CN111641214A - Stable quota monitoring and checking system - Google Patents
Stable quota monitoring and checking system Download PDFInfo
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- CN111641214A CN111641214A CN202010665733.2A CN202010665733A CN111641214A CN 111641214 A CN111641214 A CN 111641214A CN 202010665733 A CN202010665733 A CN 202010665733A CN 111641214 A CN111641214 A CN 111641214A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
- H02J3/144—Demand-response operation of the power transmission or distribution network
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/261—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations
- H02H7/262—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00002—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by monitoring
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a stable quota monitoring and checking system, which comprises: the device comprises a stable quota device, a quota monitoring and analyzing device, a relay protection processing device and a data analyzing device. The method analyzes the stable quota and checks the protection fixed value by monitoring and controlling the quota in real time, analyzes whether the fixed value meets the requirements of protection sensitivity and power grid stability on the basis of quota control, avoids the condition that the fixed value does not meet the requirements of sensitivity and selectivity only by considering a large mode and a small mode, and assists an operation mode analyzer to analyze the influence of the change of a relay protection mode or the fixed value on the stable level.
Description
Technical Field
The invention relates to the field of electric power stability, in particular to a stable quota monitoring and checking system.
Background
The grid frame and the relay protection device are the basis of the safety and stability of the power grid, and the safety and stability control of the power grid is generally carried out by adopting a stable operation limit and a relay protection fixed value at present.
Due to the fact that the actual operation mode of the power grid is changed, operators cannot accurately master the adaptability of related limits and protection fixed values to the actual operation mode in real time. Therefore, how to perform quota control on the power grid system, and the real-time monitoring and analysis of the stable quota and the check of the protection fixed value become key factors for ensuring the reliability of the power grid.
Disclosure of Invention
In order to solve the above-mentioned defects and shortcomings in the prior art, the present invention provides a stable quota monitoring and checking system, which comprises: the system comprises a stable quota device, a quota monitoring and analyzing device, a relay protection processing device and a data analyzing device; wherein.
The stable quota device is used for.
(1) Voltage stabilization control, namely entering conventional load control or power grid emergency control, wherein the conventional load control sends a load switching instruction to a master station in the same area according to the calculation results of automatic control and auxiliary decision; the method comprises the following steps that a main acquisition station is used for carrying out partition calculation and regional control according to a scheduling load cutting instruction, then the main station directly issues a batch quick control instruction to a field interactive terminal, the terminal cuts off a corresponding secondary load line, and a user cannot automatically switch on before the stable control time is over; when the main station sends an instruction for releasing the rapid control load line or the stable control time is over, the closing condition is recovered, and the user can close the corresponding line; when the power grid has an emergency fault, a load shedding quota instruction is issued to a rapid load shedding central station according to a calculation result, the central station issues a control instruction to an interactive terminal through a centralized control station, and the terminal cuts off a corresponding load line according to a preset cutting line combination.
(2) In-situ quota control, the terminal automatically monitors the current load change, when the slip power of the terminal is greater than a control fixed value, a power overrun alarm signal is sent out according to the input control round sequence and the alarm delay time requirement, and meanwhile, power overrun time timing is started; when the power over-limit timing time is longer than the current first power control set alarm time, if the slip power is still larger than the control fixed value, recording the current load power, and then executing a first round of tripping; if the slip power is still larger than the control fixed value after tripping, sequentially executing next tripping according to conditions until the slip power of the user load is lower than the control fixed value; when the slip power is smaller than the power control fixed value, the remaining round switches are not tripped any more; and recording the current load power 2min after the trip of the turn and storing for later reference.
The local quota control also comprises the judgment of a terminal power control mode, and the judgment mode is as follows.
1) When the terminal is in a power conservation state or a removal state, the terminal works in a power conservation mode; otherwise, turning to 2) to judge.
The power protection state refers to that after the power protection state is put into, the control logic executes, but does not output a tripping signal, namely, the user load is not cut off; the rejecting state refers to that after the terminal receives the rejecting input command, the terminal does not respond to any broadcast command or terminal group address command until the rejecting exit command is received; and, only when the terminal is in the normal state, allow to control the exit; and the terminal automatically enters a power conservation state after the communication interruption is overtime, and automatically exits the power conservation state after the communication is recovered.
2) When all control rounds of the total adding group exit, or a slip power calculation window is not filled, or a terminal fault function is locked, the operation is in an idle mode; otherwise, turning to the step 3).
3) When the total adding group is put into the current power down control and within the effective control time of the total adding group, the total adding group works in a current first power control mode; otherwise, turning to 4) for judgment.
The first power control mode is a local limit control taking the current power reduction control power as a power fixed value, and when the power reduction control command is input, the current time is within the effective time of the reduction control, and the security fixed value is greater than 0, the first power control mode is entered to execute the power reduction control.
4) When the total adding group reports and stops control input, the current time is in the reporting and stopping effective control time and the power control fixed value is not 0, the total adding group works in a second power control mode; otherwise, turning to 5) to judge.
And the master station sends the report stop control parameters to the terminal according to the report stop start time and the report stop time applied by the client, and the terminal monitors the current load change in the report stop time period after receiving the report stop control input command and executes the fixed value local limit control of the second power control mode.
5) When the total station rest control is put into operation, the current date is in the station rest day, the current time is in the effective control time of the station rest day, and the power control fixed value is not 0, the total station rest control system works in a third power control mode; otherwise, turning to 6) to judge.
And after receiving the command of putting into the station rest control, the terminal monitors the current load change in the control time interval of the station rest day and executes the local quota control according to the fixed value of the third power control.
6) When the total group period control input and the control period input at the current time are input, the control period in the input power control scheme has a corresponding power control fixed value and is not 0, and the power control period at the control period is a controllable period, wherein the control state is control 1 or control 2, and the total group period control input works in a fourth power control mode; otherwise, turning to 7) for judgment.
After receiving the periodic control input command, the terminal monitors the current load change in the effective control period of the command input, calculates the power fixed value of the time period according to the periodic power control fixed value corresponding to the command input, and executes the local quota control according to the control fixed value, wherein the power fixed value = the periodic power control fixed value (1 + floating coefficient).
7) And when the above conditions are not met, the system works in an idle mode.
(3) Remote quota control, wherein after receiving a master station trip command, a terminal acquires a delay time parameter, executes the trip command after delaying alarm time, and controls a load switch of a corresponding round according to a round parameter; meanwhile, the terminal sends an alarm to inform a user and records information such as load power, trip time and the like before and after tripping; and after the terminal sends a command allowing the user to switch on or the remote control power limiting time is over, an alarm is sent to inform the user so that the user can switch on automatically and the tripping signal is removed.
After the electricity charge management control function is activated, the master station controls the pre-purchased electricity quantity of the user, calculates the residual electricity quantity according to the pre-purchased electricity quantity of the user and the collected electricity consumption of the electricity meter, controls the trip delay time according to the issued electricity charge management command and cuts off the line of the corresponding turn of the user when the residual electricity quantity is less than 0 or less than the arrearage alarm electricity quantity; and when the pre-purchased electric quantity control or the power conservation is released, the closing condition is recovered.
The quota monitoring and analyzing device is used for monitoring and analyzing the quota.
(1) And monitoring the limit execution condition, namely monitoring the execution condition of the stable limit of the power grid in real time. And automatically acquiring stable quota, counting the real-time power flow of each quota corresponding to the control element, calculating the quota margin of the control element, giving alarm information if the actual power flow exceeds the quota, and drawing a historical comparison curve of the actual power flow of the control element and the controlled quota.
(2) And (4) carrying out quota safety analysis, making the operation quota of the power grid off line, and carrying out safety check on the stable quota of the power grid. The method comprises the steps of automatically acquiring real-time data of a power grid, generating a data file for real-time stable calculation, regularly scanning N-1 or same-pole different-name-phase faults of the whole power grid by using a power grid calculation analysis program, if a single element fault occurs in the power grid in actual operation, a relay protection acts correctly, the problems of thermal stability and transient stability occur, and warning information is given; and automatically acquiring an actual relay protection mode, updating the protection action behavior after the power grid fails in the stable calculation, and identifying the influence of the change of the protection mode on the stable quota. And meanwhile, actual switching-on and switching-off information in the substation is obtained, topology in the substation is refined, and influence of switching state change in the substation on stable quota is verified.
The relay protection processing device is used for.
(1) The examination and query of the protection constant value is interfaced with a relay protection fault information system database, the examination and query of the constant value are carried out, and the query can be carried out according to the types, belonged units, stations, equipment names and protection names of the protection, so that the setting value of the field relay protection device can be queried in real time.
(2) And (4) analyzing and checking the protection constant value. According to the sensitivity requirement, the output protection constant value is set in a large and small mode, the fault minimum fault current at the tail end of the line is calculated in a large and small mode, then the bus-tie independent overcurrent protection constant value is set according to the sensitivity requirement, the actual operation mode of the power grid or the load flow during the power transmission starting period is avoided, and the operation mode during the starting period of the new equipment is configured. The method comprises the following steps: the method comprises the steps of automatically acquiring real-time data, generating a data file for calculating the real-time short-circuit current, calculating and analyzing the program for calculating and analyzing the real-time short-circuit current by using a power grid short-circuit current, selecting elements and fault types to calculate the short-circuit current, performing short-circuit calculation of specified elements according to the real-time data, analyzing a short-circuit calculation result file, writing the short-circuit calculation result file into a short-circuit current calculation result base, performing sensitivity calculation according to a short-circuit current calculation result and a protection setting value, comparing the short-circuit current calculation result with a relay protection constant value acquired in real time, analyzing whether the protection. When the sensitivity has a margin in the actual mode, the protection setting value is improved, and whether the setting value can avoid the actual load current during the power transmission starting period of the line is verified; and calculating the sensitivity in a real-time mode aiming at the constant value of the main protection of the element, and checking whether the setting value in the large and small operation modes of the power grid is suitable for the sensitivity requirement of the real-time mode.
The data analysis device is used for analyzing the data.
And acquiring relevant data of a monitoring system, relay protection and fault recording through a station control layer network to establish a substation panoramic database. By comprehensively analyzing the panoramic data of the transformer substation, the sequence control of the transformer substation, the source end maintenance and the equipment state information visualization are realized. The analog quantity and switch state quantity information, the relay protection information and the measurement information collected by the monitoring system are analyzed and processed, the processed information is uploaded to a dispatching center, and two-stage distributed state estimation of the transformer substation and the dispatching center is carried out.
Preferably, the substation-level distributed state estimation carries out topology analysis and state estimation on data collected in the substation, synchronously distinguishes topology errors and bad data, obtains topological structure, bus voltage and branch power data, takes time scale, generates a substation-level graph, model and library integrated network model by the substation, the distributed substation network models are connected in a butt joint mode to form a global power grid model through a power dispatching data network and are transmitted to a dispatching center through a power dispatching data network, meanwhile, the intelligent alarm of the transformer substation level is from signals of a monitoring system, relay protection, fault recording and on-line monitoring of equipment, extracting and analyzing information related to alarm in real time, extracting a fault event chain reflecting a fault evolution process by utilizing a time constraint relation among equipment faults, protection and breaker actions according to the time sequence characteristics of alarm information, and identifying breakpoint alarm, error alarm and missing alarm. The analysis result and the output information of the intelligent alarm of the transformer substation are transmitted to a dispatching center in real time through a dispatching data network, and the dispatching center splices the intelligent alarm information of each transformer substation and then provides final accident reason information and comprehensive alarm information.
The method analyzes the stable quota and checks the protection fixed value by monitoring and controlling the quota in real time, analyzes whether the fixed value meets the requirements of protection sensitivity and power grid stability on the basis of quota control, avoids the condition that the fixed value does not meet the requirements of sensitivity and selectivity only by considering a large mode and a small mode, and assists an operation mode analyzer to analyze the influence of the change of a relay protection mode or the fixed value on the stable level.
Drawings
Fig. 1 is a structural diagram of a stability quota monitoring and checking system according to the present invention.
Detailed Description
As shown in fig. 1, the present invention provides a stable quota monitoring and checking system, which includes: the system comprises a stable quota device, a quota monitoring and analyzing device, a relay protection processing device and a data analyzing device; wherein.
The stable quota device is used for.
(1) Voltage stabilization control, namely entering conventional load control or power grid emergency control, wherein the conventional load control sends a load switching instruction to a master station in the same area according to the calculation results of automatic control and auxiliary decision; the method comprises the following steps that a main acquisition station is used for carrying out partition calculation and regional control according to a scheduling load cutting instruction, then the main station directly issues a batch quick control instruction to a field interactive terminal, the terminal cuts off a corresponding secondary load line, and a user cannot automatically switch on before the stable control time is over; when the main station sends an instruction for releasing the rapid control load line or the stable control time is over, the closing condition is recovered, and the user can close the corresponding line; when the power grid has an emergency fault, a load shedding quota instruction is issued to a rapid load shedding central station according to a calculation result, the central station issues a control instruction to an interactive terminal through a centralized control station, and the terminal cuts off a corresponding load line according to a preset cutting line combination.
(2) In-situ quota control, the terminal automatically monitors the current load change, when the slip power of the terminal is greater than a control fixed value, a power overrun alarm signal is sent out according to the input control round sequence and the alarm delay time requirement, and meanwhile, power overrun time timing is started; when the power over-limit timing time is longer than the current first power control set alarm time, if the slip power is still larger than the control fixed value, recording the current load power, and then executing a first round of tripping; if the slip power is still larger than the control fixed value after tripping, sequentially executing next tripping according to conditions until the slip power of the user load is lower than the control fixed value; when the slip power is smaller than the power control fixed value, the remaining round switches are not tripped any more; and recording the current load power 2min after the trip of the turn and storing for later reference.
The local quota control also comprises the judgment of a terminal power control mode, and the judgment mode is as follows.
1) When the terminal is in a power conservation state or a removal state, the terminal works in a power conservation mode; otherwise, turning to 2) to judge.
The power protection state refers to that after the power protection state is put into, the control logic executes, but does not output a tripping signal, namely, the user load is not cut off; the rejecting state refers to that after the terminal receives the rejecting input command, the terminal does not respond to any broadcast command or terminal group address command until the rejecting exit command is received; and, only when the terminal is in the normal state, allow to control the exit; and the terminal automatically enters a power conservation state after the communication interruption is overtime, and automatically exits the power conservation state after the communication is recovered.
2) When all control rounds of the total adding group exit, or a slip power calculation window is not filled, or a terminal fault function is locked, the operation is in an idle mode; otherwise, turning to the step 3).
3) When the total adding group is put into the current power down control and within the effective control time of the total adding group, the total adding group works in a current first power control mode; otherwise, turning to 4) for judgment.
The first power control mode is a local limit control taking the current power reduction control power as a power fixed value, and when the power reduction control command is input, the current time is within the effective time of the reduction control, and the security fixed value is greater than 0, the first power control mode is entered to execute the power reduction control.
4) When the total adding group reports and stops control input, the current time is in the reporting and stopping effective control time and the power control fixed value is not 0, the total adding group works in a second power control mode; otherwise, turning to 5) to judge.
And the master station sends the report stop control parameters to the terminal according to the report stop start time and the report stop time applied by the client, and the terminal monitors the current load change in the report stop time period after receiving the report stop control input command and executes the fixed value local limit control of the second power control mode.
5) When the total station rest control is put into operation, the current date is in the station rest day, the current time is in the effective control time of the station rest day, and the power control fixed value is not 0, the total station rest control system works in a third power control mode; otherwise, turning to 6) to judge.
And after receiving the command of putting into the station rest control, the terminal monitors the current load change in the control time interval of the station rest day and executes the local quota control according to the fixed value of the third power control.
6) When the total group period control input and the control period input at the current time are input, the control period in the input power control scheme has a corresponding power control fixed value and is not 0, and the power control period at the control period is a controllable period, wherein the control state is control 1 or control 2, and the total group period control input works in a fourth power control mode; otherwise, turning to 7) for judgment.
After receiving the periodic control input command, the terminal monitors the current load change in the effective control period of the command input, calculates the power fixed value of the time period according to the periodic power control fixed value corresponding to the command input, and executes the local quota control according to the control fixed value, wherein the power fixed value = the periodic power control fixed value (1 + floating coefficient).
7) And when the above conditions are not met, the system works in an idle mode.
The sum group is a combination (power) consisting of several lines (primary power).
(3) Remote quota control, wherein after receiving a master station trip command, a terminal acquires a delay time parameter, executes the trip command after delaying alarm time, and controls a load switch of a corresponding round according to a round parameter; meanwhile, the terminal sends an alarm to inform a user and records information such as load power, trip time and the like before and after tripping; and after the terminal sends a command allowing the user to switch on or the remote control power limiting time is over, an alarm is sent to inform the user so that the user can switch on automatically and the tripping signal is removed.
After the electricity charge management control function is activated, the master station controls the pre-purchased electricity quantity of the user, calculates the residual electricity quantity according to the pre-purchased electricity quantity of the user and the collected electricity consumption of the electricity meter, controls the trip delay time according to the issued electricity charge management command and cuts off the line of the corresponding turn of the user when the residual electricity quantity is less than 0 or less than the arrearage alarm electricity quantity; and when the pre-purchased electric quantity control or the power conservation is released, the closing condition is recovered.
The quota monitoring and analyzing device is used for monitoring and analyzing the quota.
(1) And monitoring the limit execution condition, namely monitoring the execution condition of the stable limit of the power grid in real time. And automatically acquiring stable quota, counting the real-time power flow of each quota corresponding to the control element, calculating the quota margin of the control element, giving alarm information if the actual power flow exceeds the quota, and drawing a historical comparison curve of the actual power flow of the control element and the controlled quota.
The function not only can monitor the execution condition of the stable quota to ensure the stable operation of the power grid, but also can assist operation analysis personnel to find problems in the operation of the power grid by observing a historical comparison curve and adjust the operation mode in time. And finding that the late peak is closest to the operation limit, the power grid operation management personnel can take corresponding measures in advance according to the characteristics, and the situation that remedial measures are taken only at the late peak is avoided.
(2) And (4) carrying out quota safety analysis, making the operation quota of the power grid off line, and carrying out safety check on the stable quota of the power grid. The method comprises the steps of automatically acquiring real-time data of a power grid, generating a data file for real-time stable calculation, regularly scanning N-1 or same-pole different-name-phase faults of the whole power grid by using a power grid calculation analysis program, if a single element fault occurs in the power grid in actual operation, a relay protection acts correctly, the problems of thermal stability and transient stability occur, and warning information is given; and automatically acquiring an actual relay protection mode, updating the protection action behavior after the power grid fails in the stable calculation, and identifying the influence of the change of the protection mode on the stable quota. And meanwhile, actual switching-on and switching-off information in the substation is obtained, topology in the substation is refined, and influence of switching state change in the substation on stable quota is verified.
The relay protection processing device is used for.
(1) The examination and query of the protection constant value is interfaced with a relay protection fault information system database, the examination and query of the constant value are carried out, and the query can be carried out according to the types, belonged units, stations, equipment names and protection names of the protection, so that the setting value of the field relay protection device can be queried in real time.
(2) And (4) analyzing and checking the protection constant value. According to the sensitivity requirement, the output protection constant value is set in a large and small mode, the fault minimum fault current at the tail end of the line is calculated in a large and small mode, then the bus-tie independent overcurrent protection constant value is set according to the sensitivity requirement, the actual operation mode of the power grid or the load flow during the power transmission starting period is avoided, and the operation mode during the starting period of the new equipment is configured. The method comprises the following steps: the method comprises the steps of automatically acquiring real-time data, generating a data file for calculating the real-time short-circuit current, calculating and analyzing the program for calculating and analyzing the real-time short-circuit current by using a power grid short-circuit current, selecting elements and fault types to calculate the short-circuit current, performing short-circuit calculation of specified elements according to the real-time data, analyzing a short-circuit calculation result file, writing the short-circuit calculation result file into a short-circuit current calculation result base, performing sensitivity calculation according to a short-circuit current calculation result and a protection setting value, comparing the short-circuit current calculation result with a relay protection constant value acquired in real time, analyzing whether the protection. When the sensitivity has a margin in the actual mode, the protection setting value is improved, and whether the setting value can avoid the actual load current during the power transmission starting period of the line is verified; and calculating the sensitivity in a real-time mode aiming at the constant value of the main protection of the element, and checking whether the setting value in the large and small operation modes of the power grid is suitable for the sensitivity requirement of the real-time mode.
The data analysis device is used for analyzing the data.
And acquiring relevant data of a monitoring system, relay protection and fault recording through a station control layer network to establish a substation panoramic database. By comprehensively analyzing the panoramic data of the transformer substation, the sequence control of the transformer substation, the source end maintenance and the equipment state information visualization are realized. The analog quantity and switch state quantity information, the relay protection information and the measurement information collected by the monitoring system are analyzed and processed, the processed information is uploaded to a dispatching center, and two-stage distributed state estimation of the transformer substation and the dispatching center is carried out.
Preferably, the substation-level distributed state estimation carries out topology analysis and state estimation on data collected in the substation, synchronously distinguishes and analyzes topology errors and bad data, obtains data of a topology structure, bus voltage and branch power (or current), carries time scales, generates a station-level graph, a model and a library integrated network model (comprising a single line graph, the topology structure and static parameters) by the substation, transmits the station-level graph, the model and the library integrated network model to a dispatching center through a power dispatching data network, the dispatching center joints and splices the distributed substation network models into a global power grid model, simultaneously extracts and analyzes information related to alarm in real time from signals of a monitoring system, relay protection, fault recording and equipment online monitoring, extracts a fault event chain reflecting a fault evolution process by utilizing a time constraint relation between equipment faults and protection and breaker actions according to the time sequence characteristics of alarm information, and recognizing breakpoint alarm, error alarm and missing alarm. The analysis result and the output information of the intelligent alarm of the transformer substation are transmitted to a dispatching center in real time through a dispatching data network, and the dispatching center splices the intelligent alarm information of each transformer substation and then provides final accident reason information and comprehensive alarm information.
The conventional transformer substation is mainly monitored in a background, and corresponding application functions need to be expanded in the intelligent transformer substation to meet the intelligent application requirements. An integrated intelligent platform is required to be constructed, relevant data such as measurement and control, protection, quota and state detection are integrated, a substation panoramic database is established, and functions such as substation sequence control, source end maintenance, equipment state information visualization, substation distributed state estimation, substation intelligent alarm and fault diagnosis analysis are achieved.
The stable quota device, the quota monitoring and analyzing device, the relay protection processing device and the data analyzing device can realize the functions of the device through corresponding modules, the stable quota device, the quota monitoring and analyzing device, the relay protection processing device and the data analyzing device are connected with each other through logic or electricity, and the specific functions of the modules can be realized by executing program codes stored in a memory by a physical processor.
The method analyzes the stable quota and checks the protection fixed value by monitoring and controlling the quota in real time, analyzes whether the fixed value meets the requirements of protection sensitivity and power grid stability on the basis of quota control, avoids the condition that the fixed value does not meet the requirements of sensitivity and selectivity only by considering a large mode and a small mode, and assists an operation mode analyzer to analyze the influence of the change of a relay protection mode or the fixed value on the stable level.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (2)
1. A stability quota monitoring and checking system, comprising: the system comprises a stable quota device, a quota monitoring and analyzing device, a relay protection processing device and a data analyzing device; wherein the content of the first and second substances,
the stable quota device is used for:
(1) voltage stabilization control, namely entering conventional load control or power grid emergency control, wherein the conventional load control sends a load switching instruction to a master station in the same area according to the calculation results of automatic control and auxiliary decision; the method comprises the following steps that a main acquisition station is used for carrying out partition calculation and regional control according to a scheduling load cutting instruction, then the main station directly issues a batch quick control instruction to a field interactive terminal, the terminal cuts off a corresponding secondary load line, and a user cannot automatically switch on before the stable control time is over; when the main station sends an instruction for releasing the rapid control load line or the stable control time is over, the closing condition is recovered, and the user can close the corresponding line; when the power grid has an emergency fault, a load shedding quota instruction is issued to a rapid load shedding central station according to a calculation result, the central station issues a control instruction to an interactive terminal through a centralized control station, and the terminal cuts off a corresponding load line according to a preset cutting line combination;
(2) in-situ quota control, the terminal automatically monitors the current load change, when the slip power of the terminal is greater than a control fixed value, a power overrun alarm signal is sent out according to the input control round sequence and the alarm delay time requirement, and meanwhile, power overrun time timing is started; when the power over-limit timing time is longer than the current first power control set alarm time, if the slip power is still larger than the control fixed value, recording the current load power, and then executing a first round of tripping; if the slip power is still larger than the control fixed value after tripping, sequentially executing next tripping according to conditions until the slip power of the user load is lower than the control fixed value; when the slip power is smaller than the power control fixed value, the remaining round switches are not tripped any more; recording the current load power 2min after the trip of the turn and storing for later reference;
the local quota control also comprises the judgment of a terminal power control mode, and the judgment mode is as follows:
1) when the terminal is in a power conservation state or a removal state, the terminal works in a power conservation mode; otherwise, turning to the step 2) for judgment;
the power protection state refers to that after the power protection state is put into, the control logic executes, but does not output a tripping signal, namely, the user load is not cut off; the rejecting state refers to that after the terminal receives the rejecting input command, the terminal does not respond to any broadcast command or terminal group address command until the rejecting exit command is received; and, only when the terminal is in the normal state, allow to control the exit; the terminal automatically enters a power conservation state after the communication interruption is overtime, and automatically exits the power conservation state after the communication is recovered;
2) when all control rounds of the summation group exit, or a slip power calculation window is not filled, or a terminal fault function is locked, the summation group works in an idle mode; otherwise, turning to the step 3) for judgment;
3) when the total adding group is put into the current power down control and within the effective control time of the total adding group, the total adding group works in a current first power control mode; otherwise, turning to 4) for judgment;
the first power control mode is a local limit control taking the current power reduction control power as a power fixed value, and when a power reduction control command is input, the current time is within the effective time of reduction control and the security fixed value is greater than 0, the first power control mode is entered to execute the power reduction control;
4) when the total adding group reports and stops control input, the current time is in the reporting and stopping effective control time and the power control fixed value is not 0, the total adding group works in a second power control mode; otherwise, turning to 5) for judgment;
according to the time of the start and stop of the report applied by the client, the master station sends down report stop control parameters to the terminal, and after the terminal receives a report stop control input command, the terminal monitors the current load change in the report stop time period and executes the fixed value local limit control of the second power control mode;
5) when the total station rest control is put into operation, the current date is in the station rest day, the current time is in the effective control time of the station rest day, and the power control fixed value is not 0, the total station rest control system works in a third power control mode; otherwise, turning to 6) for judgment;
after receiving the command of putting into the station rest control, the terminal monitors the current load change in the control time interval of the station rest day and executes the local quota control according to the fixed value of the third power control;
6) when the total group period control input and the control period input at the current time are input, the control period in the input power control scheme has a corresponding power control fixed value and is not 0, and the power control period at the control period is a controllable period, wherein the control state is control 1 or control 2, and the total group period control input works in a fourth power control mode; otherwise, turning to 7) for judgment;
after receiving a periodic control input command, the terminal monitors the current load change in an effective control period of the command input, calculates a power fixed value of the time period according to a periodic power control fixed value corresponding to the command input, and executes local quota control according to the control fixed value, wherein the power fixed value = the periodic power control fixed value (1 + floating coefficient);
7) when all the above conditions are not met, the system works in an idle mode;
(3) remote quota control, wherein after receiving a master station trip command, a terminal acquires a delay time parameter, executes the trip command after delaying alarm time, and controls a load switch of a corresponding round according to a round parameter; meanwhile, the terminal sends an alarm to inform a user and records information such as load power, trip time and the like before and after tripping; after the terminal sends a command allowing the user to switch on or the remote control power limiting time is over, an alarm is sent to inform the user so that the user can switch on automatically and a tripping signal is removed;
after the electricity charge management control function is activated, the master station controls the pre-purchased electricity quantity of the user, calculates the residual electricity quantity according to the pre-purchased electricity quantity of the user and the collected electricity consumption of the electricity meter, controls the trip delay time according to the issued electricity charge management command and cuts off the line of the corresponding turn of the user when the residual electricity quantity is less than 0 or less than the arrearage alarm electricity quantity; when the pre-purchased electric quantity control or the power protection is removed, the closing condition is recovered;
the quota monitoring and analyzing device is used for:
(1) monitoring the limit execution condition, namely monitoring the execution condition of the stable limit of the power grid in real time; automatically acquiring stable quota, counting real-time power flow of each quota corresponding to a control element, calculating quota margin of the control element, giving alarm information if the actual power flow exceeds the quota, and drawing a historical comparison curve of the actual power flow of the control element and the controlled quota;
(2) carrying out quota safety analysis, establishing the operation quota of the power grid in an off-line manner, and carrying out safety check on the stable quota of the power grid; the method comprises the steps of automatically acquiring real-time data of a power grid, generating a data file for real-time stable calculation, regularly scanning N-1 or same-pole different-name-phase faults of the whole power grid by using a power grid calculation analysis program, if a single element fault occurs in the power grid in actual operation, a relay protection acts correctly, the problems of thermal stability and transient stability occur, and warning information is given; automatically acquiring an actual relay protection mode, updating a protection action behavior after a power grid fault in stable calculation, and identifying the influence of the change of the protection mode on a stable quota; meanwhile, actual switching-on and switching-off information in the substation is obtained, topology in the substation is refined, and influence of switching state change in the substation on stable quota is verified;
the relay protection processing device is used for processing the relay protection;
(1) checking and inquiring the protection constant value, interfacing with a relay protection fault information system database, checking and inquiring and retrieving the protection constant value, and inquiring the setting value of the field relay protection device in real time according to the type, the affiliated unit, the station, the equipment name and the protection name of the protection;
(2) analyzing and checking a protection constant value; setting a discharged protection constant value in a large and small mode according to the sensitivity requirement, calculating the minimum fault current of the fault at the tail end of the line in a large and small mode, then setting a bus-tie independent overcurrent protection constant value according to the sensitivity requirement, avoiding the actual operation mode of the power grid or the load flow during the power transmission starting period, and configuring the operation mode during the starting period of the new equipment; the method comprises the following steps: automatically acquiring real-time data, generating a data file for calculating real-time short-circuit current, calculating and analyzing the short-circuit current by using a power grid short-circuit current, selecting an element and a fault type to calculate the short-circuit current, performing short-circuit calculation of a specified element according to the real-time data, analyzing a short-circuit calculation result file, writing the short-circuit calculation result file into a short-circuit current calculation result base, performing sensitivity calculation according to a short-circuit current calculation result and a protection setting value, comparing the short-circuit current calculation result with a relay protection constant value acquired in real time, analyzing whether the protection constant value meets the requirement of protection sensitivity in a real-time; when the sensitivity has a margin in the actual mode, the protection setting value is improved, and whether the setting value can avoid the actual load current during the power transmission starting period of the line is verified; calculating the sensitivity in a real-time mode aiming at the constant value of main protection of the element, and checking whether the setting value in the large and small operation modes of the power grid is suitable for the sensitivity requirement of the real-time mode;
the data analysis device is used for:
acquiring relevant data of a monitoring system, relay protection and fault recording through a station control layer network to establish a substation panoramic database; the sequence control, source end maintenance and equipment state information visualization of the transformer substation are realized through comprehensive analysis of the panoramic data of the transformer substation; the analog quantity and switch state quantity information, the relay protection information and the measurement information collected by the monitoring system are analyzed and processed, the processed information is uploaded to a dispatching center, and two-stage distributed state estimation of the transformer substation and the dispatching center is carried out.
2. The system of claim 1, wherein the substation-level distributed state estimation performs topology analysis and state estimation on data collected in a substation, synchronously analyzes topology errors and bad data, obtains topology structure, bus voltage and branch power data, carries time scales, generates a substation-level graph, a model and a library integrated network model by the substation, transmits the substation-level graph, the model and the library integrated network model to a dispatching center through a power dispatching data network, the dispatching center joints and splices the distributed substation network models into a global power grid model, simultaneously extracts and analyzes information related to alarm in real time from signals of a monitoring system, relay protection, fault recording and on-line monitoring of equipment, extracts a fault event chain reflecting a fault evolution process by utilizing a time constraint relation between equipment faults and protection and breaker actions according to a time sequence characteristic of alarm information, and identifying a breakpoint alarm, an error alarm and a missing alarm; the analysis result and the output information of the intelligent alarm of the transformer substation are transmitted to a dispatching center in real time through a dispatching data network, and the dispatching center splices the intelligent alarm information of each transformer substation and then provides final accident reason information and comprehensive alarm information.
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