Flexible charging pile charging system, device and method based on situation awareness and interaction control

Abstract

The invention discloses a flexible charging pile charging system, device and method based on situation awareness and interaction control, and relates to the technical field of flexible charging piles, the flexible charging pile charging system comprises a processing module, a sensing module, a control module, a communication module, a power supply module, a monitoring protection module and a remote module; the processing module is used for carrying out edge calculation processing operation and self-adaptive power calculation when a plurality of electric vehicles are charged at the same time; the sensing module monitors each parameter of the charging system; the control module performs power control operation on the charging system; the communication module performs data exchange by using a line carrier and an interface protocol; the power supply module provides an alternating current power supply; the monitoring protection module monitors the charging system in real time; the remote module is connected with the Internet of Things platform through a wireless Internet of Things communication interface and a protocol; through mutual cooperation of all the modules, the system can operate on an existing single-phase or three-phase power line, and the purpose of charging multiple electric vehicles at the same time is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible charging pile AC charging, and in particular to a flexible charging pile charging system, equipment and method based on situation awareness and interactive control, which are used for flexible operation of charging piles. Background Art

[0002] As the world strives to achieve the goals of carbon peak and carbon neutrality, electric vehicles (EVs) have gradually become the mainstream means of transportation. Faced with the growing demand for EV charging, how to provide convenient charging facilities in parking spaces in homes, residential areas, office areas, enterprises, public places, etc. without increasing or minimizing the increase in power supply capacity and without expanding or minimizing the expansion of charging lines under the existing power grid architecture has become a key challenge in promoting the popularization of EVs.

[0003] In order to solve this problem, it is particularly important to develop an intelligent and flexible power supply and charging system. This system can provide charging capacity for each parking space without increasing the burden on the power grid. It is expected to become the main development direction in the field of power supply and electric vehicle charging, and is a hot area of ​​global investment now and in the future.

[0004] Existing AC charging piles, whether fixed or portable, usually require a power supply capacity that matches the charging power of the charging pile and the electric vehicle. When multiple electric vehicles are charged at the same time or share the same power supply line with household power loads, insufficient power supply capacity may result, causing overload and tripping. If charging piles are installed for each parking space or access sockets for portable charging piles are provided, the power grid will require a huge power supply capacity, which is not only a great burden on the power grid, but also requires huge investment and is inefficient.

[0005] In parking spaces in homes, offices, businesses, industries, apartments, etc., it is often necessary to meet the charging needs of high-power household appliances such as dryers, air conditioners, and multiple electric vehicles at the same time under limited power supply capacity. This situation is common in homes with parking spaces and shared or dedicated parking spaces, and they face the same challenges. Therefore, developing a system that can intelligently and flexibly allocate power resources under existing power conditions to meet the charging needs of electric vehicles and household appliances is crucial for the widespread adoption of electric vehicles.

[0006] In the prior art, the Chinese authorized patent announcement number: CN 108075536 B discloses that the present invention discloses a flexible charging control method for charging piles and a charging pile system, specifically including a flexible charging control method for charging piles and a charging pile system with flexible charging control function. The method and system of the present invention monitor the charging power of the charging piles in real time through self-organizing network communication between charging piles, automatically control the charging power of the pile body, make the sum of the power values ​​of the charging piles in the area less than the rated power of the transformer, realize orderly charging, flexible control, and reduce the impact of the charging behavior of electric vehicles on the distribution network. The present invention takes the charging station or the charging pile under the dedicated transformer as a unit. Under the condition of meeting the regional charging load demand, the charging station and the regional charging pile under the dedicated transformer can dispatch the load, automatically balance and adjust the maximum power of the charging pile in the area, ensure that the dedicated transformer in the charging station will not be overloaded, and realize the orderly charging of electric vehicles and the safe and economical operation of the distribution network. Summary of the invention

[0007] The technical problem to be solved by the present invention is to address the deficiencies in the prior art and disclose a flexible charging pile charging system, equipment and method based on situational awareness and interactive control, thereby solving the problem of electric vehicle charging efficiency.

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: including a processing module, a sensing module, a control module, a communication module, a power module, a monitoring and protection module, and a remote module;

[0009] The processing module is used for the charging system to perform edge computing processing operations and to perform adaptive computing for charging multiple electric vehicles simultaneously;

[0010] The sensing module monitors the current, voltage, power, electricity, and temperature parameters of the charging system in real time;

[0011] The control module performs power control operation on the charging system by receiving the control signal from the processing module;

[0012] The communication module exchanges data with the processing module and the monitoring and protection module by using the embedded power line carrier and interface protocol;

[0013] The monitoring and protection module monitors the temperature, current, grounding and short circuit of the charging system in real time;

[0014] The remote module is connected to the Internet of Things platform through a wireless Internet of Things communication interface and protocol.

[0015] Further:

[0016] The sensing module includes a sensing element;

[0017] The sensing elements include a position sensing element, a socket waterproof cover position sensing element, a temperature control sensing element, a relay contact welding sensing element, a fuse blowing sensing element, a B-type residual current sensing element and a grounding detection sensing element;

[0018] The position sensing element is respectively placed at the power input plug of the flexible charging socket and the charging pile, and the power output socket is plugged into the position sensing element through the plug. When any phase input current at the power plug exceeds the set value and hot plugging is performed, the load current will be quickly reduced or turned off;

[0019] The socket waterproof cover position sensing element is placed at the output end of the flexible charging socket. When any phase input current of the plug exceeds the set value and the waterproof cover is opened, the socket waterproof cover position sensing element will quickly shut off the load current through the socket waterproof cover position sensing element.

[0020] The temperature sensing element is placed at the power input end of the flexible charging socket and the charging pile. When the temperature exceeds the set value, the load current is reduced or shut down through the temperature sensing element;

[0021] The relay contact welding sensing element can alarm and lock the power supply operation when any contact of the relay inside the device of the flexible charging pile has a welding failure;

[0022] When the fuse inside the device of the flexible charging pile is blown, the fuse blown sensing element performs a blown alarm prompt and locks the power supply operation;

[0023] When the leakage current inside the device of the flexible charging pile exceeds the set limit, the B-type residual current sensing element issues a leakage alarm and cuts off the power supply output;

[0024] When the grounding detection sensing element detects that the grounding wire is not reliably grounded inside the device of the flexible charging pile, it issues an alarm prompt for unreliable grounding of the grounding wire and cuts off the power supply output.

[0025] Further:

[0026] The control module includes a fuse, a magnetic latching relay, a charging relay and a high current controller;

[0027] The charging relay uses a control mode in which a 12V power supply is pulled in for 200ms to switch between a 5V or 3.3V power supply, thereby reducing power consumption in the charging system;

[0028] The high current controller uses a thyristor in a magnetic latching relay hard contact mode to control the high current in the charging system.

[0029] Further:

[0030] The monitoring module includes position monitoring, temperature monitoring, current monitoring, grounding monitoring and short circuit monitoring;

[0031] The position monitoring uses the position sensing element to monitor the input conditions at the power input plug and the power output socket of the flexible charging socket and the charging pile, and uses the socket waterproof cover position sensing element to monitor the input condition at the power plug;

[0032] The temperature monitoring uses the temperature sensing element to monitor whether the temperature of the power input terminal exceeds a temperature setting value, and the temperature setting value is 45° C.;

[0033] The grounding detection monitors whether the grounding wire inside the device of the flexible charging pile is reliably grounded;

[0034] Finally, the monitoring report inside the device of the flexible charging pile is output to the processing module.

[0035] Further:

[0036] The remote module uses 4G, 5G, WiFi, and NFC wireless IoT communication interfaces and protocols to achieve connection with the IoT platform;

[0037] The charging system also includes a user end, which is connected to a mobile phone APP via Bluetooth. The mobile phone APP can collect and display the status data of the flexible charging socket and the charging pile, set the operating mode, and receive alarm prompts.

[0038] Further:

[0039] The flexible charging equipment includes a power input single-phase / three-phase plug, a flexible charging socket, a portable AC charging pile and a high-power power load;

[0040] The high-power electrical load and the portable AC charging pile are plugged into the flexible charging socket;

[0041] The flexible charging socket is a composite switch composed of a thyristor and a magnetic latching relay.

[0042] Further:

[0043] The flexible charging socket includes an output single-phase / three-phase socket, a circuit breaker, a situation mode button, a situation mode display and a situation indication;

[0044] The maximum output current of the output single-phase / three-phase socket is 60A, and the number of the output single-phase / three-phase sockets is not less than 3.

[0045] Further:

[0046] The flexible charging socket comprises a main flexible charging socket and a slave flexible charging socket, and the flexible charging socket and the AC charging pile are provided with the power input single-phase / three-phase plug via a cable.

[0047] Flexible charging control is achieved by exchanging data between the flexible charging socket and the flexible charging pile, and between the master flexible charging socket and the slave flexible charging socket through embedded power line carrier communication.

[0048] Further:

[0049] The flexible charging socket adopts a multi-socket link expansion structure;

[0050] The multi-socket link expansion structure adopts a serial link method to link multiple flexible charging sockets to form a multi-level charging pile flexible AC charging system, which can charge more than 5 electric vehicles at the same time; the first flexible socket of this link architecture serves as the main socket, and the subsequent flexible sockets are connected as slave sockets and are controlled by the main socket.

[0051] Further:

[0052] The flexible portable charging pile includes a single-phase / three-phase charging gun;

[0053] The rated current output by the single-phase / three-phase charging gun is 50A;

[0054] The current capacity range of the flexible portable charging pile is 8A-63A.

[0055] The flexible charging equipment includes a flexible charging socket, a portable AC charging pile and a high-power power load;

[0056] The high-power electrical load and the portable AC charging pile are plugged into the flexible charging socket;

[0057] The flexible charging socket is a composite switch composed of a thyristor and a magnetic latching relay.

[0058] Further:

[0059] The system performs the following calculation method:

[0060] The flexible charging system can automatically control the power of the power consumption and charging loads when the sum of the rated power of multiple power consumption and charging loads is greater than the rated capacity power of the power supply, so that the actual power consumption and charging power are always less than or equal to the rated capacity power of the power supply, and complete the load power supply and charging of multiple electric vehicles. The control calculation formula is as follows:

[0061] Electric load power control calculation: P Ln =K p ×S p ×K t ×Pr Ln Formula (1) Charging load power control calculation: P Cn =K p ×S p ×K t ×Pr Cn Formula (2) Power supply control calculation: P S =∑P Cn +∑P Ln Formula (3) Power supply power limit control calculation: Pr s ≧P S Formula (4)

[0062] Among them, K p is the socket output power factor, S p is the time window coefficient; K t is the temperature coefficient; n is the number of the power load or charging load, Pr s Ps is the rated capacity power of the power supply; c Pr is the actual power supply; L1 , Pr L2 ,,,Pr Ln P is the rated power of the electrical load; L1 , P L2 ,,,P Ln Pr is the actual power of the electrical load; c1 , Pr c2 ,,,Pr cn is the rated power of the charging load; P c1 , P c2 ,,,P cn is the actual power of the charging load, P s It is the actual capacity power of power supply;

[0063] Monitoring and calculation are performed through the situation awareness elements of the flexible charging socket and the flexible portable AC charging pile, and situation data are exchanged and calculated between the charging piles by using the electrically connected power line carrier communication, and power control of the charging system power load and charging load is achieved according to the formulas (1) to (4);

[0064] Further:

[0065] If the output circuit of the flexible charging socket and the charging pile fails, the AC small signal injection detection method is used to connect the output circuit to the load to determine whether a short circuit occurs or the impedance parameter is lower than the set value before starting the power supply. When a short circuit is detected or the impedance parameter is lower than the set value, the power supply operation will be locked to avoid causing a safety accident. The detection steps and calculation method are as follows:

[0066] Step 1: Output circuit load characteristic detection:

[0067] Set the three-phase power supply switch K of the charging socket a , K b ,、K c and the three-phase detection injection switch Ki of the charging device a 、Ki b ,、Ki c disconnect

[0068] Normal voltage measurement V a \V b \V c =Kvt×(Vr a \Vr b \Vr c )Formula (5)

[0069] Step 2: Measure the corresponding phase voltage, any output circuit or load phase line and V n A short circuit occurs, and the corresponding phase voltage measurement value is less than the short circuit limit Vs l ,

[0070] Voltage measurement value: V a \V b \V c ≤Vs l ,Formula (6)

[0071] Step 3: Determine whether the voltage vector value detected by the corresponding phase voltage is equal to the vector value of the third phase.

[0072] If phases A and B are short-circuited, ∠V a +∠V b =∠V c Formula (7)

[0073] If phases A and C are short-circuited, ∠V a +∠V c =∠V b Formula (8) If phases B and C are short-circuited, ∠V b +∠V c =∠V a Formula (9)

[0074] Step 4: Check the output circuit load characteristics

[0075] Set the three-phase power supply switch K of the charging socket a , K b ,、K c Disconnect, three-phase detection injection switch Ki a 、Ki b 、Ki c Close, three-phase measurement current limiting resistor R a , R b ,、R c The internal resistance Rvt of the three-phase current transformer VT a , Rvt b , Rvt c The ratio is >1000, the output circuit load characteristic measurement calculation formula is:

[0076] Injection detection current:

[0077] I a ,I b ,、I c = (Vr a 、Vr b 、Vr c ) / (R a , R b , R c ) Formula (10)

[0078] Load impedance:

[0079] I a ×AL×Rvt a =V a / Kvt×(AL+Rvt a ) Formula (11)

[0080] AL×(I a ×Rvt a -V a / Kvt)=V a / Kvt×Rvt a Formula (12)

[0081] AL=Va / Kvt×Rvt a / (I a ×Rvt a -V a / Kvt) formula (13)

[0082] The BL and CL calculation results can also be obtained using the above method.

[0083] Among them, Vr a 、Vr b 、Vr c is the three-phase rated input voltage; V a\V b \V c I is the three-phase measured voltage; a ,I b ,I c Inject measurement current into three phases; K a , K b ,、K c It is a three-phase power supply switch; Ki a 、Ki b 、Ki c Injection switch for three-phase detection; R a , R b , R c For three-phase measurement of current limiting resistance; Rvt a , Rvt b , Rvt c is the internal resistance of the three-phase current transformer VT; VT a VT b ,VT c It is a three-phase AC voltage transformer; V n is the neutral point of three-phase AC; Kvt is the transformation ratio coefficient of the measuring voltage transformer; AL, BL, and CL are the three-phase AC load impedances; Vs l It is the measurement limit of phase-to-neutral short-circuit voltage.

[0084] Compared with the prior art, the present invention has the following beneficial effects:

[0085] 1. The situation awareness component integration of the present invention: Integrate multiple sensing components to monitor various parameters of the charging system in real time, such as current, voltage, power, electricity, temperature, etc.

[0086] 2. Edge computing capabilities: Use edge computing nodes to process and store collected data on-site, and upload the data to cloud servers via IoT communications.

[0087] 3. Adaptive control algorithm: Through the adaptive algorithm, the power of electricity consumption and charging load is dynamically adjusted according to real-time monitoring data to ensure that the rated capacity of the power supply is not exceeded. A basic flexible AC charging system for electric vehicles with charging piles consists of a flexible charging socket, a high-power load, and two flexible portable AC charging piles with single-phase or three-phase inputs; the load and the charging pile are plugged into the flexible charging socket (or all of them can be plugged into the charging pile), and the socket and the charging pile form a set of systems that can sense the socket power supply capacity, the charger charging or the load power consumption status through the power line carrier communication connection method, and control the power, sequence, and time period of power consumption and charging through an interactive adaptive algorithm to ensure that the load power consumption and multiple vehicles are charged simultaneously within the limited range of the socket power supply capacity; the flexible charging system can automatically control the power of the power consumption and charging load when the sum of the rated power of multiple power consumption and charging loads is greater than the rated capacity power of the power supply, so that the actual power consumption and charging power is always less than or equal to the rated capacity power of the power supply, and complete the load power supply and charging of multiple electric vehicles, which are monitored and calculated by the situation perception elements of the flexible charging socket and the flexible portable AC charging pile, and the situation data is interacted and calculated between the charging piles through the electrically connected power line carrier communication to achieve power control of the power consumption load and the charging load.

[0088] 4. The flexible intelligent charging socket design of the present invention: Develop a flexible intelligent charging socket including a single-phase / three-phase 60A input plug, three (or more) single-phase / three-phase 60A output sockets and a flexible portable charging pile with a single / three-phase 50A charging gun output. It can charge a dryer, an air conditioner and more than two electric vehicles at the same time in a home with its own parking space on an existing single-phase or three-phase line, within the range of 8-63A current capacity according to the line capacity, and can charge multiple electric vehicles at the same time in a public or private parking lot.

[0089] 5. Flexible portable charging pile: The charging pile can provide single-phase or three-phase AC charging, with a maximum output current of 50A and supports different voltage and power outputs.

[0090] 6. Multi-socket link expansion structure: allows multiple flexible charging sockets to be connected in series to form a multi-level charging system and expand charging capacity. According to the above calculation method, there can be more than one flexible charging socket, and multiple flexible charging sockets are linked in series to form a multi-level flexible AC charging system for electric vehicles, which can charge more than 5 electric vehicles at the same time; the first flexible socket of this link architecture serves as the main socket, and the subsequent flexible sockets are connected as slave sockets to accept the control of the main socket.

[0091] 7. Power line carrier communication technology: Power line carrier communication technology is used to realize data exchange and control between the socket and the charging pile. Flexible charging control is realized by data exchange between the flexible charging socket and the flexible charging pile, and between the master flexible charging socket and the slave flexible charging socket through embedded power line carrier communication.

[0092] 8. Comprehensive safety monitoring and protection: The design includes multiple safety protection measures such as temperature monitoring, current monitoring, grounding monitoring, short circuit monitoring, etc.

[0093] 9. High current control technology: using a composite switch consisting of a thyristor and a magnetic latching relay. BRIEF DESCRIPTION OF THE DRAWINGS

[0094] Figure 1 Schematic diagram of flexible charging system;

[0095] Figure 2 Schematic diagram of charging equipment;

[0096] Figure 3 Schematic diagram of flexible charging system;

[0097] Figure 4 Schematic diagram of the flexible charging system with link extension;

[0098] Figure 5 Workflow diagram of the flexible charging system.

[0099] Reference numerals:

[0100] 1-Power input single-phase / three-phase plug; 2-Output single-phase / three-phase socket; 3-Circuit breaker; 4-Status mode button; 5-Status mode display; 6-Status indication; 7-Charging load; 8-Single-phase / three-phase charging gun; 9-Power load. DETAILED DESCRIPTION

[0101] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0102] like Figure 1 As shown, it shows a schematic diagram of the charging system of the present invention, including a processing module, a sensing module, a control module, a communication module, a power module, a monitoring and protection module, and a remote module;

[0103] The processing module is used for the charging system to perform edge computing processing operations and to perform adaptive computing for charging multiple electric vehicles simultaneously;

[0104] The sensing module monitors the current, voltage, power, electricity, and temperature parameters of the charging system in real time;

[0105] The control module performs power control operation on the charging system by receiving the control signal from the processing module;

[0106] The communication module exchanges data with the processing module and the monitoring and protection module by using the embedded power line carrier and interface protocol;

[0107] The monitoring and protection module monitors the temperature, current, grounding and short circuit of the charging system in real time;

[0108] The remote module is connected to the Internet of Things platform through a wireless Internet of Things communication interface and protocol.

[0109] Preferred are:

[0110] The sensing module includes sensing elements; the sensing elements include position sensing elements, socket waterproof cover position sensing elements, temperature control sensing elements, relay contact welding sensing elements, fuse blowing sensing elements, type B residual current sensing elements and grounding detection sensing elements;

[0111] The position sensing element is respectively placed at the power input plug of the flexible charging socket and the charging pile, and the power output socket is plugged into the position sensing element through the plug. When any phase input current at the power plug exceeds the set value and hot plugging is performed, the load current will be quickly reduced or turned off;

[0112] The socket waterproof cover position sensing element is placed at the output end of the flexible charging socket. When any phase input current of the plug exceeds the set value and the waterproof cover is opened, the socket waterproof cover position sensing element will quickly shut off the load current through the socket waterproof cover position sensing element.

[0113] The temperature sensing element is placed at the power input end of the flexible charging socket and the charging pile. When the temperature exceeds the set value, the load current is reduced or shut down through the temperature sensing element;

[0114] The relay contact welding sensing element can alarm and lock the power supply operation when any contact of the relay inside the device of the flexible charging pile has a welding failure;

[0115] When the fuse inside the device of the flexible charging pile is blown, the fuse blown sensing element performs a blown alarm prompt and locks the power supply operation;

[0116] When the leakage current inside the device of the flexible charging pile exceeds the set limit, the B-type residual current sensing element issues a leakage alarm and cuts off the power supply output;

[0117] When the grounding detection sensing element detects that the grounding wire is not reliably grounded inside the device of the flexible charging pile, it issues an alarm prompt for unreliable grounding of the grounding wire and cuts off the power supply output.

[0118] The control module includes a fuse, a magnetic latching relay, a charging relay and a high current controller;

[0119] The charging relay uses a control mode in which a 12V power supply is pulled in for 200ms to switch between a 5V or 3.3V power supply, thereby reducing power consumption in the charging system;

[0120] The high current controller uses a thyristor in a magnetic latching relay hard contact mode to control the high current in the charging system.

[0121] The monitoring module includes position monitoring, temperature monitoring, current monitoring, grounding monitoring and short circuit monitoring;

[0122] The position monitoring uses the position sensing element to monitor the input conditions at the power input plug and the power output socket of the flexible charging socket and the charging pile, and uses the socket waterproof cover position sensing element to monitor the input condition at the power plug;

[0123] The temperature monitoring uses the temperature sensing element to monitor whether the temperature of the power input terminal exceeds a temperature setting value, and the temperature setting value is 45° C.;

[0124] The grounding detection monitors whether the grounding wire inside the device of the flexible charging pile is reliably grounded;

[0125] Finally, the monitoring report inside the device of the flexible charging pile is output to the processing module.

[0126] Preferred are:

[0127] The remote module uses 4G, 5G, WiFi, and NFC wireless IoT communication interfaces and protocols to achieve connection with the IoT platform;

[0128] The charging system also includes a user end, which is connected to a mobile phone APP via Bluetooth. The mobile phone APP can collect and display the status data of the flexible charging socket and the charging pile, set the operating mode, and receive alarm prompts.

[0129] like Figure 2 and Figure 3As shown, it shows a schematic diagram of the charging socket and the flexible charging pile of the present invention, wherein the flexible charging device includes a flexible charging socket, a portable AC charging pile and a high-power power load;

[0130] The high-power electrical load and the portable AC charging pile are plugged into the flexible charging socket;

[0131] The flexible charging socket is a composite switch composed of a thyristor and a magnetic latching relay;

[0132] Preferably: a composite switch consisting of the thyristor and the magnetic latching relay is used to realize soft closing and soft opening control of large current. The flexible charging socket adopts a composite switch consisting of a thyristor and a magnetic latching relay. The AC large current power supply is completed by the thyristor when the voltage passes through zero, when the current passes through zero, and when the relay hard contacts during the freewheeling period, so as to avoid contact failure caused by the relay contact switching large current loads.

[0133] The flexible portable charging pile includes a single-phase / three-phase charging gun 8;

[0134] The rated current output by the single-phase / three-phase charging gun 8 is 50A;

[0135] The current capacity range of the flexible portable charging pile is 8A-63A.

[0136] The flexible charging socket includes an output single-phase / three-phase socket 2, a circuit breaker 3, a situation mode button 4, a situation mode display 5 and a situation indication 6;

[0137] The maximum output current of the output single-phase / three-phase socket 2 is 60A, and the number of the output single-phase / three-phase sockets 2 is not less than 3.

[0138] The flexible charging socket comprises a master flexible charging socket and a slave flexible charging socket, and the flexible charging socket and the AC charging pile are provided with a power input plug; data is exchanged between the flexible charging socket and the flexible charging pile, and between the master flexible charging socket and the slave flexible charging socket through embedded power line carrier communication to realize flexible charging control;

[0139] Preferred are:

[0140] The charging gun is designed to comply with the IEC61851 international standard to ensure compatibility and safety with the electric vehicle charging port. The built-in intelligent sensing module can identify and adapt to the rated charging parameters of different electric vehicles.

[0141] The charging pile automatically senses the charging needs of the electric vehicle and automatically adjusts the output power, ranging from single-phase 3.5KW to three-phase 60KW, supporting single-phase and three-phase charging modes to adapt to different grid conditions and electric vehicle charging interfaces.

[0142] The charging pile and the flexible charging socket share information through advanced data interaction technology. Using the adaptive algorithm mentioned above, the charger can adjust the charging current in real time to ensure that it matches the input power of the socket.

[0143] The design of the charging pile ensures the stable operation of the entire charging system under limited input power, avoiding overload and grid shock. Through intelligent control, the charger can reasonably allocate grid capacity when multiple electric vehicles are charged at the same time.

[0144] At the same time, the charging pile design meets the protection requirements of the outdoor environment, has an IP65 protection level, can adapt to various climatic conditions, and has built-in multiple safety protection mechanisms, including overcurrent, overheating, and short-circuit protection to ensure the safety of the charging process; the charging pile adopts efficient power conversion technology to reduce energy loss and improve charging efficiency. The low power consumption design extends the service life of the charging pile and reduces maintenance costs.

[0145] At the same time, the design of the charging pile takes into account future technological upgrades and expansions, supports compatibility with new electric vehicles and charging technologies, supports power supply standards in different regions around the world, and has wide applicability.

[0146] like Figure 4 As shown, it shows a schematic diagram of a link-expanded flexible charging system of the present invention, wherein the flexible charging socket adopts a multi-socket link-expanded structure;

[0147] The multi-socket link expansion structure adopts a serial link method to link multiple flexible charging sockets to form a multi-level charging pile flexible AC charging system. The advantage is that it can charge more than 5 electric vehicles at the same time; the first flexible socket of this link architecture serves as the main socket, and the subsequent flexible sockets are connected as slave sockets and are controlled by the main socket.

[0148] like Figure 5 As shown, it shows the working flow chart of the flexible charging system of the present invention, and the process is as follows: first, start using the portable AC flexible charger and plug it into the AC charging port of the electric vehicle. The AC charging port uses the sensing module to detect the rated charging parameters of the electric vehicle. The processing module automatically provides a single-phase or three-phase charging power with a rated power of 3.5KW to 60KW according to the received rated power of the electric vehicle to be charged. At the same time, the processing module uses the adaptive algorithm to calculate the actual charging current of the electric vehicle and the controlled current of the input power supply of the charging socket according to the provided charging power, and matches the actual charging current with the controlled current of the input power supply of the charging socket to ensure that the entire flexible charging system works stably under the limited input power.

[0149] Specific embodiment: The flexible charging system can provide single-phase or rated AC voltages of 110V, 220V, 380V, 400V and 440V, and rated AC currents of 8A, 12A, 16A, 24A, 40A and 50A respectively, and control and adjust the actual charging power by sensing the characteristic parameters of the on-board charger, the flexible charging socket and the set flexible charging mode.

[0150] The flexible charging system can automatically control the power of the power consumption and charging loads when the sum of the rated power of multiple power consumption and charging loads is greater than the rated capacity power of the power supply, so that the actual power consumption and charging power are always less than or equal to the rated capacity power of the power supply, and complete the load power supply and charging of multiple electric vehicles. The control calculation formula is as follows:

[0151] Electric load power control calculation: P Ln =K p ×S p ×K t ×Pr Ln Formula (1) Charging load power control calculation: P Cn =K p ×S p ×K t ×Pr Cn Formula (2) Power supply control calculation: P S =∑P Cn +∑P Ln Formula (3) Power supply power limit control calculation: Pr s ≧P S Formula (4)

[0152] Among them, K p is the socket output power factor, S p is the time window coefficient; K t is the temperature coefficient; n is the number of the power load or charging load, Pr s Ps is the rated capacity power of the power supply; c Pr is the actual power supply; L1 , Pr L2 ,,,Pr Ln P is the rated power of the electrical load; L1 , P L2 ,,,P Ln Pr is the actual power of the electrical load; c1 , Pr c2 ,,,Prcn is the rated power of the charging load; P c1 , P c2 ,,,P cn is the actual power of the charging load, P s It is the actual capacity power of power supply;

[0153] Monitoring and calculation are performed through the situation awareness elements of the flexible charging socket and the flexible portable AC charging pile, and the situation data are exchanged and calculated between the charging piles using the electrically connected power line carrier communication, and power control of the charging system power load and charging load is achieved according to formulas (1) to (4).

[0154] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Flexible charging pile charging system based on situational awareness and interactive control, Features: It includes processing module, perception module, control module, communication module, power module, monitoring and protection module, and remote module; The sensing module is electrically connected to the processing module, the control module is electrically connected to the processing module, the communication module is electrically connected to the processing module, the power module is electrically connected to the processing module, the monitoring and protection module is electrically connected to the processing module, and the remote module is electrically connected to the communication module; The processing module is used for the charging system to perform edge computing processing operations and to perform adaptive computing for charging multiple electric vehicles simultaneously; The sensing module monitors the current, voltage, power, electricity, and temperature parameters of the charging system in real time; The control module performs power control operation on the charging system by receiving the control signal from the processing module; The communication module exchanges data with the processing module and the monitoring and protection module using the embedded power line carrier and interface protocol; The power module provides AC power to the flexible charging system; The monitoring and protection module monitors the temperature, current, grounding and short circuit of the charging system in real time; The remote module is connected to the IoT platform via a wireless IoT communication interface and protocol.

2. According to claim 1, the flexible charging pile charging system based on situational awareness and interactive control, Features: The sensing module includes a sensing element; The sensing elements include a position sensing element, a socket waterproof cover position sensing element, a temperature control sensing element, a relay contact welding sensing element, a fuse blowing sensing element, a B-type residual current sensing element and a grounding detection sensing element; The position sensing element is respectively placed at the power input plug of the flexible charging socket and the charging pile, and the power output socket is plugged into the position sensing element through the plug. If any phase input current at the power plug exceeds the set value and hot plugging is performed, the load current will be quickly reduced or turned off; The socket waterproof cover position sensing element is placed at the output end of the flexible charging socket. When any phase input current of the plug exceeds the set value and the waterproof cover is opened, the socket waterproof cover position sensing element will quickly shut off the load current through the socket waterproof cover position sensing element. The temperature sensing element is placed at the power input end of the flexible charging socket and the charging pile. When the temperature exceeds the set value, the load current is reduced or shut down through the temperature sensing element; The relay contact welding sensing element can alarm and lock the power supply operation when any contact of the relay inside the device of the flexible charging pile has a welding failure; When the fuse inside the device of the flexible charging pile is blown, the fuse blown sensing element performs a blown alarm prompt and locks the power supply operation; When the leakage current inside the device of the flexible charging pile exceeds the set limit, the B-type residual current sensing element issues a leakage alarm and cuts off the power supply output; When the grounding detection sensing element detects that the grounding wire is not reliably grounded inside the device of the flexible charging pile, it issues an alarm prompt for unreliable grounding of the grounding wire and cuts off the power supply output.

3. According to claim 1, the flexible charging pile charging system based on situational awareness and interactive control, Features: The control module includes a fuse, a magnetic latching relay, a charging relay and a high current controller; The charging relay uses a control mode in which a 12V power supply is pulled in for 200ms to switch between a 5V or 3.3V power supply, thereby reducing power consumption in the charging system; The high current controller uses a thyristor in a magnetic latching relay hard contact mode to control the high current in the charging system.

4. According to claim 1, the flexible charging pile charging system based on situational awareness and interactive control, Features: The monitoring module includes position monitoring, temperature monitoring, current monitoring, grounding monitoring and short circuit monitoring; The position monitoring uses the position sensing element to monitor the input conditions at the power input plug and the power output socket of the flexible charging socket and the charging pile, and uses the socket waterproof cover position sensing element to monitor the input condition at the power plug; The temperature monitoring uses the temperature sensing element to monitor whether the temperature of the power input terminal exceeds a temperature setting value, and the temperature setting value is 45° C.; The grounding detection monitors whether the grounding wire inside the device of the flexible charging pile is reliably grounded; Finally, the monitoring report inside the device of the flexible charging pile is output to the processing module.

5. According to claim 1, the flexible charging pile charging system based on situational awareness and interactive control, Features: The remote module uses 4G, 5G, WiFi, and NFC wireless IoT communication interfaces and protocols to achieve connection with the IoT platform; The charging system also includes a user end, which is connected to a mobile phone APP via Bluetooth. The mobile phone APP can collect and display the status data of the flexible charging socket and the charging pile, set the operating mode, and receive alarm prompts.

6. Flexible charging equipment of flexible charging pile charging system based on situational awareness and interactive control, Features: The flexible charging device comprises a power input single-phase / three-phase plug (1), a flexible charging socket, a portable AC charging pile and a high-power electrical load; The high-power electrical load and the portable AC charging pile are plugged into the flexible charging socket; The flexible charging socket is a composite switch composed of a thyristor and a magnetic latching relay.

7. The flexible charging device of the flexible charging pile charging system based on situational awareness and interactive control according to claim 6, Features: The flexible charging socket comprises an output single-phase / three-phase socket (2), a circuit breaker (3), a situation mode button (4), a situation mode display (5) and a situation indication (6); The maximum output current of the output single-phase / three-phase socket (2) is 60A, and the number of the output single-phase / three-phase sockets (2) is not less than 3.

8. The flexible charging device of the flexible charging pile charging system based on situational awareness and interactive control according to claim 6, Features: The flexible charging socket comprises a main flexible charging socket and a slave flexible charging socket, and the flexible charging socket and the AC charging pile are provided with the power input single-phase / three-phase plug (1) via a cable. Flexible charging control is achieved by exchanging data between the flexible charging socket and the flexible charging pile, and between the master flexible charging socket and the slave flexible charging socket through embedded power line carrier communication.

9. The flexible charging device of the flexible charging pile charging system based on situational awareness and interactive control according to claim 8, Features: The flexible charging socket adopts a multi-socket link expansion structure; The multi-socket link expansion structure adopts a serial link method to link multiple flexible charging sockets to form a multi-level charging pile flexible AC charging system, which can charge more than 5 electric vehicles at the same time; the first flexible socket of this link architecture serves as the main socket, and the subsequent flexible sockets are connected as slave sockets and are controlled by the main socket.

10. The flexible charging device of the flexible charging pile charging system based on situational awareness and interactive control according to claim 6, Features: The flexible portable charging station comprises a single-phase / three-phase charging gun (8); The rated current output by the single-phase / three-phase charging gun (8) is 50A; The current capacity range of the flexible portable charging pile is 8A-63A.

11. Calculation method of flexible charging pile charging system based on situation awareness and interactive control, Features: The following calculation method is performed using the system as described in any one of claims 1 to 6: The flexible charging system can automatically control the power of the power consumption and charging loads when the sum of the rated power of multiple power consumption and charging loads is greater than the rated capacity power of the power supply, so that the actual power consumption and charging power are always less than or equal to the rated capacity power of the power supply, and complete the load power supply and charging of multiple electric vehicles. The control calculation formula is as follows: Electric load power control calculation: P Ln =K p ×S p ×K t ×Pr Ln Formula (1) Charging load power control calculation: P Cn =K p ×S p ×K t ×Pr Cn Formula (2) Power supply control calculation: P S =∑P Cn +∑P Ln Formula (3) Power supply power limit control calculation: Pr s ≧P S Formula (4) Among them, K p is the socket output power factor, S p is the time window coefficient; K t is the temperature coefficient; n is the number of the power load or charging load, Pr s Ps is the rated capacity power of the power supply; c Pr is the actual power supply; L1 , Pr L2 ,,,Pr Ln P is the rated power of the electrical load; L1 , P L2 ,,,P Ln Pr is the actual power of the electrical load; c1 , Pr c2 ,,,Pr cn is the rated power of the charging load; P c1 , P c2 ,,,P cn is the actual power of the charging load, P s It is the actual capacity power of power supply; Monitoring and calculation are performed through the situation awareness elements of the flexible charging socket and the flexible portable AC charging pile, and the situation data are exchanged and calculated between the charging piles using the electrically connected power line carrier communication, and power control of the charging system power load and charging load is achieved according to formulas (1) to (4).

12. The calculation method of the flexible charging pile charging system based on situational awareness and interactive control according to claim 11, Features: If the output circuit of the flexible charging socket and the charging pile fails, the AC small signal injection detection method is used to connect the output circuit to the load to determine whether a short circuit occurs or the impedance parameter is lower than the set value before starting the power supply. When a short circuit is detected or the impedance parameter is lower than the set value, the power supply operation will be locked to avoid causing a safety accident. The detection steps and calculation method are as follows: Step 1: Output circuit load characteristic detection: Set the three-phase power supply switch K of the charging socket a , K b ,,K c and the three-phase detection injection switch Ki of the charging device a 、Ki b ,、Ki c disconnect Normal voltage measurement V a \V b \V c =Kvt×(Vr a \Vr b \Vr c ) Formula (5) Step 2: Measure the corresponding phase voltage. Any output circuit or load phase line and V n A short circuit occurs, and the corresponding phase voltage measurement value is less than the short circuit limit Vs l , Voltage measurement value: V a \V b \V c ≤Vs l , formula (6) Step 3: Determine whether the voltage vector value detected by the corresponding phase voltage is equal to the vector value of the third phase. If phases A and B are short-circuited, ∠V a +∠V b =∠V c Formula (7) If phases A and C are short-circuited, ∠V a +∠V c =∠V b Formula (8) If phases B and C are short-circuited, ∠V b +∠V c =∠V a Formula (9) Step 4: Check the output circuit load characteristics Set the three-phase power supply switch K of the charging socket a , K b ,,K c Disconnect, three-phase detection injection switch Ki a 、Ki b 、Ki c Close, three-phase measurement current limiting resistor R a , R b ,、R c The internal resistance Rvt of the three-phase current transformer VT a , Rvt b , Rvt c The ratio is >1000, the output circuit load characteristic measurement calculation formula is: Injection detection current: I a , I b , I c = (Vr a , Vr b , Vr c ) / (R a , R b , R c ) Formula (10) Load impedance: I a ×AL×Rvt a =V a / Kvt×(AL+Rvt a ) Formula (11) AL×(I a ×Rvt a -V a / Kvt)=V a / Kvt×Rvt a formula(12) AL=Va / Kvt×Rvt a / (I a ×Rvt a -V a / Kvt) formula(13) The BL and CL calculation results can also be obtained using the above method. Among them, Vr a 、Vr b 、Vr c is the three-phase rated input voltage; V a \V b \V c I is the three-phase measured voltage; a ,I b ,I c Inject measurement current into three phases; K a , K b ,,K c It is a three-phase power supply switch; Ki a 、Ki b 、Ki c Injection switch for three-phase detection; R a , R b , R c For three-phase measurement of current limiting resistance; Rvt a , Rvt b , Rvt c is the internal resistance of the three-phase current transformer VT; VT a VT b ,,VT c It is a three-phase AC voltage transformer; V n is the neutral point of three-phase AC; Kvt is the transformation ratio coefficient of the measuring voltage transformer; AL, BL, and CL are the three-phase AC load impedances; Vs l It is the measurement limit of phase-to-neutral short-circuit voltage.

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