A charging, discharging and storing integrated bidirectional energy intelligent collaborative system and method

Abstract

The present invention belongs to the technical field of grid voltage fluctuation caused by electric vehicle load access to the grid, and in particular, relates to an integrated charging, discharging and storing bidirectional energy intelligent collaborative system and method. The system of the present invention includes an electric vehicle charging pile, a secondary battery energy storage system and an intelligent PWM multifunctional converter, which are used to detect the voltage of the integrated power station and compensate for the voltage. The present invention uses an intelligent PWM multifunctional converter to detect the state disturbance of the grid voltage, transmits the voltage disturbance signal to the model prediction voltage control unit, outputs the voltage signal to the main circuit of the intelligent PWM multifunctional converter after data processing, and transmits the signal of grid voltage reduction to the secondary battery energy storage system, so that the secondary battery energy storage system discharges, compensates the grid voltage, ensures the stable operation of the grid voltage, and ensures that the voltage fluctuation is reduced to a minimum when large-scale electric vehicles are connected to the grid, effectively ensuring voltage balance.

Description

Technical Field

[0001] The present invention belongs to the technical field of grid voltage fluctuation caused by electric vehicle load access to the grid, and in particular relates to an integrated charging, discharging and storing bidirectional energy intelligent collaborative system and method, and in particular to a method of intelligent collaborative following voltage compensation. Background Art

[0002] With the vigorous development of clean and new energy in the world, my country has launched a large number of promotion and construction of electric vehicles and charging facilities in various places. Compared with traditional single-function charging stations, battery swap stations or energy storage stations, scientific researchers have proposed an electric vehicle intelligent charging, discharging and storage integrated power station that combines charging, battery swapping and energy storage, and retired battery reuse functions. It can significantly save land resources and reduce battery use costs, laying a key foundation for promoting the development of electric vehicles.

[0003] At the same time, since electric vehicles are connected to the power grid as a disorderly large-scale charging load, the electric vehicle load is centralized and disorderly, which will cause huge fluctuations in the grid voltage. The power quality, voltage, harmonics, etc. of the grid will be greatly affected. At this time, it is necessary to detect the fluctuation of the grid voltage and compensate for it, which becomes more important.

[0004] However, traditional solutions usually require a lot of manpower and material resources, and the system has poor shock resistance and low flexibility. Summary of the invention

[0005] In view of the shortcomings of the above-mentioned prior art, the present invention provides a charging, discharging and storing integrated bidirectional energy intelligent collaborative system and method. Its purpose is to realize the real-time detection of the voltage of the charging, discharging and storing integrated power station by intelligent collaborative method, and to compensate the voltage, thereby ensuring the access of large-scale electric vehicles to the power grid, reducing the voltage fluctuation to a minimum, ensuring voltage balance, stable operation of the power grid, and fully reflecting the invention purpose of the energy storage capacity and rapid adjustment performance of the integrated power station.

[0006] The technical solutions adopted by the present invention to achieve the above-mentioned purpose are as follows:

[0007] A charging, discharging and storing integrated bidirectional energy intelligent collaborative system, including an electric vehicle charging pile, an intelligent PWM multifunctional converter and a secondary battery energy storage system; wherein the electric vehicle charging pile is connected to the system bus, the intelligent PWM multifunctional converter is connected to the system bus, and the secondary battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter; the electric vehicle charging pile includes: an AC-DC converter circuit and a DC-DC converter circuit; the intelligent PWM multifunctional converter includes: an intelligent PWM multifunctional converter main circuit, an IGBT drive circuit, a voltage acquisition circuit, a current acquisition circuit, a temperature sensor circuit, an electric vehicle charging pile communication circuit The invention relates to a circuit and an intelligent collaborative voltage following control circuit; wherein the output end of the IGBT driving circuit is connected to the gate of the IGBT in the main circuit, the voltage acquisition circuit is connected to different nodes of the main circuit, the input end of the intelligent collaborative voltage following control circuit is connected to the output end of the voltage acquisition circuit, and the output end of the intelligent collaborative voltage following control circuit is connected to the IGBT driving circuit; the cascade battery energy storage system comprises: a cascade battery unit and an integrated management unit; the output end of the data acquisition module of the integrated management unit is connected to the input end of the data processing module, the output end of the data processing module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the cascade battery unit.

[0008] Furthermore, the main circuit of the intelligent PWM multifunctional converter realizes charging of the secondary battery energy storage system by the power grid through rectification, or supplies power to the power grid with the current of the secondary battery energy storage system through inversion;

[0009] The IGBT drive circuit receives the signal from the intelligent coordinated voltage follower control circuit, triggering and controlling the main circuit of the intelligent PWM multifunctional converter;

[0010] The voltage acquisition circuit is used to collect three-phase voltage data in real time and transmit it to the intelligent coordinated voltage following control circuit;

[0011] The current acquisition circuit is used to collect three-phase current data in real time and transmit it to the intelligent coordinated voltage following control circuit;

[0012] The temperature sensing circuit is used to obtain the ambient temperature and transmit the temperature disturbance signal to the intelligent coordinated voltage following control circuit;

[0013] The electric vehicle charging pile communication circuit is used to obtain the charging quantity of the electric vehicle in different time periods, the charging current flowing through the electric vehicle, and the SOC of the electric vehicle in real time;

[0014] The intelligent collaborative voltage following control circuit includes: an intelligent collaborative voltage disturbance observation module, a model prediction voltage control module and an SVPWM waveform generation module; wherein the output end of the intelligent collaborative voltage disturbance observation module is connected to the input end of the model prediction voltage control module, and the disturbance signal is transmitted to the model prediction voltage control module, and the output end of the model prediction voltage control module is connected to the input end of the SVPWM waveform generation module; the input end of the cascade battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter; the cascade battery energy storage system and the intelligent collaborative voltage disturbance observation module realize bidirectional information flow.

[0015] Furthermore, the intelligent cooperative voltage following control system in the intelligent cooperative voltage following control circuit includes: an intelligent cooperative voltage disturbance observation module, a model prediction voltage control module and an SVPWM waveform generation module; wherein the output end of the intelligent cooperative voltage disturbance observation module is connected to the input end of the model prediction voltage control module, and the disturbance signal is transmitted to the model prediction voltage control module, and the output end of the model prediction voltage control module is connected to the input end of the SVPWM waveform generation module to generate a waveform; the input end of the cascade battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter; the cascade battery energy storage system and the intelligent cooperative voltage disturbance observation module realize bidirectional information flow;

[0016] The intelligent collaborative voltage disturbance observation module is used to obtain multiple information, including charging pile current, ambient temperature, number of electric vehicles charged, battery capacity, and voltage disturbance observation module. By processing multiple information, the module estimates the disturbance to the bus voltage, outputs the voltage disturbance signal, and transmits the voltage disturbance signal to the model prediction voltage control module;

[0017] The model prediction voltage control module is used to receive the disturbance signal output by the intelligent collaborative voltage disturbance observation module. The model prediction voltage control module estimates the system voltage and outputs the voltage signal to the SVPWM waveform generation module. The SVPWM waveform generation module outputs a PWM signal. The PWM signal triggers the main circuit through the IGBT drive circuit to realize the main circuit control of the echelon battery energy storage system. The echelon battery energy storage system discharges and compensates the bus voltage; then the bus voltage is obtained through the voltage acquisition unit and feedback is given. If the compensation makes the bus voltage balanced, the echelon battery energy storage system ends the bus voltage compensation; if the bus voltage is not balanced, the echelon battery energy storage system continues to compensate the bus voltage.

[0018] Furthermore, the integrated management unit uses a hybrid neural network to evaluate the regional battery capacity and control the discharge behavior of the cascade battery, including the following steps:

[0019] Step 1. Use the data acquisition module to collect the data information of the echelon battery, and process the data through the data processing module to obtain a data feature set;

[0020] Step 2. Design the change in battery capacity in the area. The calculation formula is as follows:

[0021] ;

[0022] in, is the battery capacity change, Discharge current from the battery, , are the starting voltage and ending voltage during the peak period;

[0023] Step 3. Based on the battery capacity change and the data feature set, using the cascade battery data information, the number of charging cycles and the average temperature, a multi-input-multi-output processing method is used to obtain an output result as a percentage of the battery capacity;

[0024] Step 4. The main circuit of the intelligent PWM multifunctional inverter outputs a voltage control signal to the echelon battery energy storage system. When the voltage control signal is transmitted to the control module of the integrated management unit of the echelon battery energy storage system, the control module determines whether the echelon battery capacity percentage continues to discharge. If the echelon battery capacity percentage supports continued discharge to compensate the bus voltage, the control module controls the echelon battery unit to discharge. If the echelon battery capacity percentage does not support discharge to compensate the bus voltage, the discharge is stopped.

[0025] A charging, discharging and storing integrated bidirectional energy intelligent coordination method is implemented by using a charging, discharging and storing integrated bidirectional energy intelligent coordination system, and the method includes:

[0026] Step 1. Obtain multivariate data information through the voltage acquisition circuit, current acquisition circuit, temperature acquisition circuit, and electric vehicle charging pile communication circuit in the intelligent PWM multifunctional converter;

[0027] Step 2. The intelligent cooperative voltage following control circuit in the intelligent PWM multifunctional converter processes the obtained multivariate data information to generate a voltage disturbance signal, performs model voltage prediction control on the disturbance signal, outputs a PWM control signal through SVPWM, and transmits the PWM control signal to the IGBT drive circuit to trigger the main circuit of the intelligent PWM multifunctional converter;

[0028] Step 3. The main circuit of the intelligent PWM multifunctional converter controls the discharge of the secondary battery energy storage system, and the secondary battery energy storage system feeds back the electric energy to the power grid;

[0029] Step 4. The voltage detection module voltage acquisition circuit of the intelligent PWM multifunctional converter obtains the bus voltage information and determines whether the voltage compensation is balanced. If the bus voltage is balanced, the echelon battery energy storage system ends the discharge; if the bus voltage is not balanced, the echelon battery continues to compensate for the bus voltage.

[0030] Furthermore, the internal operation algorithm flow of the intelligent PWM multifunctional converter includes:

[0031] Step 1. The intelligent collaborative voltage disturbance observation module collects multivariate information and sets proportional weights;

[0032] Step 2. Input the acquired data feature quantity;

[0033] Step 3. Output voltage disturbance signal to the model prediction voltage control module based on multivariate information;

[0034] Step 4. For the disturbance signal input by the intelligent collaborative voltage disturbance observer module, the system voltage state and voltage disturbance are unified and analyzed in the same dimension;

[0035] Step 5. Establish voltage cost target based on analysis results;

[0036] Step 6. Minimize the cost target and output the voltage information number.

[0037] Furthermore, when the charging, discharging and storing integrated bidirectional energy intelligent collaborative system adopts an island mode, the method includes:

[0038] Step 1. Obtain bus voltage data in real time through the voltage acquisition unit in the intelligent coordinated voltage following control circuit;

[0039] Step 2. The intelligent coordinated voltage following control circuit determines whether the bus voltage is lower than 80% of the rated voltage;

[0040] Step 3. Disconnect the transformer secondary side switch through the intelligent coordinated voltage following control circuit;

[0041] Step 4. The intelligent collaborative voltage following control circuit transmits the control signal to the integrated management unit in the cascade battery energy storage system. The control module of the integrated management unit controls the cascade battery to discharge, so that the cascade battery energy storage system can supply power to the electric vehicle load when it is disconnected from the power grid.

[0042] An integrated charging, discharging and storage bidirectional energy intelligent collaborative system, comprising:

[0043] The collection and setting module is used for the intelligent collaborative voltage disturbance observation module to collect multivariate information and set proportional weights; the multiple factors are summarized as charging pile current, ambient temperature, number of electric vehicles connected and battery capacity percentage, which are regarded as multiple feature quantities, and the proportional weights are set according to the impact of the feature quantities on the voltage;

[0044] A feature quantity acquisition module is used to input and acquire data feature quantities, and acquire data feature quantities as input according to a voltage acquisition circuit, a current acquisition circuit, a temperature acquisition circuit, and an electric vehicle charging pile communication circuit;

[0045] A processing module is used to output a voltage disturbance signal to a model prediction voltage control module based on multivariate information; data processing and iteration are performed to output a voltage disturbance signal to the model prediction voltage control module;

[0046] The analysis module is used to unify the system voltage state and voltage disturbance for the disturbance signal input by the intelligent collaborative voltage disturbance observer module and analyze them in the same dimension;

[0047] The voltage cost target establishment module is used to establish the voltage cost target according to the analysis results. The cost target takes the sum of the absolute value of the system voltage state change and the absolute value of the voltage disturbance change as the target;

[0048] The cost target minimization module is used to minimize the cost target and output the voltage information number; that is, to minimize the voltage state change, thereby minimizing the fluctuation of the bus voltage caused by the disturbance signal;

[0049] The described charging, discharging and storage integrated bidirectional energy intelligent collaborative system is used to implement the steps of any described charging, discharging and storage integrated bidirectional energy intelligent collaborative method.

[0050] A computer device comprises a storage medium, a processor and a computer program stored on the storage medium and executable on the processor, wherein when the processor executes the computer program, the steps of any one of the above-described integrated charging, discharging and storage bidirectional energy intelligent collaboration methods are implemented.

[0051] A computer storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of any one of the above-described integrated charging, discharging and storing bidirectional energy intelligent collaborative methods are implemented.

[0052] The present invention has the following beneficial effects and advantages:

[0053] The system of the present invention comprises an electric vehicle charging pile, a secondary battery energy storage system and an intelligent PWM multifunctional converter, which are used for detecting and compensating the voltage of an integrated power station.

[0054] The present invention adds an intelligent PWM multifunctional converter component, and adds an intelligent PWM multifunctional converter and a secondary battery energy storage system collaborative control method to compensate for the voltage reduction when the power grid is connected to large-scale electric vehicles. The intelligent PWM multifunctional converter can detect the state disturbance of the power grid voltage, process the disturbance information and output a signal of the reduced power grid voltage to the secondary battery energy storage system. The secondary battery energy storage system detects the signal of the reduced power grid voltage and discharges, thereby compensating the power grid voltage and ensuring that the voltage fluctuation is reduced to a minimum when large-scale electric vehicles are connected to the power grid.

[0055] The present invention also adds a method for time-sharing control of electric vehicle charging and discharging. In an island mode within a specific time period, the electric vehicle discharges to the secondary battery energy storage system to compensate for its energy consumption. In another specific time period, the electric vehicle discharges to assist the power grid in supplying power to the basic load, reducing the peak-to-valley difference of the power grid load and ensuring the stable operation of the power grid.

[0056] When a large-scale electric vehicle cluster is connected to the power grid, the grid voltage will have a large fluctuation, causing the grid voltage to decrease. The present invention uses the intelligent cooperative voltage disturbance observation unit in the intelligent cooperative voltage following controller module in the intelligent PWM multifunctional converter to detect the state disturbance of the grid voltage, and then transmits the voltage disturbance signal to the model prediction voltage control unit, and after data processing, outputs the voltage signal to the main circuit of the intelligent PWM multifunctional converter, and then transmits the signal of the grid voltage reduction to the integrated management system module in the cascade battery energy storage system, so that the cascade battery energy storage system discharges, compensates the grid voltage, ensures the stable operation of the grid voltage, and ensures that the voltage fluctuation is reduced to a minimum when large-scale electric vehicles are connected to the power grid, effectively ensuring voltage balance. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0058] Figure 1 This is a structural diagram of the charging, discharging and storing integrated bidirectional energy intelligent collaborative system of the present invention;

[0059] Figure 2 It is a structural block diagram of the intelligent PWM multifunctional converter of the present invention;

[0060] Figure 3 It is a structural block diagram of an intelligent coordinated voltage following control system of an intelligent PWM multifunctional converter intelligent coordinated voltage following control circuit of the present invention;

[0061] Figure 4 It is a flow chart of an intelligent coordinated voltage following control system method in an intelligent coordinated voltage following control circuit in an intelligent PWM multifunctional converter of the present invention;

[0062] Figure 5 It is a structural block diagram of the cascade battery energy storage system of the present invention;

[0063] Figure 6 It is a flow chart of a method for controlling bus voltage compensation by an integrated management unit in a cascade battery energy storage system of the present invention;

[0064] Figure 7 It is a flow chart of the charging, discharging and storing integrated bidirectional energy intelligent collaborative method of the present invention;

[0065] Figure 8 It is a flow chart of the island mode method of the charging, discharging and storing integrated bidirectional energy intelligent collaborative system of the present invention;

[0066] Fig. 9 It is a flow chart of the time period control method of the integrated charging, discharging and storing bidirectional energy intelligent collaborative system of the present invention. DETAILED DESCRIPTION

[0067] In order to more clearly understand the above-mentioned objectives, features and advantages of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0068] 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.

[0069] Refer to the following Figure 1-Figure 9 The technical solutions of some embodiments of the present invention are described.

[0070] Example 1

[0071] The present invention provides an embodiment, which is a bidirectional energy intelligent coordination system integrating charging, discharging and storage. Specifically, it is a bidirectional energy intelligent coordination system integrating charging, discharging and storage of electric vehicles, such as Figure 1 As shown, Figure 1 It is a structural block diagram of the charging, discharging and storing integrated bidirectional energy intelligent collaborative system of the present invention.

[0072] The system of the present invention includes three module systems: an electric vehicle charging pile, an intelligent PWM multifunctional converter and a secondary battery energy storage system; wherein the electric vehicle charging pile is connected to the system bus, the intelligent PWM multifunctional converter is connected to the system bus, and the secondary battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter.

[0073] The electric vehicle charging pile includes an AC-DC converter circuit and a DC-DC converter circuit. The charging pile is used to enable the power grid to charge the connected electric vehicle; the electric vehicle charging pile can feed back the electric energy of the electric vehicle to the power grid through the existing V2G technology.

[0074] The electric vehicle charging pile has two operating modes. In mode 1, the AC-DC converter is in a rectifying state, at which time the DC-DC converter reduces the rectified voltage value to the required value of the electric vehicle battery to charge the electric vehicle battery; in mode 2, the AC-DC converter is in an inverter state, and the DC-DC converter is in a boost state, raising the voltage of the electric vehicle battery to the required value of the power grid, and at this time the electric vehicle serves as a power source to supply power to the power grid.

[0075] like Figure 2 As shown, Figure 2 This is a structural block diagram of the intelligent PWM multifunctional converter of the present invention, and the intelligent PWM multifunctional converter includes: an intelligent PWM multifunctional converter main circuit, an IGBT drive circuit, a voltage acquisition circuit, a current acquisition circuit, a temperature sensor circuit, an electric vehicle charging pile communication circuit and an intelligent collaborative voltage following control circuit. The output end of the IGBT drive circuit is connected to the gate of the IGBT in the main circuit to control its opening and closing, the voltage acquisition circuit is connected to different nodes of the main circuit, and the current acquisition circuit is connected to different branches of the main circuit to detect input current or output current; the input end of the intelligent collaborative voltage following control circuit is connected to the output end of the voltage acquisition circuit, and the output end of the intelligent collaborative voltage following control circuit is connected to the IGBT drive circuit for controlling the main circuit.

[0076] Among them, the main circuit of the intelligent PWM multifunctional converter realizes the grid charging the secondary battery energy storage system through rectification, or supplies power to the grid from the current of the secondary battery energy storage system through inversion.

[0077] The IGBT drive circuit receives the signal of the intelligent coordinated voltage following control circuit, and triggers and controls the main circuit of the intelligent PWM multifunctional converter.

[0078] The voltage acquisition circuit is used to collect three-phase voltage data in real time and transmit it to the intelligent coordinated voltage following control circuit.

[0079] The current acquisition circuit is used to collect three-phase current data in real time and transmit it to the intelligent coordinated voltage following control circuit.

[0080] The temperature sensing circuit is used to obtain the ambient temperature and transmit the temperature disturbance signal to the intelligent coordinated voltage following control circuit.

[0081] The electric vehicle charging pile communication circuit is used to obtain the charging quantity of the electric vehicle in different time periods, the charging current flowing through the electric vehicle, and the SOC of the electric vehicle in real time. The electric vehicle charging pile communication circuit is in the charging pile and communicates with the charging pile.

[0082] The intelligent collaborative voltage following control circuit includes: an intelligent collaborative voltage disturbance observation module, a model prediction voltage control module and an SVPWM waveform generation module. The output end of the intelligent collaborative voltage disturbance observation module, the model prediction voltage control module and the SVPWM waveform generation module are all in a chip control board without electrical connection. The input end of the cascade battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter, which is an electrical connection; and the connection between the cascade battery energy storage system and the intelligent collaborative voltage disturbance observation module realizes the bidirectional flow of information.

[0083] The intelligent cooperative voltage following control circuit is connected to the IGBT driving circuit, specifically, the output end of the intelligent cooperative voltage following control circuit is connected to the input end of the IGBT driving circuit to control the triggering of the main circuit. The control signal is transmitted to the IGBT driving circuit, and the IGBT driving circuit receives the control signal to control the main circuit of the intelligent PWM multifunctional converter.

[0084] The intelligent collaborative voltage following control circuit is used to detect the disturbance changes in the grid voltage caused by the connection of electric vehicles to the grid. According to the grid voltage disturbance change signal obtained by real-time detection, the PWM signal is output and transmitted to the IGBT drive circuit, triggering the main circuit of the intelligent PWM multi-functional converter, and then controlling the charging and discharging of the cascade battery energy storage system.

[0085] like Figure 3 As shown, Figure 3 It is a structural block diagram of an intelligent coordinated voltage following control system of an intelligent PWM multifunctional converter intelligent coordinated voltage following control circuit of the present invention.

[0086] The intelligent collaborative voltage following control system in the intelligent collaborative voltage following control circuit includes: intelligent collaborative voltage disturbance observation module, model prediction voltage control module and SVPWM waveform generation module. The output end of the intelligent collaborative voltage disturbance observation module, the model prediction voltage control module and the SVPWM waveform generation module are all in a chip control board without electrical connection. The input end of the cascade battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter, which is an electrical connection; and the connection between the cascade battery energy storage system and the intelligent collaborative voltage disturbance observation module realizes the two-way flow of information.

[0087] The intelligent collaborative voltage disturbance observation module is used to obtain multiple information, including charging pile current, ambient temperature, number of electric vehicles charged, battery capacity, and voltage disturbance observation module. By processing multiple information, the module estimates the disturbance to the bus voltage, outputs the voltage disturbance signal, and transmits the voltage disturbance signal to the model prediction voltage control module.

[0088] The model prediction voltage control module receives the disturbance signal output by the intelligent collaborative voltage disturbance observation module, estimates the system voltage, and outputs the voltage signal to the SVPWM waveform generation module. The SVPWM waveform generation module outputs a PWM signal, and the PWM signal triggers the main circuit through the IGBT drive circuit, so that the main circuit controls the echelon battery energy storage system, and the echelon battery energy storage system discharges to compensate for the bus voltage; then the bus voltage is obtained through the voltage acquisition unit and feedback is given. If the compensation makes the bus voltage balanced, the echelon battery energy storage system ends the bus voltage compensation; if the bus voltage is not balanced, the echelon battery energy storage system continues to compensate for the bus voltage.

[0089] like Figure 5 As shown, Figure 5 The present invention is a structural block diagram of the secondary battery energy storage system. The secondary battery energy storage system includes a secondary battery unit and an integrated management unit. The output end of the data acquisition module of the integrated management unit in the secondary battery energy storage system is connected to the input end of the data processing module, the output end of the data processing module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the secondary battery unit to control the secondary battery unit, thereby controlling the discharge of the secondary battery unit and compensating the power grid.

[0090] The secondary battery unit includes various types of batteries, generally phosphate batteries, lithium-ion batteries and ternary batteries, etc. The secondary battery unit is used to obtain power from the grid and store the power from the grid. The secondary battery unit reversely compensates the grid power through the intelligent PWM multi-function converter. The integrated management unit evaluates the battery capacity of the secondary battery, controls the charging and discharging of the battery, and then reasonably compensates the grid voltage.

[0091] The integrated management unit includes a data acquisition module, a data processing module and a control module. The integrated management unit is used to evaluate the battery capacity of the echelon battery, control the charging and discharging of the echelon battery, and then balance the bus voltage.

[0092] Example 2

[0093] The present invention further provides an embodiment, which is a charging, discharging and storing integrated bidirectional energy intelligent collaborative system, comprising:

[0094] The collection and setting module is used for the intelligent collaborative voltage disturbance observation module to collect multivariate information and set proportional weights; the multiple factors are summarized as charging pile current, ambient temperature, number of electric vehicles connected and battery capacity percentage, which are regarded as multiple feature quantities, and the proportional weights are set according to the impact of the feature quantities on the voltage;

[0095] A feature quantity acquisition module is used to input and acquire data feature quantities, and acquire data feature quantities as input according to a voltage acquisition circuit, a current acquisition circuit, a temperature acquisition circuit, and an electric vehicle charging pile communication circuit;

[0096] A processing module is used to output a voltage disturbance signal to a model prediction voltage control module based on multivariate information; data processing and iteration are performed to output a voltage disturbance signal to the model prediction voltage control module;

[0097] The analysis module is used to unify the system voltage state and voltage disturbance for the disturbance signal input by the intelligent collaborative voltage disturbance observer module and analyze them in the same dimension;

[0098] The voltage cost target establishment module is used to establish the voltage cost target. The cost target can take the sum of the absolute value of the system voltage state change and the absolute value of the voltage disturbance change as the target;

[0099] The cost target minimization module is used to minimize the cost target and output the voltage information signal; that is, to minimize the voltage state change, thereby minimizing the fluctuation of the bus voltage caused by the disturbance signal.

[0100] The described charging, discharging and storage integrated bidirectional energy intelligent collaborative system is used to implement the steps of a charging, discharging and storage integrated bidirectional energy intelligent collaborative method as described in Examples 3-8.

[0101] Example 3

[0102] The present invention further provides an embodiment, which is a charging, discharging and storing integrated bidirectional energy intelligent coordination method, which is implemented using a charging, discharging and storing integrated bidirectional energy intelligent coordination system as described in Example 1.

[0103] like Figure 4 As shown, Figure 4 It is a flow chart of an intelligent coordinated voltage following control system method in an intelligent coordinated voltage following control circuit of an intelligent PWM multifunctional converter of the present invention, and the method comprises the following steps:

[0104] Step 1. The intelligent collaborative voltage disturbance observation module collects multivariate information and sets proportional weights.

[0105] The multiple factors are summarized as charging pile current, ambient temperature, number of connected electric vehicles and battery capacity percentage, which are regarded as multiple feature quantities, and the proportional weights are set according to the influence of the feature quantities on the voltage;

[0106] Step 2: Input the acquired data feature quantity.

[0107] Acquire data feature quantities as inputs according to the voltage acquisition circuit, the current acquisition circuit, the temperature acquisition circuit, and the electric vehicle charging pile communication circuit;

[0108] Step 3. Output voltage disturbance signal to the model prediction voltage control module based on multivariate information.

[0109] Data is processed and iterated, and voltage disturbance signals are output to the model prediction voltage control module;

[0110] Step 4. For the disturbance signal input by the intelligent collaborative voltage disturbance observer module, the system voltage state and voltage disturbance are unified and analyzed in the same dimension;

[0111] Step 5. According to the analysis results, establish a voltage cost target. The cost target can be the sum of the absolute value of the system voltage state change and the absolute value of the voltage disturbance change as the target;

[0112] Step 6. Minimize the cost target and output the voltage information number. That is, minimize the voltage state change, thereby minimizing the fluctuation of the bus voltage caused by the disturbance signal.

[0113] Example 4

[0114] The present invention further provides an embodiment, which is a charging, discharging and storing integrated bidirectional energy intelligent coordination method, which is implemented using a charging, discharging and storing integrated bidirectional energy intelligent coordination system as described in Example 1.

[0115] like Figure 6 As shown, Figure 6 It is a flow chart of a method for controlling bus voltage compensation by an integrated management unit in a cascade battery energy storage system of the present invention;

[0116] The integrated management unit in the cascade battery energy storage system uses a hybrid neural network to evaluate the regional battery capacity and control the discharge behavior of the cascade battery, including the following steps:

[0117] Step 1. Use the data acquisition module to collect the data information of the echelon battery, and obtain the data feature set after processing. The echelon battery data information includes: use temperature, starting voltage, ending voltage, average current, start charging SOC and stop charging SOC, the number of times the echelon battery is used and the average temperature, etc. The data is processed by the data processing module to obtain the data feature set.

[0118] Step 2. Design the change in battery capacity in the area. The calculation formula is as follows:

[0119] ;

[0120] in, is the battery capacity change, Discharge current from the battery, , are the starting voltage and ending voltage during the peak period.

[0121] Step 3. Based on the battery capacity change and the data feature set, using the cascade battery data information, the number of charging cycles and the average temperature, the existing multi-input-multi-output processing method is used to obtain the output result as the battery capacity percentage.

[0122] Specifically, the battery capacity percentage is obtained by processing the battery capacity change obtained in step 2 and a data feature set composed of multiple factors.

[0123] The cascade battery data information includes: operating temperature, average current, and start charging SOC and stop charging SOC data.

[0124] Step 4. The main circuit of the intelligent PWM multifunctional inverter outputs a voltage control signal to the echelon battery energy storage system. When the voltage control signal is transmitted to the control module of the integrated management unit of the echelon battery energy storage system, the control module determines whether the echelon battery capacity percentage can continue to discharge. If the echelon battery capacity percentage can support continued discharge to compensate the bus voltage, the control module controls the echelon battery unit to discharge. If the echelon battery capacity percentage does not support discharge to compensate the bus voltage, the discharge is stopped.

[0125] Example 5

[0126] The present invention further provides an embodiment, which is a charging, discharging and storing integrated bidirectional energy intelligent coordination method, which is implemented using a charging, discharging and storing integrated bidirectional energy intelligent coordination system as described in Example 1.

[0127] like Figure 7 As shown, Figure 7 It is a flow chart of the charging, discharging and storing integrated bidirectional energy intelligent collaborative method of the electric vehicle of the present invention. The difference between this embodiment and embodiment 2 is that embodiment 2 emphasizes the specific working process of the intelligent PWM multifunctional converter, that is, the algorithm process steps of the internal operation of the intelligent PWM multifunctional converter; while this example highlights the entire method steps of the working of the entire charging, discharging and storing integrated bidirectional energy intelligent collaborative system, including the intelligent collaborative regulation of the grid voltage by the intelligent PWM multifunctional converter and the cascade battery energy storage system.

[0128] The charging, discharging and storing integrated bidirectional energy intelligent coordination method of an electric vehicle of the present invention specifically comprises the following steps:

[0129] Step 1. Obtain multivariate data information through the voltage acquisition circuit, current acquisition circuit, temperature acquisition circuit, and electric vehicle charging pile communication circuit in the intelligent PWM multifunctional converter;

[0130] Step 2. The intelligent cooperative voltage following control circuit in the intelligent PWM multifunctional converter processes the obtained multivariate data information to generate a voltage disturbance signal, and then performs model voltage prediction control on the output voltage signal according to the disturbance signal, outputs a PWM control signal through SVPWM, and the PWM control signal is transmitted to the IGBT drive circuit to trigger the main circuit of the intelligent PWM multifunctional converter;

[0131] Step 3. The main circuit of the intelligent PWM multifunctional converter controls the discharge of the secondary battery energy storage system, and the secondary battery energy storage system feeds back the electric energy to the power grid;

[0132] Step 4. The voltage detection module voltage acquisition circuit of the intelligent PWM multifunctional converter obtains the bus voltage information and determines whether the voltage compensation is balanced. If the bus voltage is balanced, the echelon battery energy storage system ends the discharge; if the bus voltage is not balanced, the echelon battery continues to compensate for the bus voltage.

[0133] Example 6

[0134] Based on the same inventive concept, the present invention further provides an embodiment, which is an integrated charging, discharging and storage bidirectional energy intelligent coordination method, which is implemented using an integrated charging, discharging and storage bidirectional energy intelligent coordination system as described in Example 1.

[0135] The embodiment of the present invention provides an island mode method for an integrated charging, discharging and storing bidirectional energy intelligent collaborative system, such as Figure 8 As shown, Figure 8 This is a flow chart of the method for implementing the island mode of the integrated bidirectional energy intelligent cooperative system for electric vehicles of the present invention. The steps for implementing the island mode method of the integrated bidirectional energy intelligent cooperative system for charging, discharging and storing are as follows:

[0136] Step 1. Obtain bus voltage data in real time through the voltage acquisition unit in the intelligent coordinated voltage following control circuit;

[0137] Step 2. The intelligent coordinated voltage following control circuit determines whether the bus voltage is lower than 80% of the rated voltage;

[0138] Step 3. Disconnect the transformer secondary side switch through the intelligent coordinated voltage following control circuit;

[0139] Step 4. The intelligent collaborative voltage following control circuit transmits the control signal to the integrated management unit in the cascade battery energy storage system. The control module of the integrated management unit controls the cascade battery to discharge, so that the cascade battery energy storage system can supply power to the electric vehicle load when it is disconnected from the power grid.

[0140] Example 7

[0141] The present invention further provides an embodiment, which is a charging, discharging and storing integrated bidirectional energy intelligent coordination method, which is implemented using a charging, discharging and storing integrated bidirectional energy intelligent coordination system as described in Example 1.

[0142] Based on the same inventive concept, the embodiment of the present invention also provides a time-sharing control method for an integrated charging, discharging and storing bidirectional energy intelligent collaborative system, such as Fig. 9 As shown, Fig. 9 It is a flow chart of the time period control method of the integrated charging, discharging and storing bidirectional energy intelligent cooperative system of the electric vehicle of the present invention.

[0143] The integrated charging, discharging and storage bidirectional energy intelligent collaborative system can realize time-sharing control. The control method steps are as follows:

[0144] Step 1. Divide the daily time period into two time periods, namely: the first time period time1-time2 and the second time period time2-time3. Input the time period information into the intelligent coordinated voltage following control circuit. Among them, time1 and time2 are the times set in 00:00-24:00.

[0145] Step 2. Obtain bus voltage data in real time through the voltage acquisition unit in the intelligent coordinated voltage following control circuit;

[0146] Step 3. Determine whether the bus voltage is lower than 80% of the rated voltage. If it is lower than 80% of the rated voltage, proceed to step 4; if it is higher than 80% of the rated voltage, proceed to step 5.

[0147] Step 4. Case 1: The charging load is in the first period, and the charging, discharging and storage integrated bidirectional energy intelligent collaborative system realizes the island mode;

[0148] Case 2: When the charging load is in the second period, the integrated bidirectional energy intelligent collaborative system uses the cascade battery energy storage system to compensate for the bus voltage until a stable voltage balance is achieved.

[0149] Step 5. Case 1: When the charging load is in the first period, the integrated charging, discharging and storage bidirectional energy intelligent collaborative system uses the cascade battery energy storage system to compensate the bus voltage until a stable voltage balance is achieved;

[0150] Case 2: When the charging load is in the second period, the electric vehicle is regarded as a power source and uses V2G technology to feed back electric energy to compensate for the grid voltage until a stable voltage balance is achieved.

[0151] Example 8

[0152] Based on the same inventive concept, an embodiment of the present invention further provides a computer device, including a storage medium, a processor, and a computer program stored on the storage medium and executable on the processor. When the processor executes the computer program, the steps of any one of the charging, discharging and storing integrated bidirectional energy intelligent collaboration methods described in embodiments 3-7 are implemented.

[0153] Example 9

[0154] Based on the same inventive concept, an embodiment of the present invention also provides a computer storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of any one of the integrated charging, discharging and storage bidirectional energy intelligent collaborative methods described in Examples 3-7 are implemented.

[0155] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0156] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0157] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0158] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0159] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A charging, discharging and storing integrated bidirectional energy intelligent coordination method, characterized by: The invention is realized by using a charging, discharging and storing integrated bidirectional energy intelligent collaborative system, the system includes a cascade battery energy storage system, the cascade battery energy storage system includes: a cascade battery unit and an integrated management unit; its characteristics are: including an electric vehicle charging pile and an intelligent PWM multifunctional converter; wherein the electric vehicle charging pile is connected to the system bus, the intelligent PWM multifunctional converter is connected to the system bus, and the cascade battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter; the electric vehicle charging pile includes: an AC-DC converter circuit and a DC-DC converter circuit; the intelligent PWM multifunctional converter includes: an intelligent PWM multifunctional converter main circuit, an IGBT drive circuit The circuit comprises a voltage acquisition circuit, a current acquisition circuit, a temperature sensing circuit, an electric vehicle charging pile communication circuit and an intelligent collaborative voltage following control circuit; wherein the output end of the IGBT driving circuit is connected to the gate of the IGBT in the main circuit, the voltage acquisition circuit is connected to different nodes of the main circuit, the input end of the intelligent collaborative voltage following control circuit is connected to the output end of the voltage acquisition circuit, and the output end of the intelligent collaborative voltage following control circuit is connected to the IGBT driving circuit; the output end of the data acquisition module of the integrated management unit is connected to the input end of the data processing module, the output end of the data processing module is connected to the input end of the control module, and the output end of the control module is connected to the input end of the secondary battery unit; The main circuit of the intelligent PWM multifunctional converter realizes charging of the secondary battery energy storage system by the power grid through rectification, or supplies power to the power grid with the current of the secondary battery energy storage system through inversion; the IGBT drive circuit receives the signal of the intelligent coordinated voltage following control circuit, triggers and controls the main circuit of the intelligent PWM multifunctional converter; the voltage acquisition circuit is used to collect three-phase voltage data in real time and transmit it to the intelligent coordinated voltage following control circuit; the current acquisition circuit is used to collect three-phase current data in real time and transmit it to the intelligent coordinated voltage following control circuit; the temperature sensing circuit is used to obtain the ambient temperature and transmit the temperature disturbance signal to the intelligent coordinated voltage following control circuit; the electric vehicle charging pile communication circuit is used to obtain the charging quantity of the electric vehicle in different time periods and the charging current flowing through the electric vehicle and the SOC of the electric vehicle in real time; The intelligent cooperative voltage following control circuit includes: an intelligent cooperative voltage disturbance observation module, a model prediction voltage control module and an SVPWM waveform generation module; wherein the output end of the intelligent cooperative voltage disturbance observation module is connected to the input end of the model prediction voltage control module, and the disturbance signal is transmitted to the model prediction voltage control module, and the output end of the model prediction voltage control module is connected to the input end of the SVPWM waveform generation module; the input end of the cascade battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter; the cascade battery energy storage system and the intelligent cooperative voltage disturbance observation module realize bidirectional information flow; The intelligent cooperative voltage following control system in the intelligent cooperative voltage following control circuit includes: an intelligent cooperative voltage disturbance observation module, a model prediction voltage control module and an SVPWM waveform generation module; wherein the output end of the intelligent cooperative voltage disturbance observation module is connected to the input end of the model prediction voltage control module, and the disturbance signal is transmitted to the model prediction voltage control module, and the output end of the model prediction voltage control module is connected to the input end of the SVPWM waveform generation module to generate a waveform; the input end of the cascade battery energy storage system is connected to the main circuit of the intelligent PWM multifunctional converter; the cascade battery energy storage system and the intelligent cooperative voltage disturbance observation module realize bidirectional information flow; The intelligent collaborative voltage disturbance observation module is used to obtain multiple information, including charging pile current, ambient temperature, number of electric vehicles charged, battery capacity, and voltage disturbance observation module. By processing multiple information, the module estimates the disturbance to the bus voltage, outputs the voltage disturbance signal, and transmits the voltage disturbance signal to the model prediction voltage control module; The model prediction voltage control module is used to receive the disturbance signal output by the intelligent collaborative voltage disturbance observation module. The model prediction voltage control module estimates the system voltage and outputs the voltage signal to the SVPWM waveform generation module. The SVPWM waveform generation module outputs a PWM signal. The PWM signal triggers the main circuit through the IGBT drive circuit to realize the main circuit control of the echelon battery energy storage system. The echelon battery energy storage system discharges and compensates the bus voltage; then the bus voltage is obtained through the voltage acquisition unit and feedback is given. If the compensation makes the bus voltage balanced, the echelon battery energy storage system ends the bus voltage compensation; if the bus voltage is not balanced, the echelon battery energy storage system continues to compensate the bus voltage; The integrated management unit uses a hybrid neural network to evaluate the regional battery capacity and control the discharge behavior of the cascade battery, including the following steps: Step 1. Use a data acquisition module to collect cascade battery data information, and process the data through a data processing module to obtain a data feature set; Step 2. Design the regional battery capacity change, and the calculation formula is as follows: Among them, C′ r (τ) is the battery capacity change, I(t) is the battery discharge current, t(V′1), t(V′2) are the starting voltage and ending voltage during the peak period; Step 3. According to the battery capacity change and the data feature set, the echelon battery data information, the number of charging cycles and the average temperature are used to obtain the output result as the battery capacity percentage using the multi-input-multi-output processing method; Step 4. The main circuit of the intelligent PWM multifunctional inverter outputs a voltage control signal to the echelon battery energy storage system. When the voltage control signal is transmitted to the control module of the integrated management unit of the echelon battery energy storage system, the control module determines whether the echelon battery capacity percentage continues to discharge. If the echelon battery capacity percentage supports continued discharge to compensate the bus voltage, the control module controls the echelon battery unit to discharge. If the echelon battery capacity percentage does not support discharge to compensate the bus voltage, the discharge is stopped; A charging, discharging and storing integrated bidirectional energy intelligent coordination method comprises: step 1. obtaining multivariate data information through a voltage acquisition circuit, a current acquisition circuit, a temperature acquisition circuit and an electric vehicle charging pile communication circuit in an intelligent PWM multifunctional converter; step 2. an intelligent coordinated voltage following control circuit in the intelligent PWM multifunctional converter processes the obtained multivariate data information to generate a voltage disturbance signal, performs model voltage prediction and controls the output voltage signal according to the disturbance signal, outputs a PWM control signal through SVPWM, and the PWM control signal is transmitted to an IGBT drive circuit to trigger the main circuit of the intelligent PWM multifunctional converter; step 3. the main circuit of the intelligent PWM multifunctional converter controls the discharge of a cascade battery energy storage system, and the cascade battery energy storage system feeds electric energy back to the power grid; step 4. a voltage acquisition circuit of a voltage detection module of the intelligent PWM multifunctional converter obtains bus voltage information and determines whether the voltage is compensated and balanced. If the bus voltage is balanced, the cascade battery energy storage system ends discharging; if the bus voltage is not balanced, the cascade battery continues to compensate for the bus voltage; The internal operation algorithm flow of the intelligent PWM multifunctional converter includes: step 1. the intelligent cooperative voltage disturbance observation module collects multivariate information and sets proportional weights; step 2. inputs the acquired data feature quantity; step 3. outputs the voltage disturbance signal to the model prediction voltage control module based on the multivariate information; step 4. for the disturbance signal input by the intelligent cooperative voltage disturbance observer module, unifies the system voltage state and the voltage disturbance, and analyzes them in the same dimension; step 5. according to the analysis results, establishes the voltage cost target; step 6. minimizes the cost target and outputs the voltage information number; When the described charging, discharging and storing integrated bidirectional energy intelligent cooperative system adopts the island mode, a charging, discharging and storing integrated bidirectional energy intelligent cooperative method includes: step 1. acquiring bus voltage data in real time through the voltage acquisition unit in the intelligent cooperative voltage following control circuit; step 2. the intelligent cooperative voltage following control circuit determines whether the bus voltage is lower than 80% of the rated voltage; step 3. disconnecting the secondary side switch of the transformer through the intelligent cooperative voltage following control circuit; step 4. the intelligent cooperative voltage following control circuit transmits the control signal to the integrated management unit in the cascade battery energy storage system, and the control module of the integrated management unit controls the cascade battery to discharge, so that the cascade battery energy storage system can supply power to the electric vehicle load when it is disconnected from the power grid.

2. According to claim 1, a charging, discharging and storing integrated bidirectional energy intelligent coordination method is characterized by: The charging, discharging and storing integrated bidirectional energy intelligent collaborative system comprises: The collection and setting module is used for the intelligent coordinated voltage disturbance observation module to collect multivariate information and set proportional weights; the multiple factors are summarized as charging pile current, ambient temperature, number of electric vehicles connected and battery capacity percentage, which are regarded as multiple feature quantities, and the proportional weights are set according to the impact of the feature quantities on the voltage; A feature quantity acquisition module is used to input and acquire data feature quantities, and acquire data feature quantities as input according to a voltage acquisition circuit, a current acquisition circuit, a temperature acquisition circuit, and an electric vehicle charging pile communication circuit; A processing module is used to output a voltage disturbance signal to a model prediction voltage control module based on multivariate information; data processing and iteration are performed to output a voltage disturbance signal to the model prediction voltage control module; The analysis module is used to unify the system voltage state and voltage disturbance for the disturbance signal input by the intelligent collaborative voltage disturbance observer module and analyze them in the same dimension; The voltage cost target establishment module is used to establish the voltage cost target according to the analysis results. The cost target takes the sum of the absolute value of the system voltage state change and the absolute value of the voltage disturbance change as the target; The cost target minimization module is used to minimize the cost target and output the voltage information number; that is, to minimize the voltage state change, thereby minimizing the fluctuation of the bus voltage caused by the disturbance signal; The described charging, discharging and storage integrated bidirectional energy intelligent collaborative system is used to implement the steps of the charging, discharging and storage integrated bidirectional energy intelligent collaborative method described in claim 1.

3. A computer device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the integrated charging, discharging and storage bidirectional energy intelligent coordination method described in claim 1 are implemented.

4. A computer storage medium, characterized in that: The computer storage medium stores a computer program, which, when executed by a processor, implements the steps of the integrated charging, discharging and storage bidirectional energy intelligent collaboration method described in claim 1.

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