CN106780103A - A kind of direct current cooker, steam turbine, electric network coordination control method for primary frequency modulation analysis - Google Patents
A kind of direct current cooker, steam turbine, electric network coordination control method for primary frequency modulation analysis Download PDFInfo
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Abstract
A kind of direct current cooker, steam turbine, electric network coordination control method for primary frequency modulation analysis, direct current cooker, steam turbine, electric network coordination control method the present invention relates to be used for primary frequency modulation analysis.The present invention participates in primary frequency modulation and brings high resistance in order to solve the characteristic that prior art does not account for boiler, to Large Copacity high parameter fired power generating unit, is unfavorable for the problem of power system safety and stability operation.Step of the present invention is：One：Direct current cooker energy state analysis is carried out, direct current cooker energy state is determined；Two：Power grid energy state analysis is carried out, power grid energy state is determined；Three：The power grid energy state that the direct current cooker energy state and step 2 determined according to step one determine, it is determined that net source energy compatibility control strategy.The present invention makes fired power generating unit fully to participate in frequency modulation on the premise of electric power netting safe running requirement is met, and can safely and efficiently run again.The present invention is applied to primary frequency modulation analysis field.
Description
Technical field
Direct current cooker, steam turbine, electric network coordination control method the present invention relates to be used for primary frequency modulation analysis.
Background technology
Due to overcritical and extra-supercritical unit be superior in economy, environmental protection, efficiency and capacity each side it is subcritical
Unit, overcritical and extra-supercritical unit has turned into the Developing mainstream of following construction of fire and electricity.Overcritical and extra-supercritical unit is super
The characteristics of high temperature and super-pressure, causes it must to use direct current cooker, and direct current cooker is present, and accumulation of heat is small, sensitive to disturbance, machine stove
Between the problems such as couple serious.As the intermittent energy sources such as wind-powered electricity generation are grid-connected, power system frequency modulation increase in demand is overcritical and super
Criticality benchmark power is frequently changed, and direct current cooker main steam pressure will be caused to fluctuate widely, and increases the wind of direct current cooker operation
Danger.
From in terms of operation of power networks angle, what is directly interconnected with power network is Steam Turbine, so the emphasis that traditional machine net is coordinated
It is generating set and less consideration boiler, ignores the safety and dynamic characteristic of boiler.Traditional boiler-turbine coordinated control is referred to
When external load changes, power change commands are issued into boiler and steam turbine control system simultaneously, to control valve opening and pot
Stove synchronizes adjustment, coordinates control.The core concept of its control is to improve the response speed that unit changes to network load, and
Do not take into full account that the boiler pressure that Large Copacity high pressure high temperature turbosets are caused when load fluctuation is responded fluctuates.In direct current cooker and steamer
Machine is coupled under the small background of serious, direct current cooker accumulation of heat, and the safety problem of direct current cooker needs to pay attention to again.
Analyzed more than, if not considering the characteristic of boiler in primary frequency modulation control, it will give Large Copacity senior staff officer
Number fired power generating unit is participated in primary frequency modulation and brings high resistance, is unfavorable for that power system safety and stability runs.
The content of the invention
The present invention is, in order to solve the characteristic that prior art does not account for boiler, to be participated in Large Copacity high parameter fired power generating unit
Primary frequency modulation brings high resistance, is unfavorable for the problem of power system safety and stability operation, and the one kind for proposing is used to once adjust
The direct current cooker of frequency analysis, steam turbine, electric network coordination control method.
A kind of direct current cooker for primary frequency modulation analysis, steam turbine, electric network coordination control method are realized according to the following steps：
Step one：Direct current cooker energy state analysis is carried out, direct current cooker energy state is determined；
Step 2：Power grid energy state analysis is carried out, power grid energy state is determined；
Step 3：The power grid energy state that the direct current cooker energy state and step 2 determined according to step one determine, really
Surely source energy compatibility control strategy is netted.
Invention effect：
The characteristics of in view of overcritical and extra-supercritical unit, the present invention devises a kind of new control method：Boiler,
Steam turbine, power network regard a control object as, consider the security and stability problem of three.Meeting power grid security fortune
On the premise of row is required, fired power generating unit is fully participated in frequency modulation, can safely and efficiently run again, reach power network, power supply double
Win.
According to simulation result, power grid energy balance, it is micro- it is high, relatively low, very under low state, the inventive method is to mains frequency
Extraordinary influence is produced, and the control method make use of the dynamic power of boiler, make supercritical once-through boiler main steam pressure
Fluctuating range significantly reduces.
(1) direct current cooker, steam turbine, electric network coordination control method can improve the life-span of direct current cooker.Because doing things by following nature
Chirping strategies make boiler energy using more rationally, boiler in operation pressure, temperature fluctuation reduce, the water-cooled of direct current cooker
Wall, the life consumption of superheater are reduced, therefore extend the service life of boiler.Using direct current cooker, steam turbine, electric network coordination control
Method processed, the life 7.19% of water-cooling wall, the life 3.85% of superheater.
(2) direct current cooker, steam turbine, electric network coordination control method increased power system fm capacity.Comprising difference
On the basis of the power system frequency modulation model of type unit, supercritical unit accounted for 20%, other kinds unit and accounts for 20%, with 1 day
Actual load is input：In the climbing period, CPS1 is lifted to 2.91 from 2.77；In the steady period, CPS1 from 2.86 liftings to
2.96；When being calculated with whole day data, CPS1 is lifted to 2.86 from 2.78.Control performance has preferably lifting.Supercritical unit
SCPS1 from 1.74 liftings to 2.09, beneficial is examined to unit.
(3) direct current cooker, steam turbine, electric network coordination control method will not produce big influence to trend.Line Flow becomes
Change amount is related and relevant with the topological structure of node to head and end node injecting power variable quantity.Under perunit value, first and last node
The difference of injecting power increment is substantially suitable with Line Flow variable quantity.During conservative estimation, direct current cooker, steam turbine, power network association
To the power variable within 2% when, Line Flow variable quantity is also within 2% for control method.
Brief description of the drawings
Fig. 1 is corrected output injunctive mood principle schematic；
Fig. 2 is amendment primary frequency modulation diversity factor figure；
Fig. 3 is power network 1000s frequency data figures under varying duty；
Fig. 4 be power grid energy poised state under direct current cooker, steam turbine, electric network coordination to power and the tune of main steam pressure
Section design sketch；
Fig. 5 is for power grid energy compared with direct current cooker, steam turbine, electric network coordination under low state to power and the tune of main steam pressure
Section design sketch；
Fig. 6 be power grid energy very low state under direct current cooker, steam turbine, electric network coordination to power and the tune of main steam pressure
Section design sketch.
Specific embodiment
Specific embodiment one：A kind of direct current cooker, steam turbine, electric network coordination control method for primary frequency modulation analysis
Comprise the following steps：
Step one：Direct current cooker energy state analysis is carried out, direct current cooker energy state is determined；
Step 2：Power grid energy state analysis is carried out, power grid energy state is determined；
Step 3：The power grid energy state that the direct current cooker energy state and step 2 determined according to step one determine, really
Surely source energy compatibility control strategy is netted.
Specific embodiment two：Present embodiment from unlike specific embodiment one：Control is determined in the step one
The input variable and output variable of device processed are specially：
Main steam pressure and energy into preferable linear relationship, can react the height of boiler dynamic power with main steam pressure
It is low.In actual motion, only it is to be understood that conversion coefficient therebetween is the boiler energy that may know that each moment.Conversion coefficient exists
The debugging stage of direct current cooker disposably obtains by relevant position install sensor.
The present invention defines boiler energy state according to the main steam pressure height of direct current cooker, as shown in table 1.Primary frequency modulation
The upper limit of regulated quantity is generally 3.5% rated power, therefore defines Δ PtMIt is subject in time corresponding to 3.5% rated power
Main steam pressure it is poor.
The direct current cooker energy state of table 1
As -0.1MPa≤Δ PtMDuring≤0.1MPa, boiler energy is in a basic balance, and it is flat to define direct current cooker energy state
Weighing apparatus, the Δ PtMThe main steam pressure that direct current cooker is subject in time corresponding to 3.5% rated power is poor；
As Δ PtM<During -0.1MPa, boiler energy is relatively low, and it is shortage to define direct current cooker energy state；
As Δ PtM>During 0.1MPa, boiler energy is superfluous, and it is surplus to define direct current cooker energy state.
Other steps and parameter are identical with specific embodiment one.
Specific embodiment three：Present embodiment from unlike specific embodiment one or two：In the step 2 really
Determine power grid energy state to be specially：
The present invention determines power grid energy state with mains frequency size.With reference to actual electric network data, from level time minute
The analysis that yardstick and statistics angle are carried out to frequency, mains frequency fluctuation has with draw a conclusion (as shown in table 2)：
1) in more time (33.2%), Δ f falls in the range of [- 0.01,0.01], and power grid energy is defined as " flat
Weighing apparatus ".
2) within more than half times (51.5%), Δ f is beyond " balance " scope but without departing from Regulation dead-band, that is, fall ±
In [0.01,0.0333], now power grid energy is " micro- high " or " micro- low " for definition.According to statistics, Δ f fall [-
0.0333 ,+0.0333] interval in be in the great majority (84.7%).
3) there is part-time (11.6%), Δ f exceeds dead band, fall in [0.033,0.046] is interval, define now power network
Energy state is " higher " or " relatively low ".If Δ f exceeds dead band, the duration 1min-2min outside dead band is, it is necessary to machine
Group change is exerted oneself, and makes frequency retrieval.According to statistics, Δ f falling to accounted for absolutely mostly in [- 0.0466 ,+0.0466] interval interior time
Number (96.3%).
4) a small number of times (3.5%), Δ f falls in ± [0.0466,0.0699] is interval, defines now power grid energy state
It is " very high " or " very low ".Now power grid energy is uneven more serious, typically occurs under varying duty by a small margin, it is necessary to machine
Group increases strength of adjustment, recovers mains frequency.According to statistics, Δ f falling to accounted in [- 0.0699 ,+0.0699] interval interior time
Most (99.8%).
5) only a few time (0.2%), Δ f falls in ± [0.0699,0.1] is interval, defines now power grid energy state
It is " extremely low " or " high ".Now load variations amplitude is big.
The power grid energy state of table 2
In regional power grid CPS standards, the physical significance of B is the power shortage corresponding to 0.1Hz frequency differences, in other words, according to
According to the size of frequency difference, the current power shortage of power network can be calculated.Part power network work(frequency modulation difference coefficient B determines as follows：
1.5% annual budgetary maximum load/0.1Hz.Net traffic department of each province has difference according to actual conditions numerical value, but must not be less than
1% annual budgetary maximum load/0.1Hz.B=1.5%P of the present inventionyM/ 0.1Hz, wherein PyMIt is annual budgetary maximum load
(MW).When taking no account of dominant eigenvalues deviation, then one's respective area power headroom Δ Ps=(10B) Δ f, frequency modulation dynamics should be with system
Based on power headroom.Meter and during dominant eigenvalues surplus, one's respective area power headroom Δ Ps=ACE.
According to above-mentioned analysis, power grid energy is divided into nine kinds of states, respectively balance, it is micro- it is low, it is micro- it is high, relatively low, higher,
It is very low, very high, extremely low, high, as shown.
Other steps and parameter are identical with specific embodiment one or two.
Specific embodiment four：Unlike one of present embodiment and specific embodiment one to three：The step 3
It is middle determine net source energy compatibility control strategy detailed process be：
The coordination control strategy is based on following two methods：
(1) corrected output injunctive mood
Corrected output injunctive mood principle is as shown in Figure 1.It is functions combination steam turbine model outside dotted line, by a forward channel
Constituted with power, two feedback channels of frequency.Forward channel includes PI integrations, executing agency, vapor volume, rotor inertia four
Link, design parameter is as shown in table 3.
It is new control method in dotted line, equivalent in original power set-point RtOn increased a correction, should
Correction is given by H (s), and the specific values of H (s) are determined by the height of direct current cooker energy.PtIt is main steam pressure actual value, Pts
It is main steam pressure rated value, according to different power networks, direct current cooker state, the value of C is different, but is constant；
Steam turbine model parameter is as shown in table 3.
(2) primary frequency modulation diversity factor method is corrected
The given method of corrected output can realize that boiler energy is high, and many generatings, energy generate electricity less at least.But in reality
In operation, it may appear that the state that boiler energy is high and power grid energy is high, now overcritical and extra-supercritical unit will still lighten the burden
Lotus to meet the primary frequency modulation demand of power network, but for the angle of boiler safety, it is desirable to undertake primary frequency modulation less under this operating mode
Task, makes boiler energy tend to be steady.The regulation task being undertaken by the relatively low unit of main steam pressure in system more.
The steam turbine model parameter of table 3
The thought of dynamic primary frequency modulation is used for reference, the reverse regulating effect of decrease is reached by changing the gain of backfeed loop,
Switch the control passage of primary frequency modulation so that run when in these cases, overcritical and extra-supercritical unit frequency modulation is made
With decrease.As shown in Figure 2.Wherein primary frequency modulation control passage 1 is original primary frequency modulation control passage, i.e.,Primary frequency modulation
Control passage 2 is the passage designed to weaken adjustment effect, i.e.,δ2＞ δ1, that is, put into primary frequency modulation control passage 2
When, fm role weakens.
Increase a primary frequency modulation control passage, i.e., former primary frequency modulation control passage is primary frequency modulation control passage 1, one
Secondary frequency modulation diversity factor is δ1；Increased primary frequency modulation control passage is primary frequency modulation control passage 2, and its primary frequency modulation diversity factor is
δ2；Wherein δ2＞ δ1, that is, when putting into primary frequency modulation control passage 2, fm role weakens；
In summary power grid energy analysis and direct current cooker energy spectrometer, from terms of grid side, for the nine kinds of energy for proposing
Amount state, overcritical and extra-supercritical unit this with corresponding control strategy keep mains frequency stabilization.From in terms of mains side, for
Three kinds of energy state of the direct current cooker that table 1 is proposed, take the control strategy for doing things by following nature for power grid frequency modulation is contributed as far as possible, have
Body ground, when boiler energy is superfluous, undertakes system Δ f more<The regulation of 0 period, it is appropriate to mitigate Δ f>The regulation of 0 period, otherwise
Similarly, the purpose of net source doulbe-sides' victory is reached with this.
With reference to both the above method, overcritical under different power networks, direct current cooker energy state and extra-supercritical unit control
Strategy processed is：
1) when power grid energy is balanced：Overcritical and extra-supercritical unit generated output reaches balance with load, it is not necessary to adjust
It is whole, but direct current cooker is because of coal-fired hot-restriking die, part of generating units energy surplus, part of generating units shortage of energy, in order that its energy is extensive
It is multiple, and system capacity balancing band is not influenceed, it is allowed to the unit Spontaneous release energy of energy surplus, the unit of shortage of energy is certainly
Right accumulation energy, it is allowed to the unit Spontaneous release energy of energy surplus, the unit nature accumulation energy of shortage of energy, Spontaneous release
With natural product for a long time：C=0.5, (without departing from Regulation dead-band, primary frequency modulation control passage 1 is or not input primary frequency modulation control passage 1
Effect), keep the primary electricity of unit constant；The unit commitment primary frequency modulation control passage 1, C=0 of energy balance；
2) when mains frequency is micro- high：Because not yet exceeding Regulation dead-band, unit unnecessary regulation in principle.Partial DC boiler
Because shortage of energy, generating can be suitably reduced, not only improve frequency retrieval, again recover boiler main steam pressure, to boiler
Life-span produces wholesome effect, and the control strategy of the direct current cooker of shortage of energy is acceleration accumulation, C=1 during acceleration accumulation, input
Primary frequency modulation control passage 1 (without departing from Regulation dead-band, primary frequency modulation control passage 1 is not acted on)；Accelerated release in vitro is as the same.Energy mistake
Surplus unit and the unit commitment primary frequency modulation control passage 1, C=0 of energy balance；
3) when mains frequency is micro- low：The control strategy of the direct current cooker of energy surplus is accelerated release in vitro, during accelerated release in vitro：C
=1, input primary frequency modulation control passage 1；The unit of shortage of energy and the unit commitment primary frequency modulation control passage of energy balance
1, C=0；
4) when power grid energy is higher：Frequency difference exceeds Regulation dead-band, but grid power excess quantity is no more than 0.69%PyM, unit
Primary frequency modulation should act to reduce generated energy.The shortage of Partial DC boiler energy, can be more provide " negative energy " for power network,
In addition to normal primary frequency modulation, generated energy can be suitably reduced according to the size of boiler main steam pressure, both for primary frequency modulation is more
Contribute, and beneficial to the recovery of main steam pressure, be defined as " accelerating accumulation+primary frequency modulation ", now C=1, puts into primary frequency modulation
Control passage 1.Also Partial DC boiler energy balances, it is " primary frequency modulation " to define control strategy, now：Input primary frequency modulation
Control passage 1, C=0.Also Partial DC boiler energy is superfluous, conflicts with power grid energy.Grid power excess quantity is not when therefore
More than 0.69%PyM, suitably weakening primary frequency modulation adjustment effect will not be negatively affected to power grid frequency modulation, and to boiler energy
The recovery of state is beneficial, and it is " primary frequency modulation suitably weakens " to define control strategy, now：C=0, input primary frequency modulation control is logical
Road 2, unit primary frequency modulation diversity factor is changed into δ2, i.e. adjustment effect is original half.Power grid energy is relatively low similarly.
To accelerate accumulation and primary frequency modulation, now C=1, puts into and once adjusts the control strategy of the direct current cooker of shortage of energy
Frequency control passage 1；The control strategy of the direct current cooker of energy surplus suitably weakens for primary frequency modulation, now：C=0, input is once
Frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；The unit commitment of energy balance is once
Frequency modulation control passage 1, C=0；
5) when power grid energy is relatively low：The control strategy of the direct current cooker of energy surplus be accelerated release in vitro and primary frequency modulation, this
When C=1, input primary frequency modulation control passage 1；The control strategy of the direct current cooker of shortage of energy suitably weakens for primary frequency modulation,
Now：C=0, input primary frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；Energy
The unit commitment primary frequency modulation control passage 1, C=0 of balance；
6) when power grid energy is very high：Now there is more serious imbalance in grid power, and power surplus amount is no more than
1.05%PyM.The control strategy of the direct current cooker of shortage of energy be Rapid Accumulation and primary frequency modulation, now：C=2, input is once
Frequency modulation control passage 1；The control strategy of the direct current cooker of energy surplus suitably weakens for primary frequency modulation, now：C=0, input one
Secondary frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；The unit commitment one of energy balance
Secondary frequency modulation control passage 1, C=0；Because being typically arranged with a certain proportion of hydraulic turbine, the unit machine of dum boiler type in system
Group, hydroenergy storage station, the response speed of such unit, heat storage capacity have preferably response, sub-fraction to system varying duty
Overcritical and extra-supercritical unit weakens primary frequency modulation will not be had adverse effect on to system frequency modulation.Power grid energy very it is low similarly
7) when power grid energy is very low：The control strategy of the direct current cooker of energy surplus be quick release and primary frequency modulation, this
When：C=2, input primary frequency modulation control passage 1；The control strategy of the direct current cooker of shortage of energy suitably weakens for primary frequency modulation,
Now：C=0, input primary frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；Energy
The unit commitment primary frequency modulation control passage 1, C=0 of balance；
8) when power grid energy is high：Now there is larger disturbance, it is ensured that power network frequency stabilization within a few minutes after disturbance
It is top priority.All unit commitment primary frequency modulations, that is, put into primary frequency modulation control passage 1.The direct current cooker of shortage of energy
Control strategy is Rapid Accumulation and primary frequency modulation, i.e. C=2, input primary frequency modulation control passage 1；The unit and energy of energy balance
Measure superfluous unit commitment primary frequency modulation control passage 1, C=0；
9) when power grid energy is extremely low：The control strategy of the direct current cooker of energy surplus is quick release and primary frequency modulation, i.e. C
=2, input primary frequency modulation control passage 1；The unit of energy balance and the unit commitment primary frequency modulation control passage of shortage of energy
1, C=0.
Under each net, source energy state, overcritical and ultra supercritical monoblock control strategy is as shown in table 4, specific to grasp
Make as shown in table 5.
Unit allocation strategy under each net of table 4, source energy state
Unit allocation strategy concrete operations under each net of table 5, source energy state
Other steps and parameter are identical with one of specific embodiment one to three.
Embodiment one：
In order to verify the validity of proposed stove-machine-net control method for coordinating, according to certain power network in larger load change
Under 1000s frequency data, checking stove-machine-net control method for coordinating is relative to former control method to boiler, of both power network
Influence.Specifically, power grid energy balance, it is micro- it is high, relatively low, very under low state, contrast stove-machine-net coordinate control put into it is forward and backward
Main steam pressure and generated output.Specified main steam pressure is 24.2MPa, and the reference value of frequency difference is 50Hz, δ2=2 δ1.The time
Band frequency is as shown in Figure 3.
In order to illustrate control action of the control method under different power grid energy states, unit energy state, this implementation
The electric network state that example is chosen has：Energy balance (80s-130s), power grid energy micro- (130s-160s) high, power grid energy are relatively low
(320s-360s), power grid energy are very low (200s-240s).Respectively contrast stove-machine-net control method for coordinating with it is traditional once
Under frequency modulation control method, the active power and main steam pressure of unit.
When power grid energy is balanced.According to control strategy, the supercritical unit of energy surplus can be with Spontaneous release energy, energy
The supercritical thermal power unit for measuring shortage can natural accumulation energy.The unit because of shortage of energy, natural accumulation energy, main steam pressure
Fluctuation reduces 0.1MPa, and recovery effects are good；The more former control mode of generated energy reduces about 0.004p.u., in acceptable scope
It is interior.As shown in 80s-130s curves in Fig. 4.When power grid energy is micro- high.According to control strategy, the unit of shortage of energy accelerates product
Tired energy, other units keep primary electricity.The unit shortage of energy, therefore accelerate accumulation energy, main steam pressure recovers preferable,
The more former control mode of generated energy reduces about 0.008p.u., also within the acceptable range.Such as 130s-160s curves institute in Fig. 4
Show.
When power grid energy is relatively low.According to control strategy, the unit of energy surplus can accelerate to release in addition to normal primary frequency modulation
Exoergic amount.The unit energy surplus, therefore accelerated release in vitro energy, main steam pressure fluctuation reduce 0.1MPa, the more former control of generated energy
Mode increase about 0.011p.u..As shown in 320s-360s curves in Fig. 5.
When power grid energy is very low.According to control strategy, the unit of energy surplus, can quick release except normal primary frequency modulation
Energy.The unit energy surplus, therefore quick release, main steam pressure fluctuation reduce 0.2MPa, and the more former control mode of generated energy increases
Plus about 0.020p.u..As shown in 200s-240s curves in Fig. 6.
Summary simulation result, power grid energy balance, it is micro- it is high, relatively low, very under low state, stove-machine-net coordination controlling party
Method produces extraordinary influence to mains frequency, and the control method make use of the dynamic power of boiler, make supercritical DC
Boiler main steam pressure fluctuating range significantly reduces.
Claims (4)
1. it is a kind of for primary frequency modulation analysis direct current cooker, steam turbine, electric network coordination control method, it is characterised in that it is described
Direct current cooker, steam turbine for primary frequency modulation analysis, electric network coordination control method are comprised the following steps：
Step one：Direct current cooker energy state analysis is carried out, direct current cooker energy state is determined；
Step 2：Power grid energy state analysis is carried out, power grid energy state is determined；
Step 3：The power grid energy state that the direct current cooker energy state and step 2 determined according to step one determine, determines net
Source energy compatibility control strategy.
2. it is according to claim 1 it is a kind of for primary frequency modulation analysis direct current cooker, steam turbine, electric network coordination controlling party
Method, it is characterised in that determine that the input variable and output variable of controller are specially in the step one：
As -0.1MPa≤△ PtMDuring≤0.1MPa, it is balance, the △ P to define direct current cooker energy statetMFor 3.5% specified
The main steam pressure that direct current cooker is subject in time corresponding to power is poor；
As △ PtM<During -0.1MPa, it is shortage to define direct current cooker energy state；
As △ PtM>During 0.1MPa, it is surplus to define direct current cooker energy state.
3. primary frequency modulation according to claim 1 and 2 is analyzed direct current cooker, steam turbine, electric network coordination control method, its
It is characterised by, determines that power grid energy state is specially in the step 2：
As -0.01≤△ f ﹤ 0.01, power grid energy is defined as balance, and the △ f are mains frequency and specified mains frequency
Difference；
As -0.033≤△ f ﹤ -0.01, power grid energy is defined as micro- low；
As 0.01≤△ f ﹤ 0.033, power grid energy is defined as micro- high；
As -0.046≤△ f ﹤ -0.033, power grid energy is defined as relatively low；
As 0.033≤△ f ﹤ 0.046, power grid energy is defined as higher；
As -0.0699≤△ f ﹤ -0.046, power grid energy is defined as very low；
As 0.046≤△ f ﹤ 0.0699, power grid energy is defined as very high；
As -0.1≤△ f ﹤ -0.0699, power grid energy is defined as extremely low；
When 0.0699≤△ f≤0.1, power grid energy is defined as high.
4. primary frequency modulation according to claim 3 is analyzed direct current cooker, steam turbine, electric network coordination control method, it is special
Levy and be, the detailed process that net source energy compatibility control strategy is determined in the step 3 is：
The coordination control strategy is based on following two methods：
(1) corrected output injunctive mood
In steam turbine power set-point RtOne correction of upper increase, the correction is given by H (s), PtIt is main steam pressure reality
Value, PtsIt is main steam pressure rated value, C is constant；
(2) primary frequency modulation diversity factor method is corrected
Increase a primary frequency modulation control passage, i.e., former primary frequency modulation control passage is primary frequency modulation control passage 1, and it is once adjusted
Frequency diversity factor is δ1；Increased primary frequency modulation control passage is primary frequency modulation control passage 2, and its primary frequency modulation diversity factor is δ2；Its
Middle δ2＞ δ1, that is, when putting into primary frequency modulation control passage 2, fm role weakens；
With reference to both the above method, overcritical under different power networks, direct current cooker energy state and extra-supercritical unit control plan
Slightly：
1) when power grid energy is balanced：Overcritical and extra-supercritical unit generated output reaches balance with load, it is not necessary to adjust, and permits
Perhaps the unit Spontaneous release energy of energy surplus, the unit nature accumulation energy of shortage of energy, Spontaneous release and natural product are for a long time：
C=0.5, input primary frequency modulation control passage 1 keeps the primary electricity of unit constant；The unit commitment primary frequency modulation of energy balance
Control passage 1, C=0；
2) when mains frequency is micro- high：The control strategy of the direct current cooker of shortage of energy is accumulated for acceleration, when accelerating accumulation：C=1,
Input primary frequency modulation control passage 1；The unit of energy surplus and the unit commitment primary frequency modulation control passage 1, C=of energy balance
0；
3) when mains frequency is micro- low：The control strategy of the direct current cooker of energy surplus is accelerated release in vitro, during accelerated release in vitro：C=1,
Input primary frequency modulation control passage 1；The unit of shortage of energy and the unit commitment primary frequency modulation control passage 1, C=of energy balance
0；
4) when power grid energy is higher：The control strategy of the direct current cooker of shortage of energy is accumulated and primary frequency modulation for acceleration, now C=
1, input primary frequency modulation control passage 1；The control strategy of the direct current cooker of energy surplus suitably weakens for primary frequency modulation, now：C
=0, input primary frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；Energy balance
Unit commitment primary frequency modulation control passage 1, C=0；
5) when power grid energy is relatively low：The control strategy of the direct current cooker of energy surplus is accelerated release in vitro and primary frequency modulation, now C=
1, input primary frequency modulation control passage 1；The control strategy of the direct current cooker of shortage of energy suitably weakens for primary frequency modulation, now：C
=0, input primary frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；Energy balance
Unit commitment primary frequency modulation control passage 1, C=0；
6) when power grid energy is very high：The control strategy of the direct current cooker of shortage of energy be Rapid Accumulation and primary frequency modulation, now：C
=2, input primary frequency modulation control passage 1；The control strategy of the direct current cooker of energy surplus suitably weakens for primary frequency modulation, this
When：C=0, input primary frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；Energy is put down
The unit commitment primary frequency modulation control passage 1, C=0 of weighing apparatus；
7) when power grid energy is very low：The control strategy of the direct current cooker of energy surplus be quick release and primary frequency modulation, now：C
=2, input primary frequency modulation control passage 1；The control strategy of the direct current cooker of shortage of energy suitably weakens for primary frequency modulation, this
When：C=0, input primary frequency modulation control passage 2, unit primary frequency modulation diversity factor is changed into δ2, i.e., adjustment effect weaken；Energy is put down
The unit commitment primary frequency modulation control passage 1, C=0 of weighing apparatus；
8) when power grid energy is high：The control strategy of the direct current cooker of shortage of energy be Rapid Accumulation and primary frequency modulation, i.e. C=2,
Input primary frequency modulation control passage 1；The unit of energy balance and the unit commitment primary frequency modulation control passage 1, C=of energy surplus
0；
9) when power grid energy is extremely low：The control strategy of the direct current cooker of energy surplus be quick release and primary frequency modulation, i.e. C=2,
Input primary frequency modulation control passage 1；The unit of energy balance and the unit commitment primary frequency modulation control passage 1, C=of shortage of energy
0。
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107370156A (en) * | 2017-08-24 | 2017-11-21 | 赫普科技发展（北京）有限公司 | A kind of power grid frequency modulation system based on electrode boiler |
| CN110824355A (en) * | 2018-08-10 | 2020-02-21 | 中国石油化工股份有限公司 | Steam extraction heat supply unit simulation system |
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| CN110242370A (en) * | 2019-05-28 | 2019-09-17 | 西安交通大学 | The control method and control system model of primary frequency regulation of power network are participated in when a kind of overcritical Reheat-type unit sliding pressure operation |
| CN110242370B (en) * | 2019-05-28 | 2020-10-27 | 西安交通大学 | Control method and control system model for participating in primary frequency modulation of power grid during sliding pressure operation of supercritical intermediate reheating unit |
| CN114142489A (en) * | 2021-11-17 | 2022-03-04 | 山东大学 | Wind-fire cooperative frequency modulation method for high-proportion new energy power grid considering heat storage dynamic state |
| CN114142489B (en) * | 2021-11-17 | 2023-09-12 | 山东大学 | Wind-fire cooperative frequency modulation method for high-proportion new energy power grid considering heat storage dynamics |
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