A kind of demand response policy development method considering the limitation of fired power generating unit climbing rateTechnical field
The invention belongs to new energy to dissolve field, and in particular to consider thermal motor in a kind of high photovoltaic permeability electric systemThe demand response policy development method of group climbing rate limitation.
Background technique
It is universal with photovoltaic power generation, fluctuation is strong, by it is very big with the inside even from weather such as rain or shine round the clock the problems such asGradually it highlights.California, USA solar energy resources are abundant, and photovoltaic power generation discovers for the first time electricity record repeatly, are but faced with thermoelectricity after photovoltaic is reducedUnit is due to being limited the problem of being unable to satisfy power-balance by climbing rate.In high permeability photovoltaic net, period at noon photovoltaicGenerated energy is very high, it is sufficient to and meet most workload demand, reduces fired power generating unit generated output, and dusk photovoltaic power generation is gradually stoppedOnly, power output can only be increased substantially by fired power generating unit in order to meet workload demand.
Fired power generating unit climbing rate is used to measure the ability of unit ascending, descending load, is the weight that fired power generating unit operates normallyWant parameter.Meanwhile climbing rate is the function of unit capacity, size is limited in a certain range.If load curve raised benchThe slope of section is limited higher than fired power generating unit climbing rate, then fired power generating unit can not provide enough power outputs to maintain grid balance, is madeThe problems such as power quality of power grid and safe operation are on the hazard, and frequency unstability, cutting load are possibly even caused when serious.IfThe climbing rate that fired power generating unit is promoted by way of a large amount of spinning reserves are arranged can then waste a large amount of fuel energies and operating cost,Substantially reduce the feature of environmental protection and economy of system.Therefore the growth rate of load curve must be limited.
Most researchs solve the possible power train of high permeability photovoltaic with by way of planning running at presentIt unites extensive power imbalances problem, but its Construction and operation expense and electric energy loss are higher, and demand response is reasonable distributionLoad side resource, the effective means for promoting grid stability.Rationally electricity is advantageously implemented using the demand response resource of resident sideForce system peak load shifting and the two-win for reducing demand charge.User power utilization demand is reduced or shifted by way of demand response,It can reduce the rate of rise of load curve.So this patent proposes to consider thermoelectricity in a kind of high photovoltaic permeability electric systemThe demand response policy development method of unit climbing rate limitation.
Summary of the invention
The present invention aiming at the shortcomings in the prior art, provides a kind of demand response plan of consideration fired power generating unit climbing rate limitationSlightly formulating method, solves the extensive power imbalances that may cause in high photovoltaic permeability electric system due to photovoltaic power generation rapid drawdownProblem.
To achieve the above object, the invention adopts the following technical scheme:
A kind of demand response policy development method considering the limitation of fired power generating unit climbing rate, is used for high photovoltaic permeability electric powerIn system, it is characterised in that: according to the equivalent slope of actual electric network carry calculation load curve, consider fired power generating unit climbing rate limitSystem formulates corresponding demand response strategy for the equivalent slope of different load curve, ensures active power balance in electric system；InstituteThe formulation for stating demand response strategy, includes the following steps:
Step 1: the equivalent slope S of calculated load curveload；
Step 2: calculating fired power generating unit climbing rate and limit Sramp；
Step 3: by SloadWith SrampIt compares and formulates corresponding demand response policy, wherein work as SloadHigher than SrampWhen, select dynamic factor adjusting method；If dynamic factor S adjustedloadIt is still higher than SrampThen adjusted in advance.
To optimize above-mentioned technical proposal, the concrete measure taken further include:
Further, the step 1 is specific as follows:
As starting point S at the time of beginning using demand response, using load curve highest point as end point E, t is calculateds~teBetweenThe integral of load curve simultaneously replaces it with an area triangle equal thereto, then hypotenuse slope is equivalent replaces loadThe rate of rise of curve, equivalent slope calculation method are as follows:
Wherein, SloadFor the equivalent slope of load curve, Pafter(t) letter changed over time for demand response afterload curveNumber, tsFor demand response time started, teFor demand response end time, PsFor demand response time started corresponding load functionRate.
Further, the step 2 is specific as follows:
Fired power generating unit climbing rate is limited to fired power generating unit capacity multiplied by certain percentage in electric system, and calculation method is such asUnder:
Sramp=λ Stotal
Wherein, SrampFor the limitation of fired power generating unit climbing rate, λ is fired power generating unit climbing rate, StotalFor less than hair and stand-by heatIn fired power generating unit capacity summation.
Further, in the step 3, work as Sload≤Sramp, the demand response strategy of script enables to load in power gridThe equivalent slope of curve is limited no more than fired power generating unit climbing rate, is able to maintain that grid power balances, demand response strategy is without changingBecome.
Further, in the step 3, work as Sload> Sramp, the equivalent slope of load curve is greater than fired power generating unit climbing rate limitSystem, the demand response underpower that current demand response policy provides is to maintain grid power to balance；
In ts~tdPeriod first limits calculating demand response power according to climbing rate and distribution requirements resource response, ts isDemand response time started, tdIt is no longer able to that load curve is made to be maintained at generator climbing rate limitation or less for demand response powerTime, demand response power calculation algorithms needed for each moment power grid are as follows:
PDR(t)=Pbefore(t)-Pbefore(ts)-(t-ts)Sramp
Wherein, PDRIt (t) is demand response power needed for t moment power grid, PbeforeIt (t) is demand response preload curve,SrampFor the limitation of fired power generating unit climbing rate；
tdLater, change demand response strategy, carry out dynamic factor adjustment, relax the comfort level section of smart machine or mentionThe number that smart machine participates in demand response is risen, to obtain more demand response power；
After dynamic factor adjustment, with tdThe demand response time started t calculated for a new rounds', dynamic factor is calculated againThe equivalent slope S of load curve adjusted 'load, and and SrampCompare, if S 'load≤Sramp, then dynamic factor adjusts and terminates.
Further, in the step 3, as S 'load> Sramp, demand response power mistake needed for maintaining grid power to balanceHeight, dynamic factor adjustment are unable to satisfy requirement, are adjusted in advance, when a part of load is advanced to photovoltaic generation power abundanceIt uses, Forward load calculation method is as follows in advanced adjusting method:
Wherein, WpreFor the load of power grid Forward, S 'loadFor the equivalent slope of dynamic factor load curve adjusted,SrampFor the limitation of fired power generating unit climbing rate, tsFor demand response time started, teFor the demand response end time.
The beneficial effects of the present invention are:
1. reducing load curve with demand response method, solves bloom while guaranteeing users'comfort as far as possibleLie prostrate the extensive power imbalances problem that may cause in permeability electric system due to photovoltaic rapid drawdown；
2. considering the situation of the equivalent slope of a variety of load curves and the limitation of fired power generating unit climbing rate, have for each caseCorresponding demand response policy can flexibly cope with various power generations in practical power systems, electricity consumption situation, guarantee electric systemActive power balance, safeguard the security and stability of electric system.
Detailed description of the invention
Fig. 1 is that the equivalent slope of load curve calculates schematic diagram.
Fig. 2 is that dynamic factor adjusting method calculates schematic diagram.
Fig. 3 is that advanced adjusting method calculates schematic diagram.
Fig. 4 is is mentioned demand response strategy execution flow chart.
Fig. 5 is to execute dynamic factor adjustment and advanced adjustment afterload curve graph.
Specific embodiment
In conjunction with the accompanying drawings, the present invention is further explained in detail.
The demand response strategy of fired power generating unit climbing rate limitation is considered in high photovoltaic permeability electric system, particular content is such asUnder:
1. calculating the equivalent slope of load curve in electric system.The equivalent slope of load curve calculates thinking are as follows: is rung with demandIt is starting point S at the time of should starting, using load curve highest point as end point E, calculates ts~teBetween load curve integral simultaneouslyIt is replaced with an area triangle equal thereto, then hypotenuse slope can be equivalent oblique instead of the rising of load curveRate.Its physical significance is to replace continually changing slope with constant-slope in the case where issuing additional same charge.Equivalent slope showsIntention is shown in attached drawing 1.The equivalent slope calculation method of load curve is as follows:
Wherein, SloadFor the equivalent slope of load curve, Pafter(t) letter changed over time for demand response afterload curveNumber, tsFor demand response time started, teFor demand response end time, PsFor demand response time started corresponding load functionRate.
2. calculating fired power generating unit climbing rate limitation in electric system.Thinking are as follows: fired power generating unit capacity is multiplied by certain percentage.Calculation method is as follows:
Sramp=λ Stotal
Wherein, SrampFor the limitation of fired power generating unit climbing rate, λ is fired power generating unit climbing rate, take 0.5% in common engineering~1.5%, StotalFor the fired power generating unit capacity summation in less than hair and stand-by heat.
3. by SloadWith SrampIt compares and formulates corresponding demand response policy, be specifically divided into following three kinds of situations:
1)Sload≤Sramp
The demand response strategy of script enables to the equivalent slope of load curve to climb no more than fired power generating unit in power grid at this timeRatio of slope limitation is able to maintain that grid power balances.Demand response strategy is without changing at this time.
2)Sload> Sramp
At this point, the equivalent slope of load curve is limited greater than fired power generating unit climbing rate, illustrate that current demand response policy providesDemand response underpower to maintain grid power to balance.
It is first to increase to subtract afterwards since the demand response power that each moment needs changes over time trend, demand response just startsWhen the demand response power that needs it is less, load curve can still limited lower than generator climbing rate, at this time should be first according to climbingRate limitation calculates demand response power and distribution requirements resource response, sees the t in attached drawing 2s~tdPeriod.tdDemand is rung laterIt answers power to be no longer able to that load curve is made to be maintained at the limitation of generator climbing rate hereinafter, changing demand response strategy at this time, relaxesThe comfort level section of smart machine promotes the number that smart machine participates in demand response, to obtain more demand response functionRate, this is dynamic factor adjusting method.Demand response power calculation algorithms needed for each moment power grid are as follows:
PDR(t)=Pbefore(t)-Pbefore(ts)-(t-ts)Sramp
Wherein, PDRIt (t) is demand response power needed for each moment power grid, Pbefore(t) bent for demand response preloadLine, tsFor demand response time started, SrampFor the limitation of fired power generating unit climbing rate.
After dynamic factor adjustment, with tdThe t calculated for a new rounds', and it is bent to calculate dynamic factor load adjusted againThe equivalent slope S of line 'load, and and SrampCompare.If S 'load≤Sramp, then dynamic factor adjusts and terminates.
3)S′load> Sramp
Demand response power needed for maintaining grid power to balance in the case of this is excessively high, and dynamic factor adjusting method will be unable to meetIt is required that.However the action frequency that smart machine participates in demand response is limited, comfort level should not also relax without limitation, dynamic factorThe demand response power limited that adjusting method can increase.When therefore needing a part of load being advanced to photovoltaic generation power abundanceIt uses, the method is known as advanced adjusting method, and schematic diagram is shown in attached drawing 3.Forward load calculation method is as follows in advanced adjusting method:
Wherein, WpreFor the load of power grid Forward, S 'loadFor the equivalent slope of dynamic factor load curve adjusted,SrampFor the limitation of fired power generating unit climbing rate, tsFor demand response time started, teFor the demand response end time.
4. demand response strategy execution process
After receiving power grid demand response order, first formulates initial demand response policy and carries out equivalent slope calculating,By calculated result compared with the limitation of fired power generating unit climbing rate, demand response function is carried out by limitation if it is no more than the limitation of climbing rateRate quantum chemical method；If the equivalent slope of load curve is limited greater than generator climbing rate, dynamic factor adjustment is carried out, optimization demand is rungEquivalent slope is calculated again after answering strategy, carries out demand response function by limitation if equivalent slope at this time is no more than the limitation of climbing rateRate quantum chemical method；If the dynamic factor adjustment equivalent slope of afterload curve is still greater than the limitation of generator climbing rate, surpassedPreceding adjustment.Demand response strategic process figure is shown in attached drawing 4.
Embodiment:
It is research object that the present embodiment, which chooses somewhere actual electric network, is equipped with 10000 family families and participates in demand response, each householdThere are air-conditioning, water heater and three kinds of electric car intelligent loads in family, operational set point and each relevant physical parameter are with illiteracySpecial calot's method simulation generates.Assuming that load curve highest point is 240MW and fired power generating unit climbing rate is limited to 0.6MW/min.
It is 0.738MW/min that the equivalent slope of demand response preload curve, which is calculated, with equivalent Slope Method.Initially needResponse policy is asked to respond 1 time for intelligent load, 26 DEG C of comfort of air conditioner is hereinafter, 50 DEG C of water heater comfort level or more, electronic vapour90% or more vehicle electricity, load proportion 2: 2: 1 calculate equivalent slope Sload=0.921MW/min.Dynamic factor is adjusted it27 DEG C of air-conditioning room temperature is expanded as hereinafter, 45 DEG C of water heater temperature or more in comfort level section, 80% or more electric car electricity, at this timeThe equivalent slope S of new load curve 'load=0.716MW/min, load curve is as shown in dotted line in attached drawing 5 at this time.
Since load curve is not down to the limitation of fired power generating unit climbing rate hereinafter, also needing to surpass by dynamic factor adjustment at this timePreceding adjustment.It is 798.53 kilowatt hours that the load for needing to move forward is calculated based on equivalent slope, and is adjusted in advance, after adjustmentLoad curve is as shown in dotted line in attached drawing 5.
The advanced adjustment equivalent slope of afterload curve and the limitation of fired power generating unit climbing rate are almost the same, and fired power generating unit goes out at this timePower and load curve are grown simultaneously, and are able to maintain that grid power balances.It i.e. can using the demand response strategy that this patent is mentionedLoad curve is set to be reduced to fired power generating unit climbing rate hereinafter, effectively preventing in high photovoltaic permeability system because photovoltaic rapid drawdown may be ledThe extensive power imbalances caused ensure safe stability of power system.
It should be noted that institute is dissolved to demand response implementation effect is analyzed in embodiment by load curveNew energy is set as photovoltaic, but the present invention is not limited to given embodiment, different new energy types has load curveIt influences, but its principle is all identical.As long as mentioning the demand response strategy institute for considering fired power generating unit climbing rate according to this paperThe work done is in protection scope.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,All technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the artFor those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the inventionRange.