Energy storage type charging pile system control system and control logic

Abstract

The invention discloses an energy storage type charging pile system control system and control logic, the energy storage type charging pile system control system comprises a charging pile module, a power distribution module, an energy storage module and a monitoring and management platform, one end of the power distribution module is connected to a power grid, and the power distribution module comprises an intelligent electric meter, a circuit breaker and a contactor; the other end of the power distribution module is electrically connected with the charging pile module and the energy storage module through wires. The monitoring and management platform is electrically connected with the charging pile module, the power distribution module and the energy storage module through wires. The invention belongs to the technical field of charging piles, and particularly relates to an energy storage type charging pile system control system and control logic.

Description

Technical Field

[0001] The present invention belongs to the technical field, and in particular relates to a control system and control logic of an energy storage charging pile system. Background Art

[0002] With the rapid development of renewable energy such as solar energy and wind energy, its intermittent and unstable nature has brought challenges to the power grid. The energy storage charging pile system can store electricity when there is excess renewable energy generation, and charge electric vehicles during peak power consumption or when renewable energy generation is insufficient, thus playing a role in regulating energy supply and demand, promoting the consumption of renewable energy, and promoting the transformation of energy structure to clean and low-carbon.

[0003] The number of electric vehicles is growing rapidly, and the demand for charging facilities is also increasing. Traditional charging piles draw electricity directly from the power grid, which may cause problems such as excessive load and voltage fluctuations in the local power grid during peak charging. For charging pile operators and users, reasonable energy management and cost control are crucial. At this stage, the charging pile system cannot take advantage of the peak-valley electricity price difference, which increases the charging cost. At the same time, it is impossible to achieve accurate management of the charging and discharging of energy storage equipment, which reduces the service life of energy storage equipment and increases operating costs. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the existing technology that it is unable to utilize the peak-valley electricity price difference and accurately manage the charging and discharging of energy storage equipment.

[0005] The technical solution adopted by the present invention is as follows: a control system for an energy storage charging pile system, comprising a charging pile module, a power distribution module, an energy storage module and a monitoring and management platform, wherein one end of the power distribution module is connected to the power grid, and the power distribution module comprises a smart meter, a circuit breaker, and a contactor. The other end of the power distribution module is electrically connected to the charging pile module and the energy storage module through wires, and the monitoring and management platform is electrically connected to the charging pile module, the power distribution module, and the energy storage module through wires.

[0006] Furthermore, the charging pile module includes a vehicle detection unit, a parameter adjustment unit, a constant current charging unit, a voltage detection unit, a constant voltage charging unit and a current detection unit. The vehicle detection unit, the parameter adjustment unit, the constant current charging unit, the voltage detection unit, the constant voltage charging unit and the current detection unit are sequentially connected in series into the main circuit. The voltage detection unit and the current detection unit are respectively connected in parallel with an abnormality detection unit, and the other end of the abnormality detection unit is electrically connected to the main circuit switch.

[0007] Furthermore, the energy storage module includes a calibration unit, a BMS monitoring unit, a bidirectional DC-AC converter and a discharge power control unit. The calibration unit includes interface 1, interface 2 and interface 3. Interface 1 is connected to the grid power, interface 2 is connected in series to the BMS monitoring unit and the bidirectional DC-AC converter, and interface 3 is connected to the discharge power control unit power through a wire.

[0008] Furthermore, the vehicle detection unit includes an identification module and a data processing module, and the data processing module is connected to a large database of vehicle information.

[0009] Furthermore, the calibration unit accesses and determines the real-time data of the peak and valley of the power grid.

[0010] After adopting the above structure, the beneficial effects of the present invention are as follows:

[0011] (1) Through the linkage setting of the vehicle detection unit, parameter adjustment unit, constant current charging unit, voltage detection unit, constant voltage charging unit and current detection unit in the charging pile module, a constant voltage and constant current charging method is adopted. First, constant current charging is used. When the battery voltage reaches the set value, constant voltage charging is switched. The abnormality detection unit continuously monitors the voltage and current in real time to see if they are abnormal, and stops charging and issues an alarm.

[0012] (2) Through the linkage setting of the calibration unit, BMS monitoring unit, bidirectional DC-AC converter and discharge power control unit in the energy storage module, during the off-peak period of the power grid, the monitoring center controls the bidirectional converter to draw power from the power grid to charge the energy storage unit according to the real-time electricity price and the charge state of the energy storage unit; during the charging peak period or when the power supply of the power grid is insufficient, the monitoring center controls the bidirectional converter to release the power of the energy storage unit to the charging pile to meet the charging needs of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0014] Figure 1 A schematic diagram of the overall system architecture flow chart proposed by the present invention;

[0015] Figure 2 This is a schematic diagram of the charging control process proposed by the present invention;

[0016] Figure 3 This is a schematic diagram of the energy storage charging and discharging control process proposed by the present invention.

[0017] In the attached drawings: 1. Charging pile module, 2. Power distribution module, 3. Energy storage module, 4. Monitoring and management platform, 5. Vehicle detection unit, 6. Parameter adjustment unit, 7. Constant current charging unit, 8. Voltage detection unit, 9. Constant voltage charging unit, 10. Current detection unit, 11. Abnormality detection unit, 12. Calibration unit, 13. BMS monitoring unit, 14. Bidirectional DC-AC converter, 15. Discharge power control unit. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0020] like Figure 1 As shown, a control system and control logic of an energy storage charging pile system are provided, which includes a charging pile module 1, a power distribution module 2, an energy storage module 3 and a monitoring and management platform 4. One end of the power distribution module 2 is connected to the power grid. The power distribution module 2 includes a smart meter, a circuit breaker, and a contactor. The other end of the power distribution module 2 is electrically connected to the charging pile module 1 and the energy storage module 3 through wires. The monitoring and management platform 4 is electrically connected to the charging pile module 1, the power distribution module 2, and the energy storage module 3 through wires.

[0021] like Figure 2 As shown, the charging pile module 1 includes a vehicle detection unit 5, a parameter adjustment unit 6, a constant current charging unit 7, a voltage detection unit 8, a constant voltage charging unit 9 and a current detection unit 10. The vehicle detection unit 5, the parameter adjustment unit 6, the constant current charging unit 7, the voltage detection unit 8, the constant voltage charging unit 9 and the current detection unit 10 are sequentially connected in series into the main circuit, and the voltage detection unit 8 and the current detection unit 10 are respectively connected in parallel with an abnormality detection unit 11, and the other end of the abnormality detection unit 11 is electrically connected to the main circuit switch.

[0022] The vehicle detection unit 5 includes an identification module and a data processing module, and the data processing module is connected to a large vehicle information database.

[0023] like Figure 3 As shown, the energy storage module 3 includes a calibration unit 12, a BMS monitoring unit 13, a bidirectional DC-AC converter 14 and a discharge power control unit 15. The calibration unit 12 includes interface 1, interface 2 and interface 3. Interface 1 is connected to the grid power, interface 2 is connected in series to the BMS monitoring unit 13 and the bidirectional DC-AC converter 14, and interface 3 is connected to the discharge power control unit 15 through a wire.

[0024] The calibration unit 12 accesses and determines the real-time data of the high and low valleys of the power grid.

[0025] The control logic of a storage charging pile system control system is as follows:

[0026] like Figure 1 As shown, the overall system architecture process is as follows:

[0027] 1) Start: Start the new energy storage charging pile system;

[0028] 2) Power distribution module 2: connects to the power grid, introduces electric energy into the system, provides power input for charging pile module 1 and energy storage module 3, and distributes electric energy and controls circuits through smart meters, circuit breakers, contactors and other equipment;

[0029] 3) Charging pile module 1: connected to the electric vehicle to perform charging operations;

[0030] 4) Energy storage module 3: stores electricity when the grid is low or has excess power, and supplies power to the charging pile when needed;

[0031] 5) Monitoring and management platform: real-time monitoring of the status of charging pile module 1, energy storage module 3, and power distribution module 2, and issuing control instructions;

[0032] 6) End: The system runs normally or stops abnormally;

[0033] like Figure 2 As shown, the charging control process is as follows:

[0034] 1) Start: The charging pile is connected to the electric vehicle;

[0035] 2) Detection vehicle unit 5: The charging controller of the charging pile detects the charging demand and status of the electric vehicle, such as battery voltage, current power, and maximum charging current;

[0036] 3) Parameter adjustment unit 6: the charging controller adjusts the operating parameters of the power conversion circuit according to the detected vehicle demand;

[0037] 4) Constant current charging unit 7: The power conversion circuit charges the electric vehicle with a constant current;

[0038] 5) Voltage detection unit 8: monitors the battery voltage in real time and determines whether the battery voltage reaches the set constant voltage value. If yes, it enters the constant voltage charging stage, otherwise it continues the constant current charging;

[0039] 6) Constant voltage charging unit 8: The power conversion circuit charges the electric vehicle at a constant voltage, and monitors the charging current to determine whether the charging current drops to the set end value. If so, charging is stopped, otherwise constant voltage charging continues;

[0040] 7) Abnormality detection unit 11: During the charging process, the voltage and current are continuously monitored in real time to see if they are abnormal. If an abnormality is detected, charging is stopped and an alarm is sounded, and the process ends; if no abnormality is detected, the charging process continues;

[0041] like Figure 3 As shown, the energy storage charging and discharging control process is as follows:

[0042] 1) Start: system operation;

[0043] 2) Calibration unit 12: If it is in the off-peak electricity price period and the SOC of the energy storage module 3 is low, the platform instructs the energy storage module 3 to charge from the grid; if it is in the off-peak electricity price period and the SOC of the energy storage module 3 is low, the platform instructs the energy storage module 3 to charge from the grid;

[0044] 3) BMS monitoring unit 13: BMS monitors battery status, such as voltage, current, and temperature;

[0045] 4) The bidirectional DC-AC converter 14 works: According to the BMS feedback and platform instructions, the bidirectional DC-AC converter 14 controls the charging current and voltage to charge the battery pack;

[0046] 5) Charging completed: When the 3SOC of the energy storage module reaches the set value, charging stops;

[0047] 6) Discharge power control unit 15: If it is at a peak power consumption or a power grid failure, the monitoring platform instructs the energy storage module 3 to discharge to supply power to the charging pile. The monitoring platform controls the discharge power of the bidirectional DC-AC converter 14 according to the demand of the charging pile and the battery power;

[0048] 7) End: The discharge is completed or the system stops, and the process ends.

[0049] Although the embodiments of the present invention have been shown and described, it is understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents. In short, if those skilled in the art are inspired by them and design structural modes and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A control system for an energy storage charging pile system, characterized in that: The invention comprises a charging pile module, a power distribution module (2), an energy storage module (3) and a monitoring and management platform (4); one end of the power distribution module (2) is connected to a power grid; the power distribution module (2) comprises a smart meter, a circuit breaker and a contactor; the other end of the power distribution module (2) is electrically connected to the charging pile module and the energy storage module (3) via wires; and the monitoring and management platform (4) is electrically connected to the charging pile module, the power distribution module (2) and the energy storage module (3) via wires.

2. The energy storage charging pile system control system according to claim 1, characterized in that: The charging pile module comprises a vehicle detection unit (5), a parameter adjustment unit (6), a constant current charging unit (7), a voltage detection unit (8), a constant voltage charging unit (9) and a current detection unit (10); the vehicle detection unit (5), the parameter adjustment unit (6), the constant current charging unit (7), the voltage detection unit (8), the constant voltage charging unit (9) and the current detection unit (10) are sequentially connected in series to a main circuit; the voltage detection unit (8) and the current detection unit (10) are respectively connected in parallel with an abnormality detection unit (11); the other end of the abnormality detection unit (11) is electrically connected to a main circuit switch.

3. The energy storage charging pile system control system according to claim 2 is characterized in that: The energy storage module (3) comprises a calibration unit (12), a BMS monitoring unit (13), a bidirectional DC-AC converter (14) and a discharge power control unit (15); the calibration unit (12) comprises an interface 1, an interface 2 and an interface 3; the interface 1 is connected to power grid; the interface 2 is connected in series to the BMS monitoring unit (13) and the bidirectional DC-AC converter (14); and the interface 3 is connected to power of the discharge power control unit (15) via a wire.

4. The energy storage charging pile system control system according to claim 3 is characterized in that: The vehicle detection unit (5) comprises an identification module and a data processing module, and the data processing module is connected to a large vehicle information database.

5. The energy storage charging pile system control system according to claim 4 is characterized in that: The calibration unit (12) accesses and determines the real-time data of high and low valleys of the power grid.

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