A power distribution control system for a multi-branch circuit of an electric energy metering box

Abstract

The present application relates to the technical field of power distribution and intelligent power consumption control, in particular to a power distribution control system for multi-branch circuit of electric energy metering box, which comprises collecting real-time environmental temperature, incoming line voltage, real-time current of each branch circuit and terminal voltage, obtaining pre-configured total incoming line capacity and historical power consumption data, and calculating actual power; obtaining predicted power according to historical average power of the same type of day, actual average power in the preset time period before the current time and temperature difference; calculating comprehensive priority by combining basic important grade, real-time current and predicted power; generating allowable power upper limit according to total incoming line capacity and issuing control terminal to execute power control; at the end of the preset period, iteratively updating weight parameters according to historical error between predicted power and actual power, realizing on-demand distribution and reducing overload lag.

Description

Technical Field

[0001] This invention relates to the field of power distribution and intelligent power control technology, specifically to a power distribution control system for a multi-branch circuit of an energy metering box. Background Technology

[0002] In the power supply management of electricity metering boxes, power distribution and control for multiple branch circuits is an important means to ensure the stable operation of various power terminals in the box. Especially in scenarios where the total incoming line capacity is limited and the load of each circuit fluctuates significantly, it is even more necessary to coordinate and control the power consumption status of each branch circuit.

[0003] Currently, branch circuit control in electricity metering boxes mostly adopts fixed threshold alarms, fixed sequence cut-off, or power distribution processing based solely on preset importance levels. If it is necessary to achieve coordinated power supply of multiple circuits when the total capacity is tight, static rules are usually set based on manual experience to obtain the corresponding circuit power supply sequence and power limiting strategy.

[0004] However, when distributing power to the electricity metering box using the above methods, the judgment is usually based only on real-time current or a single fixed threshold. When the total incoming line capacity is limited, there is often a problem of lagging adjustment of quotas for multiple branch circuits. It is impossible to generate a power distribution strategy that matches the current operating conditions in advance, and it is easy to cause malfunctions of the fixed threshold. In addition, in practical engineering applications, conventional fixed distribution strategies are difficult to take into account secondary edge situations such as excessive voltage drop in local lines and communication abnormalities, resulting in insufficient overall power supply stability and adaptive capability of the system under complex power distribution conditions. Summary of the Invention

[0005] The purpose of this invention is to provide a power distribution control system for multi-branch circuits in energy metering boxes, addressing the following technical problems: Existing branch circuit power distribution control technologies for energy metering boxes suffer from issues such as lagging quota adjustment when the total incoming line capacity is limited, susceptibility to fixed threshold malfunctions, and insufficient control continuity during communication interruptions. There is an urgent need for a load-forward-based power distribution control system for energy metering boxes that can accurately predict load based on ambient temperature and recent electricity consumption trends, dynamically calculate comprehensive priorities based on real-time load, generate allowable power limits while considering line status parameters, and assist in optimizing distribution by considering line status and off-center loads, while also supporting offline independent control. This invention can achieve its objective through the following technical solutions:

[0006] A power distribution control system for a multi-branch circuit in an energy metering box, the system including a local controller installed inside the energy metering box, and branch sampling control terminals connected to the local controller via communication terminals. The energy metering box also includes an incoming line sampling module for collecting incoming line parameters, and branch measurement and control units for independent measurement and control of each circuit. The local controller includes:

[0007] The data acquisition module is used to collect real-time ambient temperature and incoming voltage at the power metering box, and to collect real-time current and terminal voltage at the outgoing end through the branch sampling control terminal corresponding to each branch circuit; to obtain the total incoming capacity pre-configured or determined by the rated parameters on the incoming side, as well as the historical power consumption data of each branch circuit stored locally or issued by the upper-level control node; and to directly obtain the actual active power of each branch circuit by the metering chip, or to calculate the actual power of each branch circuit based on the real-time current, the terminal voltage, and the power factor.

[0008] The load forecasting module is used to predict the power of each branch circuit based on the historical electricity consumption data and the real-time ambient temperature, and obtain the predicted power of each branch circuit.

[0009] The priority calculation module is used to obtain the pre-configured basic importance level of each branch circuit and determine the current allowable power limit. The current allowable power limit is based on the preset basic quota or the rated power of the corresponding circuit in the initial state or when the quota is invalid. In the normal operation cycle, the allowable power limit of the previous cycle is extracted and converted according to the ratio of the current total incoming capacity to the total incoming capacity of the previous cycle, and is only used as a reference for quota tension calculation. The module calculates the comprehensive priority of each branch circuit based on the real-time current, the predicted power, the current allowable power limit, and the basic importance level.

[0010] The power allocation module is used to generate the allowable power limit for each branch circuit based on the predicted power, the overall priority, and the total incoming line capacity.

[0011] The control module is used to send the allowable power limit to the control terminal corresponding to each branch circuit, and to perform power control on each branch circuit according to the allowable power limit and the real-time current, as well as to communicate with the external local centralized controller.

[0012] Optionally, the load forecasting module includes:

[0013] The basic prediction unit is used to obtain the average power of each branch circuit during the corresponding time period of the same type of historical day, and the actual average power during the preset time period before the current time, based on the historical electricity consumption data.

[0014] A temperature correction unit is used to obtain the temperature difference between the real-time ambient temperature and the preset reference temperature, and multiply the temperature difference, the average power and the actual average power by preset corresponding weight parameters and sum them up. The weight parameter corresponding to the temperature difference includes the equivalent conversion dimension of power and temperature, and the predicted power is calculated.

[0015] Optionally, the load forecasting module further includes:

[0016] The parameter update unit is used to calculate the historical error between the predicted power and the actual power at the end of the preset period, and to correct the weight parameters corresponding to the average power, the actual average power and the temperature difference periodically by means of moving average error correction or by retrieving an offline calibration table; wherein the correction process is constrained by the set upper and lower limits of the weight and the limit of the single weight adjustment range, and supports stopping the automatic correction of the weight parameters by means of a manual locking function.

[0017] Optionally, the priority calculation module includes:

[0018] The load rate calculation unit is used to calculate the real-time load rate of each branch circuit based on the real-time current and the pre-acquired rated current of each branch circuit.

[0019] The priority calculation unit is used to multiply the basic importance level, the real-time load rate, and the quota tension by their respective preset weights and sum them to calculate the comprehensive priority; wherein, the quota tension is the ratio of the predicted power to the current allowable power limit.

[0020] Optionally, the priority calculation module further includes:

[0021] The weight adjustment unit is used to increase the weight of the real-time load rate in the comprehensive priority calculation when it is detected that the real-time load rate is greater than a preset ratio threshold and the real-time load rate at the current moment is greater than the real-time load rate at the previous moment; wherein the increased weight does not exceed a preset weight upper limit; when the real-time load rate is lower than a preset recovery threshold, or when the fluctuation of the real-time load rate is within a preset stable range and the duration reaches a preset hysteresis time, the weight is restored to the default weight.

[0022] Optionally, the power distribution module includes:

[0023] The line status assessment unit is used to calculate the difference between the incoming line voltage and the terminal voltage, and under effective sampling conditions, divide the difference by the real-time current to estimate the line status parameters of each branch circuit. The line status parameters are used as quota correction factors.

[0024] The quota allocation unit is used to allocate the upper limit of allowable power in full according to the predicted power when the sum of the predicted power of each branch circuit is less than or equal to the total incoming line capacity; and to generate the upper limit of allowable power according to the comprehensive priority and the line status parameters when the sum of the predicted power of each branch circuit is greater than the total incoming line capacity.

[0025] Optionally, when the quota allocation unit generates the allowed power limit:

[0026] When the overall priority is greater than the preset score threshold, the upper limit of the allowed power is fully allocated according to the corresponding predicted power;

[0027] When the overall priority is less than or equal to the preset score threshold, the remaining available power is calculated based on the difference between the total incoming line capacity and the sum of the allocated allowable power limits. Under the premise of ensuring the lower limit of the preset basic quota of the corresponding branch circuit, the line status parameters are used only as fine-tuning weights to allocate the remaining available power, so that the allowable power limit increment obtained by the branch circuit with larger line status parameters is limited.

[0028] Optionally, the control module includes:

[0029] An alarm unit is used to generate a quota alarm command and send it to the local centralized controller when the actual power of the branch circuit reaches a preset warning threshold corresponding to the upper limit of the allowable power.

[0030] The quota adjustment unit is used to receive the quota alarm command and calculate the total incoming power margin based on the difference between the total incoming capacity and the sum of the actual power of each branch circuit, after deducting a preset delay compensation margin. When the total incoming power margin is greater than zero, an allowable power limit is added to the corresponding branch circuit that triggered the quota alarm command. When the total incoming power margin is less than or equal to zero, a rejection command is issued, causing the control terminal of the corresponding branch circuit to perform local current limiting operation when the actual power reaches the allowable power limit, if it has electronic current limiting capability, and output a trip control signal or alarm prompt when it does not have electronic current limiting capability.

[0031] Optionally, the control module further includes:

[0032] A threshold adjustment unit is used to increase the warning threshold when the number of times the warning threshold is triggered consecutively reaches a preset number threshold, and the actual power does not exceed the allowable power limit.

[0033] The offline control unit is used to independently control the power limit that was last valid in the local cache and the basic importance level when an interruption in communication with the local centralized controller is detected, and to upload the actual power extreme value data and status change records during the offline period after communication is restored.

[0034] Optionally, it also includes:

[0035] The off-center load monitoring module is used to calculate the average load rate based on the real-time load rate of each branch circuit, and generate an off-center load alarm message when the absolute value of the difference between the real-time load rate and the average load rate of a certain branch circuit is greater than a preset deviation threshold and the duration reaches a preset time threshold.

[0036] Compared with existing technologies, this invention improves the accuracy and dynamic adaptability of load forecasting. This system performs power forecasting by integrating the average power of the corresponding time period of the same type of historical days, the current recent actual average power, and the temperature difference between the real-time ambient temperature and the reference temperature, and iteratively updates the corresponding weight parameters based on historical errors. This method effectively extracts the recent trends and temperature influence patterns of each loop, and solves the problems of forecast lag and distortion caused by single data dimension and fixed parameters.

[0037] This invention also achieves dynamic optimization that matches the allocation results with actual operating conditions. The system calculates comprehensive priority by combining basic importance level, real-time load rate and quota tension. When capacity is limited, the system prioritizes the allowable power limit of critical circuits based on the priority main line. In addition, as an optional auxiliary optimization mechanism, the system introduces line status parameters for fine-tuning in the allocation of remaining available power, and cooperates with off-center load monitoring and offline control mechanisms under extreme operating conditions. This not only overcomes the problem of rigidity in traditional priority setting, but also further improves the local stability and safety margin of the system in a limited power supply environment from an engineering application perspective. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0039] Figure 1 A schematic diagram of a power distribution control system for a multi-branch circuit of an energy metering box provided in an embodiment of the present invention;

[0040] Figure 2 This is a schematic diagram of the control deployment inside the power metering box of the present invention. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments.

[0042] Please see Figure 1-2A power distribution control system for a multi-branch circuit in an energy metering box, comprising a local controller installed inside the energy metering box, branch sampling control terminals connected to the local controller via communication terminals, an incoming line sampling module for collecting incoming line parameters, and branch measurement and control units for independent measurement and control of each circuit. The local controller includes:

[0043] The data acquisition module is used to collect real-time ambient temperature and incoming voltage at the power metering box, and to collect real-time current and terminal voltage at the outgoing end through the branch sampling control terminal corresponding to each branch circuit; to obtain the total incoming capacity pre-configured or determined by the rated parameters on the incoming side, as well as the historical power consumption data of each branch circuit stored locally or issued by the upper-level control node; and to directly obtain the actual active power of each branch circuit by the metering chip, or to calculate the actual power of each branch circuit based on real-time current, terminal voltage and power factor;

[0044] The load forecasting module is used to predict the power of each branch circuit based on historical electricity consumption data and real-time ambient temperature, and obtain the predicted power of each branch circuit.

[0045] The priority calculation module is used to obtain the pre-configured basic importance level of each branch circuit and determine the current allowable power limit. The current allowable power limit adopts the preset basic quota or the rated power of the corresponding circuit in the initial state or when the quota is invalid. In the normal operation cycle, the allowable power limit of the previous cycle is extracted and converted according to the ratio of the current total incoming capacity to the total incoming capacity of the previous cycle, and is only used as a reference for quota tension calculation. Based on the real-time current, predicted power, current allowable power limit and basic importance level, the comprehensive priority of each branch circuit is calculated.

[0046] The power allocation module is used to generate the allowable power limit for each branch circuit based on the predicted power, overall priority, and total incoming line capacity.

[0047] The control module is used to send the upper limit of allowable power to the control terminal corresponding to each branch circuit, control the power supply of each branch circuit according to the upper limit of allowable power and real-time current, and communicate with the external local centralized controller.

[0048] The load forecasting module includes:

[0049] The basic prediction unit is used to obtain the average power of each branch circuit during the corresponding time period of the same type of day in history, as well as the actual average power during the preset time period before the current time, based on historical electricity consumption data.

[0050] The temperature correction unit is used to obtain the temperature difference between the real-time ambient temperature and the preset reference temperature, and multiply the temperature difference, average power and actual average power by their respective preset weight parameters and sum them up. The weight parameter corresponding to the temperature difference includes the equivalent conversion dimension of power and temperature, and the predicted power is calculated.

[0051] The load forecasting module also includes:

[0052] The parameter update unit is used to calculate the historical error between the predicted power and the actual power at the end of the preset period, and to correct the weight parameters corresponding to the average power, actual average power and temperature difference on a periodic basis by means of moving average error correction or by retrieving offline calibration tables. The correction process is constrained by the set upper and lower limits of the weight and the limit of the single weight adjustment range, and supports stopping the automatic correction of the weight parameters by means of a manual locking function.

[0053] In one embodiment, the present invention is applied to an energy metering box with multiple branch circuits; it acquires real-time ambient temperature, total incoming line capacity, incoming line voltage, historical power consumption data, real-time current, and terminal voltage of each branch circuit; calculates the actual power based on the real-time current and terminal voltage of each branch circuit; further predicts the subsequent power consumption of each branch circuit; calculates the comprehensive priority based on the pre-configured basic importance level; generates the allowable power limit for each branch circuit based on the total incoming line capacity; and sends the allowable power limit to the control terminal corresponding to each branch circuit to execute power control. Through the above processing, when the total capacity of the energy metering box is limited, it no longer uses a statically preset single allocation strategy of fixed-order cut-off, but allocates power according to the actual state and future trend of each circuit.

[0054] Among them, branch circuits refer to the outgoing circuits in the power metering box that are powered by the same incoming line and connected to different power terminals, such as public lighting circuits, charging / socket circuits, communication equipment circuits, etc.; basic importance level refers to the importance of the circuits pre-configured before the system is put into use. For example, communication equipment circuits or safety-related auxiliary circuits that need priority protection can be set as the first priority level, and public lighting circuits can be set as the second priority level; the allowable power limit refers to the maximum power allowed to be used by the corresponding branch circuit in the current allocation cycle. This allocation cycle can be set to 5 to 30 minutes according to the industrial implementation requirements.

[0055] This invention incorporates historical power consumption changes, current real-time load, and ambient temperature into the calculation, extracts the time-period patterns and temperature-related patterns of power consumption in each circuit, and transforms the problems of erroneous and delayed power cut-off caused by fixed threshold unified control into on-demand allocation.

[0056] The embodiments of the present invention can realize the power allocation of each branch circuit based on load prediction and priority calculation, effectively avoiding the response lag of only dealing with the total current exceeding the limit, thereby improving the local overload protection capability and the overall power utilization rate.

[0057] In practical implementation, the data acquisition module can be set between the local controller inside the box and the intelligent control terminal of each branch circuit. The system runs the acquisition task according to the preset sampling cycle; it acquires the real-time ambient temperature, reads the temperature value of the current environment where the metering box is located based on the output of the environmental sensor, and generates temperature sampling results; it acquires the total incoming line capacity and incoming line voltage, and determines the available power supply limit of the power metering box and the current incoming line voltage based on the incoming line detection results, generating total incoming line parameters; it acquires the historical power consumption data, real-time current and terminal voltage of each branch circuit, and records the operating status of the corresponding circuit based on the outgoing line detection results of each branch circuit, generating branch circuit operating data;

[0058] Historical power consumption data refers to the metered power records of each branch circuit over multiple time periods in the past. This historical data is stored in the local controller or upper-level nodes and should at least include historical data for the same type of day corresponding to the current date. "Same type of day" refers to the classification method of corresponding weekdays to weekdays and restdays to restdays. Real-time current refers to the current value in the branch at the current sampling time. Terminal voltage refers to the voltage value detected at the output terminal or load side of the corresponding branch circuit. In practical applications, the actual power can be directly output by the metering chip as active power. In simplified scenarios, it can be estimated based on voltage, current, and power factor; that is, for the i-th branch circuit, it is estimated based on its terminal voltage. Real-time current With power factor The actual power of the circuit is obtained by multiplication. Actual power is used to reflect the actual power consumption level of the circuit at present. For example, when an air conditioner circuit suddenly starts the compressor, the actual power will exceed the preset power fluctuation threshold for a short period of time.

[0059] This invention, by simultaneously collecting temperature, incoming line parameters, and operating data of each branch, forms a correlated input at the same time, which can more accurately reflect the relationship between the total power supply conditions and the branch load, and transforms the dispersed data collection into a unified data foundation that can directly support subsequent allocation calculations.

[0060] The embodiments of the present invention can realize actual power calculation based on uniformly collected data, avoiding the judgment distortion caused by ignoring voltage changes, and making the allocation basis more sufficient;

[0061] Historical power consumption data for each branch circuit is acquired. Based on the power consumption records of the corresponding time period on the same historical day, the power consumption data of each branch circuit is averaged to generate the average power of the corresponding time period on the same historical day. At the same time, the actual power records within a preset time period before the current time are acquired. Based on the actual power within the preset time period, the power consumption data of each branch circuit is averaged to generate the actual average power. Based on the difference between the real-time ambient temperature and the preset reference temperature, the prediction results are temperature corrected to generate the predicted power of each branch circuit.

[0062] The preset time period before the current moment is preferably one hour. This preset time period is used to reflect the recent power consumption trend of the current circuit, such as the continuous increase in air conditioning load in the afternoon and the gradual increase in lighting load in the evening. The preset reference temperature is a reference value for temperature correction and can be a commonly used ambient temperature preset by the system. The difference between the real-time ambient temperature and the reference temperature is recorded as the temperature difference, which is used to characterize the degree to which temperature-controlled loads are affected by environmental changes. The purpose of the predicted power calculation is to take into account historical patterns, recent changes, and temperature factors. The specific logic of the predicted power calculation can be adopted in the following form:

[0063] ;

[0064] In the above formula, the projected electricity demand used to formulate quotas during the current allocation cycle represents the first... Predicted power of each branch loop in the corresponding future time period Based on the average power of this circuit during the same period on similar historical days, which characterizes long-term electricity consumption habits. The actual average power representing the recent electricity consumption trend within a preset time period prior to the current moment. And the deviation of real-time ambient temperature from the reference temperature, which characterizes the additional impact of temperature changes on temperature-sensitive loads such as air conditioners and electric heaters. The calculation shows that, This represents the current time in the allocation cycle. , These are weight parameters with dimensions of 1. This is an equivalent conversion weighting parameter that includes power and temperature unit conversion, with units of W / ℃, and it applies to non-temperature-controlled circuits. These can be set to 0 or a small value, and are used to balance the contributions of historical patterns, recent trends, and temperature factors to the prediction results, respectively; among them, The initial values ​​are determined through offline calibration before the system is put into operation. Specifically, this involves retrieving the historical ambient temperature records and actual power records for the corresponding branch circuit during the same period, calculating the ratio of temperature change to corresponding power change, and performing linear fitting. ,in This represents the historical power variation of the circuit. This represents the corresponding change in ambient temperature. The typical range of values ​​is ℃ Among them, temperature control circuits such as air conditioners and electric heaters take ℃. Non-temperature-controlled circuits such as lighting and communication circuits are used ; , , Satisfying constraints , , , This ensures the normalization contribution of the historical regularity term and the recent trend term, as well as the non-negativity of the temperature correction term; as an example value, , For weight parameters, This refers to the equivalent parameters that include power and temperature conversion;

[0065] This invention does not use historical data in isolation, but rather combines recent average power with temperature difference correction. This allows it to maintain stable predictions when the load is stable on normal days, and to reflect changes promptly when there are sudden temperature changes or short-term increases in load. For example, in the summer afternoon, if the average power of the same type of day at the same time is high, and the actual average power in the current hour continues to rise, while the real-time ambient temperature is higher than the reference temperature, the predicted power will be increased accordingly. For lighting circuits that are not sensitive to temperature, even if the ambient temperature rises, the effect of the temperature difference term on the overall prediction result can be relatively small.

[0066] This invention achieves power prediction by integrating historical trends and real-time temperature differences, thus avoiding the problems of insufficient environmental sensitivity and prediction lag caused by relying solely on historical data.

[0067] The system obtains the predicted power and actual power at the end of the preset cycle. Based on the difference between the predicted power and the actual power, it calculates the historical error for each branch circuit and generates the error result. Considering the computing power limitations of the embedded control terminal in the power metering box and the practicality of the industrial site, the system takes reducing historical error as the optimization goal. It prioritizes correcting the weight parameters corresponding to the average power, actual average power and temperature difference on a periodic basis by means of moving average error correction or by retrieving offline calibration tables, and determines the updated weight parameters to be used in the next cycle.

[0068] Among them, the preset period can be a preset duration period; the historical error refers to the deviation between the prediction result and the actual measurement result within the period, and its physical meaning is the quantitative result of whether the current prediction model fits the actual power consumption characteristics of the circuit.

[0069] The system calculates the moving average error over multiple consecutive preset periods and fine-tunes the weight parameters step size based on the direction and magnitude of the average error; or, when environmental conditions change significantly, it directly retrieves a pre-set offline calibration table to match and update the weight parameters; in addition, in edge scenarios where the local centralized controller has strong computing power, objective optimization algorithms such as least squares can also be used as optional methods for parameter fitting.

[0070] To ensure the safety and stability of the system's allocation rules, the correction process is strictly constrained by the set upper and lower limits of the weights and the limit of the single weight adjustment range, so as to avoid prediction distortion caused by the violent fluctuation of weight parameters due to occasional extreme power consumption conditions. At the same time, the system supports stopping the automatic correction of weight parameters through the manual locking function, so as to allow independent intervention in specific fixed load circuits or scenarios where optimal parameters have been manually fixed.

[0071] Parameter updates are used to adapt each weight parameter to the specific characteristics of the loop. For example, if a loop is not sensitive to temperature changes, the weight parameter corresponding to the temperature difference will gradually decrease after multiple cycles of operation. If a loop is significantly affected by recent fluctuations, the weight parameter corresponding to the actual average power will gradually increase.

[0072] This invention iteratively updates the prediction model by incorporating historical errors after each preset cycle, enabling the prediction model to gradually adapt to the actual usage patterns of different loops, rather than having all loops share a single set of unchanging empirical parameters. In contrast, the fixed parameter method is prone to accumulating positive or negative prediction errors in scenarios with significant shifts between weekdays and weekends or large seasonal changes. This invention, through error-driven parameter updates, can continuously reduce such deviations.

[0073] The embodiments of the present invention can update the weight parameters based on historical errors, avoiding the accumulation of prediction bias caused by fixed parameters and ensuring the long-term accuracy of the allocation basis;

[0074] As an application example of this section, the local controller inside the box is installed at the inlet of the electricity metering box, and each intelligent control terminal can be installed at the outlet of each branch circuit. The hardware components inside the box can be connected by standardized electrical and communication wiring through terminal blocks. Newly collected ambient temperature, inlet voltage, terminal voltage, and real-time current are continuously sent to the data acquisition module. The load prediction module outputs predicted power according to the current allocation cycle. The priority calculation module obtains a comprehensive priority based on the basic importance level. The power allocation module forms the allowable power limit for each branch circuit, and then the control module sends the allowable power limit to the corresponding control terminal for execution. This implementation method provides a complete deployment path from data input and power prediction to quota output, which can be directly used in the actual control process of the electricity metering box.

[0075] The priority calculation module includes:

[0076] The load rate calculation unit is used to calculate the real-time load rate of each branch circuit based on the real-time current and the pre-acquired rated current of each branch circuit.

[0077] The priority calculation unit is used to multiply the basic importance level, real-time load rate, and quota tension by their respective preset weights and sum them to calculate the comprehensive priority; wherein, the quota tension is the ratio of the predicted power to the current allowable power limit.

[0078] The priority calculation module also includes:

[0079] The weight adjustment unit is used to increase the weight of the real-time load rate in the comprehensive priority calculation when the real-time load rate is detected to be greater than the preset ratio threshold and the real-time load rate at the current moment is greater than the real-time load rate at the previous moment.

[0080] The power distribution module includes:

[0081] The line condition assessment unit is used to calculate the difference between the incoming line voltage and the terminal voltage, and under effective sampling conditions, divide the difference by the real-time current to estimate the line condition parameters of each branch circuit. The line condition parameters are used as quota correction factors.

[0082] The quota allocation unit is used to allocate the upper limit of allowable power in full according to the predicted power when the sum of the predicted power of each branch circuit is less than or equal to the total incoming line capacity; and to generate the upper limit of allowable power based on the comprehensive priority and line status parameters when the sum of the predicted power of each branch circuit is greater than the total incoming line capacity.

[0083] When the quota allocation unit generates the allowable power limit:

[0084] When the overall priority is greater than the preset score threshold, the upper limit of the allowed power is allocated in full according to the corresponding predicted power.

[0085] When the overall priority is less than or equal to the preset score threshold, the remaining available power is calculated based on the difference between the total incoming line capacity and the sum of the allocated allowable power limits. Under the premise of ensuring the lower limit of the preset basic quota of the corresponding branch circuit, the line status parameters are used only as fine-tuning weights to allocate the remaining available power, so that the allowable power limit increment obtained by the branch circuit with larger line status parameters is limited.

[0086] In one implementation, after determining the predicted power of each branch circuit, the system further performs a comprehensive priority calculation on each branch circuit based on the real-time current, rated current, basic importance level, and current allowable power limit. When the sum of predicted power exceeds the total incoming line capacity, the system generates an allowable power limit based on the comprehensive priority and line status parameters. Through this process, the priority judgment no longer stops at the pre-set importance level, but simultaneously considers whether the current load of the circuit is too high, whether the existing quota is sufficient, and the branch loss situation.

[0087] Among them, rated current refers to the current value that the corresponding branch circuit is allowed to operate for a long time during the design; real-time load rate refers to the ratio of the current real-time current to the rated current; quota tension, according to the embodiment, is the ratio of predicted power to the current upper limit of allowed power, which is used to reflect the degree to which the load rate between the current expected demand of the circuit and the allocated capacity approaches the rated load.

[0088] This invention uses real-time load rate and quota tension to participate in scoring, extracts the dynamic change characteristics of the loop state, and transforms the problem of excessively large granularity of static level control into adjustment based on state changes.

[0089] This embodiment can achieve comprehensive priority calculation based on multi-factor scoring, avoiding the inability of high-priority circuits with sudden increases in real-time power supply demand to obtain the allowable power limit in a timely manner due to relying solely on fixed levels, thus making the allocation results and power supply order more consistent with the actual on-site conditions.

[0090] The system obtains the real-time current and the pre-obtained rated current of each branch circuit. Based on the ratio of real-time current to rated current, it calculates the load rate of each branch circuit to generate the real-time load rate. It also obtains the basic importance level, real-time load rate, and quota tension. Based on the preset weights of the three, it performs a weighted summation of each branch circuit to generate a comprehensive priority.

[0091] The real-time load rate can be expressed as: Its physical meaning is the first The degree to which the current load of each branch circuit is close to its rated limit; the quota tension can be expressed as Its physical meaning is the degree to which the predicted demand approaches the rated load relative to the current quota load rate. The larger the ratio, the more likely the circuit is to experience power shortage under the existing quota.

[0092] The overall priority can be calculated using the following scoring formula:

[0093]

[0094] in, In the above formula, the first digit represents the priority that the circuit should be guaranteed in the current allocation cycle. Overall priority of each circuit It is calculated in the following manner;

[0095] The basic importance level characterizes the artificially predetermined basic power supply sequence of circuits. The real-time current of the i-th branch loop With the pre-acquired first Rated current of each branch circuit The calculated real-time load rate, and the result from the first Predicted power of each branch loop With the Current maximum allowable power for each branch loop The calculated quota tension-related terms are multiplied by their respective weights. , , A weighted sum is then performed, with each weight used to balance the impact of basic importance level, real-time load rate, and quota tension on the final score; weights , , All are preset constants greater than 0, and must meet certain conditions during actual configuration. ;

[0096] As an example of a possible value, it can be set , , ; here This ratio is used to reflect the tightness of current forecast demand relative to existing quotas. When forecast power is close to or higher than the current quota, this ratio increases, indicating that the cycle needs to be prioritized for allocation. The allowable power ceiling of the previous cycle serves only as a reference for calculating the quota tightness of the current cycle, to eliminate cyclical dependencies between quotas. Specifically, the quota tightness of the current cycle is calculated according to... Calculation, where , For the previous cycle The maximum allowable power for each branch circuit. This represents the total incoming capacity for the current cycle. This represents the total incoming capacity of the previous cycle. Through the above capacity conversion, the quota tension level characterizes the degree of tension of current forecast demand relative to the reference quota adjusted based on current available capacity, rather than relative to historical quotas, while still avoiding circular dependencies between the current cycle quota and the current cycle priority. This applies when the system is in its initial power-on state, configuration changes, or the current branch circuit's allowable power limit. When the value is zero or invalid, the system will Set the rated power or preset basic quota of the corresponding circuit to ensure the engineering rationality of the comprehensive priority calculation in the initial allocation stage and effectively avoid the abnormality of division by zero calculation.

[0097] This invention can identify circuits that are of average importance but are now close to their rated load and have tight quotas by superimposing real-time load rate and quota tension. Taking air conditioning auxiliary circuits or general power circuits as examples, although their basic importance level may be lower than that of core protection circuits such as communication equipment, their overall priority will be increased when their load rate continues to rise during high-temperature periods and the predicted power is close to the current quota, thereby reducing the risk of sudden tripping.

[0098] This invention can calculate priorities based on basic importance level, real-time load rate and quota tension, avoiding the insufficient sensitivity of single-level evaluation to changes in operating conditions, and making the allocation results and power supply order more consistent with the actual on-site conditions.

[0099] The system acquires the real-time load rates of the current and previous time points and judges the load change trend of the branch loop based on the relationship between the two. When the real-time load rate is detected to be greater than the preset ratio threshold and the real-time load rate of the current time point is greater than the real-time load rate of the previous time point, the weight of the real-time load rate in the comprehensive priority calculation is increased. The increased weight does not exceed the preset weight upper limit. When the real-time load rate is lower than the preset recovery threshold, or the fluctuation of the real-time load rate is within the preset stable range and the duration reaches the preset hysteresis time, the weight is restored to the default weight.

[0100] The preset ratio threshold can be 85% to indicate that a branch loop is approaching its rated operating limit; if the real-time load rate at the current moment is greater than the real-time load rate at the previous moment, it means that the load of the loop is still increasing; the purpose of increasing the weight of the real-time load rate is to make the overall priority reflect its urgency more quickly when a loop is already under high load and continues to rise, rather than continuing to change slowly according to the conventional weight.

[0101] This invention focuses on real-time load rate factors during the high load rise phase, and can promptly identify branch loops with a sharp increase in instantaneous load rate, such as the start-up phase of electric equipment and the concentrated start-up phase of air conditioning compressors, transforming the problem of slow response under fixed weights into adjustments that are more in line with on-site changes.

[0102] This embodiment can adjust the weights based on the real-time load rate threshold and the upward trend, which avoids the high load loop score increasing too slowly and improves the allocation response speed when dealing with overload trends.

[0103] The system acquires the incoming line voltage, terminal voltage, and real-time current. Based on the difference between the incoming line voltage and the terminal voltage, it calculates the voltage drop for each branch circuit and, under effective sampling conditions, divides the difference by the real-time current to estimate the line status parameters of each branch circuit. It also acquires the predicted total power and total incoming line capacity of each branch circuit and determines whether the total power budget is limited based on their relationship. When the predicted total power of each branch circuit is greater than the total incoming line capacity, it generates the allowable power limit for each branch circuit based on the comprehensive priority and line status parameters.

[0104] The line status parameters can be expressed as follows: In the above formula, To comprehensively reflect the relationship between voltage drop and current from the incoming line to the terminal of the circuit, this line status parameter is only used as a correction factor for subsequent quota allocation and is not used as an accurate physical measurement value of line resistance. The incoming line voltage, which characterizes the voltage value at the power supply inlet of the metering box. The first character represents the actual voltage value obtained at the end of the circuit. Branch circuit terminal voltage The difference between them, divided by the first value representing the current electrical intensity flowing through the line in that circuit. Real-time current of each branch circuit Calculated;

[0105] It should be noted that in actual working conditions, if the first Each branch circuit is either off or under extremely low load, i.e., real-time current. When the value is zero or less than the system's preset effective detection lower limit, i.e., when the effective sampling conditions are not met, directly calculating the above formula will lead to an abnormal calculation where the denominator is zero. Therefore, this embodiment adds a boundary judgment before calculating the line state parameters. If the line status parameter approaches zero or equals zero, the line status parameter of the branch circuit is directly set to the average value of its historical status parameters or the preset safe default parameter value. The larger the line status parameter, the more likely the circuit is to generate line voltage drop and heat loss exceeding the preset safe threshold under the same current conditions.

[0106] In a system where loads are cut off only according to priority when total capacity is insufficient, this invention adds a constraint of line status parameters during allocation. This ensures that the allocation result considers not only the importance of the corresponding circuit but also which circuit is more likely to generate higher line losses when power is allocated to it. In scenarios where space is limited, such as power metering boxes, and wire heating needs to be monitored, this approach can reduce the excessive capacity occupied by high line resistance circuits when power supply is limited.

[0107] This embodiment uses line status parameters as an auxiliary constraint factor for quota allocation, avoiding the possibility of excessive local line load caused by simply allocating according to priority. As a supplement to the main control line, it helps to improve the problem of box heating caused by long-distance power supply.

[0108] Each branch circuit is classified according to a preset score threshold, generating high-priority circuits and ordinary circuits. For circuits with a comprehensive priority greater than the preset score threshold, the upper limit of allowable power is fully allocated according to the corresponding predicted power. For circuits with a comprehensive priority less than or equal to the preset score threshold, the remaining available power is calculated based on the difference between the total incoming line capacity and the sum of the allocated upper limit of allowable power. Then, the remaining available power is inversely allocated according to the line status parameters of each ordinary circuit, so that the upper limit of allowable power allocated to the branch circuit with the larger line status parameters is smaller.

[0109] The preset score threshold is used to distinguish between critical loops that require priority protection and ordinary loops that can participate in the remaining allocation. The preset score threshold can be statistically set based on the comprehensive priority score distribution of the system during historical full-load operation. For example, the preset score threshold can be preset to 0.6 or 60 points. Specifically, the comprehensive priority score samples of each branch loop during the historical full-load operation period of the system are statistically analyzed. After the score samples are sorted in ascending order, the sample at the preset percentile value is taken as the preset score threshold. The preset percentile value is between 60% and 80%, for example, the 70th percentile value. When there is no historical operation data for the system, the preset score threshold is the weighted sum of the score items corresponding to the basic importance level of each loop and the initial value.

[0110] Remaining available power refers to the portion of the total incoming line capacity remaining after deducting the portion already allocated to high-priority circuits according to the predicted power. For high-priority or safety-class circuits, because their overall priority exceeds a preset score threshold, they do not participate in subsequent restricted allocation based on line resistance, thus strictly guaranteeing their power supply needs. For ordinary circuits, to prevent the excessive compression of necessary loads at high-line-resistance remote locations, a minimum allocation limit of no less than a preset basic quota is set for them. The preset basic quota is determined according to a preset proportion of the rated power of the corresponding branch circuit, i.e. ,in For the first Rated power of each branch circuit This is a preset proportionality coefficient, with a value range of [value range missing]. For circuits that need to maintain a minimum operating state, the upper limit value is taken; the preset basic quota can also be the minimum continuous power consumption of the same type of day and time in history of the circuit; on the basis of ensuring the lower limit, for the incremental allocation of the remaining available power, the line status parameter is introduced as a fine-tuning weight: calculate the reciprocal of the line status parameter of each ordinary circuit. In order to avoid the reciprocal from being divided by zero due to the state parameter of a certain circuit approaching zero, a preset positive bias constant is added to the denominator of the line status parameter in actual calculation; the value of the preset positive bias constant can be set between 0.001 ohms and 0.01 ohms, for example, the value is 0.005 ohms in this embodiment;

[0111] Sum the reciprocals of all ordinary loops to obtain the total reciprocal reference value; divide the reciprocal of each ordinary loop by the total reciprocal reference value to obtain its corresponding allocation weight percentage.

[0112] Multiplying the weight percentage by the remaining available power yields the allocation increment of the ordinary circuit in the remaining capacity. This increment is then added to the preset basic quota of the corresponding circuit. If the final calculation result is lower than the preset basic quota, the preset basic quota is used as the actual allowable power limit for execution. For example, if there are two ordinary circuits with estimated line state parameters of 0.1 ohms and 0.2 ohms respectively, ignoring the bias constant, their reciprocals are 10 and 5 respectively, and the total reciprocal reference value is 15. In this case, the former receives 10 / 15 of the remaining available power, and the latter receives 5 / 15.

[0113] Its purpose is not to indiscriminately restrict a certain circuit, but to use the line resistance factor only as a fine adjustment to suppress the voltage drop and heat generation caused by the large power increment on the high line resistance line when the total capacity is limited, so as to avoid the necessary load at the far end being cut off due to direct disconnection.

[0114] This invention first protects the critical circuits, and then performs line resistance-related residual allocation on the ordinary circuits, so that the processing of ordinary circuits is no longer a uniform treatment with a fixed threshold, but a differentiated arrangement based on the line conditions.

[0115] This invention can allocate the upper limit of allowable power based on comprehensive priority and line status parameters, avoiding the excessive compression of some circuits caused by simply cutting off ordinary circuits. By introducing line status parameters to participate in the constraint and perform hierarchical allocation, it helps to reduce the uneven power supply caused by excessive compression of ordinary circuits, while reducing the heat generation of the enclosure and the overall line loss.

[0116] As an application example of this section, when the local controller in the box summarizes the predicted power of each branch circuit, if it finds that the total predicted power exceeds the total incoming line capacity, the system first calculates the real-time load rate and overall priority of each circuit, and then calculates the line status parameters based on the incoming line voltage, terminal voltage and real-time current; for critical circuits with scores higher than the set threshold, the power is directly allocated according to the predicted power; for the remaining circuits, the power is allocated according to the remaining available power and the size of the line status parameters, and the final allowable power limit is sent to each intelligent control terminal for execution; in this way, the power supply to critical loads can be maintained when the total capacity is tight, while taking into account the line loss of ordinary circuits.

[0117] The control module includes:

[0118] The alarm unit is used to generate a quota alarm command and send it to the local centralized controller when the actual power of the branch circuit reaches the preset warning threshold corresponding to the upper limit of the allowable power.

[0119] The quota adjustment unit receives quota alarm commands and calculates the total incoming power margin by deducting a preset delay compensation margin based on the difference between the total incoming capacity and the sum of the actual power of each branch circuit. When the total incoming power margin is greater than zero, the allowable power limit is added to the corresponding branch circuit that triggered the quota alarm command. When the total incoming power margin is less than or equal to zero, a rejection command is issued, causing the control terminal of the corresponding branch circuit to perform local current limiting operation when the actual power reaches the allowable power limit, if it has electronic current limiting capability, and outputs a trip control signal or alarm prompt when it does not have electronic current limiting capability.

[0120] The control module also includes:

[0121] The threshold adjustment unit is used to raise the warning threshold when the number of consecutive triggers of the warning threshold reaches a preset threshold, and the actual power does not exceed the upper limit of the allowable power.

[0122] The offline control unit is used to independently control the system by calling the last valid allowable power limit and basic importance level cached locally when an interruption in communication with the local centralized controller is detected, and to upload the actual power extreme value data and status change records during the offline period after communication is restored.

[0123] Also includes:

[0124] The off-center load monitoring module is used to calculate the average load rate based on the real-time load rate of each branch circuit, and generate an off-center load alarm message when the absolute value of the difference between the real-time load rate and the average load rate of a certain branch circuit is greater than a preset deviation threshold and the duration reaches a preset time threshold.

[0125] In one implementation, after receiving the upper limit of allowable power, the control terminal corresponding to each branch circuit does not immediately cut off before the quota is reached. Instead, it first issues a quota alarm when it approaches the upper limit of allowable power, and the local centralized controller determines whether there is still available margin in the current total incoming line. The local centralized controller can be a centralized management host deployed in the power distribution room or a transformer area management terminal. It is connected to the control module of each power metering box through a fieldbus or local area network. The remote cloud platform is only an optional data monitoring terminal and does not participate in real-time quota calculation.

[0126] If there is still power margin in the main incoming line, the allowable power limit is added to the corresponding branch circuit; if there is no power margin, the local centralized controller issues a rejection command, causing the corresponding branch circuit to perform local current limiting or tripping operation when the allowable power limit is reached. Through this process, the power interruption caused by the traditional system directly cutting off the power once it approaches the threshold can be avoided, and all branches can be prevented from competing for capacity and exceeding the capacity of the main incoming line.

[0127] Among them, the warning threshold refers to the preset alarm ratio corresponding to the upper limit of allowable power. This ratio can be configured on-site, for example, set within the range of 90%-98% of the power quota; the total incoming power margin refers to the difference between the total incoming capacity and the sum of the actual power of each branch circuit at the current time. Its physical meaning is how much available capacity is left at the incoming end at this moment; considering that there are sampling period delays and communication delays in the measurement and transmission of actual power, in order to compensate for the judgment deviation caused by the delayed data when the load changes rapidly, the total incoming power margin is calculated as follows: Calculation, where Total incoming line capacity Before the current moment The moving average of the sum of the actual power of each branch circuit within each sampling period. Pick , To allow for delayed compensation margin, according to Sure, The maximum rate of increase of load power is set based on historical operating data. It is the sum of the sampling period and the communication delay time; when the load rises rapidly, the delay compensation margin increases with the increase of the delay time, so that the quota addition judgment reserves the capacity margin in advance and avoids the lag or misjudgment based on the delay data.

[0128] This invention uses a local centralized controller to make a unified judgment on the total incoming line margin, transforming the local judgment of a single circuit into a coordinated processing that combines the margin of the entire enclosure.

[0129] This embodiment can adjust the allowable power limit based on quota alarms and total incoming power margin, avoiding unnecessary power outages caused by simple threshold cutoff, and solving the core problem that the power supply allocation strategy is fixed and lacks dynamic adjustment capability due to the lack of overall planning.

[0130] The actual power is compared and judged based on the preset warning threshold corresponding to the upper limit of allowable power; when the actual power is detected to reach the warning threshold, a quota alarm command is generated and sent to the local centralized controller; the total incoming line capacity and the sum of the actual power of each branch circuit are obtained, the total incoming line power margin is calculated based on the difference between the two, and it is determined whether to add an upper limit of allowable power based on the total incoming line power margin.

[0131] When the actual power reaches the warning threshold, it means that the branch circuit is close to the currently allocated power limit, but has not yet exceeded the limit. In this case, an alarm is sent first instead of immediately tripping the circuit breaker, which allows the local centralized controller time to reassess the situation. If the total incoming power margin is greater than zero, it means that the entire box still has remaining power supply capacity, and the allowable power limit can be added to the corresponding branch circuit that triggered the alarm. If the total incoming power margin is less than or equal to zero, it means that the total incoming capacity has no margin or is already strained. In this case, a rejection command is issued, so that the control terminal of the corresponding branch circuit will perform the corresponding limiting action when the actual power reaches the allowable power limit.

[0132] The control terminal has built-in hardware actuators such as intelligent miniature circuit breakers and measuring switches, and is equipped with a relay / circuit breaker control interface. When the control terminal of a branch circuit has electronic current limiting capability, it performs local current limiting operation; when it does not have electronic current limiting capability, it outputs a tripping control signal through the tripping mechanism or the relay / circuit breaker control interface to drive the external relay / circuit breaker actuator to perform a physical tripping action. The above processing is a local execution action of the control terminal, used to ensure that a single circuit does not exceed the allocated upper limit.

[0133] This invention uses early warning as a trigger condition for reallocation, so that early warning is not just a notification, but directly participates in subsequent quota processing. Taking the case of multiple circuits operating at the same time as an example, when a certain ordinary circuit is close to the preset early warning threshold, if the actual power consumption of other circuits is low, the local centralized controller can appropriately add quota to that circuit; conversely, if the total incoming line is close to full load, the ordinary circuit will be refused additional quota and will be controlled when the quota is reached.

[0134] This embodiment can be linked and adjusted based on quota alarms and total incoming line margin, avoiding unnecessary power outages caused by simple isolated threshold cutoffs, and significantly improving the dynamic flexibility of the allocation strategy.

[0135] The system retrieves the number of consecutive triggers of the warning threshold and determines whether the warning threshold needs to be adjusted based on the preset threshold. When the number of consecutive triggers of the warning threshold reaches the preset threshold, and the actual power within the corresponding time period does not exceed the allowable power limit, the warning threshold is increased. The system also detects the communication status with the local centralized controller. When a communication interruption is detected, the system calls the last valid allowable power limit and basic importance level cached locally for independent control. After communication is restored, the system uploads the actual power extreme value data and status change records during the offline period.

[0136] The preset threshold can be set to be set multiple times consecutively. As a specific example of adjustment, it can be adjusted appropriately within the range of 90%-98% according to the on-site configuration. The purpose is that if a certain circuit approaches the warning value multiple times but never actually reaches the upper limit of the allowable power, it means that the original warning threshold setting is lower than the safety requirements of the actual working conditions. Continuing to maintain a lower threshold will only increase the number of bus communications.

[0137] The conditions for determining communication interruption can be configured on-site, for example, set to determine when the communication heartbeat packet times out; the last valid allowable power limit refers to the most recent quota value stored in the local non-volatile memory that has been confirmed as executable by the local centralized controller; the basic importance level is used to maintain the basic control order between loops during offline periods;

[0138] In response to the problem of losing control after communication interruption or frequent alarms caused by long-term use of fixed warning thresholds, this invention reduces invalid alarms by adjusting the threshold and ensures that the system can continue to operate based on the last valid quota during communication anomalies through local caching.

[0139] This embodiment can achieve operation and maintenance based on the adjustment of the early warning threshold and local offline control. The early warning threshold self-adaptation and offline takeover mechanism effectively reduce the frequent disturbances to the system caused by local load fluctuations and communication anomalies, and enhance the overall operational stability.

[0140] Get the real-time load rate of each branch circuit, and average the real-time load rates of all branch circuits to generate the average load rate; get the absolute value of the difference between the real-time load rate and the average load rate of a certain branch circuit, and make a continuous judgment based on the preset deviation threshold and the preset time threshold. When the absolute value of the difference is greater than the preset deviation threshold and the duration reaches the preset time threshold, generate an off-load alarm message.

[0141] The average load rate is used to reflect the general level of the load rate of each circuit in the entire enclosure. The deviation threshold and time threshold can be configured according to the site conditions. For example, the deviation threshold can be 20%-40%, and the time threshold can be 3-10 minutes to distinguish between short-term fluctuations and continuous off-center load. If the real-time load rate of a certain circuit is significantly higher or lower than the average level of the entire enclosure for a long period of time, it may reflect that there is an off-center load problem in that circuit. The off-center load here can correspond to uneven power consumption between branch circuits, and can also be used as a reference for troubleshooting circuit load anomalies.

[0142] Compared to methods that only monitor single-loop over-limit status without joint analysis of global load distribution characteristics, this invention can identify loops that, although not over-limit, have significantly deviated from the overall state by comparing the single-loop load rate with the average load rate of the entire enclosure.

[0143] The off-center load monitoring mechanism provided in this embodiment serves as an auxiliary safety redundancy means for quota allocation. It can promptly alert to the edge operation status of long-term imbalance between circuits, and further enhance the overall power supply reliability of the enclosure in conjunction with the local control strategy.

[0144] In this embodiment, each intelligent control terminal continuously monitors the actual power of its circuit during operation. When the warning threshold of the allowable power limit is reached, a quota alarm is sent to the local centralized controller. The local centralized controller calculates whether there is additional capacity based on the difference between the total incoming line capacity and the sum of the actual power of each circuit, and returns an additional quota instruction or a rejection instruction to the corresponding terminal. If a terminal triggers an alarm multiple times but never exceeds the limit, its local alarm threshold can be increased. If communication is interrupted, the terminal calls the last valid allowable power limit and basic importance level in the local cache to continue executing control.

[0145] At the same time, the local centralized controller continuously monitors the real-time load rate of each branch circuit. If it finds that the deviation of a circuit from the average load rate exceeds the preset deviation threshold and continues to reach the preset time threshold, it outputs an off-load alarm message for display and recording by the local centralized controller or the optional remote platform of the distribution area.

[0146] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.

Claims

1. A power distribution control system for a multi-branch circuit of an electricity metering box, characterized in that, The system includes a local controller installed inside the energy metering box, and branch sampling control terminals connected to the local controller via communication terminals. The energy metering box also includes an incoming line sampling module for collecting incoming line parameters, and branch measurement and control units for independent measurement and control of each circuit. The local controller includes: The data acquisition module is used to collect real-time ambient temperature and incoming voltage at the power metering box, and to collect real-time current and terminal voltage at the outgoing end through the branch sampling control terminal corresponding to each branch circuit; to obtain the total incoming capacity pre-configured or determined by the rated parameters on the incoming side, as well as the historical power consumption data of each branch circuit stored locally or issued by the upper-level control node; and to directly obtain the actual active power of each branch circuit by the metering chip, or to calculate the actual power of each branch circuit based on the real-time current, the terminal voltage, and the power factor. The load forecasting module is used to predict the power of each branch circuit based on the historical electricity consumption data and the real-time ambient temperature, and obtain the predicted power of each branch circuit. The priority calculation module is used to obtain the pre-configured basic importance level of each branch circuit and determine the current allowable power limit. The current allowable power limit is based on the preset basic quota or the rated power of the corresponding circuit in the initial state or when the quota is invalid. In the normal operation cycle, the allowable power limit of the previous cycle is extracted and converted according to the ratio of the current total incoming capacity to the total incoming capacity of the previous cycle, and is only used as a reference for quota tension calculation. The module calculates the comprehensive priority of each branch circuit based on the real-time current, the predicted power, the current allowable power limit, and the basic importance level. The power allocation module is used to generate the allowable power limit for each branch circuit based on the predicted power, the overall priority, and the total incoming line capacity. The control module is used to send the allowable power limit to the control terminal corresponding to each branch circuit, and to perform power control on each branch circuit according to the allowable power limit and the real-time current, as well as to communicate with the external local centralized controller.

2. The power distribution control system for a multi-branch circuit of an energy metering box according to claim 1, characterized in that, The load forecasting module includes: The basic prediction unit is used to obtain the average power of each branch circuit during the corresponding time period of the same type of historical day, and the actual average power during the preset time period before the current time, based on the historical electricity consumption data. A temperature correction unit is used to obtain the temperature difference between the real-time ambient temperature and the preset reference temperature, and multiply the temperature difference, the average power and the actual average power by preset corresponding weight parameters and sum them up. The weight parameter corresponding to the temperature difference includes the equivalent conversion dimension of power and temperature, and the predicted power is calculated.

3. The power distribution control system for a multi-branch circuit of an energy metering box according to claim 2, characterized in that, The load forecasting module also includes: The parameter update unit is used to calculate the historical error between the predicted power and the actual power at the end of the preset period, and to correct the weight parameters corresponding to the average power, the actual average power and the temperature difference periodically by means of moving average error correction or by retrieving an offline calibration table; wherein the correction process is constrained by the set upper and lower limits of the weight and the limit of the single weight adjustment range, and supports stopping the automatic correction of the weight parameters by means of a manual locking function.

4. The power distribution control system for a multi-branch circuit power metering box according to claim 1, characterized in that, The priority calculation module includes: The load rate calculation unit is used to calculate the real-time load rate of each branch circuit based on the real-time current and the pre-acquired rated current of each branch circuit. The priority calculation unit is used to multiply the basic importance level, the real-time load rate, and the quota tension by their respective preset weights and sum them to calculate the comprehensive priority; wherein, the quota tension is the ratio of the predicted power to the current allowable power limit.

5. A power distribution control system for a multi-branch circuit power metering box according to claim 4, characterized in that, The priority calculation module also includes: The weight adjustment unit is used to increase the weight of the real-time load rate in the comprehensive priority calculation when it is detected that the real-time load rate is greater than a preset ratio threshold and the real-time load rate at the current moment is greater than the real-time load rate at the previous moment; wherein the increased weight does not exceed a preset weight upper limit; when the real-time load rate is lower than a preset recovery threshold, or when the fluctuation of the real-time load rate is within a preset stable range and the duration reaches a preset hysteresis time, the weight is restored to the default weight.

6. The power distribution control system for a multi-branch circuit power metering box according to claim 1, characterized in that, The power distribution module includes: The line status assessment unit is used to calculate the difference between the incoming line voltage and the terminal voltage, and under effective sampling conditions, divide the difference by the real-time current to estimate the line status parameters of each branch circuit. The line status parameters are used as quota correction factors. The quota allocation unit is used to allocate the upper limit of allowable power in full according to the predicted power when the sum of the predicted power of each branch circuit is less than or equal to the total incoming line capacity; and to generate the upper limit of allowable power according to the comprehensive priority and the line status parameters when the sum of the predicted power of each branch circuit is greater than the total incoming line capacity.

7. A power distribution control system for a multi-branch circuit power metering box according to claim 6, characterized in that, When the quota allocation unit generates the allowed power limit: When the overall priority is greater than the preset score threshold, the upper limit of the allowed power is fully allocated according to the corresponding predicted power; When the overall priority is less than or equal to the preset score threshold, the remaining available power is calculated based on the difference between the total incoming line capacity and the sum of the allocated allowable power limits. Under the premise of ensuring the lower limit of the preset basic quota of the corresponding branch circuit, the line status parameters are used only as fine-tuning weights to allocate the remaining available power, so that the allowable power limit increment obtained by the branch circuit with larger line status parameters is limited.

8. A power distribution control system for a multi-branch circuit power metering box according to claim 1, characterized in that, The control module includes: An alarm unit is used to generate a quota alarm command and send it to the local centralized controller when the actual power of the branch circuit reaches a preset warning threshold corresponding to the upper limit of the allowable power. The quota adjustment unit is used to receive the quota alarm command and calculate the total incoming power margin based on the difference between the total incoming capacity and the sum of the actual power of each branch circuit, after deducting a preset delay compensation margin. When the total incoming power margin is greater than zero, an allowable power limit is added to the corresponding branch circuit that triggered the quota alarm command. When the total incoming power margin is less than or equal to zero, a rejection command is issued, causing the control terminal of the corresponding branch circuit to perform local current limiting operation when the actual power reaches the allowable power limit, if it has electronic current limiting capability, and output a trip control signal or alarm prompt when it does not have electronic current limiting capability.

9. A power distribution control system for a multi-branch circuit power metering box according to claim 8, characterized in that, The control module also includes: A threshold adjustment unit is used to increase the warning threshold when the number of times the warning threshold is triggered consecutively reaches a preset number threshold, and the actual power does not exceed the allowable power limit. The offline control unit is used to independently control the power limit that was last valid in the local cache and the basic importance level when an interruption in communication with the local centralized controller is detected, and to upload the actual power extreme value data and status change records during the offline period after communication is restored.

10. A power distribution control system for a multi-branch circuit of an energy metering box according to claim 4, characterized in that, Also includes: The off-center load monitoring module is used to calculate the average load rate based on the real-time load rate of each branch circuit, and generate an off-center load alarm message when the absolute value of the difference between the real-time load rate and the average load rate of a certain branch circuit is greater than a preset deviation threshold and the duration reaches a preset time threshold.

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