A method and system for adaptive interconnection and backup power supply of distribution radio areas

Abstract

This invention discloses an adaptive interconnection and backup power transfer method and system for distribution transformer substations. The method includes: real-time acquisition of operating condition signals from multiple distribution transformer substations, comparing them with multiple criteria to determine the fault status of each substation; classifying substations into faulty and normal substations based on the fault status, and performing dual matching of the remaining capacity of the normal substations and the load capacity of the faulty substations, as well as the load rate of the normal substations and a preset maximum load rate, to generate a matching result. If the matching result is satisfactory, disconnecting the power supply to the faulty substation and connecting the power supply circuits of the normal and faulty substations to achieve interconnection and backup power transfer. Continuously comparing the voltage signal of the faulty substation after power transfer with a preset recovery voltage threshold, and restoring independent power supply to the faulty substation when the threshold requirement is met for a preset number of consecutive preset times and the duration reaches a preset time threshold. This invention can solve the problems of extremely poor timeliness of power transfer in distribution transformer substations, significant power outage losses, and insufficient environmental adaptability and automation.

Description

Technical Field

[0001] This invention relates to the field of power supply control technology for distribution substations, and in particular to a method and system for adaptive interconnection and backup power transfer in distribution substations. Background Technology

[0002] Transmission line faults are a common and persistent problem causing unstable power supply in distribution transformer areas. They can easily lead to power outages, affecting residents' daily lives, disrupting agricultural irrigation and township enterprise production, and causing direct economic losses. Currently, the requirements for power supply reliability are continuously increasing, demanding that distribution transformer areas have the capability for rapid outdoor installation, strong anti-interference capabilities, and second-level backup and switching capabilities, reducing power outage duration from hours to seconds.

[0003] The existing distribution area transfer is entirely based on the traditional manual operation mode. After the line fails and the power goes out, the maintenance personnel receive the fault notification, rush to the site for investigation and assessment, formulate the transfer power supply plan, and then manually operate the distribution equipment to complete the transfer of the area load. This method has the following defects: (1) It relies on manual on-site arrival, on-site judgment and manual operation throughout the process. The process is complicated and time-consuming. It takes hours to restore the power supply. The power restoration efficiency is difficult to meet the electricity demand. (2) The power outage loss is prominent: Long-term power outages not only disrupt the normal life of residents, but also interrupt agricultural irrigation and continuous production of enterprises. It is easy to cause economic losses such as crop damage, production delays and product quality damage. (3) There is a lack of special devices that can be quickly installed in outdoor scenarios. The operation is significantly restricted by weather and regional conditions. At the same time, there is no special anti-interference configuration and automatic switching function. The operation stability is poor and it is completely dependent on manual intervention.

[0004] There are currently no effective solutions to the problems of extremely poor power transfer time, significant power outage losses, and insufficient environmental adaptability and automation in related technologies. Summary of the Invention

[0005] The present invention provides a method and system for adaptive interconnection and backup power transfer of distribution substations, which at least solves the problems of extremely poor power transfer time, significant power outage losses, and insufficient environmental adaptability and automation in related technologies.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] The first aspect of this invention provides an adaptive interconnection and backup power transfer method for distribution substations. The method includes: comparing real-time collected operating condition signals of multiple distribution substations with multiple criteria to determine the fault status of each distribution substation; wherein the criteria include: a no-voltage criterion and a no-overcurrent criterion; distinguishing between faulty substations and normal substations based on the fault status, and performing dual matching between the remaining capacity of the normal substation and the load capacity of the faulty substation, and between the load rate of the normal substation and a preset maximum load rate, to generate a matching result; wherein the remaining capacity is calculated based on the rated capacity, real-time apparent power, and safety margin coefficient of the normal substation; if the matching result is qualified, disconnecting the power supply of the faulty substation and connecting the power supply circuits of the normal substation and the faulty substation to achieve interconnection and backup power transfer; continuously comparing the voltage signal of the faulty substation after the power transfer is completed with a preset recovery voltage threshold; if the preset recovery voltage threshold is met for a preset number of consecutive times and the duration reaches a preset time threshold, then the faulty substation is restored to independent power supply.

[0008] Preferably, the operating condition signals of multiple distribution substations collected in real time are compared with multiple criteria to determine the fault status of each distribution substation. This includes: collecting operating condition signals of multiple distribution substations in real time; wherein the operating condition signals include: voltage signals, current signals, switch position signals, and rated capacity signals; comparing the operating condition signals corresponding to each distribution substation with a no-voltage criterion and a no-overcurrent criterion; if the distribution substation simultaneously meets the no-voltage criterion and the no-overcurrent criterion, and the duration meets a first preset time threshold, it is confirmed that the distribution substation has a power outage fault.

[0009] Preferably, the operating condition signals corresponding to each of the distribution transformer substations are compared with the no-voltage criterion and the no-overcurrent criterion, respectively, including: performing time-frequency domain transformation processing on the voltage and current signals of each of the distribution transformer substations to extract the fundamental voltage and fundamental current waves, and obtaining the corresponding effective voltage and effective current values; comparing each effective voltage value with the no-voltage criterion to obtain a corresponding first judgment result; wherein, the no-voltage criterion is that the effective voltage value is less than or equal to a first preset multiple of the rated voltage; the range of the first preset multiple is 0.25 to 0.35; comparing each effective current value with the no-overcurrent criterion to obtain a corresponding second judgment result; wherein, the no-overcurrent criterion is that the effective current value is less than or equal to a second preset multiple of the set current; the range of the second preset multiple is 1.02 to 1.08.

[0010] Preferably, based on the fault condition, faulty distribution areas and normal distribution areas are distinguished, and the remaining capacity of the normal distribution area is matched with the load capacity of the faulty distribution area, and the load rate of the normal distribution area is matched with a preset maximum load rate to generate a matching result. This includes: if the fault condition of the distribution area is a power outage, the distribution area is determined to be a faulty distribution area; otherwise, it is a normal distribution area; the remaining capacity of the normal distribution area is matched with the load capacity of the faulty distribution area to obtain a first matching result; wherein, the load capacity is calculated based on the real-time total active power and power factor of the faulty distribution area before the power outage; the load rate of the normal distribution area is matched with a preset maximum load rate to generate a second matching result.

[0011] Preferably, the formula for calculating the remaining capacity of the normal transformer area is: ; ;in, This represents the remaining capacity of the normal distribution area; This is the rated capacity of a normal distribution area; This represents the real-time apparent power of a normal distribution area. This is the safety margin factor, with a value ranging from 1.05 to 1.2; This represents the total active power of a normal transformer substation. This represents the power factor for a normal distribution area.

[0012] Preferably, if the matching result is qualified, the power supply to the faulty transformer area is disconnected, and the power supply circuit between the normal transformer area and the faulty transformer area is connected to achieve interconnection and backup power transfer. This includes: if the remaining capacity of the normal transformer area matches the load capacity of the faulty transformer area, and the load rate of the normal transformer area matches the preset maximum load rate, then the matching result is qualified; the control host issues a power transfer control command to the normal transformer area and the faulty transformer area; based on the power transfer control command, the outgoing circuit breaker of the faulty transformer area is opened sequentially, and the connecting line circuit breaker between the normal transformer area and the faulty transformer area is closed, so that the power supply to the faulty transformer area is disconnected, and the power supply circuit between the normal transformer area and the faulty transformer area is connected to achieve interconnection and backup power transfer.

[0013] Preferably, the voltage signal of the faulty transformer area after the power transfer is completed is continuously compared with a preset recovery voltage threshold. If the preset recovery voltage threshold is met for a preset number of consecutive times and the duration reaches a preset time threshold, then the faulty transformer area is restored to independent power supply. This includes: real-time acquisition of the voltage signal of the faulty transformer area after the power transfer, preprocessing the voltage signal, and calculating the effective voltage value; wherein the preprocessing includes filtering; continuously comparing the effective voltage value with the preset recovery voltage threshold; wherein the preset recovery voltage threshold is a third preset multiple of the rated voltage; the range of the third preset multiple is 0.70 to 0.80. If the preset recovery voltage threshold is met for a preset number of consecutive times and the duration reaches a preset time threshold, then it is determined that the faulty transformer area has been restored to power supply, and a power supply restoration confirmation signal is generated; wherein the range of the preset time threshold is 250ms to 350ms; based on the power supply restoration confirmation signal, the faulty transformer area is restored to independent power supply.

[0014] Preferably, the voltage signal of the faulty transformer area after power transfer is acquired in real time, the voltage signal is preprocessed, and the effective voltage value is calculated, including: acquiring the voltage signal of the faulty transformer area after power transfer in real time; filtering the voltage signal to remove noise interference; performing time-frequency domain transformation on the filtered voltage signal to extract the fundamental voltage component and obtain the effective voltage value.

[0015] Preferably, restoring independent power supply to the faulty transformer area based on the power restoration confirmation signal includes: opening the circuit breaker of the connecting line between the normal transformer area and the faulty transformer area based on the power restoration confirmation signal; and closing the outgoing circuit breaker of the faulty transformer area after confirming that the connecting line circuit breaker is in place, so that the faulty transformer area is restored to independent power supply.

[0016] A second aspect of the present invention provides an adaptive interconnection and backup power transfer system for distribution transformer substations. The system includes: a signal acquisition module, a control host, and an execution module. The signal acquisition module is used to acquire operating condition signals from multiple distribution transformer substations in real time and send them to the control host. The control host is used to receive the operating condition signals and compare them with multiple criteria to determine the fault status of each distribution transformer substation. The criteria include: a no-voltage criterion and a no-overcurrent criterion. Based on the fault status, faulty substations and normal substations are distinguished, and the remaining capacity of the normal substations is matched with the load capacity of the faulty substations, and the load rate of the normal substations is matched with a preset maximum load rate to generate a matching result. The remaining capacity is calculated based on the rated capacity, real-time apparent power, and safety margin factor of the normal distribution area. If the matching result is qualified, a power transfer control signal is sent to the execution module. The voltage signal of the faulty distribution area after the power transfer is completed is continuously compared with a preset recovery voltage threshold. If the preset recovery voltage threshold is met for a preset number of consecutive times and the duration reaches a preset time threshold, it is determined that the faulty distribution area has been restored to power supply, and a power restoration independent power supply signal is sent to the execution module. The execution module is used to disconnect the power supply of the faulty distribution area based on the power transfer control signal, and connect the power supply circuit between the normal distribution area and the faulty distribution area to realize interconnection, backup, and power transfer. Based on the power restoration independent power supply signal, the faulty distribution area is restored to independent power supply.

[0017] Compared with the prior art, the above-described technical solution of the present invention has the following advantages:

[0018] This invention provides a method and system for adaptive interconnection and backup power transfer in distribution substations. It collects real-time operating condition signals from the distribution substations and uses no-voltage and no-overcurrent criteria to determine substation faults. Then, it calculates the remaining capacity of normal substations based on rated capacity, real-time apparent power, and safety margin coefficient. A dual matching verification is performed on the substation load capacity and actual load rate. Once the matching is successful, the power supply to the faulty substation is directly disconnected, and the power supply circuit is connected to complete the power transfer. Subsequently, the voltage of the faulty substation is continuously compared with the recovery voltage threshold. Independent power supply is restored only after a preset number of comparisons and duration. The entire process relies on signal acquisition and preset criteria to automatically complete fault judgment, load matching, and switch switching, eliminating the need for manual on-site inspection, calculation, and manual operation. This solves the problems of poor power transfer timeliness and low automation. Simultaneously, by accurately calculating the remaining capacity and applying dual constraints, it can reasonably match the transferred load, avoid substation overload causing new faults, and accurately control the timing of power restoration, effectively shortening power outage time and reducing power loss caused by faults. Attached Figure Description

[0019] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other embodiments based on these drawings without creative effort.

[0020] Figure 1 This is a schematic flowchart of a distribution radio area adaptive interconnection backup and transfer method according to an embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the architecture of a distribution radio area adaptive interconnection backup and transfer system according to an embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the signal acquisition module according to an embodiment of the present invention.

[0023] Figure 4 This is a schematic diagram of the structure of an electronic device created by the present invention. Detailed Implementation

[0024] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0025] To address the issues of extremely poor power transfer time, significant power outage losses, and insufficient environmental adaptability and automation in related technologies, the embodiments of this invention provide a method and system for adaptive interconnection and backup power transfer of distribution substations.

[0026] Among them, such as Figure 1 As shown, the embodiment of the present invention provides a method for adaptive interconnection and backup power transfer of distribution radio areas, which includes the following steps S1 to S4.

[0027] Step S1 involves comparing the real-time collected operating condition signals of multiple distribution transformer substations with multiple criteria to determine the fault status of each distribution transformer substation; the criteria include: no-voltage criterion and no-overcurrent criterion.

[0028] Step S2: Based on the fault situation, distinguish between faulty transformer areas and normal transformer areas, and perform dual matching between the remaining capacity of normal transformer areas and the load capacity of faulty transformer areas, and between the load rate of normal transformer areas and the preset maximum load rate, to generate matching results; wherein, the remaining capacity is calculated based on the rated capacity of normal transformer areas, real-time apparent power and safety margin factor.

[0029] Step S3: If the matching result is qualified, disconnect the power supply of the faulty transformer area and connect the power supply circuit between the normal transformer area and the faulty transformer area to realize interconnection, backup and transfer of power supply.

[0030] Step S4: The voltage signal of the faulty transformer area after the power transfer is completed is continuously compared with the preset recovery voltage threshold. If the preset recovery voltage threshold is met for a preset number of consecutive preset times and the duration reaches the preset time threshold, the faulty transformer area is restored to independent power supply.

[0031] A distribution substation is an independent power supply unit at the end of a low-voltage distribution network that faces end users. It typically includes a signal acquisition module and an execution module.

[0032] The signal acquisition module is responsible for collecting the operating condition signals of the distribution substation. The execution module includes outgoing circuit breakers, tie circuit breakers, and a drive module, all of which are connected to the control command link via a signal transmission link. After preprocessing the operating condition signals, the signal acquisition module transmits them to the control host. The control host analyzes the signals and issues commands to drive the execution module to perform actions, thereby controlling the on / off state of the power supply circuit.

[0033] Operating condition signals may include voltage signals, current signals, switch position signals, rated capacity signals, active power signals, and power factor, etc. These signals are downsampled by the voltage and current transformers of the signal acquisition module, and after signal conditioning, filtering, and analog-to-digital conversion, are acquired in real-time at high frequency via short-range wireless communication.

[0034] The no-voltage criterion is a voltage determination rule used to identify the power outage state of a transformer area. It can be set to the effective value of the real-time voltage of the transformer area being 20% ​​to 40% lower than the rated voltage.

[0035] The no-overcurrent criterion is a current judgment rule used to eliminate abnormal current interference in the transformer area. It can be set to the effective value of the real-time current in the transformer area being less than 1.0 to 1.1 times the circuit breaker setting current.

[0036] The fault conditions mainly include power outage faults, as well as power interruption faults caused by short circuits and overloads; if the operating condition signal of the distribution transformer area simultaneously meets the no-voltage criterion and the no-overcurrent criterion, and after continuous repeated sampling verification for 3 to 5 times, and the qualified state lasts for 80 to 120 milliseconds, it is determined to be a real fault after collaborative verification.

[0037] Step S1 of the method provided in the embodiments of the present invention, by adopting the collaborative comparison of no-pressure and no-overcurrent dual criteria, and superimposing the fault identification logic of multiple sampling and duration dual confirmation, can avoid the defects of single criteria being easily affected by signal interference, reduce the probability of fault misjudgment and missed judgment, and improve the accuracy and reliability of fault identification.

[0038] The remaining capacity of a normal distribution area refers to the maximum apparent power that a normal distribution area can safely carry the load of a faulty distribution area after deducting the current actual load. It is calculated by subtracting the real-time apparent power and the safety margin factor from the rated capacity of the normal distribution area.

[0039] The safety margin factor is a correction factor used when calculating the remaining capacity that a normal distribution substation can support, to reserve safety redundancy for uncertainties such as short-term load fluctuations, equipment aging, and line losses. The safety margin factor needs to balance the safety of power transfer with the utilization rate of distribution resources: a value that is too small may lead to overload after power transfer due to insufficient coverage of additional loads, while a value that is too large will excessively compress the supportable capacity and reduce the success rate of power transfer matching. Considering the typical operating characteristics of low-voltage distribution substations, its value is set between 1.05 and 1.2 to balance safety redundancy and resource utilization efficiency.

[0040] The load capacity of a faulty transformer area refers to the total apparent power consumed in real time before the power outage. It is calculated by collecting the total active power in real time before the power outage and combining it with the power factor of the low-voltage transformer area, which is between 0.8 and 0.9.

[0041] The load factor of a normal distribution area refers to the proportion of the current real-time load of a normal distribution area to its rated power supply capacity. It is calculated by dividing the real-time apparent power by the rated capacity of the distribution area and then multiplying by 100%.

[0042] The preset maximum load rate refers to the maximum safe load ratio that a normal distribution area can achieve when undertaking power transfer tasks. It is selected based on the parameters of the transformer in the distribution area, the current carrying capacity of the line, and the aging status of the equipment, and the value ranges from 60% to 80%.

[0043] After distinguishing between faulty and normal distribution areas based on the fault situation, first calculate the remaining capacity of the normal distribution area and compare it with the load capacity of the faulty distribution area. The remaining capacity must not be lower than the load capacity of the faulty distribution area. Then calculate the actual load rate of the normal distribution area and compare it with the preset maximum load rate. The actual load rate must not be higher than the preset maximum load rate. If both checks are met, a matching result is generated. If either check is not met, a matching result is generated.

[0044] Step S2 of the method provided in the embodiments of the present invention constructs a dual constraint matching system of remaining capacity and load capacity, actual load rate and maximum load rate, and dynamically verifies power supply adaptability based on real-time parameters. This enables accurate calculation of the normal distribution area's power transfer carrying capacity, avoids the risk of power transfer overload from both capacity adaptability and load safety dimensions, and ensures stable interconnection power transfer without secondary faults.

[0045] If the matching result is qualified, the control host will first send a trip command to the outgoing circuit breaker of the faulty transformer area. After receiving the feedback that the trip was successful, it will send a closing command to the tie circuit breaker. After receiving the feedback that the closing was successful, the interconnection backup power supply is completed, which disconnects the power supply to the faulty transformer area and connects the power supply circuit between the normal transformer area and the faulty transformer area.

[0046] Step S3 of the method provided in the embodiments of the present invention achieves fault circuit isolation and rapid connection of power supply circuit by adopting closed-loop step-by-step switching control logic of opening-feedback-closing. It can achieve power outage restoration time without manual on-site operation, greatly shortening the power outage time and compressing the traditional hour-level power outage to the second level, ensuring the stability of power supply for residential life and small-scale production.

[0047] The preset recovery voltage threshold can be selected according to the low-voltage power supply quality standard, and the value range is 70% to 85% of the rated voltage.

[0048] The number of consecutive preset times can be selected to balance recognition accuracy and response speed, with a value range of 3 to 6 times.

[0049] The preset time threshold can be used to filter out interference signals caused by instantaneous voltage rise, with a value range of 200 milliseconds to 500 milliseconds.

[0050] After the power transfer is completed, the voltage signal of the faulty transformer area is continuously collected at high frequency and compared with the preset recovery voltage threshold one by one. If the voltage meets the standard for 3 to 6 consecutive samplings and the standard status lasts for 200 to 500 milliseconds, it is determined that the power supply of the faulty transformer area has been fully restored. The communication control host first issues a tripping command to the communication circuit breaker, and after receiving feedback, issues a closing command to the outgoing circuit breaker of the faulty transformer area to restore independent power supply to both transformer areas.

[0051] Step S4 of the method provided in the embodiments of the present invention accurately identifies the power supply recovery status by adopting a dual power supply recovery judgment logic of continuous multiple sampling verification and duration verification. This can avoid erroneous recovery operations caused by instantaneous voltage fluctuations and signal interference, ensure smooth and orderly power supply switching, prevent repeated switching from damaging equipment, and improve system operation stability.

[0052] The present invention provides a method for adaptive interconnection and backup power transfer of distribution substations. This method collects the operating condition signals of the distribution substations in real time, and determines the substation fault by combining the no-voltage criterion and the no-overcurrent criterion. Then, it calculates the remaining capacity of the normal substations based on the rated capacity, real-time apparent power and safety margin coefficient. It performs dual matching verification on the substation load capacity and actual load rate. After the matching meets the standard, it directly disconnects the power supply of the faulty substation and connects the power supply circuit to complete the power transfer. Subsequently, it continuously compares the voltage of the faulty substation with the recovery voltage threshold. After reaching the preset number of comparisons and duration, it restores independent power supply.

[0053] Furthermore, the method provided in the embodiments of the present invention automatically completes fault judgment, load matching and switch switching based on signal acquisition and preset criteria throughout the entire process, without the need for manual on-site inspection, calculation and manual operation, thus solving the problems of poor power transfer timeliness and low level of automation; at the same time, by accurately calculating the remaining capacity and applying dual condition constraints, it can reasonably match the transferred load, avoid the overload of the transformer area causing new faults, and accurately control the timing of power restoration, effectively shortening the power outage time and reducing the power outage losses caused by faults.

[0054] Furthermore, step S1 provided in the embodiment of the present invention preferably includes: real-time acquisition of operating condition signals of multiple distribution substations; wherein, the operating condition signals include: voltage signals, current signals, switch position signals and rated capacity signals; comparing the operating condition signals corresponding to each distribution substation with the no-voltage criterion and the no-overcurrent criterion respectively; if the distribution substation simultaneously meets the no-voltage criterion and the no-overcurrent criterion, and the duration meets the first preset time threshold, it is confirmed that there is a power outage fault in the distribution substation.

[0055] Voltage signals are acquired by voltage transformers within the signal acquisition module, current signals are acquired by current transformers within the signal acquisition module, switch position signals are acquired by auxiliary contacts or position sensors within the signal acquisition module, and rated capacity signals are inherent parameters of the transformer area, pre-stored in the non-volatile storage unit of the signal acquisition module and directly read by the acquisition module.

[0056] The first preset time threshold is the duration confirmation threshold for fault determination, with a value range of 80ms to 120ms. It can be adjusted based on the load fluctuation characteristics of the distribution area and the level of on-site signal interference. For distribution areas with gentle load fluctuations and stable signal environment, a lower value close to 80ms can be selected, while for distribution areas with high anti-interference requirements and susceptible to instantaneous signal interference, a higher value close to 120ms can be selected.

[0057] The method provided by the embodiments of the present invention, by adopting the collaborative verification of no-pressure criterion and no-overcurrent criterion, and combining continuous sampling verification and confirmation of the first preset time threshold, can effectively avoid misjudgment and omission of single criterion, and improve the accuracy and anti-interference capability of fault identification.

[0058] Furthermore, the method provided in the embodiments of the present invention, which compares the operating condition signals corresponding to each distribution substation with the no-voltage criterion and the no-overcurrent criterion respectively, preferably includes: performing time-frequency domain transformation processing on the voltage and current signals of each distribution substation to extract the voltage fundamental and current fundamental frequencies, and obtaining the corresponding effective voltage and effective current values; comparing each effective voltage value with the no-voltage criterion to obtain the corresponding first judgment result; wherein, the no-voltage criterion is that the effective voltage value is less than or equal to a first preset multiple of the rated voltage; the range of the first preset multiple is 0.25 to 0.35; comparing each effective current value with the no-overcurrent criterion to obtain the corresponding second judgment result; wherein, the no-overcurrent criterion is that the effective current value is less than or equal to a second preset multiple of the set current; the range of the second preset multiple is 1.02 to 1.08.

[0059] The effective value of voltage is the root mean square value of the instantaneous AC voltage within the power frequency cycle, and it is a criterion parameter for no voltage. In the process, the original voltage signal is first acquired and preprocessed, and then the fundamental component is extracted through time-frequency domain transformation. Finally, the effective value of the fundamental voltage is calculated.

[0060] The effective value of current is the root mean square value of the instantaneous value of AC current within the power frequency cycle, and is the core parameter for the overcurrent criterion. During processing, the original current signal is acquired and preprocessed simultaneously, and then the fundamental component is extracted through time-frequency domain transformation, and finally the effective value of the fundamental current is calculated.

[0061] Time-frequency domain transformation processing refers to the signal processing method that converts the time-domain discrete electrical signal output by the signal acquisition module to the frequency domain space in order to extract the target power frequency fundamental component and suppress harmonics and noise interference; various frequency domain analysis methods such as fast Fourier transform, sliding window Fourier transform, and wavelet transform can be adopted.

[0062] In the embodiments of this invention, the preferred time-frequency domain transformation processing employs a 100-point Discrete Fourier Transform (DFT) to extract the fundamental voltage and current waves. This method offers advantages such as high fundamental wave extraction accuracy, moderate computational load, and strong anti-interference capability. It is suitable for the 50Hz power frequency signal characteristics of low-voltage distribution areas, ensuring the accuracy and real-time performance of subsequent fault diagnosis. Taking the extraction of the fundamental voltage wave as an example, the preferred calculation formula is:

[0063] .

[0064] in, The number of sampling points is set to 100. For the first Instantaneous values ​​of voltage signals acquired at each sampling time: Let be the angular frequency of the fundamental voltage wave. , The rated frequency of the fundamental voltage wave. ; For the first The sampling time corresponding to each sampling point.

[0065] The first preset multiple is determined based on the low-voltage distribution undervoltage protection standard to balance the risks of false alarms and missed alarms due to no voltage. Since normal voltage fluctuations in a distribution area will not drop below 0.35 times the rated voltage, and the actual power failure voltage will drop below 0.25 times the rated voltage, the range of the first preset multiple is set from 0.25 to 0.35 in order to accurately distinguish between normal voltage fluctuations and power failures in the distribution area.

[0066] The second preset multiple is determined based on the low-voltage circuit breaker setting specifications to balance the risks of overcurrent misjudgment and missed judgment. Since there are normal small load fluctuations in the distribution area and the circuit breaker has a slight setting error, the fault overcurrent will exceed the normal fluctuation range. In order to avoid judging normal fluctuations as fault overcurrent, the range of the second preset multiple is set to 1.02 to 1.08.

[0067] Furthermore, the no-voltage criterion is preferably based on the GB / T 14048.1-2023 standard, setting the effective voltage value on the high-voltage side to be less than or equal to 30% of the rated voltage on the high-voltage side, that is: .in, This represents the effective value of the high-voltage side voltage in the distribution substation area. The rated voltage of the high-voltage side of the distribution station area is usually 400V.

[0068] The preferred overcurrent criterion is based on a pre-defined non-tripping current standard, setting the overcurrent threshold to 1.05 times the setting current. .in, This is the effective value of the current at the switch. Set the current for the circuit breaker.

[0069] The method provided by the embodiments of the present invention extracts the fundamental wave and obtains the corresponding effective value by performing time-frequency domain transformation on the voltage and current signals of each distribution transformer area. It constructs no-voltage criteria and no-overcurrent criteria by using a first preset multiple and a second preset multiple of the limited interval, and obtains the judgment result by comparing them one by one. This method can accurately distinguish between normal electrical fluctuations and power failure or overcurrent fault states in the distribution transformer area, reasonably define the threshold interval of the criteria, reduce the probability of fault misjudgment and missed judgment, and improve the reliability and adaptability of fault identification in the distribution transformer area.

[0070] Further, step S2 of the method provided in the embodiments of the present invention preferably includes: if the fault condition of the distribution transformer area is a power outage fault, then the distribution transformer area is determined to be a faulty transformer area, otherwise it is a normal transformer area; the remaining capacity of the normal transformer area is matched with the load capacity of the faulty transformer area to obtain a first matching result; wherein, the load capacity is calculated based on the real-time total active power and power factor of the faulty transformer area before the power outage; the load rate of the normal transformer area is matched with the preset maximum load rate to generate a second matching result.

[0071] Specifically, the fault verification and identification are completed by combining the operating condition signals of the distribution substation with the dual criteria of no voltage and no overcurrent. Based on whether the characteristics of power outage faults are detected, the faulty substations to be transferred and the normal substations that can participate in load support are clearly divided.

[0072] Based on the rated capacity of the normal distribution area and the current operating conditions of the load, the remaining capacity of the distribution area that can be used for external load support is deduced; then, the remaining capacity is matched with the overall load demand of the faulty distribution area to complete the capacity supply and demand matching and obtain the first matching result.

[0073] The real-time total active power and corresponding power factor of the faulty transformer area during the stable operation period before the power outage are collected. According to the conventional conversion logic of power load capacity, the actual equivalent load capacity of the faulty transformer area is calculated from the two types of operating parameters.

[0074] The preferred formula for calculating the load capacity of the faulty transformer area in this invention embodiment is:

[0075] .

[0076] in, The load capacity of the faulty transformer area; The total active power during the stable operation period of the faulty transformer area before the power outage; The power factor is used because the load on the user side of the low-voltage distribution transformer area is mainly residential and small industrial and commercial loads. Its average power factor is usually in the range of 0.8 to 0.9. Taking 0.85 as a typical value can adapt to the load characteristics of most transformer areas, while avoiding the impact of extreme values ​​on capacity calculation. It is not necessary to collect the power factor of each transformer area separately to ensure the calculation accuracy.

[0077] By combining the current actual load and rated capacity of the normal distribution area, the real-time operating load rate is calculated. The calculated actual load rate is then compared with the preset maximum load rate to generate a second matching result for load rate compliance.

[0078] The preset maximum load rate is the maximum allowable load rate threshold when a normal distribution area participates in the transfer of fault loads. This threshold can be selected by considering the long-term safe operation requirements of the distribution transformer, the load fluctuation characteristics of the distribution area, and the short-term overload tolerance of the equipment. In this embodiment of the invention, 70% is preferred. This value provides sufficient safety margin to cope with load fluctuations during the transfer process and also aligns with the economical operating load rate range of the distribution transformer. It avoids the risks of equipment overheating, insulation aging, or power outages caused by excessively high load rates, ensuring the safe and stable transfer process.

[0079] The method provided by the embodiments of the present invention, by identifying faulty transformer areas and normal transformer areas, calculating the load capacity of the faulty transformer area based on the real-time total active power and power factor before the power outage, and simultaneously performing remaining capacity matching and load rate compliance verification for normal transformer areas, can achieve accurate matching between faulty loads and available transformer area resources, effectively avoid overload risks during the transfer process, and improve the safety, reliability, and power supply continuity of transformer area fault transfer.

[0080] Furthermore, the preferred formula for calculating the remaining capacity of a normal transformer area in this embodiment of the invention is:

[0081] .

[0082] .

[0083] in, This represents the remaining capacity of the normal distribution area; This is the rated capacity of a normal distribution area; This represents the real-time apparent power of a normal distribution area. This is the safety margin factor, with a value ranging from 1.05 to 1.2; This represents the total active power of a normal transformer substation. This represents the power factor for a normal distribution area.

[0084] The calculation formula provided in the embodiments of this invention first uses the total active power of a normal transformer area. With power factor Real-time apparent power was calculated Then introduce the safety margin factor The current load capacity is adjusted to allow for safety margins to account for equipment aging, load fluctuations, and environmental conditions; the final capacity is based on the rated capacity of the distribution area. After deducting the revised current load capacity, the remaining available capacity of the distribution area that can be used to support the faulty distribution area without affecting its own safe and stable operation is obtained. .

[0085] The embodiments of this invention obtain the remaining capacity of normal transformer areas by using the above calculation formula, which can accurately calculate the available capacity. By using a safety margin, the risks of over-calculation and overload in power transfer are avoided. Under the premise of ensuring safety, the redundant resources are maximized, providing reliable support for the transfer of faulty loads and improving power supply continuity.

[0086] Furthermore, step S3 of the method provided in the present invention preferably includes: if the remaining capacity of the normal distribution area matches the load capacity of the faulty distribution area, and the load rate of the normal distribution area matches the preset maximum load rate, then the matching result is qualified; the control host issues a power transfer control command to the normal distribution area and the faulty distribution area; based on the power transfer control command, the outgoing circuit breaker of the faulty distribution area is opened and the connecting line circuit breaker of the normal distribution area and the faulty distribution area is closed in sequence, so that the power supply of the faulty distribution area is disconnected and the power supply circuit of the normal distribution area and the faulty distribution area is connected, so as to realize interconnection, backup and power transfer.

[0087] Control commands are a set of dedicated commands issued by the control host to realize the interconnection, backup, and power transfer of distribution areas. They include the opening command of the outgoing circuit breaker of the faulty distribution area, the closing command of the connecting line circuit breaker, and the action timing control requirements. They are used to orderly control the circuit breakers to act according to the preset logic, complete the disconnection of the power supply to the faulty distribution area and the connection of the power supply circuit to the normal distribution area, and realize the transfer of power from the faulty load to the normal distribution area.

[0088] Preferably, the control commands in the embodiments of the present invention have a check code, which can verify the integrity and correctness of the command transmission process, effectively identify bit errors, packet loss or interference in wireless transmission, avoid circuit breaker malfunction or failure to operate due to command errors, improve the reliability and security of power transfer control, and ensure the stable execution of the interconnection backup power transfer process.

[0089] Furthermore, the present invention preferably employs the CRC-16 checksum method specified in the CDT power protocol, using a polynomial: (Corresponding to hexadecimal value 0x3D65) is the generator polynomial. At the sending end, a 16-bit CRC checksum is generated from the complete instruction frame (including instruction header, control code, data field, etc.) of the control instruction and appended to the end of the instruction frame before being sent together.

[0090] After receiving the instruction frame, the receiving end recalculates the CRC value for all content in the frame using the same polynomial and compares it with the received checksum. If the results match, the instruction is deemed valid and subsequent control actions are executed. If they do not match, the instruction is discarded or a retransmission is requested, thereby avoiding control instruction errors caused by wireless transmission errors.

[0091] The method provided by the embodiments of the present invention, by performing dual verification of the remaining capacity of normal distribution areas and the load capacity of faulty distribution areas, as well as the compliance of load rate, and issuing transfer control commands after the verification is qualified, and controlling the circuit breaker to open and close according to the preset timing, can realize the safe and orderly transfer of load from faulty distribution areas to normal distribution areas, avoid the risk of overload and malfunction of transfer without verification, improve the reliability and power supply continuity of interconnection backup transfer, and ensure the stability of power supply on the user side.

[0092] Further, step S4 of the method provided in the embodiments of the present invention preferably includes: real-time acquisition of voltage signals of the faulty transformer area after power transfer, preprocessing of the voltage signals, and calculation of the effective voltage value; wherein, the preprocessing includes filtering; continuous comparison of the effective voltage value with a preset recovery voltage threshold; wherein, the preset recovery voltage threshold is a third preset multiple of the rated voltage; the range of the third preset multiple is 0.70 to 0.80; if the preset recovery voltage threshold is met for a preset number of consecutive times, and the duration reaches a preset time threshold, then it is determined that the faulty transformer area has been restored to power supply, and a power supply restoration confirmation signal is generated; wherein, the range of the preset time threshold is 250ms to 350ms; based on the power supply restoration confirmation signal, the faulty transformer area is restored to independent power supply.

[0093] The third preset multiple is the ratio of the effective voltage value to the rated voltage in the criterion for restoring power supply after the faulty transformer area is transferred to another power supply area. It is used to define the voltage level threshold for power supply restoration.

[0094] Because short-term voltage dips are prone to occur in the initial stage of low-voltage power distribution system switching, in order to distinguish between instantaneous voltage fluctuations and stable power supply recovery status, and to avoid misjudging transient low voltage as not recovered or normal dips as recovered, the range of the third preset multiple is set to 0.70 to 0.80, taking into account the system voltage deviation characteristics and anti-interference requirements.

[0095] Furthermore, the third preset multiple is preferably 0.75. This value can ensure that the voltage has moved away from the fault low level, while adapting to the voltage sag characteristics in the early stage of power supply switching, balancing the anti-interference ability and recovery judgment timeliness of the criterion, and improving the accuracy of the power supply recovery criterion.

[0096] The preset time threshold is the shortest continuous time during which the effective voltage value must continuously meet the restoration voltage threshold when power is restored to the faulty transformer area. It is used to filter out the influence of transient interference on the restoration determination.

[0097] Since voltage dips and transient disturbances commonly seen in low-voltage power distribution systems typically last for less than 250ms, in order to filter out such short-term disturbances and avoid delays in the recovery process due to excessively long waiting times, the preset time threshold is set to a range of 250ms to 350ms, taking into account the transient characteristics of the system and the efficiency requirements of the judgment.

[0098] Furthermore, the preset time threshold is preferably 300ms. This value can effectively filter short-term voltage fluctuation interference and avoid misjudging power supply restoration, while also preventing the restoration process efficiency from being affected by excessive waiting time. It adapts to the transient characteristics of low-voltage power distribution systems and improves the reliability of restoration judgment.

[0099] The preset number of comparisons is the number of times the voltage must continuously meet the standard to determine when power supply is restored. This is used to filter out interference from single fluctuations. Too few comparisons can easily lead to false judgments, while too many can delay recovery. A reasonable range is 3-7 comparisons. This invention preferably uses 5 comparisons to balance anti-interference capabilities and judgment efficiency, thereby improving the reliability of the judgment criteria.

[0100] Furthermore, the method described above in the embodiments of the present invention, which involves real-time acquisition of the voltage signal of the faulty transformer area after power transfer, preprocessing the voltage signal, and calculating the effective voltage value, includes: real-time acquisition of the voltage signal of the faulty transformer area after power transfer; filtering the voltage signal to remove noise interference; performing time-frequency domain transformation on the filtered voltage signal to extract the fundamental voltage component and obtain the effective voltage value.

[0101] Specifically, the signal acquisition module of the faulty transformer area continuously collects the voltage of the high-voltage bus of the faulty transformer area according to the preset sampling period after the interconnection and backup power transfer operation is completed, and obtains real-time voltage sampling data to provide the original electrical signal for subsequent power supply restoration judgment.

[0102] The acquired raw voltage signal is preprocessed by digital filtering to remove electromagnetic interference from the line, high-frequency noise and instantaneous spikes introduced by equipment switching actions, thereby improving the purity and stability of the signal and eliminating interference effects for subsequent fundamental frequency extraction.

[0103] The preprocessed voltage signal is transformed in the time and frequency domain to extract the fundamental frequency component of the power grid and calculate its effective value, thereby reflecting the current actual power supply voltage level of the transformer area and serving as a quantitative basis for determining power supply restoration.

[0104] The method provided by the embodiments of the present invention, by acquiring the voltage signal of the faulty transformer area after power transfer in real time, and obtaining the effective voltage value through filtering, noise reduction and fundamental frequency extraction, can provide accurate and reliable quantitative basis for power supply restoration judgment, effectively avoid judgment deviation caused by interference, and improve the accuracy of judgment and anti-interference capability.

[0105] Furthermore, the method described above in the embodiments of the present invention, which restores independent power supply to the faulty transformer area based on the power supply restoration confirmation signal, preferably includes: opening the circuit breaker of the interconnection line between the normal transformer area and the faulty transformer area based on the power supply restoration confirmation signal; and closing the outgoing circuit breaker of the faulty transformer area after confirming that the interconnection line circuit breaker is in place, so that the faulty transformer area restores independent power supply.

[0106] Specifically, after receiving the power supply restoration confirmation signal for the faulty transformer area, the control host issues a tripping command to the interconnecting circuit breaker to disconnect the interconnecting power supply circuit between the normal transformer area and the faulty transformer area, thereby relieving the transfer load of the normal transformer area and restoring it to its original operating state.

[0107] After receiving the position feedback signal that the connecting line circuit breaker is in the tripped position, the control host sends a closing command to the outgoing circuit breaker of the faulty transformer area to restore the connection between the faulty transformer area and the original power supply, thereby realizing independent power supply to the faulty transformer area and completing the closed loop of the power transfer process.

[0108] The method provided by the embodiments of the present invention, by controlling the circuit breaker of the tie line to open first according to the timing of the power restoration confirmation signal, and then closing the outgoing circuit breaker of the faulty transformer area after verifying that the opening is in place, can realize the smooth disconnection of the transformer area transfer circuit and the orderly restoration of independent power supply to the faulty transformer area, avoid the electrical operation risks caused by disorderly switching, and ensure the safety and reliability of the distribution transformer area switching process.

[0109] like Figure 2 As shown in the embodiments of the present invention, an adaptive interconnection backup power supply system for distribution radio areas is provided, which is applied to the adaptive interconnection backup power supply method for distribution radio areas described in the above embodiments.

[0110] The system includes: a signal acquisition module, a control host, and an execution module. The signal acquisition module collects operating condition signals from multiple distribution substations in real time and sends them to the control host. The control host receives the operating condition signals and compares them with multiple criteria to determine the fault status of each distribution substation. These criteria include: no-voltage criterion and no-overcurrent criterion. Based on the fault status, the system distinguishes between faulty and normal substations and performs dual matching between the remaining capacity of normal substations and the load capacity of faulty substations, and between the load rate of normal substations and the preset maximum load rate, generating matching results. The remaining capacity is based on the rated capacity of the normal substations. The power supply is calculated based on the capacity, real-time apparent power, and safety margin coefficient. If the matching result is qualified, a power transfer control signal is sent to the execution module. The voltage signal of the faulty transformer area after the power transfer is completed is continuously compared with the preset recovery voltage threshold. If the preset recovery voltage threshold is met for a preset number of consecutive preset times and the duration reaches the preset time threshold, it is determined that the faulty transformer area has been restored to power supply, and a power restoration independent power supply signal is sent to the execution module. The execution module is used to disconnect the power supply of the faulty transformer area based on the power transfer control signal and connect the power supply circuit between the normal transformer area and the faulty transformer area to realize interconnection, backup, and power transfer. Based on the power restoration independent power supply signal, the faulty transformer area is restored to independent power supply.

[0111] The system provided by the embodiments of the present invention is a modular hardware implementation carrier for the adaptive interconnection backup and transfer method of distribution substations in the above embodiments. Each functional module of the system corresponds one-to-one with the method flow. The signal acquisition module is used to acquire the operating condition signal in the method. The fault discrimination module, remaining capacity calculation module and dual matching module of the control host respectively implement the fault discrimination, capacity calculation and dual matching verification logic in the method. The execution module is used to execute the circuit breaker switching and power supply restoration actions in the method. For the specific implementation method of the steps, please refer to the aforementioned method embodiments.

[0112] The system provided in the embodiments of this invention, through the coordinated cooperation of the distribution area-side acquisition unit and the centralized control host, constructs a fully closed-loop control link from operating condition acquisition, fault identification, power transfer verification to action execution and power restoration. It can realize the rapid differentiation between faulty and normal distribution areas, the dual safety control of power transfer capacity and load rate, and the accurate determination and orderly switching of power restoration after power transfer. It effectively avoids the risks of overload and malfunction of power transfer without verification, and improves the reliability, safety and power supply continuity of distribution area interconnection backup power transfer.

[0113] Furthermore, distribution substation A includes a first signal acquisition module and a first execution module. Distribution substation B includes a second signal acquisition module and a second execution module. The first and second signal acquisition modules are used to acquire operating condition signals such as voltage and current of the corresponding distribution substation in real time and upload them to the control host; the first and second execution modules are used to receive instructions from the control host and drive the outgoing circuit breaker and tie line circuit breaker to complete the opening / closing actions, realizing the transfer and restoration of power supply.

[0114] The control host includes: a fault diagnosis module, a remaining capacity calculation module, a dual matching module, and a control module. The fault diagnosis module distinguishes between faulty and normal transformer areas by comparing signals using no-voltage and no-overcurrent criteria. The remaining capacity calculation module calculates the supportable capacity based on the rated capacity of normal transformer areas, real-time apparent power, and safety margin coefficient, while simultaneously calculating the load capacity based on the power data of the faulty transformer area before the power outage. The dual matching module performs capacity matching and load rate matching verification, generating transfer and power restoration control signals. The control module distributes various control signals to the corresponding execution modules, ensuring reliable command transmission.

[0115] During system operation, the signal acquisition modules of distribution substations A and B continuously transmit operating condition data back to the control host. The fault identification module of the control host accurately identifies and classifies faulty substations and supportable normal substations based on no-voltage and no-overcurrent criteria. The remaining capacity calculation module calculates the remaining support capacity of normal substations and the load demand of faulty substations. After the dual matching module completes dual verification of capacity adaptability and load rate compliance, it issues a transfer control command to the substation execution unit, driving the circuit breaker to complete the interconnection and backup transfer of power supply to the faulty substation according to the preset sequence of tripping the faulty substation and closing the tie line. During the transfer, the voltage signal of the faulty substation is continuously preprocessed and the recovery status is determined. After confirming that the power supply is stable, a recovery command is issued, and the tie line tripping and faulty substation closing operations are completed in sequence, restoring independent power supply to the faulty substation and realizing a closed-loop process. Through modular and collaborative full-link management and control, this system realizes rapid fault identification, safe transfer verification, and orderly execution of power restoration, effectively avoiding the risks of overload and malfunction, and improving the reliability and continuity of power supply for interconnection and backup transfer of distribution substations.

[0116] Furthermore, such as Figure 3 As shown in the embodiment of the present invention, the signal acquisition module adopts a dual-channel independent acquisition architecture for voltage and current. The voltage acquisition channel converts the high-voltage signal of the distribution area into a suitable low-voltage signal through a voltage transformer. After amplification, filtering, and level adjustment by the signal conditioning circuit, it is converted into a digital signal by the ADC (Analog-to-Digital Converter) acquisition module and sent to the MCU (Microcontroller Unit). Similarly, the current acquisition channel completes the digital processing of the current signal through a current transformer, signal conditioning circuit, and ADC acquisition module and inputs it into the MCU. The MCU performs moving average filtering and noise reduction processing on the two acquisition data channels, and finally uploads the processed voltage and current operating condition data to the control host through the wireless transmission module, providing reliable raw data support for subsequent fault diagnosis, capacity calculation, and power transfer control.

[0117] To further illustrate the implementation process and practical application effects of the adaptive interconnection backup and transfer method and system for distribution radio areas provided in the embodiments of the present invention, the following provides an exemplary application scenario description of this solution in conjunction with specific hardware parameters, working process examples and anti-interference verification scenarios.

[0118] The hardware parameters are set as follows:

[0119] Rated voltage of distribution area The no-pressure criterion corresponds to the no-pressure threshold as follows: .

[0120] Circuit breaker setting current The overcurrent threshold corresponding to no overcurrent criterion is .

[0121] Rated capacity of transformer in power supply area Load capacity of the faulty transformer area .

[0122] The signal sampling frequency is 50Hz, the sliding window of the moving average filter is N=3, the control command adopts CDT power protocol CRC-16 check, and the polynomial is 0x3D65.

[0123] The safety margin factor is set to 1.1, the recovery voltage threshold corresponding to the power supply restoration criterion is 0.75×400=300V, and the preset recovery time threshold is 300ms.

[0124] Example of work process:

[0125] (1) The high-voltage side of transformer area A experienced a power outage, and its signal acquisition module detected the outage. , After confirming the fault three times in a row, the operating data will be reported to the control host.

[0126] (2) The fault diagnosis module of the control host determines that area A is a faulty area and area B is a normal area; the remaining capacity calculation module is based on the rated capacity and real-time apparent power of area B. Given A and a safety margin factor of 1.1, the remaining capacity is calculated. The dual matching module verifies the remaining capacity against the load capacity of the faulty distribution area. The load rate of transformer area B meets the matching conditions as well as the preset maximum load rate.

[0127] (3) The control host sends the circuit breaker Q1 tripping command to the execution module of the distribution area A. After receiving the tripping feedback, it takes 2 seconds. Then, it sends the closing command to the execution module corresponding to the tie switch Q3, which takes 2 seconds. The total time for the interconnection backup and power supply process is 6 seconds.

[0128] (4) After power supply is restored to the high-voltage side of transformer area A, the signal acquisition module detects a voltage signal of If the voltage signal continuously meets the recovery voltage threshold requirement for a period of time that reaches the preset recovery time threshold, the control host sends a tripping command to the tie switch Q3, and then sends a closing command to the circuit breaker Q1, and the transformer area A resumes independent power supply.

[0129] The anti-interference verification is as follows:

[0130] During wireless signal transmission, the CRC-16 checksum used in the control commands can successfully detect 99.998% of transmission errors, thus avoiding malfunctions caused by incorrect commands.

[0131] For scenarios involving instantaneous voltage fluctuations, such as a voltage drop to 150V lasting for 50ms, the system does not trigger a false judgment because the preset recovery time threshold requirement has not been met, effectively filtering out short-term interference.

[0132] Embodiments of the present invention also provide a non-transitory machine-readable medium storing a computer program, wherein the computer program, when executed by a computer's processor, is used to cause the computer to perform a method according to an embodiment of the present invention.

[0133] Embodiments of the present invention also provide a computer program product, including a computer program, wherein the computer program, when executed by a computer's processor, is used to cause the computer to perform the method of an embodiment of the present invention.

[0134] An embodiment of the present invention also provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program executable by the at least one processor, which, when executed by the at least one processor, causes the electronic device to perform the method of the embodiment of the present invention.

[0135] refer to Figure 4 The present invention will now describe a structural block diagram of an electronic device that can serve as an embodiment of the present invention, serving as an example of a hardware device applicable to various aspects of the present invention. The electronic device is intended to represent various forms of digital electronic computer devices, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0136] like Figure 4 As shown, the electronic device includes a computing unit 501, which can perform various appropriate actions and processes based on a computer program stored in ROM (Read-Only Memory) 502 or loaded from storage unit 508 into RAM (Random Access Memory) 503. RAM 503 can also store various programs and data required for the operation of the electronic device. The computing unit 501, ROM 502, and RAM 503 are interconnected via bus 504. An I / O interface (Input / Output Interface) 505 is also connected to bus 504.

[0137] Multiple components in the electronic device are connected to I / O interface 505, including: input unit 506, output unit 507, storage unit 508, and communication unit 509. Input unit 506 can be any type of device capable of inputting information into the electronic device. Input unit 506 can receive input digital or character information and generate key signal inputs related to user settings and / or function control of the electronic device. Output unit 507 can be any type of device capable of presenting information and may include, but is not limited to, a display, speaker, video / audio output terminal, vibrator, and / or printer. Storage unit 508 may include, but is not limited to, disks and optical discs. Communication unit 509 allows the electronic device to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks, and may include, but is not limited to, modems, network cards, infrared communication devices, and / or wireless communication transceivers, such as Bluetooth devices, WiFi devices, WiMax devices, cellular communication devices, and / or the like.

[0138] The computing unit 501 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the computing unit 501 include, but are not limited to, a CPU (Central Processing Unit), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing units, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 501 performs the various methods and processes described above. For example, in some embodiments, the method embodiments of the present invention can be implemented as a computer program tangibly contained in a machine-readable medium, such as storage unit 508. In some embodiments, part or all of the computer program can be loaded and / or installed on an electronic device via ROM 502 and / or communication unit 509. In some embodiments, the computing unit 501 can be configured to perform the methods described above by any other suitable means (e.g., by means of firmware).

[0139] Computer programs for implementing the methods of embodiments of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor or controller of a general-purpose computer, special-purpose computer, or other programmable data processing apparatus, such that when executed by the processor or controller, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0140] In the context of embodiments of this invention, a machine-readable medium can be a tangible medium that may contain or store a program for use by or in conjunction with an instruction execution system, apparatus, or device. A machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable signal medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, or infrared systems, apparatus, or devices, or any suitable combination of the foregoing. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0141] It should be noted that the term "comprising" and its variations used in the embodiments of this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The modifications of "one" and "a plurality" mentioned in the embodiments of this invention are illustrative and not restrictive, and those skilled in the art should understand that unless explicitly indicated otherwise in the context, they should be understood as "one or more".

[0142] The steps described in the method embodiments provided by the present invention can be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of protection of the present invention is not limited in this respect.

[0143] The term "embodiment" in this specification refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily imply the same embodiment, nor does it imply independence or alternativeity from other embodiments. The various embodiments in this specification are described in a related manner, with reference to each other for similar or identical parts. In particular, for apparatus, device, and system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, and relevant details are referred to in the description of the method embodiments.

[0144] The above-described embodiments are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A method for adaptive interconnection and backup switching of distribution radio areas, characterized in that, The method includes: The operating condition signals of multiple distribution transformer substations are collected in real time and compared with multiple criteria to determine the fault status of each distribution transformer substation; wherein, the criteria include: no-voltage criterion and no-overcurrent criterion; Based on the fault conditions, faulty transformer areas and normal transformer areas are distinguished, and the remaining capacity of the normal transformer area is matched with the load capacity of the faulty transformer area, and the load rate of the normal transformer area is matched with the preset maximum load rate to generate matching results; wherein, the remaining capacity is calculated based on the rated capacity, real-time apparent power and safety margin factor of the normal transformer area. If the matching result is qualified, the power supply of the faulty transformer area will be disconnected, and the power supply circuit of the normal transformer area and the faulty transformer area will be connected to achieve interconnection, backup and transfer of power supply. The voltage signal of the faulty transformer area after the power transfer is completed is continuously compared with the preset recovery voltage threshold. If the preset recovery voltage threshold is met for a preset number of consecutive times and the duration reaches the preset time threshold, then the faulty transformer area is restored to independent power supply.

2. The adaptive interconnection and backup switching method for distribution radio areas according to claim 1, characterized in that, The operating condition signals of multiple distribution transformer substations collected in real time are compared with multiple criteria to determine the fault status of each distribution transformer substation, including: Real-time acquisition of operating condition signals from multiple distribution substations; wherein, the operating condition signals include: voltage signals, current signals, switch position signals, and rated capacity signals; The operating condition signals corresponding to each of the aforementioned distribution radio zones are compared with the no-voltage criterion and the no-overcurrent criterion, respectively. If the distribution transformer area simultaneously meets the no-voltage criterion and the no-overcurrent criterion, and the duration meets the first preset time threshold, it is confirmed that there is a power outage fault in the distribution transformer area.

3. The adaptive interconnection and backup power transfer method for distribution radio areas according to claim 2, characterized in that, The operating condition signals corresponding to each of the aforementioned distribution substations are compared with the no-voltage criterion and the no-overcurrent criterion, respectively, including: The voltage and current signals of each of the distribution stations are processed by time-frequency domain transformation to extract the fundamental voltage and fundamental current, and the corresponding effective voltage and effective current values ​​are obtained. Each of the aforementioned effective voltage values ​​is compared with a no-voltage criterion to obtain a corresponding first judgment result; wherein, the no-voltage criterion is that the effective voltage value is less than or equal to a first preset multiple of the rated voltage; the range of the first preset multiple is 0.25 to 0.35; Each of the current effective values ​​is compared with the no-overcurrent criterion to obtain the corresponding second judgment result; wherein, the no-overcurrent criterion is that the current effective value is less than or equal to a second preset multiple of the setting current; the range of the second preset multiple is 1.02 to 1.

08.

4. The adaptive interconnection and backup switching method for distribution radio areas according to claim 1, characterized in that, Based on the fault conditions, faulty power distribution areas are distinguished from normal power distribution areas. A dual matching process is performed: the remaining capacity of the normal power distribution area is compared with the load capacity of the faulty power distribution area, and the load rate of the normal power distribution area is compared with the preset maximum load rate. Matching results are generated, including: If the fault condition of the distribution transformer area is a power outage, then the distribution transformer area is determined to be a faulty transformer area; otherwise, it is a normal transformer area. The remaining capacity of the normal distribution area is matched with the load capacity of the faulty distribution area to obtain a first matching result; wherein, the load capacity is calculated based on the real-time total active power and power factor of the faulty distribution area before the power outage. The load rate of the normal transformer area is matched with the preset maximum load rate to generate a second matching result.

5. The adaptive interconnection and backup switching method for distribution radio areas according to claim 4, characterized in that, The formula for calculating the remaining capacity of the normal transformer area is: ； ； in, This represents the remaining capacity of the normal distribution area; This is the rated capacity of a normal distribution area; This represents the real-time apparent power of a normal distribution area. This is the safety margin factor, with a value ranging from 1.05 to 1.2; This represents the total active power of a normal transformer substation. This represents the power factor for a normal distribution area.

6. The adaptive interconnection and backup power transfer method for distribution radio areas according to claim 1, characterized in that, If the matching result is satisfactory, the power supply to the faulty transformer area is disconnected, and the power supply circuits of the normal transformer area and the faulty transformer area are connected to achieve interconnection, backup, and power transfer, including: If the remaining capacity of the normal distribution area matches the load capacity of the faulty distribution area, and the load rate of the normal distribution area matches the preset maximum load rate, then the matching result is qualified. The control host issues power transfer control commands to the normal and faulty power distribution areas; Based on the power transfer control command, the outgoing circuit breaker of the faulty transformer area is opened and the connecting circuit breaker of the normal transformer area and the faulty transformer area is closed in sequence, so that the power supply of the faulty transformer area is disconnected and the power supply circuit of the normal transformer area and the faulty transformer area is connected, so as to realize interconnection, backup and power transfer.

7. The adaptive interconnection and backup power transfer method for distribution radio areas according to claim 1, characterized in that, The voltage signal of the faulty transformer area after the power transfer is completed is continuously compared with a preset recovery voltage threshold. If the preset recovery voltage threshold is met for a preset number of consecutive times and the duration reaches a preset time threshold, then the faulty transformer area is restored to independent power supply, including: The voltage signal of the faulty transformer area after power transfer is acquired in real time, the voltage signal is preprocessed, and the effective voltage value is calculated; wherein, the preprocessing includes filtering. The effective voltage value is continuously compared with a preset recovery voltage threshold; wherein the preset recovery voltage threshold is a third preset multiple of the rated voltage; the range of the third preset multiple is 0.70 to 0.

80. If the preset recovery voltage threshold is met for a preset number of consecutive preset times, and the duration reaches a preset time threshold, then the faulty transformer area is determined to have been restored to power, and a power restoration confirmation signal is generated; wherein, the preset time threshold ranges from 250ms to 350ms. Based on the power restoration confirmation signal, the faulty transformer area will be restored to independent power supply.

8. The adaptive interconnection and backup switching method for distribution radio areas according to claim 7, characterized in that, The voltage signal of the faulty transformer area after power transfer is acquired in real time, the voltage signal is preprocessed, and the effective voltage value is calculated, including: Real-time acquisition of voltage signals from the faulty transformer area after power transfer; The voltage signal is filtered to remove noise interference. The filtered voltage signal is subjected to time-frequency domain transformation to extract the fundamental voltage component and obtain the effective voltage value.

9. The adaptive interconnection and backup switching method for distribution radio areas according to claim 7, characterized in that, Based on the power restoration confirmation signal, restoring independent power supply to the faulty transformer area includes: Based on the power restoration confirmation signal, the circuit breaker of the interconnection line between the normal transformer area and the faulty transformer area is tripped; After confirming that the circuit breaker of the connecting line is in the open position, the outgoing circuit breaker of the faulty transformer area is closed to restore independent power supply to the faulty transformer area.

10. A distribution radio area adaptive interconnection backup and transfer system, characterized in that, The system includes: a signal acquisition module, a control host, and an execution module; The signal acquisition module is used to acquire the operating condition signals of multiple distribution radio areas in real time and send them to the control host. The control host is used to receive the operating condition signal and compare the operating condition signal with multiple criteria to determine the fault status of each distribution substation. The criteria include: no-voltage criterion and no-overcurrent criterion. Based on the fault status, faulty substations and normal substations are distinguished, and the remaining capacity of the normal substation is matched with the load capacity of the faulty substation, and the load rate of the normal substation is matched with a preset maximum load rate to generate a matching result. The remaining capacity is calculated based on the rated capacity, real-time apparent power, and safety margin coefficient of the normal substation. If the matching result is satisfactory, a power transfer control signal is sent to the execution module. The voltage signal of the faulty substation after power transfer is completed is continuously compared with a preset recovery voltage threshold. If the preset recovery voltage threshold is met for a preset number of consecutive times and the duration reaches a preset time threshold, the faulty substation is determined to have resumed power supply, and a power supply recovery independent power supply signal is sent to the execution module. The execution module is used to disconnect the power supply of the faulty transformer area based on the power transfer control signal, and connect the power supply circuit of the normal transformer area and the faulty transformer area to realize interconnection and backup power transfer; and to restore the independent power supply of the faulty transformer area based on the independent power supply restoration signal.

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