CN107276120A - A kind of double-fed blower fan Synchronous Motor System and the method for suppressing synchronous generator vibration - Google Patents
A kind of double-fed blower fan Synchronous Motor System and the method for suppressing synchronous generator vibration 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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Abstract
The invention discloses a kind of double-fed blower fan Synchronous Motor System and the method for suppression synchronous generator vibration；Detect that line voltage obtains the dq axis component signals of line voltage by phaselocked loop, two thermal compensation signals are obtained by the processing of two different error amplifiers and phase compensator unit；Two thermal compensation signals respectively as wind power generator rotor side current transformer current control feedforward, in the command value for being added to rotor current dq axis components, for compensating the dq components of rotor current respectively.Controlled by the compensation to rotor current, to control the built-in potential amplitude phase of double-fed blower fan, the amplitude phase of synchronous motor built-in potential is further influenceed by transmission line of electricity, the effect for the vibration for suppressing synchronous generator is reached.Because the corresponding speed of electric current loop is fast, the quick trace command value of electronic current dq components energy, thus when synchronous generator vibrates, energy rapid extraction oscillator signal, and provide positive damping by the quick vibration to synchronous machine rotor of additional stability signal.
Description
Technical field
The invention belongs to field of new energy generation, more particularly, to a kind of double-fed blower fan Synchronous Motor System and suppression
The method of synchronous generator vibration.
Background technology
China has become the production of energy state and country of consumption of the first in the world since two thousand and ten, however, undesirable energy
Source consumption structure, causes China while being faced with the energy problem of sternness.On the one hand, there is peace in the supply of coal in China and oil
Full risk problem.In terms of energy resource supply aspect, Chinese Energy situation with the increasing rapidly of total demand, external dependence degree not
Disconnected rise and it is more fragile.On the other hand, a large amount of consumption of coal and oil, cause serious environmental problem.China is certainly
The big carbon emission state of the first in the world has been had become since 2008.The problem of China's haze, its main reason is also due to substantial amounts of
Coal and oil are used.Signed according to 2016《Paris climate agreement》, it is Chinese to propose that titanium dioxide will be made in or so the year two thousand thirty
Carbon emission reaches peak value, and strives for realizing as early as possible.The year two thousand thirty unit GDP CO2 emission declined than 2005
60%-65%, the non-fossil energy accounts for primary energy consumption ratio and weighed to 20% or so.It can be seen that, reduce the fossil energy such as coal
Source consumption proportion has become the developing direction of following country.The use of regenerative resource is to solve the important of this problem to arrange
Apply.Wherein, wind-power electricity generation is most potential a kind of form in regenerative resource.
Although the wind-power electricity generation of China is started late, development is swift and violent.According to statistics, the wind energy content that China can develop
About 1,000,000,000 kilowatts, wherein, about 2.53 hundred million kilowatts of land wind energy content (presses the liftoff 10 meters of height material computations in land), marine
Can development and utilization about 7.5 hundred million kilowatts of wind energy content.Counted according to National Energy Board, to the end of the year 2016, the grid-connected wind-force of China
Generating set capacity reaches 148,640,000 kilowatts, accounts for the 9.03% of grid-connected unit capacity, generated energy is steadily improved in recent years, 2016
Year wind-power electricity generation electricity accounting has reached 4%.Due to China's wind resource skewness, a large amount of high-quality wind-resources concentrate on west
Backlands area, the Northeast.Particularly, in the Inner Mongol, Xinjiang, Gansu, wind-power electricity generation installation accounts for its whole province's total installed capacity respectively
23.15%th, 22.91%, 26.9%；In the whole province's power network of northwest five, accumulative grid connected wind power accounts for its whole network total installed capacity
19.6%.It can be seen that, the ratio of wind-powered electricity generation is at a relatively high in NORTHWEST CHINA, northeast region.Wind-powered electricity generation has been in partial electric grid
As main power supply.As ratio of the wind-power electricity generation in power system is increasingly improved, its dynamic process to power system
Also gradually show with stable influence, as focus of attention in industry.Particularly, a lot of wind-powered electricity generation off-grid things occur in recent years
Therefore, seriously threaten the safe and stable operation of power system.Study the characteristic of wind-power electricity generation and its to power system security
Stable influence has become urgent demand
Due in conventional electric power system, synchronous generator is as main, or even unique power supply, and its dynamic characteristic is direct
Determine the dynamic characteristic of system.With the raising of wind-powered electricity generation permeability, situation is then different.Wind-driven generator is to synchronous generator
The influence of machine low-frequency oscillation needs deeper understanding.On the one hand, some results of study are found as double-fed wind power generator oozes
Saturating rate and the increase exerted oneself, the damping of system gradually become strong, it is believed that this is just because of double-fed wind power generator in itself as one
Asynchronous generator, which creates slip power to system there is provided caused by positive damping.On the other hand, some research discoveries pass through
The mode of synchronous generator is replaced, finds, as wind-powered electricity generation permeability is improved, system damping can be caused to decline, it is believed that this is due to tide
Caused by stream is improved, because sensitivity analysis finds damping, the sensitivity to wind-driven generator is very low, and quick voltage is controlled to being
System damping is also without material alterations.In other researchs, then it is assumed that wind-driven generator, which may both strengthen damping, to be cut
Underdamping.Different researchs have obtained conflicting result, caused by this is due to the condition of contrast.If increasing in systems
Plus wind-driven generator, the change of topological sum trend can be caused, this can inherently cause the change that synchronous generator is damped；And if replacing
The synchronous generator of capacity such as change, but because synchronous generator will result in the influence of damping to synchronous generator, this is also difficult to
Illustrate to change to system damping after wind-driven generator access which type of influence bottom generates.Therefore, for logically, need
Looking for one does not have the reference scene of damping effect to system.
In summary, wind-driven generator characteristic enrich, its to synchronous generator damping effect quality be all possible to
's.The mechanism and physical process of influence are produced on synchronous generator for wind-driven generator, with greater need for further studying.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides one kind based on the suppression of Double-feed wind power unit
The method of synchronous generator vibration processed, has broken wind-driven generator to the indefinite limitation of synchronous generator damping effect, real
The effect that control wind turbine power generation machine provides synchronous generator positive damping is showed, so as to suppress the vibration of synchronous generator.
The invention provides a kind of double-fed blower fan Synchronous Motor System, including：Synchronous generator SG, wind-driven generator, rotor
Side converter, net side current transformer, net side inductance Lg, DC capacitor C, phaselocked loop and signal processor；The input of the phaselocked loop
Hold for being connected to power network, the phaselocked loop is used to gather mains voltage signal, and the mains voltage signal is changed
Grid voltage amplitude variable quantity d axis components are exported afterwardsWith phase changing capacity q axis componentsThe input of the signal processor
End is connected to the output end of the phaselocked loop, and the signal processor is used for the d axis components according to the power network amplitude variable quantityWith phase changing capacity q axis componentsOutput rotor side electric current loop auxiliary control signal irdconAnd irqcon；The rotor-side becomes
The control end of stream device is connected to the output end of the signal processor, and the output end of the rotor-side converter is connected to the wind
The current controling end of power generator；The electric capacity C is connected to the connection end of the net side current transformer and the rotor-side converter
Between, the other end ground connection of the electric capacity C；When line voltage is changed due to synchronous machine vibration, become according to rotor-side
The auxiliary control signal for flowing the current loop controller of device changes current control instruction ir, so as to change the output of rotor side converter
The amplitude and phase of rotor voltage built-in potential, so as to change the air-gap field of synchronous generator, and then send out stator output voltage
It is raw to change, the amplitude and phase of synchronous generator built-in potential are further influenceed by transmission line of electricity.
Further, the phaselocked loop includes：Park converters, PI controllers and integrator；The electricity of Park converters
Pressure input is used to receive mains voltage signal VA、VB、VC, the feedback input end of Park converters is connected to the integrator
Output end, the Park converters are used for defeated by the first output end after mains voltage signal progress two-phase rotating coordinate system conversion
Go out the d axis components of power network amplitude variable quantityWith the q axis components that grid phase variable quantity is exported by the second output endPark
The output of converter is the output of phaselocked loop.It is second defeated that the input of the PI controllers is connected to the Park converters
Go out end, the PI controllers are used for the q axis componentsω is obtained after carrying out PI processingp, represent what phaselocked loop measurement was obtained
Mains frequency；The input of the integrator is connected to the output end of the PI controllers；The integrator is used for the ωp
It is integrated after processing and obtains line voltage phase θp, the feedback input end converted as Park.
Further, signal processor includes：For first output end of phaselocked loopFor, it is sequentially connected
First error amplifier and first phase compensator, its input are used to receive d axis componentsIt is defeated for the second of phaselocked loop
Go out endIt is then high-pass filter, the second error amplifier being sequentially connected, second phase compensator；Described high-pass filtering
The input of device is used to receive q axis componentsIt is auxiliary that the output end of the first phase compensator is used for output rotor side electric current loop
Help control signal irdcon；The output end of the second phase compensator is used for the electric current loop auxiliary control letter for exporting net side current transformer
Number irqcon。
Further, rotor-side converter includes：The adder being sequentially connected, pi regulator, vector modulator SVM with
And on-off circuit；The first input end of the adder is used to receive rotor-side current reference command value idref/iqref, second is defeated
Entering end is used to receive electric current auxiliary control signal irdcon/irqcon, q axis component i of the 3rd input for receiving rotor currentrd/
irq, the output end of the on-off circuit exported for controlling the current control of generator to instruct ir；When power network is normally run, electricity
Flow auxiliary control signal irdcon/irqconIt is zero, idref/iqrefWith ird/irqCurrent error value is obtained after addition, electric current is missed
Difference sequentially passes through the rotor electricity that the on off sequence for controlling the first switch circuit is obtained after PI regulations and Vector Modulation
Press control signal；When due to synchronous generator vibration and generation fluctuation occur for line voltage, irdcon/irqconIt is not zero, detects
Voltage magnitude and phase fluctuation composition to power network are acted on current loop control branch road by adder, by changing electric current control
System instruction ird/irq, so as to change the amplitude and phase of the rotor voltage of rotor side converter output, so as to change synchronous generator
The air-gap field of machine, and then stator output voltage is changed, synchronous transmission line of electricity influences the width of synchronous generator built-in potential
Value and phase, so as to vibrate offer positive damping, suppress the vibration of synchronous generator.
Present invention also offers a kind of method for suppressing synchronous generator vibration based on above-mentioned Double-feed wind power unit, bag
Include following step：
(1) the d axis components for representing grid voltage amplitude are obtained after handling the mains voltage signal of collectionAnd generation
The q axis components of table electric network voltage phase
(2) by the d axis components of grid voltage amplitudeCarry out error amplification to handle with phase compensation, obtain rotor-side change
Flow first auxiliary control signal i of the current loop controller of devicerdcon；By the q axis components of grid voltage amplitudeCarry out error
Amplification is handled with phase compensation, obtains second auxiliary control signal i of the current loop controller of rotor-side converterrqcon；
(3) when due to synchronous generator vibration and generation fluctuation occur for line voltage, according to the electricity of rotor-side converter
The auxiliary control signal for flowing ring controller changes current control instruction ir, so as to change the rotor voltage of rotor side converter output
Command value, so as to change the air-gap field of synchronous generator, and then stator output voltage is changed, synchronous transmission line of electricity
The amplitude and phase of synchronous generator built-in potential are influenceed, so as to vibrate offer positive damping, suppresses the vibration of synchronous generator.
Further, in step (1), power network is obtained after carrying out two-phase rotating coordinate system conversion to mains voltage signal
The d axis components of voltage magnitudeWith q axis components
By the contemplated above technical scheme of the present invention, compared with prior art, due to being generated electricity simultaneously in large-scale wind
In the case of net, when occurring synchronous machine vibration in power network, directly pass through double-fed wind power generator phaselocked loop signal transacting
And the voltage magnitude and phase of feedback control power network, equivalent to the positive damping torque of synchronous machine is supplied to, so as to suppress synchronous hair
Motor vibrates, faster than traditional suppression oscillator device, and the power network oscillator signal obtained by phaselocked loop measurement bandwidth more
Greatly, the oscillation modes such as low-frequency oscillation and the sub-synchronous oscillation of synchronous machine can be suppressed simultaneously, while relative in synchronous generator
In install remaining equipment such as PSS stabilizers etc. additional, electric grid investment cost can be saved from economy point.
Brief description of the drawings
Fig. 1 is that two machine structures of the Double-feed wind power unit suppression synchronous generator vibration provided based on present example are shown
It is intended to；
Fig. 2 is the phase lock control structural representation that present example is provided；
Fig. 3 is at a kind of signal for the rotor-side converter current loop controller auxiliary control signal that present example is provided
Manage structural representation；
Fig. 4 is the knot that rotor-side converter current loop controller auxiliary control signal controls rotor-side converter output voltage
Structure schematic diagram.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The present invention by have extensively studied the influence of phaselocked loop, analysis research double-fed wind power generator built-in potential generator rotor angle with
The interphase interaction of power angle of synchronous generator, finds when phaselocked loop underdamping and bandwidth are close to synchronous generator frequency of oscillation,
Double-fed wind power generator can be significantly participated in vibration, cause persistent oscillation.Based on this research, the present invention is by giving double-fed blower fan
Rotor-side converter adds additional control signals, so as to control generator built-in potential amplitude phase to influence synchronous machine built-in potential
Amplitude phase, is inhibited so that synchronous generator must vibrate.
The invention provides a kind of method for suppressing synchronous generator vibration based on Double-feed wind power unit, pass through phaselocked loop
Pair and the signal acquisition of voltage on line side and carry out Park conversion and the amplification of follow-up error and phase compensation processing, obtaining can be with table
Two disturbance quantities of system oscillation are levied, auxiliary control signal are provided for the current regulator control of rotor-side converter, so as to control
The built-in potential amplitude and phase of double fed electric machine rotor side converter output, further influence electric in synchronous motor by transmission line of electricity
The amplitude phase of gesture, and then realize the effect that control wind turbine power generation machine provides synchronous generator positive damping.By vibration theory
Know that the positive damping of system is bigger, system oscillation just decays faster, system damping deficiency may result in oscillation and divergence, be system
There is provided positive damping can effective suppression system degree of oscillation.The present invention can pass through in the case where not changing original control framework
Wind turbine power generation machine is controlled to provide positive damping for synchronous machine, so as to suppress the vibration of synchronous generator.Consider from technology and economy,
The present invention is used by the existing control of double-fed wind power generator, is become using the signal of phaselocked loop detection process for rotor-side
The auxiliary control signal of device current loop control is flowed, positive damping is provided for synchronous generator, so as to suppress the vibration of synchronous generator.
The core content of the present invention is that the terminal voltage signal detected using phaselocked loop carries out two auxiliary controls of processing formation
Signal, auxiliary control double-fed fan rotor side converter electric current loop exports to control rotor voltage so as to control rotor current transformer
Built-in potential amplitude and phase.Signal d, q axis component obtained by the preceding phaselocked loopLine voltage is represented respectively
The disturbance component of amplitude and angular speed, and turned after first, second error amplifier and first, second phase compensator
The current loop controller auxiliary control signal of sub- side converter, so as to control amplitude and phase that rotor-side exports built-in potential.
Therefore when sub-synchronous oscillation occurs for synchronous machine, phaselocked loop forms amplitude and angle by detecting voltage ripple of power network signal
Velocity disturbance component, feeds back to rotor-side current loop controller, the voltage magnitude and phase of control rotor-side converter output lead to
Crossing transmission line of electricity further influences the amplitude phase of synchronous motor built-in potential itself, the vibration of synchronous generator is inhibited.
General principle is：When synchronous machine vibrates, also sent out by the amplitude and phase of system voltage after transmission line of electricity
Raw corresponding disturbance, utilizes phaselocked loop collection and net side voltage signal VA、VB、VC, it is subjected to Park under phaselocked loop coordinate system
Conversion, obtains q axis componentsWith d axis componentsUtilize the q axis components of simultaneously voltage on line sideIntegration obtains line voltage phase
The angular speed changing value of position.The electric current loop of rotor-side converter is obtained after the first error amplifier and first phase compensator
The d shaft currents instruction ancillary relief signal of control.Similarly utilize the d axis components using simultaneously voltage on line sideIt is used as line voltage
Amplitude disturbance component can obtain rotor-side converter current loop control q shaft currents instruction ancillary relief signal.It is attached to
Rotor d shaft currents error signal and rotor q shaft current error signals are obtained in the current controling signal of rotor current transformer, passes through PI
Controller link obtains rotor d shaft voltage signals and rotor q shaft voltage signals, forms rotor voltage vector.And then control double-fed
The built-in potential amplitude and phase of rotor side converter output, synchronous motor built-in potential is influenceed by transmission line of electricity in turn
Amplitude phase, realizes the effect that control wind-driven generator provides synchronous generator positive damping, so as to suppress synchronous hair
The vibration of motor.
Synchronous generator is suppressed based on Double-feed wind power unit in order to which further description is provided in an embodiment of the present invention
The method and system of vibration, in conjunction with accompanying drawing, details are as follows：
As shown in figure 1, a kind of method for being suppressed synchronous generator vibration based on Double-feed wind power unit, its system is included：
Synchronous generator, synchronous pusher side inductance Xt, wind-driven generator, rotor-side converter, net side current transformer, net side inductance Lg, electric capacity C,
Phaselocked loop and signal processor.When synchronous generator vibrates, pass through XtGrid entry point voltage is set also to change.Wind-power electricity generation
Wind resource is converted into power transmission into power network by machine, and rotor-side converter controls the rotor excited voltage of generator, and then
Stator voltage is controlled, change of the phaselocked loop by gathering the amplitude and phase of line voltage is supplied to the control of rotor-side converter
Device, the phase of control double-fed wind power generator tracking power network simultaneously exports required power, and signal processor is the inventive method
Core, processing was entered by the signal that phaselocked loop is gathered, and the extraction to grid voltage change component can be achieved, and then provide rotor-side
The auxiliary control signal of current transformer electric current loop dq axis controllers, so as to pass through the auxiliary control signal control to rotor-side converter
The output voltage of double-fed wind power generator processed, the amplitude and phase of synchronous generator built-in potential are further influenceed by transmission line of electricity
Position, provides positive damping, inhibitory action is played in the vibration to synchronous generator for synchronous machine vibration.
As shown in Fig. 2 phaselocked loop includes：Park converters 11, PI controllers 12 and integrator 13.Realize that stator voltage is determined
To.It is three-phase phase voltage that it, which is inputted, is output as tracking d, q shaft voltage for characterizing stator terminal voltage vector magnitude and phase place change
Component.Shown in transformation relation such as formula (1) between static three phase coordinate system and rotation dq coordinate systems.Wherein θpRotated for phaselocked loop
The phase of dq coordinate systems.
Assuming that three-phase phase voltage is respectively
Then the component under rotation dq coordinate systems, which can be obtained, by formula (1) is respectively
Work as θpDuring=ω t+ γ, it is clear that have Vsq=0.Then now θpThe phase of terminal voltage vector is equal to, and it is correspondingThen represent voltage magnitude.Then, obtained phaselocked loop is constructed using this principle.As shown in (2),Signal
To track power network amplitude as target；Signal is to track grid phase as target, by PI controllers with can obtain with integrator
The phase of voltage, and Park converters 11 are fed back to, so as to realize the tracking of grid phase.For signal processor
Two signals of required extraction, represent the amplitude and phase perturbation of system voltage, electricity are obtained by signal processor respectively
The corresponding wave component of net voltage is used for the electric current loop auxiliary control of rotor-side converter.
Present invention seek to address that in the case of existing double-fed wind power generator control technology is due to large-scale wind electricity generation grid-connecting,
The problem of synchronous machine that may trigger in the case of being died down due to system damping is vibrated.Suppression proposed by the present invention based on double-fed blower fan
The method final goal of synchronous generator vibration processed is the frequency signal to be vibrated by phaselocked loop detecting system, as double
The auxiliary control signal of wind power generator rotor side current control is presented, so as to control the output voltage of rotor-side, passes through power transmission line
Road further influences the amplitude phase of synchronous motor built-in potential itself, increases the damping of synchronous generator and then suppresses synchronous generator
The vibration of machine, a kind of feasible solution is provided for the power system stability of large-scale wind electricity generation grid-connecting.
System architecture is as shown in figure 1, main by double-fed wind power generator phaselocked loop and the signal processor structure of detection signal
Into the auxiliary control signal of generation rotor-side current loop controller, the output voltage of rotor-side converter is controlled.Phaselocked loop 1 passes through
Detection line voltage is obtainedThe fluctuation of grid voltage amplitude is represented,The fluctuation of voltage-phase is represented, by signal transacting
Device 2 obtains the auxiliary control signal i of rotor-side and net side current transformerrdcon/irqconControl the output voltage of rotor-side converter.
Fig. 2 show the typical pll controller of double-fed wind power generator, and it detects mains voltage signal VA、VB、VC
Afterwards, by its under phaselocked loop coordinate system by carrying out Park conversion, obtain q axis componentsWith d axis componentsPhase-locked loop structures
Including park converters 11, PI controllers 12 and integrator 13, wherein park converters 11 are used for power network three-phase sine-wave amount
Converted to two-phase rotating coordinate system, voltage q axis components obtain ω by PI controllers 12p, then power network obtained by integrator 13
Voltage phase θp.Wherein signal processor 2 needs the signal received to be q axis componentsWith d axis componentsVoltage is represented respectively
The fluctuation of amplitude and phase.
Fig. 3 show the concrete structure of signal processor 2, contains high-pass filter 23, the He of the first error amplifier 21
Second error amplifier 24, and first phase compensator 22 and second phase compensator 25.Will be resulting two in phaselocked loop 1
Disturbing signalBy obtaining the change component of grid voltage amplitude after bandpass filter 23, in order that double-fed wind power generator
The amplitude of rotor-side responsive electricity grid voltage and the component of angular velocity fluctuation, it is therefore desirable to two different errors of parameter of setting
Amplifier and two phase compensators, so that the amplitude and angular velocity fluctuation component of line voltage pass through two-way error amplifier
After phase compensator, the electric current loop auxiliary control signal i of rotor-side converter is respectively obtainedrdconAnd irqcon。
Fig. 4 show the current loop controller 3 of rotor-side converter, including adder 31, pi regulator 32, vector
Modulator SVM33, and on-off circuit 36.Signal irdconAnd irqconThe electric current auxiliary control letter exported for signal processor 2
Number, irdrefAnd irqrefFor current reference command value, irdAnd irqFor d, q axis component of rotor current.When power network is normally run,
Obtained voltage signal is detected by phaselocked loopBy being zero during high-pass filter 23, and useOrientation, therefore by formula
(2) analysis is understoodSo irqconAnd irdconSignal is zero, and now current loop controller is equivalent to typical electric current loop
Controller, irdrefWith irdCurrent error value is obtained by adder 31, rotor voltage d axis components are obtained by pi regulator 32
urd, irqrefWith irqCurrent error value is obtained by adder 34, rotor voltage q axis components u is obtained by pi regulator 35rq,
urdAnd urqThe on off sequence of rotor voltage control signal controlling switch circuit 36 is obtained through vector modulator SVM33；When power network electricity
In the case of pressure life low-frequency oscillation, irqconAnd irdconThe voltage magnitude of power network and the ripple components of angular speed are detected, so that
Acted on current loop control branch road, instructed by changing current control by adder 31 and 34, so as to change rotor-side change
The rotor voltage of parallel operation output, so as to control rotor output current of converter, and then makes stator output voltage change, passes through
Transmission line of electricity influences the amplitude and phase of synchronous machine built-in potential itself, suppresses synchronous generator vibration.
A kind of method for being suppressed synchronous generator vibration based on Double-feed wind power unit, is comprised the steps：
The first step, first phaselocked loop gather mains voltage signal, and the line voltage for obtaining two sign synchronous machine vibrations is disturbed
Dynamic d axis componentsQ axis components
Second step, willVoltage disturbance component is obtained by the high-pass filter of signal processor, then respectively willBy the two-way error amplifier and phase compensator of signal processor, the auxiliary of rotor-side current loop controller is obtained
Help control signal irqconAnd irdcon；
3rd step, the auxiliary control signal obtained by signal processor, the electric current loop dq axle controls with rotor-side converter
Loop processed together form closed loop, controls the rotor-side output voltage of double-fed wind power generator, passes through the further shadow of transmission line of electricity
The built-in potential amplitude and phase of synchronous generator in itself are rung, positive damping is provided for system, and then suppress the vibration of synchronous generator.
It is an advantage of the current invention that in the case of to large-scale wind generator connecting in parallel with system, overcoming double-fed wind power generator pair
The indefinite limitation of synchronous generator damping effect, has relatively good inhibition, from principle to synchronous generator vibration
On from the point of view of be easily understood, from realize with economically considering, in the case where not changing the existing control strategy of double-fed wind power generator,
Only need to produce corresponding auxiliary control signal by adding secondary control module, so that realize that blower fan suppresses synchronous machine vibration,
It is used to suppress synchronous machine vibration with respect to access other equipment such as power system stabilizer, PSS (PSS) etc., comparatively speaking
The inventive method is with good economy and realizability.
It is proposed by the present invention based on double-fed blower fan suppress synchronous generator vibration method, with good economy with
Ease for operation.As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the invention etc., it all should include
Within protection scope of the present invention.
Claims (6)
1. a kind of double-fed blower fan Synchronous Motor System, it is characterised in that including：Synchronous generator SG, wind-driven generator, rotor-side become
Flow device, net side current transformer, net side inductance Lg, electric capacity C, phaselocked loop and signal processor；
The input of the phaselocked loop is used to be connected to power network, and the phaselocked loop is used to gather mains voltage signal, and will be described
Mains voltage signal exports the d axis components of power network amplitude variable quantity after being changedWith phase changing capacity q axis components
The input of the signal processor is connected to the output end of the phaselocked loop, and the signal processor is used for according to described
The d axis components of power network amplitude variable quantityWith phase changing capacity q axis componentsOutput rotor side electric current loop d axis components and q axles
The auxiliary control signal i of current weight ring controlrdconAnd irqcon；
The net side inductance LgOne end be used for be connected to power network, the net side inductance LgThe other end be connected to the net side and become
Flow the input of device；
The control end of the net side current transformer is connected to the output end of the signal processor；
The input of the rotor-side converter is connected to the output end of the net side current transformer, the control of the rotor-side converter
End processed is connected to the output end of the signal processor, and the output end of the rotor-side converter is connected to the wind-driven generator
Current controling end；One end of the electric capacity C is connected to the connection end of the net side current transformer and the rotor-side converter, institute
State electric capacity C other end ground connection；
When line voltage is changed due to synchronous machine vibration, according to the auxiliary of the current loop controller of rotor-side converter
Control signal changes current control instruction ir, so as to change the amplitude and phase of the rotor voltage built-in potential of rotor side converter output
Position, so as to change the air-gap field of synchronous generator, and then makes stator output voltage change, further passes through transmission line of electricity
Influence the amplitude and phase of synchronous generator built-in potential.
2. double-fed blower fan Synchronous Motor System as claimed in claim 1, it is characterised in that the phaselocked loop includes：Park is converted
Device (11), PI controllers (12) and integrator (13)；
The voltage input end of Park converters (11) is used to receive mains voltage signal VA、VB、VC, Park converters (11) it is anti-
Feedback input is connected to the output end of the integrator (13), and the Park converters (11) are used to carry out mains voltage signal
The q axis components of grid phase variable quantity are exported after two-phase rotating coordinate system conversion by the second output endWith by the first output end
Export the d axis components of power network amplitude variable quantityThe output of Park converters (11) is the output of phaselocked loop (1)；
The input of the PI controllers (12) is connected to the second output end of the Park converters (11), the PI controllers
(12) it is used for the q axis componentsω is obtained after carrying out PI processingp；
The input of the integrator (13) is connected to the output end of the PI controllers (12)；The integrator (13) be used for pair
The ωpIt is integrated after processing and obtains line voltage phase θpThe feedback input end converted as Park.
3. double-fed blower fan Synchronous Motor System as claimed in claim 1 or 2, it is characterised in that signal processor (2) bag
Include：The first error amplifier (21) and first phase compensator (22) being sequentially connected, and the high-pass filter being sequentially connected
(23), the second error amplifier (24), second phase compensator (25)；
The input of first error amplifier (21) is used for the first output end for being connected to phaselocked loop (1), first phase
The output end of position compensator (22) is used for output rotor side electric current loop auxiliary control signal irdcon；
The input of the high-pass filter (23) is connected to the second output end of the phaselocked loop (1), and the second phase is mended
Repay the electric current loop auxiliary control signal i that the output end of device (25) is used to export net side current transformerrqcon。
4. the double-fed blower fan Synchronous Motor System as described in claim any one of 1-3, it is characterised in that the rotor-side converter
(3) include：First adder (31), second adder (34), the first pi regulator (32), the second pi regulator (35), vector
Modulator SVM (33) and on-off circuit (36)；
Adder (31) first input end is used to receive rotor-side current reference command value idref, the adder (34)
First input end is used to receive rotor-side current reference command value iqref, the second input is for receiving electric current auxiliary control signal
irdcon/irqcon, q axis component i of the 3rd input for receiving rotor currentrd/irq, the output end of the on-off circuit (36)
Export for controlling the current control of generator to instruct ir；
When power network is normally run, rotor-side electric current loop d shaft current auxiliary control signals irdconAnd irqconRotor-side electric current loop q axles
Electric current auxiliary control signal is all zero, idref/iqrefWith ird/irqObtain current error value after addition, current error value according to
It is secondary to be adjusted and the rotor voltage control that the on off sequence for controlling the first switch circuit is obtained after Vector Modulation by PI
Signal；
When due to synchronous generator vibration and generation fluctuation occur for line voltage, irdcon/irqconIt is not zero, detects power network
Voltage magnitude and phase fluctuation composition are acted on current loop control branch road by adder, are instructed by changing current control
ird/irq, so as to change the amplitude and phase of the rotor voltage of rotor side converter output, so as to change the gas of synchronous generator
Gap magnetic field, and then stator output voltage is changed, synchronous transmission line of electricity influences the amplitude and phase of synchronous generator built-in potential
Position, so as to vibrate offer positive damping, suppresses the vibration of synchronous generator.
5. a kind of double-fed blower fan Synchronous Motor System based on described in claim 1 come suppress synchronous generator vibration method, its
It is characterised by, comprises the steps：
(1) the d axis components for representing grid voltage amplitude are obtained after handling the mains voltage signal of collectionWith represent electricity
The q axis components of net voltage-phase
(2) by the d axis components of grid voltage amplitudeCarry out error amplification to handle with phase compensation, obtain rotor-side converter
First auxiliary control signal i of current loop controllerrdcon；By the q axis components of grid voltage amplitudeCarry out error amplification with
Phase compensation is handled, and obtains second auxiliary control signal i of the current loop controller of rotor-side converterrqcon
(3) when due to synchronous generator vibration and generation fluctuation occur for line voltage, according to the electric current loop of rotor-side converter
Two auxiliary control signals of d shaft currents controller and q shaft currents controller of controller change current control instruction ir, so as to change
Become the command value of the rotor voltage of rotor side converter output, so as to change the air-gap field of synchronous generator, and then make stator
Output voltage changes, and synchronous transmission line of electricity influences the amplitude and phase of synchronous generator built-in potential, so as to vibrate offer just
Damping, suppresses the vibration of synchronous generator.
6. method as claimed in claim 5, it is characterised in that in step (1), two-phase rotation is carried out to mains voltage signal
The d axis components of grid voltage amplitude are obtained after coordinate system transformationWith q axis components
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