CN110460110A - A kind of demand response policy development method considering the limitation of fired power generating unit climbing rate - Google Patents
A kind of demand response policy development method considering the limitation of fired power generating unit climbing rate Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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Abstract
A kind of demand response policy development method considering the limitation of fired power generating unit climbing rate, for in high photovoltaic permeability electric system, this method calculates the equivalent slope of load curve in certain high photovoltaic permeability zones power grid first, then the equivalent slope of load curve is compared with fired power generating unit climbing rate limits value, corresponding demand response policy is proposed for different comparison results, strategy includes dynamic factor adjusting method and advanced adjusting method, finally verifying can be such that load curve peak value significantly reduces with the demand response policy, and the equivalent slope of load curve is down to fired power generating unit climbing rate limits value or less, successfully manage the extensive power imbalances problem of the possible power grid of photovoltaic power generation rapid decrease, it is significant to safe and stable operation of power system.
Description
Technical 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 system
The 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 as
Gradually 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 reduced
Unit 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 photovoltaic
Generated 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 stopped
Only, 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 normally
Want parameter.Meanwhile climbing rate is the function of unit capacity, size is limited in a certain range.If load curve raised bench
The 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 made
The 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.If
The 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 present
It unites extensive power imbalances problem, but its Construction and operation expense and electric energy loss are higher, and demand response is reasonable distribution
Load side resource, the effective means for promoting grid stability.Rationally electricity is advantageously implemented using the demand response resource of resident side
Force 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 system
The 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 limitation
Slightly formulating method, solves the extensive power imbalances that may cause in high photovoltaic permeability electric system due to photovoltaic power generation rapid drawdown
Problem.
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 power
In 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 limit
System formulates corresponding demand response strategy for the equivalent slope of different load curve, ensures active power balance in electric system；Institute
The 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 Sramp
When, 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~teBetween
The integral of load curve simultaneously replaces it with an area triangle equal thereto, then hypotenuse slope is equivalent replaces load
The 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 curve
Number, tsFor demand response time started, teFor demand response end time, PsFor demand response time started corresponding load function
Rate.
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 as
Under:
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 heat
In 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 grid
The 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 changing
Become.
Further, in the step 3, work as Sload> Sramp, the equivalent slope of load curve is greater than fired power generating unit climbing rate limit
System, 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 is
Demand 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 power
Time, 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 mention
The 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 again
The 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 balance
Height, dynamic factor adjustment are unable to satisfy requirement, are adjusted in advance, when a part of load is advanced to photovoltaic generation power abundance
It 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 possible
Lie 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 case
Corresponding demand response policy can flexibly cope with various power generations in practical power systems, electricity consumption situation, guarantee electric system
Active 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 as
Under:
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 demand
It 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 simultaneously
It is replaced with an area triangle equal thereto, then hypotenuse slope can be equivalent oblique instead of the rising of load curve
Rate.Its physical significance is to replace continually changing slope with constant-slope in the case where issuing additional same charge.Equivalent slope shows
Intention 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 curve
Number, tsFor demand response time started, teFor demand response end time, PsFor demand response time started corresponding load function
Rate.
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 time
Ratio 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 provides
Demand 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 starts
When 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 climbing
Rate limitation calculates demand response power and distribution requirements resource response, sees the t in attached drawing 2s~tdPeriod.tdDemand is rung later
It 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, relaxes
The comfort level section of smart machine promotes the number that smart machine participates in demand response, to obtain more demand response function
Rate, 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 preload
Line, 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 again
The 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 meet
It 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 factor
The demand response power limited that adjusting method can increase.When therefore needing a part of load being advanced to photovoltaic generation power abundance
It 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 rate
Rate 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 rung
Equivalent 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 rate
Rate quantum chemical method；If the dynamic factor adjustment equivalent slope of afterload curve is still greater than the limitation of generator climbing rate, surpassed
Preceding 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 household
There 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 illiteracy
Special 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 need
Response 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 vapour
90% or more vehicle electricity, load proportion 2: 2: 1 calculate equivalent slope Sload=0.921MW/min.Dynamic factor is adjusted it
27 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 time
The 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 time
Preceding 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 adjustment
Load 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 time
Power 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 mentioned
Load 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 led
The 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 curve
New energy is set as photovoltaic, but the present invention is not limited to given embodiment, different new energy types has load curve
It 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 paper
The 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 art
For those of ordinary skill, several improvements and modifications without departing from the principles of the present invention should be regarded as protection of the invention
Range.
Claims (6)
1. a kind of demand response policy development method for considering the limitation of fired power generating unit climbing rate, is used for high photovoltaic permeability power train
In system, it is characterised in that: according to the equivalent slope of actual electric network carry calculation load curve, consider the limitation of fired power generating unit climbing rate,
Corresponding demand response strategy is formulated for the equivalent slope of different load curve, ensures active power balance in electric system；It is described
The formulation of 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, selection
Dynamic factor adjusting method；If dynamic factor S adjustedloadIt is still higher than SrampThen adjusted in advance.
2. a kind of demand response policy development method for considering the limitation of fired power generating unit climbing rate as described in claim 1, special
Sign is: 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~teBetween load
The integral of curve simultaneously replaces it with an area triangle equal thereto, then hypotenuse slope is equivalent replaces load curve
The rate of rise, equivalent slope calculation method is as follows:
Wherein, SloadFor the equivalent slope of load curve, Paffter(t) function changed over time for demand response afterload curve,
tsFor demand response time started, teFor demand response end time, PsFor demand response time started corresponding load power.
3. a kind of demand response policy development method for considering the limitation of fired power generating unit climbing rate as described in claim 1, special
Sign is: 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 as follows:
Sramp=λ Stotal
Wherein, SrampFor the limitation of fired power generating unit climbing rate, λ is fired power generating unit climbing rate, StotalFor in less than hair and stand-by heat
Fired power generating unit capacity summation.
4. a kind of demand response policy development method for considering the limitation of fired power generating unit climbing rate as described in claim 1, special
Sign is: in the step 3, working as Sload≤Sramp, the demand response strategy of script enables to load curve equivalent tiltedly in power grid
Rate is limited no more than fired power generating unit climbing rate, is able to maintain that grid power balances, demand response strategy is without changing.
5. a kind of demand response policy development method for considering the limitation of fired power generating unit climbing rate as described in claim 1, special
Sign is: in the step 3, working as Sload> Sramp, the equivalent slope of load curve is limited greater than fired power generating unit climbing rate, current to need
The demand response underpower for asking response policy to provide is to maintain grid power to balance；
In ts~tdPeriod first limits according to climbing rate and calculates demand response power and distribution requirements resource response, tsFor demand
Respond time started, tdFor demand response power be no longer able to make load curve be maintained at the limitation of generator climbing rate it is below when
Between, 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 promote intelligence
Energy equipment participates in the number of demand response, to obtain more demand response power；
After dynamic factor adjustment, with tdThe demand response time started t calculated for a new rounds', dynamic factor adjustment is calculated again
The equivalent slope S of load curve afterwards 'load, and and SrampCompare, if S 'load≤Sramp, then dynamic factor adjusts and terminates.
6. a kind of demand response policy development method for considering the limitation of fired power generating unit climbing rate as claimed in claim 5, special
Sign is: in the step 3, as S 'load> Sramp, demand response power needed for maintaining grid power to balance is excessively high, dynamic factor
Adjustment is unable to satisfy requirement, is adjusted in advance, use when a part of load is advanced to photovoltaic generation power abundance, advanced to adjust
The load calculation method that moves forward in whole method is as follows:
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.
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