CN105610157B - A kind of area power grid static security analysis system of failure driving - Google Patents
A kind of area power grid static security analysis system of failure driving Download PDFInfo
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
Whether, the invention discloses a kind of area power grid static security analysis system of failure driving, its On-line Fault analyzing subsystem downloads the warning information that main website collects, analyze and broken down in operation of power networks；Collect all（It is doubtful）Faulty equipment and change bit switch, faulty equipment list and displacement switch list are formed, as startup event, static security analysis subsystem is passed to by far call；Static security analysis subsystem analysis calculates starts Risk Calculation subsystem by far call；Risk Calculation subsystem starts calculating process, calculates power network present risk value；Man-machine interface shows result, including faulty equipment, trip switch, correlation protection action message, overload prevention device, the bus of voltage out-of-limit and power grid risk value；The present invention scores for electric network security, assesses power network current safety grade, reduces the scope and number of calculating, greatly reduce calculating pressure, substantially increase the engineering practicability of static security analysis system.
Description
Technical field：
The present invention relates to a kind of area power grid static security analysis system of failure driving, belong to Automation of Electric Systems skill
Art field, suitable for area power grid intelligent control main website, intelligent Ji Kong main websites and intelligent allocation integration main website, it is also applied for having
The intelligent power distribution main website of standby condition（Hereinafter referred to as " main website "）.
Background technology：
Contingency Analysis of Power Systems is to after systematic failures referred to as " N-1 scannings "（Or after forecast accident occurs）Electricity
The steady-state operation situation of net is analyzed（Such as the security and margin of safety of generator, line disconnection post analysis power network）.Engineering
Using when, often to operating state power network in real time（Or the power network under a certain research state）, it is first one by one according to N-1 principles, research
After part is out of service, if other elements overload and node voltage can be caused out-of-limit, and for it is some of it is out-of-limit, overload that provide can
Selective adjustable strategies.
Early stage static security analysis more using AC power flow and DC power flow come decision-making system security, but as power network is advised
Mould expands, and its practicality receives huge challenge.In recent years, two key points of static security analysis research were how to reduce to treat
Analysis（Anticipation）Accident Number and the speed for how accelerating analysis calculating.
At present, the static security analysis system in engineer applied, there are artificial triggering, cycle triggering and event triggering etc. several
Starting mode.Artificial triggering is to start the triggering analysis of static security analysis software by operations staff, and this is the triggering used earliest
Mode.Opportunity for manually triggering relies on the experience of operations staff, when triggers, triggers under the conditions of which kind of, it is difficult to hold, therefore
When power network occurs abnormal, it is likely that miss the analysis time of most worthy, it is difficult to find the weak link of system in time.Cycle touches
Hair is to utilize timer, sets a time cycle（Such as 15 minutes）, time is up once analyzes with regard to triggering.Cycle triggering can
To mitigate the pressure of operations staff, but still the analysis time of most worthy may be missed, can not ensure timely to find system
Weak link.To solve the deficiency of artificial triggering, cycle triggering, event triggering is arisen at the historic moment.Event triggering is periodically to catch
The switch changed position information in system is caught, using switch changed position all in power network in a timeslice as an event, to trigger
Analysis.Currently, network system is on a grand scale, and switch changed position is more and frequent in system, runs the service of static security analysis system
Device calculating pressure is very big, therefore scene is typically not provided with " event-driven ", and its practical level is very limited.
Which kind of in addition, no matter triggered using mode, the result that N-1 scanning analysis are calculated, the exhibition more in a manner of list
Show, person on duty is difficult to grasp all list informations rapidly, lacks the concept of a quantization to the security of current electric grid.
The content of the invention：
One kind is provided by electric network fault equipment and association it is an object of the invention to overcome the shortcomings of above-mentioned prior art
Become bit switch and be used as event, to drive static security analysis system to complete quick analysis calculating, and the method for introducing risk assessment,
Scored for electric network security, assess power network current safety grade, reduce the scope and number of calculating, greatly reduce operation
The calculating pressure of static security analysis system server, substantially increase the failure of the engineering practicability of static security analysis system
The area power grid static security analysis system of driving.
The purpose of the present invention can be reached by following measure：A kind of area power grid static security analysis of failure driving
System, it is characterised in that it is made up of On-line Fault analyzing subsystem, static security analysis subsystem and Risk Calculation subsystem；
（1）On-line Fault analyzing subsystem downloads the warning information that collects of main website, analysis obtain in operation of power networks there occurs
Failure；
（2）The analysis of On-line Fault analyzing subsystem is out of order, and collects all faulty equipments or suspected malfunctions equipment and change
Bit switch, faulty equipment list and displacement switch list are formed, as the event of startup, static security is passed to by far call
Analyzing subsystem；
（3）Static security analysis subsystem starts, and starts analysis and calculates；
（4）Static security analysis subsystem, which calculates, to be terminated, and by far call, starts Risk Calculation subsystem；
（5）Risk Calculation subsystem starts calculating process, calculates power network present risk value；
（6）Man-machine interface show result, including faulty equipment, trip switch, correlation protection action message, overload prevention device,
The bus and power grid risk value of voltage out-of-limit；
（7）On-line Fault analyzing subsystem continues to download the warning information that main website collects, and analysis is obtained in operation of power networks not
Break down, do not start（2）、（3）、（4）、（5）、（6）Processing；
（8）Whether On-line Fault analyzing subsystem continues to download the warning information that main website collects, analyze and sent out in operation of power networks
Raw failure, it is faulty, start（2）、（3）、（4）、（5）、（6）Processing；Fault-free, press（7）Processing.
In order to further realize the purpose of the present invention, described On-line Fault analyzing subsystem downloads various alarms from main website
Information, first filtering maintenance, debug, warning information caused by cold standby equipment, then detect relevant with electric network fault in warning information
Protection information and switch changed position information, judge grid collapses, and by preset " protection --- equipment " incidence relation,
It is aided with topological analysis, judges faulty equipment or suspected malfunctions equipment, then collects the change bit switch of correlation, generation faulty equipment row
Table, displacement switch list, using them as startup event, pass to static security analysis subsystem by far call, drive
Static security analysis subsystem is calculated；Meanwhile fault message is sent to alarm and shows boundary by On-line Fault analyzing subsystem
Face；
Described On-line Fault analyzing subsystem calling appraisal of equipment, the fault history of appraisal of equipment bonding apparatus,
Equipment one " normal ", " attention ", the state of "abnormal" or " urgent " are given, and updates equipment information database；Facility information
The state of equipment or the artificial mark of inserting of releasing are modified by " state is inserted " in database；The state inserted, which has, " stops
With ", " cold standby ", " maintenance ", four kinds of " debugging "；" deactivation ", " cold standby ", " maintenance ", the equipment of " debugging " are inserted, is not involved in
Risk Calculation；
Described static security analysis subsystem is started analysis and calculated using faulty equipment list and displacement switch list, meter
Calculate result and be transported to the out-of-limit showing interface of overload；
Described static security analysis subsystem calls breakdown loss to calculate, and calculates the reality in the case of power network current failure
Breakdown loss, out-of-limit, the overload percentage of current operational outfit, then update equipment information database；Power network is normally transported again
Capable equipment, according to N-1 principles, breakdown loss calculating is carried out, calculate the loss of the forecast failure after each equipment forecast failure, mistake
Percentage, out-of-limit percentage are carried, is saved in equipment information database；
Described static security analysis subsystem calls appraisal of equipment, and appraisal of equipment bonding apparatus is out-of-limit, the history of overload
Record, equipment one " normal ", " attention ", the state of "abnormal" or " urgent " are given, and update equipment information database；If therefore
Barrier analyzing subsystem and static security analysis subsystem make different evaluation to the state of same equipment, take the state that consequence is serious
It is defined；Static security analysis subsystem is completed analysis and calculated, and starts Risk Calculation by remote procedure call；
Described Risk Calculation subsystem risk defines instrument and is used for defining equipment failure rate, power grid risk etc.
Level, risk class deduction of points value, breakdown loss deduction of points value, apparatus overload deduction of points value, equipment voltage out-of-limit deduction of points value；
The span of described equipment failure rate is（0,1）；
Described power grid risk grade is set to VI, V, IV, III, II, I 6 rank, I level risk highests；Each risk etc.
The corresponding risk class deduction of points value of level, risk class deduction of points value is a score range；
Described breakdown loss has two kinds, and one kind is physical fault loss, and one kind is forecast failure loss, and its deduction of points value is all
It is comprehensive loss load, customer interrupted number, a deduction of points value corresponding to customer interrupted grade；
Described apparatus overload deduction of points value is
1）For 35kV/110kV/220kV/500kV circuit overloads deduction of points value is defined according to overload percentage；
2）For 35kV/110kV/220kV main transformer overloads deduction of points value is defined according to overload percentage；
Described equipment voltage out-of-limit deduction of points value be for 10kV/35kV/110kV/220kV buses it is out-of-limit according to out-of-limit percentage
Than defining deduction of points value；
All information that risk defines instrument definition are saved in risk and defined in file；
Reading risk defines the information in file when described Risk Calculation subsystem starts, when Risk Calculation subsystem connects
The computations of static security analysis subsystem is received, is read in slave unit information database：
（1）Power network physical fault is lost；
（2）The state of operational outfit, failure overload in power network/out-of-limit percentage, forecast failure loss, anticipation overload/are got over
Limit percentage；
After reading above- mentioned information, Risk Calculation subsystem is calculated：
1）Lost by power network physical fault, deduction of points value 1 is calculated；
2）Grid operation equipment is traveled through, calculates its failure overload, the out-of-limit deduction of points value of failure, computational methods are：
（Anticipation overload deduction of points is worth+envisioned voltage out-of-limit deduction of points value）× failure rate；
3）Detection 2）Middle deduction of points value highest equipment, and its deduction of points value is designated as deduction of points value 2；
4）The deduction of points value that forecast failure occurs for each operational outfit is calculated, computational methods are：
（Breakdown loss deduction of points value+anticipation overload deduction of points is worth+envisions voltage out-of-limit deduction of points value）× failure rate；
5）Detection 4）After middle generation forecast failure, deduction of points value highest equipment, and its deduction of points value is designated as deduction of points value 3；
6）Deduction of points value 1+ deduction of points value 2+ deduction of points value 3=total penalties values；
7）With 6）In total penalties value go match power grid risk grade score range；
The risk class of current electric grid is output to risk displaying interface.
The present invention can produce following good effect compared with the prior art：The present invention develops a kind of failure for area power grid and driven
Dynamic static security analysis system, when being broken down in power network, by faulty equipment with associate become bit switch as event, to drive
Dynamic system is completed quick analysis and calculated, it is ensured that catches the analysis time of most worthy, prompts the weak link of power network in time；Introduce
Methods of risk assessment, the security to power network score, assess electric network security grade, allow operations staff's moment to electric network security
There is the concept of quantization, so as to improve the safety operation level of power network；Due to faulty equipment with associate displacement number of switches be much smaller than
The number of switch changed position in conventional event triggering, the scope and number of calculating are reduced, greatly reduces operation static security point
The calculating pressure of analysis system server, substantially increase the engineering practicability of static security analysis system.
Brief description of the drawings：
Fig. 1 is the overall plan schematic diagram of the present invention；
Fig. 2 is specific embodiments of the present invention schematic diagram.
Embodiment：
The embodiment of the present invention is elaborated below in conjunction with the accompanying drawings：
Embodiment：A kind of area power grid static security analysis system of failure driving（Referring to Fig. 1）, it is by On-line Fault point
Analysing subsystem, static security analysis subsystem and Risk Calculation subsystem, altogether 3 subsystems are formed；Its workflow is as follows：
（1）On-line Fault analyzing subsystem downloads the warning information that collects of main website, analysis obtain in operation of power networks there occurs
Failure；
（2）The analysis of On-line Fault analyzing subsystem is out of order, and collects all faulty equipments or suspected malfunctions equipment and change
Bit switch, faulty equipment list and displacement switch list are formed, as the event of startup, static security is passed to by far call
Analyzing subsystem；
（3）Static security analysis subsystem starts, and starts analysis and calculates；
（4）Static security analysis subsystem, which calculates, to be terminated, and by far call, starts Risk Calculation subsystem；
（5）Risk Calculation subsystem starts calculating process, calculates power network present risk value；
（6）Man-machine interface show result, including faulty equipment, trip switch, correlation protection action message, overload prevention device,
The bus and power grid risk value of voltage out-of-limit；
（7）On-line Fault analyzing subsystem continues to download the warning information that main website collects, and analysis is obtained in operation of power networks not
Break down, do not start（2）、（3）、（4）、（5）、（6）Processing；
（8）Whether On-line Fault analyzing subsystem continues to download the warning information that main website collects, analyze and sent out in operation of power networks
Raw failure, it is faulty, start（2）、（3）、（4）、（5）、（6）Processing；Fault-free, press（7）Processing.
Wherein（Referring to Fig. 2）,
1st, On-line Fault analyzing subsystem
On-line Fault analyzing subsystem downloads various warning information from main website, first filtering maintenance, debugging, the production of cold standby equipment
Raw warning information, then detect protection information relevant with electric network fault in warning information（Including accident is total, protection exit, again
Combined floodgate, prepared auto restart and voltage to frequency control action information）With switch changed position information, grid collapses are judged, and by preset
" protect --- equipment " incidence relation, it is aided with topological analysis, judges faulty equipment（Or suspected malfunctions equipment）, then collect correlation
Change bit switch, generation faulty equipment list, displacement switch list, using them as startup event, pass through far call transmission
Static security analysis subsystem is given, driving static security analysis subsystem is calculated；Meanwhile On-line Fault analyzing subsystem will
Fault message is sent to alarm display interface, for operations staff's reference, confirms.
On-line Fault analyzing subsystem calls appraisal of equipment, the fault history of appraisal of equipment bonding apparatus, gives and sets
The state of standby one " normal ", " attention ", "abnormal" or " urgent "（The order of severity raises from front to back）, and update facility information
Database.
The original state of each equipment in equipment information database, is imported from the area of safety III, and IIIth area is each safely sets
Standby state, it is that electric company carries out the conclusion that equipment evaluation work is drawn.The state of equipment in equipment information database（Or solution
Except manually inserting mark）Modified by " state is inserted ".
Operations staff uses the state of an equipment in " state is inserted " modification status information of equipment database（Or release people
Work inserts mark）, the state inserted has " deactivation ", " cold standby ", " maintenance ", four kinds of " debugging ".Insert the state of an equipment
Afterwards, stamped in status information of equipment database to this equipment and insert mark.On-line Fault analyzing subsystem（It is and described below
Static security analysis subsystem）The state of insertion apparatus can not be updated, unless operations staff uses " state is inserted " to relieve
It inserts mark.
" deactivation ", " cold standby ", " maintenance ", the equipment of " debugging " are inserted, is not involved in Risk Calculation.
2nd, static security analysis subsystem
Static security analysis subsystem uses startup event（That is faulty equipment list and displacement switch list）, start analysis
Calculate, result of calculation（Overload, more limit information）The out-of-limit showing interface of overload is transported to, is referred to for operations staff.
Static security analysis subsystem calls breakdown loss to calculate, and calculates the physical fault damage in the case of power network current failure
Lose（Lose load, customer interrupted number, customer interrupted grade）, out-of-limit, the overload percentage of current operational outfit, then update and set
Standby information database；Again by the equipment of power network normal operation, according to N-1 principles, breakdown loss calculating is carried out, calculates each equipment
Forecast failure loss after forecast failure（Lose load, customer interrupted number, customer interrupted grade）, overload percentage, out-of-limit hundred
Divide ratio, be saved in equipment information database.
Static security analysis subsystem calls appraisal of equipment, and appraisal of equipment bonding apparatus is out-of-limit, the historical record of overload, gives
Equipment one " normal ", " attention ", the state of "abnormal" or " urgent " are given, and updates equipment information database.If accident analysis
Subsystem and static security analysis subsystem make different evaluation to the state of same equipment, and the state for taking consequence serious is defined.
Static security analysis subsystem is completed analysis and calculated, and starts Risk Calculation by remote procedure call.
3rd, Risk Calculation subsystem
Risk defines instrument and is used for defining equipment failure rate, power grid risk grade, risk class deduction of points value, failure damage
Lose deduction of points value, apparatus overload deduction of points value, equipment voltage out-of-limit deduction of points value.
The span of equipment failure rate is（0,1）.When defining equipment failure rate, equipment state, electricity are considered
3 grade, device type key elements are pressed, such as：When 110kV line status is " attention ", failure rate is set to 0.1, and state is
Failure rate is set to 0.3 during "abnormal"；Failure rate is set to 0.3 when 10kV line status is " attention ", and state is " different
Failure rate is set to 0.5 when often ".Equipment failure rate is empirical value, dependent on historical statistical data and operations staff
Experience is, it is necessary to constantly amendment in the application.
Power grid risk grade is set to VI, V, IV, III, II, I 6 rank, I level risk highests.
The corresponding risk class deduction of points value of each risk class, risk class deduction of points value are a score ranges, such as I
Deduction of points value >=1000 corresponding to level.
Breakdown loss has two kinds, and one kind is physical fault loss, and one kind is forecast failure loss, and its deduction of points value is all comprehensive
Lose load, customer interrupted number, a deduction of points value corresponding to customer interrupted grade.
Apparatus overload deduction of points value is
（1）For 35kV/110kV/220kV/500kV circuit overloads deduction of points value is defined according to overload percentage；
（2）For 35kV/110kV/220kV main transformer overloads deduction of points value is defined according to overload percentage.
Equipment voltage out-of-limit deduction of points value is to be defined for 10kV/35kV/110kV/220kV buses are out-of-limit according to out-of-limit percentage
Deduction of points value.
All information that risk defines instrument definition are saved in risk and defined in file.
Risk is read when Risk Calculation subsystem starts and defines information in file, when Risk Calculation subsystem receive it is quiet
The computations of state safety analysis subsystem, read in slave unit information database：
（1）Power network physical fault is lost；
（2）The state of operational outfit, failure overload in power network/out-of-limit percentage, forecast failure loss, anticipation overload/are got over
Limit percentage；
After reading above- mentioned information, Risk Calculation subsystem is calculated：
1）Lost by power network physical fault, deduction of points value 1 is calculated；
2）Grid operation equipment is traveled through, calculates its failure overload, the out-of-limit deduction of points value of failure, computational methods are：
（Anticipation overload deduction of points is worth+envisioned voltage out-of-limit deduction of points value）× failure rate；
3）Detection 2）Middle deduction of points value highest equipment, and its deduction of points value is designated as deduction of points value 2；
4）The deduction of points value that forecast failure occurs for each operational outfit is calculated, computational methods are：
（Breakdown loss deduction of points value+anticipation overload deduction of points is worth+envisions voltage out-of-limit deduction of points value）× failure rate；
5）Detection 4）After middle generation forecast failure, deduction of points value highest equipment, and its deduction of points value is designated as deduction of points value 3；
6）Deduction of points value 1+ deduction of points value 2+ deduction of points value 3=total penalties values；
7）With 6）In total penalties value go match power grid risk grade score range；
The risk class of current electric grid be output to risk displaying interface, for operations staff refer to, and can have access to deduction of points value,
Deduction of points item.
The embodiment of the present invention is only used for that the present invention is further illustrated, not exhaustive, does not form to claim
The restriction of protection domain, the enlightenment that those skilled in the art obtain according to embodiments of the present invention, without creative work with regard to energy
Enough expect other substantially equivalent replacements, all fall in the scope of protection of the present invention.
Claims (1)
1. a kind of area power grid static security analysis system of failure driving, it is characterised in that it analyzes subsystem by On-line Fault
System, static security analysis subsystem and Risk Calculation subsystem are formed；
（1）On-line Fault analyzing subsystem downloads the warning information that collects of main website, and analysis obtains in operation of power networks that there occurs failure；
（2）The analysis of On-line Fault analyzing subsystem is out of order, and collects all faulty equipments or suspected malfunctions equipment and displacement is opened
Close, form faulty equipment list and displacement switch list, as the event of startup, static security analysis is passed to by far call
Subsystem；
（3）Static security analysis subsystem starts, and starts analysis and calculates；
（4）Static security analysis subsystem, which calculates, to be terminated, and by far call, starts Risk Calculation subsystem；
（5）Risk Calculation subsystem starts calculating process, calculates power network present risk value；
（6）Man-machine interface shows result, including faulty equipment, trip switch, correlation protection action message, overload prevention device, voltage
Out-of-limit bus and power grid risk value；
（7）On-line Fault analyzing subsystem continues to download the warning information that main website collects, and analysis obtains not occurring in operation of power networks
Failure, do not start（2）、（3）、（4）、（5）、（6）Processing；
（8）On-line Fault analyzing subsystem continues to download the warning information that main website collects, and analyzes in operation of power networks event whether occurs
Barrier, it is faulty, start（2）、（3）、（4）、（5）、（6）Processing；Fault-free, press（7）Processing；
Described On-line Fault analyzing subsystem downloads various warning information from main website, first filtering maintenance, debugging, cold standby equipment
Caused warning information, then protection information relevant with electric network fault in warning information and switch changed position information are detected, judge electricity
Net breaks down, and by preset " protection --- equipment " incidence relation, is aided with topological analysis, judges faulty equipment or doubtful
Faulty equipment, then collect the change bit switch of correlation, the list of generation faulty equipment, displacement switch list, using them as startup thing
Part, static security analysis subsystem is passed to by far call, driving static security analysis subsystem is calculated；Meanwhile
Fault message is sent to alarm display interface by On-line Fault analyzing subsystem；
Described On-line Fault analyzing subsystem calls appraisal of equipment, the fault history of appraisal of equipment bonding apparatus, gives
Equipment one " normal ", " attention ", the state of "abnormal" or " urgent ", and update equipment information database；Facility information data
The state of equipment or the artificial mark of inserting of releasing are modified by " state is inserted " in storehouse；The state inserted has " deactivation ", " cold
It is standby ", " maintenance ", four kinds of " debugging "；" deactivation ", " cold standby ", " maintenance ", the equipment of " debugging " are inserted, is not involved in risk meter
Calculate；
Described static security analysis subsystem is started analysis and calculated using faulty equipment list and displacement switch list, calculates knot
Fruit is transported to the out-of-limit showing interface of overload；
Described static security analysis subsystem calls breakdown loss to calculate, and calculates the physical fault in the case of power network current failure
Loss, out-of-limit, the overload percentage of current operational outfit, then update equipment information database；Again by power network normal operation
Equipment, according to N-1 principles, breakdown loss calculating is carried out, calculate the loss of the forecast failure after each equipment forecast failure, overload hundred
Point than, out-of-limit percentage, equipment information database is saved in；
Described static security analysis subsystem calls appraisal of equipment, and appraisal of equipment bonding apparatus is out-of-limit, the historical record of overload,
Equipment one " normal ", " attention ", the state of "abnormal" or " urgent " are given, and updates equipment information database；If failure point
Analysis subsystem and static security analysis subsystem make different evaluation to the state of same equipment, and the state for taking consequence serious is
It is accurate；Static security analysis subsystem is completed analysis and calculated, and starts Risk Calculation by remote procedure call；
Described Risk Calculation subsystem risk defines instrument and is used for defining equipment failure rate, power grid risk grade, wind
Dangerous grade deduction of points value, breakdown loss deduction of points value, apparatus overload deduction of points value, equipment voltage out-of-limit deduction of points value；
The span of described equipment failure rate is（0,1）；
Described power grid risk grade is set to VI, V, IV, III, II, I 6 rank, I level risk highests；Each risk class pair
A risk class deduction of points value is answered, risk class deduction of points value is a score range；
Described breakdown loss has two kinds, and one kind is physical fault loss, and one kind is forecast failure loss, and its deduction of points value is all comprehensive
Close loss load, customer interrupted number, a deduction of points value corresponding to customer interrupted grade；
Described apparatus overload deduction of points value is
For 35kV/110kV/220kV/500kV circuit overloads deduction of points value is defined according to overload percentage；
For 35kV/110kV/220kV main transformer overloads deduction of points value is defined according to overload percentage；
Described equipment voltage out-of-limit deduction of points value is to determine for 10kV/35kV/110kV/220kV buses are out-of-limit according to out-of-limit percentage
Adopted deduction of points value；
All information that risk defines instrument definition are saved in risk and defined in file；
Reading risk defines the information in file when described Risk Calculation subsystem starts, when Risk Calculation subsystem receives
The computations of static security analysis subsystem, read in slave unit information database：
Power network physical fault is lost；
The state of operational outfit, failure overload/out-of-limit percentage, forecast failure loss, anticipation overload/out-of-limit percentage in power network
Than；
After reading above- mentioned information, Risk Calculation subsystem is calculated as follows：
1）Lost by power network physical fault, deduction of points value 1 is calculated；
2）Grid operation equipment is traveled through, calculates its failure overload, the out-of-limit deduction of points value of failure, computational methods are：
（Anticipation overload deduction of points is worth+envisioned voltage out-of-limit deduction of points value）× failure rate；
3）Detect above-mentioned 2）Middle deduction of points value highest equipment, and its deduction of points value is designated as deduction of points value 2；
4）The deduction of points value that forecast failure occurs for each operational outfit is calculated, computational methods are：
（Breakdown loss deduction of points value+anticipation overload deduction of points is worth+envisions voltage out-of-limit deduction of points value）× failure rate；
5）Detect above-mentioned 4）After middle generation forecast failure, deduction of points value highest equipment, and its deduction of points value is designated as deduction of points value 3；
6）Deduction of points value 1+ deduction of points value 2+ deduction of points value 3=total penalties values；
7）With above-mentioned 6）In total penalties value go match power grid risk grade score range；
The risk class of current electric grid is output to risk displaying interface.
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