CN218243073U - Super capacitor energy storage system of potential energy feedback system - Google Patents
Super capacitor energy storage system of potential energy feedback system Download PDFInfo
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- CN218243073U CN218243073U CN202222584072.8U CN202222584072U CN218243073U CN 218243073 U CN218243073 U CN 218243073U CN 202222584072 U CN202222584072 U CN 202222584072U CN 218243073 U CN218243073 U CN 218243073U
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Abstract
The utility model discloses a potential energy feedback system super capacitor energy storage system, its characterized in that: the device comprises a frequency converter, a braking device, an energy storage device, a motor and a transmission device, wherein the frequency converter is respectively and electrically connected with a power supply, the braking device, the energy storage device and the motor; the energy storage device comprises a DCDC module driving converter and a super-capacitor energy storage device, the super-capacitor energy storage device is electrically connected with the frequency converter through the DCDC module driving converter, and the DCDC module driving converter is used for controlling current to be input into or output from the super-capacitor energy storage device. The utility model realizes the recovery, storage and reutilization of the regenerated electric energy through the arrangement of the DCDC module driving converter and the super capacitor energy storage device; the multifunctional instrument panel and the protection control assembly provide a detection and protection means for the circuit; the whole using process of the device does not need manual participation, and the operation of the gantry crane is not influenced.
Description
Technical Field
The utility model relates to an energy storage system, concretely relates to potential energy feedback system super capacitor energy storage system.
Background
In the conventional single-transmission variable frequency driving system in a port, the gantry crane transfers the generated regenerative energy to the alternating current motor and then converts the regenerative energy into regenerative electric energy by the descending potential energy and the braking kinetic energy in the descending process of the hoisting mechanism and the deceleration process of other main mechanisms, and the variable frequency driving system configured by the single transmission generally converts the regenerative electric energy into heat energy by adopting a braking unit and a braking resistor for consumption. Then, the regenerated electric energy is converted into heat energy and is consumed uselessly, so that the energy waste and the electric energy loss are caused; the conventional single-transmission variable-frequency driving system at present also lacks a technical means for storing and reusing the driving system.
The conventional super capacitor is characterized in that the energy storage process of the super capacitor is a physical process, the super capacitor can be charged and discharged rapidly by large current, meanwhile, the super capacitor is long in service life, the charging and discharging frequency can reach more than 50 ten thousand times, and the super capacitor has the characteristics of large working voltage range and the like. The device is suitable for the working condition operation of frequent charging and discharging of the gantry crane.
Therefore, it is desirable to provide a super capacitor energy storage system, which recovers, stores and reuses the energy generated in the descending process or braking process to achieve the purpose of energy saving and consumption reduction.
SUMMERY OF THE UTILITY MODEL
The utility model discloses not enough to among the prior art, provide a potential energy feedback system super capacitor energy storage system to solve above-mentioned problem.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a super capacitor energy storage system of a potential energy feedback system is characterized in that: the energy-saving device comprises a frequency converter, a braking device, an energy storage device, a motor and a transmission device, wherein the frequency converter is respectively electrically connected with a power supply, the braking device, the energy storage device and the motor; the energy storage device comprises a DCDC module driving converter and a super-capacitor energy storage device, the super-capacitor energy storage device is electrically connected with the frequency converter through the DCDC module driving converter, and the DCDC module driving converter is used for controlling current to be input into or output from the super-capacitor energy storage device.
In order to optimize the technical scheme, the specific measures adopted further comprise:
furthermore, the super capacitor energy storage device comprises a plurality of capacitors and a capacitor management system, wherein the capacitors are electrically connected with the capacitor management system, and the capacitor management system is used for monitoring and managing the operation condition of the capacitors.
Further, 16 capacitors are included, 8 capacitors are connected in series to form a group of capacitors, and the two groups of capacitors are connected in parallel.
Further, the power of the DCDC module driving converter is not less than half of the power of the motor.
The multifunctional instrument panel is electrically connected with the DCDC module driving converter; the multifunctional instrument panel is used for recording and displaying.
Further, the protection control device also comprises a protection control component, wherein the protection control component comprises a first Hall current sensor; the first Hall current sensor is electrically connected with the multifunctional instrument panel and used for reading current and carrying out electric energy statistics on the multifunctional instrument panel.
Furthermore, the protection control assembly also comprises a fuse, a second Hall current sensor and a PLC; the second Hall current sensor is electrically connected with the capacitor and is in communication connection with the PLC, the second Hall current sensor is used for detecting current and feeding the current back to the PLC, and the PLC is used for controlling the DCDC module to drive the converter to disconnect the circuit.
Furthermore, the frequency converter comprises a frequency converter rectifying circuit, a direct-current high-voltage bus and a frequency converter inverting circuit, the braking device comprises a braking unit and a braking resistor, the braking resistor is electrically connected with the direct-current high-voltage bus through the braking unit, and the super-capacitor energy storage device drives the converter to be electrically connected with the direct-current high-voltage bus through the DCDC module.
The utility model has the advantages that:
the utility model realizes the recovery, storage and reutilization of the regenerated electric energy through the arrangement of the DCDC module driving converter and the super capacitor energy storage device; the multifunctional instrument panel and the protection control assembly provide a detection and protection means for the circuit; the whole use of this device need not artifical the participation, and the switching is quick, does not influence the quick-witted operation of door.
Drawings
Fig. 1 is a schematic diagram of the electric energy recovery mode of the present invention;
FIG. 2 is a schematic diagram of the power utilization mode of the present invention;
fig. 3 is a schematic diagram of the connection of the super capacitor energy storage device of the present invention.
Reference numerals: 1. the system comprises a power supply, 2 parts of a frequency converter, 21 parts of a frequency converter rectifying circuit, 22 parts of a direct-current high-voltage bus, 23 parts of a frequency converter inverting circuit, 3 parts of a motor, 4 parts of a transmission device, 5 parts of a weight, 6.DCDC module driving current transformer, 7 parts of a super capacitor energy storage device, 8 parts of a braking unit, 9 parts of a braking resistor, 10 parts of a multifunctional instrument panel, 11 parts of a capacitor management system, 12 parts of a fuse, 13 parts of a first Hall current sensor and 14 parts of a second Hall current sensor.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
It should be noted that, in the present invention, the terms such as "upper", "lower", "left", "right", "front", "rear", etc. are used for clarity of description only, and are not used to limit the scope of the present invention, and the relative relationship between the terms may be changed or adjusted without substantial technical changes.
As shown in the accompanying drawings, the utility model discloses a potential energy feedback system super capacitor energy storage system, its characterized in that: the energy-saving device comprises a frequency converter 2, a braking device, an energy storage device, a motor 3 and a transmission device 4, wherein the frequency converter 2 is respectively electrically connected with a power supply 1, the braking device, the energy storage device and the motor 3, the motor 3 is connected with the transmission device 4, the transmission device 4 is connected with a heavy object 5, and the motor 3 is used for driving the transmission device 4 to control the heavy object 5 to lift; the energy storage device comprises a DCDC module driving converter 6 and a super-capacitor energy storage device 7, wherein the super-capacitor energy storage device 7 is electrically connected with the frequency converter 2 through the DCDC module driving converter 6, and the DCDC module driving converter 6 is used for controlling current to be input into or output from the super-capacitor energy storage device 7. Therefore, the regenerative electric energy is stored in the super capacitor energy storage device 7 through the DCDC module driving converter 6, and is input to the frequency converter 2 through the DCDC module driving converter 6 when needed, so as to be used by the motor 3.
Referring to fig. 3, in this embodiment, the super capacitor energy storage device 7 includes a plurality of capacitors and a capacitor management system 11, the capacitors are electrically connected to the capacitor management system 11, and the capacitor management system 11 can be in communication with the 4G gateway through ethernet, and upload the real-time status of the super capacitor energy storage device 7 to a central control room, so as to monitor and manage the operation condition of the capacitors of the super capacitor energy storage device 7 at any time.
The capacitor comprises 16 capacitors, wherein 8 capacitors are connected in series to form a group of capacitors, and the two groups of capacitors are connected in parallel. The DCDC module driving converter 6 is mainly used for type selection according to the power of the motor 3, and the power of the DCDC module driving converter 6 is not less than half of the power of the motor 3.
In the embodiment, the multifunctional instrument panel 10 is further included, and the multifunctional instrument panel 10 is electrically connected with the DCDC module driving converter 6; the multifunctional instrument panel 10 is used for recording and displaying the power saving rate and the energy saving rate of the electric energy of the super-capacitor energy storage device 7 in the whole operation process, recording and counting the recovered potential energy and the utilized electric energy, and displaying various state parameters of the capacitor in the operation process, such as module voltage, module temperature, charging and discharging current, potential energy recovery capacity and the like.
In this embodiment, a protection control component is further included, and the protection control component includes a first hall current sensor 13; the first hall current sensor 13 is electrically connected with the multifunctional instrument panel 10 and is used for reading current and carrying out electric energy statistics on the multifunctional instrument panel 10.
The protection control assembly further comprises a fuse 12, a second Hall current sensor 14 and a PLC; the second hall current sensor 14 is connected with the capacitor circuit and is in communication connection with the PLC, the second hall current sensor 14 is used for detecting current and feeding the current back to the PLC, and the PLC is used for controlling the DCDC module to drive the converter 6 to disconnect the direct current circuit. Therefore, the current display electric energy data condition is read through the first Hall current sensor 13, the overcurrent condition is fed back to the PLC through the second Hall current sensor 14, and the PLC controls the DCDC module to drive the converter 6 to cut off the circuit, so that the whole circuit is protected; the fuse 12 is used to further protect the circuit.
In this embodiment, the frequency converter 2 includes a frequency converter rectifying circuit 21, a direct-current high-voltage bus 22 and a frequency converter inverting circuit 23, the braking device includes a braking unit 8 and a braking resistor 9, the braking resistor 9 is electrically connected with the direct-current high-voltage bus 22 through the braking unit 8, and the super-capacitor energy storage device 7 is electrically connected with the direct-current high-voltage bus 22 through the DCDC module driving converter 6.
The utility model discloses a super capacitor energy memory's electric capacity design lectotype demonstration to 25 t's door machine is the example.
According to the potential energy formula of the weight: e = mgh eta
In the formula: m is the weight of the weight 5, such as the rated lifting capacity m =25t of the gantry crane; g is gravity acceleration, =9.8 m/s 2; h is the effective descending distance, and h =30 m; eta is mechanical transmission efficiency, and eta =0.8 to 0.85.
I.e., E = mgh η =25 × 9.8 × 30.85 = 6247.5kj,6247.5/3600=1.735kw.h
Therefore, the method comprises the following steps: when the gantry crane has the maximum load of 25t, the potential energy of the heavy object can be converted into electric energy in a single descending process and in a descending maximum stroke, namely the storage capacity of the capacitor design parameter of the super-capacitor energy storage device 7 is 1.735 KW.h; the capacitor voltage range is DC 200-DC 512V; the capacitor discharge current is 300A.
Since capacitance is the physical quantity of the capacitor in the capacity to hold charge, in the international system of units, C = Q/U, but the magnitude of capacitance is not determined by Q or U, but C = epsilon S/4 pi k d.
In the formula: ε is a constant, dependent on the nature of the dielectric; s is the area of the capacitor plate; k is the constant of the electrostatic force; d is the distance of the capacitor plate.
Therefore: and determining the rated capacity, rated current, capacitance farad and other parameters of the determined capacitor bank.
When the parameters of a single capacitor bank are 64V125F and C1-C16, the capacitor bank is configured in a 2-to-8-string connection mode according to the figure 3.
The total capacitance of the supercapacitor energy storage device 7 is thus: ctotal =
+
=31.25F
According to a capacitor module electric energy calculation formula: e = CU2/2
In the formula: e is the maximum capacitance of the capacitor; u is the maximum potential difference between two stages of the capacitor; c is the total capacitance of the capacitor module; then E = CU2/2=31.25 × 640/2=6400000j =1.77 kw.h
From the formula: when the door machine descends, the energy converted from the potential energy of the weight can be stored in the energy storage device of the super capacitor, and the energy is consumed for storage in the next ascending process.
The utility model discloses an use, when super capacitor energy memory 7 is in when retrieving the electric energy mode, 5 heavy loads operations of heavy object are when the decline process, and the system is in the power generation state, with the energy repayment of electricity generation output to the direct current high voltage generating line 22 of converter 2, lead to direct current high voltage generating line 22 voltage to rise. Different starting working thresholds are set for the DCDC module driving converter 6 and the brake unit 8 respectively in starting work, and the working threshold of the DCDC module driving converter 6 is smaller than that of the brake unit 8. When the voltage of the direct-current high-voltage bus 22 rises to the working threshold of the DCDC module driving converter 6, the DCDC module driving converter 6 starts to work, and the energy of the direct-current high-voltage bus 22 is preferentially stored in the super-capacitor energy storage device 7.
When the super-capacitor energy storage device 7 is in an electric energy utilization mode, the heavy object 5 runs in a lifting process under heavy load, the system is in an electric energy consumption state, the voltage of the direct-current high-voltage bus 22 of the frequency converter 2 is reduced, and when the direct-current high-voltage bus 22 is lower than the lower limit threshold value of the starting work of the DCDC module driving converter 6, the DCDC module driving converter 6 starts to work, so that the electric energy stored by the super-capacitor energy storage device 7 is released into the direct-current high-voltage bus 22 to be preferentially used, and the consumption of the power supply 1 is reduced.
In this embodiment, the operation threshold of the braking unit 8 is set at 660V, and in order to ensure the preferential start of the energy storage device, the upper limit threshold of the operation of the DCDC module drive converter 6 is set at 640V, and the lower limit threshold is set at 565V. When the system enters a power generation state, when the voltage of the direct-current high-voltage bus 22 rises to 565V to 640V, the energy storage device automatically starts to work, and feedback energy is stored in the super-capacitor energy storage device 7; when the system enters an electric state, the voltage of the direct-current high-voltage bus 22 is reduced to be lower than 565V, the energy storage device automatically starts to work, and the energy stored by the super-capacitor energy storage device 7 is released to the direct-current high-voltage bus 22 for normal operation consumption of the motor 3.
When the instantaneous voltage of the direct-current high-voltage bus 22 exceeds 660V due to the energy fed back by the motor 3, the braking unit 8 and the braking resistor 9 work synchronously to consume the electric energy, and the reliable, stable and normal operation of the whole system is ensured. In the ascending process of the weight 5, when the voltage of the direct-current high-voltage bus 22 is reduced to 540V, the energy in the super-capacitor energy storage device 7 cannot meet the voltage of the motor 3 during operation, at the moment, the super-capacitor energy storage device 7 serves as backup supplementary energy, the voltage of the direct-current high-voltage bus 22 is mainly supplied by a power grid serving as a power supply 1 to generate electric energy serving as energy consumed in the ascending process of the weight 5, and the frequency converter 2 normally operates in a conventional mode state.
When the energy in the super capacitor energy storage device 7 is reduced to the lowest value of the set storage capacity, no potential energy is supplemented; the DCDC module drives the converter 6 to cut off the direct current loop until the voltage of the direct current high-voltage bus 22 reaches the charging threshold next time, the energy storage device enters the charging state, the direct current loop is switched on, and normal operation is recovered.
Above only the utility model discloses a preferred embodiment, the utility model discloses a scope not only limits in above-mentioned embodiment, and the fan belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope. It should be noted that various modifications and decorations can be made by those skilled in the art without departing from the principle of the present invention, and the scope of the present invention should be considered as the protection scope of the present invention.
Claims (8)
1. A super capacitor energy storage system of a potential energy feedback system is characterized in that: the energy-saving device comprises a frequency converter (2), a braking device, an energy storage device, a motor (3) and a transmission device (4), wherein the frequency converter (2) is respectively electrically connected with a power supply (1), the braking device, the energy storage device and the motor (3), the motor (3) is connected with the transmission device (4), the transmission device (4) is connected with a heavy object (5), and the motor (3) is used for driving the transmission device (4) to control the heavy object (5) to lift; the energy storage device comprises a DCDC module driving converter (6) and a super-capacitor energy storage device (7), the super-capacitor energy storage device (7) is electrically connected with the frequency converter (2) through the DCDC module driving converter (6), and the DCDC module driving converter (6) is used for controlling current to be input into or output out of the super-capacitor energy storage device (7).
2. The super capacitor energy storage system of claim 1, wherein: the super-capacitor energy storage device (7) comprises a plurality of capacitors and a capacitor management system (11), the capacitors are electrically connected with the capacitor management system (11), and the capacitor management system (11) is used for monitoring and managing the operation condition of the capacitors.
3. The super capacitor energy storage system of claim 2, wherein: the capacitor comprises 16 capacitors, wherein 8 capacitors are connected in series to form a group of capacitors, and the two groups of capacitors are connected in parallel.
4. The super capacitor energy storage system of claim 3, wherein: the power of the DCDC module driving converter (6) is not less than half of the power of the motor (3).
5. The super capacitor energy storage system of claim 2 or 4, wherein: the multifunctional instrument panel (10) is electrically connected with the DCDC module driving converter (6); the multifunctional instrument panel (10) is used for recording and displaying.
6. The super capacitor energy storage system of claim 5, wherein: the protection control assembly comprises a first Hall current sensor (13); the first Hall current sensor (13) is electrically connected with the multifunctional instrument panel (10) and is used for reading current and carrying out electric energy statistics on the multifunctional instrument panel (10).
7. The super capacitor energy storage system of claim 6, wherein: the protection control assembly further comprises a fuse (12), a second Hall current sensor (14) and a PLC; the second Hall current sensor (14) is electrically connected with the capacitor and is in communication connection with the PLC, the second Hall current sensor (14) is used for detecting current and feeding the current back to the PLC, and the PLC is used for controlling the DCDC module to drive the converter (6) to disconnect a circuit.
8. The super capacitor energy storage system of claim 7, wherein: the frequency converter (2) comprises a frequency converter rectifying circuit (21), a direct-current high-voltage bus (22) and a frequency converter inverting circuit (23), the braking device comprises a braking unit (8) and a braking resistor (9), the braking resistor (9) is electrically connected with the direct-current high-voltage bus (22) through the braking unit (8), and the super-capacitor energy storage device (7) is electrically connected with the direct-current high-voltage bus (22) through a DCDC module driving converter (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202222584072.8U CN218243073U (en) | 2022-09-29 | 2022-09-29 | Super capacitor energy storage system of potential energy feedback system |
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| CN202222584072.8U CN218243073U (en) | 2022-09-29 | 2022-09-29 | Super capacitor energy storage system of potential energy feedback system |
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| CN218243073U true CN218243073U (en) | 2023-01-06 |
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