Pole-mounted circuit breaker automatic protection and control system, method and device

Abstract

The invention relates to the technical field of circuit breaker control, and particularly discloses an automatic protection and control system, method and device for a pole-mounted circuit breaker. The system comprises 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 supply is connected to the grid for the first time or not, protection parameters are dynamically set and corrected in combination with scale information and environment data of the distributed power supply, and action time delay is optimized based on communication distance and state data. The method comprises the steps of grid connection request receiving, parameter initialization and correction, anomaly detection and the like, multi-dimensional data are collected in real time through the Internet of Things technology, the surge current influence degree and environment fluctuation are quantitatively evaluated, protection parameter threshold values and time delay are dynamically matched, the problem of circuit breaker false alarm caused by surge current when a distributed power supply is connected is effectively solved, and the reliability of the distributed power supply is improved. And the stability of power grid operation and the accuracy of protection action are improved.

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 in the prior art, the present invention provides a pole-mounted 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 implemented through the following technical solutions: The first aspect of the present invention provides a pole-mounted circuit breaker automatic protection and control system, including: a grid-connected request receiving module, used to obtain the distribution line to be connected to the distributed power source, and extract the position information of the pole-mounted circuit breaker of the distribution line, and the pole-mounted circuit breaker receives the distributed power source grid-connected request.

[0008] The circuit breaker protection parameter setting module is used to determine whether the distributed power source is connected to the grid for the first time, and to obtain the scale information of the distributed power source and the distributed power source environmental data. If the distributed power source is connected to the grid for the first time, the pole-mounted circuit breaker protection parameters are preliminarily set according to the scale information of the distributed power source and the distributed power source environmental data. If the distributed power source is not connected to the grid for the first time, the pole-mounted circuit breaker protection parameters set in the adjacent time are obtained, and the pole-mounted circuit breaker protection parameters are corrected according to the distributed power source environmental data.

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

[0010] The circuit breaker protection control module is used to detect the power data of the distribution line after the distributed power supply is connected, and to determine whether an abnormality occurs based on the preset distributed power supply inrush current data fluctuation range and the final pole-mounted circuit breaker protection parameters.

[0011] Furthermore, the pole-mounted circuit breaker protection parameters are preliminarily set according to the scale information of the distributed power source and the distributed power source environmental data. The specific process is as follows: the scale information of the distributed power source includes the distributed power source power reserve, the power generation of each clean energy of the distributed power source and the distributed power source equipment density; the distributed power source environmental data includes the wind speed, water flow rate and luminous flux in the distributed power source power generation area.

[0012] According to the scale information of distributed power sources and the distributed power source environmental data, the distributed power source inrush current impact degree index is obtained, and the distributed power source inrush current impact degree index is matched with the pole-mounted circuit breaker protection parameters corresponding to each distributed power source inrush current impact degree index interval in the circuit breaker database to obtain the pole-mounted circuit breaker protection parameters for the preliminary setting of the distribution line pole-mounted circuit breaker.

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

[0014] Furthermore, the distributed power supply inrush current impact index is obtained according to the scale information of the distributed power supply and the distributed power supply environment data processing, and the specific process is: according to the proportional relationship between the distributed power supply power reserve and the preset power reserve reference value, combined with the first inrush current impact weight coefficient, it is calibrated and marked as the power reserve impact component; based on the comparative relationship between the distributed power supply equipment density and the preset reference equipment density, combined with the second inrush current impact weight coefficient, the spatial impact is quantified and marked as the spatial impact component.

[0015] Obtain the environmental data of distributed power sources at the current time point, obtain the proportion of each clean energy power generation in the total power generation, combine the ratio of the corresponding environmental parameter to the environmental parameter baseline value, generate the relative impact factor of each clean energy, superimpose the relative impact factor of each clean energy, and combine the third inrush current impact weight coefficient to quantify the environmental impact, and mark it as the comprehensive dynamic impact component of clean energy.

[0016] The power storage impact component, space impact component and comprehensive dynamic impact component of clean energy are dynamically balanced and superimposed to generate a distributed power source inrush current impact index.

[0017] Furthermore, the protection parameters of the pole-mounted circuit breaker set in the adjacent primary mode are obtained, and the protection parameters of the pole-mounted circuit breaker are corrected according to the distributed power supply environmental data. The specific process is: the distributed power supply environmental data at each monitoring time point within the preset monitoring time period is obtained, and the fluctuation amplitude of each environmental parameter is calculated based on the difference between the maximum and minimum values ​​of wind speed, water flow velocity and luminous flux within the monitoring time period, combined with the corresponding environmental parameter baseline value, and weighted superposition is performed through the preset environmental weight coefficient to generate the environmental data difference component.

[0018] The deviations of wind speed, water flow rate and light flux at each monitoring time point from the corresponding average values ​​during the monitoring period are calculated, and normalized with the preset environmental parameter benchmark differences to generate the environmental dynamic fluctuation components at each monitoring time point.

[0019] The environmental dynamic fluctuations at each monitoring time point are superimposed according to the weights, and the environmental data difference components are used together to generate the environmental adaptation parameters of the protection parameters. The protection parameters of the pole-mounted circuit breaker are corrected according to the environmental adaptation parameters of the protection parameters.

[0020] Furthermore, the protection parameters of the pole-mounted circuit breaker are corrected according to the protection parameter environment adaptation parameter. The specific process is: obtaining the protection parameter environment adaptation parameter threshold from the circuit breaker database, comparing the protection parameter environment adaptation parameter with the protection parameter environment adaptation parameter threshold, if the protection parameter environment adaptation parameter is greater than or equal to the protection parameter environment adaptation parameter threshold, then reset the pole-mounted circuit breaker protection parameters according to the initial grid-connected process.

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

[0022] Furthermore, the protection parameters of the pole-mounted circuit breaker that have been set are corrected, and the specific process is: marking the distance between the grid-connected point and the pole-mounted circuit breaker as the grid-connected surge current transmission distance; the communication status data includes packet loss rate and bit error rate; and obtaining an action delay correction parameter based on the grid-connected surge current transmission distance and the communication status data. The action delay correction parameter is used to quantify the influence of distance and communication quality on the action delay, and provide a basis for adjusting the preset delay of the pole-mounted circuit breaker protection action.

[0023] The action delay correction parameter is matched with the action delay correction value corresponding to each action delay correction parameter interval in the circuit breaker database, and the action delay correction value is superimposed with the set pole-mounted circuit breaker protection action preset delay to obtain the corrected pole-mounted circuit breaker protection action preset delay; the corrected pole-mounted circuit breaker electrical data protection threshold and the corrected pole-mounted circuit breaker protection action preset delay are jointly marked as the final pole-mounted circuit breaker protection parameter.

[0024] Furthermore, the action delay correction parameter is obtained by jointly processing the grid-connected surge current transmission distance and the communication status data. The specific process is: based on the proportional relationship between the grid-connected surge current transmission distance and the preset surge current transmission distance reference value, the correction intensity of the distance factor on the action delay is dynamically adjusted through a predefined distance delay weight coefficient, which is marked as a distance correction component.

[0025] The packet loss rate and bit error rate are compared with the preset packet loss rate benchmark value and bit error rate benchmark value respectively, and the comprehensive deviation between the two is weighted and fused through the predefined communication delay weight coefficient, marked as the communication quality correction component; the distance correction component and the communication quality correction component are superimposed and integrated to generate the action delay correction parameter.

[0026] Furthermore, the determination of whether an abnormality occurs based on the preset distributed power supply inrush current data fluctuation range and the final pole-mounted circuit breaker protection parameters is carried out 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 supply 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.

[0027] The power data of the distribution line is compared with the corrected pole-mounted circuit breaker electrical data protection threshold. If there is power data exceeding the corrected pole-mounted circuit breaker electrical data protection threshold, 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 time delay of the corrected pole-mounted circuit breaker protection action.

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

[0029] The number of abnormal time points is compared with the abnormal time point number threshold preset in the circuit breaker database. If the number of abnormal time points is greater than or equal to the abnormal time point number threshold, 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 time delay of the corrected pole-mounted circuit breaker protection action. If the number of abnormal time points is less than the abnormal time point number threshold, 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, comprising: S1. acquiring a distribution line to be connected to a distributed power source, and extracting position information of a pole-mounted circuit breaker of the distribution line, wherein the pole-mounted circuit breaker receives a distributed power source 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 environmental 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 environmental data. If the distributed power source is not connected to the grid for the first time, obtain the pole-mounted circuit breaker protection parameters set in the adjacent time, and modify the pole-mounted circuit breaker protection parameters according to the distributed power source environmental data.

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

[0033] S4. After connecting to the distributed power source, the power data of the distribution line is detected, and whether an abnormality occurs is determined based on the preset fluctuation range of the distributed power source inrush current data and the final pole-mounted circuit breaker protection parameters.

[0034] The third aspect of the present invention provides a pole-mounted circuit breaker automatic protection and control device, comprising: a processor and a memory and a network interface connected to the processor; the network interface is connected to a non-volatile memory in a server; when the processor is running, it calls 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 have at least the following advantages or beneficial effects:

[0036] (1) The present invention provides an automatic protection and control system, method and device for a pole-mounted circuit breaker, and dynamically corrects the protection parameters by combining the inrush current impact index and the environmental adaptation parameter, thereby achieving accurate matching of the threshold and the time delay, avoiding the false alarm problem caused by the traditional static threshold, and improving the response speed and protection reliability of the circuit breaker in a complex power grid environment.

[0037] (2) The present invention quantifies the impact of power reserves, equipment density and environmental parameters on inrush current, generates a dynamic index and matches it with the database, thereby solving the problem of threshold setting deviation caused by the diversity of distributed power sources, making the protection parameter initialization more in line with the actual working conditions and reducing the debugging cost and risk of the initial grid connection.

[0038] (3) The present invention analyzes the fluctuation range and discreteness of environmental data and generates correction parameters in combination with historical benchmark values, thereby realizing adaptive optimization of parameters when not connected to the grid for the first time. This helps to quickly respond to short-term environmental changes, reduce the impact of extreme weather on protection actions, and improve the stability of the power grid in a dynamic environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

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

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

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

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

[0044] It should be understood that the distributed power source in this embodiment refers to a new energy station, such as a wind power station, a solar power station, etc. Before connecting to the distribution line, the new energy station sends a grid connection request to the pole-mounted circuit breaker of the distribution line. The system automatically adjusts the pole-mounted circuit breaker parameters 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] The circuit breaker protection parameter setting module is used to determine whether the distributed power source is connected to the grid for the first time, and to obtain the scale information of the distributed power source and the distributed power source environmental data. If the distributed power source is connected to the grid for the first time, the pole-mounted circuit breaker protection parameters are preliminarily set according to the scale information of the distributed power source and the distributed power source environmental data. If the distributed power source is not connected to the grid for the first time, the pole-mounted circuit breaker protection parameters set in the adjacent time are obtained, and the pole-mounted circuit breaker protection parameters are corrected according to the distributed power source environmental data.

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

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

[0048] The circuit breaker protection control module is used to detect the power data of the distribution line after the distributed power supply is connected, and to determine whether an abnormality occurs based on the preset distributed power supply inrush current data fluctuation range and the final pole-mounted circuit breaker protection parameters.

[0049] Specifically, according to the scale information of the distributed power source and the distributed power source environmental data, the pole-mounted circuit breaker protection parameters are preliminarily set. The specific process is: the scale information of the distributed power source includes the distributed power source power reserve, the clean energy power generation of the distributed power source and the distributed power source equipment density.

[0050] It should be understood that clean energy includes wind energy, hydropower and solar energy, the power generation of each clean energy of distributed power sources refers to the power generation of each clean energy in the preset monitoring time period before grid connection, the power reserve of distributed power sources refers to the power reserve when preparing for grid connection, and the equipment density of distributed power sources refers to the ratio of the number of equipment in the new energy station to the area occupied by 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 generation environment data includes wind speed, water flow rate and light flux in the distributed power generation area.

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

[0053] According to the scale information of distributed power sources and the distributed power source environmental data, the distributed power source inrush current impact degree index is obtained, and the distributed power source inrush current impact degree index is matched with the pole-mounted circuit breaker protection parameters corresponding to each distributed power source inrush current impact degree index interval in the circuit breaker database to obtain the pole-mounted circuit breaker protection parameters for the preliminary setting of the distribution line pole-mounted circuit breaker.

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

[0055] It should be understood that the electrical data protection threshold of the pole-mounted circuit breaker in this embodiment includes a current peak value threshold, a voltage fluctuation value threshold and a frequency deviation value threshold. The current peak value refers to the maximum current value reached instantly 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 distributed power supply inrush current impact index is obtained according to the scale information of the distributed power supply and the distributed power supply environment data. The specific process is: according to the proportional relationship between the distributed power supply power reserve and the preset power reserve reference value, it is calibrated in combination with the first inrush current impact weight coefficient and marked as the power reserve impact component; based on the comparative relationship between the distributed power supply equipment density and the preset reference equipment density, the spatial impact is quantified in combination with the second inrush current impact weight coefficient and marked as the spatial impact component.

[0057] Obtain the environmental data of distributed power sources at the current time point, obtain the proportion of each clean energy power generation in the total power generation, and generate the relative impact factor of each clean energy by combining the ratio of the corresponding environmental parameter to the environmental parameter baseline value. Superimpose the relative impact factors of each clean energy, and quantify the environmental impact by combining the third inrush current impact weight coefficient, which is marked as the comprehensive dynamic impact component of clean energy. Dynamically balance and superimpose the power storage impact component, the spatial impact component and the comprehensive dynamic impact component of clean energy to generate the distributed power supply inrush current impact index.

[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 flow velocity, solar energy and luminous flux, and the environmental parameter reference value includes a wind speed reference value, a water flow velocity reference value, and a luminous flux reference value. In this embodiment, the power reserve reference value, the reference equipment density, the environmental parameter reference value, and the first inrush current influence weight coefficient, the second inrush current influence weight coefficient, and the third inrush current influence 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 influence weight coefficient, the second inrush current influence weight coefficient and the third inrush current influence weight coefficient correspond to different weights of power storage influence, space influence and environmental influence, respectively, and can be adjusted according to actual conditions. For example, the power storage, equipment density or environmental data and the first inrush current influence weight coefficient, the second inrush current influence weight coefficient or the third inrush current influence weight coefficient preset in the clinical trial database form a mapping set, and the first inrush current influence weight coefficient, the second inrush current influence weight coefficient or the third inrush current influence weight coefficient are obtained by inputting the mapping set according to the power storage, equipment density or environmental data, wherein the mapping relationship is a one-to-one relationship, and the value range of the weight factor in this embodiment is between 0 and 1.

[0060] In a specific embodiment, the distributed power supply inrush current impact index is obtained as follows:

[0061] ;

[0062] ;

[0063] In the formula, Indicates the impact index of distributed power supply inrush current, is the preset first inrush current influence weight coefficient, is the preset second inrush current influence weight coefficient, is the preset third inrush current influence weight coefficient, CN is the distributed power reserve, is the preset power reserve benchmark value, S is the density of distributed power generation equipment, is the preset benchmark equipment density, FV represents wind speed, SV represents water flow velocity, GL represents luminous flux, Indicates the preset wind speed reference value. Indicates the preset water flow rate reference value. Indicates the preset luminous flux reference value, k indicates the number of each clean energy, k=1,2,3, represents the power generation of the kth clean energy, where represents the amount of wind power generated, represents the amount of hydroelectric power generated, Indicates the amount of solar power generated.

[0064] In this embodiment, the distributed power supply inrush current impact index is calculated by the distributed power supply power reserve, the distributed power supply equipment density and the power generation of each clean energy source. The lower the distributed power supply power reserve, or the greater the distributed power supply equipment density and the power generation of each clean energy source, the higher the distributed power supply inrush current impact index. The parameters in the formula affect each other. The environmental parameters indirectly affect the charging and discharging state of the power reserve by affecting the power generation. The power reserve can reversely constrain the impact intensity of environmental fluctuations on the line. As an energy buffer unit, the power reserve directly affects the ability to absorb power generation fluctuations. At the same time, the density of distributed power supply equipment directly affects the power generation of each clean energy source. The greater the density of distributed power supply equipment, the more likely it is to increase the parasitic capacitance of the line, which will amplify the transient oscillation when the inrush current occurs.

[0065] This embodiment quantitatively evaluates the impact of distributed power generation access on the stability of the distribution line, matches the quantitative data with the preset pole-mounted circuit breaker protection parameters in real time, dynamically sets the electrical protection threshold and action delay, and can be optimized in real time according to the comprehensive impact of the environment, energy storage, and power generation, thereby reducing the probability of false operation and refusal to operate.

[0066] Specifically, the protection parameters of the pole-mounted circuit breaker set in the adjacent primary state are obtained, and the pole-mounted circuit breaker protection parameters are corrected according to the distributed power supply environmental data. The specific process is: obtain the distributed power supply environmental data at each monitoring time point within the preset monitoring time period, based on the difference between the maximum and minimum values ​​of wind speed, water flow rate and luminous flux within the monitoring time period, combined with the corresponding environmental parameter baseline 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.

[0067] Calculate the deviations of wind speed, water flow rate and luminous flux at each monitoring time point from the corresponding average values ​​during the monitoring period, normalize them with the preset environmental parameter benchmark differences, and generate the environmental dynamic fluctuation components at each monitoring time point; superimpose the environmental dynamic fluctuation quantities at each monitoring time point according to the weights, and generate the environmental adaptation parameters of the protection parameters together with the environmental data difference components.

[0068] It should be understood that the environmental weight coefficients in this embodiment include an environmental wind speed weight coefficient, an environmental water flow velocity weight coefficient, and an environmental luminous flux weight coefficient. The wind speed reference difference, the water flow velocity reference difference, and the luminous flux reference difference are statistically derived 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 flow velocity weight coefficient, and the environmental luminous flux weight coefficient are dynamically determined by the type of distributed power source. For example, a mapping set is established based on historical data to establish an environmental weight coefficient and the proportion of power generation corresponding to the environmental parameters of a new energy station. By inputting the proportion of 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 calculated by comprehensively calculating the difference component of the environmental data and the dynamic fluctuation component of the environment. The difference component of the environmental data is used to reflect the maximum fluctuation amplitude of the wind speed, water flow velocity and light flux during the monitoring period. The dynamic fluctuation component of the environment is normalized by the deviation of the environmental parameters at each monitoring time point from the average value, and quantifies the degree of deviation of the real-time environmental fluctuation from the historical average state. When the extreme difference of wind speed, water flow velocity and light flux is larger, or the discreteness of the environmental data during the monitoring period is larger, the environmental adaptation parameter of the protection parameter is also larger.

[0070] In a specific embodiment, the protection parameter environment adaptation parameter is obtained as follows:

[0071] ;

[0072] ;

[0073] ;

[0074] In the formula, Indicates the protection parameter environment adaptation parameter, represents the difference component of environmental data, Represents the preset ambient wind speed weight coefficient, Represents the preset environmental water flow velocity weight coefficient, Represents the preset ambient light flux weight coefficient, represents the wind speed at the ith monitoring time point, represents the water flow velocity at the ith monitoring time point, represents the luminous flux at the i-th monitoring time point, ∆FV represents the wind speed reference difference, ∆SV represents the water flow velocity reference difference, ∆GL represents the luminous flux reference difference, Indicates the maximum wind speed during the monitoring period. Indicates the minimum wind speed during the monitoring period. Indicates the maximum water flow rate during the monitoring period. Indicates the minimum water flow rate during the monitoring period. Indicates the maximum luminous flux during the monitoring period. It represents the minimum luminous flux during the monitoring 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] This embodiment converts static parameter correction into a dynamic balance process by quantifying the extremes and discreteness of environmental fluctuations. Weight distribution is performed through environmental weight coefficients to differentiate the correction strategies of different types of distributed power sources, thereby improving the accuracy of correction of pole-mounted circuit breaker protection parameters. The environmental adaptation parameters of the protection parameters and the distributed power source inrush current impact index constitute a collaborative correction system. By correcting the adaptive parameters when not connected to the grid for the first time, the real-time compensation of short-term environmental fluctuations is analyzed to form a closed-loop optimization mechanism.

[0076] The protection parameters of the pole-mounted circuit breaker are modified according to the protection parameter environment adaptation parameters.

[0077] Specifically, the protection parameters of the pole-mounted circuit breaker are corrected according to the protection parameter environment adaptation parameter. The specific process is: obtain the protection parameter environment adaptation parameter threshold from the circuit breaker database, compare the protection parameter environment adaptation parameter with the protection parameter environment adaptation parameter threshold, if the protection parameter environment adaptation parameter is greater than or equal to the protection parameter environment adaptation parameter threshold, then reset the pole-mounted circuit breaker protection parameters according to the initial grid-connected process.

[0078] If the protection parameter environmental adaptation parameter is less than the protection parameter environmental adaptation parameter threshold, the protection parameter environmental adaptation parameter is matched with the pole-mounted circuit breaker electrical data protection threshold correction value corresponding to each protection parameter environmental adaptation parameter interval in the circuit breaker database, and the pole-mounted circuit breaker electrical data protection threshold set at the adjacent time is superimposed with the pole-mounted circuit breaker electrical data protection threshold correction value to obtain the corrected pole-mounted circuit breaker electrical data protection threshold.

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

[0080] Specifically, the set pole-mounted circuit breaker protection parameters are corrected, and the specific process is: marking the distance between the grid-connected point and the pole-mounted circuit breaker as the grid-connected inrush current transfer distance.

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

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

[0083] It should be understood that the communication status data in this embodiment refers to the packet loss rate and bit error rate when data is exchanged between the grid connection point and the pole-mounted circuit breaker, which 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-connected surge current transmission distance and the communication status data. The action delay correction parameter is used to quantify the influence of the distance and communication quality on the action delay, and provide a basis for adjusting the preset delay of the pole-mounted circuit breaker protection action.

[0085] The action delay correction parameter is matched with the action delay correction value corresponding to each action delay correction parameter interval in the circuit breaker database, and the action delay correction value is superimposed with the set pole-mounted circuit breaker protection action preset delay to obtain the corrected pole-mounted circuit breaker protection action preset delay.

[0086] The corrected pole-mounted circuit breaker electrical data protection threshold and the corrected pole-mounted circuit breaker protection action preset time delay are jointly marked as the final pole-mounted circuit breaker protection parameters.

[0087] Specifically, the action delay correction parameter is obtained by jointly processing the grid-connected surge current transmission distance and the communication status data. The specific process is: based on the proportional relationship between the grid-connected surge current transmission distance and the preset surge current transmission distance reference value, the correction intensity of the distance factor on the action delay is dynamically adjusted through the predefined distance delay weight coefficient, which is marked as the distance correction component.

[0088] The packet loss rate and bit error rate are compared with the preset packet loss rate benchmark value and bit error rate benchmark value respectively, and the comprehensive deviation between the two is weighted and fused through the predefined communication delay weight coefficient, which is marked as the communication quality correction component.

[0089] The distance correction component and the communication quality correction component are superimposed and integrated 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 impact of wind speed on communication quality, the wind speed is mapped to the distance delay correction weight coefficient and the communication delay correction weight coefficient in the circuit breaker database to form a mapping set, and the real-time wind speed is input into the mapping set to obtain the current corresponding distance delay correction weight coefficient and communication delay correction weight coefficient.

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

[0092] ;

[0093] ;

[0094] In the formula, Indicates the action delay correction parameter, Indicates the preset distance delay correction weight coefficient, Represents the preset communication delay correction weight coefficient, Indicates the grid-connected surge current transmission distance, Indicates the preset surge current transfer distance reference value. Indicates the packet loss rate, indicates the preset packet loss rate benchmark value, WM indicates the bit error rate, Indicates the preset bit error rate reference value.

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

[0096] This embodiment further refines and corrects the action delay of the pole-mounted circuit breaker according to the communication quality and 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, whether an abnormality occurs is determined based on the preset fluctuation range of the distributed power supply inrush current data and the final pole-mounted circuit breaker protection parameters. The specific process is: 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 by 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 supply inrush current data fluctuation interval includes a line voltage fluctuation interval, a line current fluctuation interval and a line power transmission frequency fluctuation interval at each screening time point.

[0100] It should be understood that in this embodiment, the fluctuation range of the distributed power supply inrush current data is obtained by statistically analyzing the historical inrush current events of distributed power supply access, 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] The power data of the distribution line is compared with the corrected pole-mounted circuit breaker electrical data protection threshold. If there is power data exceeding the corrected pole-mounted circuit breaker electrical data protection threshold, 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 time delay of the corrected pole-mounted circuit breaker protection action.

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

[0103] The number of abnormal time points is compared with the abnormal time point number threshold preset in the circuit breaker database. If the number of abnormal time points is greater than or equal to the abnormal time point number threshold, 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 time delay of the corrected pole-mounted circuit breaker protection action. If the number of abnormal time points is less than the abnormal time point number threshold, no additional operation is performed.

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

[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 environmental 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 environmental data. If the distributed power source is not connected to the grid for the first time, obtain the pole-mounted circuit breaker protection parameters set in the adjacent time, and modify the pole-mounted circuit breaker protection parameters according to the distributed power source environmental data.

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

[0107] S4. After connecting to the distributed power source, the power data of the distribution line is detected, and whether an abnormality occurs is determined based on the preset fluctuation range of the distributed power source inrush current data and the final pole-mounted circuit breaker protection parameters.

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

[0109] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A pole mounted circuit breaker automatic protection and control system, characterized in that: include: A grid connection request receiving module is used to obtain the distribution line to be connected to the distributed power source and extract the position information of the pole-mounted circuit breaker of the distribution line. The pole-mounted circuit breaker receives the grid connection request of the distributed power source; The circuit breaker protection parameter setting module is used to 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 environmental data. If the distributed power source is connected to the grid for the first time, the pole-mounted circuit breaker protection parameters are preliminarily set according to the scale information of the distributed power source and the distributed power source environmental data. If the distributed power source is not connected to the grid for the first time, the pole-mounted circuit breaker protection parameters set in the adjacent time are obtained, and the pole-mounted circuit breaker protection parameters are corrected according to the distributed power source environmental data; The circuit breaker protection parameter correction module 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 pole-mounted circuit breaker protection parameters, and record the final pole-mounted circuit breaker protection parameters; The circuit breaker protection control module is used to detect the power data of the distribution line after the distributed power supply is connected, and to determine whether an abnormality occurs based on the preset distributed power supply inrush current data fluctuation range and the final pole-mounted circuit breaker protection parameters.

2. According to claim 1, a pole mounted circuit breaker automatic protection and control system, characterized in that: According to the scale information of the distributed power source and the distributed power source environment data, the protection parameters of the pole-mounted circuit breaker are preliminarily set. The specific process is as follows: The scale information of the distributed power source includes the power reserve of the distributed power source, the power generation of each clean energy of the distributed power source and the density of the distributed power source equipment; The distributed power environment data includes wind speed, water flow rate and light flux in the distributed power generation area; According to the scale information of the distributed power source and the distributed power source environment data, the distributed power source inrush current impact degree index is obtained, and the distributed power source inrush current impact degree index is matched with the pole-mounted circuit breaker protection parameters corresponding to each distributed power source inrush current impact degree index interval in the circuit breaker database to obtain the pole-mounted circuit breaker protection parameters of the distribution line pole-mounted circuit breaker that are initially set; The distributed power supply inrush current impact index is used to quantitatively evaluate the impact of distributed power supply access on the stability of the distribution line, and the pole-mounted circuit breaker protection parameters include the pole-mounted circuit breaker electrical data protection threshold and the pole-mounted circuit breaker protection action preset delay.

3. According to claim 2, a pole mounted circuit breaker automatic protection and control system is characterized in that: The distributed power supply inrush current impact index is obtained according to the scale information of the distributed power supply and the distributed power supply environment data. The specific process is as follows: According to the proportional relationship between the electric reserve of the distributed power source and the preset electric reserve reference value, the first inrush current influence weight coefficient is combined for calibration and marked as the electric reserve influence component; Based on the comparison between the density of distributed power supply equipment and the preset reference equipment density, the spatial impact is quantified in combination with the second inrush current impact weight coefficient and marked as a spatial impact component; Obtain the environmental data of the distributed power source at the current time point, obtain the proportion of each clean energy power generation in the total power generation, combine the ratio of the corresponding environmental parameter to the environmental parameter baseline value, generate the relative impact factor of each clean energy, superimpose the relative impact factor of each clean energy, and combine the third inrush current impact weight coefficient to quantify the environmental impact, and mark it as the comprehensive dynamic impact component of clean energy; The power storage impact component, space impact component and comprehensive dynamic impact component of clean energy are dynamically balanced and superimposed to generate a distributed power source inrush current impact index.

4. The automatic protection and control system for a pole mounted circuit breaker according to claim 1, characterized in that: The process of obtaining the protection parameters of the pole-mounted circuit breaker set adjacent to the primary power supply and correcting the protection parameters of the pole-mounted circuit breaker according to the distributed power supply environment data is as follows: Obtain the distributed power environmental data at each monitoring time point within the preset monitoring time period, and calculate the fluctuation range of each environmental parameter based on the difference between the maximum and minimum values ​​of wind speed, water flow rate and luminous flux within the monitoring time period, combined with the corresponding environmental parameter reference value, and perform weighted superposition through the preset environmental weight coefficient to generate the environmental data difference component; Calculate the deviation of wind speed, water flow rate and light flux at each monitoring time point from the corresponding average value during the monitoring period, and perform normalization processing based on the preset environmental parameter benchmark difference to generate the environmental dynamic fluctuation component at each monitoring time point; The environmental dynamic fluctuations at each monitoring time point are superimposed according to the weights, and together with the difference components of the environmental data, the environmental adaptation parameters of the protection parameters are generated; The protection parameters of the pole-mounted circuit breaker are modified according to the protection parameter environment adaptation parameters.

5. The automatic protection and control system for a pole mounted circuit breaker according to claim 4, characterized in that: The protection parameters of the pole-mounted circuit breaker are modified according to the protection parameter environment adaptation parameters, and the specific process is as follows: Obtaining a protection parameter environment adaptation parameter threshold from a circuit breaker database, comparing the protection parameter environment adaptation parameter with the protection parameter environment adaptation parameter threshold, and if the protection parameter environment adaptation parameter is greater than or equal to the protection parameter environment adaptation parameter threshold, resetting the pole-mounted circuit breaker protection parameter according to the initial grid-connected process; If the protection parameter environmental adaptation parameter is less than the protection parameter environmental adaptation parameter threshold, the protection parameter environmental adaptation parameter is matched with the pole-mounted circuit breaker electrical data protection threshold correction value corresponding to each protection parameter environmental adaptation parameter interval in the circuit breaker database, and the pole-mounted circuit breaker electrical data protection threshold set at the adjacent time is superimposed with the pole-mounted circuit breaker electrical data protection threshold correction value to obtain the corrected pole-mounted circuit breaker electrical data protection threshold.

6. The automatic protection and control system for a pole mounted circuit breaker according to claim 1, characterized in that: The specific process of modifying the protection parameters of the pole-mounted circuit breaker that has been set is as follows: The distance between the grid connection point and the pole-mounted circuit breaker is marked as the grid-connected inrush current transfer distance; The communication status data includes packet loss rate and bit error rate; The action delay correction parameter is obtained by jointly processing the grid-connected surge current transmission distance and the communication status data. The action delay correction parameter is used to quantify the influence of the distance and the communication quality on the action delay, and provide a basis for adjusting the preset 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 with the set pole-mounted circuit breaker protection action preset delay to obtain the corrected pole-mounted circuit breaker protection action preset delay; The corrected pole-mounted circuit breaker electrical data protection threshold and the corrected pole-mounted circuit breaker protection action preset time delay are jointly marked as the final pole-mounted circuit breaker protection parameters.

7. The automatic protection and control system for a pole mounted circuit breaker according to claim 6, characterized in that: The action delay correction parameter is obtained by jointly processing the grid-connected inrush current transmission distance and the communication status data. The specific process is as follows: Based on the proportional relationship between the grid-connected surge current transmission distance and the preset surge current transmission distance reference value, the correction intensity of the distance factor on the action delay is dynamically adjusted through the predefined distance delay weight coefficient, which is marked as the distance correction component; The packet loss rate and the bit error rate are standardized and compared with the preset packet loss rate benchmark value and the bit error rate benchmark value respectively, and the comprehensive deviation between the two is weighted and fused by the predefined communication delay weight coefficient, and marked as the communication quality correction component; The distance correction component and the communication quality correction component are superimposed and integrated to generate the action delay correction parameter.

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

9. A method for applying to a pole mounted circuit breaker automatic protection and control system as claimed in any one of claims 1 to 8, characterized in that: include: S1. Obtain the distribution line to be connected to the distributed power source, and extract the position information of the pole-mounted circuit breaker of the distribution line, and the pole-mounted circuit breaker receives the distributed power source grid connection request; 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 environmental data. If the distributed power source is connected to the grid for the first time, then preliminarily set the pole-mounted circuit breaker protection parameters according to the scale information of the distributed power source and the distributed power source environmental data. If the distributed power source is not connected to the grid for the first time, obtain the pole-mounted circuit breaker protection parameters set in the adjacent time, and modify the pole-mounted circuit breaker protection parameters according to the distributed power source environmental data; S3. Collect the distance between the grid point and the pole-mounted circuit breaker, obtain the communication status data, modify the set pole-mounted circuit breaker protection parameters, and record the final pole-mounted circuit breaker protection parameters; S4. After connecting to the distributed power source, the power data of the distribution line is detected, and whether an abnormality occurs is determined based on the preset distributed power source inrush current data fluctuation range and the final pole-mounted circuit breaker protection parameters.

10. A pole mounted circuit breaker automatic protection and control device, characterized in that: include: Processors and memory and network interfaces connected to the processors; The network interface is connected to a 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 automation protection and control system described in any one of claims 1-8.

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