CN106230021B - The transient rotor angle stability control method of regional internet power grid containing controllable inertia wind-powered electricity generation - Google Patents
The transient rotor angle stability control method of regional internet power grid containing controllable inertia wind-powered electricity generation Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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- H—ELECTRICITY
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- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
The invention discloses a kind of transient rotor angle stability control methods of regional internet power grid containing controllable inertia wind-powered electricity generation, including judging whether the generator rotor angle of the two regional internet power grids containing controllable inertia wind-powered electricity generation occurs oscillation step, if there is no oscillations, continue to monitor, if there is oscillation, power transmission side generating set G is judgedSThe output of equivalent active power and the positional relationship in power setting section if more than the section export HSvir=HSvir_max, HRvir=0；If being less than the section, H is exportedSvir=0, increase HRvirTo inertia setting range；If being located in the section, without adjusting.Compared with the control of traditional transient rotor angle stability, the present invention can put direction according to the active output state and interconnected network generator rotor angle head of generator, using corresponding inertia adjusting method, so that it is effectively solved the problems, such as power-angle oscillation between electric power generator group caused by the wind farm grid-connected and system failure, it is horizontal to improve Power Network Transient Stability.The inertia size of sub-district domain system, improves the transient stability of system where interconnected network changes it by wind power plant.
Description
Technical field
The present invention relates to a kind of Transient Stability Control method of interconnected network, especially a kind of area containing controllable inertia wind-powered electricity generation
The transient rotor angle stability control method of domain interconnected network, belongs to electricity generation system control technology field.
Background technique
Gradually mature with wind power technology, wind-electricity integration scale constantly increases, and influence of the wind power plant access to electric system is got over
Come it is more significant, wherein access wind power plant after electric system increasingly complex characteristic is showed in terms of transient state load angle characteristic.With
For variable-speed wind-power unit, by independent active adjusting, unit can fictionalize controllable inertial response and provide inertia for system
It supports, the adverse effect for effectively avoiding system inertia from weakening.But a large amount of controllable virtual inertia that variable-speed wind-power unit has, will show
The inertia size for changing interconnection two-terminal generator group is write, generator rotor angle is acutely waved between may cause electric power generator group, and it is temporary to change power grid
State maintenance level, so that the safe and stable operation of electric system becomes more acute.Therefore, this control of inertia ginseng is being increased
After number, the research virtual inertia of Wind turbines influences the transient rotor angle stability of two regional internet power grids, and utilizes virtual inertia
Improve power-angle oscillation problem, will be that can control method have more practical application value, and then improve controllable inertia interconnected network peace
The another critical issue of full operation level.
Summary of the invention
The technical problem to be solved by the present invention is providing a kind of transient state function of regional internet power grid containing controllable inertia wind-powered electricity generation
Angle stable control method.
The technical solution used in the present invention is:
A kind of transient rotor angle stability control method of the regional internet power grid containing controllable inertia wind-powered electricity generation, comprising the following steps:
Step a: judging whether the generator rotor angle of the regional internet power grid containing controllable inertia wind-powered electricity generation vibrates, if so,
Turn to step b；If not, turning to step a；
Step b: setting power setting section isInertia setting range, which is arranged, is
In formula, PSmt、PRmtRespectively power transmission side generating set GS, power side generating set GREquivalent active power output；
HSvirFor the virtual rotation inertia of power transmission side Wind turbines, meet 0≤HSvir≤HSvir_max；HRvirFor power side Wind turbines
Virtual rotation inertia meets 0≤HRvir≤HRvir_max；HSt=HS+HSvir, it is that the equivalent inertia time of power transmission side generator is normal
Number, meets HSt_min≤HSt≤HSt_max；HRt=HR+HRvir, it is the equivalent inertia time constant of power side generator, meets
HRt_min≤HRt≤HRt_max；HS、HRIt respectively send, power side generator system inertia time constant；HSvir_maxFor power transmission crosswind
The maximum value of the virtual rotation inertia of motor group；HRvir_maxFor the maximum value of the virtual rotation inertia of power side Wind turbines；
Hst_maxAnd Hst_minThe respectively maximum value and minimum value of the equivalent inertia time constant of power transmission side generator；HRt_maxAnd HRt_min
The respectively maximum value and minimum value of the equivalent inertia time constant of power side generator；
Step c: if power transmission side generating set GSEquivalent active power export PSmtGreater than the position in power setting section
Relationship turns to step d；If power transmission side generating set GSEquivalent active power export PSmtLess than the position in power setting section
Relationship is set, step e is turned to, if power transmission side generating set GSEquivalent active power export PSmtIn power setting section,
Turn to step f；
Step d: output HSvir=HSvir_max, HRvir=0；
Step e: output HSvir=0, increase HRvirTo inertia setting range；
Step f: without adjusting.
The beneficial effects of the present invention are:
Compared with the control of traditional transient rotor angle stability, strategy of the present invention can according to the active output state of generator and
Interconnected network generator rotor angle head puts direction and uses corresponding inertia adjusting method, inhibits power-angle oscillation of the interconnected network in failure existing
As improving system transient modelling power-angle stability.Under this control strategy, interconnected network has virtual used by wind power generating set
The personality inertia size living for changing its place sub-district domain system, while coordinating the inertia of the controllable wind power generating set in other regions,
The transient rotor angle stability of raising system.
Detailed description of the invention book
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is flow chart of the invention；
Fig. 2 is four machines, the two district system emulation topology diagram in the embodiment of the present invention containing wind power plant；
Fig. 3 is that system generator rotor angle when virtual inertia front and back is first to put positive swing is added in power transmission side network in the embodiment of the present invention
Correlation curve；
Fig. 4 is that system generator rotor angle when virtual inertia front and back is first to put equal backswing is added in power transmission side network in the embodiment of the present invention
Correlation curve；
Fig. 5 is by power side virtual inertia cooperation in the embodiment of the present invention to system generator rotor angle influence curve；
Fig. 6 is in the embodiment of the present invention containing controllable two regional generation system construction drawing of inertia；
Fig. 7 is in the embodiment of the present invention containing controllable two regional generation system equivalent circuit diagram of inertia；
Fig. 8 is the generator rotor angle rocking curve of dual systems in the embodiment of the present invention；
Fig. 9 is generator rotor angle acceleration alpha in the embodiment of the present inventionδWith power transmission side equivalence inertia time constant HStBetween relationship it is bent
Line；
Figure 10 is adjusting power side inertia H in the embodiment of the present inventionRtGenerator rotor angle acceleration alpha afterwardsδWith power transmission side equivalence inertial time
Between constant HStBetween relation curve；
Figure 11 is the virtual rotation inertia control structure chart of power transmission side wind power generating set in the embodiment of the present invention；
Figure 12 is the virtual rotation inertia control structure chart of power side wind power generating set in the embodiment of the present invention.
Specific embodiment
Embodiment:
As shown in Figure 1, a kind of transient rotor angle stability control method of the regional internet power grid containing controllable inertia wind-powered electricity generation, including
Following steps:
Step a: judging whether the generator rotor angle of the regional internet power grid containing controllable inertia wind-powered electricity generation vibrates, if so,
Turn to step b；If not, turning to step a；
Step b: setting power setting section isInertia setting range, which is arranged, is
In formula, PSmt、PRmtRespectively power transmission side generating set GS, power side generating set GREquivalent active power output；
HSvirFor the virtual rotation inertia of power transmission side Wind turbines, meet 0≤HSvir≤HSvir_max；HRvirFor power side Wind turbines
Virtual rotation inertia meets 0≤HRvir≤HRvir_max；HSt=HS+HSvir, it is that the equivalent inertia time of power transmission side generator is normal
Number, meets HSt_min≤HSt≤HSt_max；HRt=HR+HRvir, it is the equivalent inertia time constant of power side generator, meets
HRt_min≤HRt≤HRt_max；HS、HRIt respectively send, power side generator system inertia time constant；HSvir_maxFor power transmission crosswind
The maximum value of the virtual rotation inertia of motor group；HRvir_maxFor the maximum value of the virtual rotation inertia of power side Wind turbines；
Hst_maxAnd Hst_minThe respectively maximum value and minimum value of the equivalent inertia time constant of power transmission side generator；HRt_maxAnd HRt_min
The respectively maximum value and minimum value of the equivalent inertia time constant of power side generator；
Step c: if power transmission side generating set GSEquivalent active power export PSmtGreater than the position in power setting section
Relationship turns to step d；If power transmission side generating set GSEquivalent active power export PSmtLess than the position in power setting section
Relationship is set, step e is turned to, if power transmission side generating set GSEquivalent active power export PSmtIn power setting section,
Turn to step f；
Step d: output HSvir=HSvir_max, HRvir=0；
Step e: output HSvir=0, increase HRvirTo inertia setting range；
Step f: without adjusting.
As shown in Fig. 2, the present embodiment uses four machines, two regional internet system, which includes 2 synchronous generator G1、G2,
Active output is respectively PG1=800MW, PG2The double-fed fan motor field that=700MW and 2 capacity is 200 × 1MW, L1And L2
The respectively load in region 1 and region 2.By wind power plant DFIGS、DFIGRRespectively through bus B5、B11Access network.Wherein, synchronous
Generator G1, wind power plant DFIGSRegion 1 is constituted, is power transmission side；Synchronous generator G2, wind power plant DFIGRRegion 2 is then constituted, is
Power side.Wind speed setting is 11m/s in emulation, considers bus B8Three-phase ground failure occurs, fault time 0.1s passes through change
The virtual inertia of wind-driven generator carries out realistically displayed analysis, and it is flexible to illustrate that the present invention can be such that two regional internet systems pass through
Inertia is adjusted, and improves system transient modelling angle stability.
Fig. 3, Fig. 4 are system generator rotor angle correlation curve before and after the wind power plant additional virtual inertia for accessing power transmission side network.When connecing
Enter the double-fed fan motor field additional virtual inertial time of power transmission side network, is swung if system generator rotor angle head pendulum is positive, as shown in figure 3, being
Generator rotor angle head pendulum deviation of uniting reduces, and shows that the side additional virtual inertia improves power system transient stability；When system generator rotor angle head pendulum is anti-
To swing, as shown in figure 4, system generator rotor angle head puts deviation increase at this time, it is temporary to show that power transmission side additional virtual inertia is unfavorable for system
State is stablized.It can be seen that when wind power plant region unit be it is preceding to unit when, the speed change wind in the regional power grid can be passed through
Motor group fictionalizes inertial response, inhibits system power-angle oscillation；Conversely, to unit after the conduct of power transmission side region equivalence generator
When, as the virtual inertia of wind power plant increases in power transmission side network, system transient modelling power-angle stability is reduced, and Wind turbines are not answered at this time
Start virtual inertia control.
When after the conduct of power transmission side region generator to unit, virtual inertia in the region is adjusted reduction system is temporary
State stability.In this case, Fig. 5 is when adjusting power side Wind turbines inertia, and the generator rotor angle of system swings situation.As schemed
Show, in the case of no virtual inertia, generator rotor angle head pendulum deviation is obviously reduced, and shows can have by virtual inertia coordinated control
Effect improves power system transient stability；After the present embodiment, by sending, power side cooperation, system function can be effectively improved
Angle stability.
The present embodiment principle analysis is as follows:
Interconnection region system is after by large disturbances, can be according to damp between a group of planes if showing two group of planes waves Failure Model
A group of planes is divided into power transmission side and power side by stream flow direction, is set to a S group of planes and a R group of planes.To simplify the analysis, a two sides group of planes is distinguished
Equivalence is a synchronous generator, then interconnection region is reduced to dual systems model, generator GSRepresent the S of interconnection region system
A group of planes, GRA R group of planes is represented, then the controllable inertia generating system in two regions and its equivalent circuit are as shown in Figure 6 and Figure 7, synchronous in figure
Generator GSPositioned at power transmission side, GRPositioned at power side.Generator GS、GREquation of rotor motion can be expressed as
In formula, PSm、PRm、PSe、PRe、HS、HR、δS、δRRespectively GSAnd GRMechanical output, electromagnetic power, inertia time it is normal
Several and generator rotor angle；ω0For system nominal angular speed.
GSWith GRBetween generator rotor angle difference δ=δS-δR, formula (1), (2) subtract each other, then the equation of motion of interacted system is
Wherein,
It is assumed that during failure, generator G in dual systemsS、GROutput power is approximately 0, can be obtained by formula (3)
By formula (7) it is found that PmPositive and negative reflect generator GS、GRThe relative size of generator rotor angle acceleration in transient process.
If Pm> 0, then during failure, δS-δR> 0, i.e. system generator rotor angle head is ajusted to swing, GSTo unit, G before referred to asRTo be rear to unit；Pm
< 0, then during failure, δS-δR< 0, i.e. system generator rotor angle head put backswing, GSTo unit, G after being then known asRTo be preceding to unit.Therefore
During barrier, GSWith GRBetween forward and reverse generator rotor angle rocking curve it is as shown in Figure 8.
The system is equivalent according to the progress of the respective center of inertia with a wind-powered electricity generation group of planes by conventional power unit in two regional power grids, is applicable in
In the power-angle oscillation characteristic that qualitative analysis interacted system is interregional, equivalent inertia time constant is respectively HSt、HRt.Convolution
(3), during failure, after the controllable variable-speed wind-power unit of access inertia, then the power angle deviation for interconnecting two machine systems is represented by
In formula, PSmt=PSm+PSmw, it is generating set GSEquivalent mechanical output；PRmt=PRm+PRmw, it is generating set GR
Equivalent mechanical output；HSt=HS+HSvir, it is generating set GSEquivalent inertia time constant；HRt=HR+HRvir, it is generator
Group GREquivalent inertia time constant；PSmw、HSvir、PRmw、HRvirIt respectively send, the mechanical output and void of power side Wind turbines
Quasi- rotator inertia；αδIt is defined as the generator rotor angle acceleration of system.
By formula (9) it is found that two regional generation system generator rotor angle acceleration alpha of controllable inertiaδSize and two regional generation systems
Inertia variation and the system failure before equivalent generating set motion state it is closely related.Theoretically, variable-speed wind-power unit can be
Within the scope of wider rotational speed regulation, the inertia bigger than itself inertia is fictionalized, if Wind turbines virtual inertia adjustable range is 0
≤Hvir≤Hvir_max, then access is sent, the rotary inertia of power side system should meet respectively
HSt_min≤HSt≤HSt_max (10)
HRt_min≤HRt≤HRt_max (11)
In formula, HSt_min=HS；HSt_max=HS+HSvir_max；HRt_min=HR；HRt_max=HR+HRvir_max。
It is different from formula (7), after inertia is as adjustment parameter, generator GS、GRGenerator rotor angle head is flapped toward not in transient process
Only related to mechanical output again, inertia size equally influences acceleration alphaδSize.If Wind turbines adjust self inertia, in event
After barrier, α can be madeδReduce, and then eliminate two interregional power angle deviations, is conducive to power system transient stability, on the contrary αδIt is more big, aggravate
System unstability.
The motion state of equivalent generating set obtains interacted system generator rotor angle acceleration according to formula (9) before the consideration system failure
αδWith power transmission side regional power grid inertia HStChange curve it is as shown in Figure 9.
If before failure, power transmission side generating set GSActive power export meet
Curve a in Fig. 91-b1-c1Reflect that system generator rotor angle adds when the generated output of interacted system meets formula (12) and requires
Speed alphaδWith HStVariation relation.According to curve a1-b1-c1Changing rule it is found that with inertia HStIt is lasting to increase, system function
Angular accelerationδPositive monotone decreasing, i.e. the inertia increase of power transmission side regional power grid facilitate reduce the system failure after generator rotor angle add
Speed improves system transient modelling angle stability.At this point, the variable-speed wind-power unit in the side power grid should start virtual inertia control, it is
System provides inertia and supports, guarantees power system transient stability.
If before failure, generating set GSActive power export meet
At this point, αδWith HStChange curve such as Fig. 9 in curve a2-b2-c2It is shown.According to curve a2-b2-c2Changing rule
It is found that with inertia HStLasting to increase, system generator rotor angle acceleration is first reversely increased monotonically after positive monotone decreasing, i.e., at this time with
GSInertia increases, and interacted system Transient angle stability is first improved and reduced afterwards.Wherein, in b2When point, generator rotor angle acceleration alphaδIt is zero,
Power system transient stability reaches ideal effect.In the case, two sides wind turbine is without being adjusted.
If before failure, generating set GSActive power export meet
At this point, αδWith HStChange curve such as Fig. 9 in curve a3-b3-c3It is shown.According to curve a3-b3-c3Changing rule
It is found that with inertia HStLasting to increase, system generator rotor angle acceleration is reversely increased monotonically, i.e. power transmission side generating set inertia at this time
Increase can reduce system transient modelling angle stability.Therefore, power transmission side Wind turbines can not start virtual inertia it can be seen from curve
Control.By the virtual inertia of coordinated control both ends wind power plant, as shown in Figure 10, increase power side inertia HRt, curve a can be made3-
b3-c3Translating up makes curve zero crossing, to effectively reduce system generator rotor angle acceleration, adjusts a ' in bound such as figure3-b
′3-c′3And a '3-b′3-c′3It is shown, power side generating set equivalence inertia H within this rangeRtCondition, which should be met, is
Therefore, power side Wind turbines regulating system inertia HRvirCondition, which should be met, is
The active output of system of the blower after grid-connected can be divided into three kinds of situations according to formula (12), (13), (14), taken respectively
Corresponding inertia adjusting method, the inertia control of both ends electricity generation system can be described such as table 1.
To sum up, variable-speed wind-power unit should according to access area operation of power networks condition, flexible modulation virtual inertia, by giving,
Power side cooperation improves system generator rotor angle transient stability.Figure 11, Figure 12 are the virtual rotation inertia of double-fed wind power generator group
Control structure, wherein Figure 11 is power transmission side Wind turbines virtual inertia control structure, and Figure 12 is that power side Wind turbines are virtually used to
Property control structure.
Above-described embodiment is only used for illustrating the present invention, rather than the restriction to rights protection of the present invention is all in this hair
The change of any unsubstantiality carried out on the basis of bright essence scheme, should all fall within the scope of protection of the present invention.
Table 1
Claims (1)
1. a kind of transient rotor angle stability control method of the regional internet power grid containing controllable inertia wind-powered electricity generation, it is characterised in that: including
Following steps:
Step a: judging whether the generator rotor angle of the regional internet power grid containing controllable inertia wind-powered electricity generation vibrates, if so, turning to
Step b；If not, turning to step a；
Step b: setting power setting section isInertia setting range, which is arranged, is
In formula, PSmt、PRmtRespectively power transmission side generating set GS, power side generating set GREquivalent active power output；HSvir
For the virtual rotation inertia of power transmission side Wind turbines, meet 0≤HSvir≤HSvir_max；HRvirFor the virtual of power side Wind turbines
Rotary inertia meets 0≤HRvir≤HRvir_max；HSt=HS+HSvir, it is the equivalent inertia time constant of power transmission side generator, it is full
Sufficient HSt_min≤HSt≤HSt_max；HRt=HR+HRvir, it is the equivalent inertia time constant of power side generator, meets HRt_min≤HRt
≤HRt_max；HS、HRIt respectively send, power side generator system inertia time constant；HSvir_maxFor the void of power transmission side Wind turbines
The maximum value of quasi- rotary inertia；HRvir_maxFor the maximum value of the virtual rotation inertia of power side Wind turbines；Hst_maxAnd Hst_min
The respectively maximum value and minimum value of the equivalent inertia time constant of power transmission side generator；HRt_maxAnd HRt_minRespectively power side
The maximum value and minimum value of the equivalent inertia time constant of generator；
Step c: if power transmission side generating set GSEquivalent active power export PSmtGreater than the positional relationship in power setting section,
Turn to step d；If power transmission side generating set GSEquivalent active power export PSmtIt closes position less than power setting section
System turns to step e, if power transmission side generating set GSEquivalent active power export PSmtIn power setting section, turn to
Step f；
Step d: output HSvir=HSvir_max, HRvir=0；
Step e: output HSvir=0, increase HRvirTo inertia setting range；
Step f: without adjusting.
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| CN104779642A (en) * | 2015-04-17 | 2015-07-15 | 华北电力大学（保定） | Integrated frequency and damping control method for double-fed wind power generation unit |
| CN105048511A (en) * | 2015-06-26 | 2015-11-11 | 华北电力大学（保定） | Inertia comprehensive control method for power generation system comprising controllable inertia wind power generator |
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| CN105048511A (en) * | 2015-06-26 | 2015-11-11 | 华北电力大学（保定） | Inertia comprehensive control method for power generation system comprising controllable inertia wind power generator |
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