Mobile multi-port optical storage and charging integrated device and control method

Abstract

The invention provides a mobile multi-port optical storage and charging integrated device and a control method, and relates to the technical field of new energy automobile charging, an energy storage module, a charging module, a chassis power module, a photovoltaic interface and a power grid interface are interconnected through a direct current bus, so that directional flow and distribution of energy are realized; the chassis power module is controlled to be started to move the mobile multi-port optical storage and charging integrated device, the power of the photovoltaic interface, the power of the charging module and the charge state actual value of the energy storage module are obtained through the monitoring module, and the power control mode of the mobile multi-port optical storage and charging integrated device is judged; generating a power control instruction of the energy storage module and the power grid interface according to the determined power control mode; power control instructions of the energy storage module and the power grid interface are input into the energy storage module and the power grid interface, power control over the energy storage module and the power grid interface is achieved, and the consumption capacity of distributed photovoltaic power generation is improved while the increasing charging requirement of a high-speed service area is met.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle charging technology, and in particular to a mobile multi-port integrated photovoltaic energy storage and charging device and its control method. Background Technology

[0002] With the rapid development of new energy vehicles, the demand for charging in places such as highway service areas is increasing, especially during peak periods such as holidays, when queuing for charging often leads to traffic congestion. However, highway service areas are mostly located at the end of the power grid and lack the support of the main power grid. Furthermore, due to transformer capacity limitations, it is difficult to increase the number of charging piles in service areas in the short term. On the other hand, with the promotion of distributed photovoltaic power generation, a large number of highway service areas have installed photovoltaic power generation systems, providing the necessary conditions for increasing the charging scale of service areas. However, the problem of photovoltaic power consumption has also brought certain challenges. Summary of the Invention

[0003] This invention provides a mobile multi-port integrated photovoltaic, energy storage, and charging device and control method, the purpose of which is to meet the charging needs of highway service areas while improving the absorption capacity of distributed photovoltaic power generation.

[0004] To achieve the above objectives, the present invention provides a mobile multi-port integrated photovoltaic, energy storage and charging device, including an energy storage module, a charging module, a chassis power module, a DC bus, a photovoltaic interface, a grid interface and a monitoring module; The first end of the photovoltaic interface is connected to the output end of the external photovoltaic module; The first end of the power grid interface is electrically connected to the external AC power grid. The second end of the photovoltaic interface is electrically connected to the first input end of the energy storage module and the charging module respectively via the DC bus; The second end of the grid interface is electrically connected to the first input end of the energy storage module and the charging module respectively via the DC bus; The first output terminal of the charging module is connected to the input terminal of the chassis power module, and the second output terminal of the charging module is connected to the power input terminal of the vehicle to be charged. The second input terminal of the charging module is connected to the power output terminal of the new energy vehicle; The input terminals of the monitoring module are connected to the output terminals of the energy storage module, the charging module, the chassis power module, the photovoltaic interface, and the grid interface, respectively. The output of the monitoring module is connected to the control terminals of the energy storage module, the charging module, the chassis power module, and the grid interface. The chassis power module is controlled to start the mobile multi-port photovoltaic-energy storage-charging integrated device.

[0005] Furthermore, the energy storage module includes a first energy storage battery, a second energy storage battery, a power equalizer, a first bidirectional converter, a second bidirectional converter, a temperature sensor, a first voltage detection unit, and a first current detection unit; The first end of the first bidirectional converter is connected to the second end of the photovoltaic interface, the second end of the grid interface, and the first input end of the charging module via a DC bus. The second terminal of the first bidirectional converter is connected to the first energy storage battery and the first terminal of the power equalizer, respectively. The first end of the second bidirectional converter is connected to the second end of the photovoltaic interface, the second end of the grid interface, and the first input end of the charging module via a DC bus. The second terminal of the second bidirectional converter is connected to the second energy storage battery and the second terminal of the power equalizer, respectively. The output terminals of the temperature sensor, the first voltage detection unit, and the first current detection unit are all connected to the input terminal of the monitoring module. The control terminals of the first bidirectional converter, the second bidirectional converter, and the power equalizer are all connected to the output terminal of the monitoring module.

[0006] Furthermore, the charging module includes a first unidirectional converter, a second unidirectional converter, an energy regulator, a first charging gun, a second charging gun, a second voltage detection unit, and a second current detection unit. The input terminal of the first unidirectional converter is connected to the second terminal of the photovoltaic interface, the second terminal of the grid interface, the first terminal of the first bidirectional converter, and the first terminal of the second bidirectional converter via a DC bus, respectively. The output terminal of the first unidirectional converter is connected to the first terminal of the first charging gun and the first terminal of the energy converter, respectively. The second terminal of the first charging gun is connected to the power input terminal of the vehicle to be charged or the power output terminal of the new energy vehicle. The input terminal of the second unidirectional converter is connected to the second terminal of the photovoltaic interface, the second terminal of the grid interface, the first terminal of the first bidirectional converter, and the first terminal of the second bidirectional converter via the DC bus, respectively. The output of the second unidirectional converter is connected to the input of the chassis power module, the first end of the second charging gun, and the second end of the energy converter, respectively. The second end of the second charging gun is connected to the power input of the vehicle to be charged or the power output of the new energy vehicle. The output terminals of the second voltage detection unit and the second current detection unit are both connected to the input terminal of the monitoring module. The control terminal of the energy regulator is connected to the output terminal of the monitoring module.

[0007] Furthermore, the photovoltaic interface includes a third unidirectional converter, a third voltage detection unit, and a third current detection unit; The input terminal of the third unidirectional converter is connected to the output terminal of the external photovoltaic module; The output of the third unidirectional converter is connected to the first terminal of the first bidirectional converter, the first terminal of the second bidirectional converter, the input terminal of the first unidirectional converter, and the input terminal of the second unidirectional converter via a DC bus, respectively. The output terminals of the third voltage detection unit and the third current detection unit are both connected to the input terminal of the monitoring module.

[0008] Furthermore, the grid interface includes a third bidirectional converter, a fourth voltage detection unit, and a fourth current detection unit; The first terminal of the third bidirectional converter is electrically connected to the external AC power grid. The second terminal of the third bidirectional converter is connected to the first terminal of the first bidirectional converter, the first terminal of the second bidirectional converter, the input terminal of the first unidirectional converter, and the input terminal of the second unidirectional converter via a DC bus. The output terminals of the fourth voltage detection unit and the fourth current detection unit are both connected to the input terminal of the monitoring module. The control terminal of the third bidirectional converter is connected to the output terminal of the monitoring module.

[0009] Furthermore, the monitoring module includes a data acquisition unit, a control unit, and a display unit; The input terminals of the data acquisition unit are respectively connected to the output terminals of the temperature sensor, the first voltage detection unit, the second voltage detection unit, the third voltage detection unit, the fourth voltage detection unit, the first current detection unit, the second current detection unit, the third current detection unit, and the fourth current detection unit. The output of the data acquisition unit is connected to the input of the control unit. The first output of the control unit is connected to the input of the display unit. The second output of the control unit is connected to the control terminals of the first bidirectional converter, the second bidirectional converter, the power equalizer, the energy balancer, the third bidirectional converter, and the chassis power module, respectively.

[0010] This invention also provides a control method for a mobile multi-port integrated optical storage and charging device, applicable to such a device, the control method comprising: Step 1: Obtain the actual power of the photovoltaic interface, the power of the charging module, and the state of charge of the energy storage module through the monitoring module; Step 2: Determine the power control mode of the mobile multi-port photovoltaic-storage-charging integrated device based on the power of the photovoltaic interface, the power of the charging module, and the actual value of the state of charge of the energy storage module. Step 3: Generate power control commands for the energy storage module and grid interface based on the determined power control mode; Step 4: Input the power control commands of the energy storage module and the grid interface into the energy storage module and the grid interface to realize power control of the energy storage module and the grid interface.

[0011] Furthermore, the power control modes of the mobile multi-port integrated photovoltaic energy storage and charging device include: First power control mode: The input power of the photovoltaic interface is greater than the output power of the charging module, and the actual value of the state of charge of the energy storage module is less than or equal to the maximum preset threshold. The photovoltaic interface receives energy from the external photovoltaic module to power the charging module, and the monitoring module stores the surplus energy by starting the energy storage module. Second power control mode: The input power of the photovoltaic interface is greater than the output power of the charging module, and the actual value of the state of charge of the energy storage module is greater than the maximum preset threshold. The photovoltaic interface receives energy from the external photovoltaic module to power the charging module, and the monitoring module feeds the surplus energy into the external AC grid by activating the grid interface. Third power control mode: The input power of the photovoltaic interface is less than the output power of the charging module, and the actual value of the state of charge of the energy storage module is greater than or equal to the minimum preset threshold. The photovoltaic interface receives energy from the external photovoltaic module, the monitoring module starts the energy storage module, and controls the energy output of the energy storage module to work together with the energy input of the photovoltaic interface to power the charging module. Fourth power control mode: When the input power of the photovoltaic interface is less than the output power of the charging module and the actual state of charge of the energy storage module is less than the minimum preset threshold, the photovoltaic interface receives energy from the external photovoltaic module, the monitoring module starts the grid interface to connect energy from the external AC grid, controls the energy connected to the photovoltaic interface and the energy connected to the grid interface to work together to power the charging module, and starts the energy storage module to store the surplus energy.

[0012] Furthermore, control methods also include: The energy balancer in the charging module is controlled to achieve energy balance control between the two new energy vehicles.

[0013] Furthermore, control methods also include: The power equalizer in the energy storage module is controlled to achieve power equalization control of the energy storage batteries in the energy storage module.

[0014] The above-described solution of the present invention has the following beneficial effects: This invention includes an energy storage module, a charging module, a chassis power module, a DC bus, a photovoltaic interface, a grid interface, and a monitoring module. Compared with existing technologies, the energy storage module, charging module, chassis power module, photovoltaic interface, and grid interface of this invention are all interconnected through a DC bus to achieve directional energy flow and distribution. The chassis power module is controlled to start a mobile multi-port integrated photovoltaic-energy storage-charging device. The monitoring module acquires the actual power of the photovoltaic interface, the power of the charging module, and the state of charge (SOC) of the energy storage module. Based on the power of the photovoltaic interface, the power of the charging module, and the SOC of the energy storage module, the power control mode of the mobile multi-port integrated photovoltaic-energy storage-charging device is determined. Power control commands for the energy storage module and grid interface are generated according to the determined power control mode. The power control commands for the energy storage module and grid interface are input to the energy storage module and grid interface to achieve power control of the energy storage module and grid interface. This meets the increasing charging demand in highway service areas while improving the absorption capacity of distributed photovoltaic power generation.

[0015] Other beneficial effects of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the device structure according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating the control method in an embodiment of the present invention. Detailed Implementation

[0017] To make the technical problems, solutions, and advantages of this invention clearer, a detailed description will be provided below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0018] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a locking connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] This invention addresses existing problems by providing a mobile, multi-port integrated optical storage and charging device and its control method.

[0022] like Figure 1 As shown, an embodiment of the present invention provides a mobile multi-port photovoltaic-storage-charging integrated device, including an energy storage module, a charging module, a chassis power module, a DC bus, a photovoltaic interface, a grid interface, and a monitoring module; The first end of the photovoltaic interface is connected to the output end of the external photovoltaic module; The first end of the power grid interface is electrically connected to the external AC power grid. The second end of the photovoltaic interface is electrically connected to the first input end of the energy storage module and the charging module respectively via the DC bus; The second end of the grid interface is electrically connected to the first input end of the energy storage module and the charging module respectively via the DC bus; The first output terminal of the charging module is connected to the input terminal of the chassis power module, and the second output terminal of the charging module is connected to the power input terminal of the vehicle to be charged. The second input terminal of the charging module is connected to the power output terminal of the new energy vehicle; The input terminals of the monitoring module are connected to the output terminals of the energy storage module, the charging module, the chassis power module, the photovoltaic interface, and the grid interface, respectively. The output of the monitoring module is connected to the control terminals of the energy storage module, the charging module, the chassis power module, and the grid interface. The chassis power module is controlled to start the mobile multi-port photovoltaic-energy storage-charging integrated device.

[0023] The working principle of this invention embodiment is as follows: Energy is received from external photovoltaic modules or the external AC power grid via a photovoltaic interface or a grid interface and transmitted to the DC bus. The monitoring module controls the energy storage module, grid interface, and charging module based on the input power of the energy storage module and the photovoltaic interface, and the output power of the charging module. When the energy received by the photovoltaic interface is sufficient and the energy stored in the energy storage module is less than the maximum preset threshold, power is supplied to the charging module, and the excess current on the DC bus is transferred to the energy storage module for storage. When the energy stored in the energy storage module is greater than or equal to the maximum preset threshold, the monitoring module controls the grid interface to feed the excess energy into the external AC power grid. The input power of the photovoltaic interface is less than the output power of the charging module. When the power input of the photovoltaic interface is less than the output power of the charging module, and the actual state of charge of the energy storage module is greater than or equal to the minimum preset threshold, the photovoltaic interface receives energy from the external photovoltaic module. The monitoring module then starts the energy storage module and controls the energy output of the energy storage module to work together with the energy input of the photovoltaic interface to power the charging module. When the power input of the photovoltaic interface is less than the output power of the charging module, and the actual state of charge of the energy storage module is less than the minimum preset threshold, the photovoltaic interface receives energy from the external photovoltaic module. The monitoring module then starts the grid interface to receive energy from the external AC grid and controls the energy input of the photovoltaic interface to work together with the energy input of the grid interface to power the charging module. It also starts the energy storage module to store the surplus energy.

[0024] Specifically, the energy storage module includes a first energy storage battery for energy storage, a second energy storage battery, a power equalizer for balancing the output power of the two sets of energy storage battery devices, a first bidirectional converter for controlling the energy interaction between the first energy storage battery and the DC bus, a second bidirectional converter for controlling the energy interaction between the second energy storage battery and the DC bus, a temperature sensor for detecting battery temperature, a first voltage detection unit for monitoring the voltage and current values ​​at the connection point with the DC bus, and a first current detection unit. The first end of the first bidirectional converter is connected to the second end of the photovoltaic interface, the second end of the grid interface, and the first input end of the charging module via a DC bus. The second terminal of the first bidirectional converter is connected to the first energy storage battery and the first terminal of the power equalizer, respectively. The first end of the second bidirectional converter is connected to the second end of the photovoltaic interface, the second end of the grid interface, and the first input end of the charging module via a DC bus. The second terminal of the second bidirectional converter is connected to the second energy storage battery and the second terminal of the power equalizer, respectively. The output terminals of the temperature sensor, the first voltage detection unit, and the first current detection unit are all connected to the input terminal of the monitoring module. The control terminals of the first bidirectional converter, the second bidirectional converter, and the power equalizer are all connected to the output terminal of the monitoring module.

[0025] In this embodiment of the invention, two temperature sensors are respectively disposed at the placement positions of the first energy storage battery and the second energy storage battery, for detecting the temperature data of the first energy storage battery and the second energy storage battery; the first voltage detection unit includes four voltage sensors respectively disposed at the first energy storage battery, the second energy storage battery, the connection point of the first bidirectional converter and the DC bus, and the connection point of the second bidirectional converter and the DC bus, for detecting voltage values; the first current detection unit includes four current sensors respectively disposed at the first energy storage battery, the second energy storage battery, the connection point of the first bidirectional converter and the DC bus, and the connection point of the second bidirectional converter and the DC bus, for detecting current values.

[0026] In this embodiment of the invention, both the first bidirectional converter and the second bidirectional converter are DC / DC converters, specifically composed of two controllable switching devices and two diodes. Their small number of switches significantly reduces switching losses and improves the operating efficiency of the energy storage module during charging and discharging. The power equalizer consists of an energy storage capacitor and power electronic switches. The power electronic switches are connected in series with the energy storage battery pack, and the power electronic switches themselves are connected in parallel. The capacitor, acting as the energy storage medium for the power equalizer, is located between the battery pack and the power electronic switches. When the first and second energy storage batteries... When the state of charge difference exceeds 10%, the monitoring module controls the power equalizer to start. Taking the state of charge of the first energy storage battery exceeding that of the second energy storage battery by 10% as an example, when the power equalizer starts, within one switching cycle, the upper bridge arm switch in the power equalizer is turned on, and the first energy storage battery charges the energy storage capacitor. Subsequently, the upper bridge arm switch is turned off, and the lower bridge arm switch is turned on, and the energy storage capacitor charges the second energy storage battery. The devices in the power equalizer are scalable and can expand the number of battery packs. By adding a power equalization bridge arm, the expansion of the number of battery packs and active power equalization can be achieved.

[0027] Specifically, the charging module includes a first unidirectional converter, a second unidirectional converter, an energy regulator, a first charging gun, a second charging gun, a second voltage detection unit, and a second current detection unit. The input terminal of the first unidirectional converter is connected to the second terminal of the photovoltaic interface, the second terminal of the grid interface, the first terminal of the first bidirectional converter, and the first terminal of the second bidirectional converter (i.e., the energy storage module) via the DC bus. The output terminal of the first unidirectional converter is connected to the first terminal of the first charging gun and the first terminal of the energy converter, respectively. The second terminal of the first charging gun is connected to the power input terminal of the vehicle to be charged or the power output terminal of the new energy vehicle. The input terminal of the second unidirectional converter is connected to the second terminal of the photovoltaic interface, the second terminal of the grid interface, the first terminal of the first bidirectional converter, and the first terminal of the second bidirectional converter (i.e., the energy storage module) via the DC bus. The output of the second unidirectional converter is connected to the input of the chassis power module, the first end of the second charging gun, and the second end of the energy converter, respectively. The second end of the second charging gun is connected to the power input of the vehicle to be charged or the power output of the new energy vehicle. The output terminals of the second voltage detection unit and the second current detection unit are both connected to the input terminal of the monitoring module. The control terminal of the energy regulator is connected to the output terminal of the monitoring module.

[0028] In this embodiment of the invention, the charging module can achieve dual-gun output and includes an energy regulator. The energy regulator does not operate under normal working conditions and needs to be controlled by the monitoring module. The energy regulator consists of eight switching transistors, two voltage-stabilizing capacitors, a transformer, and an inductor. The first four switching transistors and the inductor are located on the primary side of the transformer, and the last four switching transistors are located on the secondary side of the transformer. The two voltage-stabilizing capacitors are located at both ends of the energy regulator. After the energy regulator is turned on, the energy of the electric vehicle connected to the primary side is transferred from the primary side to the secondary side by alternating conduction of the first and fourth switching transistors, and the second and third switching transistors. The secondary side then performs rectification by alternating conduction of the fifth and eighth switching transistors, and the sixth and seventh switching transistors, to charge the electric vehicle on the secondary side. The voltage-stabilizing capacitors are used to stabilize the input and output voltages. At the same time, an isolation transformer is used to improve the safety and reliability of the energy regulator. The first unidirectional converter and the second unidirectional converter are both DC / DC converters, which are composed of chopper boost circuits commonly used in the art.

[0029] In this embodiment of the invention, the second voltage detection unit includes four voltage sensors located at the connection points of the first unidirectional converter and the DC bus, the second unidirectional converter and the DC bus, and both ends of the energy regulator, for detecting voltage values. The second current detection unit includes four current sensors located at the connection points of the first unidirectional converter and the DC bus, the second unidirectional converter and the DC bus, and both ends of the energy regulator, for detecting current values.

[0030] In this embodiment of the invention, the chassis power module adopts DC drive and is directly connected to the output terminal of the second unidirectional converter in the charging module. It is directly powered by the second unidirectional converter to ensure the energy supply requirements during the movement process. The chassis power module also includes a voltage sensor, a current sensor and a speed sensor located at the DC motor to obtain the voltage, current and speed of the DC motor to characterize the working state of the chassis power module.

[0031] Specifically, the photovoltaic interface used to transmit the energy output from the external photovoltaic module to the DC bus and to distribute the power through the DC bus includes a third unidirectional converter, a third voltage detection unit, and a third current detection unit. The input terminal of the third unidirectional converter is connected to the output terminal of the external photovoltaic module; The output of the third unidirectional converter is connected to the first terminal of the first bidirectional converter, the first terminal of the second bidirectional converter, the input terminal of the first unidirectional converter, and the input terminal of the second unidirectional converter via a DC bus, respectively. The output terminals of the third voltage detection unit and the third current detection unit are both connected to the input terminal of the monitoring module.

[0032] In this embodiment of the invention, the third unidirectional converter is a DC / DC converter, and the third voltage detection unit includes two voltage sensors, respectively located at the connection point between the third unidirectional converter and the external photovoltaic module and at the connection point between the third unidirectional converter and the DC bus, for detecting voltage values. The third current detection unit includes two current sensors, respectively located at the connection point between the third unidirectional converter and the external photovoltaic module and at the connection point between the third unidirectional converter and the DC bus, for detecting current values. The voltage, current, and power output of the photovoltaic interface are monitored through the third voltage detection unit and the third current detection unit.

[0033] Specifically, the grid interface includes a third bidirectional converter, a fourth voltage detection unit, and a fourth current detection unit; The first terminal of the third bidirectional converter is electrically connected to the external AC power grid. The second terminal of the third bidirectional converter is connected to the first terminal of the first bidirectional converter, the first terminal of the second bidirectional converter, the input terminal of the first unidirectional converter, and the input terminal of the second unidirectional converter via a DC bus. The output terminals of the fourth voltage detection unit and the fourth current detection unit are both connected to the input terminal of the monitoring module. The control terminal of the third bidirectional converter is connected to the output terminal of the monitoring module.

[0034] In this embodiment of the invention, one end of the third bidirectional converter is a DC port for connecting to the DC bus, and the other end is an AC port for connecting to the external AC power grid, so as to realize power interaction between the device and the AC power grid. When the photovoltaic power generation is sufficient, the surplus energy is fed into the AC power grid. When the photovoltaic power generation is insufficient, the power of the grid is transmitted to the DC bus to meet the operating requirements of the device.

[0035] In this embodiment of the invention, the fourth voltage detection unit includes two voltage sensors, which are respectively disposed at the connection point between the third bidirectional converter and the external AC power grid and at the connection point between the third bidirectional converter and the DC bus. The fourth current detection unit includes two current sensors, which are respectively disposed at the connection point between the third bidirectional converter and the external AC power grid and at the connection point between the third bidirectional converter and the DC bus. The fourth voltage detection unit and the fourth current detection unit are used to detect the interaction power between the device and the external AC power grid.

[0036] Specifically, the monitoring module includes a data acquisition unit, a control unit, and a display unit; The input terminals of the data acquisition unit are respectively connected to the output terminals of the temperature sensor, the first voltage detection unit, the second voltage detection unit, the third voltage detection unit, the fourth voltage detection unit, the first current detection unit, the second current detection unit, the third current detection unit, and the fourth current detection unit. The output of the data acquisition unit is connected to the input of the control unit. The first output of the control unit is connected to the input of the display unit. The second output of the control unit is connected to the control terminals of the first bidirectional converter, the second bidirectional converter, the power equalizer, the energy balancer, the third bidirectional converter, and the chassis power module, respectively.

[0037] In this embodiment of the invention, the data acquisition unit is used to acquire data output from various sensors, send the acquired data to the control unit for comparison and analysis, and if the data exceeds the preset range, trigger the protection mechanism to perform trip protection, and display the relevant fault status on the display unit.

[0038] In this embodiment of the invention, the display unit is a human-computer interaction interface. Control commands can be input on the display unit to set the relevant module units of the device, such as controlling the energy balancer to realize energy balance control between two electric vehicles.

[0039] like Figure 2 As shown, this embodiment of the invention also provides a control method for a mobile multi-port integrated optical storage and charging device, applied to the mobile multi-port integrated optical storage and charging device, the control method including: Step 1: Obtain the actual power of the photovoltaic interface, the power of the charging module, and the state of charge of the energy storage module through the monitoring module; Step 2: Determine the power control mode of the mobile multi-port photovoltaic-storage-charging integrated device based on the power of the photovoltaic interface, the power of the charging module, and the actual value of the state of charge of the energy storage module. Step 3: Generate power control commands for the energy storage module and grid interface based on the determined power control mode; Step 4: Input the power control commands of the energy storage module and the grid interface into the energy storage module and the grid interface to realize power control of the energy storage module and the grid interface.

[0040] In this embodiment of the invention, the power control algorithm is as follows: ; ; ; ; in, For photovoltaic power, The total output power of the charging gun. The power of the photovoltaic system to charge the energy storage battery. The power transmitted from photovoltaic cells to the grid. This refers to the power supply from the energy storage battery to the charging gun. The charging power of the energy storage battery, This represents the maximum charging power of the energy storage battery. For efficiency, In Indicates when At that time, the photovoltaic power will be used to charge the energy storage battery. The photovoltaic power will not be used to charge the energy storage batteries.

[0041] In this embodiment of the invention, the power control among the photovoltaic interface, the grid interface, the energy storage module, and the charging module aims to achieve local consumption of photovoltaic power and economical operation of the device while meeting the charging needs of electric vehicles through energy storage power control and grid power control.

[0042] This embodiment of the invention takes a photovoltaic power of 20KW, a charging power of 80KW, and a storage battery SOC of 80% as an example: After obtaining the corresponding status information from sensors such as voltage, current, and temperature deployed on the photovoltaic module, energy storage module, and charging module, the control unit in the monitoring module will calculate the photovoltaic power, charging power, and storage battery SOC based on this information. When the photovoltaic power is detected to be 20KW, the charging power to be 80KW, and the storage battery SOC to be 80%, satisfying the conditions that the photovoltaic power is less than the charging power and the storage battery SOC is greater than 20%, the device will activate the third power control mode and send power control commands to the switching circuits of each module. The grid interface will remain closed, and the power generated by the photovoltaic module will be used to power the charging module through the photovoltaic interface-DC bus-charging module. The first and second storage batteries will each output 30KW of power, supplying power to the DC bus through the first and second bidirectional converters respectively, and then supplying power to the charging module from the DC bus to compensate for the 60KW charging power shortfall.

[0043] Specifically, the power control modes of the mobile multi-port integrated photovoltaic energy storage and charging device include: First power control mode: The input power of the photovoltaic interface is greater than the output power of the charging module, and the actual value of the state of charge of the energy storage module is less than or equal to the maximum preset threshold (90%). The photovoltaic interface receives energy from the external photovoltaic module to power the charging module, and the monitoring module stores the surplus energy by starting the energy storage module. Second power control mode: The input power of the photovoltaic interface is greater than the output power of the charging module, and the actual value of the state of charge of the energy storage module is greater than the maximum preset threshold (90%). The photovoltaic interface receives energy from the external photovoltaic module to power the charging module, and the monitoring module feeds the surplus energy into the external AC grid by starting the grid interface. Third power control mode: The input power of the photovoltaic interface is less than the output power of the charging module, and the actual value of the state of charge of the energy storage module is greater than or equal to the minimum preset threshold (20%). The photovoltaic interface receives energy from the external photovoltaic module, the monitoring module starts the energy storage module, and controls the energy output of the energy storage module and the energy connected to the photovoltaic interface to work together to power the charging module. Fourth power control mode: When the input power of the photovoltaic interface is less than the output power of the charging module, and the actual state of charge of the energy storage module is less than the minimum preset threshold (20%), the photovoltaic interface receives energy from the external photovoltaic module, the monitoring module starts the grid interface, connects energy from the external AC grid, controls the energy connected to the photovoltaic interface and the energy connected to the grid interface to work together to power the charging module, and starts the energy storage module to store the surplus energy.

[0044] It should be noted that in the fourth power control mode, the energy demand of the charging module must be guaranteed before the energy storage module is activated to store the surplus energy.

[0045] Specifically, control methods also include: The energy balancer in the charging module is controlled to achieve energy balance control between the two new energy vehicles.

[0046] Specifically, after the monitoring module actively activates the energy mutual aid device, the control unit will adjust and shut down the mutual aid power of the energy mutual aid device based on the status parameters of the two electric vehicles participating in the energy mutual aid. Taking the energy mutual aid from electric vehicle 1 to electric vehicle 2 as an example, electric vehicle 1 will charge electric vehicle 2 through the first charging gun - energy mutual aid device - second charging gun, and monitor the SOC of the batteries of the two vehicles in real time. When the battery of electric vehicle 2 is low, the energy mutual aid device will operate at maximum power; when the battery of electric vehicle 2 exceeds 30%, the energy mutual aid device will stop working.

[0047] Specifically, control methods also include: The power equalizer in the energy storage module is controlled to achieve power equalization control of the energy storage batteries in the energy storage module.

[0048] Specifically, when the SOC difference between the first and second energy storage batteries exceeds 10%, the energy storage battery power balancing control mode will be activated to perform power balancing. The power equalizer will adjust parameters such as the duty cycle of the power electronic switch of the power equalizer according to the SOC difference between the two energy storage batteries to adjust the balancing power. The greater the SOC difference between the two energy storage batteries, the higher the balancing power of the power equalization circuit. When the SOC difference between the two energy storage batteries is less than 2%, the power equalizer stops working.

[0049] In this embodiment of the invention, the power balancer adopts the following control logic: when the SOC difference between the two battery packs exceeds 10%, the power balancing circuit is activated.

[0050] Specifically, the power balance target is: ; ; in, This represents the transmitted power of the power equalization circuit, with the goal of making it zero. The energy transferred by the power balancing circuit during one switching cycle. This represents the time of one switching cycle. The difference in state of charge between the two battery packs The current flowing through the power equalizer, The duty cycle of the switch. The switching cycle.

[0051] Specifically, the monitoring module also supports switching between the device's charging mode and mobility mode. It is mainly used to control the device's operating mode. In charging mode, it controls the first unidirectional converter to provide power to the first charging gun and controls the second unidirectional converter to provide power to the second charging gun. In mobility mode, it controls the second unidirectional converter to provide power to the chassis power module, thereby realizing the switching between charging mode and mobility mode.

[0052] This invention includes an energy storage module, a charging module, a chassis power module, a DC bus, a photovoltaic interface, a grid interface, and a monitoring module. Compared with existing technologies, the energy storage module, charging module, chassis power module, photovoltaic interface, and grid interface of this invention are all interconnected through a DC bus to achieve directional energy flow and distribution. The chassis power module is controlled to start a mobile multi-port integrated photovoltaic-energy storage-charging device. The monitoring module acquires the actual power of the photovoltaic interface, the power of the charging module, and the state of charge (SOC) of the energy storage module. Based on the power of the photovoltaic interface, the power of the charging module, and the SOC of the energy storage module, the power control mode of the mobile multi-port integrated photovoltaic-energy storage-charging device is determined. Power control commands for the energy storage module and grid interface are generated according to the determined power control mode. The power control commands for the energy storage module and grid interface are input to the energy storage module and grid interface to achieve power control of the energy storage module and grid interface. This meets the increasing charging demand in highway service areas while improving the absorption capacity of distributed photovoltaic power generation.

[0053] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A mobile multi-port integrated optical storage and charging device, characterized in that, Includes energy storage modules, charging modules, chassis power modules, DC bus, photovoltaic interfaces, grid interfaces, and monitoring modules; The first end of the photovoltaic interface is connected to the output end of the external photovoltaic module; The first end of the power grid interface is electrically connected to the external AC power grid. The second end of the photovoltaic interface is electrically connected to the first input end of the energy storage module and the charging module respectively through the DC bus; The second end of the power grid interface is electrically connected to the first input end of the energy storage module and the charging module respectively through the DC bus; The first output terminal of the charging module is connected to the input terminal of the chassis power module, and the second output terminal of the charging module is connected to the power input terminal of the vehicle to be charged. The second input terminal of the charging module is connected to the power output terminal of the new energy vehicle; The input terminal of the monitoring module is connected to the output terminal of the energy storage module, the output terminal of the charging module, the output terminal of the chassis power module, the output terminal of the photovoltaic interface, and the output terminal of the grid interface, respectively. The output terminal of the monitoring module is connected to the control terminal of the energy storage module, the control terminal of the charging module, the control terminal of the chassis power module, and the control terminal of the grid interface. The chassis power module is controlled to start and move the mobile multi-port photovoltaic-energy storage-charging integrated device. The charging module includes an energy balancer. The monitoring module controls the energy balancer in the charging module to achieve energy balance control between the two new energy vehicles.

2. The mobile multi-port integrated optical storage and charging device according to claim 1, characterized in that, The energy storage module includes a first energy storage battery, a second energy storage battery, a power equalizer, a first bidirectional converter, a second bidirectional converter, a temperature sensor, a first voltage detection unit, and a first current detection unit; The first end of the first bidirectional converter is connected to the second end of the photovoltaic interface, the second end of the grid interface, and the first input end of the charging module via the DC bus. The second end of the first bidirectional converter is connected to the first energy storage battery and the first end of the power equalizer, respectively. The first end of the second bidirectional converter is connected to the second end of the photovoltaic interface, the second end of the grid interface, and the first input end of the charging module via the DC bus. The second terminal of the second bidirectional converter is connected to the second energy storage battery and the second terminal of the power equalizer, respectively. The output terminals of the temperature sensor, the first voltage detection unit, and the first current detection unit are all connected to the input terminal of the monitoring module. The control terminals of the first bidirectional converter, the second bidirectional converter, and the power equalizer are all connected to the output terminal of the monitoring module.

3. The mobile multi-port integrated optical storage and charging device according to claim 2, characterized in that, The charging module further includes a first unidirectional converter, a second unidirectional converter, a first charging gun, a second charging gun, a second voltage detection unit, and a second current detection unit; The input terminal of the first unidirectional converter is connected to the second terminal of the photovoltaic interface, the second terminal of the grid interface, the first terminal of the first bidirectional converter, and the first terminal of the second bidirectional converter via the DC bus, respectively. The output terminal of the first unidirectional converter is connected to the first terminal of the first charging gun and the first terminal of the energy converter, respectively. The second terminal of the first charging gun is connected to the power input terminal of the vehicle to be charged or the power output terminal of the new energy vehicle. The input terminal of the second unidirectional converter is connected to the second terminal of the photovoltaic interface, the second terminal of the grid interface, the first terminal of the first bidirectional converter, and the first terminal of the second bidirectional converter via the DC bus, respectively. The output terminal of the second unidirectional converter is connected to the input terminal of the chassis power module, the first terminal of the second charging gun, and the second terminal of the energy regulator, respectively. The second terminal of the second charging gun is connected to the power input terminal of the vehicle to be charged or the power output terminal of the new energy vehicle. The output terminals of the second voltage detection unit and the second current detection unit are both connected to the input terminal of the monitoring module. The control terminal of the energy regulator is connected to the output terminal of the monitoring module.

4. The mobile multi-port integrated optical storage and charging device according to claim 3, characterized in that, The photovoltaic interface includes a third unidirectional converter, a third voltage detection unit, and a third current detection unit; The input terminal of the third unidirectional converter is connected to the output terminal of the external photovoltaic module; The output terminal of the third unidirectional converter is connected to the first terminal of the first bidirectional converter, the first terminal of the second bidirectional converter, the input terminal of the first unidirectional converter, and the input terminal of the second unidirectional converter via the DC bus, respectively. The output terminals of the third voltage detection unit and the third current detection unit are both connected to the input terminal of the monitoring module.

5. The mobile multi-port integrated optical storage and charging device according to claim 4, characterized in that, The power grid interface includes a third bidirectional converter, a fourth voltage detection unit, and a fourth current detection unit; The first terminal of the third bidirectional converter is electrically connected to the external AC power grid. The second end of the third bidirectional converter is connected to the first end of the first bidirectional converter, the first end of the second bidirectional converter, the input end of the first unidirectional converter, and the input end of the second unidirectional converter via the DC bus. The output terminals of the fourth voltage detection unit and the fourth current detection unit are both connected to the input terminal of the monitoring module. The control terminal of the third bidirectional converter is connected to the output terminal of the monitoring module.

6. The mobile multi-port integrated optical storage and charging device according to claim 5, characterized in that, The monitoring module includes a data acquisition unit, a control unit, and a display unit; The input terminal of the data acquisition unit is connected to the output terminal of the temperature sensor, the output terminal of the first voltage detection unit, the output terminal of the second voltage detection unit, the output terminal of the third voltage detection unit, the output terminal of the fourth voltage detection unit, the output terminal of the first current detection unit, the output terminal of the second current detection unit, the output terminal of the third current detection unit, and the output terminal of the fourth current detection unit, respectively. The output terminal of the data acquisition unit is connected to the input terminal of the control unit, the first output terminal of the control unit is connected to the input terminal of the display unit, and the second output terminal of the control unit is connected to the control terminals of the first bidirectional converter, the second bidirectional converter, the power equalizer, the energy balancer, the third bidirectional converter, and the chassis power module, respectively.

7. A control method for a mobile multi-port integrated optical storage and charging device, characterized in that, The control method, applied to the mobile multi-port integrated optical storage and charging device as described in any one of claims 1-6, comprises: Step 1: Obtain the actual power of the photovoltaic interface, the power of the charging module, and the state of charge of the energy storage module through the monitoring module; Step 2: Determine the power control mode of the mobile multi-port photovoltaic-storage-charging integrated device based on the power of the photovoltaic interface, the power of the charging module, and the actual value of the state of charge of the energy storage module. Step 3: Generate power control commands for the energy storage module and grid interface based on the determined power control mode; Step 4: Input the power control commands of the energy storage module and the grid interface into the energy storage module and the grid interface to realize power control of the energy storage module and the grid interface.

8. The control method for the mobile multi-port integrated optical storage and charging device according to claim 7, characterized in that, The power control modes of the mobile multi-port integrated photovoltaic energy storage and charging device include: First power control mode: The input power of the photovoltaic interface is greater than the output power of the charging module, and the actual value of the state of charge of the energy storage module is less than or equal to the maximum preset threshold. The photovoltaic interface receives energy from the external photovoltaic module to power the charging module. The monitoring module stores the surplus energy by activating the energy storage module. Second power control mode: The input power of the photovoltaic interface is greater than the output power of the charging module, and the actual value of the state of charge of the energy storage module is greater than the maximum preset threshold. The photovoltaic interface receives energy from the external photovoltaic module and supplies power to the charging module. The monitoring module feeds the surplus energy into the external AC power grid by activating the grid interface. Third power control mode: The input power of the photovoltaic interface is less than the output power of the charging module, and the actual value of the state of charge of the energy storage module is greater than or equal to the minimum preset threshold. The photovoltaic interface receives energy from the external photovoltaic module. The monitoring module starts the energy storage module and controls the energy output of the energy storage module to work together with the energy connected to the photovoltaic interface to power the charging module. Fourth power control mode: When the input power of the photovoltaic interface is less than the output power of the charging module and the actual state of charge of the energy storage module is less than the minimum preset threshold, the photovoltaic interface receives energy from the external photovoltaic module. The monitoring module starts the grid interface to receive energy from the external AC grid, controls the energy received by the photovoltaic interface and the energy received by the grid interface to work together to power the charging module, and starts the energy storage module to store the surplus energy.

9. The control method for the mobile multi-port integrated optical storage and charging device according to claim 7, characterized in that, The control method further includes: The energy balancer in the charging module is controlled to achieve energy balance control between the two new energy vehicles.

10. The control method for the mobile multi-port integrated optical storage and charging device according to claim 7, characterized in that, The control method further includes: The power equalizer in the energy storage module is controlled to achieve power equalization control of the energy storage batteries in the energy storage module.

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