CN203014391U - Energy recovery device based on vacuum flywheel energy storage - Google Patents
Energy recovery device based on vacuum flywheel energy storage Download PDFInfo
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- CN203014391U CN203014391U CN 201220665899 CN201220665899U CN203014391U CN 203014391 U CN203014391 U CN 203014391U CN 201220665899 CN201220665899 CN 201220665899 CN 201220665899 U CN201220665899 U CN 201220665899U CN 203014391 U CN203014391 U CN 203014391U
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Abstract
The utility model relates to an energy recovery device used for a motor frequency conversion system and especially relates to the energy recovery device based on vacuum flywheel energy storage. The energy recovery device comprises a bidirectional DC/AC converter and a vacuum energy storage flywheel, wherein the bidirectional DC/AC converter is respectively connected with a frequency conversion system direct current bus and the vacuum energy storage flywheel, and the bidirectional DC/AC converter comprises a central processing unit, a rectification/inversion unit and a peripheral auxiliary circuit. The energy recovery device settles disadvantages of realizing braking energy feedback by utilizing a bidirectional current transformer or carrying out energy feedback by utilizing a bidirectional DC/DC and a super capacitor, dynamically balances voltage of the current bus through an energy storage effect of the vacuum flywheel, can realize temporary storage of energy generated by a frequency conversion system and releases the energy when the frequency conversion system drives a load motor to work.
Description
Technical field
The utility model relates to a kind of energy recycle device for the motor frequency conversion system, particularly a kind of energy recycle device 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 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 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, therefore these class methods are applied in the less occasion of load mostly, such as vertical lift etc.
The utility model content
the purpose of this utility model is to provide a kind of energy recycle device based on the vacuum flywheel energy storage for above-mentioned weak point, change is at present existing to be carried out energy feedback or carries out the mode of energy feedback to dc bus by two-way DC/DC converter and super capacitor to electrical network, adopt two-way DC/AC converter and vacuum power accumulating flywheel to consist of energy recycle device, in DC bus-bar voltage during higher than predetermined threshold value, drive the disc type alternating current machine of vacuum power accumulating flywheel inside by the energy on two-way DC/AC converter absorption dc bus, making it carry out energy keeps in, when DC bus-bar voltage during 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 utility model 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 arrives the conversion of mechanical energy, driven generating by the flywheel coasting body when releasing energy, realize that mechanical energy arrives 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 arranged in flywheel shell, vacuum system comprises vacuum pump and negative pressure switch, and it is used for keeping the vacuum degree in 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, extends bearing useful life, the peripheral auxiliary detection transducer of flywheel is connected 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 arranged on 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 is connected with the input of microprocessor respectively, microprocessor judges the operating state of frequency conversion system by the DC bus-bar voltage that gathers, while is 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.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, isolates by linear optical coupling, then send into the AD pin of microprocessor after the amplifier conditioning is amplified.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 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 through linear light-coupled isolation, then sends into the AD pin of microprocessor 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.
The disc type alternating current machine of rectification/inversion unit and CPU, frequency conversion system dc bus and vacuum power accumulating flywheel inside is connected; 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 controlling 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, start the DC-AC flow process, utilize the 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 lower than predetermined lower threshold value, namely this predetermined threshold value approach but and be not less than electric network source and enter the magnitude of voltage of dc bus through the frequency converter rectification, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel has surpassed the minimum load rotating speed, 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, 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) when CPU monitor the frequency conversion system DC bus-bar voltage lower than predetermined lower threshold value and vacuum power accumulating Speed of Reaction Wheels lower than the minimum load rotating speed, enter holding state;
6) in step 5), if busbar voltage continues to descend, the electrical network direct current after the frequency converter rectification enters frequency conversion system, drives loaded work piece.
the energy recycle device based on the vacuum flywheel energy storage that the utility model provides, 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, when driving load motor work, frequency conversion system discharges.For realizing that more high efficiency braking energy feedback provides guarantee.
Description of drawings
The utility model is described in further detail below with reference to accompanying drawing:
Fig. 1 is that the utility model is based on the schematic diagram of the energy recycle device of vacuum flywheel energy storage;
Embodiment
With reference to accompanying drawing 1, the utility model comprises two-way DC/AC converter 7 and vacuum power accumulating flywheel 8 based on the energy recycle device of vacuum flywheel energy storage, 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 arrives the conversion of mechanical energy, driven generating by flywheel coasting body 6 when releasing energy, realize that mechanical energy arrives 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 is coaxial is arranged in flywheel shell, vacuum system comprises vacuum pump and negative pressure switch, and it is used for keeping the vacuum degree in 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, extends 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 arranged on 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 is connected with the input of microprocessor respectively, microprocessor judges the operating state of frequency conversion system by the DC bus-bar voltage that gathers, while is 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.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, isolates by linear optical coupling, then send into the AD pin of microprocessor after the amplifier conditioning is amplified.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 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 through linear light-coupled isolation, then sends into the AD pin of microprocessor 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.
The disc type alternating current machine 5 of rectification/inversion unit 4 and CPU 3, frequency conversion system dc bus 9 and vacuum power accumulating flywheel 8 inside is connected; CPU 3 is connected with rectification/inversion unit 4, frequency conversion system dc bus 9 and inner each testing circuit of vacuum power accumulating flywheel 8, 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 controlling 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, start the DC-AC flow process, utilize the 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 lower than predetermined lower threshold value, namely this predetermined threshold value approach but and be not less than electric network source and enter the magnitude of voltage of dc bus through the frequency converter rectification, monitor simultaneously the vacuum power accumulating Speed of Reaction Wheels, if the vacuum power accumulating flywheel has surpassed the minimum load rotating speed, 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, 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) when CPU monitor the frequency conversion system DC bus-bar voltage lower than predetermined lower threshold value and vacuum power accumulating Speed of Reaction Wheels lower than the minimum load rotating speed, enter holding state;
6) in step 5), if busbar voltage continues to descend, 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, after 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 controlling 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, 5 flywheel driven coasting bodies 6 rotations of disc type alternating current machine are if the vacuum power accumulating Speed of Reaction Wheels reaches 8000rpm, device is completed 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 very fast lower than 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, 6 band moving plate type alternating current machine 5 generatings of flywheel coasting body, release energy to bus, if the vacuum power accumulating Speed of Reaction Wheels drops to 5000rpm, device is completed energy and is discharged, and enters holding state; Can busbar voltage just drop to below 600V if the vacuum power accumulating flywheel is completed not fill, or the vacuum power accumulating flywheel do not complete energy and discharge more than busbar voltage just is elevated to 680V, device all can automatic stand-by, wait for next time fill can or energy discharge.
Claims (4)
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 arranged on 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 is connected with the input of microprocessor respectively, microprocessor judges the operating state of frequency conversion system by the DC bus-bar voltage that gathers, while is 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,
The disc type alternating current machine of rectification/inversion unit and CPU, frequency conversion system dc bus and vacuum power accumulating flywheel inside is connected; 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 controlling 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 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 arranged in 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 is connected 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220665899 CN203014391U (en) | 2012-12-06 | 2012-12-06 | Energy recovery device based on vacuum flywheel energy storage |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201220665899 CN203014391U (en) | 2012-12-06 | 2012-12-06 | Energy recovery device based on vacuum flywheel energy storage |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957159A (en) * | 2012-12-06 | 2013-03-06 | 江苏交科能源科技发展有限公司 | Energy recovery device based on vacuum flywheel energy storage and energy recovery method thereof |
| CN104196079A (en) * | 2014-07-25 | 2014-12-10 | 昆山三一数字科技有限公司 | Hydraulic excavator hybrid power system and hydraulic excavator thereof |
| CN106998154A (en) * | 2017-04-07 | 2017-08-01 | 北京群菱能源科技有限公司 | A kind of DC/AC converters |
| CN110504673A (en) * | 2019-08-16 | 2019-11-26 | 济南二机床集团有限公司 | A kind of active Energy Management System |
| CN113098039A (en) * | 2021-03-04 | 2021-07-09 | 清华大学 | Kinetic energy recovery system and method based on flywheel energy storage variable-speed pumped storage unit |
-
2012
- 2012-12-06 CN CN 201220665899 patent/CN203014391U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957159A (en) * | 2012-12-06 | 2013-03-06 | 江苏交科能源科技发展有限公司 | Energy recovery device based on vacuum flywheel energy storage and energy recovery method thereof |
| CN102957159B (en) * | 2012-12-06 | 2014-12-24 | 江苏交科能源科技发展有限公司 | Energy recovery device based on vacuum flywheel energy storage and energy recovery method thereof |
| CN104196079A (en) * | 2014-07-25 | 2014-12-10 | 昆山三一数字科技有限公司 | Hydraulic excavator hybrid power system and hydraulic excavator thereof |
| CN106998154A (en) * | 2017-04-07 | 2017-08-01 | 北京群菱能源科技有限公司 | A kind of DC/AC converters |
| CN110504673A (en) * | 2019-08-16 | 2019-11-26 | 济南二机床集团有限公司 | A kind of active Energy Management System |
| CN113098039A (en) * | 2021-03-04 | 2021-07-09 | 清华大学 | Kinetic energy recovery system and method based on flywheel energy storage variable-speed pumped storage unit |
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