A method and system for coordinated control of photovoltaic storage charging and discharging integrated machine on and off the grid

Abstract

The present invention discloses a photovoltaic storage charging and discharging integrated machine and off-grid coordinated control method and system, the method includes: drawing a power generation curve according to meteorological data; when no vehicle is charging, charging the energy storage device; when it is detected that the vehicle is in normal charging mode, charging the vehicle through the power generation device, and performing power compensation through the energy storage device; when the charging mode is a fast charging mode, determining the fast charging time interval, calculating the first stable power supply power of the power generation device, the second stable power supply power of the energy storage device and the third stable power supply power of the power grid, and distributing the charging power to the vehicle; when the power grid fails or the power is cut off, controlling the photovoltaic storage charging and discharging integrated machine to enter an off-grid state, and starting the emergency energy storage module in the energy storage device to supply power. The present invention controls the power generation device, the energy storage device and the power grid to supply power to the vehicle according to the rated power, thereby reducing the system data processing pressure and reducing the impact of charging power fluctuations on the vehicle battery.

Description

Technical Field

[0001] The present application relates to the field of energy storage control technology, and more specifically, to a method and system for coordinated control of an integrated photovoltaic storage and charging / discharging device and off-grid coordination. Background Art

[0002] With the popularization of new energy vehicles and the development of renewable energy, the integrated photovoltaic storage and charging system has gradually become an important way to solve the contradiction between energy supply and demand and promote green travel. The integrated photovoltaic storage and charging solution is an energy solution that integrates photovoltaic power generation, energy storage, and vehicle charging and supports each other in a coordinated manner. However, existing photovoltaic storage and charging systems often have problems such as insufficient energy utilization and inflexible grid control, making it difficult to meet complex and changing energy needs.

[0003] Therefore, the prior art has defects and is in urgent need of improvement. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a method and system for off-grid coordinated control of a photovoltaic storage charging and discharging integrated machine, which controls the power generation device, energy storage device and power grid to supply power to the vehicle according to the rated power, thereby reducing the system data processing pressure and reducing the impact of charging power fluctuations on the vehicle battery.

[0005] The first aspect of the present invention provides a method for coordinated control of a photovoltaic storage charging and discharging integrated device and an off-grid coordinated control method, comprising: When the photovoltaic storage charging and discharging integrated device is connected to the grid, meteorological data is obtained; Analyze the meteorological data and draw a power generation curve; When no vehicle is being charged, charging one or more energy storage modules in the energy storage device according to the power generation curve; When it is detected that the vehicle is being charged, charging is performed according to the charging mode selected by the user; the charging mode includes a normal charging mode and a fast charging mode; When the charging mode is the normal charging mode, the vehicle is charged by the power generation device first, and the power is compensated by the energy storage device. When the power generation device does not meet the vehicle charging conditions, the vehicle is charged by the energy storage device; When the charging mode is the fast charging mode, multiple groups of fast charging time intervals are determined according to preset time intervals, and the first stable power supply power of the power generation device, the second stable power supply power of the energy storage device and the third stable power supply power of the power grid in each group of fast charging time intervals are calculated respectively, and the charging power is allocated to the vehicle according to each fast charging time interval; When the grid fails or there is a power outage, the photovoltaic storage charging and discharging integrated machine is controlled to enter an off-grid state, and the emergency energy storage module in the energy storage device is started to supply power.

[0006] In this solution, when no vehicle is being charged, charging one or more energy storage modules in the energy storage device according to the power generation curve includes: Analyze the power generation curve to determine the power generation and average power generation of the power generation device in the first preset time interval; Determine one or more energy storage modules to be charged by analyzing the remaining power of the energy storage module in the energy storage device, the power generation and the average power generation of the power generation device in the first preset time interval; The one or more energy storage modules to be charged are charged by the power generation device within a first preset time interval.

[0007] In this solution, when the charging mode is the normal charging mode, the vehicle is charged by the power generation device first, and the power is compensated by the energy storage device. When the power generation device does not meet the vehicle charging conditions, the vehicle is charged by the energy storage device, including: According to the vehicle's remaining power and rated slow charging power p low Determine the charging completion time and the amount of electricity required for charging; The power generation curve is intercepted based on the charging start time and the charging completion time to obtain the first power generation curve P a , and determine the first power generation curve P a The maximum power p a-max and minimum power p a-min ; When p a-min >p low When the vehicle is charged, the generated power is distributed to the charging gun connected to the vehicle, and the vehicle is charged normally through the power generation device; When p a-min <p low <p a-max When the vehicle is normally charged by the power generation device, the power is compensated by the energy storage device; When p a-max <p low When the vehicle is normally charged by the energy storage device, the rated slow charging power p low , a charging start time and a charging completion time to determine a second energy storage module for powering the vehicle, and an output power of each second energy storage module; When the sum of the remaining power of all the energy storage modules is less than the power required for charging the vehicle, the vehicle is charged normally through the power grid.

[0008] In this scheme, when p a-min <p low <p a-maxWhen the vehicle is charged normally by the power generation device, the power is compensated by the energy storage device, including: The first power generation curve P a Less than rated slow charging power p low The power generation curve is marked to determine one or more second power generation curves P b(n) , the one or more second power generation curves P b(n) The corresponding time interval is determined as the compensation time interval n; According to the rated slow charging power p low and the second power generation curve P b(n) The minimum power p b-min(n) The difference between the two determines the compensation power p of the compensation time interval n. c(n) ; Calculate the time length of compensation time interval n and compensation power p c(n) The product of determines the compensation power Q in compensation time interval n. c(n) ; According to the compensation power p of compensation time interval n c(n) And compensation power Q c(n) Determine the first energy storage modules that provide compensatory power supply to the vehicle within the compensation time interval n, and the output power of each first energy storage module.

[0009] In this solution, when the charging mode is the fast charging mode, multiple groups of fast charging time intervals are determined according to preset time intervals, and the first stable power supply power of the power generation device, the second stable power supply power of the energy storage device and the third stable power supply power of the power grid in each group of fast charging time intervals are calculated respectively, and the charging power is allocated to the vehicle according to each fast charging time interval, including: Determine whether the remaining power of the power grid is greater than the minimum fast charging power calibrated by the vehicle; If not, normal charging is performed; If yes, fast charging is performed, and multiple groups of fast charging time intervals m are determined according to the preset time intervals. Combined with the battery SOC value of the vehicle, the fast charging power range P corresponding to each fast charging time interval m is determined. m ; Determine the first stable power supply power p of the power generation device in the fast charging time interval m according to the minimum power of the power generation power curve in the fast charging time interval m 1(m) ; Filtering energy storage modules in the energy storage device that are in a non-idle state or whose remaining power is less than a preset power threshold, and determining the remaining energy storage modules as the third energy storage modules; The ratio of the remaining power of all third energy storage modules to the time length of the fast charging time interval m is accumulated to determine the second stable power supply power p of the energy storage device in the fast charging time interval m.2(m) ; According to the fast charging power range P corresponding to the fast charging time interval m m , the first stable power supply power p of the power generation device 1(m) and the second stable power supply power p of the energy storage device 2(m) Analyze and determine the third stable power supply power p of the power grid within the fast charging time interval m 3(m) .

[0010] This plan also includes: The third stable power supply power p of the power grid in the fast charging time interval m 3(m) The calculation method is expressed as: ; Among them, p max(m) and p min(m) They are respectively the fast charging power range P m The maximum fast charging power and minimum fast charging power, k1 and k2 are adjustment coefficients, k1+k2=1.

[0011] This plan also includes: The minimum output power of the remaining output power curve of the power grid within the fast charging time interval m is determined as the fourth output power p 4(m) ; When p 3(m) >p 4(m) When the fourth output power p 4(m) The third stable power supply power p of the power grid in the fast charging time interval m 3(m) Adjust so that p 3(m) =p 4(m) .

[0012] This plan also includes: When selecting an energy storage device for power supply or auxiliary power supply, the power supply score of each energy storage module is calculated based on the remaining power, charging interval, power supply conversion rate, and energy storage conversion rate; Based on the length of the corresponding time interval, calculate the average output power of each energy storage module in the corresponding time interval; The average output power of the energy storage modules in the corresponding time interval is accumulated in descending order of the power supply scores to determine the accumulated output power; When the accumulated output power meets the power supply condition or the auxiliary power supply condition, the energy storage module participating in the average data power accumulation is determined as the fourth energy storage module; the fourth energy storage module includes the first energy storage module, the second energy storage module and the third energy storage module; When charging the energy storage module, according to the power generation curve and the first stable power supply power p 1(m) Or rated slow charging power p lowThe curve difference of determines the remaining power generation curve of the corresponding time interval; Determine the remaining power generation in the corresponding time interval by using the remaining power generation curve; Based on the remaining power generation in the corresponding time interval, combined with the remaining power of the energy storage module, an analysis is performed, and one or more idle energy storage devices with a remaining power less than a preset power threshold are selected in descending order of power supply scores as energy storage modules to be stored; The energy storage modules to be stored are stored with energy in the corresponding time interval, and the energy storage power of each energy storage module to be stored is synchronously adjusted according to the allocated power generation power.

[0013] This plan also includes: One or more energy storage modules in the energy storage device are set as emergency energy storage modules according to the power supply of the energy storage device each time the photovoltaic storage charging and discharging integrated device enters the off-grid state within the second preset time interval; Replace the emergency energy storage module whose idle time is greater than the preset idle time threshold or whose battery SOC value is less than the preset battery SOC value threshold.

[0014] The second aspect of the present invention provides a photovoltaic storage charging and discharging integrated machine and off-grid coordinated control system, comprising: A data acquisition module, used to acquire meteorological data when the photovoltaic storage charging and discharging integrated device is in a grid-connected state; A power generation curve drawing module, used for analyzing the meteorological data and drawing a power generation curve; A first charging module, used for charging one or more energy storage modules in the energy storage device according to the power generation curve when no vehicle is being charged; A charging detection module, for performing charging processing according to a charging mode selected by a user when it is detected that the vehicle is being charged; the charging mode includes a normal charging mode and a fast charging mode; The second charging module is used for, when the charging mode is the normal charging mode, charging the vehicle through the power generation device first, and performing power compensation through the energy storage device; when the power generation device does not meet the vehicle charging conditions, charging the vehicle through the energy storage device; A third charging module is used for, when the charging mode is a fast charging mode, determining a plurality of groups of fast charging time intervals according to preset time intervals, respectively calculating a first stable power supply power of the power generation device, a second stable power supply power of the energy storage device and a third stable power supply power of the power grid in each group of fast charging time intervals, and distributing charging power to the vehicle according to each fast charging time interval; The on-grid and off-grid switching module is used to control the photovoltaic storage charging and discharging integrated machine to enter the off-grid state when the grid fails or the power is cut off, and to start the emergency energy storage module in the energy storage device to supply power.

[0015] The present invention discloses a photovoltaic storage charging and discharging integrated machine and off-grid coordinated control method and system, the method includes: drawing a power generation curve according to meteorological data; when no vehicle is charging, charging the energy storage device; when it is detected that the vehicle is in normal charging mode, charging the vehicle through the power generation device, and performing power compensation through the energy storage device; when the charging mode is a fast charging mode, determining the fast charging time interval, calculating the first stable power supply power of the power generation device, the second stable power supply power of the energy storage device and the third stable power supply power of the power grid, and distributing the charging power to the vehicle; when the power grid fails or the power is cut off, controlling the photovoltaic storage charging and discharging integrated machine to enter an off-grid state, and starting the emergency energy storage module in the energy storage device to supply power. The present invention controls the power generation device, the energy storage device and the power grid to supply power to the vehicle according to the rated power, thereby reducing the system data processing pressure and reducing the impact of charging power fluctuations on the vehicle battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A flow chart of a method for coordinated on-grid and off-grid control of a photovoltaic storage charging and discharging integrated device provided by the present invention is shown; Figure 2 A flow chart showing a method for supplying power to a vehicle in a common charging mode provided by the present invention is shown; Figure 3 A flow chart showing a method for supplying power to a vehicle in a fast charging mode provided by the present invention is shown; Figure 4 A block diagram of a photovoltaic storage charging and discharging integrated machine and off-grid coordinated control system provided by the present invention is shown. DETAILED DESCRIPTION

[0017] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0018] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0019] Figure 1 A flow chart of a method for coordinated on-grid and off-grid control of a photovoltaic storage charging and discharging integrated device provided by the present invention is shown.

[0020] like Figure 1 As shown, the present invention discloses a method for coordinated control of a photovoltaic storage charging and discharging integrated device on and off the grid, comprising: S102, when the photovoltaic storage charging and discharging integrated device is in a grid-connected state, obtaining meteorological data; S104, analyzing the meteorological data and drawing a power generation curve; S106, when there is no vehicle being charged, charging one or more energy storage modules in the energy storage device according to the power generation curve; S108, when it is detected that the vehicle is being charged, charging processing is performed according to the charging mode selected by the user; the charging mode includes a normal charging mode and a fast charging mode; S110, when the charging mode is the normal charging mode, the vehicle is charged by the power generation device first, and the power is compensated by the energy storage device. When the power generation device does not meet the vehicle charging conditions, the vehicle is charged by the energy storage device; S112, when the charging mode is a fast charging mode, determining multiple groups of fast charging time intervals according to preset time intervals, respectively calculating a first stable power supply power of the power generation device, a second stable power supply power of the energy storage device, and a third stable power supply power of the power grid in each group of fast charging time intervals, and distributing charging power to the vehicle according to each fast charging time interval; S114, when the power grid fails or the power is cut off, the photovoltaic storage charging and discharging integrated device is controlled to enter an off-grid state, and the emergency energy storage module in the energy storage device is started to supply power.

[0021] According to an embodiment of the present invention, the photovoltaic storage charging and discharging integrated machine includes a power generation device (such as a photovoltaic power generation device and a wind power generation device) and an energy storage device. When the photovoltaic storage charging and discharging integrated machine is in a grid-connected state, the electric energy generated by the power generation device can be used to power the equipment, for example, directly charging the battery of the electric vehicle through a charging gun, and can also be used to store energy in the energy storage device. At the same time, the remaining electricity can also be sold to the power grid. When the photovoltaic storage charging and discharging integrated machine is started, the meteorological data (including temperature and humidity, precipitation, wind power, etc.) of the current area is first obtained through the network and other channels, and the meteorological data is analyzed and combined with the historical power generation data to draw the power generation curve of the power generation device. When there is no vehicle charging, one or more energy storage modules are determined as energy storage modules to be charged according to the power generation curve and the remaining power of each energy storage module in the energy storage device, and the charging power is allocated according to the ratio of the required power of each energy storage module to be charged, and each energy storage module to be charged is charged.

[0022] When it is detected that the vehicle needs to be charged, the charging mode selected by the user is obtained. In the normal charging mode, the vehicle is charged by the power generation device. When the power generation power of the power generation device does not meet the rated slow charging power of the vehicle, the energy storage device is started for power compensation. When the energy storage device is used for power compensation, the second power generation curve is determined from the first power generation curve corresponding to the charging time, and the corresponding compensation time interval is determined. The minimum power of the second power generation curve is determined as the power supplied by the power generation device to the vehicle within the compensation time interval, and the compensation power of the energy storage device is determined. One or more energy storage modules are selected for power compensation according to the compensation power. When the power generation device does not meet the vehicle charging conditions (that is, the maximum power of the power generation curve is less than the rated slow charging power of the vehicle), one or more energy storage modules are selected based on the rated slow charging power to charge the vehicle. When the energy storage device also does not meet the vehicle charging conditions, the vehicle is charged through the power grid.

[0023] In the fast charging mode, the charging time is divided into multiple fast charging time intervals, and each fast charging time interval is analyzed in chronological order. The first stable power supply power of the power generation device is determined by the minimum power of the power generation curve in the fast charging time interval, and the second stable power supply power of the energy storage device is determined by the remaining power of each energy storage module in the energy storage device. The fast charging power range of the fast charging time interval is determined by the battery SOC value of the vehicle and the calibrated minimum fast charging power, and the third stable power supply power of the power grid is determined by combining the first stable power supply power and the second stable power supply power. Calculate the battery SOC value of the vehicle at the end of each fast charging time interval, and adjust the power supply power of the power generation device, energy storage device and power grid in the next fast charging time interval.

[0024] During the vehicle charging process, power is supplied in the order of the power generation device, the energy storage device and the power grid. The power supply power of the energy storage device is adjusted according to the power supply power of the power generation device, and the power supply power of the power grid is adjusted according to the power supply power of the energy storage device. The power supply power of the power generation device, the energy storage device and the power grid are all real-time variable powers, and the system data processing pressure is relatively large. In order to reduce the system data processing pressure, during the vehicle charging process, the power generation device, the energy storage device and the power grid all supply power to the vehicle at the rated power. At the same time, the impact of charging power fluctuations on the car battery is reduced. For example, the instability of the charging power will cause the current and voltage inside the battery to change continuously, thereby generating more heat, aggravating the damage to the battery, and shortening the battery life. Among them, the preset time interval is set by those skilled in the art according to actual needs.

[0025] When the grid fails or the power goes out, the photovoltaic storage charging and discharging integrated device is controlled to quickly switch to the off-grid mode, and the emergency energy storage module in the energy storage device is started, and the vehicle is powered by the power generation device, the energy storage module of the energy storage device and the emergency energy storage module. When the fault is repaired or the power supply is restored, the photovoltaic storage charging and discharging integrated device is controlled to switch to the grid-connected state.

[0026] According to an embodiment of the present invention, when no vehicle is being charged, charging one or more energy storage modules in the energy storage device according to the power generation curve includes: Analyze the power generation curve to determine the power generation and average power generation of the power generation device in the first preset time interval; Determine one or more energy storage modules to be charged by analyzing the remaining power of the energy storage module in the energy storage device, the power generation of the power generation device in the first preset time interval, and the average power generation power; One or more energy storage modules to be charged are charged by the power generation device within a first preset time interval.

[0027] It should be noted that the first preset time interval is a time interval in the future, and the specific time length of the first preset time interval is set by those skilled in the art according to actual needs. When no vehicle is charged by connecting a charging gun, the electric energy generated by a power generation device such as a photovoltaic power generation device or a wind power generation device is used to charge the energy storage device. The power generation curve is intercepted according to the first preset time interval, and the area formed by the power generation curve of the intercepted part, the coordinate axis, the start time and the end time of the first preset time interval are calculated to determine the power generation of the power generation device in the first preset time interval, and the ratio of the power generation to the time length of the first preset time interval is calculated to determine the average power generation of the power generation device in the first preset time interval. The required power of each energy storage module is determined according to the difference between the rated capacity and the remaining power of the energy storage module in the energy storage device, and the power supply score of each energy storage module is determined by weighted calculation of each power supply parameter of the energy storage module. The influence weight of each power supply parameter is set by those skilled in the art according to actual needs. The required power of the energy storage modules is accumulated in descending order according to the power supply scores. When the sum of the required power is greater than or equal to the power generation of the power generation device in the first preset time interval, the accumulation is terminated and the energy storage modules involved in the accumulation are determined as energy storage modules to be charged. In the first preset time interval, the charging power is allocated according to the ratio of the required power of each energy storage module to be charged, and each energy storage module to be charged is charged.

[0028] Figure 2 A flow chart of a method for supplying power to a vehicle in a common charging mode provided by the present invention is shown.

[0029] like Figure 2As shown, according to an embodiment of the present invention, when the charging mode is the normal charging mode, the vehicle is charged by the power generation device first, and the power is compensated by the energy storage device. When the power generation device does not meet the vehicle charging conditions, the vehicle is charged by the energy storage device, including: S202, based on the remaining power of the vehicle and the rated slow charging power p low Determine the charging completion time and the amount of electricity required for charging; S204, intercepting the power generation curve based on the charging start time and the charging completion time to obtain a first power generation curve P a , and determine the first power generation curve P a The maximum power p a-max and minimum power p a-min ; S206, when p a-min >p low When the power is on, the generated power is distributed to the charging gun connected to the vehicle, and the vehicle is charged normally through the power generation device; S208, when p a-min <p low <p a-max When the vehicle is charged normally through the power generation device, the power is compensated through the energy storage device; S210, when p a-max <p low When the vehicle is charged normally through the energy storage device, the rated slow charging power p low , the charging start time and the charging completion time determine the second energy storage module used to power the vehicle, and the output power of each second energy storage module; S212: When the sum of the remaining power of all the energy storage modules is less than the power required for charging the vehicle, the vehicle is charged normally through the power grid.

[0030] It should be noted that the rated slow charging power of general electric vehicles is usually 7kW. The required power for charging can be determined based on the difference between the rated capacity of the vehicle's battery and the remaining power. The slow charging time is determined by calculating the ratio of the required power for charging to the rated slow charging power. The slow charging time is added to the charging start time to determine the charging completion time. The charging start time defaults to the current time.

[0031] The rated slow charging power p of the vehicle low Respectively with the first power curve P a The maximum power p a-max and minimum power p a-min For comparison, when p a-min >p lowWhen the vehicle is being slowly charged, the power generation device will meet the rated slow charging power of the vehicle, and the vehicle will be powered directly by the power generation device. a-min <p low <p a-max When the power generation of the power generation device partially meets the rated slow charging power of the vehicle, the vehicle is powered by the power generation device first, and the power of the vehicle is compensated by the energy storage device; when p a-max <p low , the power generation power of the power generation device does not meet the rated slow charging power of the vehicle, and the vehicle is powered directly through the energy storage device. The energy storage modules in the idle state (not charging or discharging) are analyzed, and the power supply score of each energy storage module is calculated. The output power of each energy storage module is determined according to the ratio of the remaining power of the energy storage module and the length of the slow charging time. When the output power of the energy storage module is greater than the rated output power, the final output power of the energy storage module is determined as the rated output power. The output powers of the energy storage modules are accumulated in descending order according to the power supply scores. When the accumulated output power is greater than or equal to the rated slow charging power of the vehicle, the accumulation is terminated, and the energy storage modules involved in the accumulation are determined as the second energy storage modules. In addition, when the sum of the remaining power of all energy storage modules is less than the power required for charging the vehicle, the energy storage modules do not meet the normal charging conditions of the vehicle, and the vehicle is charged normally through the power grid.

[0032] According to an embodiment of the present invention, when p a-min <p low <p a-max When the vehicle is charged normally through the power generation device, the power is compensated through the energy storage device, including: For the first power generation curve P a Less than rated slow charging power p low The power generation curve is marked to determine one or more second power generation curves P b(n) , one or more second power generation curves P b(n) The corresponding time interval is determined as the compensation time interval n; According to the rated slow charging power p low and the second power generation curve P b(n) The minimum power p b-min(n) The difference between the two determines the compensation power p of the compensation time interval n. c(n) ; Calculate the time length of compensation time interval n and compensation power p c(n) The product of determines the compensation power Q in compensation time interval n. c(n) ; According to the compensation power p of compensation time interval n c(n) And compensation power Q c(n)Determine the first energy storage modules that provide compensation power to the vehicle within the compensation time interval n, and the output power of each first energy storage module.

[0033] It should be noted that when the power generation part of the power generation device meets the rated slow charging power of the vehicle, the first power generation curve of the power generation device is intercepted based on the rated slow charging power of the vehicle, one or more second power generation curves and corresponding compensation time intervals are determined, and the minimum power in the second power generation curve is determined as the output power of the power generation device to the vehicle in the corresponding compensation time interval. The energy storage module is screened by the compensation power and compensation power of the compensation time interval, and one or more energy storage modules are selected in order from large to small according to the power supply score, and their output power and remaining power are accumulated respectively. When the accumulated output power is greater than or equal to the rated slow charging power of the vehicle and the sum of the remaining power is greater than the power required for charging the vehicle, the energy storage module involved in the accumulation is determined as the first energy storage module, and the output power of each first energy storage module is determined according to the ratio of its remaining power to the time length of the corresponding compensation time interval. When the output power of the energy storage module is greater than the rated output power, the final output power of the energy storage module is determined as the rated output power.

[0034] Figure 3 A flow chart of a method for powering a vehicle in a fast charging mode provided by the present invention is shown.

[0035] like Figure 3 As shown, according to an embodiment of the present invention, when the charging mode is a fast charging mode, multiple groups of fast charging time intervals are determined according to preset time intervals, and the first stable power supply power of the power generation device, the second stable power supply power of the energy storage device, and the third stable power supply power of the power grid in each group of fast charging time intervals are calculated respectively, and the charging power is allocated to the vehicle according to each fast charging time interval, including: S302, determining whether the remaining power of the power grid is greater than the minimum fast charging power calibrated by the vehicle; S304, if not, perform normal charging; S306: If yes, then fast charge is performed, and multiple groups of fast charge time intervals m are determined according to the preset time intervals, and the fast charge power range P corresponding to each fast charge time interval m is determined by analyzing the battery SOC value of the vehicle. m ; S308, determining the first stable power supply power p of the power generation device in the fast charging time interval m according to the minimum power of the power generation power curve in the fast charging time interval m 1(m) ; S310, filtering energy storage modules in the energy storage device that are in a non-idle state or whose remaining power is less than a preset power threshold, and determining the remaining energy storage modules as third energy storage modules; S312, accumulating the ratio of the remaining power of all third energy storage modules to the time length of the fast charging time interval m, and determining the second stable power supply power p of the energy storage device in the fast charging time interval m. 2(m) ; S314: according to the fast charging power range P corresponding to the fast charging time interval m m , the first stable power supply power p of the power generation device 1(m) and the second stable power supply power p of the energy storage device 2(m) Analyze and determine the third stable power supply power p of the power grid within the fast charging time interval m 3(m) .

[0036] It should be noted that when the user selects the fast charging mode, the remaining power of the vehicle and the minimum fast charging power calibrated by the vehicle are first analyzed to determine the charging time required for the vehicle to be charged at the minimum fast charging power. When the power curve of the power grid within the charging time is greater than or equal to the minimum fast charging power calibrated by the vehicle, the vehicle is fast charged; otherwise, normal charging is performed. In the process of fast charging the vehicle, firstly, based on the current time (charging card start time), multiple groups of fast charging time intervals are determined according to preset time intervals, and the vehicle's battery SOC value is analyzed, and the maximum fast charging power corresponding to the battery SOC value and the minimum fast charging power calibrated by the vehicle are determined as the fast charging power range corresponding to the fast charging time interval. Analyze each fast charging time interval in chronological order, determine the first stable power supply power of the power generation device in the fast charging time interval according to the power generation curve, determine the second stable power supply power of the energy storage device in the fast charging time interval according to the remaining power of the energy storage module in the idle state in the energy storage device, calculate the third stable power supply power of the power grid through the fast charging power range of the fast charging time interval, the first stable power supply power of the power generation device and the second stable power supply power of the energy storage device, calculate the battery SOC value of the vehicle at the end of the current fast charging time interval, and adjust the power supply power of the power generation device, energy storage device and power grid in the next fast charging time interval. In each fast charging time interval, the power generation device is controlled to supply power to the vehicle at the first stable power supply, the energy storage device at the second stable power supply, and the power grid at the third stable power supply.

[0037] The preset power threshold is set by technicians in this field according to actual needs.

[0038] According to an embodiment of the present invention, it also includes: The third stable power supply power p of the power grid in the fast charging time interval m 3(m) The calculation method is expressed as: ; Among them, p max(m) and p min(m)They are respectively the fast charging power range P m The maximum fast charging power and minimum fast charging power, k1 and k2 are adjustment coefficients, k1+k2=1.

[0039] It should be noted that the adjustment coefficients k1 and k2 are adjusted according to the battery status of the vehicle during the charging process. For example, when the vehicle battery temperature is in the normal charging temperature range, the value of k1 is close to or equal to 1. After that, before the power is adjusted in each fast charging time interval according to the battery temperature change, the value of k1 is adjusted, including lowering the value of k1 when the battery temperature rises, and increasing the value of k1 when the battery temperature returns to the normal charging temperature range to ensure charging safety.

[0040] The sum of the first stable power supply power, the second stable power supply power and the third stable power supply power satisfies the fast charging power range corresponding to the fast charging time interval, that is, p min(m) ≤p 1(m) +p 2(m) +p 3(m) ≤p max(m) .

[0041] According to an embodiment of the present invention, it also includes: The minimum output power of the remaining output power curve of the power grid within the fast charging time interval m is determined as the fourth output power p 4(m) ; When p 3(m) >p 4(m) When the fourth output power p 4(m) The third stable power supply power p of the power grid in the fast charging time interval m 3(m) Adjust so that p 3(m) =p 4(m) .

[0042] It should be noted that the third stable power supply power is a rated power supply power. When power is supplied by the power grid, it is first verified whether the output power of the power grid within the fast charging time interval meets the output demand of the third stable power supply power throughout the entire process. The fourth output power is determined by the minimum output power of the remaining output power curve of the power grid, and compared with the third stable output power, and the third stable output power finally output by the power grid is adjusted.

[0043] The sum of the first stable power supply power, the second stable power supply power and the adjusted third stable power supply power also meets the fast charging power range corresponding to the fast charging time interval. Under certain circumstances, the emergency energy storage module can be started for auxiliary power supply so that the charging power of the vehicle at least meets the minimum fast charging power calibrated by the vehicle.

[0044] According to an embodiment of the present invention, when an energy storage device is selected for power supply or auxiliary power supply, the power supply score of each energy storage module is calculated according to the remaining power, charging interval time, power supply conversion rate, and energy storage conversion rate; Based on the length of the corresponding time interval, calculate the average output power of each energy storage module in the corresponding time interval; The average output power of the energy storage modules in the corresponding time interval is accumulated in descending order of the power supply scores to determine the accumulated output power; When the accumulated output power meets the power supply condition or the auxiliary power supply condition, the energy storage module participating in the average data power accumulation is determined as the fourth energy storage module; the fourth energy storage module includes the first energy storage module, the second energy storage module and the third energy storage module; When charging the energy storage module, according to the power generation curve and the first stable power supply power p 1(m) Or rated slow charging power p low The curve difference of determines the remaining power generation curve of the corresponding time interval; Determine the remaining power generation in the corresponding time interval through the remaining power generation curve; Based on the remaining power generation in the corresponding time interval, combined with the remaining power of the energy storage module, an analysis is performed, and one or more idle energy storage devices with a remaining power less than a preset power threshold are selected in descending order of power supply scores as energy storage modules to be stored; The energy storage modules to be stored are stored with energy in corresponding time intervals, and the energy storage power of each energy storage module to be stored is synchronously adjusted according to the allocated power generation power.

[0045] It should be noted that when selecting an energy storage device for power supply or auxiliary power supply, the system sets corresponding influence weights for power supply parameters such as remaining power, charging interval, power supply conversion rate, and energy storage conversion rate, and multiplies each power supply parameter of the energy storage module by the corresponding influence weight. The calculation results are accumulated to determine the power supply score of the energy storage module. The average output power of the energy storage module in the corresponding time interval is determined by the ratio of the remaining power of the energy storage module to the corresponding time interval. When the ratio of the remaining power of the energy storage module to the corresponding time interval is greater than the rated maximum output power of the energy storage module, the average output power of the energy storage module in the corresponding time interval is equal to the rated maximum output power of the energy storage module. Among them, the corresponding time interval includes the compensation time interval in the normal charging mode and the fast charging time interval in the fast charging mode.

[0046] When charging the energy storage module, draw the remaining power curve after the power generation device charges the vehicle, and calculate the area of ​​the area enclosed by the coordinate axis in combination with the start time and end time of the corresponding time interval to determine the remaining power generation in the corresponding time interval. Calculate the required power of each energy storage module to be stored in turn, and when the sum of the required power of all energy storage modules to be stored is greater than or equal to the remaining power generation in the corresponding time interval, determine the energy storage modules to be stored in the corresponding time interval, and determine the energy storage power of each energy storage module to be stored in the corresponding time interval based on the ratio of the energy storage modules to be stored and the time length of the corresponding time interval.

[0047] The preset power threshold is set by technicians in this field according to actual needs.

[0048] According to an embodiment of the present invention, it also includes: One or more energy storage modules in the energy storage device are set as emergency energy storage modules according to the power supply of the energy storage device each time the photovoltaic storage charging and discharging integrated device enters the off-grid state within the second preset time interval; Replace the emergency energy storage module whose idle time is greater than the preset idle time threshold or whose battery SOC value is less than the preset battery SOC value threshold.

[0049] It should be noted that the number of emergency energy storage modules is dynamically adjusted according to the power consumption of the energy storage modules during the recent off-grid period. The average power supply of the energy storage device of the photovoltaic storage charging and discharging integrated machine each time it enters the off-grid state within the second preset time interval (such as the past three months) is calculated to determine the average power supply of the emergency energy storage module, and the ratio of the average power supply to the rated capacity of the energy storage module is calculated to determine the number of emergency energy storage modules to be set, and one or more energy storage modules are set as emergency energy storage modules according to the set number.

[0050] In addition, during the setting process of the emergency energy storage module, in order to avoid damage to the energy storage module due to long-term non-use, other idle energy storage modules are replaced with emergency energy storage modules based on the idle time and the battery SOC value of the energy storage module.

[0051] Among them, the second preset time interval, the preset idle time threshold and the preset battery SOC value threshold are set by those skilled in the art according to actual needs.

[0052] Figure 4 A block diagram of a photovoltaic storage charging and discharging integrated machine and off-grid coordinated control system provided by the present invention is shown.

[0053] like Figure 4 As shown, the second aspect of the present invention provides a photovoltaic storage charging and discharging integrated machine and off-grid coordinated control system, comprising: A data acquisition module, used to acquire meteorological data when the photovoltaic storage charging and discharging integrated device is in a grid-connected state; The power generation curve drawing module is used to analyze the meteorological data and draw the power generation curve; A first charging module, used to charge one or more energy storage modules in the energy storage device according to a power generation curve when no vehicle is being charged; A charging detection module is used to perform charging processing according to the charging mode selected by the user when it is detected that the vehicle is charging; the charging mode includes a normal charging mode and a fast charging mode; The second charging module is used for, when the charging mode is the normal charging mode, charging the vehicle through the power generation device first, and performing power compensation through the energy storage device; when the power generation device does not meet the vehicle charging conditions, charging the vehicle through the energy storage device; A third charging module is used for, when the charging mode is a fast charging mode, determining a plurality of groups of fast charging time intervals according to preset time intervals, respectively calculating a first stable power supply power of the power generation device, a second stable power supply power of the energy storage device and a third stable power supply power of the power grid in each group of fast charging time intervals, and distributing charging power to the vehicle according to each fast charging time interval; The on-grid and off-grid switching module is used to control the photovoltaic storage charging and discharging integrated machine to enter the off-grid state when the grid fails or the power is cut off, and to start the emergency energy storage module in the energy storage device to supply power.

[0054] The information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals (including but not limited to signals transmitted between user terminals and other devices, etc.) involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant laws, regulations and standards of relevant countries and regions. For example, the "meteorological data" and "remaining power of the vehicle" involved in this disclosure are all obtained with full authorization.

[0055] The present invention discloses a photovoltaic storage charging and discharging integrated machine and off-grid coordinated control method and system, the method includes: drawing a power generation curve according to meteorological data; when no vehicle is charging, charging the energy storage device; when it is detected that the vehicle is in normal charging mode, charging the vehicle through the power generation device, and performing power compensation through the energy storage device; when the charging mode is a fast charging mode, determining the fast charging time interval, calculating the first stable power supply power of the power generation device, the second stable power supply power of the energy storage device and the third stable power supply power of the power grid, and distributing the charging power to the vehicle; when the power grid fails or the power is cut off, controlling the photovoltaic storage charging and discharging integrated machine to enter an off-grid state, and starting the emergency energy storage module in the energy storage device to supply power. The present invention controls the power generation device, the energy storage device and the power grid to supply power to the vehicle according to the rated power, thereby reducing the system data processing pressure and reducing the impact of charging power fluctuations on the vehicle battery.

[0056] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0057] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0058] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0059] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0060] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

Claims

1. A method for coordinated control of an integrated photovoltaic storage and charging / discharging device connected to and off the grid, characterized in that: include: When the photovoltaic storage charging and discharging integrated device is connected to the grid, meteorological data is obtained; Analyze the meteorological data and draw a power generation curve; When no vehicle is being charged, charging one or more energy storage modules in the energy storage device according to the power generation curve; When it is detected that the vehicle is being charged, charging is performed according to the charging mode selected by the user; the charging mode includes a normal charging mode and a fast charging mode; When the charging mode is the normal charging mode, the vehicle is charged by the power generation device first, and the power is compensated by the energy storage device. When the power generation device does not meet the vehicle charging conditions, the vehicle is charged by the energy storage device; When the charging mode is the fast charging mode, multiple groups of fast charging time intervals are determined according to preset time intervals, and the first stable power supply power of the power generation device, the second stable power supply power of the energy storage device and the third stable power supply power of the power grid in each group of fast charging time intervals are calculated respectively, and the charging power is allocated to the vehicle according to each fast charging time interval; When the grid fails or there is a power outage, the photovoltaic storage charging and discharging integrated machine is controlled to enter an off-grid state, and the emergency energy storage module in the energy storage device is started to supply power.

2. The method for controlling the grid-connected and off-grid coordinated photovoltaic storage and charging and discharging integrated device according to claim 1, characterized in that: When no vehicle is being charged, charging one or more energy storage modules in the energy storage device according to the power generation curve comprises: Analyze the power generation curve to determine the power generation and average power generation of the power generation device in the first preset time interval; Determine one or more energy storage modules to be charged by analyzing the remaining power of the energy storage module in the energy storage device, the power generation and the average power generation of the power generation device in the first preset time interval; The one or more energy storage modules to be charged are charged by the power generation device within a first preset time interval.

3. The grid-connected and off-grid coordinated control method of a photovoltaic storage charging and discharging integrated device according to claim 1, characterized in that: When the charging mode is the normal charging mode, the vehicle is charged by the power generation device first, and the power is compensated by the energy storage device; when the power generation device does not meet the vehicle charging conditions, the vehicle is charged by the energy storage device, including: According to the vehicle's remaining power and rated slow charging power p low Determine the charging completion time and the amount of electricity required for charging; The power generation curve is intercepted based on the charging start time and the charging completion time to obtain the first power generation curve P a , and determine the first power generation curve P a The maximum power p a-max and minimum power p a-min ; When p a-min >p low When the vehicle is charged, the generated power is distributed to the charging gun connected to the vehicle, and the vehicle is charged normally through the power generation device; When p a-min <p low <p a-max When the vehicle is normally charged by the power generation device, the power is compensated by the energy storage device; When p a-max <p low When the vehicle is normally charged by the energy storage device, the rated slow charging power p low , a charging start time and a charging completion time to determine a second energy storage module for powering the vehicle, and an output power of each second energy storage module; When the sum of the remaining power of all the energy storage modules is less than the power required for charging the vehicle, the vehicle is charged normally through the power grid.

4. The grid-connected and off-grid coordinated control method of the photovoltaic storage charging and discharging integrated device according to claim 3 is characterized in that: When p a-min <p low <p a-max When the vehicle is charged normally by the power generation device, the power is compensated by the energy storage device, including: The first power generation curve P a Less than rated slow charging power p low The power generation curve is marked to determine one or more second power generation curves P b(n) , the one or more second power generation curves P b(n) The corresponding time interval is determined as the compensation time interval n; According to the rated slow charging power p low and the second power generation curve P b(n) The minimum power p b-min(n) The difference between the two determines the compensation power p of the compensation time interval n. c(n) ; Calculate the time length of compensation time interval n and compensation power p c(n) The product of determines the compensation power Q in compensation time interval n. c(n) ; According to the compensation power p of compensation time interval n c(n) And compensation power Q c(n) Determine the first energy storage modules that provide compensatory power supply to the vehicle within the compensation time interval n, and the output power of each first energy storage module.

5. The grid-connected and off-grid coordinated control method of a photovoltaic storage charging and discharging integrated device according to claim 1, characterized in that: When the charging mode is the fast charging mode, a plurality of groups of fast charging time intervals are determined according to preset time intervals, a first stable power supply power of the power generation device, a second stable power supply power of the energy storage device, and a third stable power supply power of the power grid are calculated in each group of fast charging time intervals, and charging power is allocated to the vehicle according to each fast charging time interval, including: Determine whether the remaining power of the power grid is greater than the minimum fast charging power calibrated by the vehicle; If not, normal charging is performed; If yes, fast charging is performed, and multiple groups of fast charging time intervals m are determined according to the preset time intervals. Combined with the battery SOC value of the vehicle, the fast charging power range P corresponding to each fast charging time interval m is determined. m ; Determine the first stable power supply power p of the power generation device in the fast charging time interval m according to the minimum power of the power generation power curve in the fast charging time interval m 1(m) ; Filtering energy storage modules in the energy storage device that are in a non-idle state or whose remaining power is less than a preset power threshold, and determining the remaining energy storage modules as the third energy storage modules; The ratio of the remaining power of all third energy storage modules to the time length of the fast charging time interval m is accumulated to determine the second stable power supply power p of the energy storage device in the fast charging time interval m. 2(m) ; According to the fast charging power range P corresponding to the fast charging time interval m m , the first stable power supply power p of the power generation device 1(m) and the second stable power supply power p of the energy storage device 2(m) Analyze and determine the third stable power supply power p of the power grid within the fast charging time interval m 3(m) .

6. The method for controlling the grid-connected and off-grid coordinated photovoltaic storage and charging and discharging integrated device according to claim 5, characterized in that: Also includes: The third stable power supply power p of the power grid in the fast charging time interval m 3(m) The calculation method is expressed as: ； Among them, p max(m) and p min(m) They are respectively the fast charging power range P m The maximum fast charging power and minimum fast charging power, k1 and k2 are adjustment coefficients, k1+k2=1.

7. The method for controlling the grid-connected and off-grid coordinated photovoltaic storage and charging and discharging integrated device according to claim 6, characterized in that: Also includes: The minimum output power of the remaining output power curve of the power grid within the fast charging time interval m is determined as the fourth output power p 4(m) ; When p 3(m) >p 4(m) When the fourth output power p 4(m) The third stable power supply power p of the power grid in the fast charging time interval m 3(m) Adjust so that p 3(m) =p 4(m) .

8. The method for controlling the grid-connected and off-grid coordinated photovoltaic storage and charging and discharging integrated device according to claim 1, characterized in that: Also includes: When selecting an energy storage device for power supply or auxiliary power supply, the power supply score of each energy storage module is calculated based on the remaining power, charging interval, power supply conversion rate, and energy storage conversion rate; Based on the length of the corresponding time interval, calculate the average output power of each energy storage module in the corresponding time interval; The average output power of the energy storage modules in the corresponding time interval is accumulated in descending order of the power supply scores to determine the accumulated output power; When the accumulated output power meets the power supply condition or the auxiliary power supply condition, the energy storage module participating in the average data power accumulation is determined as the fourth energy storage module; the fourth energy storage module includes the first energy storage module, the second energy storage module and the third energy storage module; When charging the energy storage module, according to the power generation curve and the first stable power supply power p 1(m) Or rated slow charging power p low The curve difference of determines the remaining power generation curve of the corresponding time interval; Determine the remaining power generation in the corresponding time interval by using the remaining power generation curve; Based on the remaining power generation in the corresponding time interval, combined with the remaining power of the energy storage module, an analysis is performed, and one or more idle energy storage devices with a remaining power less than a preset power threshold are selected in descending order of power supply scores as energy storage modules to be stored; The energy storage modules to be stored are stored with energy in the corresponding time interval, and the energy storage power of each energy storage module to be stored is synchronously adjusted according to the allocated power generation power.

9. The method for controlling the grid-connected and off-grid coordinated photovoltaic storage and charging and discharging integrated device according to claim 1, characterized in that: Also includes: One or more energy storage modules in the energy storage device are set as emergency energy storage modules according to the power supply of the energy storage device each time the photovoltaic storage charging and discharging integrated device enters the off-grid state within the second preset time interval; Replace the emergency energy storage module whose idle time is greater than the preset idle time threshold or whose battery SOC value is less than the preset battery SOC value threshold.

10. A photovoltaic storage charging and discharging integrated machine on-grid and off-grid coordinated control system, used to implement the photovoltaic storage charging and discharging integrated machine on-grid and off-grid coordinated control method according to any one of claims 1 to 9, characterized in that: include: A data acquisition module, used to acquire meteorological data when the photovoltaic storage charging and discharging integrated device is in a grid-connected state; A power generation curve drawing module, used for analyzing the meteorological data and drawing a power generation curve; A first charging module, used for charging one or more energy storage modules in the energy storage device according to the power generation curve when no vehicle is being charged; A charging detection module, for performing charging processing according to a charging mode selected by a user when it is detected that the vehicle is being charged; the charging mode includes a normal charging mode and a fast charging mode; The second charging module is used for, when the charging mode is the normal charging mode, charging the vehicle through the power generation device first, and performing power compensation through the energy storage device; when the power generation device does not meet the vehicle charging conditions, charging the vehicle through the energy storage device; A third charging module is used for, when the charging mode is a fast charging mode, determining a plurality of groups of fast charging time intervals according to preset time intervals, respectively calculating a first stable power supply power of the power generation device, a second stable power supply power of the energy storage device and a third stable power supply power of the power grid in each group of fast charging time intervals, and distributing charging power to the vehicle according to each fast charging time interval; The on-grid and off-grid switching module is used to control the photovoltaic storage charging and discharging integrated machine to enter the off-grid state when the grid fails or the power is cut off, and to start the emergency energy storage module in the energy storage device to supply power.

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