Light storage charging and discharging integrated charging pile energy management method based on low-speed communication

Abstract

The invention provides a light storage charging and discharging integrated charging pile energy management method based on low-speed communication. The method comprises the steps that a bus voltage threshold value is divided into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area and preset to local control of all converters; receiving scheduling information from an upper-layer power grid, processing the information according to a corresponding energy optimization algorithm to obtain an optimal control parameter, and determining a charging and discharging operation mode of the charging and discharging converter unit; respectively sending the optimal control parameters to the corresponding photovoltaic converter unit, the energy storage converter unit and the grid-connected converter unit; voltage information of a local output port is detected through the photovoltaic converter unit and the energy storage converter unit, and voltage information of a local input port is detected through the grid-connected converter unit; respective operation modes are adaptively switched according to a preset working rule, the power balance in the optical storage charging and discharging integrated charging pile system is controlled, and the operation reliability and safety of the optical storage charging and discharging integrated charging pile are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicle charging, and in particular to an energy management method for a charging pile integrating light storage, charging and discharging based on low-speed communication. Background Art

[0002] In recent years, electric vehicles have gradually replaced fuel vehicles in private cars, and charging piles, as the most basic supporting facilities for electric vehicles, are of great significance for their safe and stable operation. Common new energy charging piles combine photovoltaic power generation with energy storage units, generate electricity through solar photovoltaic panels, store excess electricity in the energy storage system and feed it back to the power grid through inverters. When electricity demand increases or solar power generation is insufficient, the stored electricity can be used to supply electricity. This combination of photovoltaic and storage can not only alleviate the impact of a large number of electric vehicles on the power grid when charging, reduce dependence on power grid electricity, and to a certain extent alleviate the power supply pressure of the power grid, improve the utilization rate of new energy and the self-sufficiency of the system, but also reduce electricity bills, improve economic benefits, and reduce carbon emissions during the operation of charging stations.

[0003] However, in actual applications, current new energy charging piles mainly rely on energy storage units as a means to smooth out power fluctuations within the system. This requires full consideration of user needs and grid needs when configuring energy storage capacity, which can easily lead to waste of energy storage capacity and reduction of battery life. In addition, current integrated photovoltaic storage and charging piles mostly use energy management devices that require high-speed communication to control the operating modes of multiple units, which places extremely high demands on the reliability and stability of communication. When the upper-level energy management device or communication unit fails, it can easily cause control disorder of the charging pile system and make it impossible to operate safely and stably.

[0004] Therefore, how to improve the safety of charging pile operation has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0005] The present invention provides an energy management method for a charging pile with integrated light storage and charging and discharging based on low-speed communication, so as to solve the defects of poor operating safety and reliability of charging piles in the prior art.

[0006] In a first aspect, the present invention provides a method for managing energy of a charging pile with integrated light storage and charging and discharging based on low-speed communication, comprising:

[0007] The bus voltage threshold is divided into photovoltaic control layer area, energy storage control layer area and grid-connected control layer area and preset into the local control of each converter;

[0008] The energy control device receives the dispatch information from the upper power grid and processes the information according to the corresponding energy optimization algorithm to obtain the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and determines the charge and discharge operation mode of the charge and discharge converter unit;

[0009] The optimal control parameters are respectively sent to the corresponding photovoltaic converter unit, energy storage converter unit and grid-connected converter unit through the energy control device;

[0010] Detecting voltage information of a local output port through the photovoltaic converter unit and the energy storage converter unit, and detecting voltage information of a local input port through the grid-connected converter unit;

[0011] Based on the voltage information of the local output port and the voltage information of the local input port, the respective operating modes are adaptively switched according to pre-set working rules to control the power balance in the integrated photovoltaic storage charging and discharging charging pile system.

[0012] According to a method for energy management of a photovoltaic storage charging and discharging integrated charging pile based on low-speed communication provided by the present invention, the bus voltage threshold is divided into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area, including:

[0013] Determine the allowed voltage fluctuation threshold of the charging pile;

[0014] Based on the voltage fluctuation threshold, the photovoltaic control layer area, the energy storage control layer area and the grid-connected control layer area are determined, wherein the voltage threshold of the photovoltaic control layer area is higher than the voltage threshold of the energy storage control layer area and the grid-connected control layer area, and the voltage threshold range of the energy storage control layer area and the grid-connected control layer area is determined according to different control objectives.

[0015] According to a method for managing an integrated photovoltaic charging pile based on low-speed communication provided by the present invention, the voltage information of the local output port and the voltage information of the local input port are adaptively switched to respective operation modes according to a preset working rule, including:

[0016] Detecting whether the output port voltage is in the photovoltaic control layer area by the photovoltaic converter unit;

[0017] If it is, the droop control mode is executed; if it is not, the MPPT control mode is executed.

[0018] According to a method for managing an integrated photovoltaic charging pile based on low-speed communication provided by the present invention, the voltage information of the local output port and the voltage information of the local input port are adaptively switched to respective operation modes according to a preset working rule, including:

[0019] Detecting the output port voltage and the energy storage battery SOC through the energy storage converter unit;

[0020] If the output port voltage is within the energy storage control layer region, determining whether it is in a charging state;

[0021] If it is in the charging state, determining whether the SOC of the energy storage battery is greater than 90%, if so, shutting down, if not, executing the droop charging mode;

[0022] If it is not in the charging state, it is determined whether the SOC of the energy storage battery is less than 20%. If it is less than 20%, the machine is shut down; if it is not less than 20%, a droop discharge mode is executed.

[0023] According to the present invention, a method for managing energy of a charging pile with integrated light storage and charging and discharging based on low-speed communication also includes:

[0024] If the output port voltage is not within the energy storage control layer region, determining whether it is in a charging state;

[0025] If it is in the charging state, determine whether the SOC of the energy storage battery is greater than 90%, if it is greater, shut down, if not, execute the constant current charging mode;

[0026] If it is not in the charging state, it is determined whether the SOC of the energy storage battery is less than 20%. If it is less than 20%, the system is shut down; if it is not less than 20%, a constant current discharge mode is executed.

[0027] According to a method for managing an integrated photovoltaic charging pile based on low-speed communication provided by the present invention, the voltage information of the local output port and the voltage information of the local input port are adaptively switched to respective operation modes according to a preset working rule, including:

[0028] Detecting the output port voltage through the grid-connected converter unit;

[0029] Determine whether the output port voltage is within the grid-connected control layer region, if so, execute a droop control mode, if not, execute a maximum power control mode.

[0030] According to a method for managing an integrated photovoltaic charging pile based on low-speed communication provided by the present invention, the voltage information of the local output port and the voltage information of the local input port are adaptively switched to respective operation modes according to a preset working rule, including:

[0031] The charge and discharge operation mode is controlled by the charge and discharge converter unit according to the instruction of the energy management unit.

[0032] According to a method for energy management of an integrated charging pile of light storage and charging and discharging based on low-speed communication provided by the present invention, the energy control device comprises:

[0033] The information receiving module is used to receive the dispatching instructions of the AC power grid, establish a communication connection with the upper power grid dispatching center, and obtain the current power grid power consumption and electricity price information;

[0034] An information processing module executes an optimization algorithm according to the information received by the information receiving module, calculates the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and schedules the charging and discharging mode of the charging and discharging converter unit;

[0035] The instruction sending module is used to send the optimal control parameters to the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, control the integrated photovoltaic storage charging and discharging charging pile to cooperate with the upper power grid regulation to maintain the optimal operating state; and is also used to send charging and discharging instructions to the charging and discharging converter unit to control the charging and discharging converter unit to have V2G function.

[0036] According to a method for energy management of an integrated photoelectric storage charging and discharging charging pile based on low-speed communication provided by the present invention, the energy management device is applied to an energy management unit of the integrated photoelectric storage charging and discharging charging pile based on low-speed communication, and the integrated photoelectric storage charging and discharging charging pile based on low-speed communication further includes: a photovoltaic cell, a photovoltaic converter unit, an energy storage battery, an energy storage converter unit, a grid-connected converter unit, and a charge and discharge converter unit;

[0037] The input end of the photovoltaic converter unit is connected to the photovoltaic cell, and the output end is connected to the DC bus of the photovoltaic storage charging and discharging integrated charging pile;

[0038] The energy storage converter unit has an input end connected to an energy storage battery, and an output end connected to a DC bus of a photovoltaic storage charging and discharging integrated charging pile;

[0039] The input end of the grid-connected converter unit is connected to the DC bus of the photovoltaic storage charging and discharging integrated charging pile, and the output end is connected to the AC power grid;

[0040] The input end of the charging and discharging converter unit is connected to the DC bus of the photovoltaic storage charging and discharging integrated charging pile, and the output end is used to connect to the power battery of the electric vehicle;

[0041] The energy control unit establishes low-speed communication with the photovoltaic converter unit, the energy storage converter unit, the grid-connected converter unit and the charge-discharge converter unit, and the energy control unit is configured with an interactive interface for exchanging information with an upper-level dispatching center.

[0042] According to a method for energy management of an integrated photovoltaic storage charging and discharging charging pile based on low-speed communication provided by the present invention, the photovoltaic converter unit is a unidirectional Boost converter, the energy storage converter unit is a bidirectional DC / DC converter, the grid-connected converter unit is a bidirectional DC / AC converter, and the charging and discharging converter unit is a CLLLC converter.

[0043] In a second aspect, the present invention further provides a light storage charging and discharging integrated charging pile energy management device based on low-speed communication, comprising:

[0044] A division module, used to divide the bus voltage threshold into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area and preset them into the local control of each converter;

[0045] A determination module is used to receive the dispatch information from the upper power grid through the energy control device and process the information according to the corresponding energy optimization algorithm to obtain the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and determine the charge and discharge operation mode of the charge and discharge converter unit;

[0046] A sending module, used to send the optimal control parameters to the corresponding photovoltaic converter unit, energy storage converter unit and grid-connected converter unit respectively through the energy control device;

[0047] An operation module is used to detect the voltage information of the local output port through the photovoltaic converter unit and the energy storage converter unit, and detect the voltage information of the local input port through the grid-connected converter unit; based on the voltage information of the local output port and the voltage information of the local input port, adaptively switch the respective operation modes according to pre-set working rules to control the power balance in the integrated photovoltaic storage charging and discharging charging pile system.

[0048] In a third aspect, the present invention further provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, an energy management method for an integrated photoelectric storage and charging pile based on low-speed communication as described above is implemented.

[0049] In a fourth aspect, the present invention further provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements an energy management method for an integrated photovoltaic storage and charging pile based on low-speed communication as described in any one of the above.

[0050] In a fifth aspect, the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements any of the above-mentioned methods for managing the energy of an integrated photovoltaic storage and charging pile based on low-speed communication.

[0051] The present invention provides an energy management method for an integrated photovoltaic, storage and charging pile based on low-speed communication, comprising dividing the bus voltage threshold into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area and presetting them in the local control of each converter; receiving scheduling information from an upper power grid through an energy control device and processing the information according to a corresponding energy optimization algorithm to obtain optimal control parameters of a photovoltaic converter unit, an energy storage converter unit and a grid-connected converter unit, and determining the charging and discharging operation mode of the charging and discharging converter unit; sending the optimal control parameters to the corresponding photovoltaic converter unit, energy storage converter unit and grid-connected converter unit respectively through the energy control device; detecting the voltage information of the local output port through the photovoltaic converter unit and the energy storage converter unit, and detecting the voltage information of the local input port through the grid-connected converter unit; based on the voltage information of the local output port and the voltage information of the local input port, adaptively switching the respective operation modes according to pre-set working rules to control the power balance in the integrated photovoltaic, storage and charging pile system. The operating mode can be switched autonomously only by detecting the local port voltage information, and in each mode there is a unit responsible for supporting the DC bus voltage in the integrated photovoltaic storage and charging pile system, without the need for coordination through the energy management device. This enables energy management of the integrated photovoltaic storage and charging pile under low-speed communication, reduces the requirements of the charging pile for the communication system, and can also maintain autonomous operation for a certain period of time, thereby improving the operating reliability and safety of the integrated photovoltaic storage and charging pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0053] Figure 1 This is one of the flow charts of the energy management method of the integrated photoelectric storage charging and discharging charging pile based on low-speed communication provided in this embodiment;

[0054] Figure 2 This is the second flow chart of the energy management method for an integrated photovoltaic storage and charging pile based on low-speed communication provided in this embodiment.

[0055] Figure 3 is a schematic diagram of the structure of the energy control device provided in this embodiment;

[0056] Figure 4 This is a circuit diagram of a photovoltaic storage charging and discharging integrated charging pile system provided in this embodiment;

[0057] Figure 5It is a schematic diagram of the structure of the photovoltaic storage charging and discharging integrated charging pile system provided in this embodiment;

[0058] Figure 6 It is a schematic diagram of the structure of the electronic device provided in this embodiment. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] Figure 1 This is one of the flow charts of the energy management method of the integrated photoelectric storage charging and discharging charging pile based on low-speed communication provided in this embodiment. Figure 2 This is the second flow chart of the energy management method for an integrated photovoltaic storage and charging pile based on low-speed communication provided in this embodiment.

[0061] like Figure 1 As shown, the energy management method of the integrated photoelectric storage charging and discharging charging pile based on low-speed communication provided by the embodiment of the present invention mainly includes the following steps:

[0062] 101. The bus voltage threshold is divided into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area and preset in the local control of each converter.

[0063] In a specific implementation process, the integrated photovoltaic storage charging and discharging charging pile system includes: a photovoltaic cell, a photovoltaic converter unit, an energy storage battery, an energy storage converter unit, a grid-connected converter unit and a charging and discharging converter unit; the input end of the photovoltaic converter unit is connected to the photovoltaic cell, and the output end is connected to the DC bus of the integrated photovoltaic storage charging and discharging charging pile; the input end of the energy storage converter unit is connected to the energy storage battery, and the output end is connected to the DC bus of the integrated photovoltaic storage charging and discharging charging pile; the input end of the grid-connected converter unit is connected to the DC bus of the integrated photovoltaic storage charging and discharging charging pile, and the output end is connected to the AC power grid; the input end of the charging and discharging converter unit is connected to the DC bus of the integrated photovoltaic storage charging and discharging charging pile, and the output end is used to connect to the electric vehicle power battery; the energy control unit establishes low-speed communication with the photovoltaic converter unit, the energy storage converter unit, the grid-connected converter unit and the charging and discharging converter unit, and the energy control unit is configured with an interactive interface for exchanging information with the upper-level dispatching center.

[0064] Based on the integrated photovoltaic, storage and charging and discharging charging pile system, the allowable voltage fluctuation threshold inside the charging pile is determined, and it is divided into photovoltaic control layer area, energy storage control layer area and grid-connected control layer area according to the allowable bus voltage fluctuation threshold. The upper and lower limits of the voltage of the three layers are preset to the corresponding photovoltaic converter unit, energy storage converter unit and grid-connected converter unit respectively.

[0065] In order to maximize the efficiency of renewable energy power generation, the threshold of the photovoltaic control layer is usually higher than that of the other two control layers. The threshold ranges of the energy storage control layer and the grid-connected control layer vary depending on the control objectives.

[0066] 102. Receive dispatch information from the upper power grid through the energy control device and process the information according to the corresponding energy optimization algorithm to obtain the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and determine the charge and discharge operation mode of the charge and discharge converter unit.

[0067] Among them, the maximum current limit set in the optimal control parameters cannot exceed the power limit of the converter itself. Usually, the photovoltaic converter unit and the energy storage converter unit use the maximum operating power of their own converter as the upper limit. The grid-connected converter unit needs to be set in combination with the maximum operating power of the converter and the grid dispatching instructions. In addition, if there are no specific requirements, the charging and discharging converter unit defaults to the discharge mode to the electric vehicle power battery.

[0068] 103. Send optimal control parameters to corresponding photovoltaic converter units, energy storage converter units and grid-connected converter units respectively through the energy control device.

[0069] In addition to sending the optimal control parameters to the corresponding photovoltaic converter unit, energy storage converter unit and grid-connected converter unit, it also includes sending control instructions to better achieve respective control. And the communication requirements during data transmission are only low-speed communication requirements.

[0070] 104. Detect voltage information of a local output port through a photovoltaic converter unit and an energy storage converter unit, and detect voltage information of a local input port through a grid-connected converter unit.

[0071] Each converter unit only needs to detect the local port information to determine the operating mode, without communicating with other units or communicating with the energy control device at high speed. Therefore, the voltage information of the local output port and input port affects the different operating modes. The way to detect voltage information can be a voltage sensor, which is installed at the output port or input port to detect the voltage in real time. It can be an analog-to-digital converter (ADC): converting the analog signal collected by the voltage sensor into a digital signal. The control chip in the converter unit reads the voltage data through the ADC, processes the digital signal collected by the ADC, and calculates the voltage value. It realizes functions such as voltage regulation and power control.

[0072] 105. Based on the voltage information of the local output port and the voltage information of the local input port, the respective operation modes are adaptively switched according to the pre-set working rules to control the power balance in the integrated photovoltaic storage charging and discharging charging pile system.

[0073] Each converter unit switches to various operation modes according to the received control parameters, without communicating with other units or high-speed communication with energy control devices. Among them, the photovoltaic converter unit has two operation modes: MPPT and droop discharge; the energy storage converter unit has four operation modes: constant current discharge, droop discharge, constant current charging, and droop charging. Constant current charging and discharging are all performed at their maximum charge and discharge current. In addition, when the SOC of the energy storage battery exceeds the upper and lower limits of the allowed SOC operation, the energy storage converter unit needs to stop running to avoid overcharging and over-discharging of the battery; the grid-connected converter unit has four operation modes: constant current discharge, droop discharge, constant current charging, and droop charging. Constant current charging and discharging are all performed at their maximum charge and discharge current.

[0074] Specifically, Figure 2 As shown, S1, S2 and S3 are Figure 1 101, 102 and 103 correspond to each other. The photovoltaic converter unit detects whether the output port voltage is in the photovoltaic control layer area; if so, the droop control mode is executed, and if not, the MPPT control mode is executed.

[0075] The output port voltage and the energy storage battery SOC are detected by the energy storage converter unit; if the output port voltage is within the energy storage control layer area, it is determined whether it is in a charging state; if it is in a charging state, it is determined whether the energy storage battery SOC is greater than 90%, if it is greater, it is shut down, if it is not greater, a droop charging mode is executed; if it is not in a charging state, it is determined whether the energy storage battery SOC is less than 20%, if it is less, it is shut down, if it is not less than, a droop discharge mode is executed. If the output port voltage is not within the energy storage control layer area, it is determined whether it is in a charging state; if it is in a charging state, it is determined whether the energy storage battery SOC is greater than 90%, if it is greater, it is shut down, if it is not greater, a constant current charging mode is executed; if it is not in a charging state, it is determined whether the energy storage battery SOC is less than 20%, if it is less, it is shut down, if it is not less than, a constant current discharge mode is executed.

[0076] The output port voltage is detected by the grid-connected converter unit; it is determined whether the output port voltage is within the grid-connected control layer area, if so, the droop control mode is executed, if not, the maximum power control mode is executed.

[0077] The charge and discharge operation mode is controlled by the charge and discharge converter unit according to the instruction of the energy management unit.

[0078] Furthermore, if Figure 3 As shown, the energy control device in this embodiment includes:

[0079] The information receiving module is used to receive the dispatching instructions of the AC power grid, establish a communication connection with the upper power grid dispatching center, and obtain the current power grid power consumption and electricity price information;

[0080] The information processing module executes the optimization algorithm according to the information received by the information receiving module, calculates the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and schedules the charging and discharging mode of the charging and discharging converter unit;

[0081] The instruction sending module is used to send optimal control parameters to the photovoltaic converter unit, energy storage converter unit, and grid-connected converter unit, control the integrated photovoltaic storage charging and discharging charging pile to cooperate with the upper power grid regulation and control to maintain the optimal operating state; it is also used to send charging and discharging instructions to the charging and discharging converter unit to control the charging and discharging converter unit to have V2G function.

[0082] Furthermore, if Figure 4 As shown, the photovoltaic converter unit is a unidirectional Boost converter, the energy storage converter unit is a bidirectional DC / DC converter, the grid-connected converter unit is a bidirectional DC / AC converter, and the charge-discharge converter unit is a CLLLC converter. Figure 5 The figure shows the structure diagram of the integrated photovoltaic storage and charging and discharging charging pile system.

[0083] The present invention integrates the four ports of photovoltaic, energy storage, grid connection, and charging and discharging, and designs it into a photovoltaic storage charging and discharging integrated charging pile. Through the designed energy control method, the photovoltaic, energy storage, and grid connection units only need to detect the local port voltage information to switch the operation mode autonomously, and in each mode, there is a unit that bears the responsibility of supporting the DC bus voltage in the photovoltaic storage charging and discharging integrated charging pile system, without the need for coordination through the energy management device, so that the energy management of the photovoltaic storage charging and discharging integrated charging pile can be completed under low-speed communication, reducing the requirements of the charging pile on the communication system, and when the energy management unit or the intermediate communication fails, it can also maintain autonomous operation for a certain period of time, thereby improving the reliability and safety of the photovoltaic storage charging and discharging integrated charging pile operation; the energy management device provides a port for receiving upper-level power grid information, and the optimal control parameters are obtained according to the intelligent algorithm preset in the energy management device in advance, which is convenient for accepting the upper-level power grid energy dispatching and realizing higher-level energy management and optimization functions; in addition, the V2G function is applied to the charging pile, so that the electric vehicle power battery can also be used as an energy storage battery, and provide electric energy to the power grid when necessary, so as to achieve energy saving, environmental protection and electricity reduction, and have certain economic benefits.

[0084] Figure 6 It is a schematic diagram of the structure of the electronic device provided in this embodiment.

[0085] like Figure 6 As shown, the electronic device may include: a processor (processor) 610, a communication interface (Communications Interface) 620, a memory (memory) 630 and a communication bus 640, wherein the processor 610, the communication interface 620, and the memory 630 communicate with each other through the communication bus 640. The processor 610 can call the logic instructions in the memory 630 to execute the energy management method of the photovoltaic storage charging and discharging integrated charging pile based on low-speed communication, the method comprising: dividing the bus voltage threshold into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area and presetting it in the local control of each converter; receiving the dispatch information from the upper power grid through the energy control device and processing the information according to the corresponding energy optimization algorithm to obtain the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and determine the charging and discharging operation mode of the charging and discharging converter unit; sending the optimal control parameters to the corresponding photovoltaic converter unit, the energy storage converter unit and the grid-connected converter unit respectively through the energy control device; detecting the voltage information of the local output port through the photovoltaic converter unit and the energy storage converter unit, and detecting the voltage information of the local input port through the grid-connected converter unit; based on the voltage information of the local output port and the voltage information of the local input port, adaptively switching the respective operation modes according to the preset working rules to control the power balance in the photovoltaic storage charging and discharging integrated charging pile system.

[0086] In addition, the logic instructions in the above-mentioned memory 630 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0087] On the other hand, the present invention also provides a computer program product, which includes a computer program. The computer program can be stored on a non-transitory computer-readable storage medium. When the computer program is executed by a processor, the computer can execute the energy management method of the photovoltaic storage charging and discharging integrated charging pile based on low-speed communication provided by the above methods. The method includes: dividing the bus voltage threshold into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area and presetting it in the local control of each converter; receiving the dispatching information from the upper power grid through the energy control device and processing the information according to the corresponding energy optimization algorithm to obtain the photovoltaic converter unit, the energy storage converter unit The optimal control parameters of the photovoltaic unit and the grid-connected converter unit are determined, and the charging and discharging operation mode of the charging and discharging converter unit is determined; the optimal control parameters are respectively sent to the corresponding photovoltaic converter unit, the energy storage converter unit and the grid-connected converter unit through the energy control device; the voltage information of the local output port is detected through the photovoltaic converter unit and the energy storage converter unit, and the voltage information of the local input port is detected through the grid-connected converter unit; based on the voltage information of the local output port and the voltage information of the local input port, the respective operation modes are adaptively switched according to the pre-set working rules to control the power balance in the photovoltaic storage charging and discharging integrated charging pile system.

[0088] On the other hand, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which is implemented when the computer program is executed by the processor to execute the energy management method of the photovoltaic storage charging and discharging integrated charging pile based on low-speed communication provided by the above methods, the method comprising: dividing the bus voltage threshold into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area and presetting it in the local control of each converter; receiving the dispatching information from the upper power grid through the energy control device and processing the information according to the corresponding energy optimization algorithm to obtain the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit and the grid-connected converter unit. number, and determine the charging and discharging operation mode of the charging and discharging converter unit; send the optimal control parameters to the corresponding photovoltaic converter unit, energy storage converter unit and grid-connected converter unit respectively through the energy control device; detect the voltage information of the local output port through the photovoltaic converter unit and the energy storage converter unit, and detect the voltage information of the local input port through the grid-connected converter unit; based on the voltage information of the local output port and the voltage information of the local input port, adaptively switch the respective operation modes according to the pre-set working rules to control the power balance in the photovoltaic storage charging and discharging integrated charging pile system.

[0089] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0090] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for energy management of a charging pile with integrated light storage and charging and discharging based on low-speed communication, characterized in that: include: The bus voltage threshold is divided into photovoltaic control layer area, energy storage control layer area and grid-connected control layer area and preset into the local control of each converter; The energy control device receives the dispatch information from the upper power grid and processes the information according to the corresponding energy optimization algorithm to obtain the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and determines the charge and discharge operation mode of the charge and discharge converter unit; The optimal control parameters are respectively sent to the corresponding photovoltaic converter unit, energy storage converter unit and grid-connected converter unit through the energy control device; Detecting voltage information of a local output port through the photovoltaic converter unit and the energy storage converter unit, and detecting voltage information of a local input port through the grid-connected converter unit; Based on the voltage information of the local output port and the voltage information of the local input port, the respective operating modes are adaptively switched according to pre-set working rules to control the power balance in the integrated photovoltaic storage charging and discharging charging pile system.

2. The method for managing the energy of a charging pile based on low-speed communication of light storage and charging and discharging is characterized in that: The bus voltage threshold is divided into a photovoltaic control layer area, an energy storage control layer area and a grid-connected control layer area, including: Determine the allowed voltage fluctuation threshold of the charging pile; Based on the voltage fluctuation threshold, the photovoltaic control layer area, the energy storage control layer area and the grid-connected control layer area are determined, wherein the voltage threshold of the photovoltaic control layer area is higher than the voltage threshold of the energy storage control layer area and the grid-connected control layer area, and the voltage threshold range of the energy storage control layer area and the grid-connected control layer area is determined according to different control objectives.

3. The method for managing the energy of a charging pile based on low-speed communication and integrated light storage and charging and discharging according to claim 1 is characterized in that: The step of adaptively switching respective operation modes based on the voltage information of the local output port and the voltage information of the local input port according to a preset working rule includes: Detecting whether the output port voltage is in the photovoltaic control layer area by the photovoltaic converter unit; If it is, the droop control mode is executed; if it is not, the MPPT control mode is executed.

4. The method for managing the energy of a charging pile based on low-speed communication of light storage and charging and discharging integration according to claim 1 is characterized in that: The step of adaptively switching respective operation modes based on the voltage information of the local output port and the voltage information of the local input port according to a preset working rule includes: Detecting the output port voltage and the energy storage battery SOC through the energy storage converter unit; If the output port voltage is within the energy storage control layer region, determining whether it is in a charging state; If it is in the charging state, determining whether the SOC of the energy storage battery is greater than 90%, if so, shutting down, if not, executing the droop charging mode; If it is not in the charging state, it is determined whether the SOC of the energy storage battery is less than 20%. If it is less than 20%, the machine is shut down; if it is not less than 20%, a droop discharge mode is executed.

5. The method for managing the energy of a charging pile based on low-speed communication of light storage and charging and discharging integration according to claim 4 is characterized in that: Also includes: If the output port voltage is not within the energy storage control layer region, determining whether it is in a charging state; If it is in the charging state, determine whether the SOC of the energy storage battery is greater than 90%, if it is greater, shut down, if not, execute the constant current charging mode; If it is not in the charging state, it is determined whether the SOC of the energy storage battery is less than 20%. If it is less than 20%, the system is shut down; if it is not less than 20%, a constant current discharge mode is executed.

6. The method for managing the energy of a charging pile based on low-speed communication and integrated light storage and charging and discharging according to claim 1 is characterized in that: The step of adaptively switching respective operation modes based on the voltage information of the local output port and the voltage information of the local input port according to a preset working rule includes: Detecting the output port voltage through the grid-connected converter unit; Determine whether the output port voltage is within the grid-connected control layer region, if so, execute a droop control mode, if not, execute a maximum power control mode.

7. The method for managing the energy of a charging pile based on low-speed communication and integrated light storage and charging and discharging according to claim 1 is characterized in that: The step of adaptively switching respective operation modes based on the voltage information of the local output port and the voltage information of the local input port according to a preset working rule includes: The charge and discharge operation mode is controlled by the charge and discharge converter unit according to the instruction of the energy management unit.

8. The method for managing energy of a charging pile based on low-speed communication integrated with light storage and charging and discharging according to any one of claims 1 to 7, characterized in that: The energy control device comprises: The information receiving module is used to receive the dispatching instructions of the AC power grid, establish a communication connection with the upper power grid dispatching center, and obtain the current power grid power consumption and electricity price information; An information processing module executes an optimization algorithm according to the information received by the information receiving module, calculates the optimal control parameters of the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, and schedules the charging and discharging mode of the charging and discharging converter unit; The instruction sending module is used to send the optimal control parameters to the photovoltaic converter unit, the energy storage converter unit, and the grid-connected converter unit, control the integrated photovoltaic storage charging and discharging charging pile to cooperate with the upper power grid regulation to maintain the optimal operating state; and is also used to send charging and discharging instructions to the charging and discharging converter unit to control the charging and discharging converter unit to have V2G function.

9. The method for managing the energy of a charging pile based on low-speed communication of light storage and charging and discharging integration according to claim 8 is characterized in that: The energy management device is applied to the energy management unit of the light-storage-charge-discharge integrated charging pile based on low-speed communication, and the light-storage-charge-discharge integrated charging pile based on low-speed communication also includes: a photovoltaic cell, a photovoltaic converter unit, an energy storage battery, an energy storage converter unit, a grid-connected converter unit and a charge-discharge converter unit; The input end of the photovoltaic converter unit is connected to the photovoltaic cell, and the output end is connected to the DC bus of the photovoltaic storage charging and discharging integrated charging pile; The energy storage converter unit has an input end connected to an energy storage battery, and an output end connected to a DC bus of a photovoltaic storage charging and discharging integrated charging pile; The input end of the grid-connected converter unit is connected to the DC bus of the photovoltaic storage charging and discharging integrated charging pile, and the output end is connected to the AC power grid; The input end of the charging and discharging converter unit is connected to the DC bus of the photovoltaic storage charging and discharging integrated charging pile, and the output end is used to connect to the power battery of the electric vehicle; The energy control unit establishes low-speed communication with the photovoltaic converter unit, the energy storage converter unit, the grid-connected converter unit and the charge-discharge converter unit, and the energy control unit is configured with an interactive interface for exchanging information with an upper-level dispatching center.

10. The method for managing the energy of a charging pile with integrated light storage and charging and discharging based on low-speed communication according to any one of claims 1 to 7, characterized in that: The photovoltaic converter unit is a unidirectional Boost converter, the energy storage converter unit is a bidirectional DC / DC converter, the grid-connected converter unit is a bidirectional DC / AC converter, and the charge-discharge converter unit is a CLLLC converter.

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