Emergency power supply method and system for cable branch box

Abstract

The invention belongs to the technical field of intelligent power grids, and particularly relates to an emergency power supply method and system for a cable branch box, and the method comprises the steps: obtaining a breaking instruction result of a circuit breaker, enabling a main power supply loop to continue to supply power if the breaking instruction result is keeping, and enabling an incoming circuit breaker to execute a breaking operation and switch an emergency power supply loop if the breaking instruction result is triggering; when the emergency power supply loop supplies power, the emergency power supply voltage is dynamically adjusted based on the environment self-adaptive charging function, and the corrected charging voltage is obtained; under the condition that the breaking instruction result is keeping, a power supply switching instruction is obtained, and if the power supply switching instruction is switching, an emergency power supply loop is switched; monitoring the power supply state, determining the current of each branch of the main power supply loop or the emergency power supply loop, predicting the fault probability of power supply equipment, and determining a communication protocol based on the communication state; and under the power supply state of the emergency power supply loop, determining the load power supply priority. The performance and the reliability of the cable branch box emergency power supply system are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of smart grids, and specifically relates to an emergency power supply method and system for cable distribution boxes. Background Art

[0002] Smart grid technology integrates cutting-edge technologies such as the Internet of Things, artificial intelligence, energy storage, and power electronics, aiming to build an efficient power distribution system with autonomous decision-making capabilities. Currently, as a key to ensuring the reliability of the power distribution network, the emergency power supply system for cable distribution boxes has initially achieved the functions of real-time monitoring and fault early warning for cable tapping nodes. Through integrated intelligent monitoring and multi-mode communication technologies, when the power grid is subjected to sudden interferences such as lightning strikes and short circuits, the AI algorithm is used to judge the fault level, and the solid-state relay and mechanical switch composite switching device are used to quickly isolate the fault area and start the energy storage battery pack for power supply to ensure the continuous operation of important loads.

[0003] However, the existing emergency power supply technology for cable distribution boxes has obvious deficiencies: the level of intelligence is limited, making it difficult to accurately respond to complex working conditions; the collaborative control mechanism is imperfect, and the cooperation between each functional module is not close enough; the environmental adaptability is poor, and it is unable to flexibly adjust the power supply strategy according to environmental changes. This results in the existing technology being difficult to meet the reliable power supply requirements under complex working conditions. Summary of the Invention

[0004] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an emergency power supply method and system for cable distribution boxes, which significantly improves the performance and reliability of the emergency power supply system for cable distribution boxes through technological innovations in aspects such as intelligent control, environmental adaptive adjustment, collaborative working mechanism, and reliable communication guarantee.

[0005] To achieve the above purpose, the present invention is realized through the following technical solutions: An emergency power supply method for a cable distribution box, including: Obtain the result of the breaker tripping instruction. If the tripping instruction result is to maintain, the main power supply circuit continues to supply power. If the tripping instruction result is to trigger, the incoming line breaker performs a disconnecting operation to switch the emergency power supply circuit; When the emergency power supply circuit is supplying power, dynamically adjust the emergency power supply voltage based on the environmental adaptive charging function to obtain the corrected charging voltage; In the case where the tripping instruction result is to maintain, obtain the power supply switching instruction. If the power supply switching instruction is to switch, switch the emergency power supply circuit. If the power supply switching instruction is to maintain, the main power supply circuit continues to supply power; Monitor the power supply status and determine the current of each branch of the main power supply circuit or the emergency power supply circuit, predict the failure probability of the power supply equipment, and determine the communication protocol based on the communication status; Determine the load power supply priority when the emergency power supply circuit is in the power supply state.

[0006] Preferably, the method for obtaining the disconnection instruction result is as follows: Obtain the effective value of the current, the voltage phase angle, and the output value of the short-circuit detector signal; Receive the effective value of the current, the voltage phase angle, and the output value of the short-circuit detector signal through the microprocessor and run the piecewise function to obtain the disconnection instruction result. The piecewise function is: ; Where: is the disconnection instruction result of the circuit breaker, is the effective value of the current, is the rated current of the circuit breaker, is the voltage phase angle, is the output value of the short-circuit detector signal output by the short-circuit detector.

[0007] Preferably, the emergency power supply voltage is dynamically adjusted based on the environment-adaptive charging function to obtain the corrected charging voltage. The process is as follows: Obtain the power supply data of the emergency power supply circuit, including the battery temperature, the humidity sensor value, and the initial charging voltage value; Based on the battery management system, analyze to obtain the SOH compensation coefficient; Run the environment-adaptive charging function and combine the SOH compensation coefficient to obtain the corrected charging voltage: ; Where: is the corrected charging voltage, is the initial charging voltage value, is the temperature-related adjustment coefficient, is the humidity-related adjustment coefficient, is the battery temperature, is the humidity sensor value, is the SOH compensation coefficient.

[0008] Preferably, analyzing to obtain the SOH compensation coefficient includes the following steps: Based on the battery management system, obtain the battery internal resistance, the remaining capacity, and the charge and discharge cycle times in real time; Run the SOH evaluation function: ; Where: is the remaining capacity, is the rated capacity, is the charge and discharge cycle times, is the battery internal resistance, is the initial internal resistance; The calculation formula for the SOH compensation coefficient is: ; Based on the calculated SOH, if the SOH is less than 0.8, perform a charging voltage adjustment operation to increase the charging voltage; if the SOH is not less than 0.8, no adjustment is made.

[0009] Preferably, when the result of the disconnection instruction is to hold, obtain a power supply switching instruction, including the following steps: Obtain the main power supply loop data, including the main power supply voltage, the current energy storage battery power, the analog signal value of the lightning strike sensor, and the rated power of the energy storage battery; Run the sudden power failure switching function to obtain a power supply switching instruction: ; Where: is the output switching instruction, is the main power supply voltage, is the main power supply voltage threshold, is the lightning strike signal trigger threshold, is the analog signal value of the lightning strike sensor, is the current energy storage battery power, is the rated power of the energy storage battery.

[0010] Preferably, monitor the power supply status and determine the current of each branch of the main power supply loop or the emergency power supply loop. The process is as follows: Obtain the maximum output current of the battery, the external interference score, and the active power of each branch; Run the branch current compensation distribution formula to obtain the current of each branch: ; Where: is the branch current of the i-th branch, is the active power of the i-th branch, Interfere is the external interference score, is the maximum output current of the battery, i is the number of the target load branch, and n is the total number of branches.

[0011] Preferably, obtain the external interference score, including the following steps: Based on the electromagnetic compatibility tester, obtain the electromagnetic radiation intensity of each frequency band and analyze to obtain the electromagnetic interference score corresponding to the electromagnetic interference level; Based on the voltage monitor and current monitor, obtain the voltage fluctuation amplitude and frequency fluctuation, and analyze to obtain the power supply fluctuation score corresponding to the power supply fluctuation level; Based on the temperature and humidity sensor, obtain the temperature change amplitude and humidity change amplitude, and analyze to obtain the environmental interference score corresponding to the environmental interference level; The obtained electromagnetic interference score, power supply fluctuation score, and environmental interference score are weighted and summed to obtain the external interference score.

[0012] Preferably, the communication protocol is determined based on the communication state, and the process is as follows: Obtain the communication state data of each candidate communication protocol, including the received signal strength, external electromagnetic interference strength, and signal attenuation amount; Process the communication state data of each candidate communication protocol based on the communication protocol comprehensive score function to obtain the highest communication protocol comprehensive score: ; where: Pro is the highest communication protocol comprehensive score, p is the number of the communication protocol, is the received signal strength of the p-th communication protocol, is the external electromagnetic interference strength received by the p-th communication protocol, is the signal attenuation amount of the p-th communication protocol; Determine the candidate communication protocol corresponding to the highest communication protocol comprehensive score and use it as the finally determined communication protocol.

[0013] Preferably, in the power supply state of the emergency power supply circuit, the load power supply priority is determined, and the process is as follows: Obtain the interference type of the external interference signal; Retrieve the interference type - priority adjustment coefficient mapping table stored in the database; Based on the determined interference type of the external interference signal, obtain the priority adjustment coefficient, and run the priority adjustment rule model to obtain the load power supply priority: ; where: is the current priority, is the original priority, is the priority adjustment coefficient corresponding to the interference type.

[0014] A cable branch box emergency power supply system for implementing the above method, including: The main power supply module obtains the breaker trip instruction result. If the trip instruction result is to maintain, the main power supply circuit continues to supply power. If the trip instruction result is to trigger, the incoming line breaker performs a disconnect operation to switch to the emergency power supply circuit; The emergency power supply module dynamically adjusts the emergency power supply voltage based on the environment adaptive charging function during the power supply of the emergency power supply circuit to obtain the corrected charging voltage; The intelligent switching module obtains the power supply switching instruction when the trip instruction result is to maintain. If the power supply switching instruction is to switch, the emergency power supply circuit is switched. If the power supply switching instruction is to maintain, the main power supply circuit continues to supply power; The monitoring module monitors the power supply status, determines the current of each branch in the main power supply circuit or the emergency power supply circuit, predicts the failure probability of the power supply equipment, and determines the communication protocol based on the communication status; The load management module determines the load power supply priority under the power supply status of the emergency power supply circuit.

[0015] The present invention has the following beneficial effects: High level of intelligence: The present invention adopts a multi-parameter fusion breaking algorithm. By obtaining multi-dimensional data such as the effective current value, voltage phase angle, and short-circuit detector signal, it accurately judges the circuit state, avoids misoperation, and improves the fault diagnosis ability of the system under complex working conditions.

[0016] Strong environmental adaptability: The present invention introduces an environment-adaptive charging strategy, dynamically adjusts the charging voltage according to the battery temperature, humidity, and battery health state (SOH), ensures that the battery can operate efficiently and stably under different environmental conditions, effectively extends the battery life, and reduces the risks of battery aging and power supply interruption caused by environmental changes.

[0017] Improved cooperative control mechanism: The modules of the present invention cooperate closely with each other. The main power supply module, emergency power supply module, intelligent switching module, monitoring module, and load management module cooperate with each other to realize the full-process intelligent control from fault detection, power supply switching to load management, ensuring that the system can respond quickly and operate stably in case of sudden faults.

[0018] High communication reliability: The present invention supports multi-protocol adaptive switching. By comprehensively evaluating factors such as the received signal strength, electromagnetic interference strength, and signal attenuation amount, it automatically selects the optimal communication protocol to ensure the stability and reliability of data transmission, and can realize effective communication between modules even in a complex electromagnetic environment.

[0019] Optimized load management: The present invention optimizes the load distribution in real time according to the type of external interference through the interference compensation distribution algorithm and dynamic priority adjustment mechanism, gives priority to ensuring the power supply quality of key loads, and realizes the reasonable allocation and efficient utilization of power resources under the limited capacity of the emergency power supply, improving the accuracy and effectiveness of emergency power supply. Description of the Drawings

[0020] Figure 1 It is a flow schematic diagram of the method of the present invention; Figure 2 It is a module schematic diagram of the system of the present invention. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention.

[0022] Embodiment 1: AsFigure 1 As shown in the figure, an emergency power supply method for a cable branch box includes: obtaining the result of the breaker tripping instruction. If the tripping instruction result is "maintain", the main power supply circuit continues to supply power. If the tripping instruction result is "trigger", the incoming line breaker performs a disconnection operation to switch to the emergency power supply circuit.

[0023] Before performing formula calculations on the relevant parameters in this embodiment, normalization or dimensionless processing can be performed as needed.

[0024] The method for obtaining the tripping instruction result is as follows: Obtain the effective value of the current, the voltage phase angle, and the output value of the short - circuit detector signal; the microprocessor receives the effective value of the current, the voltage phase angle, and the output value of the short - circuit detector signal and runs a piece - wise function to obtain the tripping instruction result.

[0025] The piece - wise function is: ; Where: is the tripping instruction result of the breaker, is the effective value of the current, is the rated current of the breaker, is the voltage phase angle, is the output value of the short - circuit detector signal output by the short - circuit detector.

[0026] The *1.2 in the piece - wise function is a common value in the field of electrical protection. It can not only allow the current to fluctuate normally within a certain range but also trigger the breaker to trip in a timely manner when the current continues to be overloaded to a dangerous level, cutting off the circuit to prevent equipment from being damaged due to overload. It will neither trip frequently due to excessive sensitivity nor ignore potential overload risks.

[0027] When is 1, directly trigger the breaker to trip, indicating that a short - circuit fault is detected and the circuit needs to be cut off immediately to ensure safety; the above special values together constitute a comprehensive judgment logic for the circuit state, ensuring reliable tripping of the power supply system during abnormalities and stable operation during normal times.

[0028] Then enter the signal transmission and processing stage. The current signal is processed through a sampling circuit to obtain the effective value of the current; the voltage signal is analyzed to obtain the voltage phase angle. The digital signal output by the short - circuit detector (i.e., the output value of the short - circuit detector signal), together with the effective value of the current and the voltage phase angle, is transmitted to the microprocessor integrated in the intelligent control unit of the breaker. After receiving these signals, the microprocessor starts to run the tripping function algorithm to comprehensively analyze the circuit state.

[0029] The microprocessor determines whether the effective value of the current exceeds 1.2 times the rated current of the circuit breaker, and at the same time determines whether the voltage phase angle is within a specific range (this range can assist in judging whether there is an abnormal deviation in the circuit); or checks whether the output value of the short - circuit detector is 1 (indicating that a short - circuit fault is detected). If either the condition of "current overload and abnormal phase angle" or "detection of short - circuit" is met, the microprocessor immediately outputs a trigger instruction to drive the tripping component of the circuit breaker to act and perform a breaking operation, quickly cutting off the circuit to prevent equipment damage due to overload or short - circuit. If the above - mentioned trigger conditions are not met, the microprocessor controls the circuit to maintain the current state without performing a break, preventing frequent misoperations caused by over - sensitivity.

[0030] By using multi - signal fusion for judgment, the judgment process is more accurate and can avoid misjudgment caused by a single parameter. Combining current and phase angle can accurately identify abnormalities, and the short - circuit signal directly triggers the break, improving the timeliness of short - circuit protection; the value of 1.2 times the rated current is reasonable, balancing overload protection and normal fluctuations, which can not only prevent frequent mis - breaking but also timely respond to overload risks, ensuring equipment safety, overall improving power supply reliability, achieving reliable breaking during abnormalities and stable operation during normal times, and optimizing the circuit protection mechanism.

[0031] When the emergency power supply circuit is powered, the emergency power supply voltage is dynamically adjusted based on the environment - adaptive charging function to obtain the corrected charging voltage.

[0032] The specific process is as follows: Obtain the power supply data of the emergency power supply circuit, including battery temperature, humidity sensor value, and initial charging voltage value; based on the battery management system (BMS), analyze and obtain the SOH compensation coefficient.

[0033] Run the environment - adaptive charging function, and combine the SOH compensation coefficient to obtain the corrected charging voltage: ; Where: is the corrected charging voltage, is the initial charging voltage value, is the temperature - related adjustment coefficient, is the humidity - related adjustment coefficient, is the battery temperature, is the humidity sensor value, is the SOH compensation coefficient.

[0034] Based on the battery management system, the battery internal resistance, remaining capacity, and charge - discharge cycle times are obtained in real - time.

[0035] Run the SOH evaluation function: ; Where: is the remaining capacity, is the rated capacity, is the number of charge-discharge cycles, is the internal resistance of the battery, is the initial internal resistance.

[0036] The calculation formula for the SOH compensation coefficient is: ; Based on the calculated SOH, if the SOH is less than 0.8, the charging voltage adjustment operation is performed to increase the charging voltage. If the SOH is not less than 0.8, no adjustment is made.

[0037] The purpose of 0.001 in this formula is to quantify the effect of temperature on the charging voltage, and 0.005 is to reflect the intensity of the effect of humidity on the charging voltage.

[0038] By precisely controlling the charging voltage output, the charging circuit receives the adjusted drive signal and adjusts the output voltage in real time based on this. When the battery temperature rises or the ambient humidity changes, the circuit output voltage is dynamically adjusted accordingly, avoiding overcharging caused by excessive temperature or abnormal humidity affecting the charging stability. This dynamic regulation mechanism ensures that the charging voltage is always at the optimal level, not only improving the charging efficiency but also effectively extending the service life of the energy storage battery, ensuring reliable operation of emergency power supply under different environmental conditions, providing a stable energy reserve for subsequent emergency power supply, and enhancing the emergency support ability.

[0039] Introducing the battery state of health (SOH) monitoring and dynamic charging voltage compensation mechanism during emergency power supply. By real-time evaluating the battery aging degree (such as internal resistance growth, capacity attenuation, number of cycles), dynamically adjusting the charging parameters, it can accurately compensate for the energy loss caused by battery performance attenuation, automatically increase the charging voltage when the battery health (SOH) is below 80%, ensure the stability of the emergency power supply capacity, and avoid the risk of power supply interruption caused by battery aging in traditional technologies; at the same time, this mechanism works in coordination with the environment adaptive charging strategy (temperature and humidity compensation) to form a multi-dimensional dynamic regulation system, which not only extends the battery life (reducing overcharging / undercharging damage), but also significantly improves the power supply reliability and intelligent level under complex working conditions (such as high temperature, high humidity, and battery aging after long-term use).

[0040] In the case where the result of the disconnection instruction is to hold, obtain the power supply switching instruction. If the power supply switching instruction is to switch, switch the emergency power supply circuit. If the power supply switching instruction is to hold, the main power supply circuit continues to supply power.

[0041] Specifically, obtaining the power supply switching instruction is: Obtain the data of the main power supply circuit, including the main power supply voltage, the current power of the energy storage battery, the analog signal value of the lightning sensor, and the rated power of the energy storage battery.

[0042] Run the sudden power failure switching function to obtain a power supply switching instruction: ; Where: is the output switching instruction (for the system in Embodiment 2, it is the instruction output by the intelligent switching module), is the main power supply voltage, is the main power supply voltage threshold, is the lightning strike signal trigger threshold, is the analog signal value of the lightning strike sensor, is the current stored energy battery power, is the rated power of the stored energy battery.

[0043] 0.6 is the stored energy battery state coefficient, and it is required that , that is, the current state of the battery needs to be higher than 60% of the rated state, ensuring that there is enough power to support the emergency power supply after switching, and avoiding power supply interruption due to insufficient battery power after switching.

[0044] This process realizes fast and reliable power supply switching by real-time monitoring of various signals, accurate analysis of working conditions, and combining the advantages of two types of switches, effectively coping with sudden situations such as abnormal main power supply or lightning strikes, comprehensively ensuring the safety and continuity of power supply, ensuring stable operation under complex working conditions, and providing solid support for subsequent emergency power supply.

[0045] Monitor the power supply status and determine the current of each branch of the main power supply circuit or the emergency power supply circuit, predict the probability of power supply equipment failure, and determine the communication protocol based on the communication status.

[0046] The process of monitoring the power supply status and determining the current of each branch of the main power supply circuit or the emergency power supply circuit is as follows: Obtain the maximum output current of the battery, the external interference score, and the active power of each branch; run the branch current compensation and distribution formula to obtain the current of each branch: ; Where: is the branch current of the i-th branch, is the active power of the i-th branch, Interfere is the external interference score, is the maximum output current of the battery, i is the number of the target load branch, and n is the total number of branches.

[0047] Based on an electromagnetic compatibility tester, obtain the electromagnetic radiation intensity of each frequency band, and analyze to obtain the electromagnetic interference score corresponding to the electromagnetic interference level; based on a voltage monitor and a current monitor, obtain the voltage fluctuation amplitude and frequency fluctuation, and analyze to obtain the power supply fluctuation score corresponding to the power supply fluctuation level; based on a temperature and humidity sensor, obtain the temperature change amplitude and humidity change amplitude, and analyze to obtain the environmental interference score corresponding to the environmental interference level; perform weighted summation on the obtained electromagnetic interference score, power supply fluctuation score, and environmental interference score to obtain the external interference score.

[0048] Among them, the process of obtaining the electromagnetic interference score is as follows: Compare the electromagnetic radiation intensity of each frequency band with the electromagnetic radiation intensity evaluation interval stored in the data repository. If one or more electromagnetic radiation intensities fall within the electromagnetic radiation intensity evaluation interval (for example, [10 V / m, 50 V / m]), then the electromagnetic interference level is electromagnetic interference level two, and the electromagnetic interference score corresponding to electromagnetic interference level two is 2.

[0049] If not, and all are less than the minimum value of the electromagnetic radiation intensity evaluation interval, then the electromagnetic interference level is electromagnetic interference level one, and the electromagnetic interference score corresponding to electromagnetic interference level one is 1.

[0050] If all are greater than the maximum value of the electromagnetic radiation intensity evaluation interval, then the electromagnetic interference level is electromagnetic interference level three, and the electromagnetic interference score corresponding to electromagnetic interference level three is 3.

[0051] The process of obtaining the power supply fluctuation score is as follows: Compare the voltage fluctuation amplitude with the voltage fluctuation amplitude evaluation interval stored in the data repository (for example, [5%, 10%] of the rated voltage), and compare the frequency fluctuation with the frequency fluctuation evaluation interval stored in the data repository (for example, ±0.2 Hz - ±0.5 Hz). If the voltage fluctuation amplitude is less than 5% of the rated voltage and the frequency fluctuation is within ±0.2 Hz, then the power supply fluctuation level is power supply fluctuation level one, and the power supply fluctuation score corresponding to power supply fluctuation level one is 1.

[0052] If the voltage fluctuation amplitude is between 5% and 10% of the rated voltage and the frequency fluctuation is between ±0.2 Hz and ±0.5 Hz, then the voltage fluctuation level is voltage fluctuation level two, and the power supply fluctuation score corresponding to voltage fluctuation level two is 2. If the voltage fluctuation amplitude exceeds 10% of the rated voltage and the frequency fluctuation exceeds ±0.5 Hz, then the power supply fluctuation level is power supply fluctuation level three, and the power supply fluctuation score corresponding to power supply fluctuation level three is 3.

[0053] The process of obtaining the environmental interference score is as follows: Compare the temperature change range with the temperature change range evaluation interval (e.g., [-5°C, +5°C]) stored in the data repository, and compare the humidity change range with the humidity change range evaluation interval (e.g., [-10%RH, +10%RH]) stored in the data repository. If the temperature change range is within ±5°C, the humidity change range is within ±10%RH, and both are within the normal operating environment requirements of the device, the environmental interference level is environmental interference level one, and the environmental interference score corresponding to environmental interference level one is 1.

[0054] If the temperature change range or the humidity change range exceeds the above range but does not cause a significant decline in the device performance, the environmental interference level is environmental interference level two, and the environmental interference score corresponding to environmental interference level two is 2. If the temperature change range or the humidity change range exceeds the normal operating environment requirements of the device, resulting in device failure or a serious decline in performance, the environmental interference level is environmental interference level three, and the environmental interference score corresponding to environmental interference level three is 3.

[0055] The calculation formula for predicting the failure probability of the power supply device is: ; Where: is the device failure probability, is the basic failure rate of the device, E is the environmental impact factor, S is the device operating state factor, is the temperature impact coefficient, T is the current temperature, is the reference temperature, H is the current humidity, is the reference humidity, is the humidity impact coefficient, is the failure rate increase coefficient when the device operates abnormally.

[0056] Obtain the communication status data of each candidate communication protocol, including the received signal strength, the external electromagnetic interference strength, and the signal attenuation amount.

[0057] Process the communication status data of each candidate communication protocol based on the communication protocol comprehensive score function to obtain the highest communication protocol comprehensive score: ; Where: Pro is the highest communication protocol comprehensive score, p is the number of the communication protocol, is the received signal strength of the p-th communication protocol, is the external electromagnetic interference strength received by the p-th communication protocol, is the signal attenuation amount of the p-th communication protocol.

[0058] Determine the candidate communication protocol corresponding to the highest communication protocol comprehensive score and use it as the finally determined communication protocol.

[0059] Calculate the comprehensive scores of different communication protocols, obtain the highest comprehensive score, and automatically switch to the communication protocol corresponding to the highest comprehensive score.

[0060] Under the power supply state of the emergency power supply loop, determine the load power supply priority. The process is as follows: Obtain the interference type of the external interference signal; retrieve the interference type - priority adjustment coefficient mapping table stored in the database.

[0061] Based on the determined interference type of the external interference signal, obtain the priority adjustment coefficient, and run the priority adjustment rule model to obtain the load power supply priority: ; Where: is the current priority, is the original priority, is the priority adjustment coefficient corresponding to the interference type.

[0062] Under the power supply state of the emergency power supply loop, determine the load power supply priority to preferentially supply power to high - priority loads to ensure stable power support for them in emergencies.

[0063] is a key parameter used to reflect the influence degree of external interference on the load priority. When receiving the external interference type signal, this coefficient will dynamically adjust the original priority according to the interference type (such as lightning strike, voltage dip, etc.). For example, under strong interference, may be a positive value to increase the priority of critical loads to ensure their power supply; if the interference has little impact, this coefficient may reduce the priority adjustment range to ensure flexible optimization of the load power supply sequence in different interference scenarios and improve the pertinence and effectiveness of emergency power supply.

[0064] Through flexible anti - interference, dynamically adjust the priority according to the interference type (such as lightning strike, voltage dip). Under strong interference, increase the priority of critical loads to ensure their power supply stability; then optimize resources, reduce the priority of non - critical loads, reasonably allocate power, improve power utilization efficiency, enhance reliability, ensure the continuous operation of critical loads under complex working conditions, and reduce the risk of service interruption. Through strong pertinence, different interferences correspond to different adjustment coefficients, which is more in line with the actual scenario than the fixed priority, improving the accuracy and effectiveness of emergency power supply and enabling the emergency power supply method to operate efficiently in the interference environment.

[0065] Embodiment 2: A cable branch box emergency power supply system for implementing the method in Embodiment 1, as Figure 2 shown, includes: The main power supply module obtains the result of the circuit breaker tripping instruction. If the tripping instruction result is "maintain", the main power supply circuit continues to supply power. If the tripping instruction result is "trigger", the incoming line circuit breaker performs a disconnection operation to switch to the emergency power supply circuit; The emergency power supply module, when the emergency power supply circuit is supplying power, dynamically adjusts the emergency power supply voltage based on the environment adaptive charging function to obtain the corrected charging voltage; The intelligent switching module, when the tripping instruction result is "maintain", obtains the power supply switching instruction. If the power supply switching instruction is "switch", it switches the emergency power supply circuit. If the power supply switching instruction is "maintain", the main power supply circuit continues to supply power; The monitoring module monitors the power supply status, determines the current of each branch of the main power supply circuit or the emergency power supply circuit, predicts the failure probability of the power supply equipment, and determines the communication protocol based on the communication status; The load management module determines the load power supply priority when the emergency power supply circuit is in the power supply state.

[0066] A specific implementation of each module is as follows: The main power supply module: includes an intelligent tripping incoming line circuit breaker, a high-precision voltage transformer and a current transformer, which are used to execute the on-off control of the power supply circuit, collect voltage signals, and collect current signals. A microprocessor is integrated in the circuit breaker intelligent control unit, and the microprocessor runs a piecewise function algorithm to drive the tripping component of the circuit breaker to execute the tripping instruction.

[0067] The main power supply module is equipped with an intelligent tripping incoming line circuit breaker, a high-precision voltage transformer and a current transformer. The voltage transformer continuously collects the voltage signal in the circuit, and the current transformer is responsible for collecting the current signal. The two provide basic electrical parameters for the system. At the same time, the short-circuit detector constantly monitors whether there is a short-circuit fault in the circuit and outputs a corresponding signal to provide a basis for subsequent judgment of the circuit state.

[0068] The emergency power supply module: consists of an energy storage battery pack managed by active balancing, a bidirectional inverter and a charging controller, which are used to store electrical energy, realize the conversion of DC and AC electrical energy, and control the battery charging process. The charging controller uses a digital signal processor as the core, connects to the battery temperature sensor, humidity sensor values, and battery management system to obtain the battery temperature, humidity sensor values, and initial charging voltage. The digital signal processing runs an adaptive charging function to dynamically adjust the pulse width modulation drive signal to obtain the corrected charging voltage.

[0069] With the digital signal processor as the core control unit, it first connects to a highly sensitive battery temperature sensor, which continuously monitors the temperature on the surface or inside of the battery and accurately captures every degree of change; reads the temperature and humidity sensor values and continuously feeds back the current ambient humidity value.

[0070] The digital signal processor calls the built-in environmental adaptive charging function to conduct a comprehensive analysis of the collected data, fully considering the impact of temperature changes on battery chemical reactions, and the potential effect of humidity on the insulation performance and current transmission of charging equipment, and calculates the most appropriate charging voltage adjustment plan under the current state, ensuring that the charging process not only meets the current state requirements of the battery, but also can adapt to external environmental conditions.

[0071] Based on the calculation results, the digital signal processor dynamically adjusts the pulse width modulation drive signal, adjusts the duty cycle of the drive signal by precisely changing the width of the pulse, and thus controls the on and off time of the power devices in the charging circuit. The fine adjustment method can convert the voltage adjustment instructions into specific and executable electrical signal parameters, providing precise drive support for subsequent voltage control.

[0072] Intelligent switching module: It uses a composite structure of solid-state relays and mechanical switches to perform the switching operation between the main power supply and the emergency power supply circuit. The control unit of the intelligent switching module collects the main power supply voltage and the rated power of the energy storage battery in real time, receives the analog signal value of the lightning strike sensor, and the control unit has a built-in integrated chip to run the sudden power failure switching function and output the switching instruction according to the logical judgment result.

[0073] The control unit is used to continuously and in real time collect the voltage signal of the main power supply, and closely monitor whether the main power supply has abnormalities such as voltage drop and power outage; at the same time, the voltage signal of the energy storage battery is collected to accurately grasp the real-time power supply and provide a basis for power supply for switching. In addition, the control unit receives the analog signal of the lightning strike sensor and detects the intensity of lightning strike interference in real time. The control unit has a built-in integrated chip to run the switching function and perform logical judgment on the signal. When the main power supply voltage is too low or the lightning strike signal exceeds the safety threshold, and the power of the energy storage battery is higher than a certain percentage of the rated state (such as 60%), which is sufficient to ensure emergency power supply, the switching command is triggered.

[0074] When executing the switching, the solid-state relay is first driven to conduct quickly, and its extremely fast response speed is used to establish a temporary power supply path in a very short time to avoid long-term power outages. Then, the mechanical switch is controlled to complete the formal switching of the main power supply and emergency power supply circuits. This composite structure fully combines the advantages of the solid-state relay's fast response and the mechanical switch's stable conduction, ensuring both the rapidity of switching and the stability of the power supply circuit after switching.

[0075] Monitoring module: Integrates dual-core main controller, multi-mode communication unit and lightning strike sensor, traveling wave short circuit detector, temperature and humidity sensor, used to process system data, perform communication functions, monitor lightning strike signals, detect short circuit faults, and collect environmental temperature and humidity data.

[0076] The monitoring module comprehensively senses information such as lightning strikes, short circuits, temperature and humidity, etc. The communication unit real-time monitors signal strength, electromagnetic interference and data types, and uses a switching function to comprehensively evaluate and select the optimal communication protocol. The advantages are as follows: First, it greatly improves communication reliability. In a complex interference environment (such as strong electromagnetic interference), it automatically adapts to anti-interference protocols to ensure stable data transmission; second, it improves transmission efficiency. It optimizes the protocol according to signal strength and data types to reduce latency; third, it enhances system adaptability. It can flexibly respond to various interference scenarios, ensure smooth communication between modules, improve the overall system performance, and ensure stable operation under working conditions such as lightning strikes and temperature and humidity changes.

[0077] Load management module: It includes a dynamic priority decision module and a power adjustment module, which are used to analyze load priorities and adjust and allocate the power of each load branch.

[0078] The priority decision module of the load management module is used, including: input load type, external interference type, and output current priority; the priority decision module has a preset load type priority table built-in. When receiving an external interference type signal, according to the priority adjustment coefficient corresponding to the external interference type stored in the data repository, the original priority is adjusted, and the current priority is sent to the power adjustment module through the bus.

[0079] The dynamic priority decision module has a load type priority table formulated according to the importance of the load built-in, which clarifies the initial priorities of various loads. For example, key loads such as medical equipment and communication base stations have high priorities, and non-key loads such as ordinary lighting have low priorities.

[0080] When the sensor detects an external interference type signal (such as a lightning strike, voltage dip) and transmits it, the module immediately matches the corresponding priority adjustment coefficient according to the interference type. For example, in case of strong interference, the adjustment coefficient of the key load increases its priority, and the adjustment coefficient of the non-key load decreases its priority; subsequently, the module recalculates according to the adjustment coefficient to generate a new priority list, and quickly and accurately transmits it to the power adjustment module through the bus.

[0081] After receiving the new priority, the power adjustment module accurately adjusts the power of each load branch, reduces the power distribution of non-key loads, and preferentially supplies more power resources to high-priority key loads to ensure the stable operation of key loads in an interference environment, realizing the reasonable allocation and efficient utilization of power resources.

Claims

1. A cable branch box emergency power supply method, characterized in that: include: Obtain the circuit breaker disconnection command result. If the disconnection command result is maintained, the main power supply circuit continues to supply power. If the disconnection command result is triggered, the incoming circuit breaker performs a disconnection operation and switches the emergency power supply circuit. When the emergency power supply circuit supplies power, the emergency power supply voltage is dynamically adjusted based on the environment adaptive charging function to obtain a corrected charging voltage; When the disconnection instruction result is hold, obtain the power supply switching instruction. If the power supply switching instruction is switch, the emergency power supply circuit is switched. If the power supply switching instruction is hold, the main power supply circuit continues to supply power. Monitor the power supply status and determine the current of each branch of the main power supply circuit or emergency power supply circuit, predict the probability of power supply equipment failure, and determine the communication protocol based on the communication status; When the emergency power supply circuit is in power supply state, determine the load power supply priority.

2. A cable branch box emergency power supply method according to claim 1, characterized in that: The method for obtaining the result of the breaking instruction is as follows: Obtain the output value of the current effective value, voltage phase angle, and short-circuit detector signal; The microprocessor receives the current effective value, voltage phase angle, and output value of the short-circuit detector signal and runs the piecewise function to obtain the breaking instruction result. The piecewise function is: ； in: is the breaking command result of the circuit breaker, is the effective value of current, is the rated current of the circuit breaker, is the voltage phase angle, The output value of the short-circuit detector signal output by the short-circuit detector.

3. A cable branch box emergency power supply method according to claim 1, characterized in that: Dynamically adjust the emergency power supply voltage based on the environmental adaptive charging function to obtain the corrected charging voltage. The process is as follows: Obtain emergency power supply circuit power supply data, including battery temperature, humidity sensor value, and charging voltage initial value; Based on the battery management system, the SOH compensation coefficient is analyzed and obtained; The operating environment adaptive charging function is combined with the SOH compensation coefficient to obtain the corrected charging voltage: ； in: is the corrected charging voltage, is the initial value of the charging voltage, is the temperature-dependent adjustment factor, is the humidity related adjustment factor, is the battery temperature, is the humidity sensor value, is the SOH compensation coefficient.

4. A cable branch box emergency power supply method according to claim 3, characterized in that: The SOH compensation coefficient is obtained by analysis, including the following steps: Based on the battery management system, real-time acquisition of battery internal resistance, remaining capacity, and number of charge and discharge cycles; Run the SOH evaluation function: ； in: is the remaining capacity, is the rated capacity, is the number of charge and discharge cycles, is the internal resistance of the battery, is the initial internal resistance; The SOH compensation coefficient calculation formula is: ； Based on the calculated SOH, if the SOH is less than 0.8, a charging voltage adjustment operation is performed to increase the charging voltage. If the SOH is not less than 0.8, no adjustment is performed.

5. The cable branch box emergency power supply method according to claim 1 is characterized in that: When the disconnection instruction result is maintained, obtaining the power supply switching instruction includes the following steps: Obtain the main power supply circuit data, including the main power supply voltage, the current energy storage battery power, the analog signal value of the lightning strike sensor, and the rated power of the energy storage battery; Run the sudden power off switching function to get the power supply switching instruction: ； in: is the switching instruction for the output, is the main power supply voltage, is the main power supply voltage threshold, is the lightning signal trigger threshold, is the analog signal value of the lightning strike sensor, is the current energy storage battery capacity, is the rated capacity of the energy storage battery.

6. A cable branch box emergency power supply method according to claim 1, characterized in that: Monitor the power supply status and determine the current of each branch of the main power supply circuit or emergency power supply circuit. The process is as follows: Obtain the maximum output current of the battery, external interference score and active power of each branch; Run the branch current compensation distribution formula to obtain the current of each branch: ； in: is the branch current of the ith branch, is the active power of the ith branch, Interfere is the external interference score, is the maximum output current of the battery, i is the number of the target load branch, and n is the total number of branches.

7. A cable branch box emergency power supply method according to claim 6, characterized in that: Obtaining the external interference score includes the following steps: Based on the electromagnetic compatibility tester, the electromagnetic radiation intensity of each frequency band is obtained, and the electromagnetic interference score corresponding to the electromagnetic interference level is analyzed; Based on the voltage monitor and current monitor, the voltage fluctuation amplitude and frequency fluctuation are obtained, and the power fluctuation score corresponding to the power fluctuation level is obtained through analysis; Based on the temperature and humidity sensors, the temperature change amplitude and humidity change amplitude are obtained, and the environmental interference score corresponding to the environmental interference level is analyzed; The obtained electromagnetic interference score, power supply fluctuation score and environmental interference score are weighted and summed to obtain the external interference score.

8. The cable branch box emergency power supply method according to claim 1, characterized in that: Determine the communication protocol based on the communication status. The process is as follows: Obtaining the communication status data of each selected communication protocol, including the received signal strength, external electromagnetic interference strength, and signal attenuation; Based on the communication protocol comprehensive score function, the communication status data of each candidate communication protocol is processed to obtain the highest communication protocol comprehensive score: ； Among them: Pro is the highest comprehensive score of the communication protocol, p is the number of the communication protocol, is the received signal strength of the pth communication protocol, is the external electromagnetic interference intensity of the pth communication protocol, is the signal attenuation of the pth communication protocol; The candidate communication protocol corresponding to the highest communication protocol comprehensive score is determined and used as the final communication protocol.

9. A cable branch box emergency power supply method according to claim 1, characterized in that: In the emergency power supply circuit state, determine the load power supply priority, the process is as follows: Obtain the interference type of the external interference signal; Retrieving an interference type-priority adjustment coefficient mapping table stored in a database; Based on the interference type of the determined external interference signal, the priority adjustment coefficient is obtained, and the priority adjustment rule model is run to obtain the load power supply priority: ； in: is the current priority, is the original priority, is the priority adjustment coefficient corresponding to the interference type.

10. A cable branch box emergency power supply system, used to implement the method according to any one of claims 1 to 9, characterized in that: include: The main power supply module obtains the circuit breaker disconnection instruction result. If the disconnection instruction result is maintained, the main power supply circuit continues to supply power. If the disconnection instruction result is triggered, the incoming circuit breaker performs a disconnection operation and switches the emergency power supply circuit. The emergency power supply module dynamically adjusts the emergency power supply voltage based on the environment adaptive charging function when the emergency power supply circuit is supplying power to obtain a corrected charging voltage; The intelligent switching module obtains the power supply switching instruction when the disconnection instruction result is maintained. If the power supply switching instruction is switched, the emergency power supply circuit is switched. If the power supply switching instruction is maintained, the main power supply circuit continues to supply power. Monitoring module, which monitors the power supply status and determines the current of each branch of the main power supply circuit or the emergency power supply circuit, predicts the probability of power supply equipment failure, and determines the communication protocol based on the communication status; The load management module determines the load power supply priority when the emergency power supply circuit is in power supply state.

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