Dual-mode-based low-voltage power grid state information management method and system

Abstract

The invention provides a dual-mode-based low-voltage power grid state information management method and a dual-mode-based low-voltage power grid state information management system, belongs to the field of power line carrier communication, and solves the problem that the bit error rate is still high in some scenes. The method comprises the following steps: acquiring control harmonic characteristic parameters of grid-connected inverter equipment in a transformer area and physical layer state parameters of a high-speed power line carrier communication channel in the high-speed power line carrier communication channel; on a concentrator side or an edge node side, constructing an error rate risk assessment model based on the control harmonic characteristic parameters and the physical layer state parameters so as to identify a link risk state in which feedforward gain limitation and spectrum migration need to be executed; the method comprises the following steps: under the condition of determining that a control harmonic wave causes selective desensitization of a high-speed power line carrier communication front end based on a link risk state, applying feed-forward gain limitation to a high-speed power line carrier communication channel, and migrating a high-risk subcarrier to a low-risk frequency band; and a bypass relay path is established through the high-speed wireless radio frequency communication channel so as to transmit key data in the execution period.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power line carrier communication, and in particular to a low-voltage power grid state information management method and system based on a dual mode. BACKGROUND

[0002] Under the dual-mode communication framework of HPLC (High-speed Power Line Communication) and HRF (High-speed Radio Frequency), the low-voltage distribution network state information management has both on-site access relying on the existing distribution line and flexible coverage capability for end-use scenarios: on the one hand, the power line can quickly lay out voltage / current, power quality, power flow and topology state data collection and backhaul within the transformer substation, and maintain good pipeline adaptability when passing through complex environments such as walls, shafts and metal cabinets within the transformer substation; on the other hand, the wireless radio frequency link can still maintain stable reporting during sensitive interference periods such as phase zero crossover, and has natural bypass capability for narrow-band traps caused by power line channel blockage, coupling point aging, end filter, impedance mutation caused by load disturbance, and topology changes caused by construction and reconstruction, thereby improving the redundancy and anti-interference level in terminal dense access, distributed power grid connection, energy storage and electric vehicle charging scenarios. Through dual-mode cooperation, the system can balance between low latency and wide coverage, link optimization and load sharing under different business priorities, reduce transformation cost and maintenance complexity, and meet the comprehensive requirements of reliability, continuity, scalability and economy on the low-voltage distribution side. However, there is still a problem of high bit error rate in some scenarios. SUMMARY

[0003] The embodiments of the present application provide a low-voltage power grid state information management method and system based on a dual mode, which can solve the problem of high bit error rate in some scenarios.

[0004] The first aspect of the embodiments of the present application provides a low-voltage power grid state information management method based on a dual mode, comprising: collecting control harmonic characteristic parameters of grid-connected inverter equipment in a transformer substation and physical layer state parameters of a high-speed power line carrier communication channel in the high-speed power line carrier communication channel, the control harmonic characteristic parameters including at least one of switching frequency, combined frequency, amplitude and phase, and the physical layer state parameters including automatic gain control operating point, noise baseline and subcarrier bit error rate; constructing a bit error rate risk assessment model based on the control harmonic characteristic parameters and the physical layer state parameters at the concentrator side or the edge node side to identify the link risk state that needs to perform feedforward gain limitation and spectrum migration; In the case that the control harmonic causes the high-speed power carrier communication front end to be selectively desensitized based on the link risk state, a feedforward gain limit constraint is applied to the working range of the automatic gain control of the high-speed power carrier communication channel, the high-risk subcarriers are migrated to a low-risk frequency band, and a bypass relay path is established through the high-speed wireless radio frequency communication channel to transmit critical data during the spectrum migration and feedforward gain limit.

[0005] Optionally, a bit error rate risk assessment model is constructed based on the control harmonic characteristic parameters and the physical layer state parameters at the concentrator side or the edge node side to identify the link risk state that needs to perform feedforward gain limit and spectrum migration, including: A bit error rate risk assessment model is constructed based on the control harmonic characteristic parameters and the physical layer state parameters at the concentrator side or the edge node side; A crisis time window for the high-speed power carrier communication channel is generated based on the bit error rate risk assessment model to demarcate a high-risk subcarrier set; In combination with the crisis time window and the high-risk subcarrier set, the link risk state that needs to perform feedforward gain limit and spectrum migration is identified.

[0006] Optionally, the bit error rate risk assessment model is constructed based on the control harmonic characteristic parameters and the physical layer state parameters, including: The control harmonic characteristic parameters are subjected to time series smoothing processing; An empirical surface model is fitted based on the physical layer state parameters and the processed control harmonic characteristic parameters through spline regression or Gaussian process regression, and the empirical surface model is taken as the risk assessment model.

[0007] Optionally, the crisis time window for the high-speed power carrier communication channel is generated based on the bit error rate risk assessment model to demarcate a high-risk subcarrier set, including: The crisis time window for the high-speed power carrier communication channel is generated based on the bit error rate risk assessment model; The slope of the group delay to the frequency and the impedance spectrum change rate of each subcarrier are obtained based on the physical layer measurement; The joint threshold of the slope of the group delay to the frequency and the impedance spectrum change rate is taken as the subcarrier risk screening basis, and the high-risk subcarrier set is preferentially demarcated within the crisis time window.

[0008] Optionally, the high-speed wireless radio frequency communication channel is configured as a preferential transmission channel for event-type packets within the crisis time window, and the high-speed power carrier communication channel is configured as a transmission channel for periodic and differential quantities within the crisis time window.

[0009] Optionally, the bypass relay path is established through the high-speed wireless radio frequency communication channel to transmit critical data during the spectrum migration and feed-forward gain limitation, comprising: Triggering a low-duty-cycle probe pulse within a grid zero-crossing phase window to measure multipath stability; Based on the measured stability, a relay direction is selected and a bypass relay path is established with a packet transmission time slot to transmit critical data during spectrum migration and feed-forward gain limitation.

[0010] Optionally, it further comprises: In the case where the link risk state is determined to exist control harmonics to cause the high-speed power carrier communication front end to be selectively desensitized, the transmission parameters are dynamically adjusted under the condition of meeting electromagnetic compatibility constraints, the electromagnetic compatibility constraints at least including field strength limitation threshold and sideband leakage threshold; When the sideband leakage is monitored to exceed the constraints, a transmission parameter retreat control is automatically performed to reduce electromagnetic radiation levels and restore them to a compliant range, the transmission parameter retreat control including at least one of reducing transmission power density, reducing the number of subcarriers participating in transmission, reducing transmission duty cycle, and reducing concurrent packet transmission rate; At the same time as the transmission parameter retreat control is executed, event records are generated and stored.

[0011] The second aspect of the embodiments of the present application provides a low-voltage power grid state information management system based on a dual-mode, comprising: A construction unit is configured to learn the power phase in which each terminal is located by carrier coupling in a high-speed power carrier communication channel of a three-phase four-wire power grid, construct a power phase recognition model, and record the communication characteristics of the phase line to which each terminal belongs; An identification unit is configured to identify the link isolation state between different phase lines in combination with a power phase communication map generated by a concentrator based on phase information of each terminal; An optimization unit is configured to execute a preset coordinated packet transmission optimization strategy in the case where the link isolation state is determined to exist a cross-phase communication bottleneck, and establish a different-phase relay path through a high-speed wireless communication channel during the optimization process.

[0012] The third aspect of the embodiments of the present application provides an electronic device, comprising a memory and a processor, the processor being configured to execute a computer program stored in the memory to implement the steps of the low-voltage power grid state information management method based on a dual-mode.

[0013] The fourth aspect of the embodiments of the present application provides a computer readable storage medium having a computer program stored thereon, the computer program being executed by a processor to implement the steps of the low-voltage power grid state information management method based on a dual-mode.

[0014] The grid-connected inverter device generates stable or semi-stable control harmonics and combined frequency components in its current loop, power loop and modulation link, which form narrow-band fluctuations over time and operating conditions on the equivalent impedance of the low-voltage side grid. For high-speed power carrier communication, these fluctuations change the equivalent input impedance and noise baseline of the coupling point, causing the AGC (Automatic Gain Control) to deviate from the optimal operating point and induce an increase in bit error rate near certain subcarriers. This effect presents a regular time and frequency-domain concentrated feature, that is, the risk of bit error rate increases at certain time intervals during periods of rapid adjustment of the inverter controller output voltage vector and in certain narrow frequency bands related to control harmonics and their combined frequencies. In summary, the dual-mode based low-voltage grid state information management method provided in the embodiments of the present application collects control harmonic characteristic parameters of grid-connected inverter devices in the transformer area and physical layer state parameters of the high-speed power carrier communication channel in the transformer area, the control harmonic characteristic parameters including at least one of switching frequency, combined frequency, amplitude and phase, and the physical layer state parameters including automatic gain control operating point, noise baseline and subcarrier bit error rate; at the concentrator side or edge node side, a bit error rate risk assessment model is constructed based on the control harmonic characteristic parameters and the physical layer state parameters to identify the link risk state that needs to perform feedforward gain limitation and spectrum migration; in the case where the high-speed power carrier communication front end selects selective desensitization due to control harmonics based on the link risk state, the working interval of the automatic gain control is constrained by applying feedforward gain limitation to the high-speed power carrier communication channel, high-risk subcarriers are migrated to low-risk frequency bands, and a bypass relay path is established through a high-speed wireless radio frequency communication channel to transmit key data during spectrum migration and feedforward gain limitation. It can be seen that grid-connected inverter devices continuously generate stable or semi-stable control harmonics and narrow-band noise protrusions near the switching frequency and the combined frequency of the switching frequency and the power frequency harmonic, which are loaded onto the equivalent impedance of the low-voltage side grid through the grid-connected point, causing the equivalent input impedance and noise baseline of the communication coupling point to present narrow-band fluctuations over time and operating conditions, thereby causing the automatic gain control at the receiving end to deviate from the nominal operating point and inducing an increase in bit error rate near certain subcarriers. Based on this observable regularity in time segments and frequency-domain aggregation, the inverter control harmonic characteristics and communication physical layer state characteristics are fused at the concentrator or edge node side to construct a subcarrier-oriented bit error risk assessment model, identify the link risk state of selective desensitization, and handle it in three ways within the risk time window to limit the swing interval of the automatic gain control in a feedforward manner, reconfigure and migrate high-risk subcarriers to low-risk frequency bands, and establish a bypass relay for key data through a high-speed wireless radio frequency channel to ensure end-to-end reliability. Therefore, the bit error rate of high-risk subcarriers can be significantly reduced, the automatic gain control behavior can be stabilized, and the key business latency can be ensured within the risk section.

[0015] Correspondingly, the system, the electronic device and the computer readable storage medium provided by the embodiments of the present application also have the above technical effects. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A possible flow diagram of a low-voltage power grid state information management method based on a dual mode provided by an embodiment of the present application; Figure 2 A possible schematic structural block diagram of a low-voltage power grid state information management system based on a dual mode provided by an embodiment of the present application; Figure 3 A possible schematic diagram of the hardware structure of a low-voltage power grid state information management system based on a dual mode provided by an embodiment of the present application; Figure 4 A possible schematic structural block diagram of an electronic device provided by an embodiment of the present application; Figure 5 A possible schematic structural block diagram of a computer readable storage medium provided by an embodiment of the present application. DETAILED DESCRIPTION

[0017] The low-voltage power grid state information management method and related equipment based on a dual mode provided by the embodiments of the present application can solve the problem of high bit error rate in some scenarios.

[0018] The terms "first", "second", "third", "fourth" and the like (if any) in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices. The technical solutions in the embodiments of the present application will be described in detail below with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all embodiments.

[0019] Please refer to Figure 1 A flowchart of a low-voltage power grid state information management method based on a dual mode provided by an embodiment of the present application, which can specifically include: S110-S130.

[0020] S110, collecting control harmonic characteristic parameters of grid-connected inverter equipment in the high-speed power carrier communication channel and physical layer state parameters of the high-speed power carrier communication channel, the control harmonic characteristic parameters including at least one of switching frequency, combined frequency, amplitude and phase, and the physical layer state parameters including automatic gain control working point, noise baseline and subcarrier bit error rate.

[0021] S120, constructing a bit error rate risk assessment model based on the control harmonic characteristic parameters and the physical layer state parameters on the concentrator side or the edge node side, to identify a link risk state requiring feedforward gain limitation and spectrum migration to be performed.

[0022] S130, in a case where it is determined based on the link risk state that the control harmonic causes selective desensitization of the high-speed power carrier communication front end, applying feedforward gain limitation to constrain the working range of automatic gain control of the high-speed power carrier communication channel, migrating high-risk subcarriers to a low-risk frequency band, and establishing a bypass relay path through a high-speed wireless radio frequency communication channel to transmit key data during spectrum migration and feedforward gain limitation.

[0023] It can be understood that, considering that the frequency and amplitude-phase trajectory of the control harmonic have device endogeneity and scenario reproducibility, and the linkage with the physical layer state parameters such as AGC working point, noise baseline and historical subcarrier bit error rate can be fitted by an empirical model. Therefore, a risk assessment model of the control harmonic, AGC working point and bit error rate can be first constructed on the edge or concentrator end, the upcoming high-risk time interval is predicted, and the subcarrier set requiring avoidance or weight reduction is given in advance. When feedforward gain limitation and spectrum migration are performed on the high-speed power carrier communication channel, short-time throughput reduction may affect key reporting. By establishing a bypass relay path through a high-speed wireless radio frequency communication channel, key data is preferentially carried, and service continuity can be maintained during necessary physical layer conservation strategies performed at the carrier end. Since the interference sources and propagation mechanisms of the two media are quite different, they have low correlation in most scenarios, and therefore cooperation can significantly improve overall availability.

[0024] For example, considering the need to synchronously learn the frequency position of the interference source and the communication link at the corresponding frequency point, two-way collection is carried out by the terminal and the concentrator in the station area high-speed power carrier communication channel. One way is to target the control harmonic characteristics of grid-connected inverter equipment, adopt a combination of fine-grained spectrum scanning with a sliding window and narrowband tracking, cover a bandwidth not less than twice the upper limit of the switching frequency, automatically identify the current switching frequency, the main combination frequency set, the amplitude and phase of each frequency point, and establish a time grid according to half a cycle or a whole cycle. The other way is to target the communication physical layer state, continuously record the noise baseline, pilot error vector amplitude, group delay and its frequency slope, real-time working point of automatic gain control and short window error code statistics on each subcarrier, and read the electromagnetic compatibility related field strength and sideband leakage measurement for subsequent spectrum migration constraints. The two-way data is aligned to the same timestamp by interpolation resampling with the power grid zero crossover as the unified reference and is labeled with working condition labels such as inverter power step, maximum power point tracking disturbance and charge-discharge switching, thereby forming a joint sample of time, frequency and working condition. Thus, the subsequent model can ensure that the corresponding relationship between the control harmonic and the physical layer state is compared on a strictly aligned timeline, reducing misjudgment caused by different sampling time bases, and providing fine frequency domain resolution for risk positioning.

[0025] For example, physical prior constraints can be used for statistical learning, so that the model can not only depict the joint influence of control harmonic proximity, amplitude, noise baseline, automatic gain control offset, impedance spectrum change rate, group delay frequency slope and pilot error vector amplitude on error rate, but also avoid overfitting to incidental artifacts. First, collect long-time samples covering multiple real working conditions in the pilot station area, use whether the subcarrier error exceeds the business threshold as a weak label, train a logic model or gradient boosting tree with monotonicity constraints, and determine shape priors such as the risk of increasing control harmonic amplitude, the risk of increasing the frequency proximity of subcarriers and control harmonics, and the risk of increasing the noise baseline. Through cross-validation, select the error risk threshold, automatic gain control offset threshold, noise lifting threshold and impedance spectrum change threshold and other environment adaptive parameter intervals. After going online, small-step calibration is performed in a sliding time window at the edge node, the model parameters are updated moderately, and a confidence threshold and outlier suppression strategy are introduced to avoid drift caused by short-term distortion. In this way, an interpretable and robust online risk scorer can be obtained, which can maintain stable discrimination ability after different seasonal loads and equipment replacement, and can directly give a risk ranking with subcarriers as the granularity.

[0026] Exemplarily, the risk scores of individual subcarriers can be aggregated into a link-level alarm that can trigger operation and maintenance actions, and a section detection can determine a bounded risk time window, thereby reducing invalid disturbance to communication resources. In implementation, a high-risk subcarrier set and an occupancy ratio are calculated at each time slice, while a continuous threshold-exceeding duration and a consistency index of adjacent frequency points are calculated. Only when the high-risk subcarrier occupancy ratio exceeds a set proportion, the continuous threshold-exceeding duration reaches a minimum duration, and adjacent subcarriers exhibit an aggregation feature in the frequency domain, is it determined that a link risk state is entered. To locate the section boundary, a Bayesian section detection or a double-threshold method with hysteresis is used to divide the risk occupancy ratio and consistency curve into paragraphs, obtain a start time and an end time, and output a high-risk subset ranked by risk intensity and a recommended handling priority. In this way, scattered subcarrier anomalies are condensed into a clear risk event, forming an output form of a start time, an end time, and a high-risk frequency band, providing accurate timing and target set for subsequent feedforward restriction, spectrum migration, and bypass relay triggering.

[0027] Exemplarily, when some narrowband frequency point noise spikes, if automatic gain control is allowed to follow quickly, the effective signal-to-noise ratio of other frequency points in the full band will be sacrificed, and overall bit error fluctuation will be caused, so it is necessary to limit the gain interval and step speed of automatic gain control in the risk time window through a feedforward manner, so that it slowly adjusts only within a range that does not harm the demodulation quality of low-risk frequency bands. The allowed automatic gain control target interval and step upper limit can be calculated based on the low-risk subcarrier set in a short transition period before the risk starts, and the results can be issued to the automatic gain control interface of the terminal through the concentrator, setting the maximum step, minimum step, and convergence interval of the target power threshold, so that the automatic gain control slowly adjusts within the interval and avoids saturation or clipping, while monitoring the real-time signal-to-noise ratio floor and pilot error vector magnitude of low-risk subcarriers. If the floor is approaching, the interval is actively expanded or the step is relaxed to ensure the demodulation quality. In this way, the variance of automatic gain control in the risk time window can be significantly reduced, the demodulation performance of low-risk frequency bands can be stabilized, and the performance sacrifice of the full band caused by following narrowband noise can be avoided.

[0028] Exemplarily, after identifying the stable or semi-stable narrowband high-risk sub-carrier, the bit loading, power allocation and pilot layout can be re-planned by comparing the noise baseline, adjacent area occupation and electromagnetic compatibility constraints of the available low-risk frequency band, and the high-risk sub-carrier is mapped to the low-risk area while ensuring the control plane signaling and time synchronization continuity. That is, the concentrator can predict the noise baseline of all candidate frequency bands according to recent observations, exclude frequency bands that are occupied by adjacent areas or do not meet electromagnetic compatibility restrictions, select a safe frequency band set, generate a new tone mask and bit loading table based on the principle of prioritizing control plane and key service bearing, and gradually take effect in multiple frame periods in the order of control plane first and data plane second, and set the minimum residence time and migration interval to avoid convergence jitter caused by frequent switching. For the secondary risk subset that only needs to be avoided for a short time, light strategies such as reduced-order modulation, enhanced pilot and temporary power backoff are used, and there is no need to migrate immediately. When the risk is removed, the original configuration is restored according to the predetermined fallback strategy. In this way, the impact of high-risk frequency bands on key loads is minimized, while considering the boundaries of adjacent area cooperation and electromagnetic compatibility, and the spectrum utilization efficiency and stability in complex radio frequency environment are improved.

[0029] Exemplarily, in the transition period when spectrum migration and feedforward restrictions are still in effect, key small-volume messages may still be affected by residual risks, so necessary control instructions and confirmation information are carried through a physically independent high-speed wireless radio frequency channel within the risk time window to reduce end-to-end latency and loss probability. When entering the risk state, the concentrator selects only key types such as meter reading control, protection-related and time synchronization into the bypass queue according to the message category whitelist, and uses low-duty-cycle probe pulses on the wireless side to maintain link reachability and power adaptive upper limit, strictly meeting field strength restrictions and sideband leakage thresholds. On the scheduling side, short messages that are time-limited sensitive to single packets are prioritized, and retransmission upper limit and timeout fallback strategies are set. The criterion for ending the bypass is that the risk is removed and the main link retransmission statistics are reset. During this period, a consistency check and necessary repeated distribution are performed on key messages transmitted through the bypass after the main link is restored. It can significantly reduce the loss and queuing delay of key messages during the risk period, and realize rigid guarantee of service continuity, while avoiding additional interference to the surrounding wireless environment through duty cycle and power upper limit control.

[0030] Exemplarily, the above detection, decision and treatment processes can be included in a traceable and measurable operation and maintenance closed interval to ensure that electromagnetic compatibility, adjacent area coordination and data consistency requirements are continuously met; when implemented, the concentrator retains full-link records of risk detection, parameter thresholds, treatment actions and effect evaluation, and periodically generates reports for operation and maintenance comparison, while performing electromagnetic compatibility self-check on spectrum migration and wireless bypass actions, and actively reducing power or shortening residence time if it is found that the field strength or sideband leakage is close to the threshold. The interface with external systems adopts consistent encryption and authentication strategies, and the key messages of the bypass and main link are introduced with idempotent identifiers to ensure the correct merging of repeated deliveries, and all thresholds and strategy parameters can be remotely updated under permission control and support gray release. In this way, the long-term operability and compliance of the method can be ensured, the cost of manual inspection can be reduced, and the basis for subsequent parameter optimization can be provided.

[0031] In some examples, the control harmonic feature parameters and the physical layer state parameters are used to construct a bit error rate risk assessment model on the concentrator side or the edge node side to identify a link risk state that needs to perform feedforward gain limitation and spectrum migration, including: The control harmonic feature parameters and the physical layer state parameters are used to construct a bit error rate risk assessment model on the concentrator side or the edge node side; A crisis time window for the high-speed power carrier communication channel is generated based on the bit error rate risk assessment model to demarcate a high-risk subcarrier set; The crisis time window and the high-risk subcarrier set are combined to identify a link risk state that needs to perform feedforward gain limitation and spectrum migration.

[0032] Exemplarily, the control harmonics introduced by grid-connected inverter devices can be mapped to the risk score of each sub-carrier in terms of the concentration of the combined frequency in the frequency domain, and the narrowband equivalent impedance fluctuation and noise rise caused by the change of operating conditions. A light modeling and online inference module is deployed in the concentrator or edge node, and two types of time-synchronized feature streams collected jointly by the terminal and the concentrator are input. One type is the control harmonic feature parameter, including the current switching frequency, the main combined frequency position, the amplitude and phase of each frequency point, the amplitude stability and the drift over time. The other type is the communication physical layer state parameter, including the noise baseline of each sub-carrier, the pilot error vector amplitude, the group delay and its frequency slope, the automatic gain control operating point and its offset, the short window error code statistics and the inter-carrier consistency index. The engineering implementation adopts a logistic model with shape prior or gradient boosting tree, and explicitly injects three types of monotonic prior, i.e., the greater the control harmonic amplitude, the higher the risk; the closer the frequency of the sub-carrier to the control harmonic, the higher the risk; and the higher the noise baseline, the higher the risk. The half or full cycle aligned with zero crossing is used as the time grid. The parameters and thresholds are calibrated offline with multi-condition samples in the pilot area, and then online with a sliding window to adapt to the season and device replacement. The model output is the risk score and confidence of each sub-carrier, and the feature contribution is recorded for operation and maintenance explanation. An interpretable, online updateable, and robust to artifacts sub-carrier level risk metric can be obtained, which can stably reflect the time segment and frequency domain interference law, thereby providing reliable input for subsequent window generation and scheduling decision. The instantaneous sub-carrier risk score can be condensed into a risk section with clear start and end boundaries, so that the gain constraint and spectrum reconfiguration take effect at the accurate time and range. The risk scores of continuous time slices are aggregated at the edge node. First, four evidence quantities are calculated, i.e., the proportion of high-risk sub-carriers, the frequency domain aggregation degree, the continuous threshold time length, and the synchronization of automatic gain control offset. Only when the proportion exceeds the set proportion and there is a minimum duration, and the frequency domain aggregation degree reaches the threshold and is synchronized with the automatic gain control offset, the candidate crisis section is entered. Then, the rising boundary and falling boundary are found on the time axis by using the double threshold method with hysteresis or Bayesian section detection, to obtain the start time and end time of the crisis time window. Meanwhile, the high-risk sub-carrier set and the second high-risk set are determined according to the risk score ranking and the frequency domain connectivity in the window, and the risk level, the recommended action priority, and the expected duration are attached to each set. To avoid excessive triggering, the window length is set to an upper limit and a cooling time is introduced, and the adjacent area occupation, electromagnetic compatibility field strength, and sideband leakage measurement are used as external constraints of the spectrum action in the window and are cached. A structured and executable crisis window and high-risk frequency band association result can be formed, which reduces unnecessary intervention on stable periods and improves the accuracy of capturing short but strong risk sections. Moreover, in the case of time and frequency double constraints, the light risk that only needs gain constraint and the heavy risk that must be migrated and may enable bypass can be distinguished, so that the resource input and risk intensity are matched.On the same time base of window triggering, the signal-to-noise ratio floor of low-risk subcarriers in the window and the pilot error vector magnitude stability can be calculated first to evaluate whether the high-risk frequency bands can suppress the dragging effect on the full band under the condition of not damaging the demodulation quality of low-risk frequency bands if the automatic gain control step is narrowed and the target interval is reduced: if the low-risk floor is sufficient and the high-risk set size is small, distributed or expected to be short in duration, it is marked as a link risk state with priority of feedforward gain limitation, and the allowed interval, maximum step, minimum step and target power threshold of automatic gain control are immediately issued, and the high-risk set is temporarily reduced in order modulation and encrypted pilot measurement; if the high-risk set size is large, continuous clusters in the frequency domain and the expected duration exceeds the threshold, or the low-risk floor has approached the boundary, it is marked as a link risk state for performing spectrum migration, and a safe frequency band is selected according to noise baseline prediction, neighbor occupation and electromagnetic compatibility constraints, a new tone mask and bit loading table are generated and take effect in the control plane in priority order, while triggering high-speed wireless radio bypass relay for critical thin messages, setting end-to-end time limit and retransmission upper limit. The criterion for state release is that the risk occupation falls and the automatic gain control offset, noise baseline and pilot error vector magnitude recover to the median value of the statistical interval, and then the original configuration is restored according to the predetermined rollback strategy and the bypass statistics are zeroed. Thus, the decisions of whether to limit gain, whether to migrate and whether to enable bypass are strongly bound to the window and frequency band quantization, which not only avoids excessive migration and resource waste, but also significantly reduces the bit error and end-to-end delay fluctuation during high-risk periods, ensuring the continuity of critical services and not breaking the electromagnetic compatibility boundary.

[0033] In some examples, the constructing a bit error rate risk evaluation model based on the control harmonic feature parameter and the physical layer state parameter comprises: performing time series smoothing processing on the control harmonic feature parameter; fitting an empirical surface model based on the physical layer state parameter and the processed control harmonic feature parameter through spline regression or Gaussian process regression, and taking the empirical surface model as the risk evaluation model.

[0034] The control harmonics of the exemplary grid-connected inverter device fluctuate in a narrow frequency band with operating conditions, and these fluctuations affect the bit error rate of the subcarriers through the low-voltage side equivalent impedance and noise baseline. To convert this time-segmented and frequency-domain aggregated observable pattern into a calculable risk metric, the control harmonic characteristics are first time-series smoothed to suppress measurement noise and short-lived spurious peaks, then aligned with the communication physical layer state parameters on a unified time base and frequency grid, and then fitted with a spline regression or Gaussian process regression to obtain an empirical surface with control harmonics and physical layer states as independent variables and subcarrier bit error rate risk as the response. This empirical surface is used as an online risk assessment model. The final model outputs subcarrier-level risk scores and uncertainties, which can be used to trigger feedforward gain limiting and spectrum migration handling actions. The technical effect is reflected in more stable and accurate risk window identification, and the false positive and false negative rates are significantly reduced.

[0035] In some examples, the generating, based on the bit error rate risk assessment model, a crisis time window for the high-speed power carrier communication channel to demarcate a high-risk subcarrier set comprises: The generating, based on the bit error rate risk assessment model, a crisis time window for the high-speed power carrier communication channel; Based on physical layer measurements, the slope of the group delay to frequency and the change rate of the impedance spectrum of each subcarrier are obtained; The joint threshold of the slope of the group delay to frequency and the change rate of the impedance spectrum is used as the basis for subcarrier risk screening, and the high-risk subcarrier set is preferentially demarcated within the crisis time window.

[0036] The control harmonics of an exemplary grid-connected inverter device create a predictable narrowband risk segment in time and frequency for the high-speed power carrier communication channel, and the error code rate risk assessment model provides a continuous risk score trajectory with time slices as granularity. However, to convert the model score into executable actions, the discrete high-score segments on the time axis need to be condensed into crisis time windows with clear start and end boundaries, and further filtered inside the windows with two types of derived indicators that can reflect the physical layer dispersion and port matching changes, so as to accurately lock the subcarrier set that truly needs to be migrated or demodulated with reduced modulation. By windowing the time first and then using the slope of group delay with frequency and the change rate of impedance spectrum with frequency for secondary filtering, the false triggering and resource waste can be significantly reduced, and the response accuracy and timeliness when the interference occurs can be improved. The subcarrier risk scores of continuous time slices can be aggregated in time and frequency domains to identify risk segments with clear boundaries, so that subsequent handling can be focused on the truly dangerous period. The full-band score matrix output by the model can be read in half or whole cycles as a grid at the concentrator or edge node, and the proportion of high-risk subcarriers in each time slice, the consistency of adjacent frequency points, the rising speed and duration of the score curve are calculated, and are synchronized with the side evidence such as automatic gain control offset and noise baseline lifting for judgment. Only when the proportion exceeds the preset proportion and the duration reaches the minimum threshold, and the adjacent frequency points show continuous aggregation and the side evidence changes in the same direction, the time slice is integrated into the candidate segment; then the double-threshold method with hysteresis or the segment detection algorithm is applied to the candidate segment to determine the rising and falling boundaries, and the intensity level, expected duration and cooling period are calculated for each determined crisis window, and repeated triggering is inhibited during the cooling period; the output is a crisis window list with start time, end time and intensity level, with statistical summary and side evidence overview of the scores in the window. In this way, unnecessary intervention on stable periods can be significantly reduced, and subsequent spectrum migration or feedforward restriction can be executed only in truly needed segments, thereby reducing network disturbance and recovery time. The slope of group delay with frequency can sensitively reflect small changes in dispersion and multipath structure, and the change rate of impedance spectrum with frequency can sensitively reflect narrowband fluctuations in coupling point matching and load conditions, both of which together depict the physical layer anomalies that can cause demodulation vulnerability. Inside each identified crisis window, the terminal can be instructed to perform fine-grained pilot measurement and short detection scan while maintaining service bearing, extract the group delay sequence of each subcarrier and calculate the frequency slope between adjacent frequency points without changing the existing network modulation configuration, and obtain the discrete spectrum of coupling point impedance with frequency by using the calibrated port test sequence or inverting the pilot response, and then calculate the change rate between adjacent frequency points. To ensure robustness, the two types of discrete derived indicators are processed with windowed robust smoothing and de-extreme value, and the measurement confidence and data missing markers are recorded for each subcarrier. The output is the two derived indicators and their confidence vectors for all subcarriers in the window.Thus, the model score, a statistical quantity, can be verified and strengthened by directly interpretable physical layer evidence, making the subsequent risk screening closer to the actual link's bearability, thereby reducing the false screening caused by statistical fluctuations. Considering that high error codes often accompany significant increases or rapid changes in dispersion and deterioration of port matching, a single indicator may be affected by accidental artifacts, while a joint threshold can improve accuracy while ensuring recall. All subcarriers in the crisis window can be standardized according to the two derived indicators, and the abnormal points can be down-weighted according to their confidence, and then a joint criterion is used for screening, such as requiring both indicators to exceed their respective thresholds, or identifying high risk when the weighted combination exceeds the threshold while meeting the adjacent frequency point connectivity condition, and subcarriers with only one indicator exceeding the threshold but with high intensity are classified into the next high risk to take downgrading or power backoff instead of immediate migration. To avoid threshold rigidity, an adaptive fine-tuning strategy driven by window intensity level and model score uncertainty is introduced, and the joint threshold is appropriately lowered for strong risk windows to improve recall, and the threshold is appropriately raised for weak risk windows to suppress false positives; the output is a set of subcarriers stratified by risk level and corresponding handling recommendations and priorities, including migration candidates, downgrading candidates, and observation candidates. In this way, all subcarriers in the crisis window are treated as one size fits all, and only the subset pointed to by physical evidence is accurately handled, thereby significantly reducing error codes and end-to-end latency fluctuations in the risk section, while controlling the size of spectrum migration and the amplitude of automatic gain control to the minimum necessary range.

[0037] In some examples, the high-speed wireless radio frequency communication channel is configured as a priority transmission channel for event-type messages within the crisis time window, and the high-speed power line carrier communication channel is configured as a transmission channel for periodic and differential quantities within the crisis time window.

[0038] For example, within the crisis time window, the power line carrier link is more susceptible to selective desensitization caused by controlled harmonics and combined frequencies in the narrowband frequency domain, and short-time errors and retransmissions can amplify end-to-end latency, while event-type messages usually have strong real-time performance and high value density, so they need to be migrated from the more disturbed and sensitive carrier link to a physically independent and faster converging high-speed wireless radio frequency channel. At the same time, a large amount of regular data in the substation belongs to weak real-time periodic quantities and changeable differential encoding, which is not sensitive to instantaneous latency and has higher tolerance to bandwidth and packet arrival order, and is suitable for being carried on the power line carrier link to reduce retransmission pressure through periodic packaging and differential transmission. The role division of event going to radio frequency and periodic and differential going to carrier concentrates limited reliability guarantee resources on the most critical load, significantly reducing end-to-end latency and loss probability of critical control and alarms within the crisis window, while suppressing network congestion and unnecessary frequent migration.

[0039] In some examples, the bypass relay path is established through the high-speed wireless radio frequency communication channel to transmit critical data during the spectrum migration and feed-forward gain limitation, including: Triggering a low-duty-cycle probe pulse within a grid zero-crossing phase window to measure multipath stability; Selecting a relay direction and a packet transmission time slot based on the measured stability to establish a bypass relay path to transmit critical data during the spectrum migration and feed-forward gain limitation.

[0040] It can be understood that during the transition period of spectrum migration and feed-forward gain limitation, the capacity and stability of the power carrier link are temporarily reduced, and critical small-volume messages such as control confirmation, protection triggering, parameter distribution, and clock alignment must be guaranteed in terms of time limit and arrival rate. Therefore, a physically independent high-speed wireless radio frequency bypass is enabled within the crisis time window. To keep the bypass reliable at a minimum power and duty cycle, a low-duty-cycle probe pulse is first sent within a grid waveform zero-crossing phase window to measure the multipath stability of the wireless channel, and then the spatial direction and time slot of the relay are adaptively selected based on the stability to establish a lightweight bypass relay that only carries critical data. This can bypass the narrowband desensitization of the carrier link, meet the constraints of electromagnetic compatibility and adjacent area cooperation, and make the tail delay of critical messages converge, the first arrival rate rise, and the radiation occupancy and energy consumption of the bypass to the environment controllable.

[0041] For example, the electrical noise in the substation near the grid zero-crossing and the coupling condition are more predictable, and the selection of the phase window for transmitting short pulses or short training sequences can obtain representative instantaneous channel responses without disturbing the service. The concentrator issues a window trigger order, and the terminal or candidate relay node sends a probe pulse with a duty cycle not exceeding a preset threshold in the zero-crossing phase window of each half cycle or whole cycle. The pulse can carry a short training sequence and a unique marker. The receiving side extracts the instantaneous time delay distribution, main path power, path number, and relative power ratio with high sampling rate correlation. Align with the previous measurement period, calculate the correlation coefficient between adjacent measurements, the main path time delay drift amplitude, whether the path power ranking has jumped, and the change of power concentration, etc. Indexes, and summarize these indexes into a multipath stability score, with a confidence label such as considering signal-to-noise ratio, frame loss, and clock jitter. The output is a time-stamped multipath stability sequence and a measurement snapshot of each candidate pointing. In this way, with very small air interface overhead, an operational channel availability metric is obtained, providing a basis for subsequent pointing selection and time slot selection, while meeting the strict control requirements of external radiation duty cycle. Considering that space pointing and time segments with high stability can provide higher link consistency and lower retransmission probability, adaptive selection should be done in both space and time dimensions. In implementation, the stability obtained in the previous step is organized into a scoring matrix according to candidate relay pairs, candidate antenna pointing, and candidate packet sending time slots. First, eliminate combinations that do not meet electromagnetic compatibility field strength restrictions or sideband leakage constraints. Then, sort the remaining combinations by stability, historical packet loss record, neighboring area occupation prompt, node remaining power, and queue length. Select the top several candidate solutions, and issue the primary and backup solutions to the relevant nodes at the same time, set the effective time and retention period. Within the retention period, if real-time monitoring shows that the stability has fallen rapidly or the number of retransmissions has exceeded the limit, seamlessly switch to the next solution according to the pre-calculated backup order. The output is the current effective relay path pointing, packet sending time slot, and retention strategy. Without increasing the transmission power and duty cycle, the instantaneous availability can be significantly improved, and the number of retransmissions and queuing delay can be reduced to a low level, and smooth switching can be achieved through pre-set backup. The determined space and time configuration can be fixed as a lightweight bypass, which only carries key messages and maintains consistency and idempotency with the main link. In implementation, the concentrator issues a white list of key data categories to the relevant nodes, and the bypass link only receives event class messages and security confirmation messages in the white list. All messages are accompanied by a globally unique identifier, timestamp, and idempotency level. Short load frames and fast acknowledgement procedures are used, with a single packet cutoff time and a maximum number of retransmissions. If the time limit is exceeded, switch to the backup solution or fall back to the main link for retry. To prevent data inconsistency between the bypass and the main link, a delivery receipt is generated immediately after the bypass is successfully delivered, and the main link performs an account reconciliation and cleans up duplicates once it is stable. The transmission power and duty cycle are strictly limited and monitored in real time during the entire bypass period, and any sign of approaching the threshold triggers power reduction or delays low-priority tasks.After the crisis window is removed and the main link statistics are stable, the bypass is exited by the automatic fallback logic and outputs the arrival rate, retransmission times, switching times and energy consumption summary of this session. The tail delay of key messages in the transition period is significantly reduced, the first arrival rate and on-time completion rate are significantly improved, and the energy consumption of the bypass and the external radiation are kept within the threshold and the exit is smooth without leaving repeated or missing transmission.

[0042] According to some embodiments, further comprising: when temporary low-resistance paths caused by temporary flexible interconnection or cross-zone closing occur in the transformer area, synchronously triggering link detection of the high-speed power carrier communication channel and the high-speed wireless radio frequency communication channel, obtaining the characteristic quantity of the group delay of the power carrier side varying with the frequency and the absolute propagation delay of the wireless radio frequency side; based on the characteristic quantity, clustering and identifying in a two-dimensional fingerprint space, labeling samples meeting the temporary bridging characteristics as a temporary interconnection state, only performing temporary adjustment of routing and bearing during the existence of the state without permanently rewriting the distribution topology account, and restoring to the regular bearing configuration after the temporary interconnection disappears.

[0043] It can be understood that after the detection of abnormal current flow direction or short-time equivalent impedance drop in the power distribution area, the system determines that there may be temporary flexible interconnection or low resistance path formed by closing across the area, and then simultaneously issues link detection instructions to each collection terminal by the concentrator. The terminal side performs narrowband sweep measurement on the high-speed power carrier communication channel, records the change characteristics of the link transmission delay at several discrete frequency points in the frequency dimension, and ensures the comparability of the measurement with fixed transmission power and stable symbol rate, while sending reference detection frames with very low duty cycle on the high-speed wireless radio frequency communication channel. The gateway accurately measures the propagation delay from a specific terminal to the gateway. The edge node splices the change characteristics of the carrier side delay with the frequency into a two-dimensional feature vector and clusters it in a time sliding window. If there are clustered abnormal samples in a certain period, and their mode is highly similar to the temporary bridging template in the historical sample library, it is marked as a temporary interconnection state. During the existence of this state, the system only temporarily adjusts the data bearing and routing strategy: including mapping the key reports on cross-domain paths to the radio frequency channel first, reducing the packet concurrency and repetition degree of carrier messages that may pass through the temporary low resistance path, using edge buffering for data aggregation suspected of crossing the area to reduce the disturbance of topology mutation to the center model, and explicitly prohibiting permanent modification of the area topology account. When the clustering algorithm does not detect abnormal samples continuously for multiple sliding windows, the system automatically removes the temporary label and restores the normal bearing and packet configuration; this method is based on the stability difference of propagation delay in different media and the frequency dispersion and path convergence characteristics caused by temporary interconnection to realize the observability and controllability of short-time topology anomalies, which can reduce the risk of writing temporary state into long-term account, and the accuracy of applications such as fault location, phase clustering or load estimation that rely on topology consistency remains stable during interconnection, the time delay and packet loss of key services during interconnection fluctuation period are significantly controlled, and the operation and maintenance side does not need frequent manual intervention to overcome the uncertainty caused by temporary interconnection.

[0044] According to some embodiments, further comprising: in the case of detecting that the smart circuit breaker fast reclosing causes the branch equivalent impedance to jump in the order of hundreds of milliseconds, setting a short-time alignment tolerance interval for the continuous sampling record, and based on the voltage waveform similarity and zero sequence component change within the tolerance interval, correcting the content consistency of the event sequence to maintain the physical consistency of the event sequence without changing the timestamp reference, and taking the correction result as the input of subsequent risk assessment and bearing scheduling.

[0045] It can be understood that when the intelligent circuit breaker implements fast reclosing, the branch equivalent impedance jumps in the order of hundreds of milliseconds, and the traditional event stream strictly sorted by fixed timestamp will have a short inconsistency where the time identifier does not change but the physical state changes, so the method sets a time alignment tolerance interval of tens to hundreds of milliseconds for the reclosing high-branch on the edge side. Within this interval, the time reference of the uploaded record is not changed, but a content consistency check field is added to the continuous record, including voltage waveform similarity, zero sequence component change amplitude in the same sampling window, adjacent cycle harmonic proportion mutation degree and other explainable features. The edge node performs content consistency correction on the event sequence according to the above features: when it is found that the record that arrives first in time has obvious causal correspondence with the record that arrives later in physical content, the original timestamp is kept but its processing order is adjusted in the event queue, and a reclosing influence label is added to the sequence for subsequent model and scheduling module differential processing. After the corrected event sequence is input into the risk assessment and load scheduling module, false judgment and repeated mitigation actions such as invalid spectrum migration or incorrect priority preemption caused by short window misordering can be avoided. Therefore, the consistency of physical content compensates for the uncertainty in the short window of the timestamp, which significantly reduces the event misordering rate during the reclosing period, significantly reduces the false triggering of protective strategies and unnecessary retransmission, and keeps the correct processing priority of key reports under such disturbance, thereby enhancing the overall stability and interpretability of the system.

[0046] According to some embodiments, further comprising: for repeated sending caused by link instability during power consumption peak period, establishing a retransmission budget and content checking mechanism on the terminal side, wherein each report generates a content-associated check identifier and is cached, and the gateway side returns the stored check identifier set in the receipt; the terminal only sends the reports missing on the gateway side after receiving the receipt; when the waiting time exceeds the preset retransmission budget time limit, the corresponding summary information and key statistics of the time window are sent instead, so as to reduce invalid occupation and maintain the availability of key state quantities.

[0047] For example, to address the problem of implicit excessive retransmission caused by link fluctuation during peak hours, the embodiment generates a content-dependent check identifier for each report at the terminal side and sets a limited-depth cache queue locally, and the gateway side maintains a set of recent successful storage check identifiers and attaches a compact representation of the set such as a segmented bitmap or hash digest in the receipt. The terminal compares the local cache with the gateway set immediately after receiving the receipt and only sends the missing items to eliminate duplicate reports. To further suppress invalid occupation, the terminal configures a retransmission budget time limit. When waiting for a receipt exceeds the time limit, the terminal no longer sends each duplicate, but instead aggregates key statistics such as extreme values, average values, abnormal counts, and time identifiers of the first and last valid samples within the time window to form summary information and uploads it. After the link is restored, the detailed information is supplemented again with low priority. The edge node checks the consistency of the summary and the details and triggers a secondary request if necessary to ensure data integrity. Thus, content existence confirmation replaces blind timing retransmission, and the retransmission pressure is shifted from peak hours to more bearable periods through the budget time limit, resulting in a significant reduction in unreasonable occupation, a decrease in energy consumption at the terminal side, a convergence of the tail of the overall latency distribution, and the preservation of key state quantities due to the summary channel. The gateway and the center reduce the burden of storage and deduplication, and the overall service quality is more stable during peak hours.

[0048] According to some embodiments, further comprising: to suppress mirror reflection type interference caused by a specific rectifier or dimming device, performing a low-duty-cycle pointing perturbation measurement on the high-speed wireless radio frequency communication channel, calculating the echo stability score and path delay characteristics of each candidate pointing, and applying a penalty weight to the candidate pointing with abnormally high stability score and abnormally short path delay, so as to preferentially use the propagation path with higher diversity and non-mirror reflection dominance in relay pointing and beamforming selection, to improve the link robustness in complex indoor metal environments.

[0049] Exemplarily, in the indoor power distribution scene where metal structures are dense or specific rectification / light modulation devices are adopted, the radio frequency channel often appears a pseudo-stable strong path caused by approximate mirror reflection, and the conventional beam forming is easily attracted to the direction and causes a sudden disconnection when the environment is disturbed. Therefore, the system periodically performs a small amplitude pointing perturbation measurement on a plurality of candidate pointing directions without affecting the service, and statistically obtains the echo intensity stability and path delay distribution characteristics of each pointing direction. If some candidate pointing directions simultaneously present an abnormally high stability score and an abnormally short path delay, the edge scheduler determines that the direction is most likely dominated by mirror reflection, and accordingly applies a penalty weight to the direction in beam selection and relay pointing scoring, and improves the priority of candidate paths with rich multipath and more dispersed delay distribution. During formal bearing, the system continues to make a light re-verification in a low duty cycle manner, and if it is found that the score is reversed due to environmental changes, the pointing direction is adjusted immediately. Thus, based on the short-term strong but fragile propagation mechanism of the mirror reflection direction, the pseudo-stable path is actively avoided by joint determination of stability and delay, so that in the underground space or equipment room where lamps are dense and metal reflection is significant, the sudden disconnection event of the link can be significantly reduced, the long-term throughput is more stable, the high quantile delay of key reports is significantly reduced, and without additional complex hardware, only relying on software scoring and light detection can be implemented, and the engineering deployment cost is low.

[0050] The low-voltage power grid state information management method based on a dual mode in the embodiments of the application is described above, and the low-voltage power grid state information management system based on a dual mode in the embodiments of the application is described below.

[0051] Referring to Figure 2 An embodiment of the low-voltage power grid state information management system based on a dual mode described in the embodiments of the application can include: The acquisition unit 201 is configured to acquire control harmonic characteristic parameters of grid-connected inverter equipment in a district and physical layer state parameters of a high-speed power carrier communication channel in the district, and the control harmonic characteristic parameters include at least one of a switching frequency, a combined frequency, an amplitude, and a phase, and the physical layer state parameters include an automatic gain control operating point, a noise baseline, and a subcarrier bit error rate. The identification unit 202 is configured to construct a bit error rate risk assessment model based on the control harmonic characteristic parameters and the physical layer state parameters on the concentrator side or the edge node side, to identify a link risk state that needs to perform feedforward gain limitation and spectrum migration. The management unit 203 is configured to, in a case where it is determined based on the link risk state that there is control harmonic causing selective desensitization of the high-speed power carrier communication front end, impose a feed-forward gain limitation constraint on an operating range of automatic gain control of the high-speed power carrier communication channel, migrate high-risk subcarriers to a low-risk frequency band, and establish a bypass relay path through the high-speed wireless radio frequency communication channel to transmit critical data during the spectrum migration and feed-forward gain limitation.

[0052] The above Figure 2 The dual-mode based low-voltage power grid state information management system in the embodiments of the present application is described from the perspective of a modular functional entity, and the dual-mode based low-voltage power grid state information management system in the embodiments of the present application is described in detail from the perspective of hardware processing. Please refer to Figure 3 The dual-mode based low-voltage power grid state information management system 300 in the embodiments of the present application includes: The input device 301, the output device 302, the processor 303, and the memory 304, wherein the number of the processor 303 can be one or more, Figure 3 For example, one processor 303 is taken in the embodiments of the present application. In some embodiments of the present application, the input device 301, the output device 302, the processor 303, and the memory 304 can be connected through a bus or other means, wherein, Figure 3 For example, the connection through the bus is taken.

[0053] The processor 303 is configured to execute the above steps by calling the operation instructions stored in the memory 304.

[0054] The processor 303 is further configured to execute Figure 1 any of the manners in the corresponding embodiments.

[0055] Please refer to Figure 4 , Figure 4 The embodiment of the electronic device provided in the embodiments of the present application is shown in the embodiment schematic diagram of the electronic device.

[0056] As Figure 4 shown, the electronic device provided in the embodiments of the present application includes the memory 304, the processor 303, and the computer program 411 stored in the memory 304 and executable on the processor 303, and the processor 303 implements the above steps when executing the computer program 411.

[0057] In the specific implementation process, the processor 303 can implement Figure 1 any of the manners in the corresponding embodiments.

[0058] Since the electronic device introduced in the embodiment is the device used in implementing the low-voltage power grid state information management system based on the dual mode in the embodiment of the application, based on the method introduced in the embodiment of the application, the person skilled in the art can understand the specific implementation of the electronic device in the embodiment and various changes thereof, and therefore, how the electronic device implements the method in the embodiment of the application is not described in detail herein, as long as the device used by the person skilled in the art to implement the method in the embodiment of the application belongs to the scope of the application.

[0059] Please refer to Figure 5 , Figure 5 An embodiment of a computer readable storage medium provided in the embodiment of the application is shown.

[0060] As Figure 5 shown, the embodiment provides a computer readable storage medium 500, which stores a computer program 511, and the computer program 511 is executed by a processor to implement the above steps.

[0061] By calling the operation instructions stored in the memory 304, the processor 303 is also used to execute Figure 1 any mode in the corresponding embodiment.

[0062] The embodiment of the application provides a computer program product, which comprises one or more computer instructions, and when the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiment of the application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center through a wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that the computer can store or be integrated into a server, data center and other data storage devices containing one or more available media sets. The available medium can be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)) and the like.

[0063] The above-described embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-voltage power grid status information management method based on dual-mode, characterized in that, include: The control harmonic characteristic parameters of grid-connected inverter equipment in the distribution area and the physical layer status parameters of the high-speed power line carrier communication channel are collected. The control harmonic characteristic parameters include at least one of switching frequency, combination frequency, amplitude and phase. The physical layer status parameters include automatic gain control operating point, noise baseline and subcarrier bit error rate. On the concentrator side or edge node side, a bit error rate risk assessment model is constructed based on the control harmonic characteristic parameters and the physical layer state parameters to identify link risk states that require feedforward gain limiting and spectrum migration. If, based on the link risk status, it is determined that the presence of control harmonics causes selective desensitization of the high-speed power line carrier communication front end, the working range of automatic gain control is applied to the high-speed power line carrier communication channel to migrate high-risk subcarriers to low-risk frequency bands, and a bypass relay path is established through the high-speed wireless radio frequency communication channel to transmit critical data during the spectrum migration and feedforward gain limitation period.

2. The method according to claim 1, characterized in that, The step involves constructing a bit error rate risk assessment model on the concentrator side or edge node side based on the control harmonic characteristic parameters and the physical layer state parameters to identify link risk states that require feedforward gain limiting and spectrum migration, including: On the concentrator side or edge node side, a bit error rate risk assessment model is constructed based on the control harmonic characteristic parameters and the physical layer state parameters; Based on the bit error rate risk assessment model, a crisis time window is generated for the high-speed power line carrier communication channel to identify the set of high-risk subcarriers; By combining the crisis time window with the set of high-risk subcarriers, link risk states that require feedforward gain limiting and spectrum migration are identified.

3. The method according to claim 1, characterized in that, The step of constructing a bit error rate risk assessment model based on the control harmonic characteristic parameters and the physical layer state parameters includes: The control harmonic characteristic parameters are subjected to time series smoothing. Based on the physical layer state parameters and the processed control harmonic characteristic parameters, an empirical surface model is obtained by fitting through spline regression or Gaussian process regression, and the empirical surface model is used as the risk assessment model.

4. The method according to claim 2, characterized in that, The step of generating a crisis time window for the high-speed power line carrier communication channel based on the bit error rate risk assessment model to identify the set of high-risk subcarriers includes: The crisis time window for the high-speed power line carrier communication channel is generated based on the bit error rate risk assessment model. The slope of the group delay with respect to frequency and the rate of change of the impedance spectrum for each subcarrier are obtained based on physical layer measurements. The combined threshold of the slope of the group delay with respect to frequency and the rate of change of the impedance spectrum is used as the basis for subcarrier risk screening, and the high-risk subcarrier set is preferentially identified within the crisis time window.

5. The method according to claim 2, characterized in that, The high-speed wireless radio frequency communication channel is configured as the priority transmission channel for event-type messages within the crisis time window, and the high-speed power line carrier communication channel is configured as the transmission channel for periodic and differential components within the crisis time window.

6. The method according to claim 1, characterized in that, The establishment of a bypass relay path via a high-speed wireless radio frequency communication channel to transmit critical data during spectrum migration and feedforward gain limitations includes: Trigger a low duty cycle probe pulse within the zero-crossing phase window of the power grid to measure multipath stability; Based on the measured stability, a bypass relay path is established by selecting the relay pointer and packet transmission time slot to transmit critical data during spectrum migration and feedforward gain limitation.

7. The method according to claim 1, characterized in that, Also includes: When it is determined that there are control harmonics causing selective desensitization of the high-speed power line carrier communication front end based on the link risk status, the transmission parameters are dynamically adjusted under the condition of satisfying electromagnetic compatibility constraints, which include at least the field strength limit threshold and the sideband leakage threshold. When sideband leakage is detected to exceed the constraints, automatic transmission parameter backoff control is executed to reduce the electromagnetic radiation level and restore it to the compliant range. The transmission parameter backoff control includes at least one of reducing the transmission power density, reducing the number of subcarriers participating in the transmission, reducing the transmission duty cycle, and reducing the concurrent packet transmission rate. While the launch parameter yield control is being executed, event logs are generated and stored.

8. A low-voltage power grid status information management system based on dual-mode, characterized in that, include: The acquisition unit is used to acquire control harmonic characteristic parameters of grid-connected inverter equipment in the distribution area and physical layer status parameters of the high-speed power line carrier communication channel. The control harmonic characteristic parameters include at least one of switching frequency, combination frequency, amplitude and phase. The physical layer status parameters include automatic gain control operating point, noise baseline and subcarrier bit error rate. The identification unit is used to construct a bit error rate risk assessment model based on the control harmonic characteristic parameters and the physical layer state parameters on the concentrator side or the edge node side, so as to identify the link risk status that requires the implementation of feedforward gain limiting and spectrum migration. The management unit is used to apply a feedforward gain limiting constraint automatic gain control operating range to the high-speed power line carrier communication channel when the presence of control harmonics causes selective desensitization of the high-speed power line carrier communication front end based on the link risk status. This allows the high-risk subcarriers to be migrated to low-risk frequency bands, and a bypass relay path is established through the high-speed wireless radio frequency communication channel to transmit critical data during the spectrum migration and feedforward gain limiting period.

9. An electronic device, characterized in that, The electronic device includes at least one processor and at least one memory connected to the processor, wherein the processor is used to call program instructions in the memory to execute the dual-mode low-voltage power grid status information management method as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, The storage medium includes a stored program, wherein, when the program is executed, it controls the device where the storage medium is located to perform the dual-mode low-voltage power grid status information management method as described in any one of claims 1 to 7.

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