CN109659958A - A kind of electric system and its peak-frequency regulation method - Google Patents
A kind of electric system and its peak-frequency regulation method Download PDFInfo
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Abstract
The invention discloses a kind of electric system and its peak-frequency regulation method, include the following steps: the control condition and frequency variation that obtain electric system；Phase-change thermal storage station waist lotus period maximum quantity of heat storage and the exothermic maximum demand of low-valley interval in electric system are determined according to control condition；The peak capacity increment of electric system is calculated according to maximum quantity of heat storage and exothermic maximum demand；Frequency modulation is carried out to electric system according to the low frequency signal in frequency variation.By implementing the present invention, for the electric system for installing phase-change thermal storage station additional, obtain the maximum peak capacity increment of electric system, slow response and the big feature of heat storage capacity due to distributed phase-change thermal storage station make it possible to the deficiency for making up conventional mode of frequency regulation, spinning reserve capacity needed for power grid can be substantially reduced, the spinning reserve capacity saved because distributed phase-change thermal storage station participates in frequency modulation can be used for peak load regulation network, emergency duty etc., can further promote the safety and reliability of Operation of Electric Systems.
Description
Technical field
The present invention relates to peak-frequency regulation technical fields, and in particular to a kind of electric system and its peak-frequency regulation method.
Background technique
Cogeneration units development in recent years is very fast, installed capacity up to 300,000,000 kilowatts, Zhan Huo electricity installed capacity it is close
30%.In March, 2016, National Development and Reform Committee, Bureau of Energy etc., which combine, has promulgated " cogeneration of heat and power management method ", sends out for cogeneration of heat and power
Open up lag issues, it is desirable that northern large- and-medium size cities cogeneration of heat and power central heating rate reaches 60% or more.Not with energy-saving and emission-reduction
Disconnected to promote, China's Areas benefiting from central heating are still increasing year by year, it is contemplated that future will have more coal units to carry out heat supply transformation or new
Increase cogeneration units.
Conventional rack heat supply period takes the method for operation of " electricity determining by heat ", and peak-frequency regulation ability is limited, existing thermoelectricity unit
Generally use and increase the mode of regenerative apparatus and improve the peak-frequency regulation ability of thermoelectricity unit, increased regenerative apparatus can by
Different periods, which store heat and release heat, improves energy utilization rate, but the status mutually restricted for heat and generating power does not change,
Limit due to the restriction of the conditions such as quantity of steam and flow in existing regenerative apparatus such as heat pump device, between generated energy and heating load
System is more prominent, and peak-frequency regulation ability is limited.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of electric system and its peak-frequency regulation method, to solve existing skill
In art in regenerative apparatus such as heat pump device the conditions such as quantity of steam and flow restriction, the limitation between generated energy and heating load is more
Add protrusion, the limited problem of peak-frequency regulation ability.
Technical solution proposed by the present invention is as follows:
The embodiment of the invention provides a kind of peak-frequency regulation method of electric system, which includes following step
It is rapid: to obtain the control condition and frequency variation of the electric system；It is determined in the electric system according to the control condition
The exothermic maximum demand of phase-change thermal storage station waist lotus period maximum quantity of heat storage and low-valley interval；According to the maximum quantity of heat storage and most
Big heat release demand calculates the peak capacity increment of the electric system；According to the low frequency signal in the frequency variation to described
Electric system carries out frequency modulation.
Further, the control condition and frequency variation of the electric system are obtained, comprising: obtain the electric system
The constraint condition of middle thermoelectricity unit, the boundary condition of the constraint condition at phase-change thermal storage station and phase-change thermal storage station and electric system
Frequency variation.
Further, the constraint condition of the thermoelectricity unit includes: and runs constraint condition, climbing rate constraint condition, heat to bear
Lotus constraint condition；The constraint condition at the phase-change thermal storage station includes: capacity constraints, heat balance constraint condition；The phase
The boundary condition for becoming heat accumulation station includes: that heat storage capacity boundary condition, heat accumulation surplus boundary condition, maximum fill thermal power perimeter strip
Part, exothermic maximum power boundary condition, unit thermal load demands boundary condition and next stage peak modulation capacity boundary condition.
Further, determine that the maximum of phase-change thermal storage station waist lotus period stores up in the electric system according to the control condition
The exothermic maximum demand of heat and low-valley interval, comprising: according to the constraint condition of thermoelectricity unit, phase transformation in the electric system
The constraint condition at heat accumulation station and the boundary condition at phase-change thermal storage station determine the phase-change thermal storage station waist lotus period in the electric system
The exothermic maximum demand of maximum quantity of heat storage and low-valley interval.
Further, increased according to the peak capacity that the maximum quantity of heat storage and exothermic maximum demand calculate the electric system
Amount, comprising: phase-change thermal storage station low-valley interval in the electric system is calculated according to the maximum quantity of heat storage and exothermic maximum demand
Downward peak capacity and spike period upward peak capacity；It is added the downward peak capacity to obtain institute with upward peak capacity
State the peak capacity increment of electric system.
Further, frequency modulation is carried out to the electric system according to the low frequency signal in the frequency variation, comprising: root
Power offset value is calculated according to the low frequency signal, power adjustment value is obtained according to the power offset value；According to the power tune
The power adjustment value is divided into four sections by the size of section value；Section where the power adjustment value is to the electric power
System carries out frequency modulation.
Further, power offset value is calculated according to the low frequency signal, power tune is obtained according to the power offset value
Section value, comprising: according in the low frequency signal graded portion calculate power offset value, by the power offset value through filtering and
Proportional integration adjusts to obtain power adjustment value.
Further, the power adjustment value is divided by four sections according to the size of the power adjustment value, comprising: root
According to the size of the power adjustment value absolute value, the power adjustment value is divided into locking regulatory region, normal regulating area, advance notice tune
Save area and regulatory region of being in an emergency.
The embodiment of the present invention also provides a kind of electric system, the electric system include: phase-change thermal storage station, thermoelectricity unit and from
Dynamic electricity generation system, the automatic power generation system use the peak-frequency regulation method pair of the described in any item electric system of above-described embodiment
The thermoelectricity unit of electric system carries out peak-frequency regulation.
Technical solution proposed by the present invention, has the advantages that
The peak-frequency regulation method of electric system provided in an embodiment of the present invention, for the electricity for installing distributed phase-change thermal storage station additional
Force system carries out peak-frequency regulation using the thermoelectricity unit in automatic power generation system auxiliary power system, when thermoelectricity unit quantity of heat production
When larger, other than meeting thermic load, extra heat is stored in distributed phase-change thermal storage station.When thermoelectricity unit quantity of heat production
When being unsatisfactory for thermic load, insufficient heat can be provided by distributed phase-change thermal storage station.Pass through phase change material device tunable heat in this way
Motor group participates in electric system peak regulation, can obtain maximum peak capacity increment, meanwhile, phase-change thermal storage station can be in one minute
AGC dispatch command is completed, it is slower than the frequency modulation resource response speed such as conventional rack and battery energy storage, it can be with other conventional racks
It works in coordination, by the respective power output size of AGC system coordinated control, completes to reach mains frequency to the frequency modulation of electric system
Dynamic stability, guarantee power supply quality.
Electric system provided in an embodiment of the present invention, by the way that distributed phase-change heat accumulation system is added in thermoelectricity unit, by
In phase-change thermal storage station, response speed is slow, and power handling capacity is strong, and adjusting direction two-way can change, with conventional variable frequency power source phase
In conjunction with, can be used as auxiliary conventional rack peak regulation effective means.The slow response at distributed phase-change thermal storage station is big with heat storage capacity
The characteristics of make it possible to the deficiency for making up conventional mode of frequency regulation, spinning reserve capacity needed for power grid can be substantially reduced, because distribution
The spinning reserve capacity that formula phase-change thermal storage station participates in frequency modulation and saves can be used for peak load regulation network, emergency duty etc., can be further
Promote the safety and reliability of Operation of Electric Systems.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art be briefly described, it should be apparent that, it is described below
Attached drawing is some embodiments of the present invention, for those of ordinary skill in the art, before not making the creative labor
It puts, is also possible to obtain other drawings based on these drawings.
Fig. 1 is the peak-frequency regulation method flow diagram of electric system according to an embodiment of the present invention；
Fig. 2 is the thermoelectricity unit operational mode figure according to an embodiment of the present invention for installing phase-change thermal storage station additional；
Fig. 3 is the Electrothermal Properties curve graph before and after thermoelectricity unit installation according to an embodiment of the present invention phase-change thermal storage station；
Fig. 4 is the peak-frequency regulation method flow diagram of electric system according to an embodiment of the present invention；
Fig. 5 is that regulatory region phase-change thermal storage station tune is predicted in the peak-frequency regulation method of electric system according to an embodiment of the present invention
Save the curve graph of changed power；
Fig. 6 is different phase-change thermal storages station capacity accounting in the peak-frequency regulation method of electric system according to an embodiment of the present invention
When PDV standard deviation change curve；
When Fig. 7 is that phase-change thermal storage station energy is unrestricted in the peak-frequency regulation method of electric system according to an embodiment of the present invention
The change curve of PDV standard deviation；
Fig. 8 is the structural block diagram of electric system according to an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those skilled in the art are not having
Every other embodiment obtained under the premise of creative work is made, shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of peak-frequency regulation method of electric system, as shown in Figure 1, the peak-frequency regulation method packet
Include following steps:
Step S1: the control condition and frequency variation of electric system are obtained.Specifically, electric system includes automatic generation
System (Automatic Generation Control, AGC) and the thermoelectricity unit for adding distributed phase-change thermal storage station, are obtained
The control condition at phase-change thermal storage station and thermoelectricity unit is taken, obtaining mains frequency changing value is frequency variation.
Step S2: phase-change thermal storage station waist lotus period maximum quantity of heat storage and low ebb in electric system are determined according to control condition
The exothermic maximum demand of period.Specifically, in order to obtain maximum peak capacity increment, phase-change thermal storage station is run in electric system
When need to store heat in waist lotus and peak load period, when the thermoelectricity unit generated energy period at a low ebb releases heat in electric system
Amount.
Step S3: the peak capacity increment of electric system is calculated according to maximum quantity of heat storage and exothermic maximum demand.Specifically,
After determining maximum quantity of heat storage and exothermic maximum demand, determine that the peak capacity of electric system increases according to the size of the two values
Amount.
Step S4: frequency modulation is carried out to electric system according to the low frequency signal in frequency variation.Specifically, frequency is decomposited
Low frequency signal in variable quantity is believed low frequency signal as the control for the thermoelectricity unit output for adding distributed phase-change thermal storage station
Number, frequency modulation is carried out to thermoelectricity unit.
S1 to step S4 through the above steps, the peak-frequency regulation method of electric system provided in an embodiment of the present invention, for
The electric system for installing distributed phase-change thermal storage station additional, is adjusted using the thermoelectricity unit in automatic power generation system auxiliary power system
Extra heat other than meeting thermic load, is stored in distributed phase transformation and stored up by peak frequency modulation when thermoelectricity unit quantity of heat production is larger
In heat stations.When thermoelectricity unit quantity of heat production is unsatisfactory for thermic load, insufficient heat can be provided by distributed phase-change thermal storage station.It is logical in this way
It crosses phase change material device tunable thermoelectricity unit and participates in electric system peak regulation, maximum peak capacity increment can be obtained, meanwhile,
Phase-change thermal storage station can complete AGC dispatch command in one minute, than the frequency modulation such as conventional rack and battery energy storage resource response speed
Degree is slow, can work in coordination with other conventional racks, by the respective power output size of AGC system coordinated control, completes to electric power
The frequency modulation of system reaches the dynamic stability of mains frequency, guarantees power supply quality.
As a kind of optional embodiment of the present embodiment, the control condition obtained in above-mentioned steps S1 includes: power train
The boundary condition of the constraint condition of thermoelectricity unit, the constraint condition at phase-change thermal storage station and phase-change thermal storage station in system.Specifically, thermoelectricity
The constraint condition of unit includes: operation constraint condition, climbing rate constraint condition, thermic load constraint condition；The pact at phase-change thermal storage station
Beam condition includes: capacity constraints, heat balance constraint condition；The boundary condition at phase-change thermal storage station includes: heat storage capacity side
Boundary's condition, heat accumulation surplus boundary condition, maximum fill thermal power boundary condition, exothermic maximum power boundary condition, unit thermic load
Demand boundary condition and next stage peak modulation capacity boundary condition.
After installing phase-change thermal storage station additional in thermoelectricity unit, the operation constraint condition of thermoelectricity unit can be indicated with formula (1),
Wherein, Ht,iFor the heat power output of i-th thermoelectricity unit t moment, Pt,iElectricity for i-th thermoelectricity unit t moment is contributed,
Pel,minThe minimum electricity power output of thermoelectricity unit, k when for pure condensate operating conditionv2Air inflow constant feelings when electricity power output minimum for pure condensate operating condition
Per the reduction amounts for increasing electricity power output when unit heat is contributed, h under condition moremedHeat power output when contributing for thermoelectricity unit minimum technology, h0
For constant, kmThe proportionality coefficient of electricity power output and heat power output, h when for back pressure operating conditionh,maxWhen contributing for thermoelectricity unit maximum technology
Heat power output.
The climbing rate constraint condition of thermoelectricity unit can be indicated with formula (2):
Wherein, Pup,iAnd Pdown,iRespectively i-th thermoelectricity unit be upward, the constraint of downward climbing rate, Pt-1,iFor i-th heat
The electricity power output at motor group t-1 moment.
The thermic load constraint condition of thermoelectricity unit can be indicated with formula (3):
Hout,t+Hd,t=Hload,t (3)
Wherein, Hout,tHeat release power for phase-change thermal storage station in t moment, Hd,tFor thermoelectricity unit directly feed for hot merit
The sum of rate, Hload,tFor the thermal load demands of thermoelectricity unit.
The capacity constraints at phase-change thermal storage station are indicated with formula (4):
Wherein, PHRFor phase-change thermal storage station heat release power, Pmax,rFor phase-change thermal storage station exothermic maximum power.PHAFor phase transformation storage
Heat stations heat accumulation power, Pmax,aFor phase-change thermal storage station maximum heat accumulation power.
The heat balance constraint condition at phase-change thermal storage station is indicated with formula (5):
Wherein, Hx,t、Hx,oRespectively quantity of heat storage of the phase-change thermal storage station x in original state and t moment, ηa,x、ηr,xRespectively
The heat accumulation efficiency and exothermal efficiency of phase-change thermal storage station x, Pa,x、Pr,xRespectively the heat accumulation power of phase-change thermal storage station x and heat release power,
Hs,xFor the rated capacity at phase-change thermal storage station.
As a kind of optional embodiment of the present embodiment, according to the constraint condition of above-mentioned thermoelectricity unit, phase-change thermal storage station
Constraint condition and phase-change thermal storage station the control conditions such as boundary condition, it can be deduced that phase-change thermal storage station is in the waist lotus period most
Big quantity of heat storage is indicated with formula (6):
Wherein, SmaxFor phase-change thermal storage station maximum heat storage capacity,T moment phase transformation is in for waist lotus and peak load period
The maximum heat accumulation power in heat accumulation station, TFIt indicates to be in the waist lotus period.
Phase-change thermal storage station is indicated in the exothermic maximum demand of low-valley interval with formula (7):
Wherein,For the thermal power that low-valley interval phase-change thermal storage station should compensate, TLIndicate the period at a low ebb.
As a kind of optional embodiment of the present embodiment, above-mentioned steps S3, according to maximum quantity of heat storage and exothermic maximum need
Seek the peak capacity increment for calculating electric system, comprising: calculate in electric system according to maximum quantity of heat storage and exothermic maximum demand
The downward peak capacity of phase-change thermal storage station low-valley interval and spike period upward peak capacity；By downward peak capacity and upward peak regulation
Capacity is added to obtain the peak capacity increment of electric system.
Specifically, when maximum quantity of heat storage H is calculateda,FWith exothermic maximum demand Hr,LAfterwards, compare Ha,FAnd Hr,LSize,
H can be divided intoa,FLess than Hr,LAnd Ha,FMore than or equal to Hr,LTwo kinds of situations calculate the peak capacity increment of electric system.
Work as Ha,FLess than Hr,LWhen, it need to be in order to obtain maximum peak capacity increment, when distributed phase-change thermal storage station is run
Waist lotus and peak load period store heat, release heat when the thermoelectricity unit generated energy period at a low ebb.This moment, distributed phase transformation
The heat accumulation station period at a low ebb, the maximum of complementary heating be averaged thermal power with formula (8) indicate:
Wherein, TdownIt is phase-change thermal storage station in the duration of thermoelectricity unit generated energy period complementary heating at a low ebb,
Ha,PIt indicates that phase-change thermal storage station is in peak load period maximum quantity of heat storage, can be indicated with formula (9):
TPIt indicates to be in the peak load period.
It is corresponding to be indicated in the downward peak capacity of low-valley interval with formula (10):
In order to reach phase-change thermal storage station in the exothermic demand of low-valley interval, the average heat accumulation reached in the spike period
Power can be indicated with formula (11):
Wherein, TupThe duration of spike period complementary heating is in thermoelectricity unit generated energy for phase-change thermal storage station.
It is corresponding to be indicated in spike period upward peak capacity with formula (12):
According to above-mentioned formula (8) to the available peak capacity increment of formula (12), indicated with formula (13):
Work as Ha,FMore than or equal to Hr,LWhen, in order to obtain maximum peak capacity increment, when distributed phase-change thermal storage station is run,
When pressing maximum capacity storage heat in the waist lotus period, then meet the heat demand of using of period at a low ebb first, it is remaining
Heat is used further to meet spike period heat demand, because phase-change thermal storage amount is sufficient, distributed phase-change thermal storage station can achieve place
In the exothermic maximum demand of low-valley interval, so the maximum of period at a low ebb supplement is averaged, thermal power is indicated with formula (14):
Wherein,It is horizontal for the thermic load in t moment.
The corresponding peak capacity promoted is indicated with formula (15):
By formula (14) and formula (15) it can be concluded that, if the capacity and power at distributed phase-change thermal storage station are unrestricted
System, by using heat accumulation arbitrary way, can be reduced to the smallest value for the minimum load of electric system.Distributed phase-change thermal storage
After the heat release demand for packing sufficient low-valley interval, remaining heat is used to meet the heat release demand of spike period, is in the spike period
When, the maximum thermal power mean value formula (16) that can be supplemented indicates:
The corresponding peak capacity promoted can be indicated with formula (17):
According to above-mentioned formula (14) to the available peak capacity increment of formula (17), indicated with formula (18):
According to the thermoelectricity unit day tune behind formula (13) and formula (18) available installation distributed phase-change thermal storage station
Peak capacity is indicated with formula (19):
C=C0+ΔC (19)
Wherein, C0Indicate the thermoelectricity unit day peak capacity for not installing distributed phase-change thermal storage station additional.
In practical applications, the operational mode of the thermoelectricity unit at distributed phase-change thermal storage station is installed additional as shown in Fig. 2, phase transformation is stored up
Heat stations can store heat using the peak-frequency regulation method of above-mentioned electric system when thermoelectricity unit is to thermic load heat supply, install distribution additional
The traffic coverage of thermoelectricity unit is as shown in figure 3, dotted line indicates to install the heat at distributed phase-change thermal storage station additional before and after formula phase-change thermal storage station
Motor group, solid line indicate the thermoelectricity unit for not installing distributed phase-change thermal storage station additional, it can be seen that install distributed phase-change thermal storage station additional
Thermoelectricity unit expanded the electric heating traffic coverage of unit.It obtains installing distributed phase-change thermal storage station additional by experimental calculation simultaneously
The total peak capacity of thermoelectricity unit is 111.5MW, and total peak capacity than the thermoelectricity unit of non-phase-change thermal storage station heat accumulation improves about
2.6 again.
As a kind of optional embodiment of the present embodiment, as shown in figure 4, step S4 is according to the low frequency in frequency variation
Signal carries out frequency modulation to electric system, comprising:
Step S41: power offset value is calculated according to low frequency signal, power adjustment value is obtained according to power offset value.Specifically
Ground calculates power offset value according to the graded portion in low frequency signal, and power offset value is adjusted through filtering and proportional integration
To power adjustment value.
Step S42: power adjustment value is divided by four sections according to the size of power adjustment value.Specifically, according to power
Power adjustment value is divided into locking regulatory region, normal regulating area, advance notice regulatory region and adjusting of being in an emergency by the size of regulated value absolute value
Area.
Step S43: frequency modulation is carried out to electric system according to the section where power adjustment value.Specifically, in different sections
It is interior, the regulated quantity that automatic power generation system is distributed to phase-change thermal storage station is calculated, to obtain the frequency regulating amount of thermoelectricity unit.
Specifically, low-pass filter can be simulated using Chebyshev and the frequency variation of power grid is decomposed into high-frequency signal
And low frequency signal can be set as height frequency for one minute since phase-change thermal storage station can respond the frequency modulation demand of minute grade
Separation, 30Hz is set to the cutoff frequency of low frequency, using there are amplitudes in the passband of chebyshev low-pass filter
The low frequency signal of minute grade is further decomposed into fast change part and graded portion according to rate of change by the characteristics of fluctuation, and is become fastly
Part signal fluctuation range is big, and graded portion signal fluctuation range is small.
High-frequency signal and the fast part that becomes are passed through clipping by the peak-frequency regulation method of electric system provided in an embodiment of the present invention
Pass through clipping as traditional frequency modulation unit and the fm control signal of other frequency modulation resources power output, graded portion after equipment processing
Fm control signal after equipment processing as the thermoelectricity unit output for adding distributed phase-change thermal storage station, to realize to heat
The frequency modulation of motor group.Above-mentioned two classes frequency modulation resource cooperates, by the respective power output size of automatic power generation system coordinated control,
Corresponding mains frequency fluctuation is eliminated, the dynamic stability of mains frequency has been reached, guarantees power supply quality.
In the peak-frequency regulation method of electric system provided in an embodiment of the present invention, automatic power generation system is according in low frequency signal
Graded portion calculate power offset value (Power deviation value, PDV), according to power offset value by filtering and
Proportional integration adjusts to obtain power adjustment requirements (Power regulation requirement, PRR).Wherein, PDV indicates area
Generate electricity in domain and the imbalance power between load, i.e., when disturbing occurs in load or deviation occurs in generating set, cause be
It unites frequency departure a reference value, the exchange power on interconnection deviates scheduled planned value, and generating set increases or reduces at this time
Its total amount of contributing.
In the peak-frequency regulation method of electric system provided in an embodiment of the present invention, according to the size of power adjustment value absolute value
Different control intervals is divided into, that is, is latched regulatory region, normal regulating area, predicts regulatory region and regulatory region of being in an emergency, specifically,
The regulated quantity distributed by calculating automatic power generation system to phase-change thermal storage station in four different sections, to obtain thermoelectricity unit
Frequency regulating amount.
When PRR, which is in, is in an emergency area, AGC system is indicated to the regulated quantity that phase-change thermal storage station is distributed with formula (20):
Wherein, Δ Pc,xIndicate the current power in phase-change thermal storage station, Pa,xAnd Pr,xFor the specified heat accumulation power at phase-change thermal storage station
And specified heat release power.
If whole phase-change thermal storages stationThe sum of be greater than | PRR |, then be scaled and add phase-change thermal storage station
Thermoelectricity unit regulated quantity；Otherwise, remaining regulated quantity issues power output by traditional frequency modulation unit and other frequency modulation resources in proportion.
When PRR is in advance notice regulatory region, AGC system is indicated to the regulated quantity that phase-change thermal storage station is distributed with formula (21):
Wherein, Δ PTIndicate that whole frequency modulation resources (including conventional electric generators and add the thermoelectric perpetual motion machine at phase-change thermal storage station
Group) regulation power, according to the direction calculating of PRR raise or lower general power, be power P RRERegulatory demand is in advance notice
Upper limit value when regulatory region.If | PRR | > Δ PT, then k value is 0, when | PRR |≤Δ PTWhen, k is phase-change thermal storage station regulation power
The slope of variation, as shown in Figure 5.And if all phase-change thermal storage stationsThe sum of be greater than | PRR |, then be scaled plus
The regulated quantity of thermoelectricity unit equipped with phase-change thermal storage station；Otherwise, remaining regulated quantity is by conventional electric power generation unit and other frequency modulation
Resource issues power output.
When PRR is in normal regulating area, AGC system is indicated to the regulated quantity that phase-change thermal storage station is distributed with formula (22):
When PRR is in locking regulatory region, for AGC system according to the basic point power reported, issuing allows to add phase transformation storage
The adjustment amount of the thermoelectricity unit of heat stations.The thermoelectricity unit at phase-change thermal storage station is added according to the comprehensive determining base of constraint condition of itself
Point powerThen the cogeneration units power adjustment formula (23) for adding phase-change thermal storage station indicates:
PRR will not be caused beyond locking in order to guarantee to add the power output adjustment of the cogeneration units at phase-change thermal storage station
Area, AGC system are indicated to the regulated quantity formula (24) to formula (26) that phase-change thermal storage station is distributed:
WhenWhen:
WhenWhen:
When other situations:
Wherein, PRRDUpper limit value when locking regulatory region is in for power adjustment requirements,At the PRR of phase-change thermal storage station
The amount of adjusting upward when being latched regulatory region,Downward adjustment amount when locking regulatory region is in for phase-change thermal storage station PRR.
Specifically, it is emulated for the peak-frequency regulation method of electric system, basic point power is determined according to table 1
Table 1
| The residual capacity at phase-change thermal storage station | Basic point power |
| Lower than 1/3 | Negative value (heat accumulation state) |
| Greater than 1/3, less than 2/3 | Zero |
| Higher than 2/3 | Positive value (heat release state) |
Traditional frequency modulation unit is successively exited from small to large according to frequency regulation capacity in emulation, and reduced unit frequency regulation capacity is used
Distributed phase-change thermal storage station power output is supplied, the principle for keeping the total frequency regulation capacity of system constant.Frequency modulation effect is measured with PDV, when it
Numerical value is smaller, shows that the amplitude of variation of PDV is smaller, and the effect for participating in electric electric system peak-frequency regulation is better.Emulation obtains not
It is as shown in Figure 6 with corresponding PDV standard deviation variation tendency when the accounting of phase-change thermal storage station.Fig. 6 shows with distributed phase-change thermal storage
The increase in the frequency regulation capacity accounting of standing, PDV standard deviation first drops to be risen afterwards, shows that distributed phase-change thermal storage station accounts for the ratio of frequency regulation capacity
The more example not the more reasonable.
When assuming that the energy at distributed phase-change thermal storage station is unrestricted in emulation, the frequency modulation effect of Simulation Control strategy is such as
Shown in Fig. 7.Due to the limitation of not no energy, the effect that control strategy considers phase-change thermal storage station characteristic in detail is embodied.Remove phase
Except becoming heat accumulation station accounting as 100% point, with the increasing of phase-change thermal storage station accounting, the standard deviation of PDV is gradually reduced
Trend, and decline by a big margin, embody in the thermoelectricity connection for adding phase-change thermal storage station based on section flexible allocation locating for PRR
It produces unit and undertakes preferable frequency modulation effect under regulated quantity strategy.
The peak-frequency regulation method of electric system provided in an embodiment of the present invention constructs installation distributed phase-change thermal storage station
Afterwards, thermoelectricity unit is climbed after thermoelectricity unit operation constraint condition, phase-change thermal storage station capacity constraints, installation phase-change thermal storage station
Rate constraint condition, thermic load constraint condition and distributed phase-change thermal storage station heat balance constraint condition.It constructs for heat accumulation
Capacity, heat accumulation surplus, maximum fill the control such as thermal power, exothermic maximum power, unit thermal load demands, next stage peak modulation capacity side
Boundary's condition, analysis compare the maximum quantity of heat storage that distributed phase-change thermal storage station is in the waist lotus period and period at a low ebb most
Big heat release demand.Construct according to distributed phase-change thermal storage station be in the waist lotus period maximum quantity of heat storage and the period at a low ebb
Exothermic maximum demand size, determine the operation reserve and its increased scheduling peak regulation appearance that distribution phase-change thermal storage station is taken
Measure increment.The effect that peak modulation capacity is improved behind thermoelectricity unit installation phase-change thermal storage station is divided in conjunction with emulation and actual experiment
Analysis.
The peak-frequency regulation method of electric system provided in an embodiment of the present invention proposes a kind of pair of frequency variation and carries out two
The method of secondary frequency dividing carries out quantitative analysis to the specific gravity of the high fdrequency component of real system first, simulates low pass using Chebyshev
Mains frequency changing value Δ f is decomposed into high-frequency signal and low frequency signal by filter.For Chebyshev filter in passband
Inside there are the characteristics that amplitude fluctuation, it is partially and gradual that the low frequency signal of minute grade is further decomposed into fast change according to rate of change
Partial method, and fast change part signal fluctuation range is big, graded portion signal fluctuation range is small.Phase transformation storage is added to realize
The thermoelectricity unit of heat stations and conventional rack coordinated control are contributed, and realize optimal coordination mode；A kind of automatic power generation system (AGC)
Thermoelectricity unit for adding distributed phase-change thermal storage station participates in the capacity requirement and its control strategy of frequency modulation, and control centre is straight
The method for receiving and sending instruction to the AGC system containing distributed phase-change thermal storage station.When the thermoelectricity unit for adding phase-change thermal storage station is joined
When with frequency modulation, AGC system is evaded while giving full play to its energy-storage property feature according to the slow-footed feature of its power regulation
The limited constraint of its total capacity.Based on section locating for PRR issue adjustment add phase-change thermal storage station cogeneration units or
The strategy of the target of conventional rack and other frequency modulation resources power output.In conjunction with the operation data of actual electric network, stored up to phase transformation is installed additional
The effect that the control strategy of fm capacity is improved after heat stations is analyzed.
The embodiment of the present invention also provides a kind of electric system, as shown in figure 8, the electric system include: phase-change thermal storage station 1,
Thermoelectricity unit 2 and automatic power generation system 3,3 system of automatic generation system use the peak regulation of the electric system in any of the above-described embodiment
Frequency modulation method carries out peak-frequency regulation to the thermoelectricity unit 2 of electric system.
Wherein, elementary object when automatic power generation system 3 carries out peak-frequency regulation to the thermoelectricity unit 2 of electric system is to guarantee
Generated output and balancing the load, guarantee system frequency are rated value, make net region interconnection trend and equal, the Minimum Area of plan
Change operating cost.Phase-change thermal storage station 1 and thermoelectricity unit 2 adjust power output to track AGC control instruction, compensate load disturbance and unit
The deviation of power output, so that system frequency is restored to a reference value, dominant eigenvalues to restore to planned value.
Electric system provided in an embodiment of the present invention, by the way that distributed phase-change thermal storage station 1 is added in thermoelectricity unit 2, by
In phase-change thermal storage station, 1 response speed is slow, and power handling capacity is strong, and adjusting direction two-way can change, with conventional variable frequency power source
It combines, can be used as the effective means of auxiliary conventional rack peak regulation.The slow response at distributed phase-change thermal storage station 1 and heat storage capacity
Big feature makes it possible to the deficiency for making up conventional mode of frequency regulation, can substantially reduce spinning reserve capacity needed for power grid, because dividing
The spinning reserve capacity that cloth phase-change thermal storage station 1 participates in frequency modulation and saves can be used for peak load regulation network, emergency duty etc., can be into one
Step promotes the safety and reliability of Operation of Electric Systems.
Specific embodiment is applied in the present invention, and principle and implementation of the present invention are described, above embodiments
Explanation be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art,
According to the thought of the present invention, there will be changes in the specific implementation manner and application range, in conclusion in this specification
Appearance should not be construed as limiting the invention.It is made to the above embodiment according to the technical essence of the invention simply to repair
Change, still falls within the range of technical solution of the present invention.
Claims (9)
1. a kind of peak-frequency regulation method of electric system, which comprises the steps of:
Obtain the control condition and frequency variation of the electric system；
When determining in the electric system phase-change thermal storage station waist lotus period maximum quantity of heat storage and low ebb according to the control condition
The exothermic maximum demand of section；
The peak capacity increment of the electric system is calculated according to the maximum quantity of heat storage and exothermic maximum demand；
Frequency modulation is carried out to the electric system according to the low frequency signal in the frequency variation.
2. the peak-frequency regulation method of electric system according to claim 1, which is characterized in that obtain the electric system
Control condition and frequency variation, comprising:
Obtain the side of the constraint condition of thermoelectricity unit, the constraint condition at phase-change thermal storage station and phase-change thermal storage station in the electric system
Boundary's condition and the frequency variation of electric system.
3. the peak-frequency regulation method of electric system according to claim 2, which is characterized in that
The constraint condition of the thermoelectricity unit includes: operation constraint condition, climbing rate constraint condition, thermic load constraint condition；
The constraint condition at the phase-change thermal storage station includes: capacity constraints, heat balance constraint condition；
The boundary condition at the phase-change thermal storage station includes: that heat storage capacity boundary condition, heat accumulation surplus boundary condition, maximum fill hot merit
Rate boundary condition, exothermic maximum power boundary condition, unit thermal load demands boundary condition and next stage peak modulation capacity boundary
Condition.
4. the peak-frequency regulation method of electric system according to claim 2, which is characterized in that true according to the control condition
The maximum quantity of heat storage of phase-change thermal storage station waist lotus period and the exothermic maximum demand of low-valley interval in the fixed electric system, packet
It includes:
According to the side of the constraint condition of thermoelectricity unit, the constraint condition at phase-change thermal storage station and phase-change thermal storage station in the electric system
Boundary's condition determines the maximum quantity of heat storage of phase-change thermal storage station waist lotus period and the exothermic maximum of low-valley interval in the electric system
Demand.
5. the peak-frequency regulation method of electric system according to claim 1, which is characterized in that according to the maximum quantity of heat storage
The peak capacity increment of the electric system is calculated with exothermic maximum demand, comprising:
It is downward that phase-change thermal storage station low-valley interval in the electric system is calculated according to the maximum quantity of heat storage and exothermic maximum demand
Peak capacity and spike period upward peak capacity；
The downward peak capacity is added to obtain the peak capacity increment of the electric system with upward peak capacity.
6. the peak-frequency regulation method of electric system according to claim 1, which is characterized in that according to the frequency variation
In low frequency signal to the electric system carry out frequency modulation, comprising:
Power offset value is calculated according to the low frequency signal, power adjustment value is obtained according to the power offset value；
The power adjustment value is divided into four sections according to the size of the power adjustment value；
Section where the power adjustment value carries out frequency modulation to the electric system.
7. the peak-frequency regulation method of electric system according to claim 6, which is characterized in that according to the low frequency signal meter
Power offset value is calculated, power adjustment value is obtained according to the power offset value, comprising:
Power offset value is calculated according to the graded portion in the low frequency signal, by the power offset value through filtering and ratio product
Divide to adjust and obtains power adjustment value.
8. the peak-frequency regulation method of electric system according to claim 6, which is characterized in that according to the power adjustment value
Size the power adjustment value is divided into four sections, comprising:
According to the size of the power adjustment value absolute value, by the power adjustment value be divided into locking regulatory region, normal regulating area,
Predict regulatory region and regulatory region of being in an emergency.
9. a kind of electric system characterized by comprising phase-change thermal storage station, thermoelectricity unit and automatic power generation system,
The automatic power generation system is using the peak-frequency regulation method of the described in any item electric system of claim 1-8 to electric power
The thermoelectricity unit of system carries out peak-frequency regulation.
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