CN106532739B - Wind turbines frequency-division section participates in electric system primary frequency modulation method - Google Patents
Wind turbines frequency-division section participates in electric system primary frequency modulation method Download PDFInfo
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Abstract
Wind turbines frequency-division section participates in electric system primary frequency modulation method, is related to Wind turbines and participates in primary frequency regulation of power network technology.Purpose is in order to which wind field economy is contradicted with frequency regulation capacity when solving the problems, such as that Wind turbines participate in primary frequency modulation.The present invention is first respectively separated the high-frequency signal in power grid and low frequency signal using high-pass filter and low-pass filter, then inertia control link and droop control link are introduced in Wind turbines, operational mode is set according to the landscape condition of abandoning that wind power plant is current, the operational mode is optimal power tracing mode or suboptimum power tracking pattern, the electromagnetic power reference value under two kinds of operational modes is finally calculated respectively, electromagnetic power reference value is acted on into rotor current transformer, completes the primary frequency modulation process that Wind turbines frequency-division section participates in electric system.Method of the present invention realizes Wind turbines while output is not lost, and the primary frequency modulation of electric system is participated in the maximum extent, suitable for the frequency modulation of Wind turbines.
Description
Technical field
The present invention relates to Wind turbines to participate in primary frequency regulation of power network technology.
Background technology
Wind-electricity integration operation is the effective form of large-scale development wind energy, but with the continuous promotion of installed capacity of wind-driven power,
It is original to be changed in the form of the power supply architecture that thermoelectricity, water power are leading, after wind-powered electricity generation permeability substantially increases, wind-powered electricity generation work(
The fluctuation of rate also brings the frequency stabilization of power grid and active balance certain impact, if still only handling Wind turbines
It is added in network re-active power equilibrium relation into negative load, huge frequency modulation pressure can be brought to fired power generating unit, is not only made
Frequent start-stop into fired power generating unit influences its service life, also largely limits the further development of wind-powered electricity generation.
The control strategy of the primary frequency regulation of power network of Wind turbines participation at present is broadly divided into three kinds：Award setting, inertia control
System, Control of decreasing load.Award setting is by controlling propeller pitch angle to change power coefficient to change grid-connected power, due to pitch
Angle is adjusted to mechanical action, and frequency modulation speed is slow；Inertia control participates in frequency modulation using rotor moment of inertia, in mains frequency wave
It is absorbed when dynamic or release rotor kinetic energy is converted into electromagnetic power, though frequency modulation speed has compared with its fast frequency regulation capacity of award setting
Limit；Control of decreasing load makes running of wind generating set on suboptimum power tracking curve, and primary frequency modulation is participated in using the active surplus reserved,
Its frequency regulation capacity is big, but Wind turbines longtime running has seriously affected the economy of wind power plant in off-load state.
Invention content
The purpose of the present invention is to solve wind field economy during Wind turbines participation primary frequency modulation and frequency regulation capacity phase lances
The problem of shield, it is proposed that consider that the Wind turbines frequency-division section of wind power plant economy participates in electric system primary frequency modulation method.
Wind turbines frequency-division section of the present invention participates in electric system primary frequency modulation method and includes the following steps：
Step 1: use high-pass filterVibration frequency in power grid is higher thanFrequency departure Signal separator
Out, △ f are denoted asHi；Use low-pass filterVibration frequency in power grid is less thanFrequency departure Signal separator go out
Come, be denoted as △ fLi, wherein HiFor Wind turbines rotor inertia time constant, subscript i represents i-th Wind turbines, and s represents to pass
Delivery function；
Step 2: inertia control link and droop control link, the inertia control link packet are introduced in Wind turbines
Virtual inertia link is included, which is made of differentiation element and proportional component two parts, wherein the ratio of proportional component
Example coefficient is set as 2Hi；The sagging coefficients R of droop control linkiIt is determined by formula (1)；
Wherein, permitted maximum frequency deviation when △ f are power grid normal operation, unit p.u.；Pe1iFor Wind turbines
Optimal power under current wind speed, unit p.u.；Pe2iOff-load for Wind turbines runs power, unit p.u.；
Step 3: operational mode is set according to the current landscape condition of abandoning of wind power plant：
If the optimal power under i-th current wind speed of Wind turbines in wind power plant is Pe1i, there are n platform units in wind power plant,
Wind power plant currently limits output as Pout, then what wind power plant was current abandons air quantity P△As shown in formula (2)：
Work as P△When≤0, all units are operated under optimal power tracing mode in wind power plant, are called operating mode
One；
Work as P△>When 0, all equal off-loads of unit are operated under suboptimum power tracking pattern in wind power plant, are called Working mould
Formula two；
Step 4: when Wind turbines are in operating mode for the moment, electromagnetic power reference value PrefiAs shown in formula (8)：
Prefi=PMPPTi-△PHi (8)
Wherein, PMPPTiFor optimal power aircraft pursuit course；
When Wind turbines are in operating mode two, electromagnetic power reference value PrefiAs shown in formula (10)；
Prefi=Pdeli-(△PHi+△PLi) (10)
Electromagnetic power adjustment signal △ PHiAcquisition methods be：The vibration frequency isolated in step 1 is higher than
Signal △ fHi, the virtual inertia link that sets in input step two obtains electromagnetic power adjustment signal △ PHi, such as formula (6)
It is shown：
Electromagnetic power adjustment signal △ PLiPreparation method be：The vibration frequency isolated in step 1 is less than
Signal △ fLi, droop control link is inputted, obtains electromagnetic power adjustment signal △ PLi, as shown in formula (7)：
PdeliFor suboptimum power tracking reference value；
Step 5: by electromagnetic power reference value PrefiRotor current transformer is acted on, completes primary frequency modulation process.
The present invention abandons air quantity and determines unit operation in optimal power tracing mode or suboptimum according to wind power plant is current
Power tracking pattern calculates the electromagnetic power reference value P under two kinds of different modes respectivelyrefi, by electromagnetic power reference value PrefiMake
For rotor current transformer, primary frequency modulation is realized.This method makes wind by way of by the processing of mains frequency deviation signal frequency-division section
Motor group becomes component response under optimal power tracing mode to fast in mains frequency deviation signal, in suboptimum power tracking mould
The fast component that becomes in mains frequency deviation signal with slow component is responded under formula, Wind turbines is made to ensure what itself contributed
Under the premise of participate in the primary frequency modulation of power grid to the maximum extent, improve the frequency quality of power grid.
Description of the drawings
Fig. 1 participates in electric system primary frequency modulation method the general frame for Wind turbines frequency-division section of the present invention；
Fig. 2 participates in primary frequency modulation control block diagram for Wind turbines frequency-division section；
Fig. 3 is running of wind generating set schematic diagram；
Fig. 4 is suboptimum power tracking curve, v in figure1i、v2iAnd v3iRepresent that power-rotating speed of wind turbine under different wind speed is bent
Line；
Fig. 5 is reserve Control of decreasing load schematic diagram, curve 1,2,3 and 4 represents the power of wind turbine under different wind speed-turn
Fast curve, the wherein wind speed of curve 1 are 11m/s, and the wind speed of curve 2 is 9m/s, and the wind speed of curve 3 is 7m/s, the wind speed of curve 4
For 5m/s；
Fig. 6 is the △ f in embodiment twoHiSignal；
Fig. 7 is wind speed situation of change in certain sound of the wind 200s；
Fig. 8 is the optimal output of wind-powered electricity generation sound；
Fig. 9 is the △ P in embodiment twoHiSignal；
Figure 10 is the system frequency deviation surveyed under wind speed；
Figure 11 is that the wind energy conversion system surveyed under wind speed is contributed；
Figure 12 is the wind energy conversion system average output surveyed under wind speed；
Figure 13 is the △ f in embodiment threeHiWith △ fLiSignal；
Figure 14 is the △ P in embodiment threeHiWith △ PLiSignal；
Figure 15 is the △ P in embodiment threeiSignal；
Figure 16 is wind speed when being 105m/s, and 2% wind turbine of anticlimax load participates in system frequency deviation before and after frequency modulation；
Figure 17 is wind speed when being 105m/s, and 1% wind turbine of anticlimax load participates in system frequency deviation before and after frequency modulation；
Figure 18 is wind speed when being 105m/s, and 1% wind turbine of sudden increase in load participates in system frequency deviation before and after frequency modulation；
Figure 19 is wind speed when being 105m/s, and 2% wind turbine of sudden increase in load participates in system frequency deviation before and after frequency modulation.
Specific embodiment
Specific embodiment one：Wind turbines frequency-division section described in present embodiment participates in electric system primary frequency modulation method
Include the following steps：
Step 1：Design the high-pass filter as shown in solid box on the left of Fig. 2Vibration frequency in power grid is high
InFrequency departure Signal separator come out, be denoted as △ fHi；Design the low-pass filter as shown in Fig. 2 left-hand broken line framesVibration frequency in power grid is less thanFrequency departure Signal separator come out, be denoted as △ fLi；Wherein HiFor wind turbine
Group rotor inertia time constant, subscript i represent i-th Wind turbines, and s represents transmission function；
Step 2：Inertia control link and droop control link, the inertia control link packet are introduced in Wind turbines
Virtual inertia link is included, which is made of differentiation element and proportional component two parts, wherein the ratio of proportional component
Example coefficient is set as 2Hi；Droop control Absent measures block diagram is as shown in chain-dotted line part long in Fig. 2, sagging coefficients RiBy formula
(1) it determines.
Wherein, permitted maximum frequency deviation when △ f are power grid normal operation, unit p.u.；Pe1iFor Wind turbines
Optimal power under current wind speed, unit p.u.；Pe2iOff-load for Wind turbines runs power, unit p.u..Work as wind
R when the non-off-load of motor group is runi→ ∞ disconnects droop control channel.Pe2iThe current air quantity of abandoning of value and wind power plant have
It closes, the operational mode differentiation of setting method and Wind turbines illustrates in step 3；
Step 3：Operational mode is set according to the landscape condition of abandoning that wind power plant is current.If i-th Wind turbines in wind power plant
Optimal power under current wind speed is Pe1i, have n platform units in wind power plant, wind power plant currently limits output as Pout, then wind power plant
Current abandons air quantity P△As shown in formula (2).
Work as P△When≤0, all units are operated under optimal power tracing mode in wind power plant, are called operating mode
One.Under this operating mode, Wind turbines are run always according to optimal power aircraft pursuit course.The operation logic of Wind turbines is as schemed
Shown in 3, by current rotor rotational speed omegarmeasiDetermine optimal power track reference value PMPPTi, with electromagnetic power adjustment resultant signal △ Pi
Electromagnetic power reference value P is obtained after superpositionrefi, output electromagnetic power P is obtained after being acted on via rotor-side converterei, electromagnetism turn
Square TeiWith machine torque TmiTorque official post rotor action.Wherein, realize that the mode of optimal power tracking operation is to maintain blade tip
Speed is than being optimum tip-speed ratio λMPPTiIt is constant, it is maximal wind-energy usage factor C so as to keep power coefficientpmaxIt is constant.Most
P under excellent power tracking patternMPPTiShown in method of determination such as formula (3).
Wherein, ρ is atmospheric density, unit kg/m3；riFor wind turbine impeller radius, unit m.
Work as P△>When 0, all equal off-loads of unit are operated under suboptimum power tracking pattern in wind power plant, are called Working mould
Formula two.P in suboptimum power tracking curve such as Fig. 4deliIt is shown, in figure, P3iFor active surplus, PMPPTiIt is tracked for optimal power bent
Line, PdeliFor off-load curve (being same concept with suboptimum power tracking curve).For example, when Wind turbines off-load to 80% fortune
During row, PMPPTiIt is to be connected by the maximum power value point under each wind speed, and PdeliBe by under each wind speed most
What 80% point of high-power value connected, and P3iThe then difference for the two, as 20% maximum power value.
If wind power plant is abandoned into air quantity P△It evenly distributes to the off-load operation power of every Fans, then every Wind turbines
Pe2iIt can be determined by formula (4).
Under this operating mode, Wind turbines are according to suboptimum power tracking curve motion.The operation logic of Wind turbines is such as
Shown in Fig. 3, by suboptimum power tracking reference value PdeliSubstitute PMPPTi, with electromagnetic power adjustment resultant signal △ PiElectricity is obtained after superposition
Magnetic power reference value PrefiAct on rotor-side converter.Wherein, suboptimum power tracking reference value PdeliIt is determined by formula (5).
Wherein, ωrdeliTo make running of wind generating set in the rotor speed of suboptimum power tracking curve, unit p.u.；
ωrMPPTiTo make running of wind generating set in the rotor speed of optimal power aircraft pursuit course, unit p.u..
Step 4: the vibration frequency isolated in step 1 is higher thanSignal △ fHi, it is as shown in Figure 2 that its is defeated
Enter in virtual inertia controlling unit, obtain electromagnetic power adjustment signal △ PHi, as shown in formula (6).
For its operation logic as shown in figure 3, when system frequency reduces, virtual inertia link exports an enhancing output electromagnetism
The signal of power, by changing electric current and voltage increase electromagnetic power in rotor-side converter, electromagnetic power is higher than machine at this time
Tool power, rotor speed reduce, and rotor kinetic energy, which is converted into electric energy, increases Wind turbines output；When system frequency increases, superposition
One signal for weakening output electromagnetic power reduces electromagnetic power, and electromagnetic power is less than mechanical output at this time, and rotor speed increases,
Electric energy is converted into rotor kinetic energy storage.And since controlled plant is higher than for vibration frequencySignal, rotor actuation time
Less than rotor inertia time constant, rotor ensures Wind turbines always in action state energy always in dynamic equilibrium
Average output is constant under long time scale, and the processing method of the part signal is in 2 two kinds of moulds of operating mode one and operating mode
It can come into operation under formula.
The vibration frequency isolated in step 1 is less thanSignal △ fLi, can only be in two times progress of operating mode
Processing.Electromagnetic power adjustment signal △ P after the part signal feed-in droop control link, will be obtained as shown in Figure 3Li, such as formula (7)
It is shown.
Step 5: as shown in figure 3, adjustment signal △ PLiWith △ PHiThe resultant signal △ of electromagnetic power adjustment is obtained after superposition
Pi, negated and suboptimum power tracking reference value PdeliSuperposition, obtains electromagnetic power reference value Prefi, electromagnetic power is referred to
Value PrefiRotor current transformer is acted on, obtains electromagnetic power Pei。
Under pattern two, every unit is with Pe2iPower off-load operation, reserve the active surplus P available for frequency modulatione1i-
Pe2i.Wind turbines off-load operation frequency modulation principle as shown in figure 5, in figure dotted line be optimal power tracking mode, the solid line in left side
Two kinds of off-load operational modes are represented respectively with the chain-dotted line on right side.Under conditions of propeller pitch angle is constant, for any fixed wind speed
Operating mode other than maximum power point, can all be caught there are two the same point of wind power coefficient, such as in wind speed for 9m/s time points A and E
The wind power obtained is the same, but generator amature rotating speed is different, is respectively at high rotating speed and the slow-speed of revolution.Subtract due to the use of rotating speed is increased
During load pattern, some energy can be stored as rotor kinetic energy, be more advantageous to the utilization of energy, therefore select right side
Chain-dotted line representated by off-load operational mode.When wind speed is 9m/s, Wind turbines are in the A points under off-load state, at this time
Load increase causes frequency to decline, and droop control link exports one and increases the signal contributed, and frequency converter quick acting increases electromagnetism
Performance number so that electromagnetic power, which is more than, adjusts slow mechanical output, and electromagnetic power rises to B points by the A point moments in Fig. 5,
And mechanical output then slowly rises along A-F sections of characteristic curve, electromagnetic power is more than mechanical output at this time, and rotor speed gradually drops
Low, electromagnetic power is also declined along maximum power tracking curve gradually by B points, is finally reached new balance in F points, is achieved in
Off-load frequency modulation of the Wind turbines under rotor speed control.
With reference to step 4 it is found that Wind turbines are once only higher than vibration frequency in operating modeSignal △ fHiIt rings
Should, droop control channel disconnects.The electromagnetic power reference value P obtained under the patternrefiAs shown in formula (8).
Prefi=PMPPTi-△PHi (8)
Formula (9) can be obtained by formula (3), formula (8).
And work as Wind turbines under operating mode two, vibration frequency is higher thanSignal △ fHiIt is less than with vibration frequencySignal △ fLiIt responds, the electromagnetic power reference value P obtained under the patternrefiAs shown in formula (10).
Prefi=Pdeli-(△PHi+△PLi) (10)
Formula (11) can obtain by formula (5), formula (6), formula (7).
Specific embodiment two：With the measured data intercepted in 4 points to 5 periods of certain wind power plant, wind-powered electricity generation permeability is established
Wind fire for 20% combines frequency modulation model, is emulated using the disturbance that one group of standard deviation is 0.008.60 are shared in the wind power plant
Platform 2MW units, unit model W2000-87, the current output that limits do not occur abandoning wind for 120MW.W2000-87 model wind-force
Generator basic parameter is as shown in table 1.
Table 1：2000-87 model wind-driven generator basic parameters
Step 1：Wind turbines rotor inertia time constant HiFor 5s, the high pass as shown in solid box on the left of Fig. 2 is designed
Wave filterVibration frequency in power grid is higher than to the frequency departure signal △ f of 0.2HzHiIt separates, as shown in Figure 6；
Step 2：Introduce inertia control in Wind turbines, short point in additional virtual inertia Absent measures block diagram such as Fig. 2
Shown in dashed part, it is made of differentiation element and proportional component two parts, proportionality coefficient is set as 2Hi, as 10s.Due to
Wind turbines non-off-load operation at this time, Ri→ ∞ disconnects droop control channel.The differentiation of running of wind generating set pattern is in step
It is illustrated in three；
Step 3：Operational mode is set according to the landscape condition of abandoning that wind power plant is current.There is the wind power plant of 60 2MW Wind turbines
It is current to limit output PoutFor 120MW, by wind speed situation of change in wind power plant 200s as shown in Figure 7, wind-powered electricity generation in the corresponding period is known
Optimal power of the field under current wind speedAs shown in Figure 8.By formula (1) know wind power plant it is current abandon air quantity P△≤0。
By P△≤ 0, all units operate in operating mode one in wind power plant, under optimal power tracing mode.In this work
Under operation mode, Wind turbines are run always according to optimal power aircraft pursuit course.The operation logics of Wind turbines as shown in figure 3, by
Current rotor rotational speed omegarmeasiDetermine optimal power track reference value PMPPTi, with electromagnetic power adjustment resultant signal △ PiAfter superposition
To electromagnetic power reference value Prefi, output electromagnetic power P is obtained after being acted on via rotor-side converterei, electromagnetic torque TeiWith machine
Tool torque TmiTorque official post rotor action.Realize that the mode of optimal power tracking operation is to maintain tip speed ratio as best blade tip
Speed compares λMPPTiIt is constant, it is maximal wind-energy usage factor C so as to keep power coefficientpmaxIt is constant.Atmospheric density is taken as
1.295kg/m3, the P under optimal power tracing modeMPPTiShown in method of determination such as formula (2).
Step 4：It is higher than the signal △ f of 0.2Hz for the vibration frequency isolated in step 1Hi, as shown in Figure 2 by it
It inputs in virtual inertia controlling unit, electromagnetic power adjustment signal △ P is obtained by formula (3)Hi, as shown in Figure 9.
Step 5：Wind turbines are once only higher than vibration frequency in operating mode the signal △ f of 0.2HzHiResponse, the mould
The electromagnetic power reference value P obtained under formula by formula (4)refiAs shown in the chain-dotted line in Figure 11.
Mains frequency and wind energy conversion system output the situation of change difference obtained according to the frequency modulation method by step 1 to step 5
As shown in Figure 10 and Figure 11.Solid line has neither part nor lot in situation when primary frequency modulation relies only on fired power generating unit frequency modulation for Wind turbines in figure,
Chain-dotted line shares situation during primary frequency modulation task for Wind turbines participation primary frequency modulation Wind turbines jointly with fired power generating unit.By
The simulation result comparative analysis of Figure 10 knows that Wind turbines inertia control improves the frequency dynamic stabilization of system under actual wind speed
Property, the variance of system frequency deviation is 3.1776 × 10 when Wind turbines have neither part nor lot in primary frequency modulation-6Pu, and Wind turbines participate in one
The variance of system frequency deviation after secondary frequency modulation is 2.5939 × 10-6Pu, since the inertial control system frequency of Wind turbines is inclined
The variance of difference falls to original 0.8 times.When system frequency reduces, virtual inertia link exports an enhancing output electromagnetic work
The signal of rate, by changing electric current and voltage increase electromagnetic power in rotor-side converter, electromagnetic power is higher than machinery at this time
Power, rotor speed reduce, and rotor kinetic energy, which is converted into electric energy, increases Wind turbines output；When system frequency increases, superposition one
A signal for weakening output electromagnetic power reduces electromagnetic power, and electromagnetic power is less than mechanical output, rotor speed raising, electricity at this time
Rotor kinetic energy storage can be converted into.
And average output of Wind turbines when having neither part nor lot in primary frequency modulation is 0.7786pu, after Wind turbines participate in primary frequency modulation
Average output for 0.7785pu, (in Figure 12, solid line is overlapped with chain-dotted line) as shown in figure 12 show that Wind turbines are tactful with this
Participating in contributing on it during primary frequency modulation does not influence.It demonstrates when controlled plant is higher than 0.2 signal for vibration frequency, due to
Rotor actuation time is less than rotor inertia time constant, and rotor always in action state, in dynamic equilibrium, protect always by energy
The average output for demonstrate,proving Wind turbines is constant under long time scale.
Specific embodiment three：With the measured data intercepted in 3 points to 4 periods of certain wind power plant, wind-powered electricity generation permeability is established
Wind fire for 20% combines frequency modulation model, is formed by stacking using the disturbance that one group of standard deviation is 0.008 with step signal compound
Disturbance is emulated.60 2MW units, unit model W2000-87, basic parameter such as 1 institute of table are shared in the wind power plant
Show.When wind speed is 10.5m/s, wind power plant, which limits, contributes as 94MW.
Step 1：Wind turbines rotor inertia time constant HiFor 5s, the high pass as shown in solid box on the left of Fig. 2 is designed
Wave filterVibration frequency in power grid is higher than to the frequency departure signal △ f of 0.2HzHiIt separates, such as the reality in Figure 13
Shown in line (by taking network load anticlimax 1% as an example)；Design the low-pass filter as shown in Fig. 2 left-hand broken line framesIt will be electric
Vibration frequency is less than the frequency departure signal △ f of 0.2Hz in netLiIt separates, (with network load as shown in Figure 13 chain lines
For anticlimax 1%)；
Step 2：Introduce inertia control in Wind turbines, short point in additional virtual inertia Absent measures block diagram such as Fig. 2
Shown in dashed part, it is made of differentiation element and proportional component two parts, proportionality coefficient is set as 2Hi, as 10s.Power grid
Permitted maximum frequency deviation △ f are 4 × 10 during normal operation-3P.u., optimal power of the Wind turbines under current wind speed
Pe1iFor 0.7824p.u., the off-load operation power P of Wind turbinese2iFor 0.7042p.u., Pe2iValue and wind power plant it is current
It is related to abandon air quantity, setting method illustrates in step 3.Long chain-dotted line part institute in droop control Absent measures block diagram such as Fig. 2
Show, its sagging coefficients R is obtained by formula (1)iIt is 0.05.
Step 3：Operational mode is set according to the landscape condition of abandoning that wind power plant is current.When wind speed is 10.5m/s, there are 60
The wind power plant of 2MW Wind turbines limits output PoutFor 84MW, by formula (2) know wind power plant it is current abandon air quantity P△For 9.89MW.
By P△>0, all equal off-loads of unit operate in operating mode two in wind power plant, under suboptimum power tracking pattern.By wind
Electric field abandons air quantity P△It evenly distributes to every Fans, the off-load for knowing Wind turbines by formula (3) runs power Pe2iFor
0.7042p.u.。
Suboptimum power tracking curve is as shown in figure 4, in figure, P3iFor active surplus, PMPPTiFor optimal power aircraft pursuit course,
PdeliFor off-load curve.At this point, Wind turbines off-load to 90% operation, PMPPTiIt is by the maximum power value point under each wind speed
What connection obtained, and PdeliIt is to be connected by 90% point of the maximum power value under each wind speed, and P3iIt is then the two
Difference, as 10% maximum power value.
Under this operating mode, Wind turbines are according to suboptimum power tracking curve motion, suboptimum power tracking reference value
PdeliIt is determined by formula (4).
Wherein, ωrdeliTo make running of wind generating set in the rotor speed of suboptimum power tracking curve, unit p.u.；
ωrMPPTiTo make running of wind generating set in the rotor speed of optimal power aircraft pursuit course, unit p.u..
Step 4：It is higher than the signal △ f of 0.2Hz for the vibration frequency isolated in step 1Hi, as shown in Figure 2 by it
It inputs in virtual inertia controlling unit, electromagnetic power adjustment signal △ P is obtained by formula (5)Hi, as shown in solid in Figure 14.
It is less than the signal △ f of 0.2Hz for the vibration frequency isolated in step 1Li, as shown in Figure 2 by the part signal
After feed-in droop control link, electromagnetic power adjustment signal △ P are obtained by formula (4)Li, as shown in phantom in Figure 14.
As shown in figure 3, adjustment signal △ PLiWith △ PHiThe resultant signal △ P of electromagnetic power adjustment are obtained after superpositioni, such as Figure 15
It is shown.Wind turbines are higher than vibration frequency the signal △ f of 0.2Hz under operating mode twoHiIt is less than 0.2Hz with vibration frequency
Signal △ fLiRespond.
Step 5: by △ PiIt negates and suboptimum power tracking reference value PdeliSuperposition obtains electromagnetic power reference value by formula (5)
Prefi。
According to the frequency modulation method by step 1 to step 5, the system stable to one distinguishes anticlimax load in 10s
2%th, anticlimax load 1%, sudden increase in load 1%, sudden increase in load 2%, the simulation result point of mains frequency situation of change in 200s
Not as shown in Figure 16, Figure 17, Figure 18, Figure 19.When solid line has neither part nor lot in primary frequency modulation and relies only on fired power generating unit frequency modulation for wind turbine in figure
Situation, chain-dotted line participates in system frequency when primary frequency modulation Wind turbines and fired power generating unit share primary frequency modulation task jointly for wind turbine
The situation of change of rate deviation.By simulation result it is found that after wind-powered electricity generation participation primary frequency modulation, when sudden load change 2%, system frequency is inclined
Difference variation amplitude 0.0032pu is decreased to by 0.0037pu, when sudden load change 2% system frequency deviation variation amplitude by
0.0019pu is decreased to 0.0016pu, demonstrates the stability enhancing that Wind turbines participate in system frequency after primary frequency modulation.
Claims (2)
1. Wind turbines frequency-division section participates in electric system primary frequency modulation method, which is characterized in that includes the following steps：
Step 1: use high-pass filterVibration frequency in power grid is higher thanFrequency departure Signal separator come out,
It is denoted as Δ fHi；Use low-pass filterVibration frequency in power grid is less thanFrequency departure Signal separator come out, remember
For Δ fLi, wherein HiFor Wind turbines rotor inertia time constant, subscript i represents i-th Wind turbines, and s represents to transmit letter
Number；
Step 2: introducing inertia control link and droop control link in Wind turbines, the inertia control link includes void
Intend inertial element, which is made of differentiation element and proportional component two parts, wherein the ratio system of proportional component
Number is set as 2Hi；The sagging coefficients R of droop control linkiIt is determined by formula (1)；
Wherein, permitted maximum frequency deviation when Δ f is power grid normal operation, unit p.u.；Pe1iWorking as Wind turbines
Optimal power under preceding wind speed, unit p.u.；Pe2iOff-load for Wind turbines runs power, unit p.u.；
Step 3: operational mode is set according to the current landscape condition of abandoning of wind power plant：
If the optimal power under i-th current wind speed of Wind turbines in wind power plant is Pe1i, have n platform units, wind-powered electricity generation in wind power plant
Current limit in field is contributed as Pout, then what wind power plant was current abandons air quantity PΔAs shown in formula (2)：
Work as PΔWhen≤0, all units are operated under optimal power tracing mode in wind power plant, are called operating mode one；
Work as PΔ>When 0, all equal off-loads of unit are operated under suboptimum power tracking pattern in wind power plant, are called operating mode two；
Step 4: when Wind turbines are in operating mode for the moment, electromagnetic power reference value PrefiAs shown in formula (8)：
Prefi=PMPPTi-ΔPHi (8)
Wherein, PMPPTiFor optimal power track reference value；
When Wind turbines are in operating mode two, electromagnetic power reference value PrefiAs shown in formula (10)；
Prefi=Pdeli-(ΔPHi+ΔPLi) (10)
Electromagnetic power adjustment signal delta PHiAcquisition methods be：The vibration frequency isolated in step 1 is higher thanLetter
Number Δ fHi, the virtual inertia link that sets in input step two obtains electromagnetic power adjustment signal delta PHi, such as formula (6) institute
Show：
Electromagnetic power adjustment signal delta PLiPreparation method be：The vibration frequency isolated in step 1 is less thanLetter
Number Δ fLi, droop control link is inputted, obtains electromagnetic power adjustment signal delta PLi, as shown in formula (7)：
PdeliFor suboptimum power tracking reference value；
Step 5: by electromagnetic power reference value PrefiRotor current transformer is acted on, completes primary frequency modulation process.
2. according to the method described in claim 1, it is characterized in that, suboptimum power tracking reference value PdeliIt is determined by formula (5)：
Wherein, ωrdeliTo make running of wind generating set in the rotor speed of suboptimum power tracking curve, unit p.u.；ωrMPPTi
To make running of wind generating set in the rotor speed of optimal power aircraft pursuit course, unit p.u., ωrmeasiFor current rotor rotating speed.
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