CN109685291A - Based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago - Google Patents
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Abstract
The invention discloses a kind of based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, firstly, establishing each subsystem of regional complex energy resource system scheduling model a few days ago；Then, using energy hub by each subsystems couple together, set up regional complex energy resource system scheduling model a few days ago；Then, by second order cone optimization algorithm domain integrated energy system dispatch a few days ago provide multiple forms of energy to complement each other in the way of；Finally, utilizing the correctness and validity of the proposed method of Example Verification.The present invention considers the regional complex energy resource system provided multiple forms of energy to complement each other optimizing scheduling analysis method a few days ago, provides support for the optimization operation of regional complex energy resource system.
Description
Technical field
The invention belongs to integrated energy system fields more particularly to a kind of based on the regional complex energy resource system provided multiple forms of energy to complement each other
Method for optimization analysis a few days ago.
Background technique
The transition of clean energy low-carbon is the inexorable trend of global energy development.Energy transition is the system engineering of socialization,
Its basic task is the new energy system of building cleaning, low-carbon, and fundamental way is electrified again.In terms of production link, then electricity
Gasification is presented as large-scale developing and utilizing for the new energy such as wind-powered electricity generation, solar power generation；In terms of consumptive link, then electrification is presented as
Electric energy substitutes the depth of fossil energy.Intermittence, the fluctuation feature of new energy determine it is extensive, grid-connected at high proportion after,
Significant challenge will be brought to power network safety operation, many-sided synthesis is needed to apply plan, one will reinforce power grid infrastructure construction,
Expansion is interconnected, and is built bulk power grid, is formed big market；Two will carry out accurate policy and market design, realize effective
Guidance and excitation；Three will accelerate the breakthrough of important technical combined type, such as extensive energy storage and power grid friendly wind-powered electricity generation field technology；Four
It pushes user's depth to participate in system to adjust, realizes that entire society and the energy resource system efficient coupling in a manner of wisdom are run.
Accelerating The Construction energy internet is the only way for pushing clean energy transition.Energy internet is characterized in electricity
Centered on, net be platform, intelligent interconnection, " two substitution " (cleaning substitution and electric energy substitution).Compared with traditional power grid, the energy is mutual
Networking is the configuration platform for promoting clean energy resource to large-scale develop and utilize, and is that new technology, new model, new industry situation is supported to continue to bring out
Innovation platform, be the marketing platform realized different subjects close friend interaction, meet user diversification energy demand.Therefore,
Important carrier of the integrated energy system as energy internet carries out the optimization operation for the regional complex energy resource system provided multiple forms of energy to complement each other
Study it is extremely urgent, to regional complex energy resource system carry out Top-layer Design Method, the optimization of operating cost can be reached, to build
At high quality, high yield, sustainable energy resource system, it is of great significance to the construction of thrust zone integrated energy system.
Summary of the invention
Goal of the invention: in view of the above problems, the present invention propose it is a kind of based on the regional complex energy resource system day provided multiple forms of energy to complement each other
Preceding method for optimization analysis provides support for the optimization operation of regional complex energy resource system.
Technical solution: to achieve the purpose of the present invention, the technical scheme adopted by the invention is that: one kind is based on providing multiple forms of energy to complement each other
Regional complex energy resource system method for optimization analysis a few days ago, comprising steps of
(1) each subsystem of regional complex energy resource system scheduling model a few days ago is established；
(2) it establishes energy hub and dispatches steady-state model a few days ago；
(3) regional complex energy resource system objective function is established；
(4) second order cone optimization algorithm domain integrated energy system is utilized；
(5) equation of providing multiple forms of energy to complement each other of domain integrated energy system.
The step (1) includes:
(1.1) it establishes electric system and dispatches steady-state model a few days ago；
(1.2) it establishes natural gas system and dispatches steady-state model a few days ago；
(1.3) it establishes photovoltaic system and dispatches steady-state model a few days ago.
In the step (1.1), for the power equation of radial distribution networks trend scheduling model a few days ago are as follows:
In formula,WithRespectively t-th of period of whole day active power and reactive power for flowing through branch ij head end, I are
T-th of period of whole day flows through the electric current of branch ij, RijAnd XijThe respectively resistance of branch ij and reactance, a (j) are using j as periproct
Point first node set, b (j) be using j as the periproct point set of first node,WithRespectively inject the active power of node j
And reactive power.
In the step (1.2), the flow equation of turbulent flow complete for high pressure gas net in natural gas system are as follows:
Wherein:
In formula,For the flow of pipeline k, SmnFor pipeline flow direction,WithRespectively the pressure of node m and n, ε are
Pipeline efficiency factor, T0For normal temperature, DkFor the internal diameter of pipeline k, π0For normal pressure, G is gas relative density, LkFor pipe
The length of road k, TkaFor the mean temperature of pipeline k, ZaFor the mean compression factor of pipeline k.
In the step (1.3), the inverter constraint of photovoltaic system be may be expressed as:
In formula,WithRespectively the photovoltaic system active power of access node j and reactive power, SPV,iFor PV system
System inverter maximum capacity.
In the step (2), energy hub turns gas four by power transformer, miniature gas turbine, gas fired-boiler and electricity
Partial devices are constituted, coupled relation are as follows:
In formula,WithThe respectively electric load and thermic load of energy hub supply；It is distributed for P2G and is,ηTFor transformer efficiency；ηP2GFor P2G transfer efficiency；For natural gas distribution coefficient, WithRespectively natural gas passes through the transfer efficiency that MT is converted to electric energy and thermal energy；ηGBFor the efficiency of GB；WithRespectively EH
With the energetic interaction value of EPS and NGS.
In the step (3), with the minimum objective function of the total operating cost of regional complex energy resource system, including from higher level
The electric cost of power grid purchase and the gas cost bought from gas well, it may be assumed that
In formula, Δ t is scheduling duration；T is dispatching cycle；For from the power purchase price of higher level's power grid Q；gqFor from gas well q
Buy the price of natural gas；For the electricity bought from higher level's power grid；For the amount of natural gas of consumption.
In the step (4), new variable is introducedBetween the relaxation of regional complex energy resource system
Gap meets:
In formula,Respectively electric system, natural gas system relaxation gap；ε1、ε2For relaxation clearance requirement.
The utility model has the advantages that the present invention analyzes the regional complex energy being made of electric system, natural gas system and energy hub
Source system studies its operation mechanism and establishes regional complex energy resource system and dispatches steady-state model a few days ago；To regional complex energy system
System carries out Top-layer Design Method, can reach the optimization of operating cost, to build up high quality, high yield, the sustainable energy
System.
Present invention combined programming on MATLAB and YALMIP platform solves area using MOSEK second order cone optimization solver
It is a few days ago excellent to obtain the regional complex energy resource system for considering to provide multiple forms of energy to complement each other for the Operation Mode Optimization of providing multiple forms of energy to complement each other of domain integrated energy system
Change analysis method, provides support for the optimization operation of regional complex energy resource system.
Detailed description of the invention
Fig. 1 is that the present invention is based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis flow charts a few days ago；
Fig. 2 is PV power of embodiment of the present invention consumption situation；
Fig. 3 is energy hub distribution coefficient of the embodiment of the present invention.
Specific embodiment
Further description of the technical solution of the present invention with reference to the accompanying drawings and examples.
As shown in Figure 1, it is of the present invention based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago,
Electrical interconnection integrated energy system optimal energy stream is solved using second order cone optimization algorithm, specifically according to the following steps:
(1) each subsystem of regional complex energy resource system scheduling model a few days ago is established；
(1.1) it establishes electric system and dispatches steady-state model a few days ago；
For the power equation of radial distribution networks trend scheduling model a few days ago are as follows:
In formula,WithRespectively t-th of period of whole day active power and reactive power for flowing through branch ij head end；I is
T-th of period of whole day flows through the electric current of branch ij；RijAnd XijThe respectively resistance of branch ij and reactance；A (j) is using j as periproct
The first node set of point, b (j) are using j as the periproct point set of first node.
In formula,WithRespectively inject the active power and reactive power of node j:
In formula,WithRespectively the photovoltaic system active power of access node j and reactive power；WithPoint
Not Wei load active power and reactive power；For adjustable condenser compensation reactive power,For static var compensation
Repay the reactive power of device compensation.
The voltage and current of branch ij may be expressed as:
In formula,WithThe respectively voltage of node i and j.
(1.2) it establishes natural gas system and dispatches steady-state model a few days ago；
Turbulent flow complete for high pressure gas net in natural gas system, flow equation can approximate representations are as follows:
Wherein:
In formula,For the flow of pipeline k；SmnFor pipeline flow direction；WithThe respectively pressure of node m and n；ε is
Pipeline efficiency factor；T0For normal temperature；DkFor the internal diameter of pipeline k；π0For normal pressure；G is gas relative density；LkFor pipe
The length of road k；TkaFor the mean temperature of pipeline k；ZaFor the mean compression factor of pipeline k.
The flow of natural gas need to make up pressure damage because there are energy loss in pipeline transmission process using pressurizing point
It loses.The fuel driven pressurizing point operation that pressurizing point p herein is drawn from natural gas network using gas turbine consumption, consumption
Natural gas flow are as follows:
Wherein:
In formula, αp,βp,γpTo consume gas discharge conversion coefficient；For the power of driving pressurizing point consumption；Bp
For coefficient related with compressor temperature, efficiency；For the flow for flowing through pressurizing point；ZpFor Gas Compression Factor；RpTo add
The ratio of pressure station pressure at two ends, is set as constant herein.
The flux balance equations of each node in NGS are as follows:
(A+U) τ=0 f+w-T
In formula, f is bypass flow vector；W is that the gas of each node injects vector；τ is each compressor consumed flow vector；
A is branch node incidence matrix, indicates the contact of pipeline and node；U is machine group node incidence matrix, indicates unit and node
Contact；T is compressor node incidence matrix, the contact of compressor and node.
The stable operation of NGS system further includes natural gas supply constraint, node pressure constraint, pipeline transmission constraint and pressurization
It stands constraint, it may be assumed that
In formula,WithRespectively gas well q minimum and maximum air demand；WithRespectively natural gas node m
Minimum and maximum pressure；WithThe minimum and maximum gas discharge that respectively pipeline k is allowed to flow through；With
The respectively pressure ratio of pressurizing point p minimum and maximum.
(1.3) it establishes photovoltaic system and dispatches steady-state model a few days ago；
The inverter constraint of photovoltaic system may be expressed as:
In formula,WithRespectively the photovoltaic system active power of access node j and reactive power；SPV,iFor PV system
System inverter maximum capacity.
(2) it establishes energy hub and dispatches steady-state model a few days ago；
Energy hub turns four, gas (P2G) by power transformer, miniature gas turbine (MT), gas fired-boiler (GB) and electricity
Separating device is constituted, coupled relation are as follows:
In formula,WithThe respectively electric load and thermic load of energy hub supply；It is distributed for P2G and is,ηTFor transformer efficiency；ηP2GFor P2G transfer efficiency；For natural gas distribution coefficient, WithRespectively natural gas passes through the transfer efficiency that MT is converted to electric energy and thermal energy；ηGBFor the efficiency of GB；WithRespectively EH
With the energetic interaction value of EPS and NGS.
P2G technology provides a kind of new approaches for the peak load shifting of consumption new energy and power grid, realizes the gentle net of power grid
Between energy two-way flow.P2G is mainly made of following two process.
1, water electrolysis is generated into hydrogen and oxygen；
The hydrogen that electrolysis generates can be utilized directly, but hydrogen store and transmit it is relatively difficult, it is general using natural gas
Form storage.
2, carbon dioxide and hydrogen react at high temperature generates methane；
CO2+4H2→CH4+2H2O
Natural gas has higher unit intensity compared with hydrogen, can be directly injected into existing natural gas network and be deposited on a large scale
Storage and remote transmission.
The power of P2G input and the gas discharge of output may be expressed as:
In formula,The gas discharge inputted for P2G device in natural gas system node m；SHHVFor synthetic natural gas
High heating value.
(3) regional complex energy resource system objective function is established；
With the minimum objective function of the total operating cost of regional complex energy resource system comprising the electricity bought from higher level's power grid
Cost and the gas cost bought from gas well, it may be assumed that
In formula, Δ t is scheduling duration；T is dispatching cycle；For from the power purchase price of higher level's power grid Q；gqFor from gas well q
Buy the price of natural gas；For the electricity bought from higher level's power grid；For the amount of natural gas of consumption.
(4) second order cone analysis of optimization calculating domain integrated energy system is utilized；
(4.1) for electric system, new variable is introduced:
Can be convex by non-convex electric power system model relaxation scaling:
To guarantee that relaxation is tightly, to set up equal sign, need to introduce cut set, expression formula are as follows:
In formula, iter is the number of iterations；For upper suboptimization known quantity；Suboptimization waits asking thus
Amount.
For the accuracy of verifying electric system second order cone relaxation, EPS relaxation gap is introduced are as follows:
(4.2) can be convex by non-convex natural gas system model relaxation scaling for natural gas system:
Copy electric system relaxation be it is tight, introduce the cut set of natural gas system are as follows:
In formula,WithFor upper suboptimization known quantity；Suboptimization amount to be asked thus.
For the accuracy of verifying natural gas system second order cone relaxation, natural gas system relaxation gap is introduced are as follows:
(4.3) for energy hub, intermediate variable λ is introducedt,By nonlinear energy line concentration
Device model conversion is linear model:
Wherein:
In formula, λtFor intermediate variable, For the power for injecting power transformer；For injection
The power of MT and GB；WithRespectively P2G device outputs and inputs power.
(5) equation of providing multiple forms of energy to complement each other of domain integrated energy system exports result.
Since second order cone optimization algorithm has solving speed fast, and the advantage that optimal solution is unique.Therefore, the present invention uses two
Rank is bored optimization algorithm and is solved, and the combined programming on MATLAB and YALMIP platform is asked using the second order cone optimization solver of MOSKE
The Operation Mode Optimization of providing multiple forms of energy to complement each other that solution regional complex energy resource system is dispatched a few days ago, attainable region domain integrated energy system minimum operation
Cost.
Using 33 node power distribution net system of IEEE and 15 node system of natural gas in specific embodiment, and utilize 4 energy
Coupling between hub carry out system；4 energy hubs node 3 with 33 node power distribution net system of IEEE respectively, 18,23,
32 and natural gas system node 3,4,13,14 connect.
Photovoltaic system is accessed in the node 3,18,23,32 of 33 system of IEEE；Node 6 accesses capacitor, every group of power
300kvar, totally two groups；Node 17,23,31 accesses Static Var Compensator, and working range is that -200kvar arrives 700kvar.
The stopping criterion for iteration that electric system and natural gas system is arranged is 1 × 10-5.The present embodiment power purchase price uses
Time-of-use tariffs, power purchase price in different time periods is different, i.e. and 00:00~07:00 is 0.49 yuan/(kWh), 07:00~17:00
With 22:00~24:00 be 0.74 yuan/(kWh), 17:00~22:00 be 0.98 yuan/(kWh)；Gas well 1 is 2.7 yuan/m3,
Gas well 2 is 2.97 yuan/m3。
As shown in Fig. 2, optical phenomenon is abandoned since power line transmission constraint, power system stability operation exist, and region is comprehensive
Closing energy resource system can maximally utilise under conditions of meeting power line transmission constraint, power system stability operation
Photovoltaic power generation improves the utilization rate of renewable energy.As shown in Figure 3, the results showed that due to time-of-use tariffs, regional complex
Energy resource system dispatches tendency when electricity price is high using natural gas power a few days ago, and coal electricity is used when electricity price is low.
Claims (8)
1. a kind of based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, which is characterized in that comprising steps of
(1) each subsystem of regional complex energy resource system scheduling model a few days ago is established；
(2) it establishes energy hub and dispatches steady-state model a few days ago；
(3) regional complex energy resource system objective function is established；
(4) second order cone optimization algorithm domain integrated energy system is utilized；
(5) equation of providing multiple forms of energy to complement each other of domain integrated energy system.
2. it is according to claim 1 based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, it is special
Sign is that the step (1) includes:
(1.1) it establishes electric system and dispatches steady-state model a few days ago；
(1.2) it establishes natural gas system and dispatches steady-state model a few days ago；
(1.3) it establishes photovoltaic system and dispatches steady-state model a few days ago.
3. it is according to claim 2 based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, it is special
Sign is, in the step (1.1), for the power equation of radial distribution networks trend scheduling model a few days ago are as follows:
In formula,WithRespectively t-th of period of whole day active power and reactive power for flowing through branch ij head end, I are whole day the
T period flows through the electric current of branch ij, RijAnd XijThe respectively resistance of branch ij and reactance, a (j) are using j as the head of tail node
Node set, b (j) be using j as the periproct point set of first node,WithRespectively inject the active power of node j and idle
Power.
4. it is according to claim 2 based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, it is special
Sign is, in the step (1.2), the flow equation of turbulent flow complete for high pressure gas net in natural gas system are as follows:
Wherein:
In formula,For the flow of pipeline k, SmnFor pipeline flow direction,WithThe respectively pressure of node m and n, ε are pipeline
Efficiency factor, T0For normal temperature, DkFor the internal diameter of pipeline k, π0For normal pressure, G is gas relative density, LkFor pipeline k's
Length, TkaFor the mean temperature of pipeline k, ZaFor the mean compression factor of pipeline k.
5. it is according to claim 2 based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, it is special
Sign is, in the step (1.3), the inverter constraint of photovoltaic system be may be expressed as:
In formula,WithRespectively the photovoltaic system active power of access node j and reactive power, SPV,iIt is inverse for PV system
Become device maximum capacity.
6. it is according to claim 1 based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, it is special
Sign is that in the step (2), energy hub turns four, gas by power transformer, miniature gas turbine, gas fired-boiler and electricity
Separating device is constituted, coupled relation are as follows:
In formula,WithThe respectively electric load and thermic load of energy hub supply；It is distributed for P2G and is,
ηTFor transformer efficiency；ηP2GFor P2G transfer efficiency；For natural gas distribution coefficient, WithRespectively
Natural gas is converted to the transfer efficiency of electric energy and thermal energy by MT；ηGBFor the efficiency of GB；WithRespectively EH and EPS and NGS
Energetic interaction value.
7. it is according to claim 1 based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, it is special
Sign is, in the step (3), with the minimum objective function of the total operating cost of regional complex energy resource system, including from higher level
The electric cost of power grid purchase and the gas cost bought from gas well, it may be assumed that
In formula, Δ t is scheduling duration；T is dispatching cycle；For from the power purchase price of higher level's power grid Q；gqTo buy day from gas well q
The price of right gas；For the electricity bought from higher level's power grid；For the amount of natural gas of consumption.
8. it is according to claim 1 based on the regional complex energy resource system provided multiple forms of energy to complement each other method for optimization analysis a few days ago, it is special
Sign is, in the step (4), introduces new variableBetween the relaxation of regional complex energy resource system
Gap meets:
In formula,Respectively electric system, natural gas system relaxation gap；ε1、ε2For relaxation clearance requirement.
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| CN110717633A (en) * | 2019-10-21 | 2020-01-21 | 国网重庆市电力公司电力科学研究院 | Electric power and natural gas energy complementary optimization method and device and readable storage medium |
| CN110807588A (en) * | 2019-10-31 | 2020-02-18 | 国网河南省电力公司经济技术研究院 | Optimized scheduling method of multi-energy coupling comprehensive energy system |
| CN111210107A (en) * | 2019-12-19 | 2020-05-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Comprehensive energy scheduling system and comprehensive energy scheduling method |
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| CN110717633A (en) * | 2019-10-21 | 2020-01-21 | 国网重庆市电力公司电力科学研究院 | Electric power and natural gas energy complementary optimization method and device and readable storage medium |
| CN110807588A (en) * | 2019-10-31 | 2020-02-18 | 国网河南省电力公司经济技术研究院 | Optimized scheduling method of multi-energy coupling comprehensive energy system |
| CN111210107A (en) * | 2019-12-19 | 2020-05-29 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Comprehensive energy scheduling system and comprehensive energy scheduling method |
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Application publication date: 20190426 |