Remote power cut and power transmission method and system based on power loop multi-dimensional monitoring management and control

Abstract

The invention relates to the technical field of data processing, in particular to a remote power outage and transmission method and system based on multi-dimensional monitoring and control of a power loop. The method comprises the following steps: acquiring a voltage sequence and a current sequence of an incoming line side of a circuit breaker and an outgoing line side of a contactor in each power frequency period, and acquiring an instantaneous active power difference value and a current effective value of each sampling point in each power frequency period; based on the instantaneous active power difference value and the current effective value, static equivalent resistance of a contactor contact in each power frequency period is obtained; and obtaining a micro-arc risk index of each power frequency period based on the instantaneous active power difference value, obtaining a thermal safety residual capacity of each power frequency period according to the static equivalent resistance, the current effective value and the micro-arc risk index, and controlling remote power cut and power transmission of the contactor according to the thermal safety residual capacity. According to the invention, accurate identification and safe locking of loop hidden dangers are realized.

Description

Technical Field

[0001] This invention relates to the field of data processing technology, and in particular to a remote power outage and restoration method and system based on multi-dimensional monitoring and control of power circuits. Background Technology

[0002] In continuous production industries such as coal mining, chemical engineering, and metallurgy, remote centralized control of power circuits is a core component for achieving automated production processes and reduced-management operation and maintenance. As the core switching device for executing remote power-on and power-off commands, the contact state of the contactors directly determines the safety and reliability of the power supply circuit.

[0003] However, in actual industrial remote management and control scenarios, existing monitoring and control technologies still have the following prominent technical limitations when facing complex working conditions: Existing algorithms typically collect current or voltage data from the contactor's outgoing side and determine the circuit status based on the effective current or voltage value (RMS). The effective current or voltage value is obtained by integrating and averaging all current or voltage data within the power frequency cycle. By judging whether the effective current or voltage value is within the normal threshold range, it is determined whether the contactor contacts have aged.

[0004] However, in the early stages of contactor contact aging, failure modes often manifest as millisecond-level contact micro-vibration or localized micro-arc discharge. These transient physical phenomena are extremely short in duration and highly concentrated in energy density. However, traditional algorithms smooth out these high-frequency and weak fault characteristics, causing the fault characteristics to be submerged by normal signals. This results in the current data read by the central control system or operators still being within the normal threshold range, while the contactor contacts in the field have already shown early faults. Performing remote disconnection or engagement operations at this time can easily lead to contact welding, phase-to-phase short circuits, or even explosions, causing significant equipment damage. Summary of the Invention

[0005] To address the technical problem that existing technologies, when judging circuit status based on the effective value of current or voltage, easily filter out high-frequency and weak fault characteristics such as micro-vibration of contacts or local micro-arc discharge, this invention provides a remote power outage and restoration method and system based on multi-dimensional monitoring and control of power circuits.

[0006] In a first aspect, the present invention provides a remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits, employing the following technical solution: A remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits includes the following steps: The voltage and current sequences of the circuit breaker incoming side and the contactor outgoing side are collected in each power frequency cycle; based on the instantaneous power input on the circuit breaker incoming side and the instantaneous power output on the contactor outgoing side, the instantaneous active power difference of each sampling point in each power frequency cycle is obtained. Based on the current values ​​of all sampling points on the incoming side of the circuit breaker in each power frequency cycle, the effective value of the current in each power frequency cycle is obtained; based on the instantaneous active power difference of each sampling point in each power frequency cycle, and combined with the effective value of the current, the static equivalent resistance of the contactor contacts in each power frequency cycle is obtained; based on the instantaneous active power difference of each sampling point in each power frequency cycle, the micro-arc risk index in each power frequency cycle is obtained. Based on the static equivalent resistance, the effective value of the current, and the micro-arc risk index, the thermal safety remaining capacity for each power frequency cycle is obtained; the remote power supply and shutdown of the contactor is controlled based on the thermal safety remaining capacity for each power frequency cycle to achieve safe management and control of the power circuit.

[0007] The innovation of this invention lies in constructing an instantaneous active power difference by synchronously collecting current and voltage data from the circuit breaker's incoming side and the contactor's outgoing side. This allows for precise capture of the power consumed by all resistive components (wire resistance, contact resistance) within the circuit, providing a core quantitative basis for contactor health status detection. Furthermore, based on the instantaneous active power difference at each sampling point within each power frequency cycle, and combined with the effective current value, the static equivalent resistance of the contactor contacts for each power frequency cycle is obtained, automatically filtering out reactive interference from motor back electromotive force and line reactance. Further, based on the instantaneous active power difference at each sampling point within each power frequency cycle, a micro-arc risk index for each power frequency cycle is obtained, enabling the sensitive capture of early fault signals of micro-arcs at the contacts. Finally, by combining the static equivalent resistance, effective current value, and micro-arc risk index, a multi-dimensional assessment of the remaining thermal safety capacity is conducted, achieving early warning and graded interlocking of potential hazards in the power circuit. This significantly improves equipment safety during remote power outages and restorations, preventing contact welding or explosion accidents.

[0008] Preferably, obtaining the instantaneous active power difference at each sampling point within each power frequency cycle includes: ; In the formula, This represents the instantaneous active power difference at the i-th sampling point within the t-th power frequency cycle; This represents the voltage value of the circuit breaker's incoming side at the i-th sampling point during the t-th power frequency cycle; This represents the current value on the incoming side of the circuit breaker at the i-th sampling point during the t-th power frequency cycle; This represents the voltage value at the i-th sampling point on the outgoing side of the contactor during the t-th power frequency cycle; represents the current value of the contactor's outgoing side at the i-th sampling point during the t-th power frequency cycle; || represents the absolute value sign.

[0009] It accurately captures the power consumed by all resistive components (wire resistance, contact resistance) inside the circuit, providing a core basis for contactor health status detection.

[0010] Preferably, obtaining the effective current value for each power frequency cycle includes: For the current values ​​on the incoming side of the circuit breaker at all sampling points during the t-th power frequency cycle, calculate their root mean square value, which is taken as the effective value of the current during the t-th power frequency cycle.

[0011] Preferably, obtaining the static equivalent resistance of the contactor contacts for each power frequency cycle includes: ; In the formula, The static equivalent resistance represents the t-th power frequency cycle, and its value directly corresponds to the contact state of the contact point. This represents the mean of the instantaneous active power differences among all sampling points within the t-th power frequency cycle; This represents the effective value of the current during the t-th power frequency cycle; This represents the preset hyperparameters used to avoid a denominator of 0; This represents the pre-calibrated reference value of the inherent impedance of the conductor between the circuit breaker and the contactor.

[0012] Avoid reactive interference from motor back electromotive force and line reactance.

[0013] Preferably, obtaining the micro-arc risk index for each power frequency cycle includes: ; In the formula, The micro-arc risk index represents the t-th power frequency cycle; This represents the instantaneous active power difference at the i-th sampling point within the t-th power frequency cycle; This represents the mean of the instantaneous active power differences among all sampling points within the t-th power frequency cycle; This represents the number of sampling points within the t-th power frequency cycle.

[0014] It can keenly detect early fault signals of micro-arcs at the contact points.

[0015] Preferably, obtaining the thermal safety remaining capacity for each power frequency cycle includes: ; In the formula, This represents the thermal safety remaining capacity during the t-th power frequency cycle; This represents the maximum permissible heat capacity threshold of the contact material; This represents the total number of historical cycles for the t-th power frequency cycle; The effective value of the current in the k-th historical period represents the t-th power frequency cycle; The static equivalent resistance represents the k-th historical cycle of the t-th power frequency cycle; Represents the duration of the power frequency cycle; The micro-arc risk index represents the t-th power frequency cycle; The acceleration weighting coefficient representing the thermal damage caused by the micro-arc; This represents the logarithmic function.

[0016] Preferably, the remote power-on / off control of the contactor based on the thermal safety remaining capacity for each power frequency cycle includes: When the thermal safety remaining capacity in the t-th power frequency cycle is greater than 0, the contactor continues to be engaged, and the system operates normally with power supply; when the thermal safety remaining capacity in the t-th power frequency cycle is equal to 0, the system immediately triggers an early warning command to prompt preparation for shutdown; when the thermal safety remaining capacity in the t-th power frequency cycle is less than 0, an emergency trip control command is immediately executed to forcibly disconnect the contactor.

[0017] It has achieved closed-loop control of potential hazards in the power circuit.

[0018] Preferably, the acquisition of the voltage and current sequences on the incoming side of the circuit breaker and the outgoing side of the contactor within each power frequency cycle includes: Based on sampling time interval In addition to the preset power frequency cycle duration, the system simultaneously collects the voltage and current data of the circuit breaker incoming side at each sampling point under each power frequency cycle, as well as the voltage and current data of the contactor outgoing side at each sampling point under each power frequency cycle, to obtain the voltage and current sequences of the circuit breaker incoming side and the contactor outgoing side under each power frequency cycle.

[0019] Preferably, obtaining the sampling time interval includes: The preset power frequency cycle duration is The preset number of sampling points per power frequency cycle is 1. Sampling time interval .

[0020] Secondly, the present invention provides a remote power outage and restoration system based on multi-dimensional monitoring and control of power circuits, employing the following technical solution: A remote power outage and restoration system based on multi-dimensional monitoring and control of power circuits includes a processor and a memory. The memory stores computer program instructions, and when the computer program instructions are executed by the processor, the aforementioned remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits is implemented.

[0021] By adopting the above technical solution, the remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits is generated into a computer program and stored in a memory so that it can be loaded and executed by a processor. Terminal devices can then be made based on the memory and processor for convenient use.

[0022] This invention has the following technical advantages: First, it simultaneously collects current and voltage data from the circuit breaker's incoming side and the contactor's outgoing side to construct an instantaneous active power difference, which can accurately capture the power consumed by all resistive components inside the circuit, providing a core quantitative basis for contactor health status detection. Next, it obtains the static equivalent resistance of the contactor contacts for each power frequency cycle, automatically filtering out reactive interference from motor back electromotive force and line reactance. Then, based on the instantaneous active power difference of each sampling point within each power frequency cycle, it obtains the micro-arc risk index for each power frequency cycle, which can keenly capture early fault signals of micro-arcs at the contacts. Finally, it combines the static equivalent resistance, effective current value, and micro-arc risk index to evaluate the remaining thermal safety capacity from multiple dimensions, thereby achieving safe management and control of the power circuit. Attached Figure Description

[0023] Figure 1 This is a flowchart of the remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits in an embodiment of the present invention; Figure 2 This is a schematic diagram comparing the impedance calculation results of the present invention based on the instantaneous active power difference with the traditional voltage difference method; Figure 3 This is a schematic diagram of the dynamic feature extraction of micro-arcs based on statistical kurtosis analysis according to the present invention; Figure 4 This is a schematic diagram of the anti-electric shock safety boundary control logic provided by the present invention, which uses thermal-arc dual-dimensional weights. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0025] This invention discloses a remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits, referring to... Figure 1 This includes steps S1-S4: S1: Collect the voltage and current sequences of the circuit breaker incoming side and the contactor outgoing side within each power frequency cycle; based on the instantaneous power input from the circuit breaker incoming side and the instantaneous power output from the contactor outgoing side, obtain the instantaneous active power difference at each sampling point within each power frequency cycle.

[0026] It should be noted that in the complex power environment of a coal preparation plant, the initial failure of contactor contacts often manifests as millisecond-level micro-vibrations or micro-arc discharges. These transient phenomena are extremely short-lived. If the traditional effective value is used to judge the early failure of contactor contacts, the weak high-frequency fault characteristics of the early contactor contacts will be smoothed out by long-period averaging calculations, causing the system to ignore the early contact faults. In addition, there is a physical distance between the circuit breaker and the contactor. If the sampling at both ends is not synchronized, load fluctuations (such as changes in motor slip) will cause a natural phase misalignment in the voltage and current waveforms at both ends. This misalignment will be miscalculated as line loss. Therefore, in order to accurately capture micro-vibrations and eliminate phase errors, the system must establish a synchronous acquisition mechanism.

[0027] In this embodiment of the invention, the preset power frequency cycle duration is: =20ms, the preset number of sampling points per power frequency cycle is In this embodiment of the invention, a preset In other embodiments, implementers may pre-determine specific implementation methods. The value; sampling time interval This ensures coverage and capture of microscopic arc transients lasting up to 0.1 ms; Based on sampling time interval In addition to the preset power frequency cycle duration, the system simultaneously collects the voltage and current data of the circuit breaker incoming side at each sampling point under each power frequency cycle, as well as the voltage and current data of the contactor outgoing side at each sampling point under each power frequency cycle, to obtain the voltage and current sequences of the circuit breaker incoming side and the contactor outgoing side under each power frequency cycle.

[0028] It should be noted that, based on the voltage and current on the incoming side of the circuit breaker and the voltage and current on the outgoing side of the contactor, an instantaneous active power difference reflecting the resistive losses of the circuit is constructed. In the transmission circuit from the circuit breaker to the contactor, the instantaneous active power difference reflects the instantaneous power loss of all resistive components (wire resistance, contact resistance) inside the circuit. The contact resistance is the core variable loss source, and its loss accounts for the dominant proportion. When the instantaneous active power difference is large, it indicates that the health status of the contacts has deteriorated. Therefore, the instantaneous active power difference provides a core basis for the accurate quantitative detection of the contactor's health status.

[0029] In this embodiment of the invention, the instantaneous active power difference at each sampling point within the t-th power frequency cycle is obtained: ; In the formula, This represents the instantaneous active power difference at the i-th sampling point within the t-th power frequency cycle; This represents the voltage value of the circuit breaker's incoming side at the i-th sampling point during the t-th power frequency cycle; This represents the current value on the incoming side of the circuit breaker at the i-th sampling point during the t-th power frequency cycle; This represents the voltage value at the i-th sampling point on the outgoing side of the contactor during the t-th power frequency cycle; Represents the current value at the i-th sampling point on the contactor's outgoing side during the t-th power frequency cycle; || represents the absolute value sign; It represents the instantaneous power input on the incoming side of the circuit breaker, reflecting the instantaneous power input on the power supply side (including reactive power supplied to loads such as motors and active power consumed by resistive components in the circuit). This represents the instantaneous power output from the contactor's output side, reflecting the instantaneous active power output from the contactor to loads such as motors. It reflects the power consumed by all resistive components (wire resistance, contact resistance) inside the circuit at the time corresponding to the i-th sampling point within the t-th cycle, providing core quantitative basis for contactor health status detection.

[0030] S2: Based on the current values ​​of all sampling points on the incoming side of the circuit breaker in each power frequency cycle, obtain the effective value of the current in each power frequency cycle; based on the instantaneous active power difference of each sampling point in each power frequency cycle, and combined with the effective value of the current, obtain the static equivalent resistance of the contactor contacts in each power frequency cycle.

[0031] It should be noted that in motor load scenarios, especially when there is a power fluctuation or sudden load change, the motor rotor will generate back electromotive force (EMF), which will mask the actual losses of the switch contacts. This back EMF will cause the voltage amplitude on the load side to remain unchanged, but the voltage will lag behind the current in phase. If the impedance is simply calculated by dividing the voltage difference by the current, the phase difference between the voltage and the current will be incorrectly included in the impedance calculation value, forming a false high impedance, which will ultimately lead to serious misjudgment of the contact status. However, according to AC power theory, back EMF mainly involves the exchange of reactive power. Therefore, this invention only extracts the active power loss part in the circuit (the actual loss generated by the contact resistance) and automatically filters out the reactive interference of motor back EMF and line reactance. Next, the average power loss during the power frequency cycle is divided by the square of the effective value of the current to directly calculate the total equivalent resistance of all resistive components in the circuit from the circuit breaker to the contactor. Then, the inherent impedance reference value of the wire between the circuit breaker and the contactor is subtracted to obtain the static equivalent resistance of the contactor contacts during the power frequency cycle. This completely avoids the miscalculation problem caused by phase lag and achieves accurate quantification of the actual contact state of the contacts.

[0032] In this embodiment of the invention, the root mean square value of the current value at all sampling points on the incoming side of the circuit breaker during the t-th power frequency cycle is calculated and used as the effective value of the current during the t-th power frequency cycle. Obtain the static equivalent resistance of the contactor contacts during the t-th power frequency cycle: ; In the formula, The static equivalent resistance represents the t-th power frequency cycle, and its value directly corresponds to the contact state of the contact point. This represents the mean of the instantaneous active power differences among all sampling points within the t-th power frequency cycle; This represents the effective value of the current during the t-th power frequency cycle; This represents a preset hyperparameter used to avoid a denominator of 0. In this embodiment of the invention, the preset hyperparameter is... In other embodiments, implementers may pre-set according to specific implementation conditions. The value; This represents the pre-calibrated reference value of the inherent impedance of the conductor between the circuit breaker and the contactor. This reflects the average active power loss within the circuit during the t-th power frequency cycle. Since the active power done by the back electromotive force component is zero during the complete cycle, they are naturally canceled out during the summation process. Therefore, the remaining non-zero values ​​are generated only by purely resistive elements. Dividing by the square of the effective current value yields the pure resistance value, allowing us to separate the resistance component from the mixed impedance that is only related to the contactor contact state.

[0033] It should be noted that, Figure 2 This is a schematic diagram comparing the impedance calculation effect of the present invention based on the instantaneous active power difference with that of the traditional voltage difference method. In the back EMF interference region of the power sway, the traditional voltage difference method will obtain a higher impedance, while the present invention maintains the true value of the static equivalent resistance in the back EMF interference region of the power sway.

[0034] S3: Based on the difference in instantaneous active power at each sampling point within each power frequency cycle and the average of the difference in instantaneous active power at all sampling points within each power frequency cycle, obtain the micro-arc risk index for each power frequency cycle.

[0035] It should be noted that the static equivalent resistance only reflects the reduction or oxidation of the macroscopic contact surface of the contact point, and has a significant detection lag. If the contact point experiences vibration or slight loose connection in the early stages, high-frequency micro-separation will occur on the contact surface, generating a high-energy micro-arc. This phenomenon manifests in the time domain as extremely high amplitude pulse spikes in the instantaneous active power difference sequence. At this time, the static equivalent resistance of the contact point has not yet increased significantly, but the high-temperature plasma of the arc has already begun to continuously erode the contact surface. If the static equivalent resistance is used for judgment alone, these millisecond-level extremely short arc pulses will be averaged and completely submerged, making it impossible to achieve early fault identification. Conventional variance or standard deviation is not sensitive to such outliers, while the fourth-order statistical moment (kurtosis) is highly sensitive to extreme values ​​at the tail of the distribution. Therefore, this invention introduces a high-order statistical analysis method to accurately quantify the transient spike characteristics of the power difference waveform, thereby capturing the early fault signal of the micro-arc of the contact point and solving the problem of missed detection of hidden faults.

[0036] In this embodiment of the invention, the micro-arc risk index for the t-th power frequency cycle is obtained: ; In the formula, The micro-arc risk index represents the t-th power frequency cycle; This represents the instantaneous active power difference at the i-th sampling point within the t-th power frequency cycle; This represents the mean of the instantaneous active power differences among all sampling points within the t-th power frequency cycle; This represents the number of sampling points within the t-th power frequency cycle; Numerator The fourth-order central moment representing the differential fluctuation of active power; The second central moment (i.e., variance) represents the differential fluctuation of active power. The denominator is the square of the variance. It is also a kurtosis value, reflecting the peak value of the waveform; When the contacts are in good contact, the thermal noise of the circuit follows a normal distribution with a constant kurtosis value (approximately 3). However, when a micro-arc is generated, an instantaneous pulse maximum will appear in the difference of instantaneous active power at all sampling points in the t-th power frequency cycle. Its distribution exhibits a typical thick-tailed distribution (super-Gaussian distribution) characteristic, which will cause the value of the fourth moment to increase exponentially (kurtosis value greater than 3). Therefore, the micro-arc risk index is only related to the peak value of the waveform and can keenly capture early fault signals of micro-arcs at the contact.

[0037] like Figure 3 As shown, Figure 3The diagram illustrates the dynamic feature extraction of micro-arcs based on statistical kurtosis analysis of this invention. Based on the instantaneous active power difference sequence, it can be seen that the early micro-arcs only manifest as extremely short pulse spikes with weak energy, which are easily submerged by background noise, causing the static equivalent resistance detection method obtained by averaging the instantaneous active power to fail. However, when micro-vibration occurs at the contactor contacts, the micro-arc risk index immediately spikes exponentially from the baseline value of 3.

[0038] S4: Based on the static equivalent resistance, effective current value, and micro-arc risk index of each power frequency cycle, obtain the thermal safety remaining capacity of each power frequency cycle, and issue remote power-off commands to the contactor based on the thermal safety remaining capacity of each power frequency cycle to achieve safe control of the power circuit.

[0039] It should be noted that if the contact only experiences slight heating (slightly higher static equivalent resistance) and no micro-arc erosion occurs, the system can withstand this type of steady-state heat loss and continue to maintain power. However, if slight heating of the contact is accompanied by the generation of micro-arcs (significantly increased micro-arc risk index), it indicates that the contact surface is deteriorating rapidly, and its heat capacity will decrease sharply due to surface oxidation and melting caused by the high temperature of the arc. At this time, the traditional single Joule heat integral can no longer accurately assess the thermal safety risk of the contact. This invention introduces the micro-arc risk index as a factor that accelerates the thermal deterioration of the contact heat accumulation, realizing the coupled assessment of thermal steady-state loss and dynamic micro-arc erosion, taking into account both the continuity of power maintenance and the thermal safety reliability of the contact.

[0040] In this embodiment of the invention, the thermal safety remaining capacity for the t-th power frequency cycle is obtained: ; In the formula, This represents the thermal safety remaining capacity during the t-th power frequency cycle; This represents the maximum permissible heat capacity threshold of the contact material; This represents the total number of historical cycles for the t-th power frequency cycle; The effective value of the current in the k-th historical period represents the t-th power frequency cycle; The static equivalent resistance represents the k-th historical cycle of the t-th power frequency cycle; Represents the duration of the power frequency cycle; The micro-arc risk index represents the t-th power frequency cycle; The acceleration weighting coefficient representing the thermal damage caused by the micro-arc; Represents a logarithmic function; in this embodiment of the invention, a preset... In other embodiments, implementers may pre-set according to specific implementation conditions. The value; If the contacts only slightly heat up, the lower the micro-arc risk index, the better. The value is close to 1, and the system mainly relies on Assess the thermal safety risks of the contacts; If the contacts heat up slightly, the higher the micro-arc risk index, the better. The value is significantly greater than 1, at which point The smaller it is.

[0041] In this embodiment of the invention, when the thermal safety remaining capacity in the t-th power frequency cycle is greater than 0, it indicates that the thermal safety remaining capacity is sufficient. At this time, the contactor continues to remain engaged, and the system operates normally with power supply. When the thermal safety remaining capacity in the t-th power frequency cycle is equal to 0, it indicates that the thermal safety remaining capacity is exhausted and reaches the critical safety threshold. At this time, the system immediately triggers an early warning command to prompt preparation for shutdown. When the thermal safety remaining capacity in the t-th power frequency cycle is less than 0, it indicates that the thermal safety remaining capacity is overdrawn and the thermal risk exceeds the limit. An emergency trip control command is immediately executed to forcibly disconnect the contactor.

[0042] Figure 4 This is a schematic diagram of the anti-power flicker safety boundary control logic provided by the present invention, which uses a thermal-arc dual-dimensional weight. Before 0.25 seconds (no arc), the thermal safety remaining capacity decreases slowly and linearly with the current thermal effect, allowing for a longer period of operation. However, after 0.25 seconds (micro-arc occurs), due to the introduction of the micro-arc risk index, the slope of the safety remaining capacity suddenly becomes steep (a cliff-like drop). This proves that the present invention does not passively wait for the thermal capacity to be exhausted, but actively accelerates the fault clearing when a micro-arc is detected, thereby forcibly disconnecting the circuit before irreversible physical damage occurs, achieving the highest level of safety control.

[0043] This invention also discloses a remote power outage and restoration system based on multi-dimensional monitoring and control of power circuits, including a processor and a memory. The memory stores computer program instructions, and when the computer program instructions are executed by the processor, the remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits provided by this invention is implemented.

[0044] The system also includes other components well-known to those skilled in the art, such as communication buses and communication interfaces, the setup and functions of which are known in the art and will not be described in detail here. In this invention, the aforementioned memory can be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device.

[0045] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits, characterized in that, include: Collect the voltage and current sequences of the circuit breaker incoming side and the contactor outgoing side within each power frequency cycle; Based on the instantaneous power input on the incoming side of the circuit breaker and the instantaneous power output on the outgoing side of the contactor, the instantaneous active power difference at each sampling point within each power frequency cycle is obtained. Based on the current values ​​of all sampling points on the incoming side of the circuit breaker in each power frequency cycle, the effective current value for each power frequency cycle is obtained. Based on the instantaneous active power difference at each sampling point within each power frequency cycle, and combined with the effective current value, the static equivalent resistance of the contactor contacts for each power frequency cycle is obtained; based on the instantaneous active power difference at each sampling point within each power frequency cycle, the micro-arc risk index for each power frequency cycle is obtained. Based on the static equivalent resistance, the effective value of the current, and the micro-arc risk index, the thermal safety remaining capacity for each power frequency cycle is obtained; the remote power supply and shutdown of the contactor is controlled based on the thermal safety remaining capacity for each power frequency cycle to achieve safe management and control of the power circuit.

2. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 1, characterized in that, The step of obtaining the instantaneous active power difference at each sampling point within each power frequency cycle includes: ； In the formula, This represents the instantaneous active power difference at the i-th sampling point within the t-th power frequency cycle; This represents the voltage value of the circuit breaker's incoming side at the i-th sampling point during the t-th power frequency cycle; This represents the current value on the incoming side of the circuit breaker at the i-th sampling point during the t-th power frequency cycle; This represents the voltage value at the i-th sampling point on the outgoing side of the contactor during the t-th power frequency cycle; represents the current value of the contactor's outgoing side at the i-th sampling point during the t-th power frequency cycle; || represents the absolute value sign.

3. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 1, characterized in that, The process of obtaining the effective current value for each power frequency cycle includes: For the current values ​​on the incoming side of the circuit breaker at all sampling points during the t-th power frequency cycle, calculate their root mean square value, which is taken as the effective value of the current during the t-th power frequency cycle.

4. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 1, characterized in that, The process of obtaining the static equivalent resistance of the contactor contacts for each power frequency cycle includes: ； In the formula, The static equivalent resistance represents the t-th power frequency cycle, and its value directly corresponds to the contact state of the contact point. This represents the mean of the instantaneous active power differences among all sampling points within the t-th power frequency cycle; This represents the effective value of the current during the t-th power frequency cycle; This represents the preset hyperparameters used to avoid a denominator of 0; This represents the pre-calibrated reference value of the inherent impedance of the conductor between the circuit breaker and the contactor.

5. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 1, characterized in that, The process of obtaining the micro-arc risk index for each power frequency cycle includes: ； In the formula, The micro-arc risk index represents the t-th power frequency cycle; This represents the instantaneous active power difference at the i-th sampling point within the t-th power frequency cycle; This represents the mean of the instantaneous active power differences among all sampling points within the t-th power frequency cycle; This represents the number of sampling points within the t-th power frequency cycle.

6. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 1, characterized in that, The process of obtaining the thermal safety remaining capacity for each power frequency cycle includes: ； In the formula, This represents the thermal safety remaining capacity during the t-th power frequency cycle; This represents the maximum permissible heat capacity threshold of the contact material; This represents the total number of historical cycles for the t-th power frequency cycle; The effective value of the current in the k-th historical period represents the t-th power frequency cycle; The static equivalent resistance represents the k-th historical cycle of the t-th power frequency cycle; Represents the duration of the power frequency cycle; The micro-arc risk index represents the t-th power frequency cycle; The acceleration weighting coefficient representing the thermal damage caused by the micro-arc; This represents the logarithmic function.

7. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 1, characterized in that, The remote power-on / off control of the contactor based on the thermal safety remaining capacity for each power frequency cycle includes: When the thermal safety remaining capacity in the t-th power frequency cycle is greater than 0, the contactor continues to be engaged, and the system operates normally with power supply; when the thermal safety remaining capacity in the t-th power frequency cycle is equal to 0, the system immediately triggers an early warning command to prompt preparation for shutdown; when the thermal safety remaining capacity in the t-th power frequency cycle is less than 0, an emergency trip control command is immediately executed to forcibly disconnect the contactor.

8. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 1, characterized in that, The acquisition of voltage and current sequences on the incoming and outgoing sides of the circuit breaker and contactor within each power frequency cycle includes: Based on sampling time interval In addition to the preset power frequency cycle duration, the system simultaneously collects the voltage and current data of the circuit breaker incoming side at each sampling point under each power frequency cycle, as well as the voltage and current data of the contactor outgoing side at each sampling point under each power frequency cycle, to obtain the voltage and current sequences of the circuit breaker incoming side and the contactor outgoing side under each power frequency cycle.

9. The remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to claim 8, characterized in that, The acquisition of the sampling time interval includes: The preset power frequency cycle duration is The preset number of sampling points per power frequency cycle is 1. Sampling time interval .

10. A remote power outage and restoration system based on multi-dimensional monitoring and control of power circuits, characterized in that, include: A processor and a memory, wherein the memory stores computer program instructions, which, when executed by the processor, implement the remote power outage and restoration method based on multi-dimensional monitoring and control of power circuits according to any one of claims 1-9.

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