Multi-dimensional monitoring and control method and system for new energy stability control execution station

Abstract

The invention discloses a multi-dimensional monitoring and control method and system for a new energy stability control execution station, and the method comprises the steps: configuring two sets of stability control devices at the new energy stability control execution station, and collecting the operation state information of a current collection line; each set of stability control device judges the reliability in real time, issues the data information of the device to another device, and receives the data information of the other device; each set of stable control device sets the cutting priority on line based on the operation state information of each current collection line, calculates the total cuttable capacity and sends the total cuttable capacity to a superior station; after the new energy stability control execution station receives the amount needing to be cut sent by the superior station, undercut amount judgment is sequentially conducted from high to low according to the cutting priority sequence of all the current collection lines till the undercut amount is not larger than an undercut fixed value or traversal of the cuttable elements is finished, and the stability control device acts to cut off the corresponding current collection lines. Accurate calculation of collected and uploaded information and accurate execution of stability control measures of the new energy stability control execution station are realized.

Description

Technical Field

[0001] This invention belongs to the field of automatic control technology for power grid safety and stability, and specifically relates to a multi-dimensional monitoring and control method and system for a new energy stability control execution station. Background Technology

[0002] The installed capacity and proportion of new energy power generation are gradually increasing. When system emergency failures occur, new energy power sources are increasingly being shut down. New energy actuator station stability control devices often employ dual independent configurations, with no information exchange between the two systems. Data collection and execution of stability control measures are carried out independently, raising concerns about data security and reliability. Data exchange between stability control devices often relies on 2M or FT3 interfaces. The content of data exchange often requires customized code writing based on devices from different manufacturers. When the two sets of equipment come from different manufacturers, the complexity and difficulty of communication increase significantly due to differences in technical standards and communication protocols. This, to some extent, restricts the overall effectiveness of the new energy stability control system, necessitating the development of effective technical solutions.

[0003] When the power grid encounters an emergency fault, renewable energy plants typically determine the priority order for disconnecting collectors based on pre-set priority values ​​or the real-time active power of the collectors. However, renewable energy generation power fluctuates significantly. If collector disconnection is determined solely based on real-time active power, it can easily trigger line overload during the fault period, expanding the disconnection scope and leading to severe over-disconnection, resulting in economic losses for renewable energy plants. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a multi-dimensional monitoring and control method and system for new energy plant stability control stations, aiming to achieve flexible interaction of information collected by the dual stability control devices of new energy plants, accurate calculation of collected and transmitted information, and precise execution of stability control measures.

[0005] To achieve the above-mentioned objectives, the present invention specifically adopts the following technical solution.

[0006] This invention discloses a multi-dimensional monitoring and control method for a new energy stability control station, the method comprising the following steps: S1, Two sets of stability control devices are configured in the new energy stability control execution station. Each set of stability control devices collects the operating status information of all collector lines of the new energy plant. S2, each stability control device assesses its own reliability in real time and determines data interaction and output control strategies based on its own reliability. During the data interaction process, based on the mirror self-retrieval information interaction mechanism, the data information of this stability control device is published point-to-point to another stability control device, while subscribing to and receiving data information from another stability control device. The data information includes the operating status information of all collector lines of the new energy plant, the device fault flag bit of the stability control device, and the output status. S3, each set of stability control devices compares its own collected data and received data, and based on the operating status information of each collector line, adjusts the disconnection priority of each collector line online, and calculates the total disconnectable capacity of the new energy stability control execution station and sends it to the superior station. S4. When the new energy stability control execution station receives the required cut-off quantity from the superior station, it judges the undercut quantity in descending order of the cut-off priority of each collector line until the undercut quantity is not greater than the undercut setting value or the traversal of the cut-off collector lines is completed, and the stability control device outputs the action to cut off the corresponding collector line.

[0007] More preferably, In S1, the operating status information of the collector lines includes the status flag bits, single-phase voltage, single-phase current, and predicted active power of each collector line; wherein, the status flag bits include cut-off, operation, shutdown, and maintenance, and the predicted active power is collected by the stability control device from the power prediction equipment in the new energy power plant; the real-time active power of each collector line can be calculated based on the operating status information of the collector lines.

[0008] More preferably, In S2, each stability control unit calculates its own reliability index e in real time to determine its data interaction and exit control strategies, specifically: Each stability control device calculates its own reliability index e in real time. When e < e1, the output of this stability control device is locked, and a device fault flag is sent to another stability control device. When e1 ≤ e < e2, the device fault flag is sent to another stability control device, and the output status of the other stability control device is copied. After a delay τ, the output of this stability control device is triggered. When e ≥ e2, the operating status information of all collector lines of the new energy power plant collected by this stability control device is sent to another stability control device in real time, and the output of this stability control device is triggered immediately according to the received tripping command. Here, τ is a preset delay setting, e1 is the first reliability index setting, e2 is the second reliability index setting, and 0 < e1 < e2 < 1. The larger the reliability index, the higher the reliability of the stability control device.

[0009] More preferably, The reliability index e is determined in the following manner: The system acquires five indicators: alarm information r1, device temperature r2, operating voltage r3, status flag acquisition value r4, and real-time active power acquisition value r5 of each collector. It assigns a corresponding evaluation coefficient to each indicator, and the sum of the evaluation coefficients of the five indicators is 1. The system then multiplies the value of each indicator by its corresponding evaluation coefficient and sums the results to obtain the reliability index e corresponding to each stability control device. Specifically, if the stability control device has a Type I alarm, the reliability index e=0; if the stability control device has a Type II alarm, then r1=α, where 0<α<1; if the stability control device has no alarm, then r1=1; the impact of Type I alarms is greater than that of Type II alarms; the number of collectors with abnormal state combinations collected by the stability control device is counted, and the proportion of these to the total number of collectors is calculated as k; the abnormal state combinations include: a single collector's status flag bit containing both operation and shutdown, a single collector's status flag bit containing both operation and maintenance, and a single collector's status flag bit containing both operation, shutdown, and maintenance; when k≥10%, e=0; when 5%≤k<10%, r4=β; when 1%≤k<5%, r4=γ; when k<1%, r4=1; and 0<β<γ<1.

[0010] More preferably, S3 specifically includes: Based on the reliability index of the stability control device and the status flag bits of each collector line, determine the collector lines that can be disconnected; calculate the comprehensive power generation of each collector line that can be disconnected. All collector lines are randomly numbered from 1 to m. For each collector line that is allowed to be disconnected, its disconnection priority is set from 1 to n in descending order of its comprehensive power generation capacity. The smaller the value, the higher the disconnection priority. If multiple collector lines have the same comprehensive power generation capacity, the random number of the collector line is used as the basis, and the collector line with the smaller number has a smaller disconnection priority. For the remaining collector lines that are not allowed to be disconnected, their disconnection priority is set to 0. Here, n is the total number of collector lines that are allowed to be disconnected, m is the total number of all collector lines in the new energy power station, and n <= m.

[0011] More preferably, The method for determining the permissible cut-off collectors based on the reliability index of the stability control device and the status flag bits of each collector is as follows: The operation of disconnecting the collector wire is only permitted when at least one set of stable control devices meets the reliability index e > e2. If only a single stability control device satisfies e>e2, then the cut-off determination is made based on the operating status of the collector wire collected by this stability control device. The cut-off of the collector wire is allowed only when both the cut-off permission flag and the operating flag are set to 1. If both stability control devices satisfy e>e2, then the cut-off of the collector wire is allowed only when both the cut-off permission flag and the operating flag are set to 1 in each stability control device.

[0012] More preferably, The combined power generation capacity of each collector wire that is allowed to be disconnected is determined as follows:

[0013] in, For the first i The total power generation capacity of the collector wires that are allowed to be cut. For the first i The real-time active power factor of the collector wires that are allowed to be disconnected. For the first i The predicted active power factor of the collector wires that are allowed to be cut off; , The first i Real-time active power and predicted active power of the collector wires that are allowed to be disconnected; If only a single stability control device meets its own reliability index e>e2, then and Take the data collected by this set of stability control devices; if both sets of stability control devices meet their own reliability index e>e2, then and Take the smaller value of the data collected from the two sets of stabilization control devices.

[0014] More preferably, No. i Real-time active power factor of the collector wires that are allowed to be disconnected and predicted active power coefficient It shall be determined in the following manner:

[0015]

[0016] in, For the first i The relative deviation between the predicted active power and the actual active power of the power distribution cable. For low deviation threshold, It is a high deviation threshold, and satisfies ; and It can be determined based on the proportion of new energy output in the energy system.

[0017] More preferably, In S3, the calculation of the total switchable capacity of the new energy stability control execution station and its transmission to the upper-level station specifically includes: The sum of the real-time active power of all allowed disconnected collectors in the new energy stabilization and control execution station is calculated as the total disconnectable capacity of the new energy stabilization and control execution station; The two sets of stabilization control devices calculate the total switchable capacity based on the operating status information collected by each device. If neither of the two stability control devices meets its own reliability index e>e2, the total switchable capacity sent up is 0; if only one of the two stability control devices does not meet its own reliability index e>e2, the total switchable capacity calculated by the other stability control device is sent to the superior station; if both stability control devices meet their own reliability index e>e2, and the relative deviation of the total switchable capacity calculated by the two stability control devices is no greater than 5%, the larger value of the total switchable capacity calculated by the two stability control devices is sent to the superior station; otherwise, the smaller value of the total switchable capacity calculated by the two stability control devices is sent to the superior station.

[0018] Another aspect of the present invention discloses a multi-dimensional monitoring and control system for a new energy stability control execution station based on the aforementioned method, including a current collector power line operation status information acquisition module, a dual-set stability control device data information interaction module, a new energy stability control execution station switchable capacity transmission module, and a stability control device output action module. The collector line operation status information acquisition module is equipped with two sets of stability control devices at the new energy stability control execution station. Each set of stability control devices collects the operation status information of all collector lines in the new energy power plant. The system includes a dual-set data information exchange module for stability control devices. Each stability control device assesses its own reliability in real time and determines its data exchange and output control strategies based on its own reliability. During the data exchange process, based on a mirror self-retrieval information exchange mechanism, the system publishes its data information point-to-point to the other stability control device and simultaneously subscribes to and receives data information from the other stability control device. The data information includes the operating status information of all collector lines in the new energy plant, the device fault flag bits of the stability control device, and the output status. The new energy stability control execution station's cut-off capacity transmission module compares its own collected data with the received data, and based on the operating status information of each collector line, adjusts the cut-off priority of each collector line online, and calculates the total cut-off capacity of the new energy stability control execution station to be transmitted to the superior station. When the new energy stability control execution station receives the required cut-off quantity from the superior station, the output action module of the stability control device judges the undercut quantity in descending order of the cut-off priority of each collector line until the undercut quantity is not greater than the undercut setting value or the cut-off element traversal is completed, and the output action of the stability control device cuts off the corresponding collector line.

[0019] The beneficial effects of this invention are compared with those of the prior art: 1. By using a redundant configuration of dual-set stability control devices, combined with a mirror self-acquisition information interaction mechanism, each device can determine its own reliability in real time and achieve point-to-point data interaction and sharing. This design greatly improves the system's fault tolerance, avoids monitoring and control failures caused by the failure of a single device, and significantly improves the operational stability of the new energy stability control system, while effectively ensuring compatibility between equipment from different manufacturers.

[0020] 2. Propose reliability indicators for stability control devices to enable quantitative calculation of the reliability of stability control devices and improve the reliability and credibility of data collected by stability control devices.

[0021] 3. Based on multi-dimensional monitoring data such as collector line operation indicators, real-time and predicted active power, the priority of collector line disconnection for new energy power plants can be calculated in real time, which can effectively reduce the probability of recurrence of overload faults during grid faults. Attached Figure Description

[0022] Figure 1 This is a flowchart of the multi-dimensional monitoring and control method for the new energy stability control execution station of the present invention; Figure 2 This is a system architecture diagram of the new energy stability control execution station in an embodiment of the present invention. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0024] Example 1: like Figure 1 As shown, this invention discloses a multi-dimensional monitoring and control method for a new energy stability control execution station, comprising the following steps: S1, Two sets of stability control devices are configured in the new energy stability control execution station. Each set of stability control devices collects the operating status information of all collector lines of the new energy plant. In the above technical solution, in step S1, the new energy power station includes wind farms and photovoltaic stations. The operating status information of the collector lines includes the status flags, single-phase voltage, single-phase current, and predicted active power of each collector line. The status flags include tripping allowed, running, out of service, and under maintenance. The real-time active power, real-time reactive power, cut-off capacity, and total cut-off capacity of the station can be calculated from the operating status information of the collector lines.

[0025] Power prediction equipment is configured in new energy power plants, and the predicted active power is collected in real time from the power prediction equipment by the stability control device.

[0026] S2, each stability control device assesses its own reliability in real time and determines data interaction and output control strategies based on its own reliability. During the data interaction process, based on the mirror self-retrieval information interaction mechanism, the data information of this stability control device is published point-to-point to another stability control device, while subscribing to and receiving data information from another stability control device. The data information includes the operating status information of all collector lines of the new energy plant, the device fault flag bit of the stability control device, and the output status. Between the two sets of stable control devices, Ethernet communication is used, employing the GOOSE communication protocol to transmit the electrical and switching quantities collected and calculated by each device. Before sending the data collected by one set, the reliability of the device itself must be verified. If the verification conditions are not met, a device fault flag is sent to the other set of devices. The mirror-based self-retrieval information interaction mechanism, since the information collected by the two sets of devices is identical and mirrored, allows for the autonomous selection of the amount of data exchanged based on the device's usage scenario via device panel buttons or auxiliary software tools.

[0027] In the above technical solution, in step S2, each stability control device calculates its own reliability index e in real time to determine its data interaction and output control strategies, specifically as follows: Each stability control device calculates its own reliability index e in real time. When e < e1, the output of this stability control device is locked, and a device fault flag is sent to another stability control device. When e1 ≤ e < e2, the device fault flag is sent to another stability control device, and the output status of the other stability control device is copied. After a delay τ, the output of this stability control device is triggered. When e ≥ e2, the operating status information of all collector lines of the new energy power plant collected by this stability control device is sent to another stability control device in real time, and the output of this stability control device is triggered immediately according to the received tripping command. Here, τ is a preset delay setting, e1 is the first reliability index setting, e2 is the second reliability index setting, and 0 < e1 < e2 < 1. The larger the reliability index, the higher the reliability of the stability control device.

[0028] In the above technical solution, the reliability index 'e' of the stability control device is obtained by comprehensively evaluating five aspects: device alarm information, device temperature, operating voltage, collected values ​​of operating status indicators of each collector line, and collected values ​​of real-time active power of each collector line. The specific calculation method is as follows: The evaluation coefficients for five indicators are set as k1, k2, k3, k4, and k5 respectively, for device alarm information r1, device temperature r2, working voltage r3, the collected value of the operating status flag of each collector r4, and the collected value of the real-time active power of each collector r5, and k1+k2+k3+k4+k5=1. e=r1*k1+r2*k2+r3*k3+r4*k4+r5*k5 If the stability control device has a Type I alarm, the reliability index e=0; if the stability control device has a Type II alarm, then r1=α, where 0<α<1; if the stability control device has no alarm, then r1=1.

[0029] Specifically, Class I and Class II alarms are determined according to the provisions of State Grid Corporation of China's enterprise standard Q / GDW 11632 regarding the alarm categories of safety and stability control devices, as follows: Class I alarms: CPU plug-in malfunction in policy function, analog signal acquisition error, output malfunction; Class II alarms: Voltage transformer disconnection (by interval), current transformer disconnection (by interval), management CPU plug-in abnormality, protection trip input abnormality (by interval), other set operation input abnormality, switch position signal abnormality (by interval), long-term start alarm, overload alarm, abnormal operating mode, abnormal mode pressure plate, abnormal bypass pressure plate, abnormal slave communication, abnormal slave operation, abnormal to XX channel, inconsistent to XX channel pressure plate, interrupted command link to XX channel, abnormal communication between sets within the station, abnormal time synchronization, abnormal time synchronization signal status, abnormal time synchronization service status, abnormal time jump detection test status.

[0030] The device temperature r2, operating voltage r3, and real-time active power acquisition values ​​r5 of each collector line are all within a certain range, indicating the device is operating at its best. A trapezoidal membership function is used to normalize these values. Specifically, the real-time active power acquisition value r5 of each collector line needs to be calculated separately for each collector line before averaging across all collector lines in the station. The trapezoidal membership function calculation method is as follows: When x a ≤x≤x b t(x) = 1; When x≤x min or x≥x max When t(x) = 0; When x min <x<x a When, t(x) = (xxmin ) / (x a -x min ); When x b <x<x max When, t(x) = (x max -x) / (x max -x b ); Where x is the index to be normalized; x min x max These are the minimum and maximum values ​​of the corresponding indicators to be normalized; x a x b These represent the lower and upper limits of the indicator to be normalized within a reasonable operating range; x min x max x a and x b All are determined based on design parameters.

[0031] Determine whether there are any abnormal state combinations in the status of each collector wire collected by the stability control device, count the number of collector wires with abnormal state combinations, and calculate the proportion of them to the total number of collector wires as k; the abnormal state combinations include: simultaneously reporting operation and shutdown, operation and maintenance, or operation, shutdown and maintenance coexisting. When k≥10%, e=0; when 5%≤k<10%, r4=β; when 1%≤k<5%, r4=γ; when k<1%, r4=1; and 0<β<γ<1.

[0032] S3, each set of stability control devices compares its own collected data and received data, and based on the operating status information of each collector line, adjusts the disconnection priority of each collector line online, and calculates the total disconnectable capacity of the new energy stability control execution station and sends it to the superior station. In the above technical solution, in step S3, determining the priority of disconnecting each collector line in the new energy power plant needs to be calculated comprehensively based on multi-dimensional monitoring data of operating flag position, real-time active power and predicted active power.

[0033] S3 specifically includes the following steps: S301. Based on the reliability indicators of the stability control device and the status flag bits of each collector wire, determine the collector wires that can be disconnected; specifically: The disconnection of the collector wire is permitted only if at least one set of stable control devices meets the reliability index e > e2. If only a single stability control device satisfies e>e2, then the cut-off determination is made based on the operating status of the collector wire collected by this stability control device. The cut-off of the collector wire is allowed only when both the cut-off permission flag and the operating flag are set to 1. If both stability control devices satisfy e>e2, then the cut-off of the collector wire is allowed only when both the cut-off permission flag and the operating flag are set to 1 in each stability control device.

[0034] S302. Calculate the combined power generation of each collector wire that is allowed to be disconnected, specifically:

[0035] in, For the first i The total power generation capacity of the collector wires that are allowed to be cut. For the first i The real-time active power factor of the collector wires that are allowed to be disconnected. For the first i The predicted active power factor of the collector wires that are allowed to be cut off; , The first i Real-time active power and predicted active power of the collector wires that are allowed to be cut.

[0036] Specifically, if only a single stability control device satisfies e > e2, then and Take the data collected by this set of stability control devices; if both sets of stability control devices satisfy e>e2, then and Take the smaller value of the data collected from the two sets of stabilization control devices.

[0037] Specifically, and The value of is determined as follows:

[0038]

[0039] in, For the first i The relative deviation between the predicted active power and the actual active power of the power distribution cable. For low deviation threshold, It is a high deviation threshold, and satisfies ; and The proportion of new energy output in the energy system can be determined. In this embodiment of the invention, The preferred value is 15%. The preferred value is 25%.

[0040] The stability control device collected the first i The relative deviation between the predicted and actual active power of the collector cable Specifically, it shall be determined in the following manner: Calculate the number of days in the past seven days. i The maximum percentage deviation between the predicted active power and the actual power at each time point of the collector line is taken as the relative deviation between the ultra-short-term predicted power and the actual power of that collector line.

[0041] S303. Based on the comprehensive power generation of each collector line, the disconnection priority of each collector line is adjusted online, specifically as follows: All collector lines are randomly numbered from 1 to m. For each collector line that is allowed to be disconnected, its disconnection priority is set from 1 to n in descending order of its comprehensive power generation capacity. The smaller the value, the higher the disconnection priority. If multiple collector lines have the same comprehensive power generation capacity, the random number of the collector line is used as the basis, and the collector line with the smaller number has a smaller disconnection priority. For the remaining collector lines that are not allowed to be disconnected, their disconnection priority is set to 0. Here, n is the total number of collector lines that are allowed to be disconnected, m is the total number of all collector lines in the new energy power station, and n <= m.

[0042] The priority of disconnecting each collector cable is refreshed as follows: If the operating status flags of all collector lines remain unchanged, they will be refreshed periodically at a fixed cycle; if the operating status flag of any collector line changes, it will be refreshed immediately.

[0043] S304. Calculate the total switchable capacity of the new energy stability control execution station and send it to the superior station. Specifically: The total cut-off capacity of the new energy stabilization and control execution station is the sum of the real-time active power of all the collectors that are allowed to be cut off at this station; The two sets of stabilization control devices calculate the total switchable capacity based on the operating status information collected by each device. If neither of the two stability control devices meets its own reliability index e>e2, the total switchable capacity sent up is 0; if only one of the two stability control devices does not meet its own reliability index e>e2, the total switchable capacity calculated by the other stability control device is sent to the superior station; if both stability control devices meet their own reliability index e>e2, and the relative deviation of the total switchable capacity calculated by the two stability control devices is no greater than 5%, the larger value of the total switchable capacity calculated by the two stability control devices is sent to the superior station; otherwise, the smaller value of the total switchable capacity calculated by the two stability control devices is sent to the superior station.

[0044] S4. When the new energy stability control execution station receives the required cut-off quantity from the superior station, it judges the undercut quantity in descending order of the cut-off priority of each collector line until the undercut quantity is not greater than the undercut setting value or the traversal of the cut-off collector lines is completed, and the stability control device outputs the action to cut off the corresponding collector line.

[0045] In the above technical solution, in step S4, the undercut amount P q Required cutting quantity P x The difference between the sum of the real-time active power of the selected cut-off collectors and the actual cut-off value. The undercut setting value refers to the acceptable undercut amount P. q The maximum value. The new energy stability control execution station receives the required cutoff quantity P from the superior station. x Then, first, the undercut amount P will be set. q =P x , will P q With the cut-off priority set to 1, the real-time active power P of the collector wire w,i Compare, if P q If the value is greater than the undercut setting, record the wire number of that set, and let P... q =P q -P w,i Then recalculate the obtained P q With the priority setting value of cutoff set to 2, the real-time active power P of the collector wire is... w,i The comparisons are repeated, and so on, until the latest calculated undercut P is obtained. q The calculation ends when the value is less than or equal to the undercut setting, or when all cuttable collectors have been traversed. After the calculation, the device output action cuts off all selected collectors.

[0046] In the above technical solution, step 4, the exit action includes opening the device, cutting the collector cable number, cutting capacity of each collector cable, total actual cutting capacity of the station, and action time.

[0047] This invention also claims protection for a multi-dimensional monitoring and control system for a new energy stability control execution station based on the aforementioned method, including a collector power line operation status information acquisition module, a dual-set stability control device data information interaction module, a new energy stability control execution station switchable capacity transmission module, and a stability control device output action module; The collector line operation status information acquisition module is equipped with two sets of stability control devices at the new energy stability control execution station. Each set of stability control devices collects the operation status information of all collector lines in the new energy power plant. The system includes a dual-set data information exchange module for stability control devices. Each stability control device assesses its own reliability in real time and determines its data exchange and output control strategies based on its own reliability. During the data exchange process, based on a mirror self-retrieval information exchange mechanism, the system publishes its data information point-to-point to the other stability control device and simultaneously subscribes to and receives data information from the other stability control device. The data information includes the operating status information of all collector lines in the new energy plant, the device fault flag bits of the stability control device, and the output status. The new energy stability control execution station's cut-off capacity transmission module compares its own collected data with the received data, and based on the operating status information of each collector line, adjusts the cut-off priority of each collector line online, and calculates the total cut-off capacity of the new energy stability control execution station to be transmitted to the superior station. When the new energy stability control execution station receives the required cut-off quantity from the superior station, the output action module of the stability control device judges the undercut quantity in descending order of the cut-off priority of each collector line until the undercut quantity is not greater than the undercut setting value or the cut-off element traversal is completed, and the output action of the stability control device cuts off the corresponding collector line.

[0048] Example 2: This embodiment provides a multi-dimensional monitoring and control method for a new energy stability control station, including the following steps: S1, Two sets of stability control devices are configured in the new energy stability control execution station. Each set of stability control devices collects the operating status information of all collector lines of the new energy plant. In step S1, the new energy power station includes wind farms and photovoltaic stations, and the operating status information of the collector lines includes the status flag bits of each collector line, single-phase voltage, single-phase current, and predicted active power P. w,y,i The status flags include "allowed," "operating," "out of service," and "under maintenance." The real-time active power P of each collector can be calculated from the operating status information of the collector lines. w,i Real-time reactive power P q,i The scalable capacity and the total scalable capacity of this site.

[0049] The allowable and maintenance status indicators are obtained by collecting the status of the soft and hard pressure plates. The operation and shutdown status indicators are derived by comparing and analyzing the collected collector voltage and current values ​​with preset judgment values. The collector voltage and current data can be directly collected using the device's AC plug-in, or the values ​​from the merging unit can be collected based on the 61850 protocol. The predicted active power of the collector is collected by the stability control device management board from the power prediction system server of the new energy plant.

[0050] S2, each stability control device judges its own reliability in real time, and based on the mirror self-retrieval information interaction mechanism, publishes the data information of this stability control device to another stability control device point-to-point, and subscribes to and receives the data information of another stability control device; the data information includes the operating status information of all collector lines of the new energy plant, the device fault flag bit of the stability control device, and the output status. The two sets of stable control devices communicate via Ethernet using the GOOSE communication protocol to transmit the electrical and switching quantities they have collected and calculated. Before sending data, each device must verify its own reliability; if the verification conditions are not met, a fault flag is sent to the other device. Since the information collected by the two devices is identical and mirrored, the amount of data exchanged can be selected via device panel buttons or auxiliary software tools. Before data exchange, the devices must determine their own reliability indicators.

[0051] The mirror self-retrieval mechanism refers to the characteristic of consistent resources between two sets of devices, publishing information points and subscribing to information points, and the point-to-point interaction between dedicated plug-ins and known mirrors. By configuring parameter tables and selecting interactive resources, virtual loops are automatically generated, realizing standard GOOSE protocol communication that simplifies the configuration process.

[0052] S3, each set of stability control devices compares its own collected data and received data, and based on the operating status information of each collector line, adjusts the disconnection priority of each collector line online, and calculates the total disconnectable capacity of the new energy stability control execution station and sends it to the superior station. S3 specifically includes: Based on the reliability index of the stability control device and the status flag bits of each collector line, determine the collector lines that can be disconnected; calculate the comprehensive power generation of each collector line that can be disconnected. All collector lines are randomly numbered from 1 to m. For each collector line that is allowed to be disconnected, its disconnection priority is set from 1 to n in descending order of its comprehensive power generation capacity. The smaller the value, the higher the disconnection priority. If multiple collector lines have the same comprehensive power generation capacity, the random number of the collector line is used as the basis, and the collector line with the smaller number has a smaller disconnection priority. For the remaining collector lines that are not allowed to be disconnected, their disconnection priority is set to 0. Here, n is the total number of collector lines that are allowed to be disconnected, m is the total number of all collector lines in the new energy power station, and n <= m.

[0053] S4. When the new energy stability control execution station receives the required cut-off quantity from the superior station, it judges the undercut quantity in descending order of the cut-off priority of each collector line until the undercut quantity is not greater than the undercut setting value or the traversal of the cut-off collector lines is completed, and the stability control device outputs the action to cut off the corresponding collector line.

[0054] In the above technical solution, in step S4, the undercut amount P q Required cutting quantity P x The difference between the sum of the real-time active power of the selected cut-off collectors and the actual cut-off value. The undercut setting value refers to the acceptable undercut amount P. q The maximum value. The new energy stability control execution station receives the required cutoff quantity P from the superior station. x Then, first, the undercut amount P will be set. q =P x , will P q With the cut-off priority set to 1, the real-time active power P of the collector wire w,i Compare, if P q If the value is greater than the undercut setting, record the wire number of that set, and let P... q =P q -P w,i Then recalculate the obtained P q With the priority setting value of cutoff set to 2, the real-time active power P of the collector wire is... w,i The comparisons are repeated, and so on, until the latest calculated undercut P is obtained. q The calculation ends when the value is less than or equal to the undercut setting, or when all cuttable collectors have been traversed. After the calculation, the device output action cuts off all selected collectors.

[0055] In the above technical solution, S4, the exit action includes the opening device, the cut-off collector number, the cut-off capacity of each collector, the total actual cut-off capacity of the station, and the action time.

[0056] A multi-dimensional monitoring and control method for renewable energy stability control stations is applied in the field of automatic control technology for power grid safety and stability. Furthermore, this method is applied to renewable energy stability control stations within regional stability control systems. The system architecture of the renewable energy stability control station is as follows: Figure 2 As shown, the regional stability control system comprises a main control station, substations, and execution stations. When the new energy stability control execution station is deployed in a wind farm or photovoltaic station, it is responsible for collecting the operating conditions of the collector lines in the new energy plant. When it receives a disconnection command from the superior station, it disconnects the collector lines. Substations collect information from the execution stations within their assigned area, summarize the information, and send it to the main control station. They also further distribute the disconnection commands issued by the main station to the execution stations. The main control station, based on the information sent by each substation, calculates and generates a tripping command based on the control strategy when a stability fault occurs in the system, and then sends it to the substations.

[0057] This disclosure can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of this disclosure.

[0058] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination of the foregoing. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0059] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0060] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A multi-dimensional monitoring and control method for a new energy stability control execution station, characterized in that, The method includes the following steps: S1, Two sets of stability control devices are configured in the new energy stability control execution station. Each set of stability control devices collects the operating status information of all collector lines of the new energy plant. S2, each stability control device assesses its own reliability in real time and determines data interaction and output control strategies based on its own reliability. During the data interaction process, based on the mirror self-retrieval information interaction mechanism, the data information of this stability control device is published point-to-point to another stability control device, while subscribing to and receiving data information from another stability control device. The data information includes the operating status information of all collector lines of the new energy plant, the device fault flag bit of the stability control device, and the output status. S3, each set of stability control devices compares its own collected data and received data, and based on the operating status information of each collector line, adjusts the disconnection priority of each collector line online, and calculates the total disconnectable capacity of the new energy stability control execution station and sends it to the superior station. S4. When the new energy stability control execution station receives the required cut-off quantity from the superior station, it judges the undercut quantity in descending order of the cut-off priority of each collector line until the undercut quantity is not greater than the undercut setting value or the traversal of the cut-off collector lines is completed, and the stability control device outputs the action to cut off the corresponding collector line.

2. The multi-dimensional monitoring and control method for new energy stability control execution stations according to claim 1, characterized in that, In S1, the operating status information of the collector lines includes the status flag bits, single-phase voltage, single-phase current, and predicted active power of each collector line; wherein, the status flag bits include cut-off, operation, shutdown, and maintenance, and the predicted active power is collected by the stability control device from the power prediction equipment in the new energy power plant; the real-time active power of each collector line can be calculated based on the operating status information of the collector lines.

3. The multi-dimensional monitoring and control method for the new energy stability control execution station according to claim 2, characterized in that, In S2, each stability control unit calculates its own reliability index e in real time to determine its data interaction and exit control strategies, specifically: Each stability control device calculates its own reliability index e in real time. When e < e1, the output of this stability control device is locked, and a device fault flag is sent to another stability control device. When e1 ≤ e < e2, the device fault flag is sent to another stability control device, and the output status of the other stability control device is copied. After a delay τ, the output of this stability control device is triggered. When e ≥ e2, the operating status information of all collector lines of the new energy power plant collected by this stability control device is sent to another stability control device in real time, and the output of this stability control device is triggered immediately according to the received tripping command. Here, τ is a preset delay setting, e1 is the first reliability index setting, e2 is the second reliability index setting, and 0 < e1 < e2 < 1. The larger the reliability index, the higher the reliability of the stability control device.

4. The multi-dimensional monitoring and control method for the new energy stability control execution station according to claim 3, characterized in that, The reliability index e is determined in the following manner: The system acquires five indicators: alarm information r1, device temperature r2, operating voltage r3, status flag acquisition value r4, and real-time active power acquisition value r5 of each collector. It assigns a corresponding evaluation coefficient to each indicator, and the sum of the evaluation coefficients of the five indicators is 1. The system then multiplies the value of each indicator by its corresponding evaluation coefficient and sums the results to obtain the reliability index e corresponding to each stability control device. Specifically, if the stability control device has a Type I alarm, the reliability index e=0; if the stability control device has a Type II alarm, then r1=α, where 0<α<1; if the stability control device has no alarm, then r1=1; the impact of Type I alarms is greater than that of Type II alarms; the number of collectors with abnormal state combinations collected by the stability control device is counted, and the proportion of these to the total number of collectors is calculated as k; the abnormal state combinations include: a single collector's status flag bit containing both operation and shutdown, a single collector's status flag bit containing both operation and maintenance, and a single collector's status flag bit containing both operation, shutdown, and maintenance; when k≥10%, e=0; when 5%≤k<10%, r4=β; when 1%≤k<5%, r4=γ; when k<1%, r4=1; and 0<β<γ<1.

5. The multi-dimensional monitoring and control method for the new energy stability control execution station according to claim 4, characterized in that, S3 specifically includes: Based on the reliability index of the stability control device and the status flag bits of each collector line, determine the collector lines that can be disconnected; calculate the comprehensive power generation of each collector line that can be disconnected. All collector lines are randomly numbered from 1 to m. For each collector line that is allowed to be disconnected, its disconnection priority is set from 1 to n in descending order of its comprehensive power generation capacity. The smaller the value, the higher the disconnection priority. If multiple collector lines have the same comprehensive power generation capacity, the random number of the collector line is used as the basis, and the collector line with the smaller number has a smaller disconnection priority. For the remaining collector lines that are not allowed to be disconnected, their disconnection priority is set to 0. Here, n is the total number of collector lines that are allowed to be disconnected, m is the total number of all collector lines in the new energy power station, and n <= m.

6. The multi-dimensional monitoring and control method for the new energy stability control execution station according to claim 5, characterized in that, The method for determining the permissible cut-off collectors based on the reliability index of the stability control device and the status flag bits of each collector is as follows: The operation of disconnecting the collector wire is only permitted when at least one set of stable control devices meets the reliability index e > e2. If only a single stability control device satisfies e>e2, then the cut-off determination is made based on the operating status of the collector wire collected by this stability control device. The cut-off of the collector wire is allowed only when both the cut-off permission flag and the operating flag are set to 1. If both stability control devices satisfy e>e2, then the cut-off of the collector wire is allowed only when both the cut-off permission flag and the operating flag are set to 1 in each stability control device.

7. The multi-dimensional monitoring and control method for the new energy stability control execution station according to claim 5, characterized in that, The combined power generation capacity of each collector wire that is allowed to be disconnected is determined as follows: in, For the first i The total power generation capacity of the collector wires that are allowed to be cut. For the first i The real-time active power factor of the collector wires that are allowed to be disconnected. For the first i The predicted active power factor of the collector wires that are allowed to be cut off; , The first i Real-time active power and predicted active power of the collector wires that are allowed to be disconnected; If only a single stability control device meets its own reliability index e>e2, then and Take the data collected by this set of stability control devices; if both sets of stability control devices meet their own reliability index e>e2, then and Take the smaller value of the data collected from the two sets of stabilization control devices.

8. The multi-dimensional monitoring and control method for the new energy stability control execution station according to claim 7, characterized in that, No. i Real-time active power factor of the collector wires that are allowed to be disconnected and predicted active power coefficient It shall be determined in the following manner: in, For the first i The relative deviation between the predicted active power and the actual active power of the power distribution cable. For low deviation threshold, It is a high deviation threshold, and satisfies ; and It can be determined based on the proportion of new energy output in the energy system.

9. The multi-dimensional monitoring and control method for the new energy stability control execution station according to claim 5, characterized in that, In S3, the calculation of the total switchable capacity of the new energy stability control execution station and its transmission to the upper-level station specifically includes: The sum of the real-time active power of all allowed disconnected collectors in the new energy stabilization and control execution station is calculated as the total disconnectable capacity of the new energy stabilization and control execution station; The two sets of stabilization control devices calculate the total switchable capacity based on the operating status information collected by each device. If neither of the two stability control devices meets its own reliability index e>e2, the total switchable capacity sent up is 0; if only one of the two stability control devices does not meet its own reliability index e>e2, the total switchable capacity calculated by the other stability control device is sent to the superior station; if both stability control devices meet their own reliability index e>e2, and the relative deviation of the total switchable capacity calculated by the two stability control devices is no greater than 5%, the larger value of the total switchable capacity calculated by the two stability control devices is sent to the superior station; otherwise, the smaller value of the total switchable capacity calculated by the two stability control devices is sent to the superior station.

10. A multi-dimensional monitoring and control system for a new energy stability control execution station based on the method of any one of claims 1-9, comprising a current line operation status information acquisition module, a dual-set stability control device data information interaction module, a new energy stability control execution station switchable capacity transmission module, and a stability control device output action module, characterized in that: The collector line operation status information acquisition module is equipped with two sets of stability control devices at the new energy stability control execution station. Each set of stability control devices collects the operation status information of all collector lines in the new energy power plant. The system includes a dual-set data information exchange module for stability control devices. Each stability control device assesses its own reliability in real time and determines its data exchange and output control strategies based on its own reliability. During the data exchange process, based on a mirror self-retrieval information exchange mechanism, the system publishes its data information point-to-point to the other stability control device and simultaneously subscribes to and receives data information from the other stability control device. The data information includes the operating status information of all collector lines in the new energy plant, the device fault flag bits of the stability control device, and the output status. The new energy stability control execution station's cut-off capacity transmission module compares its own collected data with the received data, and based on the operating status information of each collector line, adjusts the cut-off priority of each collector line online, and calculates the total cut-off capacity of the new energy stability control execution station to be transmitted to the superior station. When the new energy stability control execution station receives the required cut-off quantity from the superior station, the output action module of the stability control device judges the undercut quantity in descending order of the cut-off priority of each collector line until the undercut quantity is not greater than the undercut setting value or the cut-off element traversal is completed, and the output action of the stability control device cuts off the corresponding collector line.

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