CN102013754A - Energy-saving elevator power distribution system - Google Patents
Energy-saving elevator power distribution system Download PDFInfo
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- CN102013754A CN102013754A CN 201010573041 CN201010573041A CN102013754A CN 102013754 A CN102013754 A CN 102013754A CN 201010573041 CN201010573041 CN 201010573041 CN 201010573041 A CN201010573041 A CN 201010573041A CN 102013754 A CN102013754 A CN 102013754A
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- 239000003990 capacitor Substances 0.000 claims abstract description 28
- 238000004364 calculation method Methods 0.000 claims abstract description 20
- 238000004891 communication Methods 0.000 claims abstract description 14
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 238000005070 sampling Methods 0.000 claims abstract description 11
- 238000004804 winding Methods 0.000 claims abstract description 4
- 238000009825 accumulation Methods 0.000 claims description 34
- 238000004146 energy storage Methods 0.000 abstract description 18
- 230000002457 bidirectional effect Effects 0.000 abstract 5
- 238000000034 method Methods 0.000 description 11
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- 238000005381 potential energy Methods 0.000 description 6
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- 238000005516 engineering process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
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- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
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- 239000007772 electrode material Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention discloses an energy-saving elevator power distribution system. A signal sampling unit in a flywheel energy storage device of the power distribution system is used for acquiring state parameters of an electrolytic capacitor, a bidirectional energy converter, a flywheel, a flywheel motor, the power grid and an inverter in an elevator system, and the output end of the signal sampling unit is connected with the input end of an analog to digital (A/D) converter; the output end of the A/D converter is connected with the input end of a calculation control unit; the communication port of the calculation control unit is connected with a communication unit, and the control signal output end of the calculation control unit is connected with the input end of an isolation driving unit; the output end of the isolation driving unit is connected with the control end of the bidirectional energy converter; the positive end of the electrolytic capacitor is respectively connected with the positive end of the output port of a three-phase rectifier and the positive end of the direct current (DC) port of the bidirectional energy converter, and the negative end of the electrolytic capacitor is respectively connected with the negative end of the output port of the three-phase rectifier and the negative end of the DC port of the bidirectional energy converter; and a rotor of the flywheel motor is coaxially connected with the flywheel, and a three-phase stator winding of the flywheel motor is electrically connected with the alternative current (AC) end of the bidirectional energy converter.
Description
Technical field
The present invention relates to a kind of energy-saving elevator distribution system, particularly disclose a kind of technical scheme of using energy accumulation device for fly wheel as accessory power supply, energy recovery unit and the stand-by power supply of elevator, belong to the energy and appliance field.
Background technology
Along with the propelling of social city's process, skyscraper continues to bring out.As the vertical transportation instrument of high building, the demand of elevator is also growing.People have promoted the progress of elevator technology to the continuous pursuit of elevator safety, high efficiency, comfortableness.When elevator was extensively popularized and developed, the power consumption of elevator also increased with surprising rapidity.Along with highlighting gradually of energy problem, the power-saving technology of elevator has become one of topic of people's care.
As everyone knows, elevator in the course of the work not only potential energy change, and mechanical kinetic energy also changes.Its course of work be not a folk prescription to catabiotic process, but existing energy absorption, also the reciprocal process of energy feedback arranged.
Have maximum mechanical kinetic energy after elevator startup operation reaches highest running speed, elevator will progressively slow down till the elevator stop motion before arriving destination, and this process is the process that elevator discharges mechanical kinetic energy.
Elevator still is a potential energy load.In order to reduce to drag load, reduce the power of elevator motor, the car of elevator all is furnished with the counterbalancing piece.Weight when the weight of counterbalancing piece generally equals car load-carrying 50% nominal load.When existing between the two when of poor quality, elevator lifting will cause the change of mechanical potential energy.When wherein quality parts heavily were up, elevator motor absorbed energy from electrical network, drags elevator the mechanical potential energy of elevator is increased; When the parts that quality weighs were descending, the mechanical potential energy of elevator reduced.
The mechanical energy that discharges in the running process of elevator (comprising mechanical kinetic energy and mechanical potential energy) is transformed into electric energy by elevator motor and frequency converter and stores in the electric capacity of frequency converter DC link, and capacitance voltage is risen gradually.Because the finite capacity of this electric capacity, the electric energy as in the untimely release electric capacity will produce the overvoltage fault, and frequency converter is quit work.The method that discharges at present unnecessary electric weight in the electric capacity is energy consumption is fallen or to be adopted feedback unit that energy is fed back to electrical network by applied power resistance.The method of applied power resistance is simple and practical, be easy to implement, but this mode not only makes energy waste, and can cause the operating ambient temperature of elevator to raise, and must additionally increase cooling device, has improved cost.Adopt the scheme of feedback unit energy recuperation can be utilized again, be a kind of method for saving energy on the principle, but need the optional equipment elevator energy feedback device, system complex, and only have the effect that elevator energy reclaims, function singleness.
On the other hand,, prevent to be parked between the floor, generally all need to install stand-by power supply in the elevator because of the elevator that electric network fault causes being loaded with the passenger in order to guarantee the firm power supply of elevator.At present, normally used stand-by power supply is a chargeable storage in the elevator, as lead acid accumulator, nickel cadmium cell, nickel-hydrogen accumulator etc.This scheme exists many-sided deficiency, mainly comprise: (1) is shorter useful life, need periodic replacement: since chargeable storage in the course of the work electrode active material chemical change can take place, cause the expansion and the contraction of electrode structure, can cause the accumulator property decay, its life-span generally is no more than 5 years.(2) energy recuperation poor performance: the general power characteristic of storage battery is relatively poor, can not high-powerly charge; And needing the energy-storage units of (tens seconds to a few minutes) high-power charging in short-term during lift energy feedback, storage battery can not satisfy this requirement.(3) to the coherence request height of storage battery: because the capacity of cell batteries and the requirement that electric pressure can not satisfy elevator need be formed batteries with series-parallel form with a plurality of storage batterys and use.And the inconsistency of accumulator property can be quickened the capacity attenuation of batteries, has a strong impact on the useful life of batteries.(4) exist problem of environmental pollution: the metal material after storage battery uses is difficult for handling, and can cause heavy metal pollution to environment.As can be seen, because the restriction of self performance, chargeable storage can only be as the stand-by power supply of elevator, and the energy-storage units can not serve as lift energy feedback simultaneously the time.As realizing the energy recuperation of elevator, design in addition.
Flywheel energy storage is a kind of novel energy storage device, is made up of incorporate dynamoelectric machine, flywheel and bi-directional power converter etc.This device utilizes the flywheel of high speed rotating with the form storage of energy with mechanical kinetic energy, carries out electric energy and mechanical transformation of energy by dynamoelectric machine, is realized the function that discharges and recharges by bi-directional power converter.Modern energy accumulation device for fly wheel generally adopts high strength, low-density fibrous composite to make flywheel, and bearing is used magnetic levitation technology, so flywheel can reach very high rotating speed and avoid frictional dissipation, and complete machine can be accomplished high-energy-density and high efficiency.Because energy accumulation device for fly wheel discharges and recharges by motor with the form storage of electrical energy of mechanical energy, not only has good power characteristic and very high energy conversion efficiency, and does not does not discharge and recharge the restriction of number of times, long service life.In addition, energy accumulation device for fly wheel can high-powerly in short-term discharge and recharge, in the time of can satisfying lift energy feedback fully to the power requirement of energy-storage units.Energy accumulation device for fly wheel is applied to elevator device, can have avoided the waste of energy, reach purpose energy-conservation and raising elevator reliability simultaneously as accessory power supply, stand-by power supply and energy recovery unit.Energy accumulation device for fly wheel energy-storage property in the course of the work can not change, not contain harmful chemical substance, to advantages such as the influence of environment are little it be had highly application value with discharging and recharging number of times in addition.
Summary of the invention
The object of the present invention is to provide a kind of energy-saving elevator distribution system, it uses accessory power supply, energy recovery unit and the stand-by power supply of energy accumulation device for fly wheel as elevator, when absorbing energy, elevator releases energy, absorb energy during lift energy feedback, the energy recuperation of elevator feedback is utilized again, reach energy-conservation and alleviate the purpose of network load; When the electrical network catastrophic failure, serve as stand-by power supply, guarantee the safe and reliable of elevator.
For achieving the above object, the technical solution used in the present invention is: its energy-saving elevator distribution system comprises three-phase rectifier, electrochemical capacitor and energy accumulation device for fly wheel, described energy accumulation device for fly wheel comprises flywheel, fly-wheel motor, bi-directional power converter and energy controller, described energy controller comprises signal sampling unit, A/D converter, calculation control unit, isolation drive unit and communication unit, and described signal sampling unit is used for gathering the state parameter of the inverter of electrochemical capacitor, bi-directional power converter, flywheel, fly-wheel motor, electrical network, elevator device; The output of signal sampling unit is connected with the input of A/D converter, the output of A/D converter is connected with the input of calculation control unit, the communication port of calculation control unit is connected with communication unit, the control signal output ends of calculation control unit is connected with the input of isolation drive unit, and the output of isolation drive unit is connected with the control end of bi-directional power converter; The anode of described electrochemical capacitor is connected with the anode of three-phase rectifier output port, the anode of bi-directional power converter DC port respectively, and the negative terminal of electrochemical capacitor is connected with the negative terminal of three-phase rectifier output port, the negative terminal of bi-directional power converter DC port respectively; The rotor of fly-wheel motor is connected with flywheel is coaxial, and the threephase stator winding of fly-wheel motor is electrically connected with the end that exchanges of bi-directional power converter.
The used fly-wheel motor of the present invention can adopt three phase alternating current motor, can be asynchronous machine, also can be magneto (comprising brushless AC motor and brshless DC motor).Mechanical loss when rotating in order to reduce motor and flywheel to greatest extent, the efficient of raising energy accumulation device for fly wheel, the bearing of fly-wheel motor adopts magnetic suspension bearing, and with motor and flywheel integrated design, places a vaccum case jointly.Fly-wheel motor is operated in electric motor state during the energy accumulation device for fly wheel charging, and fly-wheel motor is operated in the generator state during discharge, and the course of work is controlled by bi-directional power converter.Bi-directional power converter is selected corresponding two-way DC/AC converter according to motor type.The power and the electric pressure of fly-wheel motor and bi-directional power converter are decided on actual conditions.
The present invention compared with prior art it is advantageous that:
(1) because energy accumulation device for fly wheel with the form stored energy of mechanical kinetic energy, discharges and recharges by motor, not only has good power characteristic and high-energy conversion efficiency, and do not have and discharge and recharge the restriction of number of times, so can reach efficient, long-life purpose.
Energy recovery unit, accessory power supply and stand-by power supply when (2) energy accumulation device for fly wheel can serve as elevator machine simultaneously and can discharge have been realized three kinds of functions with a covering device, and system configuration is become simply, have reached intensive effect;
When (3) elevator motor drives operation, especially the startup stage need absorb bigger power, energy accumulation device for fly wheel assists electrical network to drive elevator motor as accessory power supply, has alleviated when elevator starts the influence to electrical network;
(4) energy feedback during the elevator motor running under braking, energy accumulation device for fly wheel stores as the energy that energy recovery unit absorbs feedback fully.Reach purpose of energy saving, no longer needed traditional energy bleed-off circuit in the elevator device.
(5) energy accumulation device for fly wheel is with mechanical kinetic energy form stored energy, and stored energy capacitance can be with not discharging and recharging increasing and reducing of number of times, and the energy of storage measures easily, is convenient to the design of control system;
(6) energy accumulation device for fly wheel does not contain hazardous substance, environmentally safe.
Description of drawings
Fig. 1 is the structural representation that the present invention is applied to elevator device;
Fig. 2 is the structured flowchart of energy controller of the present invention.
Fig. 3 is the control flow chart of energy controller of the present invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.
As shown in Figure 1, the energy-saving elevator distribution of the present invention system comprises three-phase rectifier 1, electrochemical capacitor 2 and energy accumulation device for fly wheel 9.The elevator device of having used the energy-saving elevator distribution of the present invention system also comprises inverter 3, elevator motor 4 and electric life controller 10.
In energy-saving elevator distribution system, energy accumulation device for fly wheel 9 comprises flywheel 7, fly-wheel motor 6, bi-directional power converter 5 and energy controller 8.The rotor of fly-wheel motor 6 and 7 coaxial connections of flywheel, the threephase stator winding of fly-wheel motor 6 is electrically connected with the end that exchanges of bi-directional power converter 5, and the dc terminal of bi-directional power converter 5 is served as the external energy interface of energy accumulation device for fly wheel 9.The input of three-phase rectifier 1 is connected with electrical network, the anode of electrochemical capacitor 2 is connected with the anode of three-phase rectifier 1 output port, the anode of bi-directional power converter 5 DC port, the anode of inverter 3 DC port respectively, and the negative terminal of electrochemical capacitor 2 is connected with the negative terminal of three-phase rectifier 1 output port, the negative terminal of bi-directional power converter 5 DC port, the negative terminal of inverter 3 DC port respectively; The interchange end of inverter 3 is connected with elevator motor 4, by electric life controller 10 control inverters 3, thereby drives elevator motor 4 operations.The three-phase alternating current of electrical network is through three-phase rectifier 1 rectification, and electrochemical capacitor 2 is supplied with in output, is undertaken exporting after the filtering by electrochemical capacitor 2, for elevator device provides the direct current input.Electrochemical capacitor 2 and bi-directional power converter 5, inverter 3 form parallel-connection structure, and the latter two carry out energy exchange with electrochemical capacitor 2 respectively, make the electric energy two-way flow.5 operations of energy controller 8 control bi-directional power converter, and send flywheel 7 energy storage values and electric network state to electric life controller 10; Electric life controller 10 receives flywheel 7 energy storage values, electric network state information and user instruction, 4 operations of control elevator motor.
As shown in Figure 2, energy controller 8 of the present invention comprises signal sampling unit 21, A/D converter 22, calculation control unit 23, calculation control unit 24 and communication unit 25; Wherein the state parameter of the 21 pairs of systems in signal sampling unit is sampled, specifically comprise: adopt AC voltage sensor that line voltage is sampled, adopt the direct voltage transducer that electrochemical capacitor 2 voltages are sampled, adopt current sensor respectively the input and output electric current of bi-directional power converter 5 dc terminal, the input and output electric current of inverter 3 dc terminal, the threephase stator electric current of fly-wheel motor 6 to be sampled, adopt velocity transducer that flywheel 7 rotating speeds are sampled; The output of signal sampling unit 21 is connected with the input of A/D converter 22, gives A/D converter 22 with output voltage signal; The output of A/D converter 22 is connected with the input of calculation control unit 23, gives calculation control unit 23 with the digital signal of conversion; Calculation control unit 23 can adopt digital signal processor DSP, single-chip microcomputer, embedded system etc., will export after the computing of gained digital signal.The communication port of calculation control unit 23 is connected with communication unit 25, the storage power value and the electric network state information of output flywheel 7, and the rotary speed information of reception elevator motor 4; Communication unit 25 is set up data communication channel between calculation control unit 23 and electric life controller 10, concrete communication form is selected according to the formation of elevator device, includes but not limited to CAN, I
2C, SCI etc. give electric life controller 10 with the energy storage value and the electric network state information of flywheel 7; The control signal output ends of calculation control unit 23 is connected with the input of isolation drive unit 24, gives isolation drive unit 24 with the control signal of bi-directional power converter 5; Isolation drive unit 24 adopts opto-coupler chip and chip for driving, and the control signal of calculation control unit 23 outputs is carried out electrical isolation and power amplification; The output of isolation drive unit 24 is connected with the control end of bi-directional power converter 5,5 work of output drive signal control bi-directional power converter.
The control flow chart of energy controller 8 of the present invention as shown in Figure 3, energy controller 8 is judged the running status of elevator motor 4 by the input and output electric current of inverter 3 dc terminal.According to the current value that flows to inverter 3 is positive and negative or zero, the running status of elevator motor 4 is divided into three kinds: driving condition, on-position and stopped status.Usually the power factor of elevator motor 4 is not equal to 1, therefore when driving condition moves, be not in 100% time all in absorbed power, promptly be not that electric current all flows to inverter 3 from electrochemical capacitor 2 in 100% time; When on-position is moved, neither all flow to electrochemical capacitor 2 by electric current in 100% time equally from inverter 3; So can not judge the running status of elevator motor 4 with the instantaneous value of inverter 3 dc terminal input and output electric currents.The mean value of interior inverter 3 dc terminal input and output electric currents of electric cycle is judged the running status of elevator motor 4 when adopting elevator motor 4 operations here.Energy controller 8 is determined the electric cycle of elevator motor 4 by elevator motor 4 tach signals that receive from electric life controller 10.
Elevator motor 4 driving conditions when operation, especially the startup stage, elevator motor 4 is drawn bigger power by inverter 3, this moment, energy accumulation device for fly wheel 9 to electrochemical capacitor 2 power supplies, assisted electrical network to drive elevator motor 4 work jointly by bi-directional power converter 5.Energy accumulation device for fly wheel 9 and electrical network form the parallel operation structure, during the electrical network normal power supply, three-phase rectifier 1 output is stable, just can control the size of its output current by the dc terminal output voltage of regulating bi-directional power converter 5, promptly can control the discharge power of energy accumulation device for fly wheel 9.Energy controller 8 calculates the discharge power of energy accumulation device for fly wheel 9 by bi-directional power converter 5 dc terminal output currents, and the energy storage value by flywheel 7 revolution speed calculating flywheels 7, after computing, export control signal, the output voltage of control bi-directional power converter 5, the discharge power of final control energy accumulation device for fly wheel 9 makes the energy storage value of flywheel 7 remain on a suitable scope.
Serve as emergency power supply for guaranteeing to have in the flywheel 7 enough energy when the electric network fault, set a reserved energy value according to real system.Mains supply just often, the energy storage value of flywheel 7 is higher than this set point all the time.In the discharge process,, reduce the discharge power of energy accumulation device for fly wheel 9 when energy storage during near this set point; When energy storage near flywheel 7 energy storage in limited time, improve the discharge power of energy accumulation device for fly wheel 9.According to the elevator running system choose reasonable flywheel 7 energy storage upper limits and reserved energy value, optimize energy storage---discharge power relation curve, can make system when lift energy feedback, absorb feedback energy fully, no longer need traditional energy bleed-off circuit.
During the operation of elevator motor 4 on-positions, inverter 3 is operated in the regenerative braking state, and the mechanical energy of elevator feeds back to electrochemical capacitor 2, and the voltage of electrochemical capacitor 2 is raise.When the voltage of electrochemical capacitor 2 was higher than set point, energy controller 8 control bi-directional power converter 5 drove fly-wheel motor 6 and quicken rotation, and energy accumulation device for fly wheel 9 absorbs energy from electrochemical capacitor 2 and stores.The driving power of control bi-directional power converter 5 in this process keeps the voltage of electrochemical capacitor 2 to be stabilized in set point, and then charge power is followed elevator motor 4 feedback powers automatically.Because set point is higher than the rated operational voltage of three-phase rectifier 1 output, so can not absorb energy from grid side.
When elevator motor 4 is in stopped status, for reducing system loss, improve system effectiveness, energy controller 8 control bi-directional power converter 5 quit work, and flywheel 7 is in free rotation state; Monitor the energy storage capacity of flywheel 7 simultaneously, when being lower than standby energy set point control energy accumulation device for fly wheel 9 by bi-directional power converter 5 with the rated power charging, from the electrical network makeup energy.
When the electrical network sudden power, it is zero that energy controller 8 detects the line voltage bust, sends power-off signal to electric life controller 10 immediately.Near electric life controller 10 control elevator motors 4 are delivered to elevator safety ground floor is also opened elevator, guarantees the interior passenger's of elevator safety.If during this period of time elevator motor 4 is in the driving condition operation, then energy accumulation device for fly wheel 9 is by the rated operational voltage of bi-directional power converter 5 to electrochemical capacitor 2 output elevators.4 energy requirements of elevator motor are provided by energy accumulation device for fly wheel 9 fully.The parallel operation structure of electrical network and energy accumulation device for fly wheel 9 has guaranteed the uninterrupted power supply of system, for the fail safe of elevator provides guarantee.
Claims (1)
1. energy-saving elevator distribution system, it is characterized in that: comprise three-phase rectifier (1), electrochemical capacitor (2) and energy accumulation device for fly wheel (9), described energy accumulation device for fly wheel (9) comprises flywheel (7), fly-wheel motor (6), bi-directional power converter (5) and energy controller (8), described energy controller (8) comprises signal sampling unit (21), A/D converter (22), calculation control unit (23), isolation drive unit (24) and communication unit (25), described signal sampling unit (21) is used to gather electrochemical capacitor (2), bi-directional power converter (5), flywheel (7), fly-wheel motor (6), electrical network, the state parameter of the inverter in the elevator device; The output of signal sampling unit (21) is connected with the input of A/D converter (22), the output of A/D converter (22) is connected with the input of calculation control unit (23), the communication port of calculation control unit (23) is connected with communication unit (25), the control signal output ends of calculation control unit (23) is connected with the input of isolation drive unit (24), and the output of isolation drive unit (24) is connected with the control end of bi-directional power converter (5); The anode of described electrochemical capacitor (2) is connected with the anode of three-phase rectifier (1) output port, the anode of bi-directional power converter (5) DC port respectively, and the negative terminal of electrochemical capacitor (2) is connected with the negative terminal of three-phase rectifier (1) output port, the negative terminal of bi-directional power converter (5) DC port respectively; The rotor of fly-wheel motor (6) and coaxial connection of flywheel (7), the threephase stator winding of fly-wheel motor (6) is electrically connected with the end that exchanges of bi-directional power converter (5).
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748131A (en) * | 2011-06-03 | 2012-10-24 | 摩尔动力(北京)技术股份有限公司 | Dead state-free piston engine |
| 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 |
| CN102957162A (en) * | 2011-08-18 | 2013-03-06 | 大连互联天下科技发展有限公司 | Control system for active power feedback energy saving device |
| CN107579594A (en) * | 2017-09-28 | 2018-01-12 | 北京泓慧国际能源技术发展有限公司 | A kind of magnetically levitated flywheel energy storage ups system integrates application process |
| IT201600103309A1 (en) * | 2016-10-14 | 2018-04-14 | Gd Spa | Industrial plant |
| CN108054831A (en) * | 2018-01-17 | 2018-05-18 | 江苏新美星包装机械股份有限公司 | A kind of axis turns device powers down protection braking control system and control method |
| CN108134542A (en) * | 2018-01-17 | 2018-06-08 | 江苏新美星包装机械股份有限公司 | A kind of multi-axis machines synchronous control system and control method |
| CN109149755A (en) * | 2018-08-29 | 2019-01-04 | 微控物理储能研究开发（深圳）有限公司 | Using the double transform uninterruptible power systems of the high frequency of flywheel energy storage and control method |
| CN109687395A (en) * | 2018-11-27 | 2019-04-26 | 河海大学 | A kind of magnetic suspension motor power-off protection apparatus and method based on electric energy feedback |
| CN110350647A (en) * | 2019-06-04 | 2019-10-18 | 漳州科华技术有限责任公司 | The anti-drainage method for filling energy of UPS, bleeder and terminal |
| CN110797890A (en) * | 2019-10-29 | 2020-02-14 | 北京泓慧国际能源技术发展有限公司 | Energy storage recovery system of vertical lifting device |
| CN112039099A (en) * | 2020-08-31 | 2020-12-04 | 北京泓慧国际能源技术发展有限公司 | Storage and discharge device and control method thereof |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748131A (en) * | 2011-06-03 | 2012-10-24 | 摩尔动力(北京)技术股份有限公司 | Dead state-free piston engine |
| CN102957162A (en) * | 2011-08-18 | 2013-03-06 | 大连互联天下科技发展有限公司 | Control system for active power feedback energy saving device |
| 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 |
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Application publication date: 20110413 |