CN105958480B - A kind of electric-gas coupling multipotency streaming system joint static security analysis method - Google Patents
A kind of electric-gas coupling multipotency streaming system joint static security analysis method Download PDFInfo
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- CN105958480B CN105958480B CN201610364719.2A CN201610364719A CN105958480B CN 105958480 B CN105958480 B CN 105958480B CN 201610364719 A CN201610364719 A CN 201610364719A CN 105958480 B CN105958480 B CN 105958480B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q10/00—Administration; Management
- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0635—Risk analysis of enterprise or organisation activities
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
- G06Q50/06—Electricity, gas or water supply
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Abstract
The present invention relates to a kind of joint static security analysis methods of sharp electrical couplings multipotency streaming system, belong to operation and the control technology field of the form containing various energy resources.This method breaks through security analysis of electric power system and only considers the limitation of power grid in itself, consider influencing each other for supply of electric power and natural gas supply, realize the joint static security analysis of electrical couplings multipotency streaming system, so as to analyze influence of the various possible forecast accidents to two systems in supply of electric power and natural gas supply simultaneously, compared to the existing method for carrying out individual secure analysis to power supply and natural gas supply respectively, the accuracy of safety analysis is improved, reduce erroneous judgement and is failed to judge.This method can be applied in the on-line operation of electrical couplings multipotency streaming system, it works in electrical couplings multipotency stream energy management, when system when safety problem or potential risk there are safety warning is provided, the safety of electrical couplings multipotency streaming system operation is helped to improve.
Description
Technical field
The present invention relates to a kind of electric-gas coupling multipotency streaming system joint static security analysis methods, belong to containing various energy resources
The Operation of Electric Systems and control technology field of form.
Background technology
Comprehensive utilization of energy is the important channel improved comprehensive energy utilization ratio, promote regenerative resource consumption, is passed through
The opposite state isolated of subsystem can be flowed by breaking original electric, hot, cold, gas, traffic etc., realize polymorphic type energy opening and interconnecting, structure
Build multipotency streaming system.Multipotency stream refers to a plurality of types of energy streams, represents the phase mutual coupling of the energy streams such as electric, hot, cold, gas, traffic
It closes, convert and transmits.Compared to the energy resource system that tradition is mutually isolated, the benefit brought includes multipotency streaming system：1) by more
The cascade development utilization of the type energy and intelligent management can reduce energy consumption and waste, improve comprehensive energy utilization ratio,
And the use for helping to reduce always can cost；2) it using the property difference of different energy sources and complementary, conversion, helps to improve between consumption
The ability of formula of having a rest regenerative resource；3) confession, complementary and coordination control are turned by multiple-energy-source, helps to improve the reliable of energy supply
Property, and the operation for power grid provides more controllable resources；4) collaborative planning by multipotency streaming system and construction, it is possible to reduce
The repeated construction and waste of infrastructure improve asset utilization ratio.
On the one hand multipotency streaming system has considerable benefit, on the other hand also make originally complicated energy resource system more multiple
It is miscellaneous.Multipotency streaming system is made of multiple subsystems that can flow, these can flow interaction and influence between subsystem so that multipotency stream
System complexity dramatically increases, and embodies many new characteristics, and each method that can flow independent analysis of tradition has been difficult in adapt to
New requirement, there is an urgent need for develop new multipotency stream analysis method.In China, the couplings such as more and more gas turbines, electric hydrogen manufacturing
Element objectively enhances the interconnection between electric-gas, promotes the development of electric-gas coupling multipotency streaming system, also electric-gas is coupled
The operation control and energy management of multipotency streaming system propose new requirement.
Safety is the basis of multipotency streaming system normal operation, and with the complication of system, the safety problem of multipotency stream is also more
Add protrusion.Multipotency streaming system can be influenced in the process of running by various disturbances, become including element fault, power generation (such as wind-powered electricity generation)
Change, load variations etc..It, still can be with continuous transmission energy in the case where the overwhelming majority disturbs in order to ensure the safe operation of multipotency streaming system
Amount needs to carry out safety analysis to the operating status of system.Safety analysis is one of Core Feature of energy management, can be online
It was found that the weak link in multipotency streaming system real time execution, helps to improve the level of security that multipotency streaming system is run.It is existing
Safety analysis technique is concentrated mainly in electric system, is not yet expanded in multipotency streaming system, and electric-gas there is no to couple multipotency at present
The method of streaming system static security analysis.Therefore, it is necessary to study electric-gas coupling multipotency streaming system static security analysis method.
Invention content
The purpose of the present invention is to propose to a kind of electric-gas to couple multipotency streaming system static security analysis method, considers that electric power supplies
It should influence each other and various possible forecast accidents with natural gas supply, establish electric-gas coupling multipotency streaming system static security
The frame and method of analysis realize the joint static security analysis of electric-gas coupling multipotency streaming system.
Electric-gas coupling multipotency streaming system joint static security analysis method proposed by the present invention, includes the following steps：
(1) from the Energy Management System of electric-gas coupling multipotency streaming system, current electric-gas coupling multipotency streaming system is obtained
State estimation result Ψse, including：The voltage magnitude of grid nodes and having for grid branch in electric-gas coupling multipotency streaming system
Work(power, electric-gas couple the gentle net bypass flow of gas net node pressure in multipotency streaming system；
(2) from the Energy Management System of electric-gas coupling multipotency streaming system, electricity in electric-gas coupling multipotency streaming system is obtained
The safe operation constraint Ψ of net, gas netsc, including：Grid nodes voltage magnitude allows maximum in electric-gas coupling multipotency streaming system
Value, grid nodes voltage magnitude allow minimum value, grid branch active power that maximum value and grid branch active power is allowed to permit
Perhaps minimum value, electric-gas coupling multipotency streaming system in gas net node pressure allow maximum value, gas net node pressure allow minimum value,
Gas net bypass flow allows the gentle net bypass flow of maximum value to allow minimum value；
(3) according to the current state estimated result Ψ of above-mentioned steps (1)se, the safe operation of above-mentioned steps (2) is constrained
ΨscJudged：
(3-1) is if all current state estimated result ΨseIt is satisfied by safe operation constraint Ψsc, go to step (4)；
(3-2) is if current state estimated result ΨseMiddle presence is unsatisfactory for safe operation constraint ΨscState, then judgement should
Electric-gas coupling multipotency streaming system is in a state of emergency, and provides safety warning, and provide the specifying information for being unsatisfactory for safe operation,
Safety analytical method terminates；
(4) contingency set Ω is obtained from the Energy Management System of electric-gas coupling multipotency streaming system；
(5) above-mentioned contingency set Ω is judged, if contingency set Ω is empty set, goes to step (7), if anticipation
Accident set Ω is nonempty set, then a forecast accident is taken out from contingency set Ω, forms the electric-gas under the forecast accident
Multipotency flow equation group is coupled, including：
Electric network swim equation in (5-1) electric-gas coupling multipotency streaming system：
Wherein：PiFor the injection active power of power grid interior joint i, QiFor the injection reactive power of power grid interior joint i, θi、θj
Respectively node i, node j voltage phase angle, Ui、UjRespectively node i, node j voltage magnitude, GijFor grid nodes admittance
The real part of the i-th rows of matrix Y, jth column element, BijFor the imaginary part of the i-th rows of grid nodes admittance matrix Y, jth column element, power grid section
Point admittance matrix Y is obtained from the Energy Management System of electric-gas coupling multipotency streaming system；
Natural gas grid waterpower equation in (5-2) electric-gas coupling multipotency streaming system：
Wherein：fkmNatural gas volume flow in pipeline between k-th of node in natural gas grid and m-th of node,
pk, pmThe respectively pressure of k-th of node and m-th of node, Dkm、LkmPipeline between respectively k-th of node and m-th of node
The pipe diameter and duct length of km, F are the friction coefficient of inner wall of the pipe, and F is by formulaIt calculates
It obtains, EfFor the efficiency factor of pipeline, EfValue 0.92, Re are Reynolds number, are calculated by formula Re=ρ vd/ μ, ρ is natural
Air tightness, v are natural gas flow velocity, and μ is natural gas viscosity coefficient, and d is characterized length, γGFor specific gravity of natural gas, value 0-1,
TaFor natural gas mean temperature, Tn、pnTemperature and pressure respectively under Natural gas standard state, Tn、pnValue be respectively 288K,
0.1Mpa, ZgIt is averaged compressible coefficient for natural gas, ZgValue for 0-1, in natural gas grid waterpower equation, when
When, the sgn in above formulap(pk,pm)=1, whenWhen, sgnp(pk,pm)=- 1；
Natural gas grid compressor energy expenditure equation in (5-3) electric-gas coupling multipotency streaming system：
Wherein：pf、peThe pressure of compressor headend node and endpoint node respectively in natural gas grid, BHP are compressor
Energy consumption,For the volume flow of the suction port of compressor, ηcFor the gross efficiency of compressor, ckFor the polytropic coefficient of compressor, ηcAnd ck
It is obtained from the shop instructions of compressor；
Between the electric system coupled by gas turbine and natural gas grid in (5-4) electric-gas coupling multipotency streaming system
Coupled wave equation：
Wherein：fTurFor the combustion gas volume flow of gas turbine, PTurFor the active power of gas turbine, C1、C2And C3For combustion
The combustion gas coefficient of gas-turbine is obtained from the shop instructions of gas turbine；
The node volume flux balance equations of natural gas grid in (5-5) electric-gas coupling multipotency streaming system：
AGF=L,
Wherein：AGFor the node-branch incident matrix of natural gas grid, the energy management of multipotency streaming system is coupled from electric-gas
System obtains, and f is the branch volume flow of natural gas grid, and L is the node injected slurry volume flow of natural gas grid；
(6) using the inferior method of newton pressgang, above-mentioned electric-gas coupling multipotency flow equation group is solved, is obtained under the forecast accident
Electric-gas coupling multipotency streaming system multipotency stream calculation result Ψc, including grid nodes voltage magnitude, grid branch wattful power
The gentle net bypass flow of rate, gas net node pressure, and the forecast accident is deleted from contingency set Ω；
(7) according to the multipotency stream calculation result Ψ of step (5)c, Ψ is constrained to the safe operation of above-mentioned steps (2)scIt carries out
Judge：
(7-1) is if ΨcMeet all safe operation constraint Ψsc, then return to step (5)；
(7-2) is if ΨcMiddle presence is unsatisfactory for status safety operation constraint ΨscState, provide violate safe operation constraint
Warning, then return to step (5)；
(8) judge the current safe operation state of electric-gas coupling multipotency streaming system：
(8-1) to the warning for violating safe operation constraint in step (7) if do not judge that the electric-gas couples multipotency stream
System is in secure normal state；
(8-2) violates the warning that safe operation constrains if being provided in step (7), judges electric-gas coupling multipotency stream system
System is in safe early warning state.
The joint static security analysis method of electric-gas coupling multipotency streaming system proposed by the present invention, features and advantages are：
This method breaks through security analysis of electric power system and only considers the limitation of power grid in itself, it is contemplated that considers supply of electric power and natural gas supply
Influence each other, realize electric-gas coupling multipotency streaming system joint static security analysis, so as to simultaneously analyze consideration electricity
Influence of the various possible forecast accidents to two systems in power supply and natural gas supply, compared to existing respectively to considering electric power
The method that supply and natural gas supply carry out individual secure analysis, improves the accuracy of safety analysis, reduces erroneous judgement and leakage
Sentence.This method can be applied in the on-line operation of electric-gas coupling multipotency streaming system, and multipotency stream energy management is coupled in electric-gas
Middle work when system when safety problem or potential risk there are safety warning is provided, helps to improve electric-gas coupling multipotency stream system
The safety of system operation.
Specific embodiment
Electric-gas coupling multipotency streaming system joint static security analysis method proposed by the present invention, includes the following steps：
(1) from the Energy Management System of electric-gas coupling multipotency streaming system, current electric-gas coupling multipotency streaming system is obtained
State estimation result Ψse, including：The voltage magnitude of grid nodes and having for grid branch in electric-gas coupling multipotency streaming system
Work(power, electric-gas couple the gentle net bypass flow of gas net node pressure in multipotency streaming system；
(2) from the Energy Management System of electric-gas coupling multipotency streaming system, electricity in electric-gas coupling multipotency streaming system is obtained
The safe operation constraint Ψ of net, gas netsc, including：Grid nodes voltage magnitude allows maximum in electric-gas coupling multipotency streaming system
Value, grid nodes voltage magnitude allow minimum value, grid branch active power that maximum value and grid branch active power is allowed to permit
Perhaps minimum value, electric-gas coupling multipotency streaming system in gas net node pressure allow maximum value, gas net node pressure allow minimum value,
Gas net bypass flow allows the gentle net bypass flow of maximum value to allow minimum value；
(3) according to the current state estimated result Ψ of above-mentioned steps (1)se, the safe operation of above-mentioned steps (2) is constrained
ΨscJudged：
(3-1) is if all current state estimated result ΨseIt is satisfied by safe operation constraint Ψsc, go to step (4)；
(3-2) is if current state estimated result ΨseMiddle presence is unsatisfactory for safe operation constraint ΨscState, then judgement should
Electric-gas coupling multipotency streaming system is in a state of emergency, and provides safety warning, and provide the specifying information for being unsatisfactory for safe operation,
Safety analytical method terminates；
(4) contingency set Ω is obtained from the Energy Management System of electric-gas coupling multipotency streaming system；
(5) above-mentioned contingency set Ω is judged, if contingency set Ω is empty set, goes to step (7), if anticipation
Accident set Ω is nonempty set, then a forecast accident is taken out from contingency set Ω, forms the electric-gas under the forecast accident
Multipotency flow equation group is coupled, including：
Electric network swim equation in (5-1) electric-gas coupling multipotency streaming system：
Wherein：PiFor the injection active power of power grid interior joint i, QiFor the injection reactive power of power grid interior joint i, θi、θj
Respectively node i, node j voltage phase angle, Ui、UjRespectively node i, node j voltage magnitude, GijFor grid nodes admittance
The real part of the i-th rows of matrix Y, jth column element, BijFor the imaginary part of the i-th rows of grid nodes admittance matrix Y, jth column element, power grid section
Point admittance matrix Y is obtained from the Energy Management System of electric-gas coupling multipotency streaming system；
Natural gas grid waterpower equation in (5-2) electric-gas coupling multipotency streaming system：
Wherein：fkmNatural gas volume flow in pipeline between k-th of node in natural gas grid and m-th of node,
pk, pmThe respectively pressure of k-th of node and m-th of node, Dkm、LkmPipeline between respectively k-th of node and m-th of node
The pipe diameter and duct length of km, F are the friction coefficient of inner wall of the pipe, and F is by formulaIt calculates
It obtains, EfFor the efficiency factor of pipeline, EfValue 0.92, Re are Reynolds number, are calculated by formula Re=ρ vd/ μ, ρ is natural
Air tightness, v are natural gas flow velocity, and μ is natural gas viscosity coefficient, and d is characterized length, γGFor specific gravity of natural gas, value 0-1,
TaFor natural gas mean temperature, Tn、pnTemperature and pressure respectively under Natural gas standard state, Tn、pnValue be respectively 288K,
0.1Mpa, ZgIt is averaged compressible coefficient for natural gas, ZgValue for 0-1, in natural gas grid waterpower equation, when
When, the sgn in above formulap(pk,pm)=1, whenWhen, sgnp(pk,pm)=- 1；
Natural gas grid compressor energy expenditure equation in (5-3) electric-gas coupling multipotency streaming system：
Wherein：pf、peThe pressure of compressor headend node and endpoint node respectively in natural gas grid, BHP are compressor
Energy consumption,For the volume flow of the suction port of compressor, ηcFor the gross efficiency of compressor, ckFor the polytropic coefficient of compressor, ηcAnd ck
It is obtained from the shop instructions of compressor；
Between the electric system coupled by gas turbine and natural gas grid in (5-4) electric-gas coupling multipotency streaming system
Coupled wave equation：
Wherein：fTurFor the combustion gas volume flow of gas turbine, PTurFor the active power of gas turbine, C1、C2And C3For combustion
The combustion gas coefficient of gas-turbine is obtained from the shop instructions of gas turbine；
The node volume flux balance equations of natural gas grid in (5-5) electric-gas coupling multipotency streaming system：
AGF=L,
Wherein：AGFor the node-branch incident matrix of natural gas grid, the energy management of multipotency streaming system is coupled from electric-gas
System obtains, and f is the branch volume flow of natural gas grid, and L is the node injected slurry volume flow of natural gas grid；
(6) using the inferior method of newton pressgang, above-mentioned electric-gas coupling multipotency flow equation group is solved, is obtained under the forecast accident
Electric-gas coupling multipotency streaming system multipotency stream calculation result Ψc, including grid nodes voltage magnitude, grid branch wattful power
The gentle net bypass flow of rate, gas net node pressure, and the forecast accident is deleted from contingency set Ω；
(7) according to the multipotency stream calculation result Ψ of step (5)c, Ψ is constrained to the safe operation of above-mentioned steps (2)scIt carries out
Judge：
(7-1) is if ΨcMeet all safe operation constraint Ψsc, then return to step (5)；
(7-2) is if ΨcMiddle presence is unsatisfactory for status safety operation constraint ΨscState, provide violate safe operation constraint
Warning, then return to step (5)；
(8) judge the current safe operation state of electric-gas coupling multipotency streaming system：
(8-1) to the warning for violating safe operation constraint in step (7) if do not judge that the electric-gas couples multipotency stream
System is in secure normal state；
(8-2) violates the warning that safe operation constrains if being provided in step (7), judges electric-gas coupling multipotency stream system
System is in safe early warning state.
Claims (1)
- A kind of 1. electric-gas coupling multipotency streaming system joint static security analysis method, it is characterised in that this method includes following step Suddenly：(1) from the Energy Management System of electric-gas coupling multipotency streaming system, the shape of current electric-gas coupling multipotency streaming system is obtained State estimated result Ψse, including：The voltage magnitude of grid nodes and the wattful power of grid branch in electric-gas coupling multipotency streaming system Rate, electric-gas couple the gentle net bypass flow of gas net node pressure in multipotency streaming system；(2) from the Energy Management System of electric-gas coupling multipotency streaming system, power grid, gas in electric-gas coupling multipotency streaming system are obtained The safe operation constraint Ψ of netsc, including：Grid nodes voltage magnitude allows maximum value, power grid in electric-gas coupling multipotency streaming system Node voltage amplitude allows minimum value, grid branch active power that maximum value and grid branch active power is allowed to allow minimum Value, electric-gas, which couples gas net node pressure in multipotency streaming system, allows maximum value, gas net node pressure to allow minimum value, gas net branch Road flow allows the gentle net bypass flow of maximum value to allow minimum value；(3) according to the current state estimated result Ψ of above-mentioned steps (1)se, Ψ is constrained to the safe operation of above-mentioned steps (2)scInto Row judges：(3-1) is if all current state estimated result ΨseIt is satisfied by safe operation constraint Ψsc, go to step (4)；(3-2) is if current state estimated result ΨseMiddle presence is unsatisfactory for safe operation constraint ΨscState, then judge the electric-gas Coupling multipotency streaming system is in a state of emergency, and provides safety warning, and provide the specifying information for being unsatisfactory for safe operation, safety point Analysis method terminates；(4) contingency set Ω is obtained from the Energy Management System of electric-gas coupling multipotency streaming system；(5) above-mentioned contingency set Ω is judged, if contingency set Ω is empty set, (7) is gone to step, if forecast accident Integrate Ω as nonempty set, then a forecast accident is taken out from contingency set Ω, form the electric-gas coupling under the forecast accident Multipotency flow equation group, including：Electric network swim equation in (5-1) electric-gas coupling multipotency streaming system：Wherein：PiFor the injection active power of power grid interior joint i, QiFor the injection reactive power of power grid interior joint i, θi、θjRespectively For node i, the voltage phase angle of node j, Ui、UjRespectively node i, node j voltage magnitude, GijFor grid nodes admittance matrix The real part of the i-th rows of Y, jth column element, BijFor the imaginary part of the i-th rows of grid nodes admittance matrix Y, jth column element, grid nodes are led The matrix Y that receives is obtained from the Energy Management System of electric-gas coupling multipotency streaming system；Natural gas grid waterpower equation in (5-2) electric-gas coupling multipotency streaming system：Wherein：fkmNatural gas volume flow in pipeline between k-th of node in natural gas grid and m-th of node, pk, pm The respectively pressure of k-th of node and m-th of node, Dkm、LkmPipeline km between respectively k-th of node and m-th of node Pipe diameter and duct length, F are the friction coefficient of inner wall of the pipe, and F is by formulaIt is calculated, EfFor the efficiency factor of pipeline, EfValue 0.92, Re are Reynolds number, are calculated by formula Re=ρ vd/ μ, and ρ is natural airtight Degree, v are natural gas flow velocity, and μ is natural gas viscosity coefficient, and d is characterized length, γGFor specific gravity of natural gas, value 0-1, TaFor Natural gas mean temperature, Tn、pnTemperature and pressure respectively under Natural gas standard state, Tn、pnValue be respectively 288K, 0.1Mpa, ZgIt is averaged compressible coefficient for natural gas, ZgValue for 0-1, in natural gas grid waterpower equation, when When, the sgn in above formulap(pk,pm)=1, whenWhen, sgnp(pk,pm)=- 1；Natural gas grid compressor energy expenditure equation in (5-3) electric-gas coupling multipotency streaming system：Wherein：pf、peThe pressure of compressor headend node and endpoint node respectively in natural gas grid, BHP are the energy of compressor Consumption,For the volume flow of the suction port of compressor, ηcFor the gross efficiency of compressor, ckFor the polytropic coefficient of compressor, ηcAnd ckFrom The shop instructions of compressor obtain；The coupling between the electric system coupled by gas turbine and natural gas grid in (5-4) electric-gas coupling multipotency streaming system Close equation：Wherein：fTurFor the combustion gas volume flow of gas turbine, PTurFor the active power of gas turbine, C1、C2And C3For combustion gas wheel The combustion gas coefficient of machine is obtained from the shop instructions of gas turbine；The node volume flux balance equations of natural gas grid in (5-5) electric-gas coupling multipotency streaming system：AGF=L,Wherein：AGFor the node-branch incident matrix of natural gas grid, obtained from the Energy Management System of electric-gas coupling multipotency streaming system It takes, f is the branch volume flow of natural gas grid, and L is the node injected slurry volume flow of natural gas grid；(6) using the inferior method of newton pressgang, solve above-mentioned electric-gas coupling multipotency flow equation group, obtain electricity under the forecast accident- Gas couples the multipotency stream calculation result Ψ of multipotency streaming systemc, including grid nodes voltage magnitude, grid branch active power, gas The gentle net bypass flow of net node pressure, and the forecast accident is deleted from contingency set Ω；(7) according to the multipotency stream calculation result Ψ of step (5)c, Ψ is constrained to the safe operation of above-mentioned steps (2)scJudged：(7-1) is if ΨcMeet all safe operation constraint Ψsc, then return to step (5)；(7-2) is if ΨcMiddle presence is unsatisfactory for status safety operation constraint ΨscState, provide violate safe operation constraint police It accuses, then return to step (5)；(8) judge the current safe operation state of electric-gas coupling multipotency streaming system：(8-1) to the warning for violating safe operation constraint in step (7) if do not judge that the electric-gas couples multipotency streaming system In secure normal state；(8-2) violates the warning that safe operation constrains if being provided in step (7), judges at electric-gas coupling multipotency streaming system In safe early warning state.
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