CN107579529A - A kind of subsynchronous suppressing method of synchronous machine based on the optimization of grid-connection converter phaselocked loop - Google Patents
A kind of subsynchronous suppressing method of synchronous machine based on the optimization of grid-connection converter phaselocked loop Download PDFInfo
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- CN107579529A CN107579529A CN201710864912.7A CN201710864912A CN107579529A CN 107579529 A CN107579529 A CN 107579529A CN 201710864912 A CN201710864912 A CN 201710864912A CN 107579529 A CN107579529 A CN 107579529A
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Abstract
The invention provides a kind of subsynchronous suppressing method of synchronous generator based on the optimization of grid-connection converter phaselocked loop, including：S1：Gather grid-connection converter electric signal amount；S2：Synchronous rotary signal delta θ is obtained according to grid-connection converter electric signal amount, to judging whether synchronous generator occurs sub-synchronous oscillation after synchronous rotary signal delta θ progress bandpass filtering treatments and according to the result of processing, if, then enter step S3, if it is not, then the bandwidth of grid-connection converter phaselocked loop is constant；S3：The damping of AC system is lifted by increasing the bandwidth of phaselocked loop, and the damping after lifting is injected into the suppression that sub-synchronous oscillation is realized in AC system.While the invention reside in power system capacity is not increased, coordinate active reactive controlling brancher, increase suppresses the inhibition of synchronous generator sub-synchronous oscillation, improves existing sub-synchronous oscillation suppression method and is suppressing the ability of sub-synchronous oscillation.
Description
Technical field
The invention belongs to electric power system stability control field, and grid-connection converter phaselocked loop is based on more particularly, to one kind
The subsynchronous suppressing method of synchronous generator of optimization.
Background technology
Synchronous generator is one of power source equipment mostly important in power system, and economic value is high, synchronous generator
Safe and stable operation plays the role of important to the safety and stability of power system.Synchronous generator sub-synchronous oscillation belongs to system and shaken
Unstability is swung, as steam turbine single-machine capacity gradually increases, the shafting of generator becomes more elongated, the characteristic of shafting
The more flexible characteristic for embodying machinery, is more prone to trigger this special mechanical-electric coupling mutually conduct, it is serious can be with
Cause generating equipment to damage, threaten the safe and stable operation of power system.
Dynamic analysis is carried out to synchronous generator shafting it is recognised that when mechanical input torque and electromagnetic damping torque are put down
During weighing apparatus, synchronous generator shafting is in stable state.When non-fundamental frequency harmonics content occurs in synchronous generator electromagnetic torque, can draw
The imbalance of synchronous generator shafting is played, in the case that the uneven torque can not access effective suppress, synchronous generator
Chance triggers various types of sub-synchronous oscillation problems, when the natural mode shape phase of the frequency of oscillation and synchronous generator shafting
When same or close, the shafting torsional oscillation problem of synchronous generator can be excited, the shafting of synchronous generator, prestige can be damaged under serious conditions
Coerce the safety and stability of power system.Such as the seventies in last century, the Mohave power plant positioned at the U.S. continuously occur by series compensation
Steam-electric generating set shafting caused by circuit vibrates damage accident, because torsional vibration frequency is located at sub-synchronous oscillation frequency range
Within, so as to cause people for the widely studied of sub-synchronous oscillation problem.
For the main electrical damping with research synchronous generator of suppression of the sub-synchronous oscillation of synchronous generator, and
The optimization of ground electrical damping is realized by some means, reaches the effect suppressed to synchronous generator sub-synchronous oscillation.And influence
The factor of electrical damping is more, such as the trend distribution of system, steady operation point, exciter control system, stabilizer control system,
Grid structure outside synchronous generator, transmission line of electricity impedance, outside other power electronics equipment etc. are more multifactor.For synchronization
The complicated electric network composition of generator-near causes to be difficult to accurately portray synchronous generator damping characteristic, can not determine each dress
Standby influence and its order of severity to synchronous generator, therefore, it is necessary to more subsynchronous concussion suppresses means in plurality of devices
Upper synergy, realize the suppression for synchronous generator sub-synchronous oscillation.
The method suppressed for existing sub-synchronous oscillation, mainly using following several measures：First：For mechanics
Section, it can be realized by the optimization design of synchronous generator shafting, avoid the natural mode shape of subsynchronous frequency range, Ke Yicong
Effective suppression to synchronous generator shafting torsional oscillation is fundamentally realized, but this method needs interdisciplinary research, is difficult in the recent period
Larger breakthrough is realized, and the effect of the synchronous generator for there is now is little.Second：, will be secondary using bandpass filter device
The harmonic components of synchronous frequency range are filtered out by wave filter, and realizing can realize in theory to hyposynchronous suppression, this method,
But in Practical Project, relatively low harmonic components, and some harmonic components are closer to fundamental frequency, can not be realized effective
Filter out.3rd：Install special subsynchronous restraining device additional near synchronous generator, such as pole is installed on synchronous generator rotor
Face winding, appended with field excitation damp controller, it can equally obtain preferable inhibition, but such subsynchronous suppressor
Function is more single, can not carry out other more Function Extensions, can not adapt to the development of following more complicated power system.
4th：Effective suppression to synchronous generator sub-synchronous oscillation is realized using the power electronic equipment with full-controlled switch device
System.By the optimization of additional accordingly control algolithm and control parameter, realize under different operating modes, to synchronous generator full range
Effective suppression of section sub-synchronous oscillation, flexibly and effectively realizes the protection to synchronous generator；Meanwhile this kind of scheme can both be selected
Select and special power electronic equipment is added in synchronous generator port, can be in normal condition while realizing sub-synchronous oscillation
The lower reactive-load compensation for realizing synchronous generator, the power electronic equipment near synchronous generator, such as new energy can also be utilized
Generate electricity, STATCOM reactive-load compensations, HVDC D.C. high voltage transmissions etc., economy and validity can be lifted effectively.
Realized that the general principle of sub-synchronous oscillation was using the program in the past：Passed through using synchronous generator speed error signal
Cross after certain processing and produce the reference value of current control loop, subsynchronous band current is injected to unit, in synchronous generator
Certain electrical damping is produced on rotor and reaches the purpose for suppressing sub-synchronous oscillation.Optimization is used as using synchronous generator tach signal
The input of control, and the collection of synchronous generator rotating speed is slower in itself, the effect of inertia of each mass of synchronous generator causes in addition
Tach signal can not reflect the generation of system sub-synchronous oscillation in time, cause sub-synchronous oscillation suppression to play a role relatively stagnant
Afterwards, at the time of subsynchronous suppressor functions to, sub-synchronous oscillation is comparatively serious, and the performance of suppressor can be beaten greatly
Discount；Also there are the means that Rotating speed measring is replaced based on electric measurement simultaneously, by electrical measurement signal and corresponding digital control
Device algorithm, the extraction to synchronous generator tach signal is realized, the passage of subsynchronous suppression electric current is used as by idle passage, or
It is used as the passage of subsynchronous suppression electric current by active reactive binary channels, the program can be very good to realize the subsynchronous suppression of dynamic
Effect, but the program needs to propose certain demand for the capacity of equipment or the capacity of dc-link capacitance.
In summary, there is following technical problem in the method for existing synchronous generator sub-synchronous oscillation：Synchronous generator turns
Fast feedback error and hysteresis are serious, can not timely and effectively put into synchronous generator sub-synchronous oscillation suppressor；Using without power control
The optimal controller of branch road processed or the double branch roads of active reactive control, the sub-synchronous oscillation in the case where realizing all operating modes of synchronous generator
Effective suppression, the capacity of device self-capacity or dc-link capacitance needs to be correspondingly improved, and adds cost and volume.
The content of the invention
The defects of for prior art, the invention provides a kind of synchronous generator based on the optimization of grid-connection converter phaselocked loop
The subsynchronous suppressing method of machine, while its object is to not increase power system capacity, coordinate active reactive controlling brancher, increase suppresses
The inhibition of synchronous generator sub-synchronous oscillation, improve existing sub-synchronous oscillation suppression method and suppressing the energy of sub-synchronous oscillation
Power；Aim to solve the problem that causes synchronous generator time same because the speed feedback error and hysteresis of synchronous generator are serious in the prior art
The problem of walking the inhibition difference of vibration.
The invention provides a kind of subsynchronous suppressing method of synchronous generator based on the optimization of grid-connection converter phaselocked loop, bag
Include following step：
S1：Gather grid-connection converter electric signal amount；
S2：Synchronous rotary signal delta θ is obtained according to the grid-connection converter electric signal amount, to the synchronous rotary signal
Judge whether synchronous generator occurs sub-synchronous oscillation after Δ θ progress bandpass filtering treatments and according to the result of processing, if so, then
Into step S3, if it is not, then the bandwidth of grid-connection converter phaselocked loop is constant；
S3：The damping of AC system is lifted by increasing the bandwidth of phaselocked loop, and the damping after lifting is injected into friendship
The suppression of sub-synchronous oscillation is realized in streaming system.
Further, in step sl, grid-connection converter electric signal amount includes grid-connection converter PCC point three-phase alternating currents
Voltage VPCC, three-phase alternating current IPCCWith DC capacitor voltage Udc。
Further, in step s 2, to the grid-connection converter three-phase alternating voltage VPCCObtained after carrying out PARK conversion
Obtain three-phase alternating voltage active component u under rotating coordinate systemd, the synchronous rotary signal delta θ is equal under the rotating coordinate system
Three-phase alternating voltage active component ud。
Further, in step s 2, when the result after bandpass filtering treatment is zero, synchronous generator does not occur
Sub-synchronous oscillation；When the result after bandpass filtering treatment is not zero, there occurs sub-synchronous oscillation for synchronous generator.
Further, in step s 2, the synchronous rotary signal delta θ is put by bandpass filtering treatment and gain successively
Bandwidth of phase lock loop Dynamic gene m is obtained after big.
Further, in step s3, carried according to the bandwidth of bandwidth of phase lock loop Dynamic gene m increase phaselocked loops
Rise the damping of AC system.
Further, the cut-off frequency of the bandpass filter used in the bandpass filtering treatment is 5Hz-50Hz.
Compared with immediate prior art, the beneficial effects of the invention are as follows：
(1) present invention adds grid-connection converter only by changing the governing speed of grid-connection converter pll controller
Sub-synchronous oscillation rejection ability, coordinate original active reactive controlling brancher, reduce to grid-connection converter capacity or device
The demand of part.
(2) present invention can realize occurs disturbance initial time in synchronous rotary signal, proceeds by sub-synchronous oscillation, phase
Than the Restrain measurement fed back in other by tach signal, faster, operation is more convenient, reduces the need to communication for speed
Ask.
(3) present invention only requires the electrical quantity of the voltage and current of measurement grid-connection converter PCC points, phase lock control is passed through
Device, realize to synchronous rotary signal, it is more ripe on existing digital sampling techniques, and sample more accurate.
(4) present invention mainly carries out the increase of subsynchronous damping according to grid-connection converter electric signal amount in itself, can be with
It is easily scalable in other same type of transverters, and the upgrading of device need not be carried out to existing transverter,
The optimal control to adding phaselocked loop in controller is only needed, control is realized simply, is easy to extend.
Brief description of the drawings
Fig. 1 is the synchronous generator subsynchronous suppression provided in an embodiment of the present invention based on the optimization of grid-connection converter phaselocked loop
The implementation process figure of method；
Fig. 2 is the synchronous generator subsynchronous suppression provided in an embodiment of the present invention based on the optimization of grid-connection converter phaselocked loop
The structural representation of system；
Fig. 3 is the schematic diagram of phaselocked loop optimal controller provided in an embodiment of the present invention.
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 invention provides it is a kind of based on grid-connection converter phaselocked loop optimization the subsynchronous suppressing method of synchronous generator,
While not increasing power system capacity, coordinate active reactive controlling brancher, increase suppresses the suppression of synchronous generator sub-synchronous oscillation
Effect, existing sub-synchronous oscillation suppression method can be improved and suppressing the ability of sub-synchronous oscillation.
Fig. 1 shows that the synchronous generator provided in an embodiment of the present invention based on the optimization of grid-connection converter phaselocked loop is subsynchronous
The implementation process of suppressing method, for convenience of description, the part related to the embodiment of the present invention is illustrate only, details are as follows：
The subsynchronous suppressing method of synchronous generator provided by the invention is applied to realize synchronous generator in grid-connection converter
Subsynchronous suppressing method, comprises the steps：
Step 1：Gather grid-connection converter PCC point three-phase alternating voltages VPCC, three-phase alternating current IPCC, DC bus capacitor electricity
Press Udc。
Step 2：To three-phase alternating voltage VPCCPARK conversion is carried out, it is active to obtain three-phase alternating voltage under rotating coordinate system
Component udWith voltage power-less component uq。
Step 3：Three-phase alternating voltage active component u under rotating coordinate systemdSynchronous rotary signal delta θ is approximately equal to, it is synchronous
Rotating signal Δ θ is through phaselocked loop PI controllersAnd integral controllerVoltage lock phase phase angle theta is obtained, i.e.,Wherein kpAnd kiFor phaselocked loop PI controller parameters, m adjusts for optimal controller output bandwidth
The factor.
Further, step 3 includes：Synchronous rotary signal delta θ is as input signal, successively by bandpass filter,
The optimal controller that gain amplifier is formed, obtained signal are the bandwidth of phase lock loop Dynamic gene for suppressing sub-synchronous oscillation
M, by increasing the bandwidth of pll controller, the damping of the subsynchronous frequency range of grid-connection converter AC output is added, from
And the vibration for suppressing the subsynchronous frequency range of synchronous generator in the AC system is realized, wherein, Design of Bandpass is in 5Hz-
Between 50Hz.
Step 4：To grid-connection converter three-phase alternating current IPCCPARK conversion is carried out, it is intersecting to obtain under rotating coordinate system three
Flow active component of current idWith reactive component of current iq。
Step 5：The active outer shroud of grid-connection converter master controller may be selected to determine DC bus-bar voltage control and determine active power
Control, output watt current instruction idref。
Further, step 5 specifically includes：When situation of the DC bus-bar voltage without other equipment progress stability contorting
Under, the active outer shroud selection constant DC voltage control of grid-connection converter master controller, carry out stable DC busbar voltage, direct current is female
Line voltage reference value UdcrefWith DC bus-bar voltage measured value UdcIt is poor to make, through DC voltage PI controllersHad
Work(current-order idref1, i.e.,Wherein kp1And ki1For DC voltage PI controller parameters,
DC bus-bar voltage reference value Udcref1 is set under perunit system.
In the case that DC bus-bar voltage has other equipment to carry out stability contorting, the grid-connection converter master controller has
Active power controller, active power reference value P are determined in the selection of work(outer shroudrefIt is poor to make with active power actual value P, through active-power P I
ControllerObtain watt current instruction idref2, i.e.,Wherein kp2And ki2To be active
Power P I controller parameters, active power reference value PrefUnder perunit system between (- 1,1), active power actual value P etc.
In udid+uqiq。
Step 6：Grid-connection converter master controller is idle, and outer shroud may be selected to determine Reactive Power Control and determine alternating voltage control,
Export referenced reactive current value iqref。
Further, step 6 specifically includes：When alternating voltage needs the situation of grid-connection converter progress stability contorting
Under, grid-connection converter master controller is idle, and outer shroud selection determines alternating voltage to stablize AC voltage, alternating voltage amplitude reference
Value UrefIt is poor to make with alternating voltage amplitude actual value U, through alternating voltage PI controllersObtain referenced reactive current
iqref1, i.e.,Wherein kp3And ki3For alternating voltage PI controller parameters, alternating voltage reference
Value Uref1 is set under perunit system, alternating voltage actual value U is equal to ud。
In the case that alternating voltage does not need grid-connection converter to carry out stability contorting, grid-connection converter master controller is idle
Reactive Power Control, reactive power reference qref Q are determined in outer shroud selectionrefIt is poor to make with reactive power actual value Q, is controlled through reactive power PI
Device processedObtain referenced reactive current iqref2, i.e.,Wherein kp4And ki4For idle work(
Rate PI controller parameters, reactive power reference qref QrefUnder perunit system between (- 1,1), absolute value is less thanNothing
Work(power actual value Q is equal to uqid-udiq。
Step 7：The active power command value i that step 5 is obtaineddrefThe active component of current obtained with step 4 is real
Actual value idIt is poor to make, through watt current PI controllersObtain transverter Inner potential active components Ed, i.e.,Wherein kp5And ki5For watt current PI controller parameters.
Step 8：The reactive power command value i that step 6 is obtainedqrefThe reactive component of current obtained with step 4 is real
Actual value iqIt is poor to make, through reactive current PI controllersObtain transverter Inner potential reactive components Eq, i.e.,Wherein kp6And ki6For reactive current PI controller parameters.
Step 9：To step 7, the 8 transverter Inner potential active components EdWith reactive component EqPARK inverse transformations are carried out, are obtained
To three-phase alternating current Inner potentials eabc, for producing pwm signal driving current transformer.Will be excellent by step 3 pll controller so as to realize
Change increased electrical system damping to be injected into AC system, realize the suppression for carrying out sub-synchronous oscillation initial stage in sub-synchronous oscillation
System.
The present invention relates to it is a kind of based on grid-connection converter phaselocked loop optimization the subsynchronous suppressing method of synchronous generator, more
In particular it relates to utilize grid-connection converter PCC electric signals to one kind, by the optimal control of pll controller, realize simultaneously
The improved method of net transformation device damping characteristic.
Compared with the Restrain measurement of legacy system sub-synchronous oscillation, present invention only requires measurement grid-connection converter PCC points
The electrical quantity of voltage and current, by pll controller, realize to synchronous rotary signal, on existing digital sampling techniques more
For maturation, and sample more accurate.The present invention adds only by changing the governing speed of grid-connection converter pll controller
The rejection ability of the subsynchronous damping of grid-connection converter, coordinate original active reactive controlling brancher, reduce pair and net transformation
The demand of device capacity or device.The present invention can realize occurs disturbance initial time in synchronous rotary signal, proceeds by secondary same
Step vibration, compared to the Restrain measurement that other are fed back by tach signal, faster, operation is more convenient, reduces for speed
To the demand of communication.The present invention mainly carries out the increase of subsynchronous damping according to the electric signal amount of grid-connection converter in itself, can
To be easily scalable in other same type of transverters, and the upgrading that device need not be carried out to existing transverter changes
Make, it is only necessary to which the optimal control to adding phaselocked loop in controller, control is realized simply, is easy to extend.
For the further description synchronous hair provided in an embodiment of the present invention based on the optimization of grid-connection converter phaselocked loop
The subsynchronous suppressing method of motor, in conjunction with accompanying drawing, and select determine the active outer ring controller of DC voltage and to determine reactive power idle
Exemplified by outer ring controller, illustrate the synchronous generator subsynchronous suppression proposed by the present invention based on the optimization of grid-connection converter phaselocked loop
The application of method.
Fig. 2 is the structural representation of the subsynchronous suppression system of synchronous generator based on the optimization of grid-connection converter phaselocked loop：1
Grid-connection converter is represented, is that optimal controller of the present invention place is equipped, is connected to the low-pressure side of main transformer；Wherein 11 be voltage
Measurement apparatus, for measuring grid-connection converter port PCC point voltages, prepared for extraction synchronous rotary signal and lock phase angle；12
For current measuring device, for measuring grid-connection converter output current；13 be grid-connection converter main circuit topology, and the topology can be with
It is the multi-level voltage source type transverter such as two level VSC transverters or MMC；2 represent main transformer, for connecting simultaneously
Net transformation device and system side, low-pressure side connection grid-connection converter, high-pressure side connection external system；3 represent outside grid-connection converter
System, the inside include the power-supply devices such as synchronous generator；4 represent apparatus of the present invention, and grid-connected change is detected by measurement apparatus 11,12
The electrical component of parallel operation port, voltage phase signal θ is obtained through pll controller 45, and by 41,42 coordinate transformation devices,
Three-phase voltage signal is transformed under synchronous rotating frame, obtains component of voltage u under synchronous rotating framed、uq, by 43,
44 coordinate transformation devices, three-phase current signal is transformed under synchronous rotating frame, obtains electric current under synchronous rotating frame
Component id、iq；Phase control device 45 is wherein locked by lock phase PI controllers 452, lock phase integral controller 451 and lock phase optimal controller
453 are formed, and lock phase PI controllers 452 by optimal controller 453, regulation by the synchronously rotating reference frame signal according to phaselocked loop
Bandwidth, realize the improvement of grid-connection converter system damping；5 represent the main control loop of grid-connection converter, wherein active outer shroud
Constant DC voltage control device can be selected and determine Active Power Controller, the present invention by taking constant DC voltage control device as an example for
Bright, dc voltage measurements and direct voltage reference value obtain inner ring watt current controller reference value by PI controllers 51,
Idle outer ring controller can first select to determine alternating voltage and determine reactive power controller, and the present invention is to determine reactive power controller
Exemplified by illustrate, wattless power measurement value and reactive power reference qref obtain inner ring reactive current control by PI controllers 53
Device reference value, master controller inner ring current controller controls obtained reference value according to foregoing outer shroud and actual value is controlled by PI
Device 52,54, obtain component E under built-in potential synchronous rotating framed、Eq, and modulation institute is obtained by coordinate contravariant changer controller 55
The three-phase alternating voltage signal e neededabc, and the switching signal for controlling full-controlled switch device is produced by PWM module 56, make this
The current signal that device output needs.
Specific implementation step is as follows：
As Figure 1-3, the subsynchronous suppressing method master of synchronous generator based on the optimization of grid-connection converter phaselocked loop
The step is wanted to be：
S1：Gather grid-connection converter electric signal amount；
Grid-connection converter output electric signal amount includes PCC points voltage Vpcc, output current Ipcc, wherein it is possible to using
Voltage measuring apparatus 11 measures grid-connection converter PCC point voltage signals, can be measured using current measuring device 12 grid-connected
Converter output current.
S2：Grid-connection converter phaselocked loop optimal controller parameter designing；
The electric signal amount obtained by step S1, by the first coordinate transformation unit 41 and the second coordinate transformation unit 42
After obtain Δ θ, by Δ θ by obtaining PCC point voltage phase angle θ after PI controllers 452 and integral controller 451, meanwhile, in the warp
Allusion quotation lock phase on add lock phase optimal controller, by Δ θ by lock phase optimal controller obtain pll controller Bandwidth adjustment because
Sub- m, and by the proportional action into phaselocked loop PI controllers, by phaselocked loop regulating system damping characteristic, realize and sent out in system
Raw sub-synchronous oscillation carries out effective suppression of sub-synchronous oscillation initial stage.
S3：Grid-connection converter master controller designs；
The main control loop of grid-connection converter is module 5, wherein active outer shroud can select constant DC voltage control device
With determine Active Power Controller, the present invention illustrates by taking constant DC voltage control device as an example, dc voltage measurements and direct current
Reference value is pressed to obtain inner ring watt current controller reference value, idle outer ring controller can be selected first by PI controllers 51
Determine alternating voltage and determine reactive power controller, the present invention is illustrated exemplified by determining reactive power controller, wattless power measurement
Value and reactive power reference qref obtain inner ring reactive current control device reference value, master controller inner ring electricity by PI controllers 53
Stream controller controls obtained reference value and actual value by PI controllers 52,54 according to foregoing outer shroud, obtains built-in potential synchronization
Component E under rotating coordinate systemd、Eq, and obtain by coordinate contravariant changer controller 55 modulating required three-phase alternating voltage signal
eabc, and the switching signal for controlling full-controlled switch device is produced by PWM module 56, make the electric current letter of device output needs
Number.
As shown in figure 3, Δ θ passes through after bandpass filter, if the output result of bandpass filter is zero, m 1,
In the case that the output result of bandpass filter is not zero, m proportional increases on the basis of 1.
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, not to
The limitation present invention, all any modification, equivalent and improvement made within the spirit and principles of the invention etc., all should be included
Within protection scope of the present invention.
Claims (7)
- A kind of 1. subsynchronous suppressing method of synchronous generator based on the optimization of grid-connection converter phaselocked loop, it is characterised in that including Following step：S1：Gather grid-connection converter electric signal amount；S2：Synchronous rotary signal delta θ is obtained according to the grid-connection converter electric signal amount, to the synchronous rotary signal delta θ Judge whether synchronous generator occurs sub-synchronous oscillation after progress bandpass filtering treatment and according to the result of processing, if so, then entering Enter step S3, if it is not, then the bandwidth of grid-connection converter phaselocked loop is constant；S3：The damping of AC system is lifted by increasing the bandwidth of phaselocked loop, and the damping after lifting is injected into exchange system The suppression of sub-synchronous oscillation is realized in system.
- 2. the subsynchronous suppressing method of synchronous generator as claimed in claim 1, it is characterised in that in step sl, grid-connected change Parallel operation electric signal amount includes grid-connection converter PCC point three-phase alternating voltages VPCC, three-phase alternating current IPCCAnd DC bus capacitor Voltage Udc。
- 3. the subsynchronous suppressing method of synchronous generator as claimed in claim 1 or 2, it is characterised in that in step s 2, to institute State grid-connection converter three-phase alternating voltage VPCCThree-phase alternating voltage active component under rotating coordinate system is obtained after carrying out PARK conversion ud, the synchronous rotary signal delta θ is equal to three-phase alternating voltage active component u under the rotating coordinate systemd。
- 4. the subsynchronous suppressing method of synchronous generator as described in claim any one of 1-3, it is characterised in that in step S2 In, when the result after bandpass filtering treatment is zero, sub-synchronous oscillation does not occur for synchronous generator；After bandpass filtering treatment Result when being not zero, there occurs sub-synchronous oscillation for synchronous generator.
- 5. the subsynchronous suppressing method of synchronous generator as described in claim any one of 1-4, it is characterised in that in step S2 In, the synchronous rotary signal delta θ obtains bandwidth of phase lock loop Dynamic gene after bandpass filtering treatment and gain amplification successively m。
- 6. the subsynchronous suppressing method of synchronous generator as claimed in claim 5, it is characterised in that in step s3, according to institute The bandwidth for stating bandwidth of phase lock loop Dynamic gene m increase phaselocked loop lifts the damping of AC system.
- 7. the subsynchronous suppressing method of synchronous generator as claimed in claim 5, it is characterised in that in the bandpass filtering treatment The cut-off frequency of the bandpass filter used is 5Hz-50Hz.
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| CN110350551A (en) * | 2019-06-11 | 2019-10-18 | 华中科技大学 | A kind of direct amplitude-frequency control method and system of grid-connected converting means electric current of voltage-source type |
| CN111668856A (en) * | 2020-03-31 | 2020-09-15 | 中国南方电网有限责任公司 | Current control-based high-frequency oscillation suppression method and system for flexible direct current transmission system |
| CN112838601A (en) * | 2021-03-04 | 2021-05-25 | 华中科技大学 | Phase-locked optimization-based high-frequency oscillation suppression method and system for flexible direct power transmission system |
| CN113013898A (en) * | 2021-03-17 | 2021-06-22 | 江苏国科智能电气有限公司 | Grid-connected inverter subsynchronous oscillation suppression method based on far-end power grid phase locking |
| CN113162117A (en) * | 2021-05-12 | 2021-07-23 | 合肥工业大学 | Method for designing bandwidth of grid-connected inverter controller under weak grid |
| CN114759581A (en) * | 2022-05-27 | 2022-07-15 | 上海交通大学 | Wind power soft direct-sending sub-synchronous oscillation suppression method and system based on energy control |
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| CN112838601A (en) * | 2021-03-04 | 2021-05-25 | 华中科技大学 | Phase-locked optimization-based high-frequency oscillation suppression method and system for flexible direct power transmission system |
| CN112838601B (en) * | 2021-03-04 | 2022-10-14 | 华中科技大学 | Phase-locked optimization-based high-frequency oscillation suppression method and system for flexible direct power transmission system |
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| CN114759581A (en) * | 2022-05-27 | 2022-07-15 | 上海交通大学 | Wind power soft direct-sending sub-synchronous oscillation suppression method and system based on energy control |
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