycle device, when DC bus-bar voltage is higher than predetermined threshold value, drive the disc type alternating current machine of vacuum power accumulating flywheel inside by the energy on the two-way DC/AC converter absorption dc bus, making it carry out energy keeps in, when DC bus-bar voltage is lower than predetermined threshold value, by two-way DC/AC converter the alternating current that the inner disc type alternating current machine of vacuum power accumulating flywheel sends is sent into dc bus again for load after overvoltage adjustment and rectification.
The present invention takes following technical scheme to realize: the energy recycle device based on the vacuum flywheel energy storage comprises two-way DC/AC converter and vacuum power accumulating flywheel, and two-way DC/AC converter is connected with frequency conversion system dc bus and vacuum power accumulating flywheel respectively.
The vacuum power accumulating flywheel comprises flywheel shell, the disc type alternating current machine, the flywheel coasting body, vacuum system, the peripheral auxiliary detection transducer of lubricating system and flywheel, flywheel shell is used for Flywheel coasting body and disc type alternating current machine, flywheel shell is except the support that above-mentioned parts are provided, the sealing function and the mechanical protection effect that also have the vacuum kept, prevent the sputter of damaged parts when flywheel damages, the disc type alternating current machine is used for driving flywheel coasting body High Rotation Speed when makeup energy, realize that electric energy is to the conversion of mechanical energy, when releasing energy, driven generating by the flywheel coasting body, realize that mechanical energy is to the conversion of electric energy; The flywheel coasting body is the very large wheel that is processed by metal of quality, and its rotary inertia is very large, it and the disc type alternating current machine is coaxial is installed in the flywheel shell; Vacuum system comprises vacuum pump and negative pressure switch, and it is used for keeping the vacuum degree in the flywheel shell; Lubricating system comprises grease pump and oil pressure shut-off switch, and it is used for guaranteeing that the bearing of flywheel can be lubricated fully, prolongs bearing useful life; The peripheral auxiliary detection transducer of flywheel links to each other with the input of CPU, the peripheral auxiliary detection transducer of flywheel is for the protection of system, comprise motor coil temperature detection sensor, bearing temperature detecting sensor and shaft vibration detecting sensor, realization is carried out urgency to flywheel and is stopped when temperature or abnormal vibration, to avoid accident; The energy supplement of vacuum power accumulating flywheel and energy discharge to be controlled by two-way DC/AC converter.
Described two-way DC/AC converter comprises CPU and rectification/inversion unit and peripheral auxiliary circuits; CPU comprises microprocessor, DC bus-bar voltage collection circuit and vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit, the input of DC bus-bar voltage collection circuit is connected with the frequency conversion system dc bus, the input of vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit is connected with speed probe on being installed in the vacuum power accumulating flywheel, the output of the output of DC bus-bar voltage collection circuit and vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit links to each other with the input of microprocessor respectively, microprocessor is judged the operating state of frequency conversion system by the DC bus-bar voltage that gathers, according to operating state and the current rotating speed of vacuum power accumulating flywheel of frequency conversion system, output pwm signal (pulse-width signal) is realized the control to the vacuum power accumulating flywheel simultaneously.Described operating state comprises holding state, drive motors acting state and the state that motor is braked.
Described DC bus-bar voltage collection circuit is taken a sample to busbar voltage by sample resistance, by the linear optical coupling isolation, sends into the AD pin of microprocessor after the amplifier conditioning is amplified again.Described linear optical coupling can adopt HCNR200 type optocoupler, and described amplifier can adopt AD620 type amplifier.
Send into the GPIO pin of microprocessor after described vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit is isolated the pulse signal of speed probe output by high speed photo coupling, described high speed photo coupling can adopt 6N137 type optocoupler.
Rectification/inversion unit comprises IGBT switch element (insulated gate bipolar transistor) and silicon rectification device, the IGBT switch element is realized inversion output under the effect of the pwm signal of microprocessor output, silicon rectification device is connected in parallel between IGBT switch element and the frequency conversion system dc bus, is used for the AC rectification that the vacuum power accumulating flywheel is discharged and bursts into the frequency conversion system dc bus.
Peripheral auxiliary circuits is used for system protection, comprises the testing circuits such as overcurrent commonly used, overvoltage, overload, and the protection inversion unit exempts from damage.
The peripheral auxiliary detection transducer of described flywheel is taken a sample to the input and output voltage of rectification/inversion unit respectively by sample resistance, in conjunction with sample resistance the output current of rectification/inversion unit is carried out conversion, sampling by current transformer, signal is sent into the AD pin of microprocessor again through linear light-coupled isolation after the amplifier conditioning is amplified.Described current transformer can adopt commercially available TA23B71 type current transformer, and described linear optical coupling can adopt HCNR200 type optocoupler, and described amplifier can adopt AD620 type amplifier.
Rectification/inversion unit is connected with the disc type alternating current machine of CPU, frequency conversion system dc bus and vacuum power accumulating flywheel inside; CPU is connected with inner each testing circuit of rectification/inversion unit, frequency conversion system dc bus and vacuum power accumulating flywheel, be used for receiving and each parameter signal of feedback vacuum power accumulating flywheel, monitor simultaneously the frequency conversion system dc bus, and the AC power of control rectification/inversion unit output different frequency is used for driving the inner disc type alternating current machine of vacuum power accumulating flywheel or the AC rectification and the feedback bus that produce during with the inner disc type alternating current machine generating of vacuum power accumulating flywheel.
Described vacuum power accumulating flywheel can adopt commercially available vacuum power accumulating flywheel.Smart Energy 25 series of products of Beacon power company for example.
Described rectification/inversion unit can adopt commercially available rectification/inversion unit.ACS800 series of products of ABB AB for example.
A kind of method of carrying out the energy recovery based on the energy recycle device of vacuum flywheel energy storage of using comprises the steps:
1) a kind of use based on the energy recycle device of vacuum flywheel energy storage in use, when CPU monitors the frequency conversion system DC bus-bar voltage and reaches the preset upper limit threshold value, namely this predetermined threshold value approach but and be no more than the threshold value that the frequency conversion system brake unit starts energy consumption resistance, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel does not reach the maximum load rotating speed, then start the DC-AC flow process, utilize energy on the frequency conversion system dc bus to drive the disc type alternating current machine of vacuum power accumulating flywheel inside to the maximum load rotating speed, make vacuum power accumulating flywheel self frequency-changing system dc bus absorb energy;
2) when CPU monitors the frequency conversion system DC bus-bar voltage and is lower than predetermined lower threshold value, namely this predetermined threshold value approach but and be not less than electric network source enters dc bus through the frequency converter rectification magnitude of voltage, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel has surpassed the minimum load rotating speed, then start the AC-DC flow process, disc type alternating current machine to minimum load rotating speed brake vacuum accumulated energy flywheel inside, the vacuum power accumulating flywheel is released energy to the frequency conversion system dc bus, drive loaded work piece;
3) when CPU monitors the frequency conversion system DC bus-bar voltage and reaches preset upper limit threshold value and vacuum power accumulating Speed of Reaction Wheels and meet or exceed the maximum load rotating speed, then enter holding state;
4) in step 3), if busbar voltage continues to rise, will start energy consumption resistance by the brake unit of frequency conversion system, consume excess energy;
5) the frequency conversion system DC bus-bar voltage is lower than predetermined lower threshold value and the vacuum power accumulating Speed of Reaction Wheels is lower than the minimum load rotating speed when CPU monitors, and then enters holding state;
6) in step 5), if busbar voltage continues to descend, then the electrical network direct current after the frequency converter rectification enters frequency conversion system, drives loaded work piece.
Energy recycle device based on the vacuum flywheel energy storage provided by the invention, having overcome prior art utilizes two way convertor with the braking energy feedback electrical network or utilizes two-way DC/DC and super capacitor carries out the deficiency of energy feedback, energy recycle device is used for hybrid vehicle, portal crane, vertical lift, the employing frequency conversion systems such as oil pumper drive and can produce in the equipment of braking energy, energy storage effect by vacuum flywheel, balance DC bus-bar voltage dynamically, the energy that produces when frequency conversion system is braked is temporary, discharges when frequency conversion system drives load motor work.For realizing that more high efficiency braking energy feedback provides guarantee.
Description of drawings
The invention will be further described below with reference to accompanying drawing:
Fig. 1 is the schematic diagram that the present invention is based on the energy recycle device of vacuum flywheel energy storage;
Embodiment
With reference to accompanying drawing 1, the energy recycle device that the present invention is based on the vacuum flywheel energy storage comprises two-way DC/AC converter 7 and vacuum power accumulating flywheel 8, and two-way DC/AC converter 7 is connected with frequency conversion system dc bus 9 and vacuum power accumulating flywheel 8 respectively.
Vacuum power accumulating flywheel 8 comprises flywheel shell, disc type alternating current machine 5, flywheel coasting body 6, vacuum system, the peripheral auxiliary detection transducer of lubricating system and flywheel, flywheel shell is used for Flywheel coasting body 6 and disc type alternating current machine 5, flywheel shell is except the support that above-mentioned parts are provided, the sealing function and the mechanical protection effect that also have the vacuum kept, prevent the sputter of damaged parts when flywheel damages, disc type alternating current machine 5 is used for driving flywheel coasting body High Rotation Speed when makeup energy, realize that electric energy is to the conversion of mechanical energy, when releasing energy, driven generating by flywheel coasting body 6, realize that mechanical energy is to the conversion of electric energy; Flywheel coasting body 6 is the very large wheels that processed by metal of quality, and its rotary inertia is very large, it and disc type alternating current machine 5 coaxial being installed in the flywheel shell; Vacuum system comprises vacuum pump and negative pressure switch, and it is used for keeping the vacuum degree in the flywheel shell; Lubricating system comprises grease pump and oil pressure shut-off switch, and it is used for guaranteeing that the bearing of flywheel can be lubricated fully, prolongs bearing useful life; The peripheral auxiliary detection transducer of flywheel comprises motor coil temperature detection sensor, bearing temperature detecting sensor and shaft vibration detecting sensor for the protection of system, realizes that when temperature or abnormal vibration flywheel being carried out urgency stops, to avoid accident; The energy supplement of vacuum power accumulating flywheel 8 and energy discharge to be controlled by two-way DC/AC converter 7.
Described motor coil temperature detection sensor and bearing temperature detecting sensor adopt commercially available temperature sensor, and described shaft vibration detecting sensor adopts commercially available vibrating sensor.
Described two-way DC/AC converter 7 comprises CPU 3 and rectification/inversion unit 4 and peripheral auxiliary circuits; CPU 3 comprises microprocessor, DC bus-bar voltage collection circuit and vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit, the input of DC bus-bar voltage collection circuit is connected with frequency conversion system dc bus 9, the input of vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit is connected with speed probe on being installed in the vacuum power accumulating flywheel, the output of the output of DC bus-bar voltage collection circuit and vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit links to each other with the input of microprocessor respectively, microprocessor is judged the operating state of frequency conversion system by the DC bus-bar voltage that gathers, according to operating state and the current rotating speed of vacuum power accumulating flywheel of frequency conversion system, output pwm signal (pulse-width signal) is realized the control to the vacuum power accumulating flywheel simultaneously.Described operating state comprises holding state, drive motors acting state and the state that motor is braked.
Described DC bus-bar voltage collection circuit is taken a sample to busbar voltage by sample resistance, by the linear optical coupling isolation, sends into the AD pin of microprocessor after the amplifier conditioning is amplified again.Described linear optical coupling can adopt HCNR200 type optocoupler, and described amplifier can adopt AD620 type amplifier.
Send into the GPIO pin of microprocessor after described vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit is isolated the pulse signal of speed probe output by high speed photo coupling, described high speed photo coupling can adopt 6N137 type optocoupler.
Rectification/inversion unit 4 comprises IGBT switch element (insulated gate bipolar transistor) and silicon rectification device, the IGBT switch element is realized inversion output under the effect of the pwm signal of microprocessor output, silicon rectification device is connected in parallel between IGBT switch element and the frequency conversion system dc bus 9, is used for the AC rectification that the vacuum power accumulating flywheel is discharged and bursts into frequency conversion system dc bus 9.
Peripheral auxiliary circuits is used for system protection, comprises the testing circuits such as overcurrent commonly used, overvoltage, overload, and the protection inversion unit exempts from damage.
The peripheral auxiliary detection transducer of described flywheel is taken a sample to the input and output voltage of rectification/inversion unit 4 respectively by sample resistance, in conjunction with sample resistance the output current of rectification/inversion unit 4 is carried out conversion, sampling by current transformer, signal is sent into the AD pin of microprocessor again through linear light-coupled isolation after the amplifier conditioning is amplified.Described current transformer can adopt commercially available TA23B71 type current transformer, and described linear optical coupling can adopt HCNR200 type optocoupler, and described amplifier can adopt AD620 type amplifier.
Rectification/inversion unit 4 is connected with the disc type alternating current machine 5 of CPU 3, frequency conversion system dc bus 9 and vacuum power accumulating flywheel 8 inside; CPU 3 is connected with rectification/inversion unit 4, frequency conversion system dc bus 9 and vacuum power accumulating flywheel 8 inner each testing circuit, be used for receiving and each parameter signal of feedback vacuum power accumulating flywheel, monitor simultaneously frequency conversion system dc bus 9, and the AC power of control rectification/inversion unit 4 output different frequencies is used for driving the inner disc type alternating current machine of vacuum power accumulating flywheel or the AC rectification and the feedback bus that produce during with the inner disc type alternating current machine generating of vacuum power accumulating flywheel.
Described vacuum power accumulating flywheel 8 can adopt commercially available vacuum power accumulating flywheel.Smart Energy 25 series of products of Beacon power company for example.
Described rectification/inversion unit 4 can adopt commercially available rectification/inversion unit.ACS800 series of products of ABB AB for example.
A kind of method of carrying out the energy recovery based on the energy recycle device of vacuum flywheel energy storage of using comprises the steps:
1) a kind of use based on the energy recycle device of vacuum flywheel energy storage in use, when CPU 3 monitors the frequency conversion system DC bus-bar voltage and reaches the preset upper limit threshold value, namely this predetermined threshold value approach but and be no more than the threshold value that the frequency conversion system brake unit starts energy consumption resistance, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel does not reach the maximum load rotating speed, then start the DC-AC flow process, utilize energy on the frequency conversion system dc bus to drive the disc type alternating current machine of vacuum power accumulating flywheel inside to the maximum load rotating speed, make vacuum power accumulating flywheel self frequency-changing system dc bus absorb energy;
2) when CPU monitors the frequency conversion system DC bus-bar voltage and is lower than predetermined lower threshold value, namely this predetermined threshold value approach but and be not less than electric network source enters dc bus through the frequency converter rectification magnitude of voltage, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel has surpassed the minimum load rotating speed, then start the AC-DC flow process, disc type alternating current machine to minimum load rotating speed brake vacuum accumulated energy flywheel inside, the vacuum power accumulating flywheel is released energy to the frequency conversion system dc bus, drive loaded work piece;
3) when CPU monitors the frequency conversion system DC bus-bar voltage and reaches preset upper limit threshold value and vacuum power accumulating Speed of Reaction Wheels and meet or exceed the maximum load rotating speed, then enter holding state;
4) in step 3), if busbar voltage continues to rise, will start energy consumption resistance by the brake unit of frequency conversion system, consume excess energy;
5) the frequency conversion system DC bus-bar voltage is lower than predetermined lower threshold value and the vacuum power accumulating Speed of Reaction Wheels is lower than the minimum load rotating speed when CPU monitors, and then enters holding state;
6) in step 5), if busbar voltage continues to descend, then the electrical network direct current after the frequency converter rectification enters frequency conversion system, drives loaded work piece.
Embodiment:
With reference to Fig. 1, hoist the unit as example take portal crane, behind the portal crane power supply electrifying, electrical network 380V three-phase alternating current enters the frequency conversion system dc bus through rectification, and the frequency conversion system DC bus-bar voltage is the 540V(peak value), it is 700V that brake unit starts the energy consumption resistance voltage threshold, vacuum power accumulating flywheel minimum load rotating speed 5000rpm, maximum load rotating speed 8000rpm, two-way DC/AC converter bus voltage upper limit monitoring threshold is 680V, the lower limit monitoring threshold is 600V.
When the frequency conversion system dc bus has electricity (mains supply), energy recycle device begins standby, and when crane was not started working, busbar voltage was 540V, and the vacuum power accumulating Speed of Reaction Wheels is zero, and energy recycle device still is in holding state; When crane is started working, when suspension hook begins to descend, crane frequency converter 1 is braked lifting motor 2 for the control decrease speed, DC bus-bar voltage can rise rapidly, and reach very soon 680V, CPU 3 monitors the variation of busbar voltage, start the DC-AC flow process, absorb energy by rectification/inversion unit 4 from bus, and drive disc type alternating current machine 5 and begin rotation, 6 rotations of disc type alternating current machine 5 flywheel driven coasting bodies are if the vacuum power accumulating Speed of Reaction Wheels reaches 8000rpm, device is finished and is filled energy, enters holding state; When crane hook begins to rise, crane frequency converter 1 drives lifting electric motor 2 rotations, and DC bus-bar voltage can descend rapidly, and is lower than very soon 600V, CPU 3 monitors the variation of busbar voltage, start the AC-DC flow process, brake by 4 pairs of disc type alternating current machines 5 of rectification/inversion unit, 5 generatings of flywheel coasting body 6 band moving plate type alternating current machines, release energy to bus, if the vacuum power accumulating Speed of Reaction Wheels drops to 5000rpm, device is finished energy and is discharged, and enters holding state; Can busbar voltage just drop to below the 600V if the vacuum power accumulating flywheel is finished not fill, or the vacuum power accumulating flywheel do not finish energy and discharge busbar voltage and just be elevated to more than the 680V, device all can automatic stand-by, wait for next time fill can or energy discharge.
Claims (5)
1. energy recycle device based on the vacuum flywheel energy storage, it is characterized in that: comprise two-way DC/AC converter and vacuum power accumulating flywheel, two-way DC/AC converter is connected with frequency conversion system dc bus and vacuum power accumulating flywheel respectively;
Described two-way DC/AC converter comprises CPU and rectification/inversion unit and peripheral auxiliary circuits; CPU comprises microprocessor, DC bus-bar voltage collection circuit and vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit, the input of DC bus-bar voltage collection circuit is connected with the frequency conversion system dc bus, the input of vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit is connected with speed probe on being installed in the vacuum power accumulating flywheel, the output of the output of DC bus-bar voltage collection circuit and vacuum power accumulating Speed of Reaction Wheels Acquisition Circuit links to each other with the input of microprocessor respectively, microprocessor is judged the operating state of frequency conversion system by the DC bus-bar voltage that gathers, according to operating state and the current rotating speed of vacuum power accumulating flywheel of frequency conversion system, output pwm signal is realized the control to the vacuum power accumulating flywheel simultaneously;
Rectification/inversion unit is connected with the disc type alternating current machine of CPU, frequency conversion system dc bus and vacuum power accumulating flywheel inside; CPU is connected with inner each testing circuit of rectification/inversion unit, frequency conversion system dc bus and vacuum power accumulating flywheel, be used for receiving and each parameter signal of feedback vacuum power accumulating flywheel, monitor simultaneously the frequency conversion system dc bus, and the AC power of control rectification/inversion unit output different frequency is used for driving the inner disc type alternating current machine of vacuum power accumulating flywheel or the AC rectification and the feedback bus that produce during with the inner disc type alternating current machine generating of vacuum power accumulating flywheel.
2. the energy recycle device based on the vacuum flywheel energy storage according to claim 1, it is characterized in that: rectification/inversion unit comprises IGBT switch element and silicon rectification device, the IGBT switch element is realized inversion output under the effect of the pwm signal of microprocessor output, silicon rectification device is connected in parallel between IGBT switch element and the frequency conversion system dc bus, is used for the AC rectification that the vacuum power accumulating flywheel is discharged and bursts into the frequency conversion system dc bus.
3. the energy recycle device based on the vacuum flywheel energy storage according to claim 1, it is characterized in that: described vacuum power accumulating flywheel comprises the peripheral auxiliary detection transducer of flywheel shell, disc type alternating current machine, flywheel coasting body, vacuum system, lubricating system and flywheel, and flywheel coasting body and disc type alternating current machine are coaxial to be installed in the flywheel shell; Vacuum system comprises vacuum pump and negative pressure switch; Lubricating system comprises grease pump and oil pressure shut-off switch; The peripheral auxiliary detection transducer of flywheel links to each other with the input of CPU, and the peripheral auxiliary detection transducer of flywheel comprises motor coil temperature detection sensor, bearing temperature detecting sensor and shaft vibration detecting sensor; The energy supplement of vacuum power accumulating flywheel and energy discharge to be controlled by two-way DC/AC converter.
4. the energy recycle device based on the vacuum flywheel energy storage according to claim 1 is characterized in that: the operating state of described frequency conversion system comprises holding state, drive motors acting state and the state that motor is braked.
5. a right to use requires 1 described energy recycle device based on the vacuum flywheel energy storage to carry out the method that energy reclaims, and it is characterized in that, comprises the steps:
1) a kind of use based on the energy recycle device of vacuum flywheel energy storage in use, when CPU monitors the frequency conversion system DC bus-bar voltage and reaches the preset upper limit threshold value, namely this predetermined threshold value approach but and be no more than the threshold value that the frequency conversion system brake unit starts energy consumption resistance, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel does not reach the maximum load rotating speed, then start the DC-AC flow process, utilize energy on the frequency conversion system dc bus to drive the disc type alternating current machine of vacuum power accumulating flywheel inside to the maximum load rotating speed, make vacuum power accumulating flywheel self frequency-changing system dc bus absorb energy;
2) when CPU monitors the frequency conversion system DC bus-bar voltage and is lower than predetermined lower threshold value, namely this predetermined threshold value approach but and be not less than electric network source enters dc bus through the frequency converter rectification magnitude of voltage, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel has surpassed the minimum load rotating speed, then start the AC-DC flow process, disc type alternating current machine to minimum load rotating speed brake vacuum accumulated energy flywheel inside, the vacuum power accumulating flywheel is released energy to the frequency conversion system dc bus, drive loaded work piece;
3) when CPU monitors the frequency conversion system DC bus-bar voltage and reaches preset upper limit threshold value and vacuum power accumulating Speed of Reaction Wheels and meet or exceed the maximum load rotating speed, then enter holding state;
4) in step 3), if busbar voltage continues to rise, will start energy consumption resistance by the brake unit of frequency conversion system, consume excess energy;
5) the frequency conversion system DC bus-bar voltage is lower than predetermined lower threshold value and the vacuum power accumulating Speed of Reaction Wheels is lower than the minimum load rotating speed when CPU monitors, and then enters holding state;
6) in step 5), if busbar voltage continues to descend, then the electrical network direct current after the frequency converter rectification enters frequency conversion system, drives loaded work piece.
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| CN105082610A (en) * | 2015-09-07 | 2015-11-25 | 华中科技大学 | Power device used for reducing installed power of hydraulic machine and application thereof |
| CN105340152A (en) * | 2013-06-24 | 2016-02-17 | 富饶科技有限公司德国分公司 | Energy storage module comprising a dc link |
| CN106099994A (en) * | 2016-07-04 | 2016-11-09 | 曾宪瑞 | A kind of control method of the stable electric generation system being adapted to remote districts isolated power network |
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