Multi-functional interface mobile energy storage vehicle and control system thereof

Abstract

The application belongs to the field of mobile energy storage power supply, and provides a multifunctional interface mobile energy storage vehicle and a control system thereof, which comprises a vehicle body and a gun head recognition interface, an energy storage circuit assembly is arranged in the vehicle body, and the gun head recognition interface is connected with the energy storage circuit assembly in the vehicle body; wherein the energy storage circuit assembly comprises a main controller and a vehicle pile switching switch, the main controller is connected with the interface; the main controller is also connected with the vehicle pile switching switch through a first detection point, the vehicle pile switching switch realizes the switching of the mobile energy storage vehicle to the mobile energy storage charging pile through the connection port of the adjusting switch; and the vehicle pile switching switch is also connected with the gun head recognition interface. The application analyzes the double-head gun plug-in state recognition principle and the discrimination method, and designs the vehicle / pile switching function and the anti-reverse connection function under the condition of meeting the national standard.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of mobile energy storage power supply, and particularly relates to a mobile energy storage vehicle with a multifunctional interface and a control system thereof. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] With the rapid development of modern society, the dependence of production and life on electric energy is increasing, and the demand for electric power is growing. Sudden power interruption will disrupt the normal life order of people, the normal operation of society and the production of enterprises, and even cause economic losses that cannot be ignored.

[0004] As a common emergency power supply equipment of the modern power system, the mobile energy storage vehicle plays an important role in power guarantee in some important occasions, such as high school power protection, rescue and disaster relief, power repair, etc. It is more suitable for important power protection sites such as domestic and international major conferences and activities. The emergency application in various occasions promotes the rapid development of the modern mobile energy storage power supply industry.

[0005] The main research of mobile energy storage in domestic and foreign literature is focused on energy storage conversion control algorithm, fast switching, and topology structure. Sun Weiqing et al. proposed a dynamic reconstruction and mobile energy storage optimization method for power distribution network under the background of high proportion of renewable energy, which realizes the dynamic optimization of power grid and mobile energy storage. Du Zhaobin et al. proposed a mobile power supply UPS battery optimization configuration model, which realizes the power guarantee function. Chen Zhong et al. considered the charging and discharging scheduling strategy of electric vehicles with mobile energy storage characteristics, and proposed a charging and discharging scheduling strategy for electric vehicles. According to the actual application of emergency power supply, Pei Chunmei et al. provided three topologies of series, parallel and double circuit. Lin Hanping et al. proposed an online power supply mode for emergency power supply, and Yang Yiyun et al. designed an intelligent energy storage type emergency power supply system. The design of battery management system, energy transfer type equalization principle and automatic switching technology of dual power supply are described, which realizes the functions of intelligent charging and discharging, integrated monitoring and protection. Mu Y F et al. studied the effect of electric vehicles participating in primary frequency modulation for the UK power system. Ota Y et al., Liu H et al. all proposed a distributed V2G primary frequency modulation control strategy, which provides distributed rotating standby according to the charging demand of electric vehicles and considers the frequency deviation of access point. Galus M D et al. proposed a method of tracking secondary frequency modulation signal by cluster EV and distributed heat and power generator set, which realizes the control distribution of participating units through model predictive control strategy. Masuta T et al. proposed a method of distributing load frequency control signal according to capacity and response speed to coordinate EVs and heat pumps to participate in frequency modulation control. Li Ming et al. carried out key technology research on wind-light-diesel-storage complementary power generation energy vehicle system, combined small wind power generation system, photovoltaic power generation system and energy storage system with diesel generator set, which realizes the supply of clean energy to a certain extent and increases the effective use time of mobile power supply system.

[0006] However, there are few studies on mobile energy storage interface at home and abroad, and there are some literature on the interface of diesel generator system (vehicle) into the network, such as Chen Renpeng et al. and Zhang Hua et al. proposed an emergency power supply interface device, which is a docking interface connecting low-voltage power supply bus system and emergency diesel generator car, used to achieve fast, safe and flexible plug-in connection between emergency diesel generator car and low-voltage power supply bus system, which belongs to AC interface connection. However, there are few descriptions of DC interface of charging pile and interface of mobile energy storage vehicle.

[0007] With the popularity of electric vehicles and charging piles, mobile energy storage vehicles bear more and more functions, such as emergency rescue, emergency charging, emergency lighting, etc., which puts forward more requirements for interface flexibility, convenience and plug and play. SUMMARY

[0008] In order to solve the above problems, the application provides a mobile energy storage vehicle with a multifunctional interface and a control system thereof, and the mobile energy storage vehicle can be timely charged by using the existing charging piles in the society, and the new energy vehicles can be supplied with emergency power in the traffic rush hours and emergency periods, especially in the charging peak of electric vehicles on the highway during holidays, the mobile energy storage vehicle can be used as a charging pile and has the functions of reactive power compensation, harmonic control and imbalance control.

[0009] According to some embodiments, the first aspect of the application provides a mobile energy storage vehicle with a multifunctional interface, which adopts the following technical solutions:

[0010] The mobile energy storage vehicle with a multifunctional interface comprises a vehicle body and a gun head recognition interface, and the vehicle body is provided with an energy storage circuit assembly; the gun head recognition interface is connected with the energy storage circuit assembly in the vehicle body.

[0011] The energy storage circuit assembly comprises a main controller and a vehicle pile switching switch, the main controller is connected with the gun head recognition interface; the main controller is also connected with the vehicle pile switching switch through a first detection point, and the vehicle pile switching switch realizes the switching of the mobile energy storage vehicle to the mobile energy storage charging pile through the connection port of the adjusting switch.

[0012] The vehicle pile switching switch is also connected with the gun head recognition interface.

[0013] Further, the energy storage circuit assembly further comprises a vehicle-mounted charger, a current transformer and a vehicle-mounted battery, the vehicle-mounted charger is connected with the main controller through the vehicle-mounted battery; the vehicle-mounted charger is connected with the current transformer through a high-frequency transformer.

[0014] The vehicle-mounted charger, the current transformer and the vehicle-mounted battery are all connected with the main controller and controlled by the main controller.

[0015] Further, the vehicle-mounted charger is connected with the positive and negative lines of the direct current power supply of the gun head recognition interface through a bleeder circuit.

[0016] Further, the gun head recognition interface is also connected with a double-head charging gun, the double-head charging gun is also connected with an electric vehicle through a charging interface; the gun head recognition interface is also connected with a direct current charging pile through the double-head charging gun.

[0017] The double-head charging gun comprises a first gun port, a connecting line and a second gun port, the first gun port is connected with the gun head recognition interface; the second gun port is connected with the charging interface.

[0018] Further, the energy storage circuit assembly further comprises a control power supply, the control power supply is connected with the main controller, and the control power supply is also connected with the gun head recognition interface.

[0019] Further, the vehicle-pile switching switch comprises a vehicle contact and a pile contact, and the gun head recognition interface is provided with a first contact and a second contact; the pile contact is connected to the first contact, and the vehicle contact is connected to the second contact.

[0020] According to some embodiments, a second aspect of the present application provides a control system of a mobile energy storage vehicle with a multifunctional interface, which adopts the following technical solution:

[0021] A control system of a mobile energy storage vehicle with a multifunctional interface comprises:

[0022] An initialization module is configured to initialize the mobile energy storage vehicle;

[0023] A mode judgment module is configured to judge the use mode of the mobile energy storage vehicle;

[0024] If the use mode of the mobile energy storage vehicle is the charging pile mode, the pile contact is closed by the vehicle-pile switching switch through the main controller, and the first contact of the gun mouth recognition interface is sequentially connected to the double-head charging gun, the charging interface and the electric vehicle;

[0025] If the use mode of the mobile energy storage vehicle is the electric vehicle mode, the vehicle contact is closed by the vehicle-pile switching switch through the main controller, and the second contact of the gun mouth recognition interface is sequentially connected to the double-head charging gun and the direct current charging pile, or the second contact of the gun mouth recognition interface is directly connected to the direct current charging pile.

[0026] Further, if the mobile energy storage vehicle needs to be recharged, the recharging mode of the mobile energy storage vehicle is judged for recharging,

[0027] If the use mode of the mobile energy storage vehicle is the direct current recharging mode, the vehicle contact is closed by the vehicle-pile switching switch through the main controller, and it is judged whether the double-head charging gun and the gun head recognition interface, the charging interface are connected;

[0028] If the connection is not successful, it is indicated that the connection is poor or the charging gun is re-plugged;

[0029] If the connection is successful, the recharging is started according to the charging handshake protocol;

[0030] If the use mode of the mobile energy storage vehicle is the alternating current recharging mode, the recharging is started by turning on the converter through the controller, and the SVG function of the converter is turned on for reactive power compensation, harmonic control and unbalance control.

[0031] Further, the charging pile mode comprises a fixed pile mode and a mobile pile mode;

[0032] When the mobile energy storage vehicle is used as the fixed pile mode, the mobile energy storage vehicle is controlled to be fixed beside the fixed charging pile where the pile quantity needs to be increased;

[0033] The mobile energy storage vehicle moves to a position lacking a fixed charging pile in the mobile pile mode.

[0034] Further, the converter control strategy is a double closed loop control strategy based on coordinate transformation, and specifically is:

[0035] The double closed loop control strategy is composed of an inner current loop and an outer voltage loop, and a difference between a bus capacitor set voltage Voset and a feedback voltage Vdc is subjected to PI regulation and enters a low pass filter, and a voltage difference between a positive voltage Vdc_P and a negative voltage Vdc_N of the bus capacitor is subjected to PI regulation and enters a low pass filter 1.

[0036] The above two components and a zero axis component are subjected to dq transformation to become ABC three-phase active currents, and active and reactive, harmonic or unbalance treatment current commands I_Com are accumulated as current given values.

[0037] Then, a difference between the inductance sampling current IL_abc and the current is subjected to PI regulation, and an LCL filter capacitor current Ic_abc is compensated.

[0038] After the voltage feedforward is introduced, carrier modulation is performed, and the system stability is realized by controlling the power PWM duty cycle size.

[0039] Compared with the prior art, the mobile energy storage vehicle system has the following beneficial effects:

[0040] The mobile energy storage vehicle system combines mobile energy storage and electric charging pile technology, and designs a gun / seat integrated control system to optimize the mobile energy storage vehicle interface. One interface can be used as an external charging interface and a power supplement interface. Through the overall control strategy, the external charging control strategy, the power supplement control strategy and the mobile energy storage vehicle converter control strategy, a unified interface for external charging and power supplement is designed, which is plug and play, flexible configuration, safe and fast. Not only can it be charged by mains power, but also is equipped with a new energy charging port, has the advantages of being mobile, flexible, portable, not limited by region, responding quickly and mature technology. The gun / seat integrated identification control system not only completes the normal function, but also meets the power quality treatment function of the power grid. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings accompanying the specification of the present application form part of the present application and serve to further understand the present application, and the illustrative embodiments of the present application and the description thereof serve to explain the present application and do not constitute an improper limitation of the present application.

[0042] Figure 1 is a mobile energy storage vehicle system model diagram described in the embodiments of the present application;

[0043] Figure 2 is a mobile energy storage vehicle structure block diagram described in the embodiments of the present application is a mobile energy storage vehicle system model diagram described in the embodiments of the present application;

[0044] Figure 3 is a circuit connection diagram of a double-head charging gun according to an embodiment of the present application;

[0045] Figure 4 is a circuit connection diagram of an electric vehicle connected by a double-head charging gun according to an embodiment of the present application;

[0046] Figure 5 is a circuit connection diagram of a charging pile connected by a double-head charging gun according to an embodiment of the present application;

[0047] Figure 6 is a working flow chart of a control system of a mobile energy storage vehicle with a multifunctional interface according to an embodiment of the present application;

[0048] Figure 7 is a control flow chart of external charging according to an embodiment of the present application;

[0049] Figure 8 is a control flow chart of power supplementing according to an embodiment of the present application;

[0050] Figure 9 is a topology structure diagram of a converter according to an embodiment of the present application;

[0051] Figure 10 is a double-loop control strategy diagram according to an embodiment of the present application. DETAILED DESCRIPTION

[0052] The present application will be further described below in conjunction with the accompanying drawings and embodiments.

[0053] It should be noted that the following detailed description is illustrative only and is intended to provide further description of the present application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0054] It should be noted that the terms used herein are only intended to describe specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be further understood that the terms "comprise" and / or "include" as used herein indicate the presence of a feature, step, operation, device, component and / or a combination thereof.

[0055] The embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0056] Embodiment One

[0057] As Figures 1-5As shown, the embodiment provides a multifunctional interface mobile energy storage vehicle, which comprises a vehicle body and a gun head recognition interface, wherein the vehicle body is internally provided with an energy storage circuit assembly, and the gun head recognition interface (interface 1) is connected with the energy storage circuit assembly in the vehicle body.

[0058] The energy storage circuit assembly comprises a main controller and a vehicle pile switching switch Rey1, wherein the main controller is connected with the gun head recognition interface; the main controller is also connected with the vehicle pile switching switch through a first detection point (detection point 1), and the vehicle pile switching switch realizes the switching of the mobile energy storage vehicle to the mobile energy storage charging pile through the connection port of the adjusting switch.

[0059] The vehicle pile switching switch is also connected with the gun head recognition interface.

[0060] It should be noted that the gun head recognition interface here is the interface 1 on the mobile energy storage vehicle in the Figure 2 The charging interface in the following is the interface 2 in the above, which is the charging interface of the electric vehicle when the mobile energy storage vehicle is used as a charging pile. The interface 1 and the interface 2 are both standard charging interfaces, which are prior art. Figure 3

[0061] The energy storage circuit assembly further comprises a vehicle-mounted charger, a current transformer and a vehicle-mounted battery, wherein the vehicle-mounted charger is connected with the main controller through the vehicle-mounted battery; the vehicle-mounted charger is connected with the current transformer through a high-frequency transformer.

[0062] The vehicle-mounted charger, the current transformer and the vehicle-mounted battery are all connected with the main controller and controlled by the main controller.

[0063] The vehicle-mounted charger is connected with the positive and negative lines of the direct current power supply of the gun head recognition interface through a bleeder circuit.

[0064] Specifically, the gun head recognition interface (interface 1) is also connected with a double-head charging gun, and the double-head charging gun is also connected with an electric vehicle through a charging interface (interface 2); the gun head recognition interface (interface 1) is also connected with a direct current charging pile through the double-head charging gun.

[0065] The double-head charging gun comprises a first gun port (gun port 1), a connecting line and a second gun port (gun port 2), wherein the first gun port (gun port 1) is connected with the gun head recognition interface (interface 1); and the second gun port (gun port 2) is connected with the charging interface (interface 2).

[0066] The energy storage circuit assembly further comprises a control power supply, wherein the control power supply is connected with the main controller, and the control power supply is also connected with the gun head recognition interface.

[0067] ​The vehicle pile switching switch includes a vehicle contact and a pile contact, the gun head recognition interface is provided with a first contact point (CC1) and a second contact point (CC2); the pile contact is connected with the first contact point (CC1), and the vehicle contact is connected with the second contact point (CC2).

[0068] Wherein, the essence of the mobile energy storage vehicle is to move the charging pile + mobile energy storage warehouse, and the battery warehouse as the energy storage unit realizes the bidirectional exchange of information and energy with the power grid under the controlled state. The energy storage unit realizes energy supply from the direct current charging pile through the gun / seat integrated interface under the interface recognition and charging instruction. As a multifunctional interface device, it can fully exert the charging gun to realize charging to the electric vehicle. As shown in Figure 1 The mobile energy storage vehicle system model.

[0069] The mobile energy storage vehicle is composed of a vehicle-mounted charger, a converter, a vehicle-mounted battery, a controller and an interface. The converter is directly connected to the power grid, the charger is suitable for vehicle-mounted batteries of different voltage levels, and the interface meets the national standard of GB / T20234.3-2015. Rey1 vehicle pile switching switch is the highlight of the design, which is the key to the reliability identification of gun / seat integrated connection. As shown in Figure 2 The principle block diagram of the mobile energy storage vehicle.

[0070] As shown in Figure 3 The double-head gun schematic diagram, the double-head gun is composed of two gun heads, each gun head meets the national standard, and the gun heads are exactly the same, avoiding misplug and reverse plug.

[0071] As shown in Figure 4 The mobile energy storage vehicle connects the electric vehicle through the double-head gun, and realizes charging to the social electric vehicle. Through the design of the double-head gun, the conventional charging pile charging gun can be upgraded to the double-head gun, and the length of the double-head gun can also be customized arbitrarily to meet different needs, that is, plug and play, convenient to carry and flexible to match.

[0072] As shown in Figure 5 The mobile energy storage vehicle can be directly plugged into the existing charging pile, Rey1 is controlled by the main controller to be connected to the vehicle position, at this time the mobile energy storage vehicle is used as a vehicle like a conventional electric vehicle. When the mobile energy storage vehicle is used as a vehicle, the widely distributed direct current charging pile on the market can supply power to the mobile energy storage vehicle in time. When the mobile energy storage vehicle is used as a pile, Rey1 is controlled to be connected to the pile position, which is convenient for charging operation to the social vehicle.

[0073] Vehicle / pile identification

[0074] Mobile vehicle as pile double-head gun connection confirmation

[0075] As shown in Figure 2As shown, the dual-head guns are symmetrically distributed, and the equivalent identification resistors R11-R21, R12-R22, R13-R23, and R14-R24 all have a resistance of R. When the mobile energy storage vehicle is used as a charging station, the main controller is connected to the charging station location via Rey1, and connected to connector 1 of interface 1, the dual-head guns, and connector 2 of interface 2 via contact point CC1. The voltage level at detection point T1 determines whether the vehicle connection is reliable. The connection of interface 1 / interface 2 of the dual-head gun presents three states: not plugged in, poorly plugged in, and plugged in well, represented by 0, 1, and 2 respectively, as shown in Table 1. When the energy storage vehicle is used as a charging station, the connection status is judged, and nine cases are displayed and transmitted to the control center. At the interface 2 connection point, CC2, through detection point T2, also serves as a judgment on whether interface 2 is properly connected. When the voltage at detection point 1 is U1 (1 / 5), both interface 1 and interface 2 are properly connected.

[0076] Table 1 Interface Status

[0077]

[0078] When the mobile vehicle is used as a vehicle, the connection is switched.

[0079] like Figure 5 The mobile energy storage vehicle shown is charged via a charging station interface when used as a vehicle. In this case, the charging gun represents a widely deployed charging station, and the mobile energy storage vehicle resembles an electric vehicle. When the mobile energy storage vehicle is used as a vehicle, the main controller Rey1 is connected to the vehicle's location. It uses the status of CC1 and CC2 on the vehicle interface 1 to determine if the charging gun is properly connected to the charging station, thus enabling the function of charging via a DC charging station.

[0080] The advantages of this design are: the charging cable and the mobile energy storage vehicle are separate, allowing for plug-and-play convenience and flexibility. The charging cable nozzle connection is a standard method, with no positive or negative distinction, and both ends are identical, eliminating the possibility of incorrect or reversed connection.

[0081] Control strategy

[0082] Overall control strategy

[0083] The overall control strategy process for mobile energy storage vehicles is as follows: Figure 6As shown, there are mainly five working modes, which are fixed pile mode, mobile pile mode, emergency rescue mode, AC power supply mode and DC power supply mode. The mobile energy storage vehicle is mainly used as a fixed pile in holiday travel peak, traffic busy road and the like, and is distributed in advance in the high-speed charging station to increase the pile quantity and solve the electric vehicle charging waiting problem. As a mobile pile, it is mainly used to meet the flexible application demand due to the high mobility. The emergency rescue mode is used in the emergency demand occasions such as hospital, road rescue, emergency disaster relief and road construction. After the mobile vehicle returns to the base, it needs to be powered in time, and the design can be powered by AC or DC charging pile interface, i.e. plug and play, convenient and flexible.

[0084] External charging control strategy

[0085] When the mobile energy storage vehicle is used as a charging pile, it is externally charged in combination with BMS control, SOC state of charge and whether the AC side is connected to the power grid to determine whether to use the AC power grid or the battery as the power source for external charging.

[0086] As shown in Figure 7 , it is an external charging flowchart. When the AC power grid and the SOC state of charge both meet the external charging demand, the AC power grid supplies power in priority. Rey1 is closed to select the relay to the "pile" position, the gun / seat connection is confirmed to be good, the GB / T27930-2015 charging pile protocol requirement is met, and the charging function is started. When the power grid is connected to perform the charging pile mode, the SVG function can be started at the same time to meet the reactive power compensation, harmonic control and unbalance control functions around the mobile energy storage vehicle.

[0087] Power supply control strategy

[0088] When the rescue task, road emergency and the like are completed, the mobile energy storage vehicle needs to be powered in time. The battery power supply strategy is to give priority to AC power supply, and when there is no AC interface or it is not convenient to connect to the power grid, the DC charging gun of the charging pile can be inserted into the charge-discharge multifunctional interface. The interface can be used as an external charging interface and a power supply interface, and is flexibly configured, i.e. plug and play, to reduce the vehicle process and improve the efficiency of the vehicle personnel.

[0089] As shown in Figure 8 , it is a power supply control flowchart. When the DC power supply is connected, the reliability of the connection is automatically confirmed, and the mobile energy storage vehicle is equivalent to a social electric vehicle to meet the GB / T27930-2015 charging protocol. When the AC power grid is powered, the SVG function can be started at the same time to meet the reactive power compensation, harmonic control and unbalance control functions around the conventional charging pile.

[0090] Mobile energy storage vehicle converter control strategy

[0091] The mobile energy storage vehicle is configured with a converter, which is the core of connecting the power grid, as shown in Figure 9 The control task of the converter is mainly to perform constant voltage or constant current charging and discharging according to the characteristics of the battery pack or the state of the DC charger. The design is mainly based on a double closed-loop control strategy based on coordinate transformation.

[0092] The double closed-loop control strategy is composed of an inner current loop and an outer voltage loop, as shown in Figure 10 The difference between the bus capacitor set voltage Voset and the feedback voltage Vdc is PI regulated into a low-pass filter, and the voltage difference between the positive voltage Vdc_P and the negative voltage Vdc_N of the bus capacitor is PI regulated into a low-pass filter 1. The above two components and the zero-axis component are dq-transformed into ABC three-phase active current. The active and reactive, harmonic or imbalance treatment current commands I_Com are accumulated as current given. Then, the difference between the inductance sampling current IL_abc and the PI regulated current is compensated by the LCL filter capacitor current Ic_abc. After introducing the voltage feedforward, the carrier modulation is performed to control the power PWM duty cycle to realize system stability.

[0093] The system realizes decoupling control between each phase, realizes capacitor voltage stability, active and reactive current control, harmonic treatment and imbalance treatment functions. It can participate in power grid frequency control, auxiliary regulation of low-voltage power system frequency regulation, flexible improvement of power grid energy distribution, suppression of new energy and load fluctuation, effective improvement of new energy consumption capacity of power system, suppression of power grid fluctuation and increase of power grid stability.

[0094] Conclusion

[0095] With the growth of power demand for major events, the rapid development of battery energy storage technology and electric vehicle charging pile technology, the traditional mobile energy storage vehicle needs to be equipped with charging and discharging interfaces, which occupies space and cannot meet the market demand of flexible configuration and plug-and-play. In this paper, a gun / seat integrated control system is designed based on mobile energy storage and electric charging pile technology to optimize the interface of mobile energy storage vehicle. One interface can be used as an external charging interface and a supplementary power interface. Through the overall control strategy, external charging control strategy, supplementary power control strategy and mobile energy storage vehicle converter control strategy, a unified interface for external charging and supplementary power is designed, which is plug-and-play, flexible configuration, safe and fast. Not only can it be charged through the mains, but also it is equipped with a new energy charging port, which has the advantages of mobility, portability, no geographical restrictions, rapid response and mature technology. The designed gun / seat integrated identification control system not only completes the normal functions, but also meets the power quality management function of the power grid.

[0096] Example Two

[0097] The embodiment provides a control system of a multifunctional interface mobile energy storage vehicle as described in embodiment one, and the control system comprises:

[0098] An initialization module configured to initialize the mobile energy storage vehicle;

[0099] A mode judgment module configured to judge the use mode of the mobile energy storage vehicle;

[0100] If the use mode of the mobile energy storage vehicle is the charging pile mode, the main controller is used to close the pile contact point through the vehicle-pile switching switch, and the first contact point of the gun mouth recognition interface is used to sequentially connect the double-head charging gun, the charging interface and the electric vehicle;

[0101] If the use mode of the mobile energy storage vehicle is the electric vehicle mode, the main controller is used to close the vehicle contact point through the vehicle-pile switching switch, and the second contact point of the gun mouth recognition interface is used to sequentially connect the double-head charging gun and the direct current charging pile, or directly connect the direct current charging pile through the second contact point of the gun mouth recognition interface.

[0102] Further, if the mobile energy storage vehicle needs to be powered, the power mode of the mobile energy storage vehicle is judged to power,

[0103] If the use mode of the mobile energy storage vehicle is the direct current power mode, the main controller is used to close the vehicle contact point through the vehicle-pile switching switch, and it is judged whether the double-head charging gun and the gun head recognition interface, the charging interface are connected;

[0104] If the connection is not successful, it is indicated that the connection is poor or the charging gun is re-plugged;

[0105] If the connection is successful, the power is started according to the charging handshake protocol;

[0106] If the use mode of the mobile energy storage vehicle is the alternating current power mode, the controller is used to start the power of the converter, and the SVG function of the converter is used to start the reactive power compensation, harmonic control and unbalance control.

[0107] Further, the charging pile mode comprises a fixed pile mode and a mobile pile mode;

[0108] When the mobile energy storage vehicle is used as the fixed pile mode, the mobile energy storage vehicle is controlled to be fixed beside the fixed charging pile which needs to increase the pile position;

[0109] When the mobile energy storage vehicle is used as the mobile pile mode, the mobile energy storage vehicle is controlled to move in the position where the fixed charging pile is lacked.

[0110] Further, the converter control strategy is a double closed loop control strategy based on coordinate transformation, and specifically comprises:

[0111] The double closed-loop control strategy is composed of an inner current loop and an outer voltage loop, a difference between a bus capacitor set voltage Voset and a feedback voltage Vdc is subjected to PI regulation and enters a low-pass filter, and a voltage difference between a positive voltage Vdc_P and a negative voltage Vdc_N of the bus capacitor is subjected to PI regulation and enters a low-pass filter 1;

[0112] The above two components and the zero-axis component are subjected to dq transformation into ABC three-phase active currents; active and reactive, harmonic or unbalance treatment current commands I_Com are accumulated as current given values;

[0113] Then, a difference between the inductance sampling current IL_abc and the above is subjected to PI regulation, and then LCL filter capacitor current Ic_abc is compensated;

[0114] After the voltage feedforward is introduced, carrier modulation is performed, and the system stability is realized by controlling the power PWM duty cycle size.

[0115] With the rapid development of mobile energy storage technology and electric vehicle technology, higher requirements are put forward for the flexibility and convenience of mobile energy storage vehicle interfaces. A gun / pole integrated control system for mobile energy storage vehicles is proposed in this paper. The gun / pole integrated system model is established, the principle block diagram is drawn, the double-head gun plug-in state recognition principle and discrimination method are analyzed, and the vehicle / pole switching function and anti-reverse connection function are designed in accordance with the national standard. The main controller coordinates the charging process of the charging pile and the power compensation process when the mobile energy storage vehicle is used. As a converter connected to the power grid, the mobile energy storage vehicle and the power grid are the hub. Through real-time sampling of power grid information and double-loop control strategy, the mobile energy storage vehicle has the functions of reactive power compensation, harmonic control, and unbalance control, etc. while completing the normal functions.

[0116] Although the specific embodiments of the present application are described above in combination with the drawings, it is not a limitation on the scope of protection of the present application. Those skilled in the art should understand that various modifications or variations made by those skilled in the art without creative labor on the basis of the technical solutions of the present application are still within the scope of protection of the present application.

Claims

1. A control system for a mobile energy storage vehicle with a multi-functional interface, characterized in that, include: The initialization module is configured to initialize the mobile energy storage vehicle, which includes the vehicle body and the gun head identification interface. The vehicle body is equipped with an energy storage circuit assembly, and the gun head identification interface is connected to the energy storage circuit assembly inside the vehicle body; The gun head identification interface is also connected to a dual-head charging gun, which is also connected to an electric vehicle via a charging interface; the gun head identification interface is also connected to a DC charging pile via the dual-head charging gun. The dual-head charging gun includes a first nozzle, a connecting wire, and a second nozzle. The first nozzle is connected to the gun head identification interface, and the second nozzle is connected to the charging interface. The energy storage circuit assembly includes a main controller and a vehicle-to-charging-pile switching switch. The main controller is connected to the gun head identification interface. The main controller is also connected to the vehicle-to-charging-pile switching switch through a first detection point. The vehicle-to-charging-pile switching switch realizes the switching from mobile energy storage vehicle to mobile energy storage charging pile by adjusting the connection port of the switch. The vehicle-pile switching switch is also connected to the gun head identification interface; The vehicle-pile switching switch includes a vehicle contact and a pile contact. The gun head identification interface is provided with a first contact point and a second contact point. The pile contact is connected to the first contact point, and the vehicle contact is connected to the second contact point. The mode determination module is configured to determine the usage mode of the mobile energy storage vehicle. If the mobile energy storage vehicle is used in charging pile mode, the main controller closes the charging pile contact through the vehicle-to-charging pile switching switch, and sequentially connects the dual-head charging gun, charging interface and electric vehicle through the first contact point of the gun identification interface. If the mobile energy storage vehicle is used in electric vehicle mode, the vehicle contact is closed by the vehicle-to-charging-pile switching switch through the main controller, and the dual-head charging gun and DC charging pile are connected in sequence through the second contact point of the gun identification interface, or the DC charging pile is directly connected through the second contact point of the gun identification interface. If the mobile energy storage vehicle needs recharging, determine its recharging mode and proceed accordingly. If the mobile energy storage vehicle is used in DC charging mode, the main controller will close the vehicle contacts using the vehicle-to-charging-pile switching switch and determine whether the dual-head charging gun is connected to the gun head identification interface and the charging interface. If the connection fails, it indicates a poor connection or you should unplug and replug the charging gun. If the connection is successful, charging will begin according to the charging handshake protocol; If the mobile energy storage vehicle is used in AC power supply mode, the converter is activated through the controller to supply power, and the converter activates the SVG function to perform reactive power compensation, harmonic control and imbalance control. The converter control strategy is a dual closed-loop control strategy based on coordinate transformation, specifically: The dual closed-loop control strategy consists of an inner current loop and an outer voltage loop. The difference between the bus capacitor set voltage Voset and the feedback voltage Vdc is regulated by a PI controller and enters a low-pass filter. The voltage difference between the positive voltage Vdc_P and the negative voltage Vdc_N of the bus capacitor is regulated by a PI controller and enters a low-pass filter. The active current is converted into three-phase ABC current by dq; the accumulated active and reactive current, harmonic or unbalanced current control command I_Com is used as the current reference. Then, the difference is calculated with the inductor sampling current IL_abc, and after PI adjustment, the LCL filter capacitor current Ic_abc is compensated. After introducing voltage feedforward, the system stabilizes by controlling the duty cycle of the power PWM through carrier modulation.

2. The control system for a mobile energy storage vehicle with a multi-functional interface as described in claim 1, characterized in that, The charging pile modes include fixed pile mode and mobile pile mode; When the mobile energy storage vehicle is used as a fixed pile, the mobile energy storage vehicle is controlled to be fixed next to the fixed charging pile where the number of pile positions needs to be increased. When the mobile energy storage vehicle is used as a mobile charging station, it is controlled to move to locations where there are no fixed charging stations.

3. The control system for a mobile energy storage vehicle with a multi-functional interface as described in claim 1, characterized in that, The energy storage circuit assembly also includes an on-board charger, an inverter, and an on-board battery. The on-board charger is connected to the main controller via the on-board battery. The on-board charger is connected to the inverter via a high-frequency transformer. The on-board charger, inverter, and on-board battery are all connected to and controlled by the main controller.

4. The control system for a mobile energy storage vehicle with a multi-functional interface as described in claim 3, characterized in that, The on-board charger is connected to the positive and negative DC power lines of the gun head identification interface via a discharge circuit.

5. The control system for a mobile energy storage vehicle with a multi-functional interface as described in claim 1, characterized in that, The energy storage circuit assembly also includes a control power supply, which is connected to the main controller and also to the gun head identification interface.

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