CN106602552A - Power-gas combined scheduling method and system - Google Patents

Abstract

The invention relates to a power-gas combined scheduling method and system. The method includes the following steps: acquiring a prediction load, supply prices of a liquefied natural gas at each and every time, the topological data of a natural gas system network, the topological data of a power system, the operation data of a coal-fired unit which takes part in the scheduling and operation and the operation data of a gas generator set, basic data of a liquefied natural gas receiving station and the operation state of the liquefied natural gas receiving station, and the information about arrival at port of a transportation ship which belongs to the liquefied natural gas receiving station; based on the aforementioned information, constructing a power-gas combined scheduling model and constraining conditions thereof, adopting a nonlinear plan solver, solving the power-gas combined scheduling model based on the constraining conditions to obtain the result of scheduling and operation of the coal-fired unit and the gas generator set, and controlling the operation of the coal-fired unit and the gas generator set based on the result of scheduling and operation of the coal-fired unit and the gas generator set. The method considers the uniqueness of the gas source of the liquefied natural gas and also the risks in supply, and has strong practicality.

Description

Electric combined scheduling method and system

Technical field

The present invention relates to electric association system management and running field, more particularly to a kind of electric combined scheduling method and it is System.

Background technology

It is considered a kind of clean electric power generation side natural gas power has the advantages that high efficiency, low emission because of it, start and stop are rapid Formula, Gas Generator Set also has very important effect in Operation of Electric Systems.Liquefied natural gas (liquefied natural Gas, liquefied natural gas) there is economical and efficient, clean environment firendly, flexible, safe and reliable, so as to become current state Border energy market fuel with fastest developing speed, is also the major way for supplementing China's natural gas insufficiency of supply-demand.

With the rapid growth of LNG Trade, liquefied natural gas receiving station is used as a kind of ratio of new source of the gas To continue to increase.Different from native country is marine, land source of the gas, liquefied natural gas receiving station as new source of the gas, by overseas natural gas Supplier Jing off-lying sea shippings are consumed to native country, and its tolerance supply, supply operation characteristic are different from conventional source of the gas, and its receiving station is usual It build coastal area in, liquefied natural gas at sea will be affected in transportation by factors such as typhoon, shippings, and resource provisioning is deposited In larger uncertainty；When liquified natural gas carrier (LNGC) cannot arrive port on time, need to follow-up one week in addition it is longer when Between the method for operation of gas electric system carry out decision-making again, and normally to the method for operation under port there is larger difference It is different.It is the essential condition for ensureing the safe and reliable supply of natural gas to study its supply uncertainty.

The content of the invention

Based on this, it is necessary to a kind of electric combined scheduling method and system are provided, it is contemplated that natural gas supply is not true Qualitatively problem, the operation for coal unit and combustion gas group machine provides guidance.

A kind of electric combined scheduling method, including：

Obtain prediction load, liquefied natural gas each moment supply price, natural gas system network topology data, electric power Grid topological data, participates in the service data and the service data of Gas Generator Set of the coal unit of management and running, and liquefy day The basic data and its running state data of Ran Qi receiving stations, the cargo ship of the liquefied natural gas receiving station to port information；

According to the basic data and its running state data of the liquefied natural gas receiving station, liquefied natural gas is at each moment Supply price, participate in management and running coal unit service data and Gas Generator Set service data build electric power joint adjust Degree model；

According to the electric load forecasting, natural gas system network topology data, power system network topological data, participate in The service data of the coal unit of management and running and the service data of Gas Generator Set, the basic data of liquefied natural gas receiving station and The cargo ship of its running state data and the liquefied natural gas receiving station to port information architecture electric power integrated distribution model Constraints；

Using nonlinear planning solution device, the electric power integrated distribution model is solved according to the constraints and obtains fire coal The management and running result of unit and Gas Generator Set；

Coal unit and Gas Generator Set according to the management and running output control of the coal unit and Gas Generator Set Operation.

A kind of electric combined dispatching system, including：Parameter acquisition module, scheduling model generation module, constraints are generated Module, computing module and control module；

The parameter acquisition module, for obtain prediction load, liquefied natural gas each moment supply price, natural gas Grid topological data, power system network topological data participates in service data and the combustion gas of the coal unit of management and running The service data of unit, the basic data and its running state data of liquefied natural gas receiving station, the liquefied natural gas is received The cargo ship stood to port information；

The scheduling model generation module, for according to the basic data of the liquefied natural gas receiving station and its operation shape State data, liquefied natural gas participates in the service data and gas engine of the coal unit of management and running in the supply price at each moment The service data of group builds electric power integrated distribution model；

The constraints generation module, for according to the electric load forecasting, natural gas system network topology data, Power system network topological data, participates in the service data and the service data of Gas Generator Set of the coal unit of management and running, liquid Change the basic data of natural gas receiving station and its cargo ship of running state data and the liquefied natural gas receiving station to port The constraints of information architecture electric power integrated distribution model；

The computing module, for using nonlinear planning solution device, according to the constraints electric power connection being solved Close the management and running result that scheduling model obtains coal unit and Gas Generator Set；

The control module, for coal-fired according to the management and running output control of the coal unit and Gas Generator Set The operation of unit and Gas Generator Set.

Above-mentioned electric combined scheduling method, introduces natural gas supply factor, it is considered to which natural gas supply is uncertain, to electricity Gas integrated distribution model is modified, it is proposed that one kind considers the probabilistic electric combined scheduling method of natural gas supply, is A few days ago generation schedule is formulated and provides effective tool.The method has taken into full account practical power systems and natural gas system operational management Pattern, it is considered to particularity of the liquefied natural gas source of the gas in supply and its supply risk, arrives with reference to the cargo ship of liquefied natural gas Port information and liquefied natural gas receiving station running status carry out electric combined dispatching, with very strong practicality, and can analyze The method of operation and benefit that electrically association system is supplied under scene in different liquefied natural gas.

Description of the drawings

Fig. 1 is the flow chart of the electric combined scheduling method of one embodiment；

Fig. 2 is the structured flowchart of the electric combined dispatching system of one embodiment.

Specific embodiment

In one embodiment, there is provided a kind of electric combined scheduling method, as shown in figure 1, comprising the following steps：

S102：Obtain prediction load, liquefied natural gas each moment supply price, natural gas system network topology number According to, power system network topological data participates in the service data and the service data of Gas Generator Set of the coal unit of management and running, The basic data and its running state data of liquefied natural gas receiving station, the cargo ship of liquefied natural gas receiving station is believed to port Breath.

Prediction load can be following 7 days prediction loads.Prediction load can be obtained by load forecasting method within following 7 days Arrive, including electric load forecasting P in 7 days futures_D,tWith occupy domestic gas load prediction data L_n, duration is dispatched in units of 6h.

Liquefied natural gas S is designated as ρ in the supply price of each moment t_s,t。

Natural gas system network can regard the directed graph being made up of node and pipeline, compressor as.Natural gas system network is opened up Data are flutterred including node-pipeline incidence matrix A_N×L, node-compressor incidence matrix B_N×C, gas pipeline configured transmission C_l, calm the anger Machine is maximum, minimum air pressure no-load voltage ratio R_c·max、R_c·min。

Node-pipeline incidence matrix A_N×LMiddle N is natural gas system nodes, and L is natural gas system pipe number, in matrix A Element a_nlRepresent node n and pipeline l incidence relations：a_nl=1 represents node n for pipeline l headend nodes, a_nl=-1 represents node n For pipeline l endpoint nodes；

Node-compressor incidence matrix B_N×CMiddle C be compressor number of units, element b in matrix B_ncRepresent node n and compressor C incidence relations：b_nc=1 represents node n for compressor c headend nodes, b_nc=-1 represents that node n is compressor c endpoint nodes.

Gas pipeline configured transmission C_lWith duct length, diameter, running temperature and pressure, Natural Gas Type, duct height Change is relevant with inner-walls of duct degree of roughness.

Power system network topological data includes internetwork connection mode, Line Flow constraint upper limit P_b·max。

The service data of the coal unit and Gas Generator Set that participate in management and running includes the active bound of exerting oneself of coal unit P_i·max、P_i·min, fuel cost function F_i(P_i,t), active bounds P of exerting oneself of Gas Generator Set j_j·max、P_j·min。

The basic data of liquefied natural gas receiving station, including：Source of the gas s gas supply flow upper lower limit value g_s·max、g_s·min, receive Stand in the liquefied natural gas reserves V of initial time_s0, bound V of receiving station's liquefied natural gas reserves_s·max、V_s·min。

The running status of liquefied natural gas receiving station includes normal operation/conservative operation.Liquefied natural gas receiving station is daily Deposit has a certain amount of liquefied natural gas cannot arrive the sea-freight risk at port to tackle liquified natural gas carrier (LNGC), when scheduling initial time Liquified natural gas carrier (LNGC) fail on time to port when, there are following two methods of operation in receiving station：

1) normal operation：Receiving station adjusts natural gas supply by downstream workload demand；

2) operation is guarded：Receiving station reduces as far as possible natural gas supply, improves liquefied natural gas remaining reserves in station, to answer To secondary sea-freight risk.

The cargo ship of liquefied natural gas receiving station to port information I_l,t, for the supply of liquefied natural gas source of the gas, mainly examine Consider its sea-freight risk, i.e., the liquified natural gas carrier (LNGC) for causing because of special extreme weather cannot on time to the situation at port, thus Cause coastal cities supply anxiety, the generation schedule of Gas Generator Set also will be by large effect.

S104：According to the basic data and its running state data of liquefied natural gas receiving station, liquefied natural gas is when each The supply price at quarter, the service data of the service data and Gas Generator Set that participate in the coal unit of management and running builds electric power joint Scheduling model.

Specifically, if liquefied natural gas receiving station normally runs, 7 Tian Nei receiving stations tolerance abundances are referred generally to, now Object function is constructed with system supply, the minimum principle of total generation cost, object function is configured to

Wherein, g_s,tFor source of the gas s moment t gas supply flow, ρ_s,tFor source of the gas s moment t supply price, NG is system Coal unit number, F_i(P_i,t) for coal unit i fuel cost function, P_i,tFor coal unit generated output.

If the conservative operation of liquefied natural gas receiving station, receiving station reduces as far as possible natural gas supply, improves liquid in station Change natural gas remaining reserves, to tackle secondary sea-freight risk, increase uses gas penalty factor, object function to be configured to

Wherein,It is that last moment t is being dispatched by liquefied natural gas receiving station_mWhen liquefied natural gas reserves, v for punishment because Son.

S106：According to electric load forecasting, natural gas system network topology data, power system network topological data, ginseng With the service data and the service data of Gas Generator Set of the coal unit of management and running, the basic data of liquefied natural gas receiving station And its pact to port information architecture electric power integrated distribution model of the cargo ship of running state data and liquefied natural gas receiving station Beam condition.

Specifically, the constraints of electric power integrated distribution model includes：Power system constraints, pneumoelectric coupling constraint bar Part, natural gas system constraints.

Power system constraints, including the constraint of electric power networks Constraints of Equilibrium, Line Flow, the active bound of exerting oneself of unit Constraint.

Electric power networks Constraints of Equilibrium is：

Wherein, P_D,tFor t system total load, NC is Gas Generator Set number, P_j,tFor Gas Generator Set generated output.

Line Flow is constrained, using DC flow model：

|P_b,t|≤P_b·max

Wherein, P_b,tFor branch road b t effective power flow, P_b·_maxFor the branch road b effective power flow upper limits.

The active bound of exerting oneself of unit is constrained to：

Wherein, P_i·max、P_i·minFor the active bounds of exerting oneself of coal unit i, P_j·max、P_j·minFor Gas Generator Set j it is active go out Power bound.

Gas distributing system is produced at Gas Generator Set with power system and coupled, and the fuel natural gas for being embodied in gas turbine disappear Consumption and the active relation exerted oneself, describe without loss of generality the pass between Gas Generator Set generated output and air consumption with quadratic function System.Pneumoelectric coupling constraint condition is：

Wherein, f_j(P_j) for Gas Generator Set generated output be P_jWhen consume gas discharge, K_2j、K_1jAnd K_0jFor combustion Mechanism of qi group fuel consumption parameter.

Natural gas system constraints, including gas source feed flow restriction, the liquefied natural gas reserves restriction of receiving station, storage Air reservoir storage tolerance restriction, transmission pipeline model, preferable compressor model, network equilibrium equation.

Gas source feed flow restriction is：

g_s·min≤g_s,t≤g_s·max

Wherein g_s,tFor source of the gas s moment t gas supply flow, g_s·max、g_s·minRespectively source of the gas s gas supply flows bound.

The liquefied natural gas reserves of receiving station are limited to：

V_s·min≤V_s,t≤V_s·max

Wherein, V_s,tBe receiving station t end liquefied natural gas reserves, V_s0For receiving station initial time liquefaction Gas reserves；I_l,tRepresent whether t liquified natural gas carrier (LNGC) arrives port, I_l,tPress for 1 expression liquified natural gas carrier (LNGC) When to port, be 0 expression liquified natural gas carrier (LNGC) not to port, V_l,tGas contract liquified natural gas carrier (LNGC) is purchased for a long time for t Effective discharging quantity；T₀Can be a hour or several decimals for unit scheduling time；R be liquefied natural gas (liquid) with The volume no-load voltage ratio of natural gas (gaseous state), is 1/625.V_s·maxAnd V_s·minThe respectively bound of receiving station's liquefied natural gas reserves.

Gas storage library storage tolerance is limited to：

Wherein, V_st0、V_st,tRespectively dispatch gas-storing capacity in just moment and last moment gas storage, I_st,t、O_st,tRespectively store up Gas storage, gas supply flows of the air reservoir st in moment t, V_st·max、V_st·minFor gas storage gas-storing capacity bound, I_st·max、I_st·minRespectively For gas storage gas storage flow bound, O_st·max、O_st·minRespectively gas storage gas supply flow bound.

Transmission pipeline model is：

Wherein, f_lFor pipe natural gas flow, p_m、p_nThe respectively air pressure of pipe ends first and last node m and n, f_lFor positive table Show that natural gas flows to node n, f by node m in pipeline_lNode m is flowed to by node n for natural gas in negative indication pipeline.

Preferable compressor model is：

Wherein, R_c·max、R_c·minRespectively compressor c is maximum, minimum air pressure no-load voltage ratio.

Network equilibrium equation is：

Wherein, s, st are the source of the gas and gas storage for being connected to node n, L_nTo occupy domestic gas load at node n.

S108：Using nonlinear planning solution device, electric power integrated distribution model is solved according to constraints and obtains coal burning machine The management and running result of group and Gas Generator Set.

S110：According to coal unit and the management and running output control coal unit and the fortune of Gas Generator Set of Gas Generator Set OK.

Above-mentioned electric combined scheduling method, introduces natural gas supply factor, it is considered to which natural gas supply is uncertain, to electricity Gas integrated distribution model is modified, it is proposed that one kind considers the probabilistic electric combined scheduling method of natural gas supply, is A few days ago generation schedule is formulated and provides effective tool.The method has taken into full account practical power systems and natural gas system operational management Pattern, it is considered to particularity of the liquefied natural gas source of the gas in supply and its supply risk, arrives with reference to the cargo ship of liquefied natural gas Port information and liquefied natural gas receiving station running status carry out electric combined dispatching, with very strong practicality, and can analyze The method of operation and benefit that electrically association system is supplied under scene in different liquefied natural gas.

It is emphasized that the liquefied natural gas receiving station running status considered in this method implementation steps and corresponding mesh Scalar functions, natural gas system limiting factor, electric association system scheduling minimum scheduling duration and total activation cycle etc. can bases The actual electrically operating data resource of association system and practical situation etc. are flexibly customized, and extensibility is strong.Time dimension On, for example with a daily load data and dispatching cycle on the one, it is also possible to during for electric combined dispatching a few days ago, etc..

In another embodiment, as shown in Fig. 2 a kind of electric combined dispatching system, including：Parameter acquisition module 201, Scheduling model generation module 202, constraints generation module 203, computing module 204 and control module 205.

Parameter acquisition module 201, for obtain prediction load, liquefied natural gas each moment supply price, natural gas Grid topological data, power system network topological data participates in service data and the combustion gas of the coal unit of management and running The service data of unit, the basic data and its running state data of liquefied natural gas receiving station, liquefied natural gas receiving station Cargo ship to port information.

Scheduling model generation module 202, for according to the basic data of liquefied natural gas receiving station and its running status number According to, liquefied natural gas in the supply price at each moment, the service data and Gas Generator Set of the coal unit of management and running are participated in Service data builds electric power integrated distribution model.

Constraints generation module 203, for according to electric load forecasting, natural gas system network topology data, electric power Grid topological data, participates in the service data and the service data of Gas Generator Set of the coal unit of management and running, and liquefy day The basic data and its running state data of Ran Qi receiving stations and the cargo ship of liquefied natural gas receiving station to port information architecture The constraints of electric power integrated distribution model.

Computing module 204, for using nonlinear planning solution device, according to constraints electric power integrated distribution model being solved Obtain the management and running result of coal unit and Gas Generator Set.

Control module 205, for according to the management and running output control coal unit of coal unit and Gas Generator Set and combustion The operation of mechanism of qi group.

Above-mentioned electric combined dispatching system, introduces natural gas supply factor, it is considered to which natural gas supply is uncertain, to electricity Gas integrated distribution model is modified, it is proposed that one kind considers the probabilistic electric combined scheduling method of natural gas supply, is A few days ago generation schedule is formulated and provides effective tool.The method has taken into full account practical power systems and natural gas system operational management Pattern, it is considered to particularity of the liquefied natural gas source of the gas in supply and its supply risk, arrives with reference to the cargo ship of liquefied natural gas Port information and liquefied natural gas receiving station running status carry out electric combined dispatching, with very strong practicality, and can analyze The method of operation and benefit that electrically association system is supplied under scene in different liquefied natural gas.

Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality Apply all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, the scope of this specification record is all considered to be.

Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but and Can not therefore be construed as limiting the scope of the patent.It should be pointed out that for one of ordinary skill in the art comes Say, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the protection of the present invention Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.

Claims (10)

1. a kind of electric combined scheduling method, it is characterised in that include：

Obtain prediction load, liquefied natural gas each moment supply price, natural gas system network topology data, power system Network topology data, participate in the service data and the service data of Gas Generator Set of the coal unit of management and running, liquefied natural gas The basic data and its running state data of receiving station, the cargo ship of the liquefied natural gas receiving station to port information；

According to the basic data and its running state data of the liquefied natural gas receiving station, confession of the liquefied natural gas at each moment Gas price lattice, the service data of the service data and Gas Generator Set that participate in the coal unit of management and running builds electric power combined dispatching mould Type；

According to the electric load forecasting, natural gas system network topology data, power system network topological data, scheduling is participated in The service data of the coal unit of operation and the service data of Gas Generator Set, the basic data and its fortune of liquefied natural gas receiving station The constraint to port information architecture electric power integrated distribution model of the cargo ship of row status data and the liquefied natural gas receiving station Condition；

Using nonlinear planning solution device, the electric power integrated distribution model is solved according to the constraints and obtains coal unit With the management and running result of Gas Generator Set；

The operation of coal unit and Gas Generator Set according to the management and running output control of the coal unit and Gas Generator Set.

2. method according to claim 1, it is characterised in that the running status of the liquefied natural gas station includes normal fortune Row and conservative operation；Scheduling model and conservative fortune when the electric power combined dispatching module includes that liquefied natural gas station normally runs Scheduling model during row；

Scheduling model when liquefied natural gas station normally runs is：

$\min \{\underset{t}{\Σ}\underset{s}{\Σ}{g}_{s,t}\·{\mathrm{\ρ}}_{s,t}+\underset{t}{\Σ}\underset{i=1}{\overset{NG}{\Σ}}{F}_i\left(P_{i,t}\right)\};$

Wherein, g_s,tFor source of the gas s moment t gas supply flow, ρ_s,tFor source of the gas s moment t supply price, NG is that system is coal-fired Unit number, F_i(P_i,t) for coal unit i fuel cost function, P_i,tFor coal unit generated output；

Scheduling model when liquefied natural gas station guards operation is：

$min\{\underset{t}{\Σ}\underset{s}{\Σ}{g}_{s,t}\·{\mathrm{\ρ}}_{s,t}+\underset{t}{\Σ}\underset{i=1}{\overset{NG}{\Σ}}{F}_i\left(P_{i,t}\right)-\underset{s}{\Σ}v\·V_{s,t_m}\}$

Wherein,It is liquefied natural gas receiving station in scheduling instance t_mWhen liquefied natural gas reserves, v is penalty factor.

3. method according to claim 2, it is characterised in that the constraints of the electric power integrated distribution model includes： Power system constraints, pneumoelectric coupling constraint condition and natural gas system constraints.

4. method according to claim 3, it is characterised in that the power system constraints includes：Electric power networks are put down Weighing apparatus constraint, Line Flow constraint, the active bound constraint of exerting oneself of unit；

The electric power networks Constraints of Equilibrium is：

$\underset{i=1}{\overset{NG}{\mathrm{\Σ}}}{P}_{i,t}+\underset{j=1}{\overset{NC}{\mathrm{\Σ}}}{P}_{j,t}=P_{D,t};$

Wherein, P_D,tFor t system total load, NC is Gas Generator Set number, P_j,tFor Gas Generator Set generated output；

The Line Flow is constrained to：

|P_b,t|≤P_b·max；

Wherein, P_b,tFor branch road b t effective power flow, P_b·maxFor the branch road b effective power flow upper limits；

The active bound of exerting oneself of the unit is constrained to：

$\left\{\begin{array}{c}{P}_{i\·\min }\≤P_{i,t}\≤P_{i\·\max }\\ P_{j\·\min }\≤P_{j,t}\≤P_{j\·\max }\end{array}\right.;$

Wherein, P_i·max、P_i·minFor the active bounds of exerting oneself of coal unit i, P_j·max、P_j·minOn exerting oneself for Gas Generator Set j is active Lower limit.

5. method according to claim 3, it is characterised in that the pneumoelectric coupling constraint condition is：

$f_j\left(P_j\right)=K_{2j}\·P_j^2+K_{1j}\·P_j+K_{0j};$

Wherein, f_j(P_j) for Gas Generator Set generated output be P_jWhen consume gas discharge, K_2j、K_1jAnd K_0jFor gas engine Group fuel consumption parameter.

6. method according to claim 3, it is characterised in that the natural gas system constraints includes：Gas source feed Flow restriction, the liquefied natural gas reserves restriction of receiving station, the restriction of gas storage library storage tolerance, transmission pipeline model, ideal are calmed the anger Machine model, network equilibrium equation；

The gas source feed flow restriction is：

g_s·min≤g_s,t≤g_s·max

Wherein, g_s,tFor source of the gas s moment t gas supply flow, g_s·max、g_s·minRespectively source of the gas s gas supply flows bound；

The liquefied natural gas reserves of the receiving station are limited to：

$V_{s,t}=V_{s0}+I_{l,t}\·V_{l,t}-T_0\underset{t=1}{\overset{t}{\Σ}}{g}_{s,t}\·r$

V_s·min≤V_s,t≤V_s·max

Wherein, V_s,tBe receiving station t end liquefied natural gas reserves, V_s0It is natural in the liquefaction of initial time for receiving station Gas reserves；I_l,tRepresent whether t liquified natural gas carrier (LNGC) arrives port, I_l,tArrive on time for 1 expression liquified natural gas carrier (LNGC) Port is 0 expression liquified natural gas carrier (LNGC) not to port, V_l,tThe effective of gas contract liquified natural gas carrier (LNGC) is purchased for a long time for t Discharging quantity；T₀For unit scheduling time；R is the volume no-load voltage ratio of liquefied natural gas and natural gas, is 1/625；V_s·maxAnd V_s·minPoint Not Wei receiving station's liquefied natural gas reserves bound；

The gas storage library storage tolerance is limited to：

$V_{st,t}=V_{st0}+T_0\·\underset{t=1}{\overset{t}{\Σ}}(I_{st,t}-O_{st,t})$

$\left\{\begin{array}{c}{V}_{st\·\min }\≤V_{st,t}\≤V_{st\·max}\\ I_{st,t}\·O_{st,t}=0\end{array}\right.$

$\left\{\begin{array}{c}{I}_{st\·\min }\≤I_{st,t}\≤I_{st\·max}\\ O_{st\·min}\≤O_{st,t}\≤O_{st,max}\end{array}\right.$

Wherein, V_st0、V_st,tRespectively dispatch gas-storing capacity in just moment and last moment gas storage, I_st,t、O_st,tRespectively gas storage Gas storage, gas supply flows of the st in moment t, V_st·max、V_st·minFor gas storage gas-storing capacity bound, I_st·max、I_st·minRespectively store up Air reservoir gas storage flow bound, O_st·max、O_st·minRespectively gas storage gas supply flow bound；

The transmission pipeline model is：

$f_l=\mathrm{sgn}(p_m,p_n)\·C_l\sqrt{|p_m^2-p_n^2|}$

$\mathrm{sgn}(p_m,p_n)=\left\{\begin{array}{cc}1& p_m\&GreaterEqual;p_n\\ -1& p_m<p_n\end{array}\right.$

Wherein, f_lFor pipe natural gas flow, p_m、p_nThe respectively air pressure of pipe ends first and last node m and n, f_lJust to represent pipe Natural gas flows to node n, f by node m in road_lNode m is flowed to by node n for natural gas in negative indication pipeline；

The preferable compressor model is：

$\left\{\begin{array}{c}{R}_{c\&CenterDot;min}\&le;\frac{p_n}{p_m}\&le;R_{c\&CenterDot;max}\\ f_c\&GreaterEqual;0\end{array}\right.$

Wherein, R_c·max、R_c·minRespectively compressor c is maximum, minimum air pressure no-load voltage ratio；

The network equilibrium equation is：

$\begin{array}{c}\underset{s\&Element;\left(n\right)}{\&Sigma;}{g}_{s,t}+\underset{st\&Element;\left(n\right)}{\&Sigma;}(O_{st,t}-I_{st,t})-A\&CenterDot;f_l-B\&CenterDot;f_c\\ -L_n-\underset{j\&Element;\left(n\right)}{\&Sigma;}{f}_j=0\end{array}$

Wherein, s, st are the source of the gas and gas storage for being connected to node n, L_nTo occupy domestic gas load at node n.

7. a kind of electric combined dispatching system, it is characterised in that include：Parameter acquisition module, scheduling model generation module, constraint Condition generation module, computing module and control module；

The parameter acquisition module, for obtain prediction load, liquefied natural gas each moment supply price, natural gas system Network topology data, power system network topological data participates in the service data and Gas Generator Set of the coal unit of management and running Service data, the basic data and its running state data of liquefied natural gas receiving station, the liquefied natural gas receiving station Cargo ship to port information；

The scheduling model generation module, for according to the basic data and its running status number of the liquefied natural gas receiving station According to, liquefied natural gas in the supply price at each moment, the service data and Gas Generator Set of the coal unit of management and running are participated in Service data builds electric power integrated distribution model；

The constraints generation module, for according to the electric load forecasting, natural gas system network topology data, electric power Grid topological data, participates in the service data and the service data of Gas Generator Set of the coal unit of management and running, and liquefy day The cargo ship of the basic data and its running state data of Ran Qi receiving stations and the liquefied natural gas receiving station to port information Build the constraints of electric power integrated distribution model；

The computing module, for using nonlinear planning solution device, solving the electric power joint according to the constraints and adjusting Degree model obtains the management and running result of coal unit and Gas Generator Set；

The control module, for the coal unit according to the management and running output control of the coal unit and Gas Generator Set With the operation of Gas Generator Set.

8. system according to claim 7, it is characterised in that the running status of the liquefied natural gas station includes normal fortune Row and conservative operation；Scheduling model and conservative fortune when the electric power combined dispatching module includes that liquefied natural gas station normally runs Scheduling model during row；

Scheduling model when liquefied natural gas station normally runs is：

$min\{\underset{t}{\&Sigma;}\underset{s}{\&Sigma;}{g}_{s,t}\&CenterDot;{\mathrm{\&rho;}}_{s,t}+\underset{t}{\&Sigma;}\underset{i=1}{\overset{NG}{\&Sigma;}}{F}_i\left(P_{i,t}\right)\};$

Wherein, g_s,tFor source of the gas s moment t gas supply flow, ρ_s,tFor source of the gas s moment t supply price, NG is that system is coal-fired Unit number, F_i(P_i,t) for coal unit i fuel cost function, P_i,tFor coal unit generated output；

Scheduling model when liquefied natural gas station guards operation is：

$min\{\underset{t}{\&Sigma;}\underset{s}{\&Sigma;}{g}_{s,t}\&CenterDot;{\mathrm{\&rho;}}_{s,t}+\underset{t}{\&Sigma;}\underset{i=1}{\overset{NG}{\&Sigma;}}{F}_i\left(P_{i,t}\right)-\underset{s}{\&Sigma;}v\&CenterDot;V_{s,t_m}\}$

Wherein,It is liquefied natural gas receiving station in scheduling instance t_mWhen liquefied natural gas reserves, v is penalty factor.

9. system according to claim 8, it is characterised in that the constraints of the electric power integrated distribution model includes： Power system constraints, pneumoelectric coupling constraint condition and natural gas system constraints.

10. system according to claim 9, it is characterised in that the power system constraints includes：Electric power networks are put down Weighing apparatus constraint, Line Flow constraint, the active bound constraint of exerting oneself of unit；

The electric power networks Constraints of Equilibrium is：

$\underset{i=1}{\overset{NG}{\&Sigma;}}{P}_{i,t}+\underset{j=1}{\overset{NC}{\&Sigma;}}{P}_{j,t}=P_{D,t};$

Wherein, P_D,tFor t system total load, NC is Gas Generator Set number, P_j,tFor Gas Generator Set generated output；

The Line Flow is constrained to：

|P_b,t|≤P_b·max；

Wherein, P_b,tFor branch road b t effective power flow, P_b·maxFor the branch road b effective power flow upper limits；

The active bound of exerting oneself of the unit is constrained to：

$\left\{\begin{array}{c}{P}_{i\&CenterDot;\min }\&le;P_{i,t}\&le;P_{i\&CenterDot;\max }\\ P_{j\&CenterDot;\min }\&le;P_{j,t}\&le;P_{j\&CenterDot;\max }\end{array}\right.;$

Wherein, P_i·max、P_i·minFor the active bounds of exerting oneself of coal unit i, P_j·max、P_j·minOn exerting oneself for Gas Generator Set j is active Lower limit.