KR20190124861A - Energy storage system for elevator using regenerative energy - Google Patents

Abstract

The present invention relates to an energy storage system for an elevator using regenerative energy, which can effectively store and use regenerative energy instantly generated when an elevator stopped. According to the present invention, the energy storage system includes: a DC-DC converter which is connected in parallel between a converter and an inverter where commercial power source providing power source to an elevator is connected; a super capacitor module which is connected in series to the DC-DC converter and has a plurality of super capacitors supporting the commercial power source to provide electric power to the elevator; a regenerative energy sensor which is connected between the commercial power source and the converter and detects whether regenerative energy is generated from an electric motor or not; and a control unit which forwards and stores the regenerative energy to the super capacitor module through the DC-DC converter when the regenerative energy sensor detects generation of regenerative energy.

Description

Energy storage system for elevators using regenerative energy

The present invention relates to an energy storage system (ESS), and more particularly to an elevator energy storage system using the regenerative energy generated during operation of the elevator.

Regenerative energy is being generated in various fields. However, the development of application-specific energy storage devices for efficiently utilizing regenerative energy is insignificant. For example, an elevator can drive an electric motor using a commercial power supply. When braking, the electric motor operates as a generator, so that the regenerative energy generated at this time can be consumed as thermal energy of electric resistance or charged using a lead acid battery. .

However, when the regenerative energy is stored using the lead acid battery, the efficiency of the lead acid battery may not be effectively stored due to the charge and discharge characteristics of the lead acid battery. Such frequent charging and discharging shortens the lead acid battery life, thereby reducing the durability of the lead acid battery.

In addition, in the case of using electrical resistance, regenerative braking is possible, but there is a disadvantage in that electrical energy is released as heat.

Publication No. 2015-0086331 (2015.07.27.)

Accordingly, an object of the present invention is to provide an elevator energy storage system using regenerative energy that can effectively store and use the regenerative energy generated instantaneously during braking of the elevator.

In order to achieve the above object, the present invention is a DC-DC converter connected in parallel between the inverter and the inverter is connected to the commercial power supply for supplying power to the motor of the elevator; A supercapacitor module connected in series with the DC-DC converter, the supercapacitor module including a plurality of supercapacitors that supply power to the elevator by assisting the commercial power source; A regenerative energy detection sensor connected between the commercial power supply and the converter and detecting whether regenerative energy is generated from the electric motor; And a control unit configured to transfer the regenerative energy to the supercapacitor module through the DC-DC converter and to store the regenerative energy when the regenerative energy detection sensor detects the generation of regenerative energy. to provide.

The super capacitor module includes: the plurality of super capacitors; And a super capacitor management system managing the plurality of super capacitors.

The DC-DC converter may control the voltage of the super capacitor to be low when the elevator is lifted and to control the voltage of the super capacitor to be high when the elevator is stopped.

And the plurality of supercapacitors each includes: a power storage element that stores electrochemical energy; A lower terminal plate bonded to a lower portion of the power storage element; An open part formed at one side thereof, and a tubular case made of a metal material in which the power storage element is inserted and embedded through the open part so that the lower terminal plate faces the bottom surface; An upper terminal plate inserted into an opening of the case and electrically connected to the power storage element, the upper terminal plate being fixed to the upper end of the case by beading and curling; And a gasket made of a rubber material interposed between the upper terminal plate and the case.

When the energy storage system according to the present invention detects the generation of regenerative energy generated instantaneously during braking of the elevator, the generated regenerative energy can be effectively stored in the super capacitor module and then used.

1 is a view showing an elevator system including an energy storage system using regenerative energy according to an embodiment of the present invention.
FIG. 2 is a view illustrating an energy storage system using regenerative energy provided with the supercapacitor module of FIG. 1.
3 is a graph showing the results of performing the regenerative operation and the retrograde operation of the elevator system according to an embodiment of the present invention.
4 is a diagram illustrating a super capacitor of the super capacitor module of FIG. 2.
5 is an enlarged view of a portion A of FIG. 4 and illustrates a state in which an upper terminal plate is fixed to an upper portion of a case.
6 is a view illustrating a gas discharge part of FIG. 4.

In the following description, only parts necessary for understanding the embodiments of the present invention will be described, it should be noted that the description of other parts will be omitted in a range that does not distract from the gist of the present invention.

The terms or words used in the specification and claims described below should not be construed as being limited to the ordinary or dictionary meanings, and the inventors are appropriate to the concept of terms in order to explain their invention in the best way. It should be interpreted as meanings and concepts in accordance with the technical spirit of the present invention based on the principle that it can be defined. Therefore, the embodiments described in the present specification and the configuration shown in the drawings are only preferred embodiments of the present invention, and do not represent all of the technical idea of the present invention, and various equivalents may be substituted for them at the time of the present application. It should be understood that there may be variations and variations.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

1 is a view showing an elevator system including an energy storage system using regenerative energy according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an energy storage system including the super capacitor module of FIG. 1.

1 and 2, the elevator system 100 according to the present embodiment includes an elevator 80 and an energy storage system 70.

The elevator 80 may include a power converter 84, an electric motor 87, a passenger car 91, and a balance weight 93. The power change unit 84 includes a converter 83 and an inverter 85. The elevator 80 is supplied with a commercial power source 81 to be driven, and the converter 83 and inverter 85 converting the commercial power source 81 into energy required for driving the electric motor 87 have a commercial power source 81. Is connected in series. Power passing through the inverter 85 is supplied to the electric motor 87 to elevate the boarding car 91. The boarding car 91 may be connected to the counterweight 93 via the pulley 89. The electric motor 87 may elevate the boarding car 91 by rotating the pulley 89.

The energy storage system 70 receives and stores the regenerative energy generated when the elevator 80 is braked. The energy storage system 70 may supply energy stored by assisting the commercial power source 81 as driving energy of the elevator 80.

The energy storage system 70 according to the present embodiment includes a DC-DC converter 71, a super capacitor module 73, a regenerative energy detection sensor 74, and a controller 79. The DC-DC converter 71 is connected in parallel between the inverter 83 and the converter 83 to which a commercial power source 81 for supplying power to the motor 87 of the elevator 80 is connected. The super capacitor module 73 is connected in series to the DC-DC converter 71 and includes a plurality of super capacitors 75 that supply power to the elevator 80 by assisting the commercial power source 81. The regenerative energy detection sensor 74 is connected between the commercial power source 81 and the converter 83, and detects whether or not the regenerative energy is generated from the electric motor 87. When the regenerative energy detection sensor 74 detects the generation of the regenerative energy, the controller 79 transfers the regenerative energy to the super capacitor module 73 through the DC-DC converter 71 and stores the regenerative energy.

At this time, the super capacitor module 73 receives and stores the regenerative energy generated during braking of the elevator 80 through the DC-DC converter 71. By connecting the super capacitor module 73 in a DC-DC series, it is to assist the commercial power supply 81 to supply power.

Since the voltage between the super capacitor module 73 and the commercial power supply 81 should be the same, the DC-DC converter 71 controlling this is connected to the output terminal of the super capacitor module 73. The supercapacitor module 73 is connected in parallel with the commercial power source 81 so that when sudden power fluctuation occurs during operation of the elevator 80, the super capacitor module 73 may play a buffering function to prevent the power fluctuation of the commercial power source 81 from becoming severe. Can be.

The DC-DC converter 71 may control the voltage in inverse proportion to the lifting speed of the elevator 80. For example, the DC-DC converter 71 may control the voltage of the super capacitor module 73 low when the elevator 80 moves up and down. The DC-DC converter 71 may control the voltage of the super capacitor module 73 high when the elevator 80 stops. That is, since the DC-DC converter 71 stops after the elevator 80 starts to lift, the DC-DC converter 71 controls the voltage of the super capacitor module 73 to be sufficiently low so as to absorb the regenerative energy as much as possible. On the contrary, since the DC-DC converter 71 is expected to require more power from the super capacitor module 73 when the elevator 80 is driven later when the elevator 80 is stopped, the super capacitor module 73 Can be controlled sufficiently high.

The super capacitor module 73 includes a plurality of super capacitors 75 and a super capacitor management system (CMS) 77 that manages the plurality of super capacitors 75.

The regenerative energy detection sensor 74 is connected between the power converter 84 for converting and supplying the commercial power supply 81 to the electric motor 87 and the commercial power supply 81 to generate the regenerative energy generated from the electric motor 87. Detect whether or not. That is, the regenerative energy detection sensor 74 is connected between the commercial power source 81 and the converter 83 of the power converter 84 to detect whether the regenerative energy is generated. For example, the regenerative energy detection sensor 74 may determine that the regenerative energy is generated when a current or voltage of a sine wave or a square wave is detected.

In addition, the controller 79 is a microprocessor that performs an overall control operation of the energy storage system 70. When the controller 79 receives a signal from the regenerative energy detection sensor 74 that detects the regenerative energy generation, the controller 79 transfers the generated regenerative energy to the super capacitor module 73 through the DC-DC converter 71 and stores the generated regenerative energy.

On the other hand, if the control unit 79 does not receive a signal for detecting the generation of regenerative energy from the regenerative energy detection sensor 74, the control unit 79 may pause the operation of the DC-DC converter 71. Alternatively, an on / off switch is provided between the DC-DC converter 71 and the super capacitor module 73, and the controller 79 switches the on / off switch in accordance with the presence or absence of a detection signal from the regenerative energy detection sensor 74. Can switch

In order to confirm the energy saving of the elevator system 100 according to the present embodiment, the regenerative operation and the retrograde operation were performed as shown in FIG. 3. 3 is a graph showing the results of performing the regenerative operation and the retrograde operation of the elevator system according to an embodiment of the present invention.

Referring to Figure 3, it can be seen that by using the regenerative energy generated in the elevator can save more than 20% energy.

The supercapacitor 75 used in the energy storage system 70 according to the present embodiment will be described with reference to FIGS. 4 to 6 as follows. 4 illustrates a super capacitor 75 of the super capacitor module of FIG. 2. FIG. 5 is an enlarged view of a portion A of FIG. 4 and illustrates a state in which the upper terminal plate 40 is fixed to an upper portion of the case 30. 6 is a view showing the gas discharge unit 51 of FIG.

4 to 6, the supercapacitor 75 according to the present embodiment includes a power storage element 10, a lower terminal plate 20, a tubular case 30 made of a metal material, an upper terminal plate 40, and Rubber gasket 60. The electrical storage element 10 stores electrochemical energy. The lower terminal plate 20 is joined to the lower portion of the power storage element 10. The case 30 has an opening 31 formed at one side thereof, and the power storage element 10 is inserted through the opening 31 so that the lower terminal plate 20 faces the bottom surface. The upper terminal plate 40 is inserted into the opening 31 of the case 30 to be electrically connected to the power storage element 10, and is fixed to the upper end of the case 30 by beading and curling. . The gasket 60 is interposed between the upper terminal plate 40 and the case 30.

According to the shape of the case 30 according to the present embodiment, the electrochemical energy storage device 75 has been described as an example implemented in a cylindrical structure, but may also be implemented in the form of a square pillar.

The power storage element 10 includes a winding core 11 and an electrode stack 13 wound around the core 11. A bottom inner plate 15 and a top inner plate 17 are joined to the lower and upper portions of the electrode stack 13, respectively.

The electrode stack 13 includes a positive electrode, a negative electrode, a separator, and an electrolyte solution. The anode generates electrons by an oxidation reaction. The cathode absorbs the generated electrons to cause a reduction reaction. The separator is interposed between the negative electrode and the positive electrode to physically separate the negative electrode and the positive electrode to isolate the place where the oxidation reaction and the reduction reaction takes place to distinguish from each other. The electrolyte is a mobile medium of ions that stores electrical energy in the anode and cathode. In the electrode stack 13, the anode, the cathode, and the separator are sequentially wound around the core 11 to form an overall cylindrical shape. For example, the electrode stack 13 may have a cell structure that forms a super capacitor, an electric double layer capacitor (EDLC), and a lithium ion capacitor (LIC).

The case 30 is used to isolate the power storage element 10 from the outside, and may be manufactured in various materials and shapes according to the type of the power storage element 10. Case 30 is tubular, the opening 31 is formed on one side and the other side has a form that is blocked. The case 30 is provided with an internal space 33 through which the power storage element 10 can be inserted through the opening 31. As the material of the case 30, a metal material such as aluminum, stainless steel, or tin plated steel may be used.

In case 30, "B" represents a beading portion and "C" represents a curling portion. The beading portion is formed concave inward from the outer surface of the case 30. The curling portion is formed by bending the upper end of the case 30 to a C shape and bringing it into close contact with the gasket 60 and the insulating plate 49. As a result, the case 30 and the upper terminal plate 40 are electrically separated from each other.

The lower terminal plate 20 is bonded to the lower portion of the power storage element 10, but is bonded through the bottom inner plate 15. Laser welding or ultrasonic welding may be used as a method of bonding the lower terminal plate 20.

The upper terminal plate 40 is bonded to the upper portion of the power storage element 10, but is bonded through the top inner plate 17. Laser welding or ultrasonic welding may be used as the bonding method of the upper terminal plate 40.

In this case, the lower terminal plate 20 and the upper terminal plate 40 may be made of the same metal material as the case 30.

In addition, the bottom inner plate 15 and the top inner plate 17 are electrically connected to the front and bottom surfaces of the electrode stack 13, respectively. In addition, since the lower terminal plate 20 and the upper terminal plate 40 are electrically connected to the electrode stack 13 through the bottom inner plate 15 and the top inner plate 17, the axial type of the embodiment The output characteristic of the super capacitor 75 can be improved.

The upper terminal plate 40 includes a terminal plate body 41 having a terminal 47, an insulating plate 49, and a gas discharge unit 51. The terminal plate body 41 has a terminal 47 formed at an upper portion thereof, and a fastening hole 43 is formed at a central portion thereof. The insulating plate 49 is attached to the upper surface of the terminal plate body 41 outside the fastening hole 43, and the edge of the gasket 60 and the upper end of the curled case 30 are closely attached to the edge portion. In addition, the gas discharge part 51 is fastened to the fastening hole 43, and discharges gas generated in the case 30 to the outside through the fastening hole 43.

Here, the terminal 47 is formed to protrude from the central portion of the upper surface of the terminal plate body 41. The fastening hole 43 is formed in the inside of the terminal 47, and the insulating plate 49 is positioned below the terminal 47 on the outside of the terminal 47.

The insulating plate 49 prevents electrical short between the case 30 and the upper terminal plate 40. The insulating plate 49 allows the upper end of the case 30 to be curled to be stably in close contact with the upper terminal plate 40 together with the gasket 60. Here, the material of the insulating plate 49 may be a plastic material such as polyethylene (PE), polypropylene (PP), polyphenylene sulfide (PPS), polyetherether ketone (PEEK) or polytetrafluoroethylene (PTFE).

The gas discharge part 51 includes a rubber stopper 53 inserted into the lower portion of the fastening hole 43 and a sealing bolt 55 coupled to the fastening hole 43 of the upper portion of the rubber stopper 53. Herein, the fastening hole 43 has an insertion hole 44 connected to the lower surface of the terminal plate body 41 and a bolt fastening hole 45 having a larger inner diameter than the insertion hole 44 and to which the sealing bolt 55 is fastened. Include. The sealing bolt 55 is formed with a hole through the center portion.

The sealing bolt 55 presses the rubber stopper 53 to seal the fastening hole 43. When gas is generated in the internal space 33 of the case 30, the gas pushes the rubber stopper 53 toward the sealing bolt 55. When the rubber stopper 53 is contracted by the pressure acting on the gas, and a gap is generated between the rubber stopper 55 and the insertion hole 44, the gas escapes through the gap. The gas escaped through the gap between the rubber stopper 53 and the insertion hole 44 is discharged to the outside through the gap formed between the sealing bolt 55 and the sealing bolt 55 and the bolt fastening hole 45. do.

When the gas is discharged to some extent, the contracted rubber stopper 53 is restored to its original shape by the restoring force, thereby blocking the insertion hole 44 again.

Meanwhile, before sealing the fastening hole 43 through the gas discharge part 51, the electrolyte solution may be injected into the internal space 33 of the case 30 through the fastening hole 43. In this case, the injection of the electrolyte is preferably performed after the opening 31 of the case 30 is sealed with the upper terminal plate 40. After the injection of the electrolyte solution, the fastening hole 43 is sealed with the gas discharge part 51.

In addition, the gasket 60 suppresses leakage of the electrolyte between the case 30 and the upper terminal plate 40. Butyl rubber may be used as the material of the gasket 60.

In this way, the lower terminal plate 20, the power storage element 10, and the upper terminal plate 40 are inserted into the internal space 33 of the case 30 through the opening 31 of the case 30, and then the gasket 60. The upper end of the case 30 is in close contact with the upper terminal plate 40 by beading and curling to seal the opening 31 of the case 30. That is, in this embodiment, since the opening 31 of the case 30 can be sealed with the upper terminal plate 40 by beading and curling without welding to the upper terminal plate 40, the opening 31 of the case 30 is sealed. ) Sutures can be performed more simply. In addition, since the opening 31 of the case 30 can be sealed without welding, it is possible to solve the problem of leakage of the electrolyte solution through the existing welding portion, and also increase the rigidity against external impact.

The supercapacitor 75 according to the present embodiment has a hard structure and can simplify a manufacturing process. That is, since welding is performed only when the lower and upper terminal plates 20 and 40 are joined to the power storage element 10, the number of welding can be greatly reduced as compared with the conventional one. As a result, it is possible to suppress the occurrence of welding failure due to a large number of welding. By reducing the number of welding, it is possible to simplify the manufacturing process of the supercapacitor 75, thereby also increasing the reliability of the manufacturing process.

The supercapacitor 75 according to the present embodiment is generated in the case 30 through the gas discharge part 51 including the rubber stopper 53 and the sealing bolt 55 installed on the upper terminal plate 40. Since the gas to be used can be smoothly discharged to the outside, the structure of the gas discharge part 51 can be simplified.

On the other hand, the embodiments disclosed in the specification and drawings are merely presented specific examples to aid understanding, and are not intended to limit the scope of the present invention. It is apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be carried out in addition to the embodiments disclosed herein.

10: power storage element
11: core
13: electrode laminate
15: bottom inner plate
17: top inner plate
20: lower terminal plate
30: case
31: opening
33: interior space
40: upper terminal plate
41: terminal plate body
43: fastening hole
44: insertion hole
45: bolt fastening hole
47: terminal
49: insulation plate
51: gas outlet
53: rubber stopper
55: suture bolt
60: gasket
70: energy storage system
71: DC-DC converter
73: super capacitor module
74: regenerative energy detection sensor
75: super capacitor
77: Super Capacitor Management System
79: control unit
80: lift
81: commercial power
83: converter
84: power conversion unit
85: inverter
87: electric motor
89: pulley
91: boarding car
93: Balance Weight
100: elevator system

Claims (4)

A DC-DC converter connected in parallel between a converter connected to a commercial power source for supplying power to an electric motor of a lift and an inverter;
A super capacitor module connected in series with the DC-DC converter and having a plurality of super capacitors to supply power to the elevator by assisting the commercial power;
A regenerative energy detection sensor connected between the commercial power supply and the converter and detecting whether regenerative energy is generated from the electric motor; And
A controller configured to transfer the regenerative energy to the super capacitor module through the DC-DC converter and store the regenerative energy when the regenerative energy detection sensor detects generation of regenerative energy;
Elevator energy storage system using a regenerative energy comprising a. The method of claim 1, wherein the super capacitor module,
The plurality of super capacitors; And
A super capacitor management system managing the plurality of super capacitors;
Elevator energy storage system using the regenerative energy, characterized in that it comprises a. The method of claim 1,
The DC-DC converter controls the voltage of the super capacitor to be low when the elevator is lifted, and controls the voltage of the super capacitor to be high when the elevator is stopped. Storage system. The method of claim 1, wherein the plurality of super capacitors, respectively,
A storage device for storing electrochemical energy;
A lower terminal plate bonded to a lower portion of the power storage element;
A tubular case made of a metal material having an opening formed at one side thereof and having the power storage element inserted therein through the opening so that the lower terminal plate faces the bottom surface;
An upper terminal plate inserted into an opening of the case and electrically connected to the power storage element, the upper terminal plate being fixed by beading and curling to an upper end of the case; And
A rubber gasket interposed between the upper terminal plate and the case;
Elevator energy storage system using a regenerative energy comprising a.

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