Direct current charging and feeding cabinet system

Abstract

The utility model discloses a direct current charging and feeding cabinet system which comprises a power distribution cabinet, an ATS power supply switching device is arranged in the power distribution cabinet, the input end of the ATS power supply switching device is connected with two power lines in parallel, and the output end of the ATS power supply switching device is connected with a bus through an AC / DC converter. A feeder unit, a data acquisition unit, a feeder feedback unit, a control power supply branch and a discharge loop are connected in parallel to the bus, and a super capacitor bank is connected to the discharge loop. According to the utility model, the super capacitor bank is adopted to replace the traditional lead-acid battery, and has the functions of long service life and rapid charging and discharging. And the voltage and temperature acquisition board sends the acquired voltage value and temperature value of the super capacitor bank to the data acquisition unit and displays the voltage value and temperature value on the first display screen in real time. When discharging is needed, rapid discharging is achieved and power supply protection is carried out through cooperation of the super capacitor bank and the DC / DC device in the discharging loop.

Description

Technical Field

[0001] This utility model relates to the field of power distribution cabinet technology, and in particular to a DC charging and feeding cabinet system. Background Technology

[0002] In DC charging and discharging cabinets, lead-acid batteries, as a traditional energy storage device, have a certain application basis, but also have many drawbacks. For example, lead-acid batteries have a limited cycle life, typically within 300 to 500 charge-discharge cycles. This means that in applications requiring frequent charging and discharging, lead-acid batteries need to be replaced frequently, increasing maintenance costs and system unreliability. Moreover, lead-acid batteries charge slowly, typically requiring 14 to 16 hours to fully charge. This is extremely inconvenient in applications requiring rapid charging, such as instantaneous grid response and backup power.

[0003] Due to the aforementioned drawbacks of lead-acid batteries, they struggle to meet the requirements of modern power systems for rapid response, high reliability, and long lifespan. Supercapacitors, on the other hand, can complete charging and discharging in extremely short times, with a charging and discharging rate far exceeding that of lead-acid batteries. For example, a supercapacitor can be charged in seconds, while a lead-acid battery typically requires several hours. Furthermore, supercapacitors have an extremely long cycle life, often reaching hundreds of thousands or even millions of cycles. Therefore, supercapacitors can effectively solve the problems associated with lead-acid batteries and improve the overall performance of DC charging and discharging cabinets. However, supercapacitors experience a significant voltage drop during discharge. To match the low voltage of the power battery, a DC / DC converter needs to be connected in series to boost the supercapacitor voltage. Therefore, there is an urgent need to design a distribution cabinet with circuit protection capabilities. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a DC charging and feeding cabinet system to solve the issues of low lifespan and slow response caused by the use of lead-acid batteries in existing DC charging and feeding cabinets.

[0005] This utility model is implemented as follows:

[0006] A DC charging and feeding cabinet system includes a power distribution cabinet, which is equipped with an ATS power switching device. The input terminal of the ATS power switching device is connected in parallel with two power lines. The output terminal of the ATS power switching device is connected to a bus via an AC / DC converter. The bus is connected in parallel with a feeder unit, a data acquisition unit, a feeder feedback unit, a control power branch, and a discharge circuit. A supercapacitor bank and a discharge resistor are connected to the discharge circuit.

[0007] Furthermore, a DC / DC converter is provided on the discharge circuit. The input terminal of the DC / DC converter is connected to the output terminal of the bus, and a supercapacitor bank and a discharge resistor are connected in parallel to the output terminal of the DC / DC converter.

[0008] Furthermore, the input terminal of the DC / DC device is connected to a first DC switch and a first indicator light, the output terminal of the DC / DC device is connected to a second DC switch and a second indicator light, and the input terminal of the discharge resistor is connected to a discharge switch.

[0009] Furthermore, a DC24V power converter is connected between the input terminal of the control power supply branch and the bus, and a voltage and temperature acquisition board and a relay are also connected to the control power supply branch.

[0010] Furthermore, the voltage and temperature acquisition board is connected to the supercapacitor bank, and the front of the distribution cabinet is also equipped with a first display screen and a second display screen. The first display screen is connected to the voltage and temperature acquisition board and communicates with the DC / DC device and the data acquisition unit.

[0011] Furthermore, the data acquisition unit and the feeder feedback unit are connected via CAN communication, and the data acquisition unit and the first display screen are connected via 485 communication.

[0012] Furthermore, the feeder unit includes 16 feeders arranged in parallel, each feeder being connected to an insulation detection sensor, a feeder switch, and a feeder indicator light.

[0013] Furthermore, the feeder feedback unit is connected to the feeder unit, and the feeder feedback unit and the second display screen are connected by communication.

[0014] Furthermore, surge protectors are installed on both power lines.

[0015] Furthermore, the output of the ATS power switching device is equipped with an AC switch, and an AC indicator light is connected between the AC switch and the AC / DC converter.

[0016] The beneficial effects of this utility model are:

[0017] This utility model's DC charging and discharging cabinet system uses a supercapacitor bank to replace the traditional lead-acid battery, featuring long lifespan and rapid charging and discharging capabilities. A voltage and temperature acquisition board collects the voltage and temperature values ​​of the supercapacitor bank and sends them to a data acquisition unit, where they are displayed in real-time on a first display screen. When discharge is required, the supercapacitor bank and DC / DC converter in the discharge circuit work together to achieve rapid discharge and provide power protection. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the DC charging and feeding cabinet system of this utility model;

[0019] Figure 2 This is the wiring diagram of this utility model;

[0020] Figure 3 This is a connection diagram of the supercapacitor bank of this utility model;

[0021] Figure 4 This is the wiring diagram of the voltage and temperature acquisition board of this utility model. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Many specific details are set forth in the following description to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0023] like Figures 1-4 The diagram shows the DC charging and feeding cabinet system of this utility model, which includes a power distribution cabinet. The power distribution cabinet is equipped with an ATS power switching device. The input terminal of the ATS power switching device is connected in parallel with two power lines. The output terminal of the ATS power switching device is connected to the bus through an AC / DC converter. The bus is connected in parallel with a feeder unit, a data acquisition unit, a feeder feedback unit, a control power branch, and a discharge circuit. A supercapacitor bank and a discharge resistor are connected to the discharge circuit.

[0024] like Figure 2 As shown, the input terminal of the ATS power switching device is connected in parallel to two power lines, both of which are equipped with surge protectors to protect electrical components. The two power lines are a main power line and a secondary power line, respectively, and their input voltage can be 220V or 380V, which is not limited here; the setting and selection can be based on actual needs. The ATS power switching device is used to switch between the two power lines. The output terminal of the ATS power switching device is connected to the bus via an AC / DC converter. The output terminal of the ATS power switching device is equipped with an AC switch BK, and an AC indicator light is connected between the AC switch BK and the AC / DC converter. In this embodiment, there are three AC / DC converters connected in parallel. The distribution cabinet has four mounting ports for installing the AC / DC converters, leaving one port empty for future backup. Alternatively, three mounting ports can be set according to the number of AC / DC converters; this is not limited here, and the number of mounting ports and AC / DC converters can be set according to design requirements. Multiple charging modules are connected on the line between the AC switch and the AC / DC converters to charge the entire power circuit.

[0025] The busbar input is equipped with a third DC switch K1 and a third DC indicator light. A feeder unit, data acquisition unit, feeder feedback unit, control power supply branch, and discharge circuit are connected in parallel on the busbar. A supercapacitor bank is connected to the discharge circuit. A DC / DC converter is installed on the discharge circuit to convert high-voltage DC to low-voltage DC. The input of the DC / DC converter is connected to the output of the busbar, and the output of the DC / DC converter is connected in parallel with the supercapacitor bank and a discharge resistor. The input of the DC / DC converter is connected to a first DC switch K3 and a first indicator light, and the output of the DC / DC converter is connected to a second DC switch K2 and a second indicator light. A discharge switch is connected to the input of the discharge resistor. The first DC switch K3 is the high-voltage side switch of the DC / DC converter, and the second DC switch K2 is the low-voltage side switch. The first and second indicator lights are used to display the on / off status of the first DC switch K3 and the second DC switch K2. A discharge switch is connected to the input of the discharge resistor to control whether the discharge resistor is discharging.

[0026] like Figure 3 As shown, the supercapacitor bank consists of eight interconnected capacitors, namely C1-C8. Among them, four capacitors C1-C4 are connected in series, four capacitors C5-C8 are connected in series, and then two series-connected capacitor banks are connected in parallel.

[0027] like Figure 2 and Figure 4 As shown, a DC24V power converter is connected between the input terminal of the control power supply branch and the bus. A voltage and temperature acquisition board and a relay are also connected to the control power supply branch. The voltage and temperature acquisition board is connected to the supercapacitor bank to acquire the temperature and voltage values ​​of each capacitor in the supercapacitor bank. In this embodiment, two voltage and temperature acquisition boards are used. One board is connected to capacitors C1-C4 of the supercapacitor bank, and the other board is connected to capacitors C5-C8 of the supercapacitor bank to acquire the temperature and voltage values ​​of each capacitor respectively.

[0028] like Figure 1As shown, the front of the distribution cabinet also features a first display screen and a second display screen. The first display screen is connected to the voltage and temperature acquisition board and communicates with the DC / DC device and data acquisition unit. The first display screen displays the temperature and voltage values ​​of each capacitor in the supercapacitor bank and the status of the DC / DC device. The data acquisition unit communicates with the feeder feedback unit via CAN, with the data acquisition unit communicating with the first display screen and the charging module via RS-485, and with the data acquisition unit communicating with the second display screen via RS-232. The feeder unit includes 16 feeders connected in parallel, designated as feeder 1-feeder 16. Each feeder is connected to an insulation detection sensor, a feeder switch, and a feeder indicator light. The 16 feeder switches are KK1-KK16 in the diagram. The feeder feedback unit is connected to the feeder unit, and communicates with the second display screen. Specifically, the feeder feedback unit communicates with the data acquisition unit, and the data acquisition unit communicates with the second display screen via RS-232.

[0029] Data collected by insulation monitoring sensors on each feeder in the feeder unit, along with the feeder's continuity status, are sent to the feeder feedback unit. The feeder feedback unit then sends the collected data to the data acquisition unit, which in turn sends the data to the second display screen. The second display screen shows real-time information about the feeder unit (insulation detection status on the 16 feeders), the AC / DC converter status, and the data acquisition unit status. The temperature and voltage values ​​of each capacitor in the supercapacitor bank are collected by a voltage and temperature acquisition board and sent to the first display screen for real-time display. When charging is required, the system is connected to a 380VAC / 220VAC power supply. Then, the AC switch BK, the third DC switch K1, the first DC switch K3, and the second DC switch K2 are closed, and charging of the module begins. When discharging is required, the discharge switch is closed, and rapid discharge occurs through the discharge resistor and the supercapacitor bank to protect the power supply.

[0030] While this utility model discloses preferred embodiments to achieve the above objectives, it is not intended to limit the structural features of this utility model. Anyone skilled in the art should know that any easily conceivable variations or modifications are possible under the technical spirit of this utility model and are covered by the patent claims of this utility model.

Claims

1. A DC charging / feeding cabinet system, characterized in that, The device includes a power distribution cabinet, which contains an ATS power switching device. The input of the ATS power switching device is connected in parallel to two power lines. The output of the ATS power switching device is connected to a bus via an AC / DC converter. The bus is connected in parallel to a feeder unit, a data acquisition unit, a feeder feedback unit, a control power branch, and a discharge circuit. The discharge circuit is connected to a supercapacitor bank and a discharge resistor.

2. The DC charging / feeding cabinet system according to claim 1, characterized in that, The discharge circuit is equipped with a DC / DC device, the input terminal of which is connected to the output terminal of the bus, and the output terminal of the DC / DC device is connected in parallel with a supercapacitor bank and a discharge resistor.

3. The DC charging / feeding cabinet system according to claim 2, characterized in that, The input terminal of the DC / DC device is connected to a first DC switch and a first indicator light, the output terminal of the DC / DC device is connected to a second DC switch and a second indicator light, and the input terminal of the discharge resistor is connected to a discharge switch.

4. The DC charging / feeding cabinet system according to claim 2, characterized in that, A DC24V power converter is connected between the input terminal of the control power supply branch and the bus. A voltage and temperature acquisition board and a relay are also connected to the control power supply branch.

5. The DC charging / feeding cabinet system according to claim 4, characterized in that, The voltage and temperature acquisition board is connected to the supercapacitor group. The front of the power distribution cabinet is also provided with a first display screen and a second display screen. The first display screen is connected to the voltage and temperature acquisition board and is communicatively connected to the DC / DC device and the data acquisition unit.

6. The DC charging / feeding cabinet system according to claim 5, characterized in that, The data acquisition unit and the feeder feedback unit are connected via CAN communication, and the data acquisition unit and the first display screen are connected via 485 communication.

7. The DC charging and feeding cabinet system according to claim 1, characterized in that, The feeder unit includes 16 feeders arranged in parallel, and each feeder is connected to an insulation detection sensor, a feeder switch and a feeder indicator light.

8. The DC charging / feeding cabinet system according to claim 5, characterized in that, The feeder feedback unit is connected to the feeder unit, and the feeder feedback unit and the second display screen are connected via RS-232 communication.

9. The DC charging / feeding cabinet system according to claim 1 or 2, characterized in that, Both power lines are equipped with surge protectors.

10. The DC charging / feeding cabinet system according to claim 1, characterized in that, The output terminal of the ATS power switching device is equipped with an AC switch, and an AC indicator light is connected between the AC switch and the AC / DC converter.

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