CN107800158B - A kind of economy of taking into account couples multipotency streaming system Optimization Scheduling with the electric-thermal of efficiency - Google Patents
A kind of economy of taking into account couples multipotency streaming system Optimization Scheduling with the electric-thermal of efficiency Download PDFInfo
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Abstract
The present invention proposes that a kind of economy of taking into account couples multipotency streaming system Optimization Scheduling with the electric-thermal of efficiency, belongs to the operation of power networks and control technology field of the form containing various energy resources.This method sets the equation and inequality constraints condition of power grid and heat supply network steady state Safe Operation in electric-thermal coupling multipotency streaming system first；The economy objectives function and energetic efficiency objectives function of electric-thermal coupling multipotency streaming system Optimized Operation are established respectively；The scheduling scheme using economy as target is acquired respectively, and using efficiency as the scheduling scheme of target；Two schemes are substituted into corresponding objective function respectively and interact calculating, economy is taken into account using calculated result foundation and couples multipotency streaming system Optimal Operation Model with the electric-thermal of efficiency；To model solution, the final Optimized Operation scheme for obtaining electric-thermal coupling multipotency streaming system.The present invention consider electric-thermal system close-coupled with influence each other, realize and take into account the Optimized Operation that economy couples multipotency streaming system with the electric-thermal of efficiency.
Description
Technical Field
The invention relates to an electric-thermal coupling multi-energy flow system optimal scheduling method giving consideration to economy and energy efficiency, and belongs to the technical field of operation and control of power grids containing multiple energy forms.
Background
The multi-energy flow system is an important carrier of an energy internet, and deeply fuses sources, networks and loads of various types of energy such as cold, heat, electricity, gas and the like in the process of design, operation and management, and performs multi-energy cooperative optimization in a series of links such as production, transmission, conversion, storage and consumption. Compare the energy system that tradition was split each other, through the multipotency in coordination, the benefit that multipotency stream system brought includes: 1) through the cascade development and utilization and intelligent management of the multi-type energy, the energy consumption and waste can be reduced, the comprehensive energy utilization efficiency is improved, and the total energy utilization cost is reduced; 2) the characteristic difference, complementation and conversion of different energy sources are utilized, so that the capacity of consuming intermittent renewable energy sources is improved; 3) through the supply, complementation and coordination control of multiple energy sources, the reliability of energy supply is improved, and more adjustable and controllable resources are provided for the operation of a power grid; 4) through collaborative planning and construction of the multi-energy flow system, repeated construction and waste of infrastructure can be reduced, and the asset utilization rate is improved.
The multi-energy flow system has considerable benefits on one hand, and on the other hand, the originally complex energy system is more complex. The multi-energy flow system is composed of a plurality of energy flow subsystems, the interaction and influence among the energy flow subsystems enable the complexity of the multi-energy flow system to be increased remarkably, a plurality of new characteristics are embodied, the traditional method for analyzing each energy flow independently is difficult to adapt to new requirements, and a new multi-energy flow analysis method needs to be developed urgently. In China, more and more coupling elements such as a cogeneration unit, a heat pump, an electric boiler and the like objectively enhance the interconnection between electricity and heat, promote the development of an electricity-heat coupling multi-energy flow system and also provide new requirements for the operation and control technology of the electricity-heat coupling multi-energy flow system.
The optimal scheduling of the multi-energy system refers to that when structural parameters and load conditions of the system are given, available control variables (such as output power of a generator in a power grid, lift of a pump in a heat grid and the like) are adjusted to find load flow distribution which can meet all operation constraint conditions and enable certain performance indexes (such as total operation cost or network loss) of the system to reach an optimal value. The current research is mainly focused on a single independent system, and mostly only focuses on the economy of the operation of the multi-energy flow system, so that in order to respond to the central requirement for improving the energy utilization efficiency, promoting the energy production and energy consumption, and fully exerting the advantage of the cascade utilization of the energy of the multi-energy flow system, an electric-thermal coupling multi-energy flow system optimal scheduling method considering both economy and energy efficiency needs to be researched.
Disclosure of Invention
The invention aims to make up for the blank of the prior art and provides an optimal scheduling method of an electric-thermal coupling multi-energy flow system, which gives consideration to economy and energy efficiency. According to the invention, the economical and efficient operation of the electro-thermal coupling multi-energy flow system is realized by establishing the optimal scheduling model of the electro-thermal coupling multi-energy flow system which gives consideration to economy and energy efficiency, and the practical value is very high.
The invention provides an electric-thermal coupling multi-energy flow system optimal scheduling method giving consideration to economy and energy efficiency, which comprises the following steps:
the invention provides an electric-thermal coupling multi-energy flow system optimal scheduling method giving consideration to economy and energy efficiency, which is characterized by comprising the following steps of:
1) setting an equality constraint condition of steady-state safe operation of a power grid and a heat supply network in the electric-thermal coupling multi-energy flow system; the method specifically comprises the following steps:
1-1) power grid flow equation constraints in an electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein, PiInjecting active power, Q, for node i in the gridiInjecting reactive power, theta, for node i in the gridi、θjThe voltage phase angles of the node i and the node j, UiAnd UjVoltage amplitudes, G, of nodes i and j, respectivelyijIs the real part of the ith row and jth column elements of the grid node admittance matrix Y, BijFor the imaginary part of the ith row and jth column element of the grid node admittance matrix Y；
1-2) pipeline pressure loss constraint of a heat supply network in an electro-thermal coupling multi-energy flow system; the expression is as follows:
ΔHl＝Slml|ml| (2)
wherein, Δ HlFor the pressure loss of the first pipe in the heat network, SlIs the resistance characteristic coefficient of the first pipeline, 10Pa/(kg/s)2≤Sl≤500Pa/(kg/s)2，mlThe flow rate of the first pipeline is;
1-3) the hydraulic characteristic constraint of a circulating pump of a heat supply network in the electro-thermal coupling multi-energy flow system; the expression is as follows:
HP＝H0-Spm2 (3)
wherein HPFor circulating pump head, H0Is the static lift of the circulating pump SpIs the resistance coefficient of the circulating pump, and m is the flow rate flowing through the circulating pump;
1-4) heat loss constraint of a heat pipe in an electric-thermal coupling multi-energy flow system; the expression is as follows:
wherein, Te,lIs the end temperature, T, of the first pipe in the heat supply networkh,lIs the head end temperature, T, of the first pipelinea,lIs the ambient temperature of the first pipeline, LlLength of the first pipe, CpIs the specific heat capacity of water, and lambda is the heat transfer coefficient of the unit length of the pipeline;
1-5) temperature constraint of a multi-pipeline junction in a heat supply network of an electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein,to the flow out of the multi-channel junction,for flows into a multi-pipe junction, ToutTemperature of water flowing out of a junction of multiple pipes, TinFor the temperature of the water flowing into the junction of the pipes, QJIs the thermal power of the multi-channel junction;
1-6) coupling constraint between a power grid and a heat supply network in an electric-thermal coupling multi-energy flow system coupled by an electric-thermal combined supply unit; expression:
wherein P is the active power of the electricity-heat cogeneration unit, q is the thermal power of the electricity-heat cogeneration unit, and PkOperating the abscissa, Q, of the k-th vertex of the feasible region approximation polygon for the combined heat and power plantkFor the combined heat and power plant, the ordinate of the k-th vertex of the polygon of the feasible region, αkIn order to combine the coefficients of the coefficients,NK is the number of vertexes of an approximate polygon of an operation feasible region of the electricity-heat cogeneration unit;
1-7) coupling constraint between a power grid and a heat supply network in an electric-thermal coupling multi-energy flow system coupled through a circulating pump; expression:
wherein, PPActive power consumed for the circulation pump, g is acceleration of gravity, ηPFor the efficiency of the circulation pump, mPFor the flow rate through the circulating pump, HPThe lift of the circulating pump;
1-8) coupling constraints between the power grid and the heat supply network in an electro-thermal coupling multi-energy flow system coupled by a heat pump; the expression is as follows:
Php＝ChpQhp (8)
wherein Q ishpFor the thermal power, P, generated by a heat pump in an electro-thermally coupled multi-energy flow systemhpElectric power consumed for heat pumps, ChpThe heat generating efficiency of the heat pump;
2) the method for setting the inequality constraint conditions of steady-state safe operation of the power grid and the heat supply network in the electric-thermal coupling multi-energy flow system specifically comprises the following steps:
2-1) node voltage amplitude constraint;
voltage amplitude U of ith node in power grid of electric-thermal coupling multi-energy flow systemiLower and upper limit values of set safe operation voltage of power gridU i、In the middle of the operation, the operation is carried out,U iis 0.95 times the rated voltage of the ith node,1.05 times of rated voltage of the ith node: the expression is as follows:
2-2) line transmission capacity constraints;
transmission of the l-th line in the electrical network of an electro-thermally coupled multi-energy flow systemThe capacity is less than or equal to the maximum value of the set safe operation transmission capacity of the power gridThe expression is as follows:
2-3) climbing constraint of an electricity-heat combined supply unit or active power in a power grid of the electricity-heat combined multi-energy flow system; the expression is as follows:
wherein,andrespectively the upward climbing speed and the downward climbing speed of the active power of the b-th station electric-heat combined supply unit, wherein delta t is the time interval of two adjacent scheduling periods, pb,tAnd pb,t-1Respectively setting the active power of the b-th electric-thermal cogeneration unit in the t-th scheduling period and the active power of the t-1-th scheduling period;
2-4) climbing constraint of active power of a non-gas turbine set in a power grid of the electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein,andthe upward climbing speed and the downward climbing speed, p, of the active power of the x-th thermal power generating unitx,tAnd px,t-1Respectively setting the active power of the x-th thermal power generating unit in the t-th scheduling period and the active power of the t-1 st scheduling period;
2-5) restraining the safe operation of the electricity-heat cogeneration unit;
active power p of the b-th electric-thermal combined supply unit in the power grid of the electric-thermal coupling multi-energy flow systembThe upper limit value and the lower limit value of the active power of the b-th station electric-heat cogeneration unit are safely operated in the set power grid p bTo (c) to (d); the expression is as follows:
2-6) safety operation constraint of the thermal power generating unit;
active power p of x-th thermal power generating unit in power grid of electric-thermal coupling multi-energy flow systemxUpper and lower limit values of active power of x-th thermal power generating unit in set power grid safe operation p xTo (c) to (d); the expression is as follows:
2-7) heat supply network pipeline flow restriction;
flow of the first pipeline in the heat supply network of an electro-thermally coupled multi-energy flow systemQuantity mlIs less than or equal to the upper limit value of the safe operation flow of the heat supply networkThe expression is as follows:
2-8) restricting the return water temperature of the heat exchange station;
the return water temperature T of the heat exchange station in the heat supply network of the electric-thermal coupling multi-energy flow system is at the upper limit value and the lower limit value of the set safe operation return water temperature of the heat supply network TTo (c) to (d); the expression is as follows:
3) establishing an economic objective function of optimal scheduling of the electro-thermal coupling multi-energy flow system by taking the lowest cost as a target; the expression is as follows:
wherein p isbThe active power of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system, qbThe thermal power of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system is provided, N is the total number of the electric-thermal combined supply units in the electric-thermal coupling multi-energy flow system, and F (p)b,qb) The running cost p of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow systemxIs the active power of the x-th thermal power generating unit in an electric-thermal coupling multi-energy flow system, NTUFor electro-thermal coupling of multiple energy flowsTotal number of thermoelectric units in the system, FTU(px) The operation cost of the x-th thermal power generating unit in the electro-thermal coupling multi-energy flow system is calculated;the total operating cost of the multi-energy flow system;
4) establishing an energy efficiency objective function for optimal scheduling of the electric-thermal coupling multi-energy flow system by taking the highest energy efficiency as a target, wherein the expression is as follows:
wherein, PL(t)、CL(t)、QL(t) the electric load power, the cold load power and the heat load power of the multi-energy-flow system at the time t, subscript re, coal and gass respectively represent that the energy sources are renewable energy, coal and natural gas, ξ is an energy non-renewable coefficient, the value is 0 for the renewable energy, the non-renewable energy is 1, v (t) is the permeability of different primary energy sources in electricity purchase outside the time t, ef is the generating efficiency of a corresponding unit, P is the power generation efficiency of the corresponding unit, andbuy(t) purchasing electric energy power of a power grid for the multi-energy-flow system at the time t; pre(t) the renewable energy power which is accessed by the multi-energy-flow system at the time t without a power grid is in kW unit; f (t) is the lower heating value of the corresponding fuel consumed,energy efficiency for a multi-energy flow system;
5) an internal point method is adopted, an economic objective function of a formula (17) is used as an objective function, formulas (1) to (16) are used as constraint conditions, active power and thermal power of each electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system are obtained through solving, and an electric-thermal coupling multi-energy flow system scheduling scheme taking economy as a target is obtained;
an internal point method is adopted, an energy efficiency objective function of a formula (18) is used as an objective function, formulas (1) to (16) are used as constraint conditions, active power and thermal power of each electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system are obtained through solving, and an electric-thermal coupling multi-energy flow system scheduling scheme with energy efficiency as a target is obtained;
6) substituting the electric-thermal coupling multi-energy flow system scheduling scheme which is obtained in the step 5) and aims at the economy into an energy efficiency objective function of an equation (18), and recording the result as the resultSubstituting the electric-thermal coupling multi-energy flow system scheduling scheme which is obtained in the step 5) and aims at energy efficiency into an economic objective function of an equation (17), and recording the result as
7) Establishing an electric-thermal coupling multi-energy flow system optimization scheduling objective function which gives consideration to economy and energy efficiency; the expression is as follows:
8) establishing an electric-thermal coupling multi-energy flow system optimization scheduling model considering economy and energy efficiency by taking the formula (19) as an objective function and taking the formulas (1) to (16) as constraint conditions; and solving the model by adopting an interior point method to obtain the active power and the thermal power of each electro-thermal coupling unit in the electro-thermal coupling multi-energy flow system, and using the active power and the thermal power as an optimal scheduling scheme of the electro-thermal coupling multi-energy flow system.
The invention provides an electric-thermal coupling multi-energy flow system optimal scheduling method giving consideration to economy and energy efficiency, which has the characteristics and effects that:
the method considers the close coupling and the mutual influence of the electric-thermal system, and realizes the optimal scheduling of the electric-thermal coupling multi-energy flow system which gives consideration to economy and energy efficiency. Compared with the independent optimization scheduling analysis considering the economy of the electric and thermal systems, the method not only realizes the cooperative optimization of the electric and thermal systems, but also considers the operation economy and the high efficiency of the electric-thermal coupling multi-energy flow system. The method can be applied to the scheduling plan formulation of the electro-thermal coupling multi-energy flow system, is beneficial to reducing the operation cost and simultaneously improves the energy utilization efficiency of the electro-thermal coupling multi-energy flow system.
Detailed Description
The invention provides an electric-thermal coupling multi-energy flow system optimal scheduling method giving consideration to economy and energy efficiency, which is further described in detail below by combining specific embodiments.
The invention provides an electric-thermal coupling multi-energy flow system optimal scheduling method giving consideration to economy and energy efficiency, which comprises the following steps:
1) setting an equality constraint condition of steady-state safe operation of a power grid and a heat supply network in the electric-thermal coupling multi-energy flow system; the method specifically comprises the following steps:
1-1) power grid flow equation constraints in an electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein, PiInjecting active power, Q, for node i in the gridiInjecting reactive power, theta, for node i in the gridi、θjThe voltage phase angles of the node i and the node j, UiAnd UjVoltage amplitudes, G, of nodes i and j, respectivelyijIs the real part of the ith row and jth column elements of the grid node admittance matrix Y, BijObtaining imaginary parts of ith row and jth column elements of a power grid node admittance matrix Y from an energy management system of the electro-thermal coupling multi-energy flow system;
1-2) pipeline pressure loss constraint of a heat supply network in an electro-thermal coupling multi-energy flow system; the expression is as follows:
ΔHl＝Slml|ml| (2)
wherein, Δ HlFor the pressure loss of the first pipe in the heat network, SlIs the coefficient of the resistance characteristic of the first pipe, SlThe value range is 10Pa/(kg/s)2≤Sl≤500Pa/(kg/s)2，mlThe flow rate of the first pipeline is;
1-3) the hydraulic characteristic constraint of a circulating pump of a heat supply network in the electro-thermal coupling multi-energy flow system; the expression is as follows:
HP＝H0-Spm2 (3)
wherein HPFor circulating pump head, H0Is the static lift of the circulating pump SpIs the coefficient of resistance of the circulating pump, H0And SpThe flow rate is obtained by a delivery specification of the circulating pump, and m is the flow rate flowing through the circulating pump;
1-4) heat loss constraint of a heat pipe in an electric-thermal coupling multi-energy flow system; the expression is as follows:
wherein, Te,lIs the end temperature, T, of the first pipe in the heat supply networkh,lIs the head end temperature, T, of the first pipelinea,lM is the ambient temperature of the first pipelIs the flow rate of the first pipeline, LlLength of the first pipe, CpThe specific heat capacity of water is 4182 joules/(kilogram-degree centigrade), lambda is the heat transfer coefficient of the unit length of the pipeline, and lambda is obtained from an energy management system of the electro-thermal coupling multi-energy flow system;
1-5) temperature constraint of a multi-pipeline junction in a heat supply network of an electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein,to the flow out of the multi-channel junction,for flow into a multi-pipe junction, ToutTemperature of water flowing out of a junction of multiple pipes, TinFor the temperature of the water flowing into the junction of the pipes, QJIs the thermal power of the multi-channel junction;
1-6) coupling constraint between a power grid and a heat supply network in an electric-thermal coupling multi-energy flow system coupled by an electric-thermal combined supply unit; expression:
wherein P is the active power of the electricity-heat cogeneration unit, q is the thermal power of the electricity-heat cogeneration unit, and PkOperating the abscissa, Q, of the k-th vertex of the feasible region approximation polygon for the combined heat and power plantkFor the combined heat and power plant, the ordinate of the k-th vertex of the polygon of the feasible region, αkIn order to combine the coefficients of the coefficients,NK is the number of vertexes of an approximate polygon of the operation feasible region of the electric-thermal cogeneration unit, and the approximate polygon of the operation feasible region of the electric-thermal cogeneration unit is obtained from a delivery specification of the electric-thermal cogeneration unit;
1-7) coupling constraint between a power grid and a heat supply network in an electric-thermal coupling multi-energy flow system coupled through a circulating pump; expression:
wherein, PPActive power consumed for the circulation pump, g is acceleration of gravity, ηPFor circulation pump efficiency, ηPHas a value range of 0 to 1, mPFor the flow rate through the circulating pump, HPThe lift of the circulating pump;
1-8) coupling constraints between the power grid and the heat supply network in an electro-thermal coupling multi-energy flow system coupled by a heat pump; the expression is as follows:
Php＝ChpQhp (8)
wherein Q ishpFor the thermal power, P, generated by a heat pump in an electro-thermally coupled multi-energy flow systemhpElectric power consumed for heat pumps, ChpFor heat-generating efficiency of heat pumps, ChpObtained from the factory specifications of the heat pump;
2) the method for setting the inequality constraint conditions of steady-state safe operation of the power grid and the heat supply network in the electric-thermal coupling multi-energy flow system specifically comprises the following steps:
2-1) node voltage amplitude constraint;
voltage amplitude U of ith node in power grid of electric-thermal coupling multi-energy flow systemiLower and upper limit values of set safe operation voltage of power gridU i、In the middle of the operation, the operation is carried out,U iis 0.95 times the rated voltage of the ith node,1.05 times of rated voltage of the ith node: the expression is as follows:
2-2) line transmission capacity constraints;
the transmission capacity of the first line in the power grid of the electric-thermal coupling multi-energy flow system is less than or equal to the maximum value of the set safe operation transmission capacity of the power gridThe expression is as follows:
2-3) climbing constraint of an electricity-heat combined supply unit or active power in a power grid of the electricity-heat combined multi-energy flow system; the expression is as follows:
wherein,andrespectively the upward climbing speed and the downward climbing speed of the active power of the b-th electric-thermal cogeneration unit,andobtained from the factory specifications of the electric-thermal combined supply unit, delta t is the time interval of two adjacent scheduling time periods, pb,tAnd pb,t-1Respectively of the b-th electric-thermal cogeneration unit in the t-th scheduling periodActive power and active power of the t-1 th scheduling period;
2-4) climbing constraint of active power of a non-gas turbine set in a power grid of the electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein,andthe upward climbing speed and the downward climbing speed of the active power of the x-th thermal power generating unit are respectively,andobtained from the factory specifications of the thermal power generating unit, delta t is the time interval of two adjacent scheduling time periods, px,tAnd px,t-1Respectively setting the active power of the x-th thermal power generating unit in the t-th scheduling period and the active power of the t-1 st scheduling period;
2-5) restraining the safe operation of the electricity-heat cogeneration unit;
active power p of the b-th electric-thermal combined supply unit in the power grid of the electric-thermal coupling multi-energy flow systembThe upper limit value and the lower limit value of the active power of the b-th station electric-heat cogeneration unit are safely operated in the set power grid p bTo (c) to (d); the expression is as follows:
2-6) safety operation constraint of the thermal power generating unit;
active power p of x-th thermal power generating unit in power grid of electric-thermal coupling multi-energy flow systemxUpper and lower limit values of active power of x-th thermal power generating unit in set power grid safe operation p xTo (c) to (d); the expression is as follows:
2-7) heat supply network pipeline flow restriction;
flow m of the first pipeline in the heat supply network of the electric-thermal coupling multi-energy flow systemlIs less than or equal to the upper limit value of the safe operation flow of the heat supply networkThe expression is as follows:
2-8) restricting the return water temperature of the heat exchange station;
the return water temperature T of the heat exchange station in the heat supply network of the electric-thermal coupling multi-energy flow system is at the upper limit value and the lower limit value of the set safe operation return water temperature of the heat supply network TTo (c) to (d); the expression is as follows:
3) establishing an economic objective function of optimal scheduling of the electro-thermal coupling multi-energy flow system by taking the lowest cost as a target; the expression is as follows:
wherein p isbThe active power of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system, qbThe thermal power of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system is provided, N is the total number of the electric-thermal combined supply units in the electric-thermal coupling multi-energy flow system, and F (p)b,qb) The running cost p of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow systemxIs the active power of the x-th thermal power generating unit in an electric-thermal coupling multi-energy flow system, NTUThe total number of the thermoelectric generator sets in the electric-thermal coupling multi-energy flow system, FTU(px) The operation cost of the x-th thermal power generating unit in the electro-thermal coupling multi-energy flow system is calculated;the total operation cost of the multi-energy flow system.
4) Establishing an energy efficiency objective function for optimal scheduling of the electric-thermal coupling multi-energy flow system by taking the highest energy efficiency as a target, wherein the expression is as follows:
wherein, PL(t)、CL(t)、QL(t) the electric load power, the cold load power and the heat load power of the multi-energy flow system at the time t, subscript re, coal and gass respectively represent that the energy sources are renewable energy sources, coal and natural gas, the same applies below, ξ is the energy non-renewable coefficient, and for the renewable energy sourcesThe source value is 0 and the non-renewable energy source is 1; v (t) is the permeability (the value is between 0 and 1) of different primary energy sources in the electricity purchase outside the time t; ef is the generating efficiency of the corresponding unit; pbuy(t) purchasing electric energy power of a power grid for the multi-energy-flow system at the time t; pre(t) the renewable energy power which is accessed by the multi-energy-flow system at the time t without a power grid is in kW unit; f (t) is the lower heating value of the corresponding fuel consumed;energy efficiency for a multi-energy flow system.
5) An internal point method is adopted, an economic objective function of a formula (17) is used as an objective function, formulas (1) to (16) are used as constraint conditions, active power and thermal power of each electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system are obtained through solving, and an electric-thermal coupling multi-energy flow system scheduling scheme taking economy as a target is obtained;
an internal point method is adopted, an energy efficiency objective function of a formula (18) is used as an objective function, formulas (1) to (16) are used as constraint conditions, active power and thermal power of each electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system are obtained through solving, and an electric-thermal coupling multi-energy flow system scheduling scheme with energy efficiency as a target is obtained;
6) substituting the electric-thermal coupling multi-energy flow system scheduling scheme which is obtained in the step 5) and aims at the economy into an energy efficiency objective function of an equation (18), and recording the result as the resultSubstituting the electric-thermal coupling multi-energy flow system scheduling scheme which is obtained in the step 5) and aims at energy efficiency into an economic objective function of an equation (17), and recording the result as
7) Based on a cooperative game, establishing an electric-thermal coupling multi-energy flow system optimized dispatching objective function which gives consideration to economy and energy efficiency; the expression is as follows:
8) establishing an electric-thermal coupling multi-energy flow system optimization scheduling model considering economy and energy efficiency by taking the formula (19) as an objective function and taking the formulas (1) to (16) as constraint conditions; and solving the model by adopting an interior point method to obtain the active power and the thermal power of each electro-thermal coupling unit in the electro-thermal coupling multi-energy flow system, and using the active power and the thermal power as an optimal scheduling scheme of the electro-thermal coupling multi-energy flow system.
Claims (1)
1. An electric-thermal coupling multi-energy flow system optimal scheduling method giving consideration to economy and energy efficiency is characterized by comprising the following steps:
1) setting an equality constraint condition of steady-state safe operation of a power grid and a heat supply network in the electric-thermal coupling multi-energy flow system; the method specifically comprises the following steps:
1-1) power grid flow equation constraints in an electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein, PiInjecting active power, Q, for node i in the gridiInjecting reactive power, theta, for node i in the gridi、θjThe voltage phase angles of the node i and the node j, UiAnd UjVoltage amplitudes, G, of nodes i and j, respectivelyijIs the real part of the ith row and jth column elements of the grid node admittance matrix Y, BijAn imaginary part of an ith row element and a jth column element of the grid node admittance matrix Y is obtained;
1-2) pipeline pressure loss constraint of a heat supply network in an electro-thermal coupling multi-energy flow system; the expression is as follows:
ΔHl＝Slml|ml| (2)
wherein, Δ HlFor the pressure loss of the first pipe in the heat network, SlIs the resistance characteristic coefficient of the first pipeline, 10Pa/(kg/s)2≤Sl≤500Pa/(kg/s)2，mlThe flow rate of the first pipeline is;
1-3) the hydraulic characteristic constraint of a circulating pump of a heat supply network in the electro-thermal coupling multi-energy flow system; the expression is as follows:
HP＝H0-Spm2 (3)
wherein HPFor circulating pump head, H0Is the static lift of the circulating pump SpIs the resistance coefficient of the circulating pump, and m is the flow rate flowing through the circulating pump;
1-4) heat loss constraint of a heat pipe in an electric-thermal coupling multi-energy flow system; the expression is as follows:
wherein, Te,lIs the end temperature, T, of the first pipe in the heat supply networkh,lIs the head end temperature, T, of the first pipelinea,lIs the ambient temperature of the first pipeline, LlLength of the first pipe, CpIs the specific heat capacity of water, lambdaIs the heat transfer coefficient per unit length of the pipe;
1-5) temperature constraint of a multi-pipeline junction in a heat supply network of an electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein,to the flow out of the multi-channel junction,for flow into a multi-pipe junction, ToutTemperature of water flowing out of a junction of multiple pipes, TinFor the temperature of the water flowing into the junction of the pipes, QJIs the thermal power of the multi-channel junction;
1-6) coupling constraint between a power grid and a heat supply network in an electric-thermal coupling multi-energy flow system coupled by an electric-thermal combined supply unit; expression:
wherein P is the active power of the electricity-heat cogeneration unit, q is the thermal power of the electricity-heat cogeneration unit, and PkOperating the abscissa, Q, of the k-th vertex of the feasible region approximation polygon for the combined heat and power plantkFor the combined heat and power plant, the ordinate of the k-th vertex of the polygon of the feasible region, αkIn order to combine the coefficients of the coefficients,0≤αkNK is the number of vertexes of an approximate polygon of the operation feasible region of the electricity-heat combined supply unit, and is not more than 1;
1-7) coupling constraint between a power grid and a heat supply network in an electric-thermal coupling multi-energy flow system coupled through a circulating pump; expression:
wherein, PPActive power consumed for the circulation pump, g is acceleration of gravity, ηPFor the efficiency of the circulation pump, mPFor the flow rate through the circulating pump, HPThe lift of the circulating pump;
1-8) coupling constraints between the power grid and the heat supply network in an electro-thermal coupling multi-energy flow system coupled by a heat pump; the expression is as follows:
Php＝ChpQhp (8)
wherein Q ishpFor the thermal power, P, generated by a heat pump in an electro-thermally coupled multi-energy flow systemhpElectric power consumed for heat pumps, ChpThe heat generating efficiency of the heat pump;
2) the method for setting the inequality constraint conditions of steady-state safe operation of the power grid and the heat supply network in the electric-thermal coupling multi-energy flow system specifically comprises the following steps:
2-1) node voltage amplitude constraint;
voltage amplitude U of ith node in power grid of electric-thermal coupling multi-energy flow systemiLower and upper limit values of set safe operation voltage of power gridU i、In the middle of the operation, the operation is carried out,U iis 0.95 times the rated voltage of the ith node,1.05 times of rated voltage of the ith node: the expression is as follows:
2-2) line transmission capacity constraints;
of electro-thermally coupled multi-energy flow systemsThe transmission capacity of the first line in the power grid is less than or equal to the maximum value of the set safe operation transmission capacity of the power gridThe expression is as follows:
2-3) climbing constraint of an electricity-heat combined supply unit or active power in a power grid of the electricity-heat combined multi-energy flow system; the expression is as follows:
wherein,andrespectively the upward climbing speed and the downward climbing speed of the active power of the b-th station electric-heat combined supply unit, wherein delta t is the time interval of two adjacent scheduling periods, pb,tAnd pb,t-1Respectively setting the active power of the b-th electric-thermal cogeneration unit in the t-th scheduling period and the active power of the t-1-th scheduling period;
2-4) climbing constraint of active power of a non-gas turbine set in a power grid of the electro-thermal coupling multi-energy flow system; the expression is as follows:
wherein,andthe upward climbing speed and the downward climbing speed, p, of the active power of the x-th thermal power generating unitx,tAnd px,t-1Respectively setting the active power of the x-th thermal power generating unit in the t-th scheduling period and the active power of the t-1 st scheduling period;
2-5) restraining the safe operation of the electricity-heat cogeneration unit;
active power p of the b-th electric-thermal combined supply unit in the power grid of the electric-thermal coupling multi-energy flow systembThe upper limit value and the lower limit value of the active power of the b-th station electric-heat cogeneration unit are safely operated in the set power grid p bTo (c) to (d); the expression is as follows:
2-6) safety operation constraint of the thermal power generating unit;
active power p of x-th thermal power generating unit in power grid of electric-thermal coupling multi-energy flow systemxUpper and lower limit values of active power of x-th thermal power generating unit in set power grid safe operation p xTo (c) to (d); the expression is as follows:
2-7) heat supply network pipeline flow restriction;
flow m of the first pipeline in the heat supply network of the electric-thermal coupling multi-energy flow systemlIs less than or equal to the upper limit value of the safe operation flow of the heat supply networkThe expression is as follows:
2-8) restricting the return water temperature of the heat exchange station;
the return water temperature T of the heat exchange station in the heat supply network of the electric-thermal coupling multi-energy flow system is at the upper limit value and the lower limit value of the set safe operation return water temperature of the heat supply network TTo (c) to (d); the expression is as follows:
3) establishing an economic objective function of optimal scheduling of the electro-thermal coupling multi-energy flow system by taking the lowest cost as a target; the expression is as follows:
wherein p isbThe active power of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system, qbThe thermal power of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system is provided, N is the total number of the electric-thermal combined supply units in the electric-thermal coupling multi-energy flow system, and F (p)b,qb) The running cost p of the b-th electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow systemxIs the active power of the x-th thermal power generating unit in an electric-thermal coupling multi-energy flow system, NTUThe total number of the thermoelectric generator sets in the electric-thermal coupling multi-energy flow system, FTU(px) The operation cost of the x-th thermal power generating unit in the electro-thermal coupling multi-energy flow system is calculated;the total operating cost of the multi-energy flow system;
4) establishing an energy efficiency objective function for optimal scheduling of the electric-thermal coupling multi-energy flow system by taking the highest energy efficiency as a target, wherein the expression is as follows:
wherein, PL(t)、CL(t)、QL(t) the electric load power, the cold load power and the heat load power of the multi-energy-flow system at the time t, subscript re, coal and gass respectively represent that the energy sources are renewable energy, coal and natural gas, ξ is an energy non-renewable coefficient, the value is 0 for the renewable energy, the non-renewable energy is 1, v (t) is the permeability of different primary energy sources in electricity purchase outside the time t, ef is the generating efficiency of a corresponding unit, P is the power generation efficiency of the corresponding unit, andbuy(t) purchasing electric energy power of a power grid for the multi-energy-flow system at the time t; pre(t) the renewable energy power which is accessed by the multi-energy-flow system at the time t without a power grid is in kW unit; f (t) is the lower heating value of the corresponding fuel consumed,energy efficiency for a multi-energy flow system;
5) an internal point method is adopted, an economic objective function of a formula (17) is used as an objective function, formulas (1) to (16) are used as constraint conditions, active power and thermal power of each electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system are obtained through solving, and an electric-thermal coupling multi-energy flow system scheduling scheme taking economy as a target is obtained;
an internal point method is adopted, an energy efficiency objective function of a formula (18) is used as an objective function, formulas (1) to (16) are used as constraint conditions, active power and thermal power of each electric-thermal combined supply unit in the electric-thermal coupling multi-energy flow system are obtained through solving, and an electric-thermal coupling multi-energy flow system scheduling scheme with energy efficiency as a target is obtained;
6) substituting the electric-thermal coupling multi-energy flow system scheduling scheme which is obtained in the step 5) and aims at the economy into an energy efficiency objective function of an equation (18), and recording the result as the resultSubstituting the electric-thermal coupling multi-energy flow system scheduling scheme which is obtained in the step 5) and aims at energy efficiency into an economic objective function of an equation (17), and recording the result as
7) Establishing an electric-thermal coupling multi-energy flow system optimization scheduling objective function which gives consideration to economy and energy efficiency; the expression is as follows:
8) establishing an electric-thermal coupling multi-energy flow system optimization scheduling model considering economy and energy efficiency by taking the formula (19) as an objective function and taking the formulas (1) to (16) as constraint conditions; and solving the model by adopting an interior point method to obtain the active power and the thermal power of each electro-thermal coupling unit in the electro-thermal coupling multi-energy flow system, and using the active power and the thermal power as an optimal scheduling scheme of the electro-thermal coupling multi-energy flow system.
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