A charging load dynamic security control method and a charging system

Abstract

The application discloses a charging load dynamic safety control method and a charging system, relates to the technical field of charging pile operation safety management and control, and aims to solve the technical problem that the prior art cannot be applied to a charging pile sharing scenario. The method comprises the following steps: determining a safety total power threshold according to target node electrical parameters; collecting data of a charging loop to obtain total power consumption of the charging loop and charging cable temperature; obtaining residual available power according to the safety total power threshold and the total power consumption of the charging loop; and performing dynamic safety control on the charging loop load according to a target control strategy determined by the residual available power and the charging cable temperature; wherein the target control strategy is a normal charging strategy, a power reduction strategy, a charging suspension strategy or a charging cutoff strategy. Therefore, the application can realize safety, intelligence and dynamic load management and control of an indoor loop in a private charging pile sharing scenario through a "residual available power + charging cable temperature" double safety criterion.

Description

Technical Field

[0001] This application relates to the field of charging pile operation safety management technology, and provides a method for dynamic safety control of charging load and a charging system. Background Technology

[0002] With the continuous increase in the number of new energy vehicles, the number of private charging piles installed in residential communities (especially underground garages) has been increasing year by year. Since private charging piles generally share line resources with the household's power supply circuit, their rated capacity is usually limited by the rated current parameters of the household air switch (circuit breaker). Therefore, in the scenario where private charging piles are shared and opened for use by others, the electricity consumption behavior of private charging piles is unpredictable. Furthermore, with the simultaneous operation of high-power appliances (air conditioners, water heaters, induction cookers, heating equipment, etc.) in the home, the total load pressure on the household circuit is further aggravated.

[0003] Currently, the industry routinely uses solutions such as "fixed power limit," "simple overload protection," and "single-dimensional monitoring" for the safety management of charging piles. However, these existing technologies obviously have the following specific shortcomings in the context of shared private charging piles: (1) Fixed power cannot adapt to dynamic load: When household electricity consumption is at a low point (such as late at night), the inlet circuit still has a large margin, but the private charging pile still operates at a conservative power, resulting in a serious waste of charging efficiency; conversely, when household electricity consumption peaks, the fixed power plus the household load can easily cause the total power to exceed the rated capacity of the inlet switch.

[0004] (2) Lack of real-time perception of total household load: Private charging piles cannot know the actual total power consumption of the household circuit and make judgments based only on their own output, which can easily lead to the phenomenon of "blind charging". That is, private charging piles believe that they have not exceeded the limit, but after adding the household load, it has far exceeded the carrying capacity of the household line.

[0005] (3) Safety redundancy without temperature dimension: Existing solutions do not consider the temperature rise effect of cables and terminals. Under high ambient temperature, long-term high load operation or increased contact resistance, even if the current does not reach the limit value, the cable may still cause the insulation to age faster due to continuous heating or even cause fire hazards.

[0006] (4) The protection strategy is too crude: once an overload is triggered, the circuit breaker will trip to achieve hard disconnection, which not only interrupts the charging process and affects the user experience, but also the frequent switching operations will accelerate the aging and damage of electrical components.

[0007] (5) No automatic recovery capability: After the protection is triggered, the user must manually reset and restart. For non-pillar owners in the shared scenario, the operation threshold is high and the timeliness cannot be guaranteed.

[0008] Furthermore, based on these shortcomings, the following chain reactions are likely to occur: frequent tripping of the circuit breaker at the household entrance leads to power outages and charging interruptions; long-term overload and overheating of cables increases the risk of electrical fires; low charging efficiency prolongs charging waiting time; poor user experience in shared charging leads to reduced willingness to use the service. Existing technologies are limited by single-dimensional monitoring capabilities and fixed threshold strategies. Conventional optimization methods (such as simply lowering the power limit) can alleviate some problems, but cannot fundamentally solve the contradiction between dynamic load changes and fixed safety boundaries.

[0009] Therefore, how to dynamically and safely control the load on the inbound circuit for private charging pile sharing scenarios has become an urgent problem to be solved. Summary of the Invention

[0010] This application provides a dynamic safety control method and charging system for charging load, which solves the technical problem that the existing technology cannot be applied to the scenario of sharing private charging piles.

[0011] On the one hand, a method for dynamic safety control of charging load is provided, the method comprising: The total safe power threshold is determined based on the electrical parameters of the target node; wherein, the electrical parameters of the target node include the rated current of the target node switch of the charging pile, the nominal cross-sectional area of ​​the charging cable, and the service life of the line; Real-time data collection of the charging circuit of the charging pile to obtain the total power consumption of the charging circuit and the temperature of the charging cable; The remaining available power is obtained based on the safe total power threshold and the total power consumption of the charging circuit; The target control strategy is determined based on the remaining available power and the temperature of the charging cable; wherein the target control strategy is a normal charging strategy, a power reduction strategy, a pause charging strategy, or a disconnect charging strategy. Based on the target control strategy, dynamic safety control is performed on the charging circuit load.

[0012] Optionally, the target node is an in-home node, and the step of determining the safe total power threshold based on the electrical parameters of the target node includes: During initial power-on initialization or parameter changes, the system reads the user-pre-configured rated current of the inlet switch, the nominal cross-sectional area of ​​the charging cable, and the years of service of the line. Based on the nominal cross-sectional area of ​​the charging cable, obtain the safe current carrying capacity of the charging cable from the cable specification mapping table; The safe total power threshold is obtained based on the preset power threshold calculation formula, safe current carrying capacity, rated current of the incoming switch, and the service life of the line.

[0013] Optionally, the target node is an in-home node, the charging circuit is an in-home circuit, and the step of real-time data acquisition of the charging circuit of the charging pile to obtain the total power consumption of the charging circuit and the temperature of the charging cable includes: The instantaneous current of the incoming circuit is continuously collected to obtain multiple instantaneous currents; The sliding window algorithm is used to process the multiple instantaneous currents to obtain the effective value current. The total power consumption of the incoming circuit is obtained based on the preset total power consumption calculation formula and the effective current. The temperature of the cable in the inlet circuit is continuously collected to obtain multiple raw temperature values; The maximum value among the multiple original temperature values ​​is taken as the charging cable temperature.

[0014] Optionally, the target node is an in-home node, the charging circuit is an in-home circuit, and the charging pile is a private charging pile. The step of obtaining the remaining available power based on the safe total power threshold and the total power consumption of the charging circuit includes: The remaining available power is determined by using a preset formula for calculating the remaining available power, a safe total power threshold, and the total power consumption of the incoming circuit; Determine if the remaining available power is negative; If the remaining available power is determined to be negative, then the remaining available power is set to zero; If it is determined that the remaining available power is not negative, then obtain the current actual output power of the private charging pile; The power margin is obtained based on the preset power margin calculation formula, the remaining available power, and the current actual output power.

[0015] Optionally, the target node is an in-home node, the charging circuit is an in-home circuit, and the step of determining the target control strategy based on the remaining available power and the charging cable temperature includes: Determine if there is any abnormality in the incoming circuit; wherein, the abnormality includes sudden current changes or a sudden temperature rise; If an anomaly is determined in the inlet circuit, the target control strategy is to cut off the charging. If it is determined that there is no abnormality in the inlet circuit, the target control strategy is determined based on the remaining available power and the temperature of the charging cable.

[0016] Optionally, the step of determining the target control strategy based on the remaining available power and the charging cable temperature includes: If it is determined that the remaining available power is not less than the current actual output power, and the charging cable temperature is less than the warning temperature threshold, then the target control strategy is determined to be the normal charging strategy. If it is determined that the remaining available power is less than the current actual output power, or the charging cable temperature is between the warning temperature threshold and the critical temperature threshold, then the target control strategy is determined to be a power reduction strategy. If it is determined that the remaining available power is less than the reduced actual output power, or the charging cable temperature is not less than the critical temperature threshold, then the target control strategy is determined to be the pause charging strategy.

[0017] Optionally, the step of determining the target control strategy as a power reduction strategy includes: If the power margin is determined to be less than the preset power threshold, the target control strategy is determined to be a low-power reduction strategy; wherein, the power margin is determined by the remaining available power and the current actual output power. If the power margin is determined to be no less than the preset power threshold, then the target control strategy is determined to be a medium power reduction strategy.

[0018] Optionally, the target control strategy is a pause charging strategy. After dynamically controlling the charging circuit load according to the target control strategy, the method further includes: Send an emergency event report to the cloud-based early warning platform; wherein the emergency event report includes the current event type, total power consumption of the inbound circuit, charging cable temperature and event timestamp; The cloud-based early warning platform is used to push early warning messages to the terminal devices of the charging pile owner and the terminal devices of the current charging users; wherein, the early warning message is used to inform the reason for the suspension and the expected resumption conditions.

[0019] Optionally, the target control strategy is a charging pause strategy, the charging pile is a private charging pile, and after dynamically and safely controlling the charging circuit load according to the target control strategy, the method further includes: If it is determined that the remaining available power is not less than the preset minimum recovery power and the charging cable temperature is less than the normal upper limit temperature threshold, then it is determined whether the actual output power obtained from N consecutive samplings is within the preset safety range; where N is a positive integer. If it is determined that the actual output power obtained from N consecutive samplings is within the preset safety range, then the actual output power of the private charging pile will be gradually increased according to the preset power recovery slope.

[0020] On the one hand, a charging system is provided, including a controller, the controller being used to execute the dynamic safety control method for charging load as described in any of the above claims.

[0021] On the one hand, an electronic device is provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the dynamic safety control method for charging load described in any of the above claims.

[0022] On the one hand, a storage medium is provided that stores computer program instructions thereon, which, when executed by a processor, implement any of the above-mentioned dynamic safety control methods for charging load.

[0023] Compared with the prior art, the beneficial effects of this application are as follows: In this application, when dynamically controlling the load of the charging circuit, firstly, a safe total power threshold can be determined based on the electrical parameters of the target node; wherein, the electrical parameters of the target node include the rated current of the target node switch of the charging pile, the nominal cross-sectional area of ​​the charging cable, and the service life of the line; then, data of the charging circuit of the charging pile can be collected in real time to obtain the total power consumption of the charging circuit and the temperature of the charging cable; next, the remaining available power can be obtained based on the safe total power threshold and the total power consumption of the charging circuit; then, a target control strategy can be determined based on the remaining available power and the temperature of the charging cable; wherein, the target control strategy includes a normal charging strategy, a power reduction strategy, a charging pause strategy, or a charging cut-off strategy; finally, dynamic safety control of the charging circuit load can be performed based on the target control strategy.

[0024] Based on this, in this application, since the charging circuit of the charging pile is collected in real time, the total power consumption of the charging circuit and the temperature of the charging cable are obtained. Therefore, compared with the prior art, this application can lay the foundation for subsequent dynamic safety control based on the total power consumption of the charging circuit, thereby preventing the occurrence of "blind charging".

[0025] Furthermore, since the target control strategy for dynamic safety control of the charging circuit load is determined based on the remaining available power and the charging cable temperature, compared to existing technologies (e.g., fixed power limiting schemes), this application can move away from the crude "fixed power" mode through the dual safety criteria of "remaining available power + charging cable temperature," enabling the charging pile to "adaptively" adjust according to real-time operating conditions. That is, through the "remaining available power" criterion, intelligent "peak shaving" can be performed, automatically reducing the charging power when the total household load is too high to avoid tripping. At the same time, through the "charging cable temperature" criterion, intervention can be carried out in the early stages of abnormal temperature rise to prevent problems before they occur. Thus, safe, intelligent, and dynamic load management of the charging circuit in the shared charging pile scenario can be achieved. Furthermore, since four progressive strategies—normal charging, power reduction, paused charging, and disconnected charging—can be used to dynamically and safely control the load on the charging circuit, compared to the crude existing technology (which can only charge normally or trip), this application can not only eliminate the "cliff-like" experience and ensure charging continuity, thus improving the user experience, but also achieve "flexible" adjustment, significantly reducing the impact and wear on electrical components, and increasing equipment lifespan. This greatly enhances the robustness and fault tolerance of the system. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0027] Figure 1 An overall architecture diagram of the dynamic safety control system for the inlet circuit load provided in this application embodiment; Figure 2 A hardware connection diagram between the central processing unit and other modules provided in an embodiment of this application; Figure 3 A flowchart illustrating a dynamic safety control method for charging load provided in an embodiment of this application; Figure 4 A flowchart illustrating the target control strategy provided in this application embodiment; Figure 5 This is a schematic diagram of a charging system provided in an embodiment of this application.

[0028] The diagram shows the following labels: 110 - power module, 120 - charging interface, 130 - controller, and 140 - power distribution device. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. Unless otherwise specified, the embodiments and features in the embodiments of this application can be arbitrarily combined with each other. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than that shown here.

[0030] With the continuous increase in the number of new energy vehicles, the number of private charging piles installed in residential communities (especially underground garages) has been increasing year by year. Since private charging piles generally share line resources with the household's power supply circuit, their rated capacity is usually limited by the rated current parameters of the household air switch (circuit breaker). Therefore, in the scenario where private charging piles are shared and opened for use by others, the electricity consumption behavior of private charging piles is unpredictable. Furthermore, with the simultaneous operation of high-power appliances (air conditioners, water heaters, induction cookers, heating equipment, etc.) in the home, the total load pressure on the household circuit is further aggravated.

[0031] Currently, the industry routinely uses solutions such as "fixed power limit," "simple overload protection," and "single-dimensional monitoring" for the safety management of charging piles. However, these existing technologies obviously have the following specific shortcomings in the context of shared private charging piles: (1) Fixed power cannot adapt to dynamic load: When household electricity consumption is at a low point (such as late at night), the inlet circuit still has a large margin, but the private charging pile still operates at a conservative power, resulting in a serious waste of charging efficiency; conversely, when household electricity consumption peaks, the fixed power plus the household load can easily cause the total power to exceed the rated capacity of the inlet switch.

[0032] (2) Lack of real-time perception of total household load: Private charging piles cannot know the actual total power consumption of the household circuit and make judgments based only on their own output, which can easily lead to the phenomenon of "blind charging". That is, private charging piles believe that they have not exceeded the limit, but after adding the household load, it has far exceeded the carrying capacity of the household line.

[0033] (3) Safety redundancy without temperature dimension: Existing solutions do not consider the temperature rise effect of cables and terminals. Under high ambient temperature, long-term high load operation or increased contact resistance, even if the current does not reach the limit value, the cable may still cause the insulation to age faster due to continuous heating or even cause fire hazards.

[0034] (4) The protection strategy is too crude: once an overload is triggered, the circuit breaker will trip to achieve hard disconnection, which not only interrupts the charging process and affects the user experience, but also the frequent switching operations will accelerate the aging and damage of electrical components.

[0035] (5) No automatic recovery capability: After the protection is triggered, the user must manually reset and restart. For non-pillar owners in the shared scenario, the operation threshold is high and the timeliness cannot be guaranteed.

[0036] Furthermore, based on these shortcomings, the following chain reactions are likely to occur: frequent tripping of the circuit breaker at the household entrance leads to power outages and charging interruptions; long-term overload and overheating of cables increases the risk of electrical fires; low charging efficiency prolongs charging waiting time; poor user experience in shared charging leads to reduced willingness to use the service. Existing technologies are limited by single-dimensional monitoring capabilities and fixed threshold strategies. Conventional optimization methods (such as simply lowering the power limit) can alleviate some problems, but cannot fundamentally solve the contradiction between dynamic load changes and fixed safety boundaries.

[0037] Based on this, this application provides a dynamic safety control method for charging load. In this method, firstly, a safe total power threshold can be determined based on the electrical parameters of the target node; wherein, the electrical parameters of the target node include the rated current of the target node switch of the charging pile, the nominal cross-sectional area of ​​the charging cable, and the service life of the line; then, data can be collected in real time from the charging circuit of the charging pile to obtain the total power consumption of the charging circuit and the temperature of the charging cable; next, the remaining available power can be obtained based on the safe total power threshold and the total power consumption of the charging circuit; then, a target control strategy can be determined based on the remaining available power and the temperature of the charging cable; wherein, the target control strategy includes a normal charging strategy, a power reduction strategy, a charging pause strategy, or a charging cut-off strategy; finally, dynamic safety control of the charging circuit load can be performed based on the target control strategy.

[0038] Based on this, in this application, since the charging circuit of the charging pile is collected in real time, the total power consumption of the charging circuit and the temperature of the charging cable are obtained. Therefore, compared with the prior art, this application can lay the foundation for subsequent dynamic safety control based on the total power consumption of the charging circuit, thereby preventing the occurrence of "blind charging".

[0039] Furthermore, since the target control strategy for dynamic safety control of the charging circuit load is determined based on the remaining available power and the charging cable temperature, compared to existing technologies (e.g., fixed power limiting schemes), this application can move away from the crude "fixed power" mode through the dual safety criteria of "remaining available power + charging cable temperature," enabling the charging pile to "adaptively" adjust according to real-time operating conditions. That is, through the "remaining available power" criterion, intelligent "peak shaving" can be performed, automatically reducing the charging power when the total household load is too high to avoid tripping. At the same time, through the "charging cable temperature" criterion, intervention can be carried out in the early stages of abnormal temperature rise to prevent problems before they occur. Thus, safe, intelligent, and dynamic load management of the charging circuit in the shared charging pile scenario can be achieved. Furthermore, since four progressive strategies—normal charging, power reduction, paused charging, and disconnected charging—can be used to dynamically and safely control the load on the charging circuit, compared to the crude existing technology (which can only charge normally or trip), this application can not only eliminate the "cliff-like" experience and ensure charging continuity, thus improving the user experience, but also achieve "flexible" adjustment, significantly reducing the impact and wear on electrical components, and increasing equipment lifespan. This greatly enhances the robustness and fault tolerance of the system.

[0040] After introducing the design concept of the embodiments of this application, the following is a brief introduction to the application scenarios to which the technical solutions of the embodiments of this application can be applied. It should be noted that the application scenarios described below are only for illustrating the embodiments of this application and are not intended to limit the scope. In specific implementation, the technical solutions provided by the embodiments of this application can be flexibly applied according to actual needs.

[0041] In this application, the target node can be a power connection node at a charging station, an access node in a residential parking lot, etc. Based on this, taking an access node as an example, such as... Figure 1 The diagram shown is an overall architecture diagram of the dynamic safety control system for the inlet circuit load provided in this application embodiment. The overall architecture diagram shows the data flow and control relationship of the three major areas: the inlet power distribution side, the safety control system, and the charging execution side.

[0042] Specifically, on the inlet power distribution side, the mains power grid (e.g., 22V / 380V) can control the household power branch to supply power to household loads (e.g., air conditioners, water heaters, and lighting) via the inlet circuit breaker.

[0043] On the charging execution side, the electric vehicle (EV) can be powered by the AC / DC charging pile itself.

[0044] In this application, as Figure 1 As shown, the safety control system consists of several parts: a household load acquisition module, a cable temperature monitoring module, a charging pile power adjustment module, a central processing unit, and a cloud-based early warning platform.

[0045] The household load acquisition module can be installed on the outgoing side of the household air switch or inside the distribution box. Specifically, it may include an open-type Hall current transformer and a high-speed ADC conversion circuit. During real-time data acquisition, it collects the total three-phase or single-phase current of the household circuit in real time with a sampling period of 100ms, and calculates the total power consumption of the household circuit. The load is then uploaded to the central processing unit via the I2C / SPI interface. The measurement range of this household load acquisition module covers 0~100A (corresponding to 0~23kW@230V), and the measurement accuracy is not less than ±0.5%.

[0046] The cable temperature monitoring module may specifically include at least two negative temperature coefficient (NTC) thermistor temperature sensors. These NTC thermistor temperature sensors can be respectively laid on the surface of the charging cable of the charging pile and at the connection of the terminal block at the entrance of the house to monitor the charging cable temperature T(t) of the charging cable body and key nodes in real time. The temperature sensor has a temperature measurement range of -40℃ to +125℃, an accuracy of not less than ±0.3℃, and a sampling period of 500ms. The temperature data is transmitted to the central processing unit through a single-wire bus or analog channel (ADC).

[0047] The charging pile power adjustment module can be located inside the main control board of the charging pile or as an independent external device. It is used to receive the power adjustment command Pcmd issued by the central processing unit. By adjusting the duty cycle of the pulse width modulation (PWM) signal, it controls the output power of the DC-DC converter or AC-DC rectifier, thereby changing the power Pout delivered by the charging pile to the electric vehicle. The adjustment range covers 0% to 100% of the rated power, the adjustment step size is not less than 100W, and the response delay is not more than 200ms.

[0048] The central processing unit, as the core computing and decision-making component of the safety control system, can be implemented using a microcontroller (e.g., STM32 series), embedded processor, or programmable logic controller (PLC). It is mainly responsible for performing the following functions: (1) Calculating the total safe power threshold based on the rated current In of the inlet switch, the nominal cross-sectional area S of the charging cable, and the service life t_age of the line. (2) Read the total power consumption of the incoming circuit at a period of 100ms. Calculate the remaining usable power based on the charging cable temperature T(t). = - (3) Conduct a safety status assessment and determine the response level based on the dual-variable joint criterion of "remaining available power - charging cable temperature"; (4) Output control command Pcmd to the charging pile power adjustment module; (5) Trigger the highest level of protection when an abnormal state is detected and push early warning information to the cloud.

[0049] The cloud-based early warning platform can be deployed on a remote server and connects to the central processing unit via a network communication module (supporting protocols such as MQTT and TCP / IP). It is used to receive and store system operation data and push real-time early warning information (such as SMS, APP notifications, and mini-program messages) to the terminal devices of the charging pile owner and the current charging users when a security incident occurs. It also provides historical data query, trend analysis, and remote parameter configuration functions.

[0050] In one possible implementation, such as Figure 2 The diagram shown is a hardware connection diagram between the central processing unit and other modules provided in an embodiment of this application.

[0051] Specifically, the central processing unit can be electrically connected to five peripheral modules: the household load acquisition module, the cable temperature monitoring module, the charging pile power regulation module, the communication network module, and the non-volatile memory module. The non-volatile memory module can be EEPROM / Flash and is used to store the safe total power threshold. It includes parameter configuration, fault snapshot recording, and operation logs; the communication network module can communicate via Wi-Fi / 4G / Ethernet, supports protocols such as MQTT and TCP / IP, and can perform bidirectional data transmission with the cloud-based early warning platform, facilitating remote monitoring and firmware upgrades.

[0052] Both the household load acquisition module and the non-volatile storage module can be electrically connected to the central processing unit via the I2C / SPI interface.

[0053] The cable temperature monitoring module can be electrically connected to the central processing unit via One-Wire / ADC.

[0054] The charging pile power regulation module can be electrically connected to the central processing unit via PWM / CAN.

[0055] The communication network module can be electrically connected to the central processing unit via a Universal Asynchronous Receiver / Transmitter (UART) / SPI.

[0056] The method of the embodiments of this application will now be described in conjunction with the accompanying drawings.

[0057] like Figure 3 The diagram shown is a flowchart of a dynamic safety control method for charging load provided in an embodiment of this application. This method can... Figure 1 The method is implemented by the dynamic safety control system for the load of the inbound circuit. The specific process is described below.

[0058] Step 301: Determine the safe total power threshold based on the electrical parameters of the target node.

[0059] The electrical parameters of the target node include the rated current of the target node switch of the charging pile, the nominal cross-sectional area of ​​the charging cable, and the service life of the line.

[0060] Specifically, when the target node is the inlet node, firstly, during the initial power-on initialization or parameter change of the safety control system, the central processing unit can read the user-pre-configured inlet switch rated current In (unit: A), charging cable nominal cross-sectional area S (unit: mm²), and line service life t_age (unit: years).

[0061] Then, based on the nominal cross-sectional area S of the charging cable, the safe current carrying capacity of the charging cable can be obtained from the cable specification mapping table using a lookup table method. For example, the safe current carrying capacity of charging cables can be obtained by referring to the GB / T16895.15 standard "Electrical Installations in Buildings". Additionally, due to safe carrying capacity... The safe current carrying capacity is also affected by the line's service life (t_age). Therefore, in this application, an aging factor η_age (which decreases with t_age and is taken as 0.9~0.95 / 10 years) can be used to determine the safe current carrying capacity. The conversion will be carried out.

[0062] Next, the total safe power threshold can be obtained based on the preset power threshold calculation formula, the safe current carrying capacity, the rated current of the incoming switch, and the service life of the line. In this application, the preset power threshold calculation formula can be expressed as the following formula (1): (1) in, The total safe power threshold is defined by U_n, which is the rated voltage (single-phase 230V / three-phase 400V) and K_safe, which is the safety factor (0.8~0.9). This is a function that takes the minimum value.

[0063] Finally, the safe total power threshold can be set. Write the value to non-volatile memory (EEPROM / Flash) as a reference value for subsequent steps.

[0064] Step 302: Collect data from the charging circuit of the charging pile in real time to obtain the total power consumption of the charging circuit and the temperature of the charging cable.

[0065] Specifically, in this application, taking the in-home node as an example, the charging circuit is the in-home circuit, and the real-time acquisition of the total power consumption of the in-home circuit and the real-time acquisition of the charging cable temperature are performed in parallel.

[0066] During normal operation of the safety control system, the real-time acquisition of the total power consumption of the incoming circuit can be achieved by continuously executing the following process: First, the in-home load acquisition module continuously acquires the instantaneous current of the in-home circuit at a fixed sampling period of Ts=100ms to obtain multiple instantaneous currents i(t).

[0067] Then, the central processing unit can use a sliding window algorithm to process the multiple instantaneous currents i(t) (e.g., perform root mean square processing) to obtain the effective value current I_rms.

[0068] Next, the total power consumption of the incoming circuit can be obtained according to the preset total power consumption calculation formula and the effective current. In this application, the preset total power consumption calculation formula can be expressed by the following formula (2): (2) in, This represents the total power consumption of the incoming circuit. For power factor. In this application, for single-phase electricity, it can be directly obtained through... To obtain the total power consumption of the incoming circuit. For three-phase electricity, the total power consumption of the incoming circuit can be obtained by directly adding the power calculated for each of the three phase lines. .

[0069] Finally, the raw data (e.g., multiple instantaneous currents) and the calculated results (e.g., RMS current, total power consumption of the incoming circuit) can be stored in a ring buffer, retaining historical data from the most recent 10 seconds for trend analysis.

[0070] Meanwhile, the real-time acquisition of charging cable temperature can be achieved by continuously executing the following process: First, each NTC thermistor temperature sensor continuously collects the cable temperature of the incoming circuit at a sampling period of Tt=500ms, obtaining multiple raw temperature values ​​T_i(t).

[0071] Then, the central processing unit will take the maximum value among the multiple original temperature values ​​T_i(t) as the charging cable temperature T(t).

[0072] Finally, the temperature change rate dT / dt (temperature difference per second) can be calculated based on the multiple original temperature values ​​to help determine whether there is a sudden abnormality (such as a rapid temperature rise caused by poor contact).

[0073] In this application, to facilitate subsequent dual safety assessments, the following three temperature thresholds can also be set: Normal upper limit temperature threshold: T_normal, for example, can be set to 50℃; Warning temperature threshold: T_warning, for example, can be set to 55℃; Critical temperature threshold: T_critical, for example, can be set to 70℃.

[0074] Among them, T_critical should be lower than the maximum allowable operating temperature of the cable insulation material.

[0075] Step 303: Obtain the remaining available power based on the safe total power threshold and the total power consumption of the charging circuit.

[0076] Specifically, taking the in-home node as an example, the charging circuit is an in-home circuit, and the charging pile is a private charging pile. Based on this, after each completion... After updating the data T(t), the central processing unit can execute the following process: First, a preset formula for calculating remaining available power and a safe total power threshold can be used. Total power consumption of the incoming circuit Determine the remaining available power In this application, the formula for calculating the remaining available power can be expressed as the following formula (3): (3) in, This represents the remaining available power.

[0077] Then, it can be determined whether the remaining available power is negative.

[0078] Next, if it is determined that the remaining available power is negative, then the remaining available power is set to zero.

[0079] Conversely, if it is determined that the remaining available power is not negative, the current actual output power P_current of the private charging pile can be obtained through feedback from the power regulation module or by reading from the CAN bus.

[0080] Finally, the power margin can be obtained based on the preset power margin calculation formula, the remaining available power, and the current actual output power. In this application, the preset power margin calculation formula can be expressed as the following formula (4): (4) When the power margin is positive, it means that the power needs to be reduced, while when the power margin is negative or zero, it means that there is spare capacity.

[0081] Step 304: Determine the target control strategy based on the remaining available power and the temperature of the charging cable.

[0082] where the target control strategy is a normal charging strategy, a power reduction strategy, a charging suspension strategy, or a charging cutoff strategy.

[0083] Specifically, taking the household entry node as an example, the charging loop is a household entry loop, as shown in Figure 4 , which is a schematic flowchart for determining a target control strategy provided by the embodiments of the present application. First, it may be determined whether an abnormality exists in the household entry loop; where the abnormality includes a sudden current change or a sharp temperature rise; for example, if a detected current sudden change amount has a duration not exceeding 2 sampling periods, or a temperature change rate or other preset abnormality modes, it may be considered that an abnormality exists in the household entry loop.

[0084] Based on this, if it is determined that an abnormality exists in the household entry loop, the target control strategy is determined to be the charging cutoff strategy, that is, the central processing unit will bypass the conventional hierarchical response logic, directly trigger a hardware-level emergency cutoff, turn off all PWM drive signals of the power regulation module of the charging pile, and physically cut off the charging output path; at the same time, the system state is locked to prohibit automatic recovery until manual intervention for inspection and manual reset; in addition, a complete fault snapshot (for example, the total P curve, T curve, control instruction sequence, etc. before and after the fault) can be written into the non-volatile memory and synchronized to the operation and maintenance background through the cloud early warning platform; in addition, if a local fault indicator light is present, the local fault indicator light can also be lit, and a clear fault code and handling guidelines can be displayed on the user terminal interface.

[0085] Conversely, if it is determined that no abnormality exists in the household entry loop, the target control strategy may be further determined according to the remaining available power and the temperature of the charging cable.

[0086] Further, when determining the target control strategy according to the remaining available power and the temperature of the charging cable, as shown in Figure 4 , first, it may be determined whether the system is currently in a "normal" state, that is, it may be determined whether the remaining available power is less than the current actual output power, and whether the temperature of the charging cable is less than the early warning temperature threshold.

[0087] Then, if it is determined that the remaining available power is not less than the current actual output power, and the temperature of the charging cable is less than the early warning temperature threshold, the target control strategy is determined to be the normal charging strategy; that is, ≥P_current and T(t)<T_warning, the central processing unit will determine that the system is currently in a "normal" state, and then execute the normal charging strategy to maintain the current output power of the private charging pile unchanged.

[0088] In this application, after determining that the target control strategy is the normal charging strategy, if the power margin is greater than a margin threshold (for example, the power margin exceeds 2 kW), that is, is significantly greater than P_current, the charging power can be appropriately increased on the premise of not exceeding the requested power, so as to improve the charging efficiency. In addition, no warning or alarm information is generated in this state.

[0089] Conversely, if it is determined that the remaining available power is less than the current actual output power, or the temperature of the charging cable is not less than the warning temperature threshold, that is, when it is determined that the system is not currently in the "normal" state, it is further determined whether the system needs to perform a "power reduction response", as Figure 4 shown, specifically, it is necessary to determine whether the remaining available power is less than the current actual output power, or whether the temperature of the charging cable is between the warning temperature threshold and the critical temperature threshold.

[0090] Next, if it is determined that the remaining available power is less than the current actual output power, or the temperature of the charging cable is between the warning temperature threshold and the critical temperature threshold, the target control strategy is determined as a power reduction strategy; that is, <P_current or T_warning≤T(t)<T_critical, the central processing unit will determine that the system currently needs to perform a "power reduction response".

[0091] In this application, in order to further improve the robustness of the system and enhance user experience, when the target control strategy is determined as the power reduction strategy, a "progressive power response" can also be performed. Specifically, if it is determined that the power margin is less than the preset power threshold, the target control strategy is determined as a low-level power reduction strategy; that is, if it is a slight over-limit (ΔP<ΔP_th1, for example, the preset threshold ΔP_th1=1kW), the actual output power can be reduced by a small margin of 1~2kW; conversely, if it is determined that the power margin is not less than the preset power threshold, the target control strategy is determined as a medium-level power reduction strategy. That is, if it is a medium over-limit or the temperature is close to the warning value, the output power is reduced to ×K_derate, where the predetermined power reduction coefficient K_derate is 0.85~0.9.

[0092] In addition, a new target power command Pcmd can be sent to the charging pile power regulation module, so that the charging pile power regulation module completes the transition within 200ms; at the same time, the power reduction event (including the trigger reason, the power values before and after, and the timestamp) can also be recorded for subsequent statistical analysis and user notification.

[0093] Then, after completing the "power reduction response", or when the temperature of the charging cable is too high, as Figure 4 shown, it can also be determined whether the system needs to "suspend charging". Specifically, it is necessary to determine whether the remaining available power is less than the reduced actual output power, or whether the temperature of the charging cable is less than the critical temperature threshold.

[0094] Next, if it is determined that the remaining available power is less than the reduced actual output power, or the charging cable temperature is not less than the critical temperature threshold, then the target control strategy is determined to be a pause charging strategy. That is, when the reduced actual output power P_total > Pmax, or T(t) ≥ T_critical (or dT / dt exceeds the preset rate threshold, for example, 5℃ / s), the central processing unit will determine that the system needs to pause charging. Based on this, the output power of the charging pile can be immediately set to zero (Pcmd=0), and the supply of electrical energy to the electric vehicle can be stopped.

[0095] Step 305: Perform dynamic safety control on the charging circuit load according to the target control strategy.

[0096] In this application, if the target control strategy is determined to be a pause charging strategy, then after performing dynamic safety control on the charging circuit load (pausing charging of the charging circuit) according to the target control strategy, an "early warning can also be sent".

[0097] Specifically, taking the in-home node as an example, the charging circuit is an in-home circuit. First, it can send an emergency event report to the cloud-based early warning platform through the communication module. The emergency event report includes the current event type, the total power consumption of the in-home circuit, the temperature of the charging cable, and the event timestamp.

[0098] Then, the cloud-based early warning platform can be used to push early warning messages to the terminal devices of the charging pile owner and the current charging users in real time; wherein, the early warning message is used to inform the reason for the suspension and the expected resumption conditions.

[0099] Finally, it can enter a pause standby state to continuously monitor the total power consumption of the incoming circuit. The temperature of the charging cable, T(t), is monitored while waiting for safe conditions to be restored.

[0100] In one possible implementation, if the target control strategy is a pause charging strategy, then after the charging circuit load is dynamically and safely controlled (charging the charging circuit is paused) according to the target control strategy, charging can be "automatically resumed".

[0101] Specifically, taking the in-home node as an example, the charging circuit is an in-home circuit. In the pause standby state, firstly, it can be determined whether the remaining available power is less than the preset minimum recovery power, and whether the charging cable temperature is less than the normal upper limit temperature threshold.

[0102] Then, if it is determined that the remaining available power is not less than the preset minimum recovery power, and the charging cable temperature is less than the normal upper limit temperature threshold, then it is determined whether the actual output power obtained from N consecutive samplings is within the preset safety range; where N is a positive integer; that is, If the minimum recovery power is ≥P_min_resume (e.g., 3kW) and T(t) < T_normal, and remains stable for at least t_stable seconds (e.g., 30 seconds), then the central processing unit continues to verify the continuity of the safety conditions. That is, it determines whether the actual output power obtained by sampling N times (e.g., N=10 times, corresponding to 1 second) is within the preset safety range to prevent false recovery caused by instantaneous fluctuations.

[0103] Next, if it is determined that the actual output power obtained from N consecutive samplings is within the preset safety range, the actual output power of the private charging pile can be gradually increased according to the preset power recovery slope (instead of restoring it to full power all at once) to avoid the impact of step shock on the power grid.

[0104] In addition, after the automatic recovery charging is completed, the process can be switched back to the normal cycle monitoring process in step 302; furthermore, the entire automatic recovery charging process is fully automated and requires no human intervention. Specific implementation examples: Mr. Zhang, a resident of an underground parking garage in a residential community, installed a 7kW AC private charging pile in his own parking space and opened it to his relatives and neighbors in the community through a sharing platform. Mr. Zhang's inlet switch has a rated current of 60A (equivalent to about 13.8kW@230V), and the inlet charging cable is made of BV-3×6mm² copper core wire with a service life of about 5 years.

[0106] Therefore, the specific process of dynamic safety control of the inbound circuit load applied to this private charging pile sharing scenario is as follows: Phase 1: Safety control system initialization and threshold setting.

[0107] First, after the safety control system is powered on, the MCU reads the preset parameters: In=60A, S=6mm², t_age=5 years.

[0108] Then, by consulting the GB standard, the safe current carrying capacity of a 6mm² copper core wire is approximately 36A. Considering 5 years of aging, η_age = 0.95, the calculated Isafe = 36A × 0.95 = 34.2A.

[0109] Next, calculate min(34.2×0.95×230, 60×230×0.85) = min(7464W, 11730W), take the smaller value and leave a margin, to obtain =11kW.

[0110] Then, the safety control system enters its normal operation cycle and begins to collect the total power consumption of the incoming circuit at 100ms intervals. The temperature T(t) of the charging cable is collected at a period of 500ms.

[0111] Phase Two: The dynamic adjustment process of daily operation.

[0112] For example, at 6:30 PM, a household is using an air conditioner (1.5 horsepower, approximately 1.2 kW), an induction cooker (2 kW), lighting, and other appliances (approximately 0.8 kW). The whitelisted user, Mr. Li, arrived and started charging. The private charging station operated at full power of 7kW, with a total load of approximately 11kW, close to but not exceeding 4kW. (11kW) The safety control system determines that the status is normal, so "normal charging" is sufficient.

[0113] At 7:00 PM, Zhang's family turned on the storage-type electric water heater (2kW heating setting) again. The power output jumped to approximately 6kW, and the safety control system detected the remaining available power. =11-6=5kW<current actual output power 7kW, and ΔP=7-5=2kW≥ΔP_th1, therefore, the "medium power reduction strategy" is triggered.

[0114] The MCU calculates the target power Pcmd= ×0.9=5kW×0.9=4.5kW. A power reduction command is sent to the charging pile's power adjustment module, thus smoothly transitioning the private charging pile's output from 7kW to 4.5kW, keeping the total load at approximately 10.5kW, which is lower than... The safety line is in place, and the temperature T(t) of the charging cable rises to 52℃, which has not yet reached the warning temperature threshold.

[0115] At 19:15 in the evening, the electric water heater automatically switched to heat preservation mode after heating was completed (power consumption dropped to about 0.1kW). The power output dropped to approximately 4.1kW, which was detected by the safety control system. =11-4.1=6.9kW>The current actual output power is 4.5kW, and T(t) is stable at 51℃, meeting the conditions for "automatic charging recovery". After 30 seconds of stability verification, the safety control system gradually increases the charging power back to 6kW (subject to...). The limit cannot be fully returned to 7kW.

[0116] Phase Three: High Temperature Warnings and Extreme Protection

[0117] The following day, during the hot summer weather, the ambient temperature in the underground parking garage reached 38℃. At noon, a user was charging at 7kW. At this time, the household air conditioners were running at full power (two units totaling approximately 3.5kW), plus other loads of approximately 2kW. The total load is approximately 12.5kW, slightly exceeding Pmax. The safety control system has already implemented a power reduction operation, and the charging pile is now operating at around 5kW.

[0118] However, due to the high ambient temperature and the long-term full-load operation of the cable, the NTC thermistor temperature sensor measured the surface temperature T(t) of the charging cable to continue to rise, reaching 56℃ at 12:15, which exceeded the T_warning (55℃) threshold. Although the safety control system still had a power margin, it triggered the temperature warning condition and needed to reduce the charging power to 3kW again, and push the high temperature warning notification to both users.

[0119] At 12:30 the next day, Zhang's family temporarily turned on the instant hot water dispenser (2.2kW). The power suddenly increased to about 7.7kW, and T(t) had risen to 59℃. The safety control system determined that both the power over-limit and temperature over-limit conditions were triggered at the same time. Therefore, it was necessary to immediately execute the "pause charging" step to set the charging pile output to zero, stop charging, and send a warning message to both the pile owner, Mr. Zhang, and the charging user that "the inbound load is too high and the cable temperature is too high. Charging has been automatically paused."

[0120] Based on this, after receiving the warning message, Zhang checked the details through the app, turned off the water dispenser, and 5 minutes later... The power dropped to 5.5kW, and T(t) also slowly decreased to 52℃. After about 1 minute of temperature stabilization, the safety control system automatically executed the "automatic resumption of charging" step, restoring the charging power to about 5kW in a ramp manner. The user did not need to do anything during the entire process.

[0121] Phase 4: Emergency shutdown in abnormal situations.

[0122] During a charging process on a certain day, the safety control system suddenly detected that the current dropped from 28A to 5A within 100ms and then surged to 45A (Δi / i>60%). At the same time, dT / dt reached 12℃ / s, which is significantly beyond the normal range.

[0123] The safety control system will immediately trigger the highest priority protection, "cut off charging," to directly shut down the PWM drive, cut off the charging output, lock the system state, and prohibit any automatic recovery attempts.

[0124] Then, a complete fault snapshot is saved. This fault snapshot is used in post-incident analysis to find that the cause was increased contact resistance due to long-term plugging and unplugging of the charging gun head, which caused arcing discharge when a large current passed through. This emergency cut-off prevented a possible burn-out accident.

[0125] Next, after receiving the fault notification, Mr. Zhang contacted the maintenance personnel to replace the charging gun. After manual inspection and confirmation that there was no problem, he pressed the reset button on site, and the safety control system returned to normal operation.

[0126] In summary, this application has the following advantages: (1) Dynamically adapts to the load-bearing capacity of the inlet circuit, completely eliminating the drawbacks of the fixed power mode. The total power of the inlet circuit is collected in real-time at a high frequency of 100ms. Accurately calculate the remaining available power at every moment. Based on this, the output of the charging pile is dynamically adjusted. Compared with the traditional fixed power solution, this method can improve the charging efficiency by 20% to 40% (depending on the fluctuation of household load), while ensuring that the safe load limit of the inlet line is never exceeded at any time.

[0127] (2) A three-dimensional safety protection network is constructed through dual monitoring of "remaining available power + charging cable temperature". The innovative introduction of cable temperature monitoring creates a dual-variable joint criterion of "remaining available power + charging cable temperature". Simply relying on current / power monitoring cannot detect localized overheating problems caused by poor contact, insulation aging, etc.; however, with the addition of charging cable temperature monitoring, even if the total power of the incoming circuit is... Even under seemingly normal circumstances, hidden thermal hazards can be detected and addressed in a timely manner, reducing the risk of electrical fires by an order of magnitude.

[0128] (3) The "four-level progressive response" balances safety and continuity of use. Unlike the binary logic of "normal / trip" in the prior art, this application designs a four-level progressive response strategy of "normal charging → reduced power operation → pause standby → emergency cut-off". In most cases, only a small power reduction is needed to mitigate the risk and will not completely interrupt the charging process, which significantly improves the charging experience of shared users. According to calculations, after adopting the four-level progressive response strategy of this application, the number of charging interruptions caused by safety protection can be reduced by more than 70%.

[0129] (4) Zero human intervention is achieved through the “fully automatic recovery mechanism”. When the safety conditions are met again, the safety control system can autonomously complete the entire recovery process from the paused state to normal charging, including all aspects such as safety verification, power ramp-up, and cycle monitoring. This is especially important for shared scenarios because users who are not the owners of the charging pile usually do not have the operating authority and technical knowledge. Automatic recovery eliminates the dilemma of “no one can reset after protection is triggered”.

[0130] (5) It can be adapted to old communities without modifying the original circuit. The software-level intelligent control makes up for the hardware shortcomings of insufficient capacity of the inlet line in old communities. There is no need to replace the inlet switch, re-lay the cable, or upgrade the power distribution capacity. Only by adding a safety control system can the safe and compliant operation of private pile sharing be realized. The transformation cost is low, the construction period is short, and the feasibility of promotion is high.

[0131] (6) Fire accidents can be effectively prevented through “real-time early warning of abnormal status”. Through the instant push mechanism of the cloud platform, the charging pile owner and charging user can be informed of safety hazards and take corresponding measures at the first time. Combined with the emergency cut-off function and the complete fault record function, a closed-loop safety management system of prevention-protection-alarm-traceability is formed, which can reduce the risk of electrical fire accidents related to charging to an extremely low level.

[0132] In some possible implementations, this application also provides a charging system, such as Figure 5 The diagram shown is a schematic representation of a charging system provided in an embodiment of this application. The charging system includes at least two power modules 110, a controller 130, a power distribution device 140, and at least one charging interface 120. The power distribution device 140 is connected to the controller 130, each power module 110, and each charging interface 120.

[0133] The power module 110 is used to convert the AC power from the power grid into DC power and supply it to the charging interface 120. The controller 130 is used to obtain the power demand of each charging interface 120 and generate a scheduling command according to the connection relationship of the controllable switch in the power distribution device 140 and the power demand. The power distribution device 140 is used to control the opening or closing of the controllable switch according to the scheduling command so as to distribute the output power of each power module 110 to each charging interface 120.

[0134] In one optional implementation, the charging system provided in this application is an integrated DC charging pile, with the charging interface 120 used to connect the charging gun, and the charging gun connected to the host of the charging system via the charging gun socket on the main body of the charging system.

[0135] In one possible implementation, the charging system provided in this application is a split-type DC charging pile. The charging system also includes multiple charging terminals. The charging interface 120 is used to connect the charging terminals. The charging terminals are set separately from the main body of the charging system. The charging terminals are equipped with a single charging gun or dual charging guns for outputting power to electric vehicles.

[0136] In some possible implementations, various aspects of the methods provided in this application can also be implemented as a program product comprising program code that, when run on a computer device, causes the computer device to perform the steps of the methods according to the various exemplary embodiments of this application described above. For example, the computer device may perform actions such as... Figures 3-4 The method in the illustrated embodiment.

[0137] Those skilled in the art will understand that all or part of the steps of the above method embodiments can be implemented by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it performs the steps of the above method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks. Alternatively, if the integrated units of this application are implemented as software functional modules and sold or used as independent products, they can also be stored in a computer-readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, or the parts that contribute to the prior art, can be embodied in the form of software products. These computer software products are stored in a storage medium and include several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as mobile storage devices, ROM, RAM, magnetic disks, or optical disks.

[0138] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0139] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for dynamic safety control of charging load, characterized in that, The method includes: The total safe power threshold is determined based on the electrical parameters of the target node; wherein, the electrical parameters of the target node include the rated current of the target node switch of the charging pile, the nominal cross-sectional area of ​​the charging cable, and the service life of the line; Real-time data collection of the charging circuit of the charging pile to obtain the total power consumption of the charging circuit and the temperature of the charging cable; The remaining available power is obtained based on the safe total power threshold and the total power consumption of the charging circuit; The target control strategy is determined based on the remaining available power and the temperature of the charging cable; wherein the target control strategy is a normal charging strategy, a power reduction strategy, a pause charging strategy, or a disconnect charging strategy. Based on the target control strategy, dynamic safety control is performed on the charging circuit load.

2. The method as described in claim 1, characterized in that, The target node is an in-home node. The step of determining the safe total power threshold based on the electrical parameters of the target node includes: During initial power-on initialization or parameter changes, the system reads the user-pre-configured rated current of the inlet switch, the nominal cross-sectional area of ​​the charging cable, and the years of service of the line. Based on the nominal cross-sectional area of ​​the charging cable, obtain the safe current carrying capacity of the charging cable from the cable specification mapping table; The safe total power threshold is obtained based on the preset power threshold calculation formula, safe current carrying capacity, rated current of the incoming switch, and the service life of the line.

3. The method as described in claim 1, characterized in that, The target node is an in-home node, and the charging circuit is an in-home circuit. The step of real-time data acquisition of the charging circuit of the charging pile to obtain the total power consumption of the charging circuit and the temperature of the charging cable includes: The instantaneous current of the incoming circuit is continuously collected to obtain multiple instantaneous currents; The sliding window algorithm is used to process the multiple instantaneous currents to obtain the effective value current. The total power consumption of the incoming circuit is obtained based on the preset total power consumption calculation formula and the effective current. The temperature of the cable in the inlet circuit is continuously collected to obtain multiple raw temperature values; The maximum value among the multiple original temperature values ​​is taken as the charging cable temperature.

4. The method as described in claim 1, characterized in that, The target node is an in-home node, the charging circuit is an in-home circuit, and the charging pile is a private charging pile. The step of obtaining the remaining available power based on the safe total power threshold and the total power consumption of the charging circuit includes: The remaining available power is determined by using a preset formula for calculating the remaining available power, a safe total power threshold, and the total power consumption of the incoming circuit; Determine if the remaining available power is negative; If the remaining available power is determined to be negative, then the remaining available power is set to zero; If it is determined that the remaining available power is not negative, then obtain the current actual output power of the private charging pile; The power margin is obtained based on the preset power margin calculation formula, the remaining available power, and the current actual output power.

5. The method as described in claim 1, characterized in that, The target node is the in-home node, and the charging circuit is the in-home circuit. The step of determining the target control strategy based on the remaining available power and the charging cable temperature includes: Determine if there is any abnormality in the incoming circuit; wherein, the abnormality includes sudden current changes or a sudden temperature rise; If an anomaly is determined in the inlet circuit, the target control strategy is to cut off the charging. If it is determined that there is no abnormality in the inlet circuit, the target control strategy is determined based on the remaining available power and the temperature of the charging cable.

6. The method as described in claim 5, characterized in that, The step of determining the target control strategy based on the remaining available power and the charging cable temperature includes: If it is determined that the remaining available power is not less than the current actual output power, and the charging cable temperature is less than the warning temperature threshold, then the target control strategy is determined to be the normal charging strategy. If it is determined that the remaining available power is less than the current actual output power, or the charging cable temperature is between the warning temperature threshold and the critical temperature threshold, then the target control strategy is determined to be a power reduction strategy. If it is determined that the remaining available power is less than the reduced actual output power, or the charging cable temperature is not less than the critical temperature threshold, then the target control strategy is determined to be the pause charging strategy.

7. The method as described in claim 6, characterized in that, The step of determining the target control strategy as a power reduction strategy includes: If the power margin is determined to be less than the preset power threshold, the target control strategy is determined to be a low-power reduction strategy; wherein, the power margin is determined by the remaining available power and the current actual output power. If the power margin is determined to be no less than the preset power threshold, then the target control strategy is determined to be a medium power reduction strategy.

8. The method as described in claim 1, characterized in that, The target control strategy is a pause charging strategy. After performing dynamic safety control on the charging circuit load according to the target control strategy, the method further includes: Send an emergency event report to the cloud-based early warning platform; wherein the emergency event report includes the current event type, total power consumption of the inbound circuit, charging cable temperature and event timestamp; The cloud-based early warning platform is used to push early warning messages to the terminal devices of the charging pile owner and the terminal devices of the current charging users; wherein, the early warning message is used to inform the reason for the suspension and the expected resumption conditions.

9. The method as described in claim 1, characterized in that, The target control strategy is a charging pause strategy, the charging pile is a private charging pile, and after performing dynamic safety control on the charging circuit load according to the target control strategy, the method further includes: If it is determined that the remaining available power is not less than the preset minimum recovery power and the charging cable temperature is less than the normal upper limit temperature threshold, then it is determined whether the actual output power obtained from N consecutive samplings is within the preset safety range; where N is a positive integer. If it is determined that the actual output power obtained from N consecutive samplings is within the preset safety range, then the actual output power of the private charging pile will be gradually increased according to the preset power recovery slope.

10. A charging system, characterized in that, Includes a controller for performing the dynamic safety control method for charging load as described in any one of claims 1-9.

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