An on-pole circuit breaker automatic protection and control system, method and device

Abstract

The present invention relates to the technical field of circuit breaker control, and specifically discloses an on-pole circuit breaker automatic protection and control system, method and device. The system includes a grid connection request receiving module, a circuit breaker protection parameter setting module, a parameter correction module and a protection control module. By judging whether the distributed power source is newly connected to the grid, the protection parameters are dynamically set and corrected in combination with its scale information and environmental data, and the action delay is optimized based on the communication distance and status data. The present invention covers steps such as grid connection request reception, parameter initialization and correction, and anomaly detection. By using Internet of Things technology to collect multi-dimensional data in real time, quantitatively evaluate the influence degree of inrush current and environmental fluctuations, and dynamically match the protection parameter thresholds and delays, effectively solving the problem of false alarms of circuit breakers caused by inrush current during the access of distributed power sources, and improving the stability of power grid operation and the accuracy of protection actions.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breaker control, and in particular to an automatic protection and control system, method and device for a pole-mounted circuit breaker. Background Art

[0002] With the large-scale grid connection of distributed power sources, the closing inrush current generated during the grid connection process has put forward higher requirements for the existing circuit breaker protection system. As an instantaneous high-amplitude current, the closing inrush current can easily cause the circuit breaker protection system to malfunction, resulting in unplanned power outages or equipment damage. Traditional circuit breaker protection systems mostly use fixed threshold parameters, which are difficult to adapt to the dynamic characteristics of distributed power sources.

[0003] For example, the invention patent with publication number CN117095965A is an intelligent power switch suitable for primary and secondary fusion pole-mounted circuit breakers, which includes a power input module, a power supply detection module, a power processing module, a first load power detection module, a first power output module, a second load power detection module, and a second power output module. This invention realizes the power output of the signal processing device and the coupling device by continuously detecting and processing the power of the signal processing device and the coupling device, and realizes the power detection and control of the power line communication system automatically to protect the terminal power module from overpowering.

[0004] For example, the invention patent with announcement number CN104752106B is a batch type circuit breaker overload protection fully automatic adjustment system, including: a manipulator, an automatic adjustment mechanism, and a conductive unit; the conductive units are located on both sides of the circuit breaker, the manipulator is located on the upper part of the conveyor belt, and the automatic adjustment mechanism is located on one side of the circuit breaker; the conductive unit is fixed to the workbench, and the conductive unit is located on both sides of the conveyor belt. The batch type circuit breaker overload protection fully automatic adjustment system of the present invention can automatically and at one time complete the adjustment of the overload protection characteristics of multiple small circuit breakers, the manipulator realizes batch grabbing, the modular conductive unit contacts the terminal in the front and rear wiring chambers at the same time, and the automatic adjustment mechanism can carry out adjustment operations on multiple circuit breakers at the same time, completing the large-scale, high-efficiency, and high-quality adjustment of the circuit breaker overload protection characteristic adjustment technology at one time.

[0005] However, in the process of implementing the technical solution of the invention in the embodiments of the present application, it is found that the above technology has at least the following technical problems: when the distributed power source is connected to the transmission line, a closing surge current will be generated. The closing surge current is a transient impact current that is much larger than the normal working current. Therefore, when the distributed power source is connected to the transmission line, it may cause the pole-mounted circuit breaker to falsely alarm. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides an on - column circuit breaker automatic protection and control system, method and device, which can effectively solve the problems involved in the above - mentioned background technology.

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: In the first aspect of the present invention, an on - column circuit breaker automatic protection and control system is provided, including: A grid - connection request receiving module, which is used to obtain the distribution line to which the distributed power source to be connected is located, extract the position information of the on - column circuit breaker on this distribution line, and the on - column circuit breaker receives the grid - connection request of the distributed power source.

[0008] A circuit breaker protection parameter setting module, which is used to judge whether the distributed power source is grid - connected for the first time, obtain the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is grid - connected for the first time, the on - column circuit breaker protection parameters are initially set according to the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is not grid - connected for the first time, the on - column circuit breaker protection parameters set in the previous time are obtained, and the on - column circuit breaker protection parameters are corrected according to the distributed power source environment data.

[0009] A circuit breaker protection parameter correction module, which is used to collect the distance between the grid - connection point and the on - column circuit breaker, obtain the communication status data, correct the set on - column circuit breaker protection parameters, and record the final on - column circuit breaker protection parameters.

[0010] A circuit breaker protection control module, which is used to detect the power data of the distribution line after the distributed power source is connected, and judge whether there is an abnormality according to the preset distributed power source inrush current data fluctuation range and the final on - column circuit breaker protection parameters.

[0011] Further, the process of initially setting the on - column circuit breaker protection parameters according to the scale information of the distributed power source and the distributed power source environment data is as follows: The scale information of the distributed power source includes the power storage of the distributed power source, the power generation of each clean energy source of the distributed power source, and the device density of the distributed power source; The distributed power source environment data includes the wind speed, water body flow rate, and light flux in the power generation area of the distributed power source.

[0012] The distributed power source inrush current influence degree index is obtained by processing the scale information of the distributed power source and the distributed power source environment data, and the on - column circuit breaker protection parameters initially set for the on - column circuit breaker of the distribution line are obtained by matching the distributed power source inrush current influence degree index with the on - column circuit breaker protection parameters corresponding to each distributed power source inrush current influence degree index interval in the circuit breaker database.

[0013] The distributed power inrush impact degree index is used to quantitatively evaluate the impact degree of the access of distributed power on the stability of the distribution line. The pole-mounted circuit breaker protection parameters include the electrical data protection threshold of the pole-mounted circuit breaker and the preset time delay of the pole-mounted circuit breaker protection action.

[0014] Further, the distributed power inrush impact degree index obtained by processing the scale information of the distributed power and the distributed power environment data has the following specific process: According to the proportional relationship between the electrical storage capacity of the distributed power and the preset electrical storage capacity reference value, combined with the first inrush impact weight coefficient for calibration, it is marked as the electrical storage impact component; based on the comparison relationship between the distributed power equipment density and the preset reference equipment density, combined with the second inrush impact weight coefficient for spatial impact quantification, it is marked as the spatial impact component.

[0015] Obtain the distributed power environment data at the current time point, respectively obtain the proportion of the power generation of each clean energy in the total power generation, combine the ratio of the corresponding environmental parameter to the environmental parameter reference value, generate the relative impact factor of each clean energy, superimpose the relative impact factors of each clean energy, and combine the third inrush impact weight coefficient for environmental impact quantification, which is marked as the clean energy comprehensive dynamic impact component.

[0016] Dynamically balance and superimpose the electrical storage impact component, the spatial impact component and the clean energy comprehensive dynamic impact component to generate the distributed power inrush impact degree index.

[0017] Further, obtain the pole-mounted circuit breaker protection parameters set in the adjacent primary, and correct the pole-mounted circuit breaker protection parameters according to the distributed power environment data. The specific process is as follows: Obtain the distributed power environment data at each monitoring time point within the preset monitoring time period, based on the difference between the maximum value and the minimum value of the wind speed, water body flow rate and light flux within the monitoring time period, combined with the corresponding environmental parameter reference value, calculate the fluctuation amplitude of each environmental parameter respectively, and perform weighted superposition through the preset environmental weight coefficient to generate the environmental data difference component.

[0018] Calculate the deviation of the wind speed, water body flow rate and light flux at each monitoring time point from the corresponding average value within the monitoring time period, and perform normalization processing in combination with the preset environmental parameter reference difference to generate the environmental dynamic fluctuation component at each monitoring time point.

[0019] Superimpose the environmental dynamic fluctuation amounts at each monitoring time point according to the weight, and jointly generate the protection parameter environmental adaptation parameter with the environmental data difference component. Correct the pole-mounted circuit breaker protection parameters according to the protection parameter environmental adaptation parameter.

[0020] Further, the protection parameters of the pole-mounted circuit breaker are corrected according to the protection parameter environmental adaptation parameter. The specific process is as follows: Obtain the protection parameter environmental adaptation parameter threshold from the circuit breaker database, compare the protection parameter environmental adaptation parameter with the protection parameter environmental adaptation parameter threshold. If the protection parameter environmental adaptation parameter is greater than or equal to the protection parameter environmental adaptation parameter threshold, reset the protection parameters of the pole-mounted circuit breaker according to the initial grid connection process.

[0021] If the protection parameter environmental adaptation parameter is less than the protection parameter environmental adaptation parameter threshold, match the protection parameter environmental adaptation parameter with the correction value of the electrical data protection threshold of the pole-mounted circuit breaker corresponding to each protection parameter environmental adaptation parameter interval in the circuit breaker database, and superimpose the electrical data protection threshold of the pole-mounted circuit breaker set in the previous time with the correction value of the electrical data protection threshold of the pole-mounted circuit breaker respectively to obtain the corrected electrical data protection threshold of the pole-mounted circuit breaker.

[0022] Further, the correction of the protection parameters of the pole-mounted circuit breaker that have been set is as follows: Mark the distance between the grid connection point and the pole-mounted circuit breaker as the grid connection inrush current transfer distance; the communication status data includes the packet loss rate and the bit error rate; jointly process the grid connection inrush current transfer distance and the communication status data to obtain the action delay correction parameter, which is used to quantify the influence degree of the distance and communication quality on the action delay, and provide a basis for adjusting the preset delay of the protection action of the pole-mounted circuit breaker.

[0023] Match the action delay correction parameter with the action delay correction value corresponding to each action delay correction parameter interval in the circuit breaker database, and superimpose the action delay correction value with the preset action delay of the protection action of the pole-mounted circuit breaker that has been set to obtain the corrected preset action delay of the protection action of the pole-mounted circuit breaker; jointly mark the corrected electrical data protection threshold of the pole-mounted circuit breaker and the corrected preset action delay of the protection action of the pole-mounted circuit breaker as the final protection parameters of the pole-mounted circuit breaker.

[0024] Further, the process of jointly processing the grid connection inrush current transfer distance and the communication status data to obtain the action delay correction parameter is as follows: Based on the proportional relationship between the grid connection inrush current transfer distance and the preset inrush current transfer distance reference value, dynamically adjust the correction intensity of the distance factor on the action delay through the predefined distance delay weight coefficient, and mark it as the distance correction component.

[0025] Standardize and compare the packet loss rate and the bit error rate with the preset packet loss rate reference value and the bit error rate reference value respectively, and perform weighted fusion on the comprehensive deviation of the two through the predefined communication delay weight coefficient, and mark it as the communication quality correction component; superimpose and integrate the distance correction component and the communication quality correction component to generate the action delay correction parameter.

[0026] Further, determining whether an abnormality occurs according to the preset distributed power inrush data fluctuation range and the final pole-mounted circuit breaker protection parameters, the specific process is as follows: The power data of the distribution line includes the line voltage, line current, and line power transmission frequency at each screening time point; the distributed power inrush data fluctuation range includes the line voltage fluctuation range, line current fluctuation range, and line power transmission frequency fluctuation range at each screening time point.

[0027] Compare the power data of the distribution line with the corrected protection threshold of the electrical data of the pole-mounted circuit breaker. If there is power data exceeding the corrected protection threshold of the electrical data of the pole-mounted circuit breaker, it is determined that an inrush abnormality has occurred, and the circuit breaker triggers a preset protection strategy to perform a power-off operation according to the preset time delay of the corrected pole-mounted circuit breaker protection action.

[0028] If there is no power data exceeding the corrected protection threshold of the electrical data of the pole-mounted circuit breaker, continue to monitor the power data of the distribution line, and compare the power data of the distribution line with the distributed power inrush data fluctuation range in real time, obtain the screening time points where the power data is outside the distributed power inrush data fluctuation range, mark them as abnormal time points, and count the number of abnormal time points.

[0029] Compare the number of abnormal time points with the preset number threshold of abnormal time points in the circuit breaker database. If the number of abnormal time points is greater than or equal to the number threshold of abnormal time points, it is determined that an inrush abnormality has occurred, and the circuit breaker triggers a preset protection strategy to perform a power-off operation according to the preset time delay of the corrected pole-mounted circuit breaker protection action. If the number of abnormal time points is less than the number threshold of abnormal time points, no additional operation is performed.

[0030] The second aspect of the present invention provides a method for an automatic protection and control system of a pole-mounted circuit breaker, including: S1. Obtain a distribution line to which a distributed power source is to be connected, and extract the position information of the pole-mounted circuit breaker on the distribution line. The pole-mounted circuit breaker receives a distributed power grid connection request.

[0031] S2. Determine whether the distributed power source is connected to the grid for the first time, and obtain the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is connected to the grid for the first time, preliminarily set the pole-mounted circuit breaker protection parameters according to the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is not connected to the grid for the first time, obtain the previously set pole-mounted circuit breaker protection parameters and correct the pole-mounted circuit breaker protection parameters according to the distributed power source environment data.

[0032] S3. Collect the distance between the grid connection point and the pole-mounted circuit breaker, and obtain the communication status data, correct the set pole-mounted circuit breaker protection parameters, and record the final pole-mounted circuit breaker protection parameters.

[0033] S4. After connecting the distributed power source, detect the power data of the distribution line, and determine whether there is an abnormality according to the preset fluctuation range of the inrush current data of the distributed power source and the final protection parameters of the pole-mounted circuit breaker.

[0034] The third aspect of the present invention provides a pole-mounted circuit breaker automatic protection and control device, including: a processor, a memory and a network interface connected to the processor; the network interface is connected to a non-volatile memory in the server; when running, the processor retrieves a computer program from the non-volatile memory through the network interface, and runs the computer program through the memory to execute a pole-mounted circuit breaker automatic protection and control system.

[0035] Compared with the prior art, the embodiments of the present invention at least have the following advantages or beneficial effects:

[0036] (1) By providing a pole-mounted circuit breaker automatic protection and control system, method and device, the present invention dynamically corrects the protection parameters by combining the inrush current influence degree index and the environmental adaptation parameter, realizes the accurate matching of the threshold and the time delay, avoids the false alarm problem caused by the traditional static threshold, and improves the response speed and protection reliability of the circuit breaker in a complex power grid environment.

[0037] (2) By quantifying the influence of the electricity storage capacity, equipment density and environmental parameters on the inrush current, generating a dynamic index and matching it with the database, the present invention solves the problem of threshold setting deviation caused by the diversity of distributed power source types, makes the initialization of the protection parameters more suitable for the actual working conditions, and reduces the commissioning cost and risk of the first grid connection.

[0038] (3) By analyzing the range and dispersion of the environmental data fluctuation, and generating a correction parameter in combination with the historical reference value, the present invention realizes the adaptive optimization of the parameters during non-first grid connection, helps to quickly respond to short-term environmental changes, reduces the impact of extreme weather on the protection action, and improves the stability of the power grid in a dynamic environment. Brief Description of the Drawings

[0039] The present invention is further described with the accompanying drawings, but the embodiments in the drawings do not constitute any limitation to the present invention. For those of ordinary skill in the art, other drawings can be obtained according to the following drawings without creative work.

[0040] Figure 1 It is a schematic diagram of the system module connection of the present invention.

[0041] Figure 2 It is a schematic diagram of the method flow of the present invention. Detailed Embodiments

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0043] Referring to Figure 1 As shown, a kind of on-pole circuit breaker automatic protection and control system is provided in the first aspect of the present invention, including: a grid connection request receiving module, which is used to obtain the distribution line to which the distributed power source to be connected is to be connected, and extract the position information of the on-pole circuit breaker on the distribution line, and the on-pole circuit breaker receives the grid connection request of the distributed power source.

[0044] It should be understood that in this embodiment, the distributed power source refers to a new energy power station, such as a wind power station, a solar power station, etc. Before the new energy power station is connected to the distribution line, it sends a grid connection request to the on-pole circuit breaker of the distribution line. The system automatically adjusts the parameters of the on-pole circuit breaker through data analysis, optimizes the grid connection strategy, ensures the safe and reliable operation of the power grid, and improves the overall power supply efficiency.

[0045] A circuit breaker protection parameter setting module, which is used to judge whether the distributed power source is grid-connected for the first time, and obtain the scale information of the distributed power source and the environmental data of the distributed power source. If the distributed power source is grid-connected for the first time, the protection parameters of the on-pole circuit breaker are initially set according to the scale information of the distributed power source and the environmental data of the distributed power source. If the distributed power source is not grid-connected for the first time, the protection parameters of the on-pole circuit breaker set in the previous time are obtained, and the protection parameters of the on-pole circuit breaker are corrected according to the environmental data of the distributed power source.

[0046] A circuit breaker protection parameter correction module, which is used to collect the distance between the grid connection point and the on-pole circuit breaker, and obtain the communication status data, correct the set protection parameters of the on-pole circuit breaker, and record the final protection parameters of the on-pole circuit breaker.

[0047] It should be understood that in this embodiment, the grid connection point refers to the position point where the distributed power source is connected to the distribution line.

[0048] A circuit breaker protection control module, which is used to detect the power data of the distribution line after the distributed power source is connected, and judge whether there is an abnormality according to the preset fluctuation range of the inrush current data of the distributed power source and the final protection parameters of the on-pole circuit breaker.

[0049] Specifically, the protection parameters of the on-pole circuit breaker are initially set according to the scale information of the distributed power source and the environmental data of the distributed power source. The specific process is as follows: the scale information of the distributed power source includes the electricity storage of the distributed power source, the power generation of each clean energy of the distributed power source, and the equipment density of the distributed power source.

[0050] It should be understood that clean energy includes wind energy, water energy and solar energy. The power generation of each clean energy source of the distributed power source refers to the power generation of each clean energy source within the preset monitoring time period before grid connection. The electricity storage of the distributed power source refers to the electricity storage when preparing for grid connection. The equipment density of the distributed power source is the ratio of the number of new energy station equipment to the land area of the new energy station. The data in this embodiment can be obtained in real time from the monitoring system of the new energy station.

[0051] The distributed power source environmental data includes the wind speed, water body flow rate and light flux in the power generation area of the distributed power source.

[0052] It should be understood that the wind speed can be collected by an anemometer, the water body flow rate can be measured by a flowmeter, and the light flux can be monitored by a light flux meter.

[0053] The influence degree index of the distributed power source inrush current is processed based on the scale information of the distributed power source and the distributed power source environmental data, and the influence degree index of the distributed power source inrush current is matched with the pole-mounted circuit breaker protection parameters corresponding to each distributed power source inrush current influence degree index interval in the circuit breaker database to obtain the pole-mounted circuit breaker protection parameters initially set for the distribution line pole-mounted circuit breaker.

[0054] The influence degree index of the distributed power source inrush current is used to quantitatively evaluate the influence degree of the access of the distributed power source on the stability of the distribution line. The pole-mounted circuit breaker protection parameters include the electrical data protection threshold of the pole-mounted circuit breaker and the preset time delay of the pole-mounted circuit breaker protection action.

[0055] It should be understood that in this embodiment, the electrical data protection threshold of the pole-mounted circuit breaker includes the current peak threshold, voltage fluctuation value threshold and frequency deviation value threshold. Among them, the current peak refers to the maximum current value reached instantaneously in the distribution line, the voltage fluctuation value refers to the amplitude of the instantaneous voltage change, and the frequency deviation value refers to the difference between the actual frequency and the standard frequency.

[0056] Specifically, the influence degree index of the distributed power source inrush current is processed based on the scale information of the distributed power source and the distributed power source environmental data. The specific process is as follows: According to the proportional relationship between the electricity storage of the distributed power source and the preset electricity storage reference value, it is calibrated in combination with the first inrush current influence weight coefficient and marked as the electricity storage influence component; based on the comparison relationship between the equipment density of the distributed power source and the preset reference equipment density, the spatial influence is quantified in combination with the second inrush current influence weight coefficient and marked as the spatial influence component.

[0057] Obtain the distributed power environment data at the current time point, respectively obtain the proportion of the power generation of each clean energy in the total power generation, combine the ratio of the corresponding environmental parameters to the reference values of the environmental parameters, generate the relative impact factors of each clean energy, superimpose the relative impact factors of each clean energy, and combine the third inrush current impact weight coefficient to quantify the environmental impact, which is marked as the comprehensive dynamic impact component of clean energy; dynamically balance and superimpose the energy storage impact component, the space impact component and the comprehensive dynamic impact component of clean energy to generate the inrush current impact degree index of distributed power.

[0058] It should be understood that in this embodiment, each clean energy corresponds to an environmental parameter one by one, such as wind energy and wind speed, water energy and water body flow rate, solar energy and light flux. The reference values of environmental parameters include the reference value of wind speed, the reference value of water body flow rate and the reference value of light flux. In this embodiment, the reference value of energy storage, the reference equipment density, the reference value of environmental parameters, and the first inrush current impact weight coefficient, the second inrush current impact weight coefficient, and the third inrush current impact weight coefficient are all preset by the system and can be directly extracted from the circuit breaker database.

[0059] Among them, the first inrush current impact weight coefficient, the second inrush current impact weight coefficient, and the third inrush current impact weight coefficient respectively correspond to different weights of energy storage impact, space impact and environmental impact, and can be adjusted according to actual situations. For example, form a mapping set between the energy storage, equipment density or environmental data and the preset first inrush current impact weight coefficient, second inrush current impact weight coefficient or third inrush current impact weight coefficient in the clinical trial database, and obtain the first inrush current impact weight coefficient, second inrush current impact weight coefficient or third inrush current impact weight coefficient according to the input of the energy storage, equipment density or environmental data into the mapping set. The mapping relationship is a one-to-one relationship. In this embodiment, the value range of the weight factor is between 0 and 1.

[0060] In a specific embodiment, the method for obtaining the inrush current impact degree index of distributed power is as follows:

[0061] ;

[0062] ;

[0063] In the formula, represents the inrush current impact degree index of distributed power, is the preset first inrush current impact weight coefficient, is the preset second inrush current impact weight coefficient, is the preset third inrush current impact weight coefficient, CN is the energy storage of distributed power, is the preset reference value of energy storage, S is the equipment density of distributed power, is the preset reference equipment density, FV represents wind speed, SV represents water body flow rate, GL represents light flux, represents the preset wind speed reference value, represents the preset water body flow rate reference value, represents the preset luminous flux reference value, k represents the number of each clean energy source, k = 1, 2, 3, represents the power generation of the k-th clean energy source, where, represents the wind power generation, represents the water power generation, represents the solar power generation.

[0064] In this embodiment, the influence degree index of the distributed power source inrush current is calculated comprehensively from the distributed power source electricity storage, the distributed power source device density, and the power generation of each clean energy source. Among them, the lower the distributed power source electricity storage, or the greater the distributed power source device density and the power generation of each clean energy source, the higher the influence degree index of the distributed power source inrush current. The parameters in the formula influence each other. The environmental parameters indirectly act on the charge and discharge state of the electricity storage by affecting the power generation. The electricity storage can reversely restrict the impact intensity of the environmental fluctuations on the line. As an energy buffer unit, the electricity storage directly affects the absorption ability of the power generation fluctuations. At the same time, the distributed power source device density directly affects the power generation of each clean energy source. The greater the distributed power source device density, the more likely it is to increase the parasitic capacitance of the line and amplify the transient oscillation during the inrush current occurrence.

[0065] In this embodiment, by quantitatively evaluating the influence degree of the distributed power source access on the stability of the distribution line, and real-time matching the quantitative data with the preset pole-mounted circuit breaker protection parameters, dynamically setting the electrical protection threshold and the action delay, it can be optimized in real time according to the comprehensive influence of the environment, energy storage, and power generation, reducing the probability of misoperation and refusal to operate.

[0066] Specifically, obtain the pole-mounted circuit breaker protection parameters set adjacent to the primary, and correct the pole-mounted circuit breaker protection parameters according to the distributed power source environment data. The specific process is as follows: obtain the distributed power source environment data at each monitoring time point within the preset monitoring time period, and based on the difference between the maximum and minimum values of the wind speed, water body flow rate, and luminous flux within the monitoring time period, combined with the corresponding environmental parameter reference values, calculate the fluctuation amplitude of each environmental parameter respectively, and generate the environmental data difference component through weighted superposition with the preset environmental weight coefficient.

[0067] Calculate the deviation of the wind speed, water body flow rate, and luminous flux at each monitoring time point from the corresponding average value within the monitoring time period, and perform normalization processing in combination with the preset environmental parameter reference difference to generate the environmental dynamic fluctuation component at each monitoring time point; superimpose the environmental dynamic fluctuation amounts at each monitoring time point according to the weight, and jointly generate the protection parameter environmental adaptation parameter with the environmental data difference component.

[0068] It should be understood that in this embodiment, the environmental weight coefficients respectively include the environmental wind speed weight coefficient, the environmental water body flow rate weight coefficient, and the environmental light flux weight coefficient. Among them, the wind speed reference difference, the water body flow rate reference difference, and the light flux reference difference are statistically obtained from the historical environmental data in the circuit breaker database and are used to characterize the normal fluctuation range of different environmental parameters. The values of the environmental wind speed weight coefficient, the environmental water body flow rate weight coefficient, and the environmental light flux weight coefficient are dynamically determined by the distributed power generation type. For example, a mapping set is established based on the proportion of the environmental weight coefficient and the corresponding power generation of the environmental parameters of the new energy power station in the historical data. By inputting the proportion of the power generation corresponding to each environmental parameter, the environmental weight coefficient corresponding to each environmental parameter is obtained.

[0069] In this embodiment, the environmental adaptation parameter of the protection parameter is comprehensively calculated from the environmental data difference component and the environmental dynamic fluctuation component. The environmental data difference component is used to reflect the maximum fluctuation amplitude of the wind speed, water body flow rate, and light flux within the monitoring time period. The environmental dynamic fluctuation component is normalized by the deviation of the environmental parameter from the average value at each monitoring time point to quantify the deviation degree of the real-time environmental fluctuation from the historical average state. When the wind speed range, water body flow rate range, and light flux range are larger, or the environmental data dispersion degree within the monitoring time period is larger, the environmental adaptation parameter of the protection parameter is also larger.

[0070] In a specific embodiment, the acquisition method of the environmental adaptation parameter of the protection parameter is as follows:

[0071] ;

[0072] ;

[0073] ;

[0074] In the formula, represents the environmental adaptation parameter of the protection parameter, represents the environmental data difference component, represents the preset environmental wind speed weight coefficient, represents the preset environmental water body flow rate weight coefficient, represents the preset environmental light flux weight coefficient, represents the wind speed at the i-th monitoring time point, represents the water body flow rate at the i-th monitoring time point, represents the light flux at the i-th monitoring time point, ∆FV represents the wind speed reference difference, ∆SV represents the water body flow rate reference difference, ∆GL represents the light flux reference difference, represents the maximum wind speed within the monitoring time period, represents the minimum wind speed within the monitoring time period, represents the maximum water body flow rate within the monitoring time period, represents the minimum water body flow velocity during the monitoring time period, represents the maximum light flux during the monitoring time period, represents the minimum light flux during the monitoring time period, i represents the number of each monitoring time point, i = 1, 2, 3,..., n, and n represents the total number of monitoring time points.

[0075] In this embodiment, by quantifying the range and dispersion of environmental fluctuations, the correction of static parameters is transformed into a dynamic balance process. Through the environmental weight coefficient for weight distribution, the correction strategies of different types of distributed power sources are differentiated, improving the accuracy of the correction of the protection parameters of the pole-mounted circuit breaker. The environmental adaptation parameters of the protection parameters and the influence degree index of the inrush current of the distributed power source form a collaborative correction system. By correcting the adaptation parameters during non-primary grid connection, the real-time compensation of short-term environmental fluctuations is analyzed, forming a closed-loop optimization mechanism.

[0076] The protection parameters of the pole-mounted circuit breaker are corrected according to the environmental adaptation parameters of the protection parameters.

[0077] Specifically, the process of correcting the protection parameters of the pole-mounted circuit breaker according to the environmental adaptation parameters of the protection parameters is as follows: Obtain the threshold value of the environmental adaptation parameters of the protection parameters from the circuit breaker database, compare the environmental adaptation parameters of the protection parameters with the threshold value of the environmental adaptation parameters of the protection parameters. If the environmental adaptation parameters of the protection parameters are greater than or equal to the threshold value of the environmental adaptation parameters of the protection parameters, the protection parameters of the pole-mounted circuit breaker are reset according to the primary grid connection process.

[0078] If the environmental adaptation parameters of the protection parameters are less than the threshold value of the environmental adaptation parameters of the protection parameters, the environmental adaptation parameters of the protection parameters are matched with the correction values of the electrical data protection thresholds of the pole-mounted circuit breaker corresponding to each environmental adaptation parameter interval in the circuit breaker database, and the electrical data protection thresholds of the pole-mounted circuit breaker set in the previous time are respectively superimposed with the correction values of the electrical data protection thresholds of the pole-mounted circuit breaker to obtain the corrected electrical data protection thresholds of the pole-mounted circuit breaker.

[0079] It should be understood that the preset delay of the protection action of the pole-mounted circuit breaker is adjusted in the circuit breaker protection parameter correction module, and the preset delay of the protection action of the pole-mounted circuit breaker will be synchronously updated with the corrected electrical data protection thresholds of the pole-mounted circuit breaker to ensure the timeliness and accuracy of the protection action under environmental fluctuations.

[0080] Specifically, the process of correcting the set protection parameters of the pole-mounted circuit breaker is as follows: Mark the distance between the grid connection point and the pole-mounted circuit breaker as the inrush current transfer distance of the grid connection.

[0081] It should be understood that in this embodiment, the distance between the grid connection point and the pole-mounted circuit breaker can be directly collected by the global positioning system.

[0082] The communication status data includes packet loss rate and bit error rate.

[0083] It should be understood that in this embodiment, the communication status data refers to the packet loss rate and bit error rate during data exchange between the grid connection point and the pole-mounted circuit breaker, and can be obtained by taking the average value of the communication status data of each historical communication.

[0084] The action delay correction parameter is obtained by jointly processing the grid connection inrush current transmission distance and the communication status data. The action delay correction parameter is used to quantify the influence degree of distance and communication quality on the action delay, and provides a basis for adjusting the preset delay of the pole-mounted circuit breaker protection action.

[0085] Match the action delay correction parameter with the action delay correction value corresponding to each action delay correction parameter interval in the circuit breaker database, and superimpose the action delay correction value on the preset action delay of the pole-mounted circuit breaker protection that has been set to obtain the corrected preset action delay of the pole-mounted circuit breaker protection.

[0086] Jointly mark the corrected electrical data protection threshold of the pole-mounted circuit breaker and the corrected preset action delay of the pole-mounted circuit breaker protection as the final pole-mounted circuit breaker protection parameter.

[0087] Specifically, the action delay correction parameter is obtained by jointly processing the grid connection inrush current transmission distance and the communication status data. The specific process is as follows: Based on the proportional relationship between the grid connection inrush current transmission distance and the preset inrush current transmission distance reference value, through the predefined distance delay weight coefficient, dynamically adjust the correction intensity of the distance factor on the action delay, and mark it as the distance correction component.

[0088] Compare the packet loss rate and the bit error rate with the preset packet loss rate reference value and the bit error rate reference value respectively, and perform weighted fusion on the comprehensive deviation of the two through the predefined communication delay weight coefficient, and mark it as the communication quality correction component.

[0089] Superimpose and integrate the distance correction component and the communication quality correction component to generate the action delay correction parameter.

[0090] It should be understood that in this embodiment, the inrush current transmission distance reference value, the packet loss rate reference value, and the bit error rate reference value are all preset by the system and can be directly called from the circuit breaker database. The distance delay correction weight coefficient and the communication delay correction weight coefficient are dynamically adjusted according to the actual working conditions. For example, considering the influence of wind speed on communication quality, in the circuit breaker database, a mapping set is formed between the wind speed and the distance delay correction weight coefficient and the communication delay correction weight coefficient. Input the real-time wind speed into the mapping set, and the corresponding distance delay correction weight coefficient and communication delay correction weight coefficient can be obtained.

[0091] In a specific embodiment, the acquisition method of the action delay correction parameter is as follows:

[0092] ;

[0093] ;

[0094] In the formula, represents the action time delay correction parameter, represents the preset distance time delay correction weight coefficient, represents the preset communication time delay correction weight coefficient, represents the grid-connected inrush current transfer distance, represents the preset inrush current transfer distance reference value, represents the packet loss rate, represents the preset packet loss rate reference value, and WM represents the bit error rate, represents the preset bit error rate reference value.

[0095] In this embodiment, the action time delay correction parameter is jointly determined by the grid-connected inrush current transfer distance, the packet loss rate, and the bit error rate. The larger the grid-connected inrush current transfer distance, the packet loss rate, and the bit error rate, the larger the corresponding action time delay correction parameter, and the longer the system response time. At the same time, the grid-connected inrush current transfer distance, the packet loss rate, and the bit error rate are interrelated. The larger the grid-connected inrush current transfer distance, the more interference factors in the communication process, the worse the communication quality, and the higher the packet loss rate and the bit error rate, further increasing the action time delay correction parameter.

[0096] In this embodiment, the action time delay of the pole-mounted circuit breaker is further refined and corrected according to the communication quality and the communication distance, ensuring the stable operation of the circuit breaker in a complex environment, while improving the response speed of the circuit breaker and enhancing the adaptability of the power grid in extreme weather.

[0097] Specifically, it is determined whether an abnormality occurs according to the preset distributed power source inrush current data fluctuation range and the final pole-mounted circuit breaker protection parameters. The specific process is as follows: The power data of the distribution line includes the line voltage, line current, and line power transmission frequency at each screening time point.

[0098] It should be understood that in this embodiment, the line voltage can be collected in real time through a voltage sensor, the line current is monitored by a current transformer, and the line power transmission frequency is measured by a frequency meter.

[0099] The distributed power source inrush current data fluctuation range includes the line voltage fluctuation range, the line current fluctuation range, and the line power transmission frequency fluctuation range at each screening time point.

[0100] It should be understood that in this embodiment, the distributed power source inrush current data fluctuation range is obtained by statistically analyzing historical distributed power source access inrush current events, and the maximum value of the corresponding power data is marked as the upper limit of the power data fluctuation range, and the minimum value is marked as the lower limit of the power data fluctuation range.

[0101] Compare the power data of the distribution line with the corrected protection threshold of the electrical data of the pole-mounted circuit breaker. If there is power data exceeding the corrected protection threshold of the electrical data of the pole-mounted circuit breaker, it is determined that a surge current anomaly has occurred, and the circuit breaker triggers a preset protection strategy to perform a power-off operation according to the preset time delay for the protection action of the corrected pole-mounted circuit breaker.

[0102] If there is no power data exceeding the corrected protection threshold of the electrical data of the pole-mounted circuit breaker, continue to monitor the power data of the distribution line, and compare the power data of the distribution line with the fluctuation range of the distributed power source surge current data in real time to obtain the screening time points where the power data is outside the fluctuation range of the distributed power source surge current data, mark them as abnormal time points, and count the number of abnormal time points.

[0103] Compare the number of abnormal time points with the preset threshold of the number of abnormal time points in the circuit breaker database. If the number of abnormal time points is greater than or equal to the threshold of the number of abnormal time points, it is determined that a surge current anomaly has occurred, and the circuit breaker triggers a preset protection strategy to perform a power-off operation according to the preset time delay for the protection action of the corrected pole-mounted circuit breaker. If the number of abnormal time points is less than the threshold of the number of abnormal time points, no additional operation is performed.

[0104] Refer to Figure 2 As shown, the second aspect of the present invention provides a method for automatic protection and control of a pole-mounted circuit breaker, including: S1. Obtain the distribution line to which the distributed power source is to be connected, extract the position information of the pole-mounted circuit breaker on the distribution line, and the pole-mounted circuit breaker receives the grid connection request of the distributed power source.

[0105] S2. Determine whether the distributed power source is connected to the grid for the first time, and obtain the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is connected to the grid for the first time, preliminarily set the protection parameters of the pole-mounted circuit breaker according to the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is not connected to the grid for the first time, obtain the protection parameters of the pole-mounted circuit breaker set in the previous time, and correct the protection parameters of the pole-mounted circuit breaker according to the distributed power source environment data.

[0106] S3. Collect the distance between the grid connection point and the pole-mounted circuit breaker, and obtain the communication status data, correct the set protection parameters of the pole-mounted circuit breaker, and record the final protection parameters of the pole-mounted circuit breaker.

[0107] S4. After connecting the distributed power source, detect the power data of the distribution line, and determine whether there is an abnormality according to the preset fluctuation range of the distributed power source surge current data and the final protection parameters of the pole-mounted circuit breaker.

[0108] The third aspect of the present invention provides an on-pole circuit breaker automatic protection and control device, including: a processor, a memory and a network interface connected to the processor; the network interface is connected to a non-volatile memory in the server; when running, the processor retrieves a computer program from the non-volatile memory through the network interface and runs the computer program through the memory to execute an on-pole circuit breaker automatic protection and control system.

[0109] The above content is only an example and illustration of the structure of the present invention. Those skilled in the art of the present technology can make various modifications or supplements to the described specific embodiments or use similar ways to replace them. As long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, they should fall within the protection scope of the present invention.

Claims

1. An on-pole circuit breaker automatic protection and control system, characterized in that, Including: A grid connection request receiving module, which is used to obtain the distribution line to which the distributed power source to be connected is located, extract the position information of the pole-mounted circuit breaker on the distribution line, and the pole-mounted circuit breaker receives the grid connection request of the distributed power source; A circuit breaker protection parameter setting module, which is used to judge whether the distributed power source is connected to the grid for the first time, obtain the scale information of the distributed power source and the environmental data of the distributed power source. If the distributed power source is connected to the grid for the first time, the protection parameters of the pole-mounted circuit breaker are initially set according to the scale information of the distributed power source and the environmental data of the distributed power source. If the distributed power source is not connected to the grid for the first time, the protection parameters of the pole-mounted circuit breaker set in the previous time are obtained, and the protection parameters of the pole-mounted circuit breaker are corrected according to the environmental data of the distributed power source; A circuit breaker protection parameter correction module, which is used to collect the distance between the grid connection point and the pole-mounted circuit breaker, obtain the communication status data, correct the set protection parameters of the pole-mounted circuit breaker, and record the final protection parameters of the pole-mounted circuit breaker; A circuit breaker protection control module, which is used to detect the power data of the distribution line after the distributed power source is connected, and judge whether there is an abnormality according to the preset fluctuation range of the inrush current data of the distributed power source and the final protection parameters of the pole-mounted circuit breaker; The process of initially setting the protection parameters of the pole-mounted circuit breaker according to the scale information of the distributed power source and the environmental data of the distributed power source is as follows: The scale information of the distributed power source includes the electricity storage capacity of the distributed power source, the power generation of each clean energy of the distributed power source, and the equipment density of the distributed power source; The environmental data of the distributed power source includes the wind speed, water body flow rate, and light flux in the power generation area of the distributed power source; The inrush current impact degree index of the distributed power source is obtained by processing the scale information of the distributed power source and the environmental data of the distributed power source. The inrush current impact degree index of the distributed power source is matched with the protection parameters of the pole-mounted circuit breaker corresponding to each inrush current impact degree index interval in the circuit breaker database to obtain the initially set protection parameters of the pole-mounted circuit breaker on the distribution line.

2. The automatic protection and control system for a pole-mounted circuit breaker according to claim 1, wherein: The initial setting of the protection parameters of the pole-mounted circuit breaker according to the scale information of the distributed power source and the environmental data of the distributed power source further includes: The inrush current impact degree index of the distributed power source is used to quantitatively evaluate the impact degree of the access of the distributed power source on the stability of the distribution line. The protection parameters of the pole-mounted circuit breaker include the electrical data protection threshold of the pole-mounted circuit breaker and the preset time delay of the protection action of the pole-mounted circuit breaker.

3. The automatic protection and control system for the pole-mounted circuit breaker according to claim 2, characterized in that: The process of obtaining the inrush current impact degree index of the distributed power source by processing the scale information of the distributed power source and the environmental data of the distributed power source is as follows: Calibration is carried out according to the proportional relationship between the electricity storage capacity of the distributed power source and the preset electricity storage capacity reference value, and combined with the first inrush current impact weight coefficient, and marked as the electricity storage impact component; Based on the comparison relationship between the equipment density of the distributed power source and the preset reference equipment density, the spatial impact is quantified by combining the second inrush current impact weight coefficient, and marked as the spatial impact component; Obtain the distributed power environment data at the current time point, respectively obtain the proportion of the power generation of each clean energy in the total power generation, combine the ratio of the corresponding environmental parameters to the reference values of the environmental parameters, generate the relative impact factors of each clean energy, superimpose the relative impact factors of each clean energy, and combine the third inrush current impact weight coefficient to quantify the environmental impact, which is marked as the comprehensive dynamic impact component of clean energy; Dynamically balance and superimpose the energy storage impact component, the space impact component and the comprehensive dynamic impact component of clean energy to generate the inrush current impact degree index of distributed power sources.

4. The automatic protection and control system for a pole-mounted circuit breaker according to claim 1, characterized in that: The above-mentioned obtaining the protection parameters of the pole-mounted circuit breaker set at the adjacent primary time, and correcting the protection parameters of the pole-mounted circuit breaker according to the distributed power environment data, the specific process is as follows: Obtain the distributed power environment data at each monitoring time point within the preset monitoring time period, based on the difference between the maximum value and the minimum value of the wind speed, water body flow rate and light flux within the monitoring time period, combine the corresponding reference values of the environmental parameters, calculate the fluctuation amplitude of each environmental parameter respectively, and perform weighted superposition through the preset environmental weight coefficient to generate the environmental data difference component; Calculate the deviation of the wind speed, water body flow rate and light flux at each monitoring time point from the corresponding average value within the monitoring time period, and perform normalization processing in combination with the preset reference difference of the environmental parameters to generate the environmental dynamic fluctuation component at each monitoring time point; Superimpose the environmental dynamic fluctuation amounts at each monitoring time point according to the weight, and jointly generate the environmental adaptation parameter of the protection parameter with the environmental data difference component; Correct the protection parameters of the pole-mounted circuit breaker according to the environmental adaptation parameter of the protection parameter.

5. The automatic protection and control system for a pole-mounted circuit breaker according to claim 4, characterized in that: The above-mentioned correcting the protection parameters of the pole-mounted circuit breaker according to the environmental adaptation parameter of the protection parameter, the specific process is as follows: Obtain the threshold of the environmental adaptation parameter of the protection parameter from the circuit breaker database, compare the environmental adaptation parameter of the protection parameter with the threshold of the environmental adaptation parameter of the protection parameter. If the environmental adaptation parameter of the protection parameter is greater than or equal to the threshold of the environmental adaptation parameter of the protection parameter, reset the protection parameters of the pole-mounted circuit breaker according to the initial grid connection process; If the environmental adaptation parameter of the protection parameter is less than the threshold of the environmental adaptation parameter of the protection parameter, match the environmental adaptation parameter of the protection parameter with the correction value of the electrical data protection threshold of the pole-mounted circuit breaker corresponding to each environmental adaptation parameter interval in the circuit breaker database, and superimpose the electrical data protection threshold of the pole-mounted circuit breaker set at the adjacent primary time with the correction value of the electrical data protection threshold respectively to obtain the corrected electrical data protection threshold of the pole-mounted circuit breaker.

6. The automatic protection and control system for an on-column circuit breaker according to claim 1, characterized in that: The above-mentioned correcting the protection parameters of the pole-mounted circuit breaker after the setting is completed, the specific process is as follows: Mark the distance between the grid connection point and the pole-mounted circuit breaker as the grid connection inrush current transmission distance; The above-mentioned communication status data includes packet loss rate and bit error rate; Process the grid connection inrush current transmission distance and the communication status data together to obtain the action delay correction parameter, which is used to quantify the influence degree of the distance and communication quality on the action delay, and provide a basis for presetting the adjustment of the action delay of the pole-mounted circuit breaker protection action; Match the action delay correction parameter with the action delay correction value corresponding to each action delay correction parameter interval in the circuit breaker database, and superimpose the action delay correction value on the preset action delay of the pole-mounted circuit breaker protection that has been set to obtain the preset action delay of the pole-mounted circuit breaker protection after correction; Jointly mark the corrected electrical data protection threshold of the pole-mounted circuit breaker and the preset action delay of the pole-mounted circuit breaker protection after correction as the final pole-mounted circuit breaker protection parameter.

7. The automatic protection and control system for the pole-mounted circuit breaker according to claim 6, characterized in that: The process of obtaining the action delay correction parameter by jointly processing the grid-connected inrush current transmission distance and communication status data is as follows: Based on the proportional relationship between the grid-connected inrush current transmission distance and the preset inrush current transmission distance reference value, dynamically adjust the correction intensity of the distance factor on the action delay through the predefined distance delay weight coefficient, and mark it as the distance correction component; Standardize and compare the packet loss rate and bit error rate with the preset packet loss rate reference value and bit error rate reference value respectively, and perform weighted fusion on the comprehensive deviation of the two through the predefined communication delay weight coefficient, and mark it as the communication quality correction component; Superimpose and integrate the distance correction component and the communication quality correction component to generate the action delay correction parameter.

8. The automatic protection and control system for an on-pole circuit breaker according to claim 1, characterized in that: The process of judging whether an abnormality occurs according to the preset distributed power inrush current data fluctuation range and the final pole-mounted circuit breaker protection parameter is as follows: The power data of the distribution line includes the line voltage, line current, and line power transmission frequency at each screening time point; The distributed power inrush current data fluctuation range includes the line voltage fluctuation range, line current fluctuation range, and line power transmission frequency fluctuation range at each screening time point; Compare the power data of the distribution line with the corrected electrical data protection threshold of the pole-mounted circuit breaker. If there is power data exceeding the corrected electrical data protection threshold of the pole-mounted circuit breaker, it is determined that an inrush current abnormality has occurred, and the circuit breaker triggers the preset protection strategy to perform a power-off operation according to the preset action delay of the pole-mounted circuit breaker protection after correction; If there is no power data exceeding the corrected electrical data protection threshold of the pole-mounted circuit breaker, continue to monitor the power data of the distribution line, and compare the power data of the distribution line with the distributed power inrush current data fluctuation range in real time to obtain the screening time points where there is power data outside the distributed power inrush current data fluctuation range, mark them as abnormal time points, and count the number of abnormal time points; Compare the number of abnormal time points with the preset number threshold of abnormal time points in the circuit breaker database. If the number of abnormal time points is greater than or equal to the number threshold of abnormal time points, it is determined that an inrush current abnormality has occurred, and the circuit breaker triggers the preset protection strategy to perform a power-off operation according to the preset action delay of the pole-mounted circuit breaker protection after correction. If the number of abnormal time points is less than the number threshold of abnormal time points, no additional operation is performed.

9. A method applied to the on-pole circuit breaker automatic protection and control system according to any one of claims 1-8, characterized in that, Including: S1. Obtain the distribution line to which the distributed power to be connected is to be connected, extract the position information of the pole-mounted circuit breaker on the distribution line, and the pole-mounted circuit breaker receives the grid-connected request of the distributed power; S2. Determine whether the distributed power source is grid-connected for the first time, and obtain the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is grid-connected for the first time, preliminarily set the protection parameters of the pole-mounted circuit breaker according to the scale information of the distributed power source and the distributed power source environment data. If the distributed power source is not grid-connected for the first time, obtain the protection parameters of the pole-mounted circuit breaker set in the previous time, and correct the protection parameters of the pole-mounted circuit breaker according to the distributed power source environment data; S3. Collect the distance between the connection point and the pole-mounted circuit breaker, and obtain the communication status data, correct the set protection parameters of the pole-mounted circuit breaker, and record the final protection parameters of the pole-mounted circuit breaker; S4. After connecting the distributed power source, detect the power data of the distribution line, and determine whether there is an abnormality according to the preset fluctuation range of the distributed power source inrush current data and the final protection parameters of the pole-mounted circuit breaker.

10. An on-pole circuit breaker automatic protection and control device, characterized in that, Including: A processor and a memory and a network interface connected to the processor; The network interface is connected to the non-volatile memory in the server; When running, the processor retrieves the computer program from the non-volatile memory through the network interface, and runs the computer program through the memory to execute the pole-mounted circuit breaker automatic protection and control method described in claim 9 above.

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