CN106593771B - Electric heating decoupled system and its control method in a kind of co-generation unit - Google Patents
Electric heating decoupled system and its control method in a kind of co-generation unit Download PDFInfo
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Abstract
A kind of electric heating decoupled system in co-generation unit, including gas electricity generator, thermoelectricity unit, wind power generation plant, heat-storing device, electricity-heat converter, electric load and thermic load.Gas electricity generator is connect with electric load；Wind power generation plant and thermoelectricity unit are connect through electricity-heat converter with heat-storing device；Thermoelectric perpetual motion machine group is respectively connected to electric load, thermic load and heat-storing device；Heat-storing device is connect with thermic load.Method includes the demand of determining thermoelectricity load, buys wind-powered electricity generation unit price, cooler fuel price, sale of electricity valence and sell caloric value；Determine electricity and heat that unit of fuel generates and the heat that unit quantity of electricity is generated by electric heating conversion；Solve the power of thermoelectricity unit, heat-storing device, gas electricity generator, the interaction power of wind power generation plant and heat-storing device, thermoelectricity unit and heat-storing device；If thermoelectricity load fluctuates, adjusted by heat-storing device and gas electricity generator.The present invention has decoupled the electricity determining by heat method of operation, and solves the problems, such as wind electricity digestion.
Description
Technical field
The invention belongs to Cogeneration Heat electrolysis coupling control technique field, the electricity in a kind of co-generation unit is related generally to
Hot decoupled system and its control method.
Background technique
The northern area of China generator unit structure is more single, and based on fired power generating unit, wherein thermoelectricity unit occupies quite
Big ratio, and as main heat source.The old thermoelectricity unit in the Northeast is faced because of reasons such as peak modulation capacity deficiencies
Transformation, demand of the method for operation of thermoelectricity unit itself " electricity determining by heat " because paying the utmost attention to thermic load, so that negative to electricity
The electric energy that lotus demand provides can be too little or too much, and coupled thermomechanics relationship seriously constrains the peak modulation capacity of thermoelectricity unit, causes electricity
Net fluctuation.
Traditional thermoelectricity unit can be divided into back pressure type unit and condensing-type unit, and back pressure type unit is by all weary of steam turbine
Vapour is sent into heating steam pipe network and carries out heat supply, and without cold source energy, efficiency is higher, in the condition for preferentially meeting certain heating power
Lower generated output fixation can not be adjusted, and strictly be run by " electricity determining by heat " mode.The thermal power and generated output of condensing-type unit
Not stringent restricting relation, under the thermal power of a certain determination, generated output can be adjusted in a certain range, i.e.,
Just in this way, adjustable extent can not effectively improve thermoelectricity unit peak modulation capacity, the method for operation also belongs to " electricity determining by heat ".Currently
Status can't completely be efficiently modified thermoelectricity unit, cannot decouple the method for operation of " electricity determining by heat ".Although for heat
The method of motor group peak modulation capacity optimal control, has been made many feasibility studies, and also achieve one to a certain extent
A little progress and achievement, but there is no the methods of operation for fundamentally decoupling thermoelectricity unit " electricity determining by heat " for these researchs, only
Peak regulation is carried out in certain adjustable extent, improves peak load regulation ability, heating power and generated output with being unable to flexibility and reliability
There are still a kind of coupled relations, and after exceeding adjustable extent, thermoelectricity unit still cannot cope with well.
The coupled thermomechanics method of operation of Conventional thermoelectric unit is mainly from thermal load demands are preferentially met as starting point, heat
Motor group can also generate the electric energy of corresponding amount while generating a certain amount of thermal energy.For the electric energy that thermoelectricity unit generates, electricity
Net all will be received unconditionally, this makes electric energy supply and demand that imbalance may occur.Especially night in winter, electrical load requirement
Few, thermal load demands are more, and power grid receives excessive electric energy that can generate fluctuation to power grid, influence grid stability, also result in electricity
It can be unable to fully utilize, cause energy waste and the uneconomical operation of steam power plant.
Meanwhile China's Wind Power Generation Industry has quite a few all to concentrate on northern area, annual wind-electricity integration amount also increases year by year
Add, but bring consumption problem is also increasingly severe therewith for the extensive development of wind-powered electricity generation, if abandonment can be made full use of to be wasted
The energy, it will on future source of energy pattern variation bring very influence greatly.
Summary of the invention
To realize thermoelectricity decoupling operation and being optimal this target of operating status, the invention proposes a kind of cogenerations of heat and power
Electric heating decoupled system and its control method in system.
Technical scheme is as follows:
A kind of electric heating decoupled system in co-generation unit, including gas electricity generator, thermoelectricity unit, wind-power electricity generation dress
It sets, heat-storing device, electricity-heat converter, electric load and thermic load；Electric load, including lighting installation, household electrical appliance and industrial
Electric equipment；Thermic load, including industrial heat equipment and civil heating equipment；Gas electricity generator is straight with electric load through supply network
It connects and is connected；Wind power generation plant is connected through heat pipe with heat-storing device by electricity-heat converter；Thermoelectricity unit, through powering
Network connection is connected to thermic load through heat supply network, is connected to heat-storing device through heat pipe to electric load；Thermoelectricity unit, through supply network
It is connected with electricity-heat converter, electricity-heat converter is connected through heat pipe with heat-storing device；Heat-storing device, it is negative through heat supply network and heat
Lotus is connected directly.
A kind of control method of electric heating decoupled system in co-generation unit, comprising the following steps:
Step 1: determine the demand of thermic load, the demand of electric load, buy wind-powered electricity generation unit price, thermoelectricity unit fuel
The cooler fuel price of unit price and gas electricity generator sells caloric value and sale of electricity valence；
Step 2: determining the electricity that thermoelectricity unit unit of fuel generates and the electricity that heat, gas electricity generator unit combustion gas generate
The heat that amount and unit quantity of electricity are generated by electric heating conversion；
Step 3: according to the demand of thermic load and the demand of electric load, thermoelectricity unit being gone out by PSO Algorithm
Generated output and heating power, the heating power of heat-storing device, the generated output and wind power generation plant of gas electricity generator
With the interaction power and thermoelectricity unit of heat-storing device and the interaction power of heat-storing device, make co-generation unit to meet supply and demand flat
While weighing apparatus, thermoelectricity decoupling is realized；
Step 4: co-generation unit reaches balance after step 3, if thermic load and electric load fluctuate, is filled by heat accumulation
It sets and is adjusted with gas electricity generator, adjustment cost is no more than the range of steam power plant's setting.
Step 4.1: when adjustment cost is less than setting range, judging the variation of thermal load demands and electrical load requirement respectively
Trend；
If electrical load requirement increases, the generated output of gas electricity generator is improved；
If electrical load requirement is reduced, gas electricity generator operation is judged whether there is；If there is the case where gas electricity generator operation
Under, reduce the generated output of gas electricity generator；If it is extra to generate thermoelectricity unit in the case where without gas electricity generator operation
Electric energy is converted into thermal energy storage to heat-storing device through electric heating converter device；
If thermal load demands increase, the heating power of heat-storing device is improved；
If thermal load demands are reduced, heat-storing device operation is judged whether there is；If in the case where having heat-storing device operation, drop
The heating power of low heat-storing device；If the extra thermal energy for generating thermoelectricity unit is direct in the case where without heat-storing device operation
It stores into heat-storing device；
Step 4.2: if adjustment cost is more than setting range, return step 3.
Particle in particle swarm algorithm, the heating power provided including wind power generation plant through electricity-heat converter, combustion gas
Electrical power that the generated output of generator, the heating power of heat-storing device, thermoelectricity unit are provided to electric load, thermoelectricity unit are to warm
The electrical power and thermoelectricity unit that the thermal power of load offer, thermoelectricity unit carry out electric heat storage to heat-storing device are directly to heat-storing device
The thermal power of accumulation of heat.
Fitness value in particle swarm algorithm refers to using co-generation unit operating cost as the functional value of objective function.
Beneficial effects of the present invention are as follows:
Gas electricity generator can be all generally equipped with to improve the peak modulation capacity of thermoelectricity unit in steam power plant, but cannot be from root
Peak modulation capacity deficiency is solved the problems, such as in sheet.In view of the above-mentioned problems, the present invention by steam power plant configure heat-storing device and
Gas electricity generator improves the peak modulation capacity of thermoelectricity unit, can not only decouple " electricity determining by heat " method of operation, can also pass through electricity
Accumulation of heat dissolves wind-powered electricity generation, increases wind-powered electricity generation and surfs the Internet space, improves wind energy utilization.This method can effectively solve current northern area
The problem of steam power plant faces transformation because of peak modulation capacity deficiency, and asking for wind electricity digestion can be effectively solved to a certain extent
Topic.
Detailed description of the invention
Fig. 1 is the energy transmission signal of the electric heating decoupled system in the co-generation unit in the specific embodiment of the invention
Figure；
Fig. 2 is the base of the control method of the electric heating decoupled system in the co-generation unit in the specific embodiment of the invention
This flow chart；
Fig. 3 is the flow chart of the solution optimum particle position in the specific embodiment of the invention.
Specific embodiment
The invention proposes the electric heating decoupled system and its control method in a kind of co-generation unit, thermoelectricity decoupling operations
Mode, be exactly the generation of thermal energy and electric energy does not restrict mutually with the change of heat user and electric user demand, by utilizing heat accumulation
Device and gas electricity generator reach in the case where thermic load and electrical load requirement are unevenly distributed, and are still able to satisfy different heat and use
The requirement at family and electric user demand, and grid stability is not influenced, maintain equilibrium of supply and demand relationship.Although this method of operation does not have
Thermoelectricity relationship is decoupled from thermoelectricity unit itself, but thermoelectricity relationship, flexibility and reliability are decoupled from the angle of co-generation unit
Improve co-generation unit peak modulation capacity, the effective solution problem of current steam power plant's peak modulation capacity deficiency in ground.
A kind of electric heating decoupled system in co-generation unit, including gas electricity generator, thermoelectricity unit, wind-power electricity generation dress
It sets, heat-storing device, electricity-heat converter, electric load and thermic load；Electric load, including lighting installation, household electrical appliance and industrial
Electric equipment；Thermic load, including industrial heat equipment and civil heating equipment；Gas electricity generator is straight with electric load through supply network
It connects and is connected；Wind power generation plant is connected through heat pipe with heat-storing device by electricity-heat converter；Thermoelectricity unit, through powering
Network connection is connected to thermic load through heat supply network, is connected to heat-storing device through heat pipe to electric load；Thermoelectricity unit, through supply network
It is connected with electricity-heat converter, electricity-heat converter is connected through heat pipe with heat-storing device；Heat-storing device, it is negative through heat supply network and heat
Lotus is connected directly.The energy transmission schematic diagram of electric heating decoupled system in co-generation unit is as shown in Figure 1.
A kind of control method of electric heating decoupled system in co-generation unit, comprising the following steps:
Step 1: determine the demand of thermic load, the demand of electric load, buy wind-powered electricity generation unit price, thermoelectricity unit fuel
The cooler fuel price of unit price and gas electricity generator sells caloric value and sale of electricity valence；
Step 2: determining the electricity that thermoelectricity unit unit of fuel generates and the electricity that heat, gas electricity generator unit combustion gas generate
The heat that amount and unit quantity of electricity are generated by electric heating conversion；
Step 3: according to the demand of thermic load and the demand of electric load, thermoelectricity unit being gone out by PSO Algorithm
Generated output and heating power, the heating power of heat-storing device, the generated output and wind power generation plant of gas electricity generator
With the interaction power and thermoelectricity unit of heat-storing device and the interaction power of heat-storing device, make co-generation unit to meet supply and demand flat
While weighing apparatus, thermoelectricity decoupling is realized；
Step 4: co-generation unit reaches balance after step 3, if thermic load and electric load fluctuate, is filled by heat accumulation
It sets and is adjusted with gas electricity generator, adjustment cost is no more than the range of steam power plant's setting.
Step 4.1: when adjustment cost is less than setting range, judging the variation of thermal load demands and electrical load requirement respectively
Trend；
If electrical load requirement increases, the generated output of gas electricity generator is improved；
If electrical load requirement is reduced, gas electricity generator operation is judged whether there is；If there is the case where gas electricity generator operation
Under, reduce the generated output of gas electricity generator；If it is extra to generate thermoelectricity unit in the case where without gas electricity generator operation
Electric energy is converted into thermal energy storage to heat-storing device through electric heating converter device；
If thermal load demands increase, the heating power of heat-storing device is improved；
If thermal load demands are reduced, heat-storing device operation is judged whether there is；If in the case where having heat-storing device operation, drop
The heating power of low heat-storing device；If the extra thermal energy for generating thermoelectricity unit is direct in the case where without heat-storing device operation
It stores into heat-storing device；
Step 4.2: if adjustment cost is more than setting range, return step 3.
The basic flow chart of the control method of thermoelectricity decoupled system in co-generation unit is as shown in Figure 2.
Particle in particle swarm algorithm, the heating power provided including wind power generation plant through electricity-heat converter, combustion gas
Electrical power that the generated output of generator, the heating power of heat-storing device, thermoelectricity unit are provided to electric load, thermoelectricity unit are to warm
The electrical power and thermoelectricity unit that the thermal power of load offer, thermoelectricity unit carry out electric heat storage to heat-storing device are directly to heat-storing device
The thermal power of accumulation of heat.
Fitness value in particle swarm algorithm refers to using co-generation unit operating cost as the functional value of objective function.
From the point of view of the current situation of current large capacity heat-storage technology, large-capacity phase change heat-storing device is undoubtedly cogeneration of heat and power
The optimal selection of system, for other heat accumulation modes, large-capacity phase change heat-storing device energy storage density is higher, in release heat
Temperature approximately constant when can and store thermal energy, can store relatively large number of thermal energy with the volume of very little.In the present invention, needle
It the problem of to steam power plant's transformation, can choose using the large-capacity phase change heat-storing device for carrying out heat accumulation using phase-change material.
Although heat-storing device can decouple the method for operation of coupled thermomechanics, gas electricity generator, thermoelectric perpetual motion machine how are distributed
It is also particularly important for organizing with the power output size of heat-storing device, reasonably regulates and controls gas electricity generator, thermoelectricity unit and heat-storing device
Power output size, so that the co-generation unit is in the minimum operating status of cost, so the not only decoupling fortune of " electricity determining by heat "
Line mode can also make the benefit of steam power plant reach maximization.
The power output size of gas electricity generator, thermoelectricity unit and heat-storing device, be according to the day thermoelectricity workload demand song in area
Line chart does, so that it is determined that the power output size of gas electricity generator, the power output size of thermoelectricity unit and the power output of heat-storing device
The electric energy that size and heat-storing device are issued by the wind power generation plant that electric heating converter device obtains number, heat-storing device
The electric energy that the thermoelectricity unit of acquisition issues number and heat-storing device directly acquire the sending of thermoelectricity unit thermal energy number.Heat
When load boom period, thermoelectricity unit heat power output increases, and due to unit itself coupled thermomechanics relationship, electrical power also be will increase, and be more than
The required power of electric load, extra electrical power are delivered in heat-storing device by electricity-heat converter, and insufficient thermal power is then
It is supplemented by heat-storing device.The process entirely regulated and controled is needed according to electricity price and caloric value and gas electricity generator, thermoelectricity unit and storage
The operating cost of thermal adjusts, it is possible to which jet dynamic control can go out a part of electrical power, it is also possible to heat-storing device
The electrical power for obtaining wind-powered electricity generation accumulation of heat is some more, this just needs to establish to lead to using co-generation unit operating cost as objective function
Cross the optimal solution of the heating power that particle swarm algorithm show that wind power generation plant is provided through electricity-heat converter, gas electricity generator
The electrical power that the optimal solution of generated output, the optimal solution of the heating power of heat-storing device, thermoelectricity unit are provided to electric load is most
The optimal solution for the thermal power that excellent solution, thermoelectricity unit are provided to thermic load, thermoelectricity unit carry out the electric work of electric heat storage to heat-storing device
The optimal solution and thermoelectricity unit of rate directly carry out optimal control method to the optimal solution of the thermal power of heat-storing device accumulation of heat, so that
Electric heating decoupled system in co-generation unit is optimal operating status, and makes steam power plant's maximizing the benefits.
For the method for operation of co-generation unit " electric heating decoupling ", using co-generation unit decoupling operating cost as target
Function utilizes PSO Algorithm optimal solution under the premise of meeting constraint condition.The present invention is using particle swarm algorithm as asking
Solution tool.Optimizing is minimized with co-generation unit operating cost, when solving cost minimization, by calculating ambient particles position
Determining optimum particle position is set, to obtain optimal solution, it is as follows to solve process step:
Step 1: according to the cost in objective function, i.e. operating cost of the thermoelectricity unit in unit time t, combustion gas hair
Motor issued in unit time t the cost of electrical power, in unit time t heat cost from heat-storing device to thermic load heat supply,
Particle dimension in group is arrangedParticle in group, the confession provided including wind power generation plant through electricity-heat converter
Thermal power ηcPf, gas electricity generator generated output Pr, heat-storing device heating power HP, thermoelectricity unit provides to electric load
Electrical power Pbq, the thermal power h that is provided to thermic load of thermoelectricity unitbq, thermoelectricity unit to heat-storing device carry out electric heat storage electrical power
Pr.dWith thermoelectricity unit directly to the thermal power h of heat-storing device accumulation of heatr.d, and limit computational accuracy εpsoAnd maximum number of iterations
Kmax。
When establishing objective function, due to the control method decoupled the present invention is directed to illustrate thermoelectricity, therefore at the beginning of not considering equipment
The costs such as phase cost of investment, plant maintenance and management cost and other costs of labor, co-generation unit operating cost CS?
Cost expressions used are shown below in unit time t:
CS=Σ Cb+ΣCq+Cr+Cc.r-Csell.d-Csell.h
Wherein, CbFor operating cost of the separate unit back pressure type unit in unit time t, CqIt is separate unit condensing-type unit in list
Operating cost in the time t of position, CrThe cost of electrical power, C are issued in unit time t for gas electricity generatorc.rFor the unit time
In t heat cost from heat-storing device to thermic load heat supply, in unit time t heat cost from heat-storing device to thermic load heat supply,
Heat-storing device is primarily referred to as to obtain wind power generation plant sending electric energy and pass through the cost that electricity-heat converter carrys out accumulation of heat, and thermoelectricity
Unit carries out the cost of heat accumulation after carrying out electric heating conversion and thermoelectricity unit directly carries out the cost of heat accumulation in thermoelectric perpetual motion machine group cost
In take into account, do not consider further that herein, Csell.d、Csell.hThe income of electric energy and thermal energy is sold in respectively unit time t.Target
Function does not consider the cost of heat-storing device loss thermal energy, and the cost source for losing thermal energy is complex, it may be possible to buy wind-force
Power generator issues electric energy and carrys out the cost of accumulation of heat by electricity-heat converter, it is also possible to which thermoelectricity unit passes through to heat-storing device
Electricity-heat converter carrys out the cost of accumulation of heat or direct accumulation of heat, and depending on needing according to the actual situation, therefore the present invention does not consider this part
Cost problem.
Operating cost C of the separate unit back pressure type unit in unit time tbIt can be by fuel cost Cfuel.bWith separate unit back pressure type
Unit Commitment cost Cqt.bIt constitutes, expression formula are as follows:
Cb=Cfuel.b+Cqt.b
Unit time t fuel cost can be expressed as the quadric form of the sending power of thermoelectricity unit, expression formula are as follows:
Cfuel.b=[am(Pb)2+bmPb+cm]Cfuel.d
In above formula, am、bm、cmFor the coal-fired coefficient of back pressure type unit m, PbFor hair of the back pressure type unit in unit time t
Electrical power, Cfuel.dFor the cost of unit Coal-fired capacity, separate unit back pressure type Unit Commitment cost Cqt.bIt can be considered fixed value.
Linear coupling relationship, expression formula is presented in the generated output and heating power of back pressure type unit are as follows:
hb=k1Pb+k2
In above formula, k1、k2For the coefficient of coup, hbFor the heating power of back pressure type unit in unit time t, PbFor back pressure type
Generated output of the unit in unit time t.
Back pressure type unit carries out heat supply as heat source using the steam exhaust that steam turbine is discharged, solidifying by taking single condensing-type unit as an example
Bleeding point is housed on the steam turbine cylinder of vapour formula unit, can therefrom extract the hot steam under certain pressure out, then condensing-type unit
Operating cost expression formula are as follows:
Cq=Cfuel.q+Cqt.q
In formula, Cfuel.qFor the fuel cost of single condensing-type unit, Cqt.qFor single condensing-type Unit Commitment cost.
The live steam amount D of single condensing-type unit can be by the generated output P of single condensing-type unitqWith the steam extraction of single condensing-type unit
Measure D1It indicates are as follows:
D=d1D1+d2Pq
In formula, d1、d2For fitting coefficient.
Cfuel.q=[q1D2+q2PD+q3P2+q4D+q5P+q6]Cfuel.d
In formula, q1、q2、q3、q4、q5、q6For coal-fired coefficient.
Although condensing-type unit can adjust electrical power in a certain range, to a certain extent, coupled thermomechanics relationship is still
In the presence of electrical power and thermal power relationship are complex, and the present invention is by the thermoelectricity of condensing-type unit thermoelectricity relationship and back pressure type unit
Relationship is considered as identical, expression formula are as follows:
hq=k1Pq+k2
In formula, hqFor the heating power of condensing-type unit in unit time t, k1、k2For the coefficient of coup, PqFor condensing-type machine
The generated output of group.
When solving to objective function, heating power and generated output will not be caused to close in the difference of consideration machine set type
The difference of system.
Gas electricity generator issues the cost of electrical power in unit time t:
Cr=Cfuel.r+Cqt.r
In above formula, Cfuel.rFor the fuel cost of gas electricity generator in unit time t；Cqt.rFor gas electricity generator start and stop at
This；CngFor the unit price of natural gas；VrThe amount of natural gas consumed for gas electricity generator in unit time t；PrFor unit time t
The electrical power of interior gas electricity generator output；ηrFor the generating efficiency of gas electricity generator；L is natural gas Lower heat value.
Heat cost of the heat-storing device to thermic load heat supply in unit time t:
Cc.r=ηcPfCf.d
In above formula, ηcFor the efficiency of the heat to electricity conversion of heat-storing device；PfIt is heat-storing device in unit time t from wind-power electricity generation
The electrical power that device obtains；Cf.dFor the monovalent cost for obtaining wind-powered electricity generation after wind-electricity integration from power grid.
It, can be by operating cost of the separate unit back pressure type unit in unit time t in actually calculating from the point of view of total system
CbWith separate unit condensing-type unit unit time t operating cost CqIt is considered as identical, i.e. Cb=Cq, and in the present embodiment, with
Operating cost C of the separate unit back pressure type unit in unit time tbFor, and enable Cb=C, wherein C is thermoelectricity unit in unit
Operating cost in time t, then objective function can be rewritten as:
Cs=Σ C+Cr+Cc.r-Csell.d-Csell.h
Step 2: according to the thermal load demands amount in each period in unit time t and electrical load requirement amount and electricity price and
Caloric value initializes the position of each particle, sets the range of the movement speed v and position x of each particle.
Step 3: calculating the initial fitness value of particle of co-generation unit operating cost in the required period, remember simultaneously
Record each particle individual extreme value and population extreme value in each period in the period.
Step 4: each particle fitness value is compared with its individual extreme value, it is such as more excellent, then update current individual
Extreme value Cbest.i, while each particle fitness value being compared with population optimal value, such as more excellent, then Population Regeneration optimal value
Cbest。
Step 5: being updated according to the position and speed formula of particle to particle.If particle position phase after update
The parameter answered is unsatisfactory for co-generation unit power supply Constraints of Equilibrium, heat supply Constraints of Equilibrium, thermoelectricity unit units limits, heat accumulation constraint
With heat-storing device constraint etc. constraint conditions, then particle is regenerated, until meeting constraint condition.If update times are more than setting
Number is then replaced with former feasible particle.Speed is as follows with location update formula:
In formula, d=1,2,3,4；ω is inertia weight；c1, c2For Studying factors；r1, r2For be uniformly distributed in (0,1) with
Machine number；vi, xiFor the speed and position, the speed of subscript k+1 i-th of particle of expression and the kth time update of position of i-th of particle.
The electrical power that power supply Constraints of Equilibrium refers to that thermoelectricity unit issues is equal to the sum of the electrical power that gas electricity generator issues
Electrical power needed for electric load, i.e.,
ΣPbq+Pr=PQ
In formula, Pbq、Pr、PQSeparate unit thermoelectricity unit is provided to electric load in respectively unit time t electrical power, combustion gas hair
Electrical power needed for electrical power and electric load that motor group issues.
Heat supply Constraints of Equilibrium refers to that the sum of the heating power of thermoelectricity unit and the heating power of heat-storing device are equal to thermic load
Required thermal power, i.e.,
Σhbq+HP=HQ
In formula, hbq、HPAnd HQRespectively indicate the heating power of separate unit thermoelectricity unit, heat-storing device heat supply in unit time t
Thermal power needed for power and thermic load.
Thermoelectricity unit units limits, including thermoelectricity unit electrical power units limits, thermoelectricity unit thermal power units limits and
The electrical power units limits that gas electricity generator issues.
Because back pressure type unit and condensing-type unit can carry out power constraint with the inequality of same form, then thermoelectricity unit
Electrical power units limits, it may be assumed that
Pmin.l≤Pl≤Pmax.l
Pl=Pbq+Pr.d
In formula, Pmax.lAnd Pmin.lIt is the bound constraint for the electrical power that thermoelectricity unit issues, PbqIt is negative to electricity for thermoelectricity unit
The electrical power that lotus provides, Pr.dFor the electrical power that thermoelectricity unit is provided to heat-storing device, PlThe electrical power issued for thermoelectricity unit.
Thermoelectricity unit thermal power units limits are as follows:
0≤h≤hmax
H=hbq+hr.d
In formula, hmaxIndicate thermoelectricity unit thermal power power output maximum value, hbqThe hot merit provided for thermoelectricity unit to thermic load
Rate, hr.dFor the thermal power that thermoelectricity unit is directly provided to heat-storing device, h is thermoelectricity unit thermal power power output.
The electrical power units limits that gas electricity generator issues are as follows:
Pmin.r≤Pr≤Pmax.r
In formula, Pmin.r、Pmax.rFor the bound constraint for the electrical power that gas electricity generator issues, PrFor gas electricity generator sending
Electrical power.
Heat accumulation constraint, including heat-storing device interact that electrical power constrains, heat-storing device is from thermoelectricity unit with wind power generation plant
The electrical power constraint of heat-storing device is supplied to after obtaining electric energy progress electric heating conversion and heat-storing device directly acquires thermoelectricity unit heat
Power constraint.
Heat-storing device interacts electrical power constraint with wind power generation plant, it may be assumed that
In formula,The bound of electrical power, P are interacted with wind power generation plant for heat-storing devicefFor heat-storing device
Electrical power is interacted with wind power generation plant.
Heat-storing device obtains after electric energy carries out electric heating conversion from thermoelectricity unit and is supplied to the constraint of heat-storing device electrical power, it may be assumed that
In formula,It is obtained after electric energy carries out electric heating conversion for heat-storing device from thermoelectricity unit and is supplied to heat accumulation dress
The electrical power bound set, Pr.dIt is obtained after electric energy carries out electric heating conversion for heat-storing device from thermoelectricity unit and is supplied to heat-storing device
Electrical power.
Heat-storing device directly acquires the constraint of thermoelectricity unit thermal power, it may be assumed that
In formula,The thermal power bound of thermoelectricity unit, h are obtained for heat-storing devicer.dIt is directly obtained for heat-storing device
Take thermoelectricity unit thermal power.
Heat-storing device constraint, it may be assumed that
Hmin.P≤HP≤Hmax.P
Hmin.r≤Hr≤Hmax.r
In formula, Hmax.P、Hmin.PIt is heat-storing device to the thermal power bound of thermic load heat supply, HPIt is negative to heat for heat-storing device
The thermal power of lotus heat supply, Hmax.r、Hmin.rFor the bound of heat-storing device heat storage capacity, HrFor the heat storage capacity of heat-storing device.
Step 6: for seek each particle optimal value, i.e. the heat supply that is provided through electricity-heat converter of wind power generation plant
Power ηcPfOptimal value, gas electricity generator generated output PrOptimal value, heat-storing device heating power HPOptimal value,
The electrical power P that thermoelectricity unit is provided to electric loadbqOptimal value, the thermal power h that is provided to thermic load of thermoelectricity unitbqIt is optimal
Value, thermoelectricity unit carry out the electrical power P of electric heat storage to heat-storing devicer.dOptimal value and thermoelectricity unit directly to heat-storing device store
The thermal power h of heatr.dOptimal value, particle position and speed are updated by repeatedly recycling third step to the 5th step, obtains particle
Optimal solution, i.e. the heating power η that is provided through electricity-heat converter of wind power generation plantcPfOptimal solution, gas electricity generator hair
Electrical power PrOptimal solution, heat-storing device heating power HPOptimal solution, the electrical power P that is provided to electric load of thermoelectricity unitbq
Optimal solution, the thermal power h that is provided to thermic load of thermoelectricity unitbqOptimal solution, thermoelectricity unit to heat-storing device carry out electric heat storage
Electrical power Pr.dOptimal solution and thermoelectricity unit directly to the thermal power h of heat-storing device accumulation of heatr.dOptimal solution.
Step 7: judging whether algorithm terminates: if current iteration number is equal to setting maximum number of iterations KmaxOr error essence
Degree is less than or equal to εpso, then confession that iteration ends, and export calculated result, i.e. wind power generation plant are provided through electricity-heat converter
Thermal power ηcPf, gas electricity generator generated output Pr, heat-storing device heating power HP, thermoelectricity unit provides to electric load
Electrical power Pbq, the thermal power h that is provided to thermic load of thermoelectricity unitbq, thermoelectricity unit to heat-storing device carry out electric heat storage electrical power
Pr.dWith thermoelectricity unit directly to the thermal power h of heat-storing device accumulation of heatr.d, and limit computational accuracy εpsoAnd maximum number of iterations
Kmax.If the number of iterations reaches maximum and error precision is unsatisfactory for requiring, returns to second step and restart.
The flow chart for solving optimum particle position is as shown in Figure 3.
Claims (3)
- Electric heating decoupling 1. a kind of control method of the electric heating decoupled system in co-generation unit, in the co-generation unit System, including gas electricity generator, thermoelectricity unit, wind power generation plant, heat-storing device, electricity-heat converter, electric load and heat are negative Lotus；The electric load, including lighting installation, household electrical appliance and industrial electricity apparatus；The thermic load, including industrial heat equipment and civil heating equipment；The gas electricity generator, is connected directly through supply network and electric load；The wind power generation plant is connected through heat pipe with heat-storing device by electricity-heat converter；The thermoelectricity unit, is connected to electric load through supply network, is connected to thermic load through heat supply network, is connected to heat accumulation through heat pipe Device；The thermoelectricity unit is connected through supply network with electricity-heat converter, and electricity-heat converter is filled through heat pipe and heat accumulation It sets and is connected；The heat-storing device, is connected directly through heat supply network and thermic load；It is characterized in that, method includes the following steps:Step 1: determine the demand of thermic load, the demand of electric load, buy wind-powered electricity generation unit price, thermoelectricity unit cooler fuel price With the cooler fuel price of gas electricity generator, sell caloric value and sale of electricity valence；Step 2: determine thermoelectricity unit unit of fuel generate electricity and heat, gas electricity generator unit combustion gas generate electricity and The heat that unit quantity of electricity is generated by electric heating conversion；Step 3: according to the demand of thermic load and the demand of electric load, the hair of thermoelectricity unit is gone out by PSO Algorithm Electrical power and heating power, the heating power of heat-storing device, the generated output and wind power generation plant of gas electricity generator and storage The interaction power and thermoelectricity unit of thermal and the interaction power of heat-storing device, make co-generation unit meet the equilibrium of supply and demand Meanwhile realizing thermoelectricity decoupling；Step 4: co-generation unit reaches balance after step 3, if thermic load and electric load fluctuate, by heat-storing device and Gas electricity generator is adjusted, and adjustment cost is no more than the range of steam power plant's setting；The fitness value in particle swarm algorithm in the step 3 refers to using co-generation unit operating cost as target letter Several functional values；When establishing objective function, co-generation unit operating cost CSThe cost expressions such as following formula institute used in unit time t Show:CS=∑ Cb+∑Cq+Cr+Cc.r-Csell.d-Csell.hWherein, CbFor operating cost of the separate unit back pressure type unit in unit time t, CqIt is separate unit condensing-type unit in unit Between operating cost in t, CrThe cost of electrical power, C are issued in unit time t for gas electricity generatorc.rFor in unit time t Heat cost from heat-storing device to thermic load heat supply, in unit time t heat cost from heat-storing device to thermic load heat supply, Csell.d、Csell.hThe income of electric energy and thermal energy is sold in respectively unit time t；Operating cost C of the separate unit back pressure type unit in unit time tbBy fuel cost Cfuel.bWith separate unit back pressure type Unit Commitment Cost Cqt.bIt constitutes, expression formula are as follows:Cb=Cfuel.b+Cqt.bUnit time t fuel cost is expressed as the quadric form of the sending power of thermoelectric perpetual motion machine group, expression formula are as follows:Cfuel.b=[am(Pb)2+bmPb+cm]Cfuel.dIn above formula, am、bm、cmFor the coal-fired coefficient of back pressure type unit m, PbThe power generation function for being back pressure type unit in unit time t Rate, Cfuel.dFor the cost of unit Coal-fired capacity；Linear coupling relationship, expression formula is presented in the generated output and heating power of back pressure type unit are as follows:hb=k1Pb+k2In above formula, k1、k2For the coefficient of coup, hbFor the heating power of back pressure type unit in unit time t, PbExist for back pressure type unit Generated output in unit time t；Condensing-type unit operating cost expression formula are as follows:Cq=Cfuel.q+Cqt.qIn formula, Cfuel.qFor the fuel cost of single condensing-type unit, Cqt.qFor single condensing-type Unit Commitment cost；The live steam amount of single condensing-type unitDIt can be by the generated output P of single condensing-type unitqWith the steam extraction amount D of single condensing-type unit1 It indicates are as follows:D=d1D1+d2PqIn formula, d1、d2For fitting coefficient；Cfuel.q=[q1D2+q2PD+q3P2+q4D+q5P+q6]Cfuel.dIn formula, q1、q2、q3、q4、q5、q6For coal-fired coefficient；The thermoelectricity relationship of condensing-type unit thermoelectricity relationship and back pressure type unit is considered as identical, expression formula are as follows:hq=k1Pq+k2In formula, hqFor the unit timetThe heating power of interior condensing-type unit, k1、k2For the coefficient of coup, PqFor the hair of condensing-type unit Electrical power；Gas electricity generator issues the cost of electrical power in unit time t:Cr=Cfuel.r+Cqt.rIn above formula, Cfuel.rFor the unit timetThe fuel cost of interior gas electricity generator；Cqt.rFor gas electricity generator start-up and shut-down costs；Cng For the unit price of natural gas；VrThe amount of natural gas consumed for gas electricity generator in unit time t；PrFor combustion gas in unit time t The electrical power of generator output；ηrFor the generating efficiency of gas electricity generator；LFor natural gas Lower heat value；Heat cost of the heat-storing device to thermic load heat supply in unit time t:Cc.r=ηcPfCf.dIn above formula, ηcFor the efficiency of the heat to electricity conversion of heat-storing device；PfFor the unit timetInterior heat-storing device is from wind power generation plant The electrical power of acquisition；Cf.dFor the monovalent cost for obtaining wind-powered electricity generation after wind-electricity integration from power grid.
- 2. the control method of the electric heating decoupled system in a kind of co-generation unit according to claim 1, feature exist In, the particle in particle swarm algorithm in the step 3, the heat supply provided including wind power generation plant through electricity-heat converter Electrical power, the heat that power, the generated output of gas electricity generator, the heating power of heat-storing device, thermoelectricity unit are provided to electric load Thermal power that motor group is provided to thermic load, thermoelectricity unit to heat-storing device carry out electric heat storage electrical power and thermoelectricity unit it is direct To the thermal power of heat-storing device accumulation of heat.
- 3. the control method of the electric heating decoupled system in a kind of co-generation unit according to claim 1, feature exist In the step 4, comprising the following steps:Step 4.1: when adjustment cost is less than setting range, judging that the variation of thermal load demands and electrical load requirement becomes respectively Gesture；If electrical load requirement increases, the generated output of gas electricity generator is improved；If electrical load requirement is reduced, gas electricity generator operation is judged whether there is；If in the case where having gas electricity generator operation, drop The generated output of low gas electricity generator；If in the case where gas electricity generator operation, extra electric energy that thermoelectricity unit is generated Thermal energy storage is converted into heat-storing device through electric heating converter device；If thermal load demands increase, the heating power of heat-storing device is improved；If thermal load demands are reduced, heat-storing device operation is judged whether there is；If reducing storage in the case where having heat-storing device operation The heating power of thermal；If the extra thermal energy for generating thermoelectricity unit directly stores in the case where without heat-storing device operation Into heat-storing device；Step 4.2: if adjustment cost is more than setting range, return step 3.
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