Monitoring system of low-frequency load shedding device

Abstract

The invention relates to a monitoring system of a low-frequency load shedding device, which is applied to the field of power supply or power distribution, and comprises a device body, an execution mechanism arranged in the device body, a DSP (Digital Signal Processor) operation processing unit carried in the device body and double sets of redundant links connected with the device body, by adopting the arrangement of double sets of redundant link data acquisition units, a scheduling regulation feedback unit, a reserved re-verification unit, a prediction scheduling emergency unit and a load regulation emergency recovery unit, the fusion of multi-source information can be promoted in the application process of the monitoring system, on one hand, the intermittency and volatility of new energy are predicted and applied, and on the other hand, the integration of the multi-source information is facilitated; on the other hand, data can be re-verified after load regulation and control, data errors caused by previous-stage actions are reduced, false actions of the device body are reduced, effectiveness and safety of load cutting of the device body are guaranteed, and monitoring accuracy and stability of the monitoring system on power grid frequency data are effectively improved; and the phenomenon of mistaken cutting or missing cutting is avoided.

Description

Technical Field

[0001] The present invention relates to a monitoring system, and in particular to a monitoring system for a low-frequency load reduction device applied to the field of power supply or power distribution. Background Art

[0002] The underfrequency load shedding device is a protective measure designed to automatically or manually remove some non-core loads in response to a drop in frequency caused by an active power shortage in the power system. The device can respond quickly and prevent the frequency from continuing to decline, thereby avoiding a frequency collapse in the system. The monitoring system of the underfrequency load shedding device plays a vital role in ensuring that the power system can respond in time and implement load shedding when facing an active power shortage.

[0003] The monitoring system usually consists of key parts such as data acquisition unit, communication network, monitoring center and actuator. The data acquisition unit is responsible for collecting key parameters such as frequency and load of the power grid in real time; the communication network transmits these data to the monitoring center; the monitoring center processes, analyzes and judges these data, and then issues control instructions according to the preset logic; finally, after receiving the instructions, the actuator is responsible for actually executing the load shedding operation.

[0004] However, with the large-scale distributed renewable energy access to the power grid, new security challenges have been brought to the power system. The power output of renewable energy is affected by changes in environmental factors and has obvious intermittent and volatile characteristics. This characteristic makes the changes in grid frequency more diverse, making it difficult for the monitoring system to effectively predict and adapt to this volatility. Therefore, how to strengthen the monitoring system's ability to predict and control renewable energy power, ensure the accuracy and stability of its monitoring of grid frequency data, and avoid mis-cutting or missed cutting has become an important issue that needs to be solved in the current low-frequency load shedding device monitoring system. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is how to strengthen the monitoring system's prediction and control capabilities for renewable energy power, ensure the accuracy and stability of its monitoring of grid frequency data, and avoid mis-cutting or missed cutting.

[0006] In order to solve the above problems, the present invention provides a monitoring system for a low-frequency load shedding device, comprising a device body, an actuator arranged in the device body, a DSP operation processing unit carried in the device body, and a double set of redundant links connected to the device body, wherein the input end of the DSP operation processing unit is connected to a double set of redundant link data acquisition unit, a dispatching and control feedback unit, a power grid parameter acquisition unit, a full meteorological data acquisition unit, and a reserved re-verification unit; The output end of the DSP operation processing unit is connected to the load dispatching and control unit, the trend prediction unit and the load control emergency recovery unit. The output end of the trend prediction unit is connected to the forecasting and dispatching emergency unit. The input ends of the reserved re-verification unit and the dispatching and control feedback unit are both connected to the dual sets of redundant link data acquisition unit signals. The actuator includes an actuator stator fixedly arranged inside the actuator and a main actuator plate rotatably arranged inside the actuator, and the main actuator plate cooperates with the actuator stator, and a compensation conversion mechanism is fixedly arranged at the lower end of the actuator stator, and a secondary actuator plate respectively cooperating with the main actuator plate and the actuator stator is fixedly connected to the lower end of the compensation conversion mechanism; The input end of the dual redundant link data acquisition unit is connected to the dual redundant link signal, the input end of the power grid parameter acquisition unit and the full meteorological data acquisition unit are both connected to the monitoring center signal, the output end of the load dispatching and control unit is connected to the actuator signal, the output end of the prediction and dispatching emergency unit is respectively connected to the DSP operation processing unit and the load dispatching and control unit signal, and the output end of the load control emergency recovery unit is connected to the compensation conversion mechanism signal.

[0007] In the monitoring system of the above-mentioned low-frequency load reduction device, it is possible to promote the integration of multi-source information during the application of this monitoring system. On the one hand, it can predict and apply the intermittent and volatility of new energy sources. On the other hand, it can re-verify the data after load regulation, effectively improving the monitoring accuracy and stability of the power grid frequency data and avoiding mis-cutting or missed cutting.

[0008] As a supplement to the present application, the compensation conversion mechanism includes an elastic sleeve fixedly connected to the lower end of the actuator plate, the lower end of the elastic sleeve is fixedly connected to a secondary actuator plate, the upper end of the secondary actuator plate is fixedly connected to a plurality of connecting wires, the lower ends of the connecting wires pass through the elastic sleeve and are fixedly connected to the actuator plate, the upper and lower inner walls of the elastic sleeve are fixedly connected to an electromagnetic control block, and the output end of the load control emergency recovery unit is connected to the electromagnetic control block signal.

[0009] As a supplement to the present application, the device body is connected to the dual redundant links and the monitoring center signal through the remote motor communication channel, and the remote motor communication channel adopts the IEC104 protocol.

[0010] As a supplement to the present application, the output end of the DSP operation processing unit is also connected to a data display unit, and the output end of the data display unit is connected to a display and a display lamp bead signal arranged at the left end of the device body.

[0011] As a further improvement of the present application, the electromagnetic control blocks at the upper and lower corresponding positions are fixedly connected to an elastic trigger bar at one end thereof, and the input end of the DSP operation processing unit is also connected to a compensation mechanism state feedback unit, and the input end of the compensation mechanism state feedback unit is connected to the elastic trigger bar signal.

[0012] As a further improvement of the present application, the input end of the DSP operation processing unit is also connected to a closing data acquisition unit, and the input end of the closing data acquisition unit is connected to the actuator signal arranged in the device body.

[0013] As a further improvement of the present application, the DSP operation processing unit includes a data acquisition receiving module and a verification data receiving module, the input end of the data acquisition receiving module is respectively connected to the dual redundant link data acquisition unit, the power grid parameter acquisition unit, the full meteorological data acquisition unit and the closing data acquisition unit signal, and the output end of the data acquisition receiving module is connected to the data rough processing module; The input end of the verification data receiving module is respectively connected to the reserved re-verification unit, the dispatching control feedback unit and the prediction dispatching emergency unit signal, and the output end of the verification data receiving module is connected to the verification data processing module; The output ends of the data rough processing module and the verification data processing module are both connected to the comprehensive optimization processing module signal, the output end of the comprehensive optimization processing module is connected to the optimization scheduling instruction transmission module, the output end of the data rough processing module is also connected to the optimization scheduling instruction transmission module signal, and the instruction priority of the data rough processing module is lower than the instruction priority of the comprehensive optimization processing module; The output end of the optimized dispatching instruction transmission module is respectively connected with the load dispatching and controlling unit, the load controlling emergency recovery unit and the trend prediction unit signal.

[0014] As another improvement of the present application, the reserved re-verification unit includes a link comprehensive judgment module and a quality comprehensive judgment module, the output ends of the link comprehensive judgment module and the quality comprehensive judgment module are connected to the reserved verification processing module, and the output end of the reserved verification processing module is connected to the access data output module and the abnormal data output module; The input end of the link comprehensive judgment module is connected to the link investment and withdrawal status collection module and the link terminal status collection module. The input ends of the link investment and withdrawal status collection module, the link final status collection module and the quality comprehensive judgment module are all connected to the dual sets of redundant link data collection unit signals, and the output ends of the access data output module and the abnormal data output module are all connected to the DSP operation processing unit signal.

[0015] As another improved supplement of the present application, the dual redundant links include an A set of links and a B set of links respectively connected to the device body signal, and the link launch and retreat status collection module collects the launch and retreat status data of the dual redundant links through the dual redundant link data collection unit, and the launch and retreat status data includes the launch and retreat data of the A set of links, the launch and retreat data of the B set of links, and the common launch and retreat data of the A set of links and the B set of links; The link terminal status acquisition module collects the interruption status data of the dual redundant links through the dual redundant link data acquisition unit. The interruption status data includes the interruption data of the A set link, the interruption data of the B set link, and the common interruption data of the A set link and the B set link; The quality comprehensive judgment module collects and judges the data quality of the dual redundant links through the dual redundant link data collection units. The data quality includes the data quality of link set A and the data quality of link set B, and then assists the reserved verification processing module to judge the effectiveness of the data quality transmitted by the link comprehensive judgment module.

[0016] In summary, through the setting of dual sets of redundant link data acquisition units, dispatching and control feedback units, reserved re-verification units, predictive dispatching emergency units and load control emergency recovery units, it is possible to promote the integration of multi-source information during the application of this monitoring system. On the one hand, it can predict and apply the intermittent and volatility of new energy, and can timely and effectively cut off enough composites to stabilize the power grid when new energy processing decreases, thereby promoting the protection of the power grid. On the other hand, it can re-verify the data after load regulation, reduce the data error caused by the previous level of action, reduce the false operation of the device itself, ensure the effectiveness and safety of the load shedding of the device itself, and effectively improve the monitoring accuracy and stability of the power grid frequency data of this monitoring system to avoid false cutting or missed cutting. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an operation logic diagram of the monitoring system of the first to third embodiments of the present application; Figure 2 This is an axonometric view of the device body of the first to third embodiments of the present application; Figure 3 This is a front view of the interior of the device body of the first to third embodiments of the present application; Figure 4 It is a partial cross-sectional view of the actuator of the first embodiment of the present application in the load shedding state; Figure 5 For the first implementation of this application Figure 4 A partial enlarged view of the middle part; Figure 6 It is a partial enlarged view of the actuator of the first embodiment of the present application when the compensation conversion mechanism and the load control emergency recovery unit are in effect in the load shedding state; Figure 7 It is a partial cross-sectional view of the actuator of the first embodiment of the present application in the closed state; Figure 8 For the first implementation of this application Figure 7 A partial enlarged view of point B in the middle; Fig. 9It is a partial enlarged view of the actuator of the first embodiment of the present application when the compensation conversion mechanism and the load control emergency recovery unit are in effect in the closed state; Fig.10 This is an operation logic diagram of the monitoring system of the second embodiment of the present application; Fig.11 This is an operation logic diagram of the monitoring system of the third embodiment of the present application; Fig.12 This is a logic diagram for running the reserved re-verification unit of the third embodiment of the present application when pre-processing the collected data.

[0018] Description of the numbers in the figure: 1 device body, 11 dispatching cavity, 2 actuator, 21 main actuator moving piece, 22 actuator fixed piece, 3 compensation conversion mechanism, 31 elastic sleeve, 32 electromagnetic control block, 33 elastic trigger strip, 4 secondary actuator moving piece, 41 connecting wire. DETAILED DESCRIPTION

[0019] The following is a detailed description of three implementation methods of the present application in conjunction with the accompanying drawings.

[0020] The first implementation method: Figure 1 - Fig. 9 The monitoring system of the low-frequency load shedding device is shown, including a device body 1, an actuator 2 arranged in the device body 1, a DSP operation processing unit carried in the device body 1 and a double set of redundant links connected to the device body 1, a dispatching cavity 11 is opened in the device body 1, a plurality of actuators 2 are fixedly installed in the dispatching cavity 11, and the plurality of actuators 2 are respectively connected to the corresponding loads, new energy lines and backup power supplies, and the input end of the DSP operation processing unit is connected to a double set of redundant link data acquisition unit, a dispatching control feedback unit, a power grid parameter acquisition unit, a full meteorological data acquisition unit and a reserved re-verification unit; The output end of the DSP operation processing unit is connected to the load dispatching and control unit, the trend prediction unit and the load control emergency recovery unit. The output end of the trend prediction unit is connected to the forecasting and dispatching emergency unit. The input ends of the reserved re-verification unit and the dispatching and control feedback unit are both connected to the dual sets of redundant link data acquisition unit signals. The actuator 2 includes an actuator stator 22 fixedly arranged therein and a main actuator plate 21 rotatably arranged therein, and the main actuator plate 21 cooperates with the actuator stator 22, and a compensation conversion mechanism 3 is fixedly arranged at the lower end of the actuator stator 22, and a secondary actuator plate 4 respectively cooperating with the main actuator plate 21 and the actuator stator 22 is fixedly connected to the lower end of the compensation conversion mechanism 3; The input end of the dual redundant link data acquisition unit is connected to the dual redundant link signal, the input end of the power grid parameter acquisition unit and the full meteorological data acquisition unit are both connected to the monitoring center signal, the output end of the load dispatching and control unit is connected to the actuator 2 signal, the output end of the prediction and dispatching emergency unit is respectively connected to the DSP operation processing unit and the load dispatching and control unit signal, and the output end of the load control emergency recovery unit is connected to the compensation conversion mechanism 3 signal. Through the setting of the dual redundant link data acquisition unit, the dispatching and control feedback unit, the reserved re-verification unit, the prediction and dispatching emergency unit and the load control emergency recovery unit, it is possible to promote the fusion of multi-source information in the application of this monitoring system. On the one hand, it is possible to predict and apply the intermittent and volatility of new energy, and to be able to timely and effectively cut off enough composites to stabilize the power grid when the new energy processing decreases, and promote the protection of the power grid. On the other hand, it is possible to re-verify the data after load regulation, reduce the data error caused by the previous level of action, reduce the malfunction of the device body 1, ensure the effectiveness and safety of the load shedding of the device body 1, and effectively improve the monitoring accuracy and stability of the power grid frequency data of this monitoring system, and avoid erroneous or missed cutting.

[0021] Figure 1 - Fig. 9 It is shown that the device body 1 is connected to the dual redundant links and the monitoring center signal through the remote motor communication channel. The remote motor communication channel adopts the IEC104 protocol. The establishment of the device body 1 and the remote motor communication channel can directly upload the key information such as the equipment operation status, various AC electrical quantities, required load shedding, actual load shedding, pressure plate status, etc. to the monitoring system through the remote motor communication channel, eliminating the construction of the security substation and realizing the observability and measurability of the three lines of defense in a relatively simple way. In addition, the setting of the dual redundant links and the remote motor communication channel can also save construction costs and reduce on-site construction volume on the basis of maximizing the sampling reliability.

[0022] The IEC104 protocol is a standard for transmitting the IEC101 Application Service Data Unit (ASDU) using the network protocol TCP / IP. This standard provides the communication protocol basis for the network transmission of telecontrol information.

[0023] By combining the ASDU of protocol 104 with protocol 101, the standardization of the protocol and the reliability of communication can be well guaranteed. The overall structure of the protocol is shown in Table 1 below.

[0024] Table 1 IEC104 protocol frame format In addition to being used for information transmission between the device body (1) and the dual redundant links and monitoring center, the IEC104 protocol is also widely used for information interaction between various devices in the station, such as AGC / AVC, power prediction, primary frequency modulation, energy storage EMS, etc. The delay of communication within the station can be controlled at the second level, and it has a complete data invalidation judgment mechanism and high reliability.

[0025] Figure 1 - Figure 3 It is shown that the output end of the DSP operation processing unit is also connected to a data display unit, and the output end of the data display unit is connected to the display and display lamp signal arranged at the left end of the device body 1. The setting of the data display unit can effectively promote the synergy between the monitoring system and the maintenance personnel, reduce the difficulty of maintenance, and promote the safety of power grid operation.

[0026] Figure 4 - Fig. 9 The compensation conversion mechanism 3 is shown to include an elastic sleeve 31 fixedly connected to the lower end of the execution stator 22, the lower end of the elastic sleeve 31 is fixedly connected to a secondary execution stator 4, the upper end of the secondary execution stator 4 is fixedly connected to a plurality of connecting wires 41, the lower ends of the connecting wires 41 pass through the elastic sleeve 31, and are fixedly connected to the execution stator 22, the upper and lower inner walls of the elastic sleeve 31 are fixedly connected to an electromagnetic control block 32, the output end of the load control emergency recovery unit is signal-connected to the electromagnetic control block 32, the arrangement of the electromagnetic control block 32 and the load control emergency recovery unit can timely control the load state when a load control error occurs, thereby reducing the economic losses caused by the error and the damage to various equipment in the power grid, effectively ensuring the monitoring and control accuracy, data verification validity, emergency timeliness and fluctuation applicability of the monitoring system, promoting the functionality of the device body 1, so that it can be effectively applied to the protection role of the current new energy being incorporated into the power grid, and ensuring the stability and safety of the power grid.

[0027] Figure 4 - Fig. 9 It is shown that the electromagnetic control blocks 32 at the upper and lower corresponding positions are fixedly connected to one end thereof with an elastic trigger strip 33, and the input end of the DSP operation processing unit is also connected to a compensation mechanism state feedback unit, and the input end of the compensation mechanism state feedback unit is connected to the elastic trigger strip 33 signal. The setting of the compensation mechanism state feedback unit can further promote the effectiveness of the control of the monitoring system, and can perform data verification on the compensation conversion mechanism 3 itself when generating an emergency control effect on the load, to ensure the effectiveness of emergency recovery and the accuracy of direction.

[0028] Figure 1 - Fig. 9It is shown that during the operation of the device body 1, the DSP operation processing unit in the monitoring system can obtain the power grid parameters issued by the monitoring center through the power grid parameter acquisition unit, including but not limited to substation data, data on the new energy incorporated, and load data, etc., and can also collect meteorological data of the area where the new energy is located through the cooperation of the all-weather data acquisition unit and the monitoring center, which can effectively facilitate the DSP operation processing unit to judge the frequency of the power grid and the subsequent load shedding selection; At the same time, the dual redundant link data acquisition unit collects data from the dual redundant links and transmits them to the DSP operation processing unit, the reserved re-verification unit and the scheduling and control feedback unit respectively. After receiving the dual sets of data, the DSP operation processing unit pre-processes the data of the link at this time. The reserved re-verification unit re-verifies the received dual sets of data to determine the validity and accuracy of the data, and then transmits the verified data to the DSP operation processing unit. The DSP operation processing unit removes and selects the pre-processed data according to the verification data. The scheduling and control feedback unit retrieves and feeds back the relevant data generated by the previous level of control action, and then feeds back the data to the DSP operation processing unit, so that the DSP operation processing unit judges the current data. After receiving the previous level of instruction feedback data, the DSP operation processing unit performs data spacing on the data to avoid the erroneous triggering of the next level of control action due to the fact that the active power in the power grid may no longer be insufficient after the previous level of control action is executed and the frequency begins to rise, resulting in unnecessary load shedding action; Then, according to the collected power grid frequency data, data display is sent to the data display unit, so that the data display unit displays data through the display and display lamp beads, and a load control instruction is sent to the load control and dispatching unit, so that the load control unit controls the actuator 2 to produce action and select and cut the load, so as to ensure the stability of the power grid. At the same time, the full monitored data is transmitted to the trend prediction unit, which can process and judge the monitoring data, and then predict the load state according to the time period and predict the fluctuation of new energy according to the meteorological data, and transmit the predicted data to the prediction and dispatching emergency unit. After receiving the trend prediction data, the prediction and dispatching emergency unit will respond to the abnormal fluctuation. The data is processed, and then the predictive control data is transmitted to the DSP operation processing unit and the load control and dispatching unit respectively. The DSP operation processing unit processes and judges the predictive data, and the load dispatching and control unit stores the predictive standby control data. After the DSP operation processing unit verifies the predictive data through subsequent collected data, it directly transmits the predictive standby control instruction to the load dispatching and control unit, so that the load dispatching and control unit can generate control actions on the actuator 2 according to the predictive standby control data, effectively promoting the speed and accuracy of load shedding control in the subsequent grid frequency fluctuation process, improving the applicability of the monitoring system to the integration of new energy into the grid, and ensuring the protection effectiveness of the device body 1.

[0029] In the process that the DSP operation processing unit controls the actuator 2 through the load dispatching and control unit according to the collected data, the DSP operation processing unit can effectively judge the deformation state of the compensation conversion mechanism 3 at this time through the data of whether the elastic trigger strip 33 is triggered by the compensation mechanism state feedback unit, so as to ensure that the elastic sleeve 31 maintains the stability of its shape, and when the data collected by the subsequent DSP operation processing unit continues to show abnormal load shedding or abnormal load closing or when the output of new energy suddenly drops or rises, the DSP operation processing unit will transmit the emergency control data to the load control emergency recovery unit, so that the load control emergency recovery unit issues a control instruction to the electromagnetic control block 32; When the actuator 2 has a closing abnormality or needs to produce a closing action control, the load control emergency recovery unit controls the upper and lower electromagnetic control blocks 32 to produce a repulsive electromagnetic effect. Under the action of the electromagnetic repulsion, the elastic sleeve 31 produces elastic elongation deformation, thereby driving the secondary actuator piece 4 to move downward, actively resisting the main actuator piece 21, and through the conduction effect of the secondary actuator piece 4 and the connecting wire 41, the main actuator piece 21 and the actuator fixed piece 22 are connected to complete the compensation control effect of the closing action of the actuator 2, which can effectively deal with the closing abnormality of the actuator 2 and promote the effectiveness of the load control unit control, or can directly execute the actuator 2 to produce a closing action, while keeping the load control instruction of the DSP operation processing unit unchanged, avoiding the feedback abnormality of the subsequent data control, and can promote the timeliness and applicability of the monitoring system to the power grid frequency fluctuation caused by the sudden increase of the new energy output through emergency closing. When the actuator 2 has a load shedding abnormality or needs to perform a load shedding action regulation, the load regulation emergency recovery unit controls the upper and lower electromagnetic control blocks 32 to produce an electromagnetic effect of mutual attraction. Under the action of the electromagnetic suction force, the elastic sleeve 31 produces an elastic contraction deformation, thereby driving the secondary actuator plate 4 to move upward, actively away from the main actuator plate 21, and no longer in contact with the main actuator plate 21, so as to achieve the separation and non-conduction of the main actuator plate 21 and the actuator fixed plate 22, and complete the compensation regulation of the load shedding action of the actuator 2, which can effectively deal with the load shedding abnormality of the actuator 2, thereby improving the effectiveness and accuracy of the load shedding regulation of the DSP operation processing unit, promoting the stability of the power grid, or directly executing the load shedding action of the actuator 2, while keeping the load regulation instruction of the DSP operation processing unit unchanged, avoiding the feedback abnormality of the subsequent data regulation, and promoting the timeliness and applicability of the monitoring system to the frequency fluctuation of the power grid caused by the sudden decrease of the output of new energy through emergency matching; And in the process of elastic elongation deformation of the elastic sleeve 31, the upper and lower corresponding elastic trigger strips 33 move away from each other, causing the DSP operation processing unit to receive data that the elastic trigger strip 33 is not triggered through the compensation mechanism state feedback unit. In the process of elastic contraction deformation of the elastic sleeve 31, the upper and lower corresponding elastic trigger strips 33 move closer to each other and continue to maintain their abutment. The DSP operation processing unit receives the continuous triggering data of the elastic trigger strip 33 through the compensation mechanism state feedback unit, and then in the subsequent load control process, the DSP operation processing unit can generate effective control instructions to the load dispatching and control unit and the load control emergency recovery unit according to the state of the compensation conversion mechanism 3 at this time, so as to ensure the effectiveness and accuracy of load control, and further ensure the accuracy and effectiveness of the device body 1 and the monitoring system in load control according to the power grid frequency fluctuation, and effectively stabilize the power grid.

[0030] Second implementation method: Figure 1 - Figure 3 and Fig.10 The monitoring system of the low-frequency load shedding device is shown. The input end of the DSP operation processing unit is also connected to a closing data acquisition unit. The input end of the closing data acquisition unit is connected to the signal of the actuator 2 arranged in the device body 1. The setting of the closing data acquisition unit can further increase the diversity of the data collected by the monitoring system, and monitor the load status data in the power grid in real time to ensure the effectiveness and accuracy of subsequent load shedding or closing regulation.

[0031] Fig.10 The DSP operation processing unit includes a data acquisition receiving module and a verification data receiving module. The input end of the data acquisition receiving module is respectively connected to the dual redundant link data acquisition unit, the power grid parameter acquisition unit, the full meteorological data acquisition unit and the closing data acquisition unit signal. The output end of the data acquisition receiving module is connected to the data rough processing module. The input end of the verification data receiving module is respectively connected to the reserved re-verification unit, the dispatching control feedback unit and the prediction dispatching emergency unit signal, and the output end of the verification data receiving module is connected to the verification data processing module; The output ends of the data rough processing module and the verification data processing module are both connected to the comprehensive optimization processing module signal. The comprehensive optimization processing module adopts the most optimal cutting algorithm. The output end of the comprehensive optimization processing module is connected to the optimization scheduling instruction transmission module. The output end of the data rough processing module is also connected to the optimization scheduling instruction transmission module signal, and the instruction priority of the data rough processing module is lower than the instruction priority of the comprehensive optimization processing module. The output end of the optimized dispatching instruction transmission module is respectively connected to the load dispatching and control unit, the load control emergency recovery unit and the trend prediction unit. The dual processor method is used to classify the collected data and feedback data, and then the corresponding data is processed by the data rough processing module and the verification data processing module. The processed data is then optimized by the comprehensive optimization processing module. The load level can be calculated in real time to obtain the required cutting amount for each round. Under the premise of ensuring over-cutting, the load loss can be reduced. It can not only effectively improve the computing speed of the DSP computing processing unit and promote its effectiveness in protecting the stability of the power grid, but also ensure the accuracy of load cutting.

[0032] Figure 1 - Figure 3 and Fig.10During the operation of the monitoring system, the data acquisition receiving module in the DSP operation processing unit collects and processes the data transmitted by the power grid parameter acquisition unit, the full meteorological data acquisition unit, the closing data acquisition unit and the dual redundant link data acquisition unit, and then transmits it to the data rough processing module, so that the data rough processing module generates rough processing execution data for load control of the power grid frequency fluctuation according to the collected data, and transmits the data to the comprehensive optimization processing module and the optimization scheduling instruction transmission module respectively; The verification data receiving module will also collect and process the data transmitted by the dispatching and control feedback unit, the reserved re-verification unit, the forecast dispatching emergency unit and the compensation mechanism state feedback unit, and then transmit these verification data to the verification data processing module, so that the verification data processing module retrieves and selects these data to form verification execution data, and then transmits them to the comprehensive optimization processing module; The comprehensive optimization processing module optimizes and selects the rough processing execution data according to the verified execution data, and then transmits the optimized execution data to the optimization control instruction transmission module. When the optimization control instruction transmission module receives the execution data transmitted by the data rough processing module and the comprehensive optimization processing module at the same level, it transmits the optimized execution data transmitted by the comprehensive optimization processing module. When only the data transmitted by the data rough processing module is received, the control data is transmitted according to the rough processing execution data. While effectively ensuring the accuracy, optimality and effectiveness of load selection and shedding control, it can also perform rough control of the load according to the execution data of the data rough processing module in time when the comprehensive optimization processing module is stuck, reduce the volatility of the power grid frequency, reduce the fluctuation of the power grid frequency, and then wait for the processing time of the comprehensive optimization processing module to maintain the continuity and effectiveness of the power grid stability control and reduce the power grid damage.

[0033] In addition, the closing data acquisition module will transmit the closing status and load shedding status data of the actuator 2 to the data acquisition receiving module, and then prompt the data rough processing module to perform subsequent regulation and maintenance on the actuator 2 according to the status data of the actuator 2 in the previous level instruction and the changes in the monitoring data. On the one hand, it ensures the effectiveness and optimality of the data execution of the load scheduling and control unit, and can also effectively prevent the erroneous operation of the load shedding control due to the influence of the data of the previous level instruction, thereby ensuring the effectiveness and accuracy of the subsequent load shedding or closing control.

[0034] The third implementation method: Figure 1 - Figure 3 , Fig.11 and Fig.12The monitoring system of the low-frequency load shedding device is shown, the reserved re-verification unit includes a link comprehensive judgment module and a quality comprehensive judgment module, the output ends of the link comprehensive judgment module and the quality comprehensive judgment module are connected to the reserved verification processing module, and the output end of the reserved verification processing module is connected to the access data output module and the abnormal data output module; The input end of the link comprehensive judgment module is connected to the link investment and withdrawal status acquisition module and the link terminal status acquisition module. The input ends of the link investment and withdrawal status acquisition module, the link final status acquisition module and the quality comprehensive judgment module are all connected to the dual sets of redundant link data acquisition unit signals. The output ends of the access data output module and the abnormal data output module are all connected to the DSP operation processing unit signal. The setting of the link comprehensive judgment module and the quality comprehensive judgment module can promote the selection of quality data collection and transmission and improve the accuracy and effectiveness of the collected data. At the same time, it can assist the DSP operation processing unit in the link investment and withdrawal status and interruption status, comprehensively judge and select the load shedding plan, improve the accuracy and optimality of load regulation, and effectively ensure the safety and stability of the power grid.

[0035] Fig.11 and Fig.12 It is shown that the dual redundant links include an A set of links and a B set of links respectively connected to the device body 1 by signals, and the A set of links and the B set of links are arranged in parallel with the device body 1, and the link launch and retreat status acquisition module collects the launch and retreat status data of the dual redundant links through the dual redundant link data acquisition unit, and the launch and retreat status data includes the launch and retreat data of the A set of links, the launch and retreat data of the B set of links, and the common launch and retreat data of the A set of links and the B set of links; The link terminal status acquisition module collects the interruption status data of the dual redundant links through the dual redundant link data acquisition unit. The interruption status data includes the interruption data of the A set link, the interruption data of the B set link, and the common interruption data of the A set link and the B set link; The quality comprehensive judgment module collects and judges the data quality of the dual redundant links through the dual redundant link data collection units. The data quality includes the data quality of link set A and the data quality of link set B, and then assists the reserved verification processing module to judge the effectiveness of the data quality transmitted by the link comprehensive judgment module. The link investment and withdrawal status collection module, the link terminal status collection module and the quality comprehensive judgment module can effectively collect various data and data quality of the dual redundant links, effectively promote the accuracy and effectiveness of the collected data, and can also promote the efficiency of data processing and collection through item-by-item collection, and improve the effectiveness of the selection of collected data.

[0036] Figure 1 - Figure 3 , Fig.11 and Fig.12It is shown that after receiving the link insertion and withdrawal data and interruption data transmitted by the link insertion and withdrawal status acquisition module and the link terminal status acquisition module respectively, the link comprehensive judgment module makes a comprehensive judgment on the status of the dual redundant links to ensure the effectiveness of data acquisition, and then transmits the comprehensive data to the reserved verification processing module. The quality comprehensive judgment module judges the quality of the data transmitted by the dual redundant links to ensure the accuracy of the data, and then transmits the quality data to the reserved verification processing module. The reserved verification processing module selects and distinguishes the data transmitted by the dual redundant links according to the comprehensive data and quality data, and transmits the access data to the access data output module, and transmits the abnormal data to the abnormal data output module. The access data output module and the abnormal data output module simultaneously transmit the data to the verification data receiving module, and can pre-process and classify the collected data while transmitting accurate and effective data to the verification data receiving module, effectively improving the rate of data calculation and abnormal processing of the subsequent verification data processing module, promoting the applicability and timely response of the device body 1 and the monitoring system to power grid frequency fluctuations, and ensuring the stability and security of the power grid.

[0037] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A monitoring system for a low-frequency load shedding device, characterized in that: The invention comprises a device body (1), an actuator (2) arranged in the device body (1), a DSP operation processing unit mounted in the device body (1), and a double set of redundant links connected to the device body (1), wherein the input end of the DSP operation processing unit is connected to a double set of redundant link data acquisition unit, a dispatching and control feedback unit, a power grid parameter acquisition unit, a full meteorological data acquisition unit, and a reserved re-verification unit; The output end of the DSP operation processing unit is connected to the load dispatching and control unit, the trend prediction unit and the load control emergency recovery unit. The output end of the trend prediction unit is connected to the prediction and dispatching emergency unit. The input ends of the reservation re-verification unit and the dispatching and control feedback unit are both connected to the dual sets of redundant link data acquisition unit signals. The actuator (2) comprises an actuator stator (22) fixedly arranged therein and a main actuator plate (21) rotatably arranged therein, and the main actuator plate (21) cooperates with the actuator stator (22), a compensation conversion mechanism (3) is fixedly arranged at the lower end of the actuator stator (22), and a secondary actuator plate (4) respectively cooperating with the main actuator plate (21) and the actuator stator (22) is fixedly connected to the lower end of the compensation conversion mechanism (3); The input end of the dual redundant link data acquisition unit is connected to the dual redundant link signal, the input ends of the power grid parameter acquisition unit and the full meteorological data acquisition unit are both connected to the monitoring center signal, the output end of the load dispatching and control unit is connected to the execution mechanism (2) signal, the output end of the prediction and dispatching emergency unit is respectively connected to the DSP operation processing unit and the load dispatching and control unit signal, and the output end of the load control emergency recovery unit is connected to the compensation conversion mechanism (3) signal.

2. The monitoring system for an under-frequency load shedding device according to claim 1, characterized in that: The compensation conversion mechanism (3) comprises an elastic sleeve (31) fixedly connected to the lower end of the actuator stator (22); the lower end of the elastic sleeve (31) is fixedly connected to a secondary actuator (4); the upper end of the secondary actuator (4) is fixedly connected to a plurality of connecting wires (41); the lower ends of the connecting wires (41) penetrate the elastic sleeve (31) and are fixedly connected to the actuator stator (22); the upper and lower inner walls of the elastic sleeve (31) are fixedly connected to an electromagnetic control block (32); and the output end of the load control emergency recovery unit is signal-connected to the electromagnetic control block (32).

3. The monitoring system for a low-frequency load shedding device according to claim 2, characterized in that: The electromagnetic control blocks (32) at two corresponding upper and lower positions are fixedly connected to one end thereof and are close to each other with an elastic trigger strip (33); the input end of the DSP operation processing unit is also connected to a compensation mechanism state feedback unit; and the input end of the compensation mechanism state feedback unit is signal-connected to the elastic trigger strip (33).

4. The monitoring system for an under-frequency load shedding device according to claim 1, characterized in that: The input end of the DSP operation processing unit is also connected to a closing data acquisition unit, and the input end of the closing data acquisition unit is connected to a signal of an actuator (2) arranged in the device body (1).

5. The monitoring system for an under-frequency load shedding device according to claim 4, characterized in that: The DSP operation processing unit includes a data collection receiving module and a verification data receiving module. The input end of the data collection receiving module is respectively connected to the dual redundant link data collection unit, the power grid parameter collection unit, the full meteorological data collection unit and the closing data collection unit signal. The output end of the data collection receiving module is connected to the data rough processing module; The input end of the verification data receiving module is respectively connected to the reserved re-verification unit, the scheduling control feedback unit and the prediction scheduling emergency unit signal, and the output end of the verification data receiving module is connected to the verification data processing module; The output ends of the data rough processing module and the verification data processing module are both connected to the comprehensive optimization processing module by signal, the output end of the comprehensive optimization processing module is connected to the optimization scheduling instruction transmission module, the output end of the data rough processing module is also connected to the optimization scheduling instruction transmission module by signal, and the instruction priority of the data rough processing module is lower than the instruction priority of the comprehensive optimization processing module; The output end of the optimization dispatch instruction transmission module is respectively connected to the load dispatch control unit, the load control emergency recovery unit and the trend prediction unit by signal.

6. The monitoring system for an under-frequency load shedding device according to claim 1, characterized in that: The reserved re-verification unit includes a link comprehensive judgment module and a quality comprehensive judgment module, the output ends of the link comprehensive judgment module and the quality comprehensive judgment module are connected to the reserved verification processing module, and the output end of the reserved verification processing module is connected to the access data output module and the abnormal data output module; The input end of the link comprehensive judgment module is connected to the link launch and withdrawal status collection module and the link terminal status collection module. The input ends of the link launch and withdrawal status collection module, the link final status collection module and the quality comprehensive judgment module are all connected to the dual sets of redundant link data collection unit signals, and the output ends of the access data output module and the abnormal data output module are all connected to the DSP operation processing unit signals.

7. A monitoring system for an under-frequency load shedding device according to claim 6, characterized in that: The dual redundant links include an A link and a B link respectively connected to the device body (1) by signals. The link launch / withdrawal status acquisition module acquires launch / withdrawal status data of the dual redundant links through a dual redundant link data acquisition unit. The launch / withdrawal status data includes launch / withdrawal data of the A link, launch / withdrawal data of the B link, and common launch / withdrawal data of the A link and the B link. The link terminal status acquisition module acquires the interruption status data of the dual redundant links through the dual redundant link data acquisition unit, and the interruption status data includes the interruption data of the A set link, the interruption data of the B set link, and the common interruption data of the A set link and the B set link; The quality comprehensive judgment module collects and judges the data quality of the dual redundant links through the dual redundant link data collection units. The data quality includes the data quality of the A set of links and the data quality of the B set of links, and then assists the reserved verification processing module to judge the validity of the data quality transmitted by the link comprehensive judgment module.

8. The monitoring system for an under-frequency load shedding device according to claim 1, characterized in that: The output end of the DSP operation processing unit is also connected to a data display unit, and the output end of the data display unit is connected to a display and a display lamp bead signal arranged at the left end of the device body (1).

9. The monitoring system for an under-frequency load shedding device according to claim 1, characterized in that: The device body (1) is connected to the dual redundant links and the monitoring center signal via a remote motor communication channel, and the remote motor communication channel adopts the IEC104 protocol.

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