CN102938587B - Intelligent power grid safety and stability early-warning and control method - Google Patents
Intelligent power grid safety and stability early-warning and control method Download PDFInfo
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Abstract
The invention relates to an emergency protection circuit device capable of completing automatic switching when an AC-DC power grid is in an abnormal state, and in particular relates to an intelligent warning and control method dedicated for ensuring safety and stability of the power grid. The method comprises the steps that: an intelligent control master station acquires real-time data of the power grid through an EMS (energy management system), and an intelligent control substation in each zone real-timely monitors the bus voltage of the zone, power-receiving channel overload, main transformer overload in the zone and voltage instability of the power grid in the zone, and starts the power grid safety and stability control operation; the acquired real-time data of the power grid is integrated with the information uploaded by each substation to real-timely form tide section data of the power grid, and the safety and stability of the power grid are evaluated online; and safety and stability early-warning information of the power grid is provided by using the real-time operation data of the power grid to realize safe and stable control of the power grid and to realize the function of the second line of defense of the power system. The method provided by the invention can ensure safe and stable operation of the power grid by regulating a stability control device according to the running condition of the power grid.
Description
Technical field
The present invention relates to can complete when abnormality appears in AC and DC electrical network the emergency protection circuit device for electric of automatic switchover, relate in particular to a kind of intelligent early warning and control method that is exclusively used in electricity net safety stable.
Background technology
EMS (EMS) is the important tool at present provincial and on-line analysis of regional power grid control centre, play important function at auxiliary dispatching person's decision-making level, be the indispensable instrument in control centre, its major function is made up of basic function and two parts of application function.Basic function comprises computer, operating system and EMS support system.Application function comprises that data acquisition and supervision (SCADA), Generation Control (AGC) form with plan and network analysis three parts.Traditional EMS uses online data to carry out analysis and calculation, but the application model of its network analysis function is main or dispatcher asks just to carry out, lay particular emphasis on research mode, and lack from motion tracking operation of power networks state, automatic diagnosis electrical network problem, automatically provide control strategy and operational mode and adjust tactful function.In addition, EMS stresses online static analysis, lacks on-line transient stability, voltage stabilization and dynamic stability analysis function.The stability analysis work of China's electrical network at present mainly relies on off-line simulation and has calculated, off-line simulation calculates can not the exhaustive operating condition likely running into, for ensureing necessary security margin, in schedule mode evaluation work, conventionally adopt extreme mode to study, cause thus result of calculation often relatively conservative, can not bring into play to greatest extent the on-road efficiency of electrical network.Therefore, traditional E MS is difficult to meet the requirement of electrical network being carried out to comprehensive security early warning and decision support.
Chinese invention patent " the integrated control method for coordinating of large electricity net safety stable early warning, prevention and control and emergency control " (patent of invention number: ZL200810133761.9 Granted publication number: CN 101340080B) discloses the integrated control method for coordinating of a kind of large electricity net safety stable early warning, prevention and control and emergency control, and step comprises: gather all kinds of stable states of large electrical network and dynamic data; Real-time matching is when previous mode and historical catastrophe failure form, and that calculates as stability analysis appends forecast failure online; Curve data after utilizing expansion equal-area method to grid simulation carries out data mining, the stability quantization characteristic of extraction system; In the time that electrical network has positive security margin, utilize stability margin and relevant sensitivity analysis technique, carry out that the generator limit is exerted oneself, limit load and stable cross section limit power calculate; In the time that electrical network has negative security margin, carry out prevention and control calculating, emergency control calculating, determine prevention and control measure amount and control cost, emergency control measure amount and control cost thereof; The optimum organization of automatic search prevention and control and emergency control.Set up the integrated frame of the optimization and coordination of security stabilization early warning, prevention and control and emergency control.
Chinese invention patent " the power system voltage stabilization in-service monitoring based on probability and prevention and control method " (patent of invention number: ZL200610013272.0 Granted publication number: CN100382411C) discloses a kind of power system voltage stabilization in-service monitoring and prevention and control method.The method comprises the following steps: that (1) obtains powernet data from EMS and power market transaction platform; (2) determine the probability of equipment failure of this period according to overhaul of the equipments arrangement and each department weather condition; (3) produce sample space by MonteCarlo emulation, each sample is made up of X (flash-up direction) and Y (faulty equipment set) two parts; (4) use voltage stability domain to calculate fast in conjunction with the layered calculation method of vector quantization cluster analysis the voltage stability margin that each sample is corresponding, thereby obtain the probability density distribution of power system voltage stabilization nargin; (5) determine according to the stability margin confidence level of stability margin probability density distribution and appointment in advance the stability margin numerical value that system need to reach, by sensitivity calculations system parameters limiting value and the prevention and control value of voltage stability margin, ensure that by adjustment System operational factor electric power system reaches the voltage stabilization of specifying under confidence level.The present invention has broken away from a large amount of calculating of tradition " point by point method "; From fault, voltage stability domain boundary point directly calculates voltage stability domain boundary point after fault, and avoid re-starting CPF and calculated, be a kind of probability voltage stabilization quick calculation method with hierarchy.
What the most safety stabilization control system of electrical network still adopted at present is " off-line decision-making " technology, the shortcoming of existing safety stabilization control system is apparent, to calculate the control strategy table of stability control device as example: 1. control strategy table dimension is high, data volume is large, calculating and modification amount are large, in the time that system is complicated a little, the combination of the mode of connection of system, trend mode and possible failure mode will reach a very large numerical value; 2. to system conditions bad adaptability, once system condition (as network architecture parameters) changes, just must recalculate analysis; 3. electric power system is a complicated non linear system, again can not be too detailed in the time of forming strategies table, in fact often by operating mode stepping, only consider typical condition.Therefore can only be according to the principle query strategy table of approximate match in the time that reality is used, in the time that system conditions and off-line anticipation operating mode differ larger, easily cause matching error large, even there is mismatch phenomenon; 4. extraction system characteristic quantity needs operations staff's experience and a large amount of calculated off-line; 5. can only be undertaken by partially serious trend mode when stabilizing determination and definite controlled quentity controlled variable, " just very much not just little ", makes result relatively conservative, and affects the economical operation of system; 6. cannot adapt to operating mode beyong contemplation.In view of above situation, the most safety stabilization control system of electrical network at present, still main configuration is as low week, the low pressure load-shedding equipment of the three lines of defence of electrical network, to ensure the stable operation of orphaned partition, and few as the safety and stability control device configuration of the interlocking unit shut algorithm in electrical network second defence line.Being subject to electric ratio, being subject to the continuous increase of capacitance along with electrical network, and the variation of power system operating mode, the particularly enforcement of subregion burst operation, the potential threat of electricity net safety stable strengthens day by day, only rely on three lines of defence to ensure that the stable operation of orphaned partition is more difficult, once there is this type of accident, probably cause the collapse of local system, directly threaten the security and stability of subregion electrical network and even whole large electrical network entirety.These problems are had higher requirement to traditional safety stabilization control system, and some does not even belong to the category of traditional safety stabilization control system, therefore in the urgent need to providing a kind of intelligent and safe to stablize early warning and control method and system.
Summary of the invention
The object of this invention is to provide a kind of intelligent and safe and stablize early warning and control method; be combined as the safety stabilizing devices in electrical network second defence line; and based on electrical network actual time safety stability assessment and electrical network prevention and control decision-making technic; realize on-line decision and the execution of the measure of electrical network emergency control; and electrical network mode adjusts the on-line decision of measure, can provide convenient means to the current short circuit current level reconciliations/cyclization decision-making of electrical network and relay protection constant value check simultaneously.
The present invention solves the problems of the technologies described above adopted technical scheme:
A kind of electrical network intelligent and safe is stablized early warning and control method, stablizes early warning and control system for electrical network intelligent and safe, and described security stabilization early warning and control system are obtained powernet data from EMS, it is characterized in that:
Described security stabilization early warning and control system, by Distributed Computing Platform and multi-level subregion control network, realize early warning and the control of electricity net safety stable, described multi-level subregion control network is by Zhi Kong main website, the intelligence control substation of each subregion of Shou Zhikong main website control, and be connected respectively to several intelligence control terminal stations composition of each intelligence control substation;
Described security stabilization early warning and control method comprise the following steps:
S100) described Zhi Kong main website, by EMS, on-the-spot PMU device and three sources of on-the-spot stable control device, obtains electrical network real time data, monitors all load states that are subject to electric channel of current the whole network;
S200) busbar voltage of intelligence control substation this subregion of Real-Time Monitoring of each subregion, each intelligence control terminal station in each subregion, is uploaded to intelligence control substation in real time by the busbar voltage in this terminal station;
S300) if monitoring, described Zhi Kong main website transshipped by electric channel, select to be subject to the most serious circuit of overload in electric channel, start and be subject to the control of electric channel overload off-loading, seek minimum cutting load amount according to the sensitivity of eliminating overload, control each relevant intelligence control terminal station by corresponding intelligence control substation, carry out the operation of overload cutting load;
Described overload off-loading control procedure comprises the following steps:
S382) obtain the electric channel overload rate that is subject to;
S384) determine and eliminate the required lotus total amount of cutting of overload;
S386) relatively transship the load shedding sensitivity of alternating current circuit according to each subregion and sort from big to small, distribute and cut lotus amount according to load shedding sensitivity, start to assign cutting load instruction to intelligence control substation from highly sensitive subregion with the power step size of fixing;
S388) intelligence control substation is by the load cell at each all subordinaties intelligence control terminal station, according to the unified sequence of load importance, queue up according to priority orders, cross and cut principle selection excision load with minimum, and send to terminal station by under selection result, carry out the corresponding load of excision by terminal station, repetitive cycling is eliminated the required lotus total amount of cutting of overload until meet overload circuit;
S400) if subregion main transformer overload, by boot partition, the intelligence control substation main transformer overload control of this subregion, by relevant intelligence control terminal station in this subregion, carry out the operation of overload cutting load, or, intelligence control substation by Zhi Kong main website and adjacent sectors is mutual, carries out by stages and turns for load or subregion cyclization support operation;
S500) if the busbar voltage that described subregion intelligence control substation monitors this subregion lower than voltage stabilization predetermined value, by boot partition, the intelligence control substation Voltage Instability control of this subregion, by each relevant intelligence control terminal station in this subregion, carry out the operation of subregion low-voltage cutting load;
S600) information that upload the electrical network real time data that Zhi Kong main website comprehensively obtains and each substation, form in real time the trend profile data of current electrical network, the operational mode of identification electrical network, the reliability to data and electric network state and electricity net safety stable carry out online evaluation; Intelligent and safe is stablized the electrical network real time data that early warning and control system collect from three sources, according to update time and data error, selects the most reliable data, for the assessment of Power Network Status Estimation and security and stability; To the EMS system state estimation result data receiving, or the state estimation result of oneself carries out reliability assessment, and the result data not meeting the demands is proposed to alarm; And according to by the data of assessment, carry out the calculating of on-line decision, On-line Control and off-line analysis;
S700) according to obtaining generation schedule, maintenance scheduling and bus load prediction data from EMS dispatching patcher, electrical network is carried out to sunykatuib analysis to the operation of power networks stability of following ultra-short term, export relevant traffic control suggestion, and potential electrical network unstability fault is sent to early warning information, this step comprises following action:
S710) obtain generation schedule, maintenance scheduling and bus load prediction data from scheduling EMS system;
The time of S720) specifying in every day, according to generation schedule, maintenance scheduling and bus load prediction data, generate the following operation of the electrical network analogue data of one day 24 hours future or longer time section;
S730) use the following operation of the electrical network analogue data that generates each time point, the static stability of checking system and transient stability;
S740) all result of calculation is generated to operational report on the same day, as the basis of the same day electrical network being dispatched;
S750) utilize bus load prediction data, the operation of power networks stability of following ultra-short term is analyzed, export relevant traffic control suggestion, and potential electrical network unstability fault is sent to early warning information.
Electrical network intelligent and safe of the present invention is stablized the preferably technical scheme of one of early warning and control method, it is characterized in that described step S300 comprises following action:
S320) be subject to electric channel overload according to circuit overload rate and the judgement of overload delay time;
S340) select to be subject to transship the most serious circuit as controlling target in electric channel;
S360) Real-time Obtaining is subject to the network equivalence profile data of electric channel;
S380), to electing the circuit of controlling target as, start overload off-loading control procedure.
Electrical network intelligent and safe of the present invention is stablized the preferably technical scheme of another kind of early warning and control method, it is characterized in that described step S400 comprises following action:
S410) if default allows by stages to turn for load, required turning for load calculated according to main transformer overload rate in the intelligence control substation of main transformer overload;
S420) the intelligence control substation Xiang Zhikong main website of main transformer overload sends and turns for load request;
S430) adjacent the turned confession subregion of Zhi Kong main website search, selects the lightest subregion of main transformer load as accepting to turn for subregion;
S440) Zhi Kong main website turns for subregion and accepts to turn the intelligence control substation for subregion to request, sends and allows to turn for load order, starts and turns for load operation;
S450) if default allows cyclization to support, the intelligence control substation Xiang Zhikong main website of main transformer overload sends cyclization and supports request;
Whether S460) Zhi Kong main website calculates with each may provide cyclization support power, voltage, short circuit current that subregion carries out after cyclization to meet the demands, and assesses the possibility that cyclization is supported, and selects the subregion of optimum cyclization;
S470) Zhi Kong main website supports subregion and the intelligence control substation that provides cyclization to support subregion to request cyclization, sends startup cyclization and supports order, and startup cyclization is supported and operated;
S490) otherwise, overload off-loading control procedure in the boot partition, intelligence control substation of main transformer overload, carries out cutting load operation.
The better technical scheme of one that electrical network intelligent and safe of the present invention is stablized early warning and control method, is characterized in that described step S500 comprises following action:
S510) busbar voltage that monitors this subregion when intelligence control substation is lower than the first voltage predetermined value, and exceed predetermined delay time, main transformer step-down power exceedes power predetermined value simultaneously, judges that quiescent voltage unstability appears in this subregion, boot partition Voltage Instability control operation;
S520) sort to the intelligence control terminal station in this subregion from low to high by voltage in intelligence control substation, rejects the intelligence control terminal station of voltage higher than second voltage predetermined value simultaneously;
S530) order of low-voltage cutting load is sent to each intelligence control terminal station successively according to institute's alignment order in intelligence control substation, controls the highest load cell of intelligence control terminal station excision our station priority;
S540) control after the cutting load success of intelligence control terminal station, intelligence control substation judges whether the busbar voltage of this subregion recovers stable state; If busbar voltage is recovered stable state, finish the control of subregion low-voltage cutting load; Otherwise return to step S530, send the order of low-voltage cutting load to the intelligence control terminal station of next one;
S550) if traveled through after all sequences, the busbar voltage of this subregion is not recovered stable state yet, returns to step S520, starts the subregion low-voltage control instability of a new round.
The improved technical scheme of one that electrical network intelligent and safe of the present invention is stablized early warning and control method, is characterized in that described step S600 comprises at least one in the following action:
S610) use Power Network Status Estimation result and PQ decomposition algorithm to determine and calculate initial value, utilize Newton-Raphson method to calculate the trend profile data of electrical network;
S620) automatically carry out stability Calculation according to real time data and setting fault collection, adopt the time-domain-simulation algorithm based on element detailed model, determine the transient rotor angle stability nargin of network system;
S630) carry out static voltage security analysis, determine the static voltage stability nargin of current electrical network;
S640) use N-1 criterion to analyze system under N-1 fault and whether keep static voltage stability, if system keeps stable after fault, further calculate the stability margin of system;
S650), by analyzing the sensitivity of nargin index to each control variables, provide prevention and control and strengthen the suggestion of controlling;
S660) according to real time data, electrical network is carried out to transient voltage and frequency safety analysis, provide the error listing that loses transient voltage, frequency stability;
S670) use the method for numerical integration to carry out stability analysis to all fault collection, there is the fault that causes system unstability if find, send stable early warning information, and according to given control principle, determine online and under this malfunction, ensure the required emergency control measure of taking of system stable operation, optimum controlling point and controlled quentity controlled variable are determined in search, generate online and/or Off-line control Policy Table, send on-the-spot stable control device to;
S680) if overhauled by electric channel or loop grid, or electric network fault loss element, cause that electric network state changes, according to the control strategy of up-to-date trend profile data adjustment System, the operating condition that adapts to electrical network changes.
S690) save historical data, utilize the historical data of online data or preservation, carry out Static and dynamic stability off-line analysis.
The invention has the beneficial effects as follows:
1. electrical network intelligent and safe of the present invention is stablized early warning and control method, combine the feature of EMS and traditional safety stabilization control system, use electrical network real-time running data that electricity net safety stable early warning information is provided, load and realize the safety and stability control of electrical network by decontrol, and realize the function in electric power system second defence line, can adjust the behavior of stability control device according to the current operation conditions of electrical network.
2. electrical network intelligent and safe of the present invention is stablized early warning and control method, utilize electrical network real time data to realize on-line decision, not to analyze according to anticipation operating mode, generally there is not mismatch situation, and the development and change of adaptive system automatically, generate the control strategy table of on-the-spot stability control device according to real-time working condition, greatly reduce Policy Table's scale and amount of calculation, do not need to carry out a large amount of calculated off-line analyses, operations staff can be freed from heavy calculated off-line work.
3. electrical network intelligent and safe of the present invention is stablized early warning and control method, by Distributed Computing Platform and multi-level subregion control network, realize early warning and the control of electricity net safety stable, can ensure its continuous, continual highly reliable operation, meet the requirement of electric power secondary system security protection, guarantee the safety of electric power real-time closed-loop supervisory control system and dispatching data network.
Brief description of the drawings
Fig. 1 is the master control flow chart that electrical network intelligent and safe of the present invention is stablized early warning and control method;
Fig. 2 is the flow chart that is subject to electric channel overload Monitoring and Controlling;
Fig. 3 is the flow chart of circuit overload cutting load control;
Fig. 4 is that subregion main transformer overload turns the flow chart of controlling for load;
Fig. 5 is that the flow chart of controlling is supported in the cyclization of subregion main transformer overload;
Fig. 6 is the flow chart of subregion quiescent voltage unstability monitoring;
Fig. 7 uses security stabilization early warning of the present invention and the electricity net safety stable early warning of control method and the structural representation of control system;
Fig. 8 is the flow chart of multi-data source processing.
Embodiment
In order to understand better technique scheme of the present invention, describe in detail further below in conjunction with drawings and Examples.
Electrical network intelligent and safe of the present invention stablizes early warning and control method is stablized early warning and control system for electrical network intelligent and safe, described security stabilization early warning and control system are obtained powernet data from EMS, described security stabilization early warning and control system, by Distributed Computing Platform and multi-level subregion control network, realize early warning and the control of electricity net safety stable, described multi-level subregion control network is by Zhi Kong main website, the intelligence control substation of each subregion of Shou Zhikong main website control, and several intelligence control terminal stations that are connected respectively to each intelligence control substation form, as shown in Figure 7,
The master control flow chart of described security stabilization early warning and control method as shown in Figure 1, comprises the following steps:
S100) described Zhi Kong main website obtains electrical network real time data by EMS, monitors all load states that are subject to electric channel of current the whole network;
S200) busbar voltage of intelligence control substation this subregion of Real-Time Monitoring of each subregion, each intelligence control terminal station in each subregion, is uploaded to intelligence control substation in real time by the busbar voltage in this terminal station;
Zhi Kong main website obtains all interchanges of current the whole network is subject to the load state of electric channel, is subject to electric channel overload judgment rule according to pre-establishing to solve to exchange, and according to circuit overload rate and overload delay judgement overload, selects to control target.
Different overload time delay corresponding to circuit overload rate, the two has the relation of inverse time lag, once a certain interchange is subject to electric line or a few interchanges to be subject to electric line overload to exceed specified scope and exceed corresponding time delay, Zhi Kong main website will exchange the reasoning and the decision process that controlled by electric channel overload for the most serious line start of overload so.
S300) if monitoring, described Zhi Kong main website transshipped by electric channel, select to be subject to the most serious circuit of overload in electric channel, start and be subject to the control of electric channel overload off-loading, seek minimum cutting load amount according to the sensitivity of eliminating overload, control each relevant intelligence control terminal station by corresponding intelligence control substation, carry out the operation of overload cutting load;
S400) if subregion main transformer overload, by boot partition, the intelligence control substation main transformer overload control of this subregion, by relevant intelligence control terminal station in this subregion, carry out the operation of overload cutting load, or, intelligence control substation by Zhi Kong main website and adjacent sectors is mutual, carries out by stages and turns for load or subregion cyclization support operation;
S500) if the busbar voltage that described subregion intelligence control substation monitors this subregion lower than voltage stabilization predetermined value, by boot partition, the intelligence control substation Voltage Instability control of this subregion, by each relevant intelligence control terminal station in this subregion, carry out the operation of subregion low-voltage cutting load;
S600) information that upload the electrical network real time data that Zhi Kong main website comprehensively obtains and each substation, form in real time the trend profile data of current electrical network, the operational mode of identification electrical network, the reliability to data and electric network state and electricity net safety stable carry out online evaluation, carry out On-line Control;
S700) according to obtaining generation schedule, maintenance scheduling and bus load prediction data from EMS dispatching patcher, electrical network is carried out to sunykatuib analysis to the operation of power networks stability of following ultra-short term, export relevant traffic control suggestion, and potential electrical network unstability fault is sent to early warning information.
Intelligent control system has accessed the plant stand in the whole network and subregion, intelligence control substation can be grasped the network load level of this subregion and the trend operating mode with outside coupling critical point at any time, can the different operational mode of recognition system, be subject to electric channel maintenance, loop grid maintenance etc. as exchanged.The information of simultaneously sending on the comprehensive each substation of Zhi Kong main website can form the trend profile data of current electrical network in real time, trend level and the rack that can reflect more accurately system change, when after electric network fault loss element, intelligent control system can be according to the control strategy of up-to-date trend cross section regulation system, thereby makes various strategies that intelligent control system rational analysis goes out all be adapted to the variation of system conditions.
Electrical network intelligent and safe according to the present invention is stablized an embodiment who controlled by electric channel overload of early warning and control method, exchange once Zhi Kong main website has started the reasoning decision process that controlled by electric channel overload, just will come decision-making cutting load total amount and cutting load distribution by means of load shedding sensitivity.Calculating for the load shedding sensitivity of communication channel is carried out taking subregion as unit, so because the speed of the limited this calculating of number of partitions can requirement of real time.
Flow chart shown in Figure 2, step S300 comprises following action:
S320) be subject to electric channel overload according to circuit overload rate and the judgement of overload delay time;
S340) select to be subject to transship the most serious circuit as controlling target in electric channel;
S360) Real-time Obtaining is subject to the network equivalence profile data of electric channel;
S380), to electing the circuit of controlling target as, start overload off-loading control procedure;
Zhi Kong main website relatively transships the load shedding sensitivity of alternating current circuit according to each subregion and sorts from big to small.With a certain fixing power step size, for example (,) 10MW, starting to increase load shedding from highly sensitive subregion, repetitive cycling is until meet the power control target setting of overload alternating current circuit.Major network be subject to the optimization of electric channel overload to cut lotus amount to ask for process as shown in table 1,
Table 5-1 major network is optimized by electric channel overload to cut lotus amount to ask for
| ? | sensitivity 1 subregion | sensitivity 2 subregions | .。。。。。。 | sensitivity n subregion |
| the 1st takes turns distribution | z1L1 | z2L1 | ? | znL1 |
| the 2nd takes turns distribution | z1L2 | z2L2 | ? | znL2 |
| the 3rd takes turns distribution | z1L3 | z2L3 | ? | znL3 |
| .。。。。。 | ? | ? | ? | ? |
| m wheel can cutting load | znLm | znLm | ? | ? |
Can obtain total cutting load amount and the cutting load amount of each subregion according to such Optimizing Search principle, take into account the balance of each subregion inscribe load, again preferentially from the large Zoning resection load of sensitivity, make total cutting load amount less simultaneously.The flow chart of overload off-loading control procedure as shown in Figure 3, comprises the following steps:
S382) obtain the electric channel overload rate that is subject to;
S384) determine and eliminate the required lotus total amount of cutting of overload;
S386) relatively transship the load shedding sensitivity of alternating current circuit according to each subregion and sort from big to small, distribute and cut lotus amount according to load shedding sensitivity, start to assign cutting load instruction to intelligence control substation from highly sensitive subregion with the power step size of fixing;
S388) intelligence control substation is by the load cell at each all subordinaties intelligence control terminal station, according to the unified sequence of load importance, queue up according to priority orders, cross and cut principle selection excision load with minimum, and send to terminal station by under selection result, carry out the corresponding load of excision by terminal station, repetitive cycling is eliminated the required lotus total amount of cutting of overload until meet overload circuit.
Is receiving after the cutting load amount that Zhi Kong main website is assigned intelligence control substation, according to excision priority definite value corresponding to each intelligence control terminal station, excise the load at each intelligence control terminal station by round, in same round, the load at the intelligence control terminal station that priority is high preferentially excises, until institute's cutting load amount meets the lotus amount of cutting that Zhi Kong main website is assigned.Concrete distribution method is as follows: intelligence control substation receives cutting load order and the cutting load amount that master station device is sent, and establishing and needing cutting load amount is Pyq, each intelligence control terminal station under cutting load amount Pyq is distributed to.
The all of each intelligence control terminal station Real-time Collection access can cutting load circuit and main transformer low-pressure side (being referred to as load cell), and give corresponding intelligence control substation in real time, sort the load cell at each all subordinaties intelligence control terminal station in intelligence control substation according to load importance is unified, the setting range of priority is 0～255, priority is that 1 priority is minimum, priority be 0 do not allow excision, the like.If there is the relation of prepared auto restart each other in transformer station of subordinate in circuit two, the priority of these two circuits is adjusted into same numerical value, if be selected as cut load cell, these two circuits will be excised simultaneously, this with regard to locking the action of backup auto-activating device, to reach the effect of actual excision load.According to above strategy, queue up according to priority orders, cross and cut principle selection excision load with minimum, and send to terminal station by under selection result, carry out the corresponding load of excision by terminal station.So maximum mistake is cut a load circuit, makes the execution of cutting load reach the requirement becoming more meticulous.
Another embodiment that electrical network intelligent and safe of the present invention is stablized early warning and control method is the control of subregion main transformer overload, the control of subregion main transformer overload is mainly by intelligence control substation decision-making and complete, but this function may relate to and Zhi Kong substation, adjacent sectors between cooperation problem, and mutual with Zhi Kong main website.It is existing that details are as follows:
The strategy of subregion main transformer overload control has several as follows:
Cutting load in subregion;
By stages turns for load;
Subregion cyclization is supported;
Intelligent control system possesses above three kinds of policing features, and details are as follows for every kind of tactful specific embodiments:
1) cutting load in subregion:
Main transformer overload exceedes certain limit and reaches certain time-delay and will excise a certain amount of load, need to determine several different overloads and time delay definite value and corresponding cutting load amount in conjunction with the overload capacity of subregion main transformer.
The carrying into execution a plan of cutting load amount is subject to the electric channel overload subregion described in controlling to cut lotus amount with reference to major network to optimize implementation strategy and carry out, guarantee to excise the required lotus amount of cutting accurately, referring to Fig. 3.
2) by stages turns for load:
When subregion main transformer occurs after overload, if being main transformer overload, default allow by stages to turn for load, and intelligence control substation will be sent and turn for load request and required turning for load to Zhi Kong main website, and wherein required turning will be depending on the main transformer overload order of severity for load.
Zhi Kong main website receives a certain intelligence control substation, for example, the intelligence control substation of subregion x, that sends turns for load request, knows that this subregion can turn for load to adjacent those several subregions, and knows the main transformer loading condition of these subregions, Zhi Kong main website will select the lightest subregion of main transformer load as accepting subregion, for example, the intelligence control substation of subregion y, is turning for load back loading rate in the reasonable scope but ensure to accept subregion main transformer simultaneously.After the decision-making of Zhi Kong main website, turn for subregion x and accept to turn for the intelligence control substation of subregion y and send out and allow to turn for load order to request, starting and turn for load.As shown in Figure 4, the step S400 of subregion main transformer overload control comprises that following startup turns the action for load:
S410) if default allows by stages to turn for load, required turning for load calculated according to main transformer overload rate in the intelligence control substation of main transformer overload;
S420) the intelligence control substation Xiang Zhikong main website of main transformer overload sends and turns for load request;
S430) adjacent the turned confession subregion of Zhi Kong main website search, selects the lightest subregion of main transformer load as accepting to turn for subregion;
S440) Zhi Kong main website turns for subregion and accepts to turn the intelligence control substation for subregion to request, sends and allows to turn for load order, starts and turns for load operation.
3) subregion cyclization is supported
When subregion main transformer occurs after overload, if being main transformer overload, default allow cyclization to support, the intelligence control substation of the subregion x of main transformer overload will be sent cyclization to Zhi Kong main website and be supported request, Zhi Kong main website will start cyclization and support decision making function, whether calculate with each may provide cyclization support power, voltage, short circuit current that subregion carries out after cyclization to meet the demands, assess the possibility that cyclization is supported, and select the subregion y of optimum cyclization, start cyclization and support operation.As shown in Figure 5, the step S400 of subregion main transformer overload control comprises the action that following startup cyclization is supported:
S450) if default allows cyclization to support, the intelligence control substation Xiang Zhikong main website of main transformer overload sends cyclization and supports request;
Whether S460) Zhi Kong main website calculates with each may provide cyclization support power, voltage, short circuit current that subregion carries out after cyclization to meet the demands, and assesses the possibility that cyclization is supported, and selects the subregion of optimum cyclization;
S470) Zhi Kong main website supports subregion and the intelligence control substation that provides cyclization to support subregion to request cyclization, sends startup cyclization and supports order, and startup cyclization is supported and operated;
S490) otherwise, overload off-loading control procedure in the boot partition, intelligence control substation of main transformer overload, carries out cutting load operation.
4) three kinds of tactful cooperations
This in three strategy can specify separately and whether come into operation, can permission definite value be set in subregion intelligence control substation, need to carry out decision-making in main website side because turning for load, cyclization support strategy, therefore in main website side, corresponding permission definite value is also set, and three kinds of strategies can arrange priority, according to preferentially, determine the sequencing of decision-making according to priority.
The another kind of embodiment that electrical network intelligent and safe of the present invention is stablized early warning and control method is the control of subregion Voltage Instability: the busbar voltage of each intelligence control substation this subregion of Real-Time Monitoring plant stand, in subregion, each intelligence control terminal station is delivered to this subregion intelligence control substation by our station busbar voltage in real time simultaneously, as shown in Figure 6, the step S500 of subregion Voltage Instability control comprises following action:
S510) busbar voltage that monitors this subregion when intelligence control substation is lower than the first voltage predetermined value u1, and exceed predetermined delay time, main transformer step-down power exceedes power predetermined value simultaneously, judges that quiescent voltage unstability appears in this subregion, boot partition Voltage Instability control operation;
S520) sort to the intelligence control terminal station in this subregion from low to high by voltage in intelligence control substation, rejects the intelligence control terminal station of voltage higher than second voltage predetermined value u2 simultaneously;
S530) order of low-voltage cutting load is sent to each intelligence control terminal station successively according to institute's alignment order in intelligence control substation, controls the highest load cell of intelligence control terminal station excision our station priority;
S540) control after the cutting load success of intelligence control terminal station, intelligence control substation judges whether the busbar voltage of this subregion recovers stable state; If busbar voltage is recovered stable state, finish the control of subregion low-voltage cutting load, otherwise return to step S530, send the order of low-voltage cutting load to the intelligence control terminal station of next one;
S550) if traveled through after all sequences, the busbar voltage of this subregion is not recovered stable state yet, returns to step S520, starts the subregion low-voltage control instability of a new round.
Differentiating voltage predetermined value and the power predetermined value of subregion Voltage Instability can adjust in advance, or utilize the Static Voltage Security analytic function of Zhi Kong main website, calculate dynamically the PV curve of the bus of each subregion load-center substation (plant stand), in the situation that retaining certain nargin, refresh in real time voltage predetermined value and the power predetermined value of each subregion differentiation quiescent voltage unstability.This method combines real-time calculating and adjusts in real time, can accomplish real-time tracking to subregion quiescent voltage unstability, but reliability and accuracy requirement to calculated data is higher.In practical solution, these two kinds of methods can be combined, if the subregion static voltage stability analysis function normal operation of Zhi Kong main website, can reach the subregion static voltage stability predetermined value that practical requirement just can refresh intelligence control substation in real time, otherwise the definite value of adjusting in advance according to self is differentiated in intelligence control substation.In this embodiment, the first voltage predetermined value u1 is 0.92p.u, and second voltage predetermined value u2 is 0.95p.u, and power predetermined value is definite according to the rated power of relevant main transformer, and predetermined delay time is 10s.The busbar voltage that monitors plant stand when intelligence control substation is lower than 0.92p.u, and exceedes 10s, when main transformer step-down power exceedes power predetermined value simultaneously, judges and in this subregion, occurs quiescent voltage unstability; In busbar voltage, higher than second voltage predetermined value 0.95p.u, or busbar voltage is while starting to rise du/dt > 0, judges that this subregion busbar voltage recovers stable state.
The assessment of the running status of intelligent control system to electrical network and the result of control decision, can offer user by visual means intuitively, for example, is subject to the load shedding sensitivity of each subregion of electric channel for certain interchange.Intelligent control system must be realized man-machine interaction with management and running personnel on the other hand, for example after formation control strategy, can offer dispatcher audits, through dispatcher examination & verification by after restart execution, or after amendment optimal conditions, re-started the reasoning and decision-making of steady control means by dispatcher.
Electrical network intelligent and safe according to the present invention is stablized the embodiment of early warning and control method, and step S600 comprises at least one in the following action:
S610) use Power Network Status Estimation result and PQ decomposition algorithm to determine and calculate initial value, utilize Newton-Raphson method to calculate the trend profile data of electrical network;
S620) carry out stability Calculation according to real time data and setting fault collection, adopt the time-domain-simulation algorithm based on element detailed model, determine the transient rotor angle stability nargin of network system;
S630) carry out static voltage security analysis, determine the static voltage stability nargin of current electrical network;
S640) use N-1 criterion to analyze system under N-1 fault and whether keep static voltage stability, if system keeps stable after fault, further calculate the stability margin of system;
S650), by analyzing the sensitivity of nargin index to each control variables, provide prevention and control and strengthen the suggestion of controlling;
S660) according to real time data, electrical network is carried out to transient voltage and frequency safety analysis, provide the error listing that loses transient voltage, frequency stability;
S670) use the method for numerical integration to carry out stability analysis to all fault collection, there is the fault that causes system unstability if find, send stable early warning information, and according to given control principle, determine online and under this malfunction, ensure the required emergency control measure of taking of system stable operation, optimum controlling point and controlled quentity controlled variable are determined in search, generate online and/or Off-line control Policy Table, send on-the-spot stable control device to;
S680) if overhauled by electric channel or loop grid, or electric network fault loss element, cause that electric network state changes, according to the control strategy of up-to-date trend profile data adjustment System, the operating condition that adapts to electrical network changes.
S690) save historical data, utilize the historical data of online data or preservation, carry out Static and dynamic stability off-line analysis.
The embodiment that stablizes early warning and control method according to the electrical network intelligent and safe of the present invention shown in Fig. 1, step S700 comprises the action of following forecast analysis:
S710) obtain generation schedule, maintenance scheduling and bus load prediction data from scheduling EMS system;
The time of S720) specifying in every day, according to generation schedule, maintenance scheduling and bus load prediction data, generate the following operation of the electrical network analogue data of one day 24 hours future or longer time section;
S730) use the following operation of the electrical network analogue data that generates each time point, the static stability of checking system and transient stability;
S740) all result of calculation is generated to operational report on the same day, as the basis of the same day electrical network being dispatched;
S750) utilize bus load prediction data, the operation of power networks stability of following ultra-short term is analyzed, export relevant traffic control suggestion, and potential electrical network unstability fault is sent to early warning information.
Intelligent and safe is stablized early warning and control system can provide the following mode analytic function of the stability of a system based on generation schedule, maintenance scheduling, bus load information of forecasting.Considering that after transaction planning data, this function also can be for the transaction data Security Checking under Power Market.
Under following mode analytical model, intelligent and safe is stablized early warning and control system according to the result that obtains generation schedule, maintenance scheduling, bus load prediction from EMS system, the system possibility operational mode that can extrapolate future time point, the complete trend that then obtains accordingly system distributes.The flow data obtaining offers intelligent and safe and stablizes after early warning and control system, can be for the stability analysis of system, as static electric voltage stability, transient safe and stable, can also be used for the stability margin of computing system, related conclusions can be used for scheduling and the in advance grasp of operational mode personnel to following operational mode.
According to the length of predicted time, load prediction can be divided into mid-term, short-term and ultra-short term prediction.Wherein, ultra-short term prediction is according to the situation of change of the load at setting 15 minutes to 4 hours intervals of predict future 5～60 minutes (adjustable), this part prediction data is not only comparatively accurate, and in the time period of dispatching and the side of fortune personnel are comparatively concerned about, therefore following mode analytic function is strengthened emphatically making full use of this partial data.
Electrical network intelligent and safe according to the present invention is stablized the embodiment of early warning and control method, and described security stabilization early warning and control system, by EMS, on-the-spot PMU device and three sources of on-the-spot stable control device, gather electrical network real time data; And the electrical network real time data collecting from three sources, according to update time and data error, select the most reliable data, for the assessment of Power Network Status Estimation and security and stability.
Except EMS (EMS) data, the data of phase angle monitoring system (PMU) data and on-the-spot stable control device all can be applicable to state estimation.Have the collection model of PMU and stability control equipment plant stand by foundation, intelligent and safe is stablized early warning and control system can be provided and the communication function of phase angle monitoring system and stable control device.Intelligent and safe stablize early warning and control system provide set up the graphical tool of collection model, with phase angle monitoring main website (WAMS) the system communication table of comparisons, with the table of comparisons of communicating by letter of stability control equipment, need safeguard according to PMU device and stability control equipment configuring condition.The equipment with the plant stand of PMU device and stability control equipment will have three data sources, PMU data, stability control device data and EMS metric data.The EMS interface software that EMS metric data is stablized early warning and control system by intelligent and safe sends into data acquisition and supervision (SCADA) system.SCADA selects according to update time and data error the data in three sources, provides a data source the most reliable to offer state estimation and uses, and the handling process of multi-data source as shown in Figure 8.
Intelligent and safe is stablized early warning and control system and is carried out the required key data of analytical calculation and obtain from EMS system.Intelligent and safe stablize early warning and control system can WAMS main website can be directly interconnected, or be indirectly connected by data platform.Under normal conditions, the database interface that On-line stability control system can directly utilize WAMS system or data platform to provide obtains PMU metric data.
Intelligent and safe stablizes early warning and control system is utilized EMS data, stable control device data and PMU data, carries out state estimation, and its major function is:
(1) functional network topology
Functional network topology can be according to electrical network electric component interconnecting relation and current switch tool condition discrimination network wiring mode, is the bus model of application software for XRF analysis establishment network.It can judge the electric island number of current system, electric island equipment composition, the state such as charged whether, and can on figure, show by different colours.
Import to after network library for special format model, can automatically increase connecting valve in equipment end, to facilitate expression equipment running status.
(2) topology Identification function
System can be accepted EMS data and carry out topological analysis, forms network topology.Whether system provides topology Identification function, move according to remote measurement and other equipment state judgment device.Topology Identification function adopts logical approach and data to calculate and combines.Logical approach topology Identification adopts computing equipment operation confidence level target, and moving equipment with a high credibility is operational outfit, confidence level nondeterministic statement equipment and outaged equipment.
Enter topology for equipment with a low credibility and estimate further judgement state.
(3) remote measurement audit function
Can check that whether remote measurement is reasonable according to power-balance principle, comprise active balance, arranged side by side poor, the reactive power equilibrium of busbar voltage etc.Provide time statistics to obvious irrational measurement.
(4) state estimation
State estimation is calculated node voltage and the angle of electrical network according to remote measure and communication, provide a complete operational mode for stability Calculation.State estimation has CASE management function, can preserve integral point or the operation of power networks state of least bit every day.
(5) suspicious data identification
Suspicious data list is provided, and the duration of suspicious data is added up.
Intelligent and safe is stablized early warning and control system according to the principle of setting, and to the EMS system state estimation result data receiving, or oneself state estimation result carries out reliability assessment, to the result data proposition alarm not meeting the demands.Reason and the time of the failure of system log (SYSLOG) data assessment, and send alarm, failure cause comprises that state estimation does not restrain, hinge busbar voltage is defective, interconnection power error is larger etc.Just can be used for the calculating of online decision-making and off-line analysis by the data of assessment.
Those of ordinary skill in the art will be appreciated that; above embodiment is only for technical scheme of the present invention is described; and be not used as limitation of the invention; any variation of the above embodiment being done based on connotation of the present invention, modification, all will drop in the protection range of claim of the present invention.
Claims (5)
1. electrical network intelligent and safe is stablized early warning and a control method, stablizes early warning and control system for electrical network intelligent and safe,
Described security stabilization early warning and control system are obtained powernet data from EMS, it is characterized in that:
Described security stabilization early warning and control system, by Distributed Computing Platform and multi-level subregion control network, realize early warning and the control of electricity net safety stable, described multi-level subregion control network is by Zhi Kong main website, the intelligence control substation of each subregion of Shou Zhikong main website control, and be connected respectively to several intelligence control terminal stations composition of each intelligence control substation;
Described security stabilization early warning and control method comprise the following steps:
S100) described Zhi Kong main website, by EMS, on-the-spot PMU device and three sources of on-the-spot stable control device, obtains electrical network real time data, monitors all load states that are subject to electric channel of current the whole network;
S200) busbar voltage of intelligence control substation this subregion of Real-Time Monitoring of each subregion, each intelligence control terminal station in each subregion, is uploaded to intelligence control substation in real time by the busbar voltage at this intelligence control terminal station;
S300) if monitoring, described Zhi Kong main website transshipped by electric channel, select to be subject to the most serious circuit of overload in electric channel, start and be subject to the control of electric channel overload off-loading, seek minimum cutting load amount according to the sensitivity of eliminating overload, control each relevant intelligence control terminal station by corresponding intelligence control substation, carry out the operation of overload cutting load;
Described overload off-loading control procedure comprises the following steps:
S382) obtain the electric channel overload rate that is subject to;
S384) determine and eliminate the required lotus total amount of cutting of overload;
S386) relatively transship the load shedding sensitivity of alternating current circuit according to each subregion and sort from big to small, distribute and cut lotus amount according to load shedding sensitivity, start to assign cutting load instruction to intelligence control substation from highly sensitive subregion with the power step size of fixing;
S388) described intelligence control substation is by the load cell at each all subordinaties intelligence control terminal station, according to the unified sequence of load importance, queue up according to priority orders, cross and cut principle selection excision load with minimum, and described intelligence control terminal station will be sent under selection result, carry out the corresponding load of excision by described intelligence control terminal station, repetitive cycling is eliminated the required lotus total amount of cutting of overload until meet overload circuit;
S400) if subregion main transformer overload, by boot partition, the intelligence control substation main transformer overload control of this subregion, by relevant intelligence control terminal station in this subregion, carry out the operation of overload cutting load, or, intelligence control substation by Zhi Kong main website and adjacent sectors is mutual, carries out by stages and turns for load or subregion cyclization support operation;
S500) if the busbar voltage that described subregion intelligence control substation monitors this subregion lower than voltage stabilization predetermined value, by boot partition, the intelligence control substation Voltage Instability control of this subregion, by each relevant intelligence control terminal station in this subregion, carry out the operation of subregion low-voltage cutting load;
S600) information that upload the electrical network real time data that Zhi Kong main website comprehensively obtains and each substation, form in real time the trend profile data of current electrical network, the operational mode of identification electrical network, the reliability to data and electric network state and electricity net safety stable carry out online evaluation; The electrical network real time data that described security stabilization early warning and control system collect from described three sources, according to update time and data error, select the most reliable data, for the assessment of Power Network Status Estimation and security and stability; To the EMS system state estimation result data receiving, or the state estimation result of oneself carries out reliability assessment, and the result data not meeting the demands is proposed to alarm; And according to by the data of assessment, carry out the calculating of on-line decision, On-line Control and off-line analysis;
S700) according to obtaining generation schedule, maintenance scheduling and bus load prediction data from EMS dispatching patcher, electrical network is carried out to sunykatuib analysis to the operation of power networks stability of following ultra-short term, export relevant traffic control suggestion, and potential electrical network unstability fault is sent to early warning information, this step comprises following action:
S710) obtain generation schedule, maintenance scheduling and bus load prediction data from EMS dispatching patcher;
The time of S720) specifying in every day, according to generation schedule, maintenance scheduling and bus load prediction data, generate the following operation of the electrical network analogue data of one day 24 hours future or longer time section;
S730) use the following operation of the electrical network analogue data that generates each time point, static stability and the transient stability of inspection network system;
S740) all result of calculation is generated to operational report on the same day, as the basis of the same day electrical network being dispatched;
S750) utilize bus load prediction data, the operation of power networks stability of following ultra-short term is analyzed, export relevant traffic control suggestion, and potential electrical network unstability fault is sent to early warning information.
2. electrical network intelligent and safe according to claim 1 is stablized early warning and control method, it is characterized in that described step S300 comprises following action:
S320) be subject to electric channel overload according to circuit overload rate and the judgement of overload delay time;
S340) select to be subject to transship the most serious circuit as controlling target in electric channel;
S360) Real-time Obtaining is subject to the network equivalence profile data of electric channel;
S380), to electing the circuit of controlling target as, start overload off-loading control procedure.
3. electrical network intelligent and safe according to claim 1 is stablized early warning and control method, it is characterized in that described step S400 comprises following action:
S410) allow by stages to turn for load if described security stabilization early warning and control system are set, required turning for load calculated according to main transformer overload rate in the intelligence control substation of main transformer overload;
S420) the intelligence control substation Xiang Zhikong main website of main transformer overload sends and turns for load request;
S430) adjacent the turned confession subregion of Zhi Kong main website search, selects the lightest subregion of main transformer load as accepting to turn for subregion;
S440) Zhi Kong main website turns for subregion and accepts to turn the intelligence control substation for subregion to request, sends and allows to turn for load order, starts and turns for load operation;
S450) allow cyclization to support if described security stabilization early warning and control system are set, the intelligence control substation Xiang Zhikong main website of main transformer overload sends cyclization and supports request;
Whether S460) Zhi Kong main website calculates with each may provide cyclization support power, voltage, short circuit current that subregion carries out after cyclization to meet the demands, and assesses the possibility that cyclization is supported, and selects the subregion of optimum cyclization;
S470) Zhi Kong main website supports subregion and the intelligence control substation that provides cyclization to support subregion to request cyclization, sends startup cyclization and supports order, and startup cyclization is supported and operated;
S490) otherwise, overload off-loading control procedure in the boot partition, intelligence control substation of main transformer overload, carries out cutting load operation.
4. electrical network intelligent and safe according to claim 1 is stablized early warning and control method, it is characterized in that described step S500 comprises following action:
S510) busbar voltage that monitors this subregion when intelligence control substation is lower than the first voltage predetermined value, and exceed predetermined delay time, main transformer step-down power exceedes power predetermined value simultaneously, judges that quiescent voltage unstability appears in this subregion, boot partition Voltage Instability control operation;
S520) sort to the intelligence control terminal station in this subregion from low to high by busbar voltage in intelligence control substation, rejects the intelligence control terminal station of busbar voltage higher than second voltage predetermined value simultaneously;
S530) order of low-voltage cutting load is sent to each intelligence control terminal station successively according to institute's alignment order in intelligence control substation, controls the highest load cell of intelligence control terminal station excision our station priority;
S540) control after the cutting load success of intelligence control terminal station, intelligence control substation judges whether the busbar voltage of this subregion recovers stable state; If busbar voltage is recovered stable state, finish the control of subregion low-voltage cutting load; Otherwise return to step
S530, sends the order of low-voltage cutting load to the intelligence control terminal station of next one;
S550) if traveled through after all sequences, the busbar voltage of this subregion is not recovered stable state yet, returns to step S520, starts the subregion low-voltage control instability of a new round.
5. electrical network intelligent and safe according to claim 1 is stablized early warning and control method, it is characterized in that described step S600 comprises at least one in the following action:
S610) use Power Network Status Estimation result and PQ decomposition algorithm to determine and calculate initial value, utilize Newton-Raphson method to calculate the trend profile data of electrical network;
S620) automatically carry out stability Calculation according to real time data and setting fault collection, adopt the time-domain-simulation algorithm based on element detailed model, determine the transient rotor angle stability nargin of network system;
S630) carry out static voltage security analysis, determine the static voltage stability nargin of current electrical network;
S640) use N-1 criterion to analyze network system under N-1 fault and whether keep static voltage stability, if network system keeps stable after fault, further calculate the stability margin of network system;
S650), by analyzing the sensitivity of nargin index to each control variables, provide prevention and control and strengthen the suggestion of controlling;
S660) according to real time data, electrical network is carried out to transient voltage and frequency safety analysis, provide the error listing that loses transient voltage, frequency stability;
S670) use the method for numerical integration to carry out stability analysis to all fault collection, there is the fault that causes network system unstability if find, send stable early warning information, and according to given control principle, determine online and under this malfunction, ensure the required emergency control measure of taking of network system stable operation, optimum controlling point and controlled quentity controlled variable are determined in search, generate online and/or Off-line control Policy Table, send on-the-spot stable control device to;
S680) if overhauled by electric channel or loop grid, or electric network fault loss element, cause that electric network state changes, adjust the control strategy of network system according to up-to-date trend profile data, the operating condition that adapts to electrical network changes;
S690) save historical data, utilize the historical data of online data or preservation, carry out Static and dynamic stability off-line analysis.
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