CN110212546A - Inhibit torsional oscillation generator terminal STATCOM output current control method and controller - Google Patents
Inhibit torsional oscillation generator terminal STATCOM output current control method and controller Download PDFInfo
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- CN110212546A CN110212546A CN201910249771.7A CN201910249771A CN110212546A CN 110212546 A CN110212546 A CN 110212546A CN 201910249771 A CN201910249771 A CN 201910249771A CN 110212546 A CN110212546 A CN 110212546A
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
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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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
Abstract
A kind of generator terminal STATCOM output current control method inhibiting torsional oscillation, including power current compensation calculation link, semaphore measurement links, mode current compensation calculate link, current control inner ring link, DC voltage control outer ring link, pulse generation link；First calculate power current offset, Model control value, DC current offset, three is obtained into modulating wave voltage reference value through the PIR controller of excess current control inner ring again, trigger pulse is generated finally by pulse generation module, control the on-off of IGBT in STATCOM, subsynchronous/supersynchronous electric current required for generating, it is injected into generator unit stator winding, generates the electromagnetic torque for inhibiting torsional oscillation.The present invention also accordingly proposes a kind of generator terminal STATCOM controller for inhibiting torsional oscillation.This programme makes STATCOM not be only involved in the adjusting of fundamental frequency reactive current, and improves original PR controller characteristic, improves torsional oscillation inhibitory effect, easy to implement.
Description
Technical field
The invention belongs to the control technology field of electric system power electronics equipment more particularly to a kind of machines for inhibiting torsional oscillation
Hold STATCOM output current control method and controller.
Background technique
When large turbo-type generator group power is sent out, if using point to the long distance powedr transmission mode of net, in order to improve
Transmission power, power grid use capacitor string to mend sometimes, use D.C. high voltage transmission sometimes.It is theoretical and practice have shown that, this kind of transmission of electricity mould
Formula easily causes power grid sub-synchronous oscillation and shafting torsional vibration of turbo-generator set.When sub-synchronous oscillation occurs in power grid, in the interaction of machine net
Under the action of, each rotor of steam-electric generating set shafting includes steam turbine high pressure cylinder rotor, intermediate pressure cylinder rotor, low pressure (LP) cylinder rotor, power generation
The phenomenon of torsional vibration of mutual torsionoscillation is likely to occur between machine rotor, exciter rotor.The harm of sub-synchronous oscillation and torsional oscillation is very
Greatly, the safety and stability of power grid is not only influenced, it is also possible to cause the fatigue damage of steam-electric generating set shafting, reduce unit and use the longevity
Life, it is cracked to even result in big axis when serious, brings about great losses.Such as in the 1970s, because of the electricity on transmission line of electricity
Hold string and mend failure, Mohave power plant, the U.S. recurs serious torsional oscillation accident twice, and shafting is caused to damage；2000
Later, 2 units of power plant, China, it is same because of long-time torsional oscillation, cause the low pressure (LP) cylinder rotor of generating set and generator to turn
Shaft coupling between son is cracked.These accidents cause heavy losses.In addition, power system oscillation event also table in recent years
Bright, large-scale wind power can also cause power grid subsynchronous or supersynchronous oscillation, lead to the torsional oscillation of neighbouring thermal power plant's Turbo-generator Set.
For the safe operation for ensureing Turbo-generator Set, to there are the power plant of sub-synchronous oscillation and torsional oscillation risk, there are many
Technological means realizes that torsional oscillation inhibits.Such as:
(1) using static block filter (Static Block Filter, SBF), this method is in main transformer neutrality
Point side concatenates the passive filtering circuit being made of reactor, capacitor, blocks specific subsynchronous harmonic wave；
(2) supplementary excitation damping control (SEDC) is used, injection is specific secondary same in party's normal direction generator excitation winding
Mode electric current is walked, generator is made to generate the electromagnetic torque for offsetting torsional oscillation；
(3) Static Var Compensator (SVC) is used, this method is in main transformer high-pressure side or in main transformer low-pressure side
The reactor TCR controlled based on thyristor is mounted in generator generator terminal, is opened and is turned off by controlling thyristor, Xiang Fa electricity
Specific subsynchronous/supersynchronous mode electric current is injected in machine stator winding, generates the electromagnetic torque for offsetting torsional oscillation；
(4) static synchronous compensator (STATCOM) is used, this method is in generator house transformer low-pressure side, Huo Zhe
Factory becomes high-pressure side i.e. in generator generator terminal, or installs STATCOM in main transformer high-pressure side, by control STATCOM
The on-off of IGBT injects specific subsynchronous/supersynchronous mode electric current into generator unit stator winding, generates the electricity for offsetting torsional oscillation
Magnetic torque.
Above-mentioned several method has respective advantage and disadvantage, and wherein method (4) is referred to as " generator terminal STATCOM ", and this method uses
Full-control type power device IGBT, more more flexible than SVC scheme in control, and rated capacity can be designed according to requirement of engineering, no
As SEDC scheme can be limited by excitation system capacity, also the cost unlike SBF scheme is very high, therefore is taken seriously.
It is currently used in the generator terminal STATCOM of torsional oscillation inhibition, only specific subsynchronous/supersynchronous mode electric current output is carried out
Control, basic skills is that the rotational speed omega of the big axis of generating set is measured by speed probe, by multi-modal filtering processing, and
Amplitude, the phase of each modal components are adjusted, obtain comprehensive current controling signal, then obtain by closed-loop current control
To pulsewidth modulation (PWM), subsynchronous/supersynchronous mode electric current needed for controlling STATCOM output.Due to being currently used in torsional oscillation suppression
The generator terminal STATCOM of system does not consider that fundamental frequency reactive current is adjusted, only considers maximum to shaft system of unit harm specific solid
There is the inhibition of torsional oscillation mode frequency.Therefore, when network system is there is no subsynchronous/supersynchronous oscillation, but low frequency vibration occurs
When the disturbance situation such as swinging, the STATCOM of this method is in approximate idle running state, is not involved in fundamental frequency reactive current tune
Section does not play potential ability and power grid Ability of Resisting Disturbance that STATCOM improves the stabilization of power grids.Mitigate disturbance, it can be certain
The torsional oscillation of degree alleviation Turbo-generator Set.
In addition, routine STATCOM is passed through frequently with ratio resonant controller, that is, PR controller, it is well known that, PR control
Resonant controller, that is, R controller in device is usually that power frequency has preferable gain to control, therefore R is controlled just for the Frequency point of setting
Device processed cannot control effectively for subsynchronous/supersynchronous oscillating component of wider range；Subsynchronous/supersynchronous oscillating component
Control rely only on the proportional controller P controller in PR controller, this is droop control, when PR being caused to control
STATCOM inhibits the ineffective of shafting torsional oscillation.
Summary of the invention
The purpose of the present invention is: propose a kind of generator terminal STATCOM output current control method and controller for inhibiting torsional oscillation,
It solves the problems, such as that the STATCOM for being currently used for torsional oscillation inhibition is not involved in the adjusting of fundamental frequency reactive current, improves in controlling unit
The problem for inhibiting shafting torsional oscillation ineffective of ratio resonant controller.
To achieve the goals above, the technical solution adopted by the present invention is that:
A kind of generator terminal STATCOM output current control method inhibiting torsional oscillation, is added work in the control of generator terminal STATCOM
Frequency current compensation calculates link, and the power current compensation calculation link gives reference value according to reactive power and power frequency is calculated
Current offset values under the action of the power current offset is through excess current control inner ring link, participate in modulating wave Voltage Reference
The calculating of value.
Further, the above method further include: semaphore measurement links, mode current compensation calculate link, current control
Inner ring link, DC voltage control outer ring link, pulse generate link；The power frequency electric obtained by power current compensation calculation link
Offset is flowed, the Model control value that link obtains is calculated by mode current compensation, is obtained by DC voltage control outer ring link
DC current offset, three obtain modulating wave voltage reference value, finally by arteries and veins under the action of current control inner ring link
Punching generates link and generates trigger pulse, controls the on-off of IGBT in STATCOM, subsynchronous/supersynchronous electric current required for generating,
It is injected into generator unit stator winding, generates the electromagnetic torque for inhibiting torsional oscillation.
Further, in the above method, the semaphore measurement links, function is measurement Turbo-generator Set revolving speed
ω, generator terminal voltage ug, generator generator terminal electric current ig, STATCOM export electric current is, STATCOM DC voltage udc；Its
In, ω is the revolving speed of Turbo-generator Set steam turbine side or generator side rotor, ugIt is generator three-phase phase voltage or triple line electricity
Pressure, igIt is generator three-phase current, isIt is the three-phase current of STATCOM output, udcIt is the three-phase voltage of STATCOM DC side.
Further, in the above method, reactive power gives reference value Q*By power current compensation calculation link, calculate
Obtain power current offsetPower current compensation calculation link is calculated using open loop, first by generator terminal voltage ugPass through
Dq0 converts to obtain d axis component ud, then use Q*Divided by ud, obtain required
Further, in the above method, Turbo-generator Set rotational speed omega calculates link by mode current compensation, calculates
To each Model control value Δ λj, subscript j=1,2,3 ..., N, N indicate that Turbo-generator Set has N number of intrinsic subsynchronous oscillation
Mode；The method that mode current compensation calculates is to change rotational speed omega mark, isolates each torsional oscillation mode by bandpass filter
Amount, by respective ratio enlargement, phase shift, obtains each Model control value Δ λj, j=1,2,3 ..., N.
Further, in the above method, direct voltage reference valueSTATCOM DC voltage udcBy DC voltage
Outer ring link is controlled, DC current offset is calculatedIt is the DC current offset of three-phase, specifically by as follows
Formula calculates:
Wherein, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, C33(θa) be one 3 ×
3 diagonal matrix, C33(θa)=diag (cos (θa)cos(θa-2π/3)cos(θa+ 2 π/3)),It is proportional integration
Transmission function, KP1It is proportionality coefficient, KI1It is integral coefficient.
Further, in the above method, electric current i is exported according to the STATCOM that semaphore measurement links obtains, power frequency electric
Flow the power current offset of compensation calculation link outputMode current compensation calculates the Model control value Δ of link output
λj, DC voltage control outer ring link output DC current offsetThrough excess current control inner ring link, tune is calculated
Wave voltage reference value u processedref；The calculating step of current control inner ring link includes:
(1) mode current control value first is calculated using following formula
(2) current control deviation Δ i is calculated using following formula agains:
(3) last Δ isBy transfer function H (s), modulating wave voltage reference value u is obtainedref:
uref=H (s) Δ isFormula 4
C in formula 213(θj) and C13(θ0) be all 3 × 1 matrix, be respectively as follows:
C13(θj)=- [sin (θj)sin(θj-2π/3)sin(θj+2π/3)]T,
C13(θ0)=- [sin (θ0)sin(θ0-2π/3)sin(θ0+2π/3)]T,
Wherein θj=θa+σj, θ0=θa, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated,
σjIt is the compensation phase of j-th of mode of setting, subscript j=1, it is N number of intrinsic that 2,3 ..., N, N indicate that Turbo-generator Set has
Subsynchronous oscillation mode；Formula 2 is converted into the mode electric current of three-phase after being superimposed Model control signal with power current offset
Controlling value is *。
Further, in the above method, the calculating step (3) of the current control inner ring link, transfer function H (s) is adopted
With proportional integration resonant regulator form, it is shown below:
Wherein, KPIt is proportionality coefficient, KIIt is integral coefficient, KRIt is resonance coefficient, ζ is resonance damped coefficient, ω0It is power frequency
Angular frequency.
Further, in the above method, the pulse generates link and approaches modulation using nearest level, or using load
Wave phase-shift pulse width modulated.
Further, in the above method, the ontology of the STATCOM uses star-star connection mode, or is connect using triangle
Line mode.
The present invention proposes a kind of generator terminal STATCOM controller for inhibiting torsional oscillation simultaneously, and the controller includes power current
Compensation calculation module and current control inner loop module, the power current compensation calculation module give reference value according to reactive power
Power current offset is calculated, the power current offset input current control inner loop module participates in modulation wave voltage ginseng
Examine the calculating of value.
Further, above controller further includes semaphore measurement module, mode current compensation computing module, DC voltage
Control outer loop module, pulse generation module；The power current offset obtained by power current compensation calculation module, by mode electricity
The Model control value that stream compensation calculation module obtains, the DC current offset obtained by DC voltage control outer loop module, three
Person obtains modulating wave voltage reference value under the action of current control inner loop module, generates and touches finally by pulse generation module
Pulse is sent out, the on-off of IGBT in STATCOM is controlled, subsynchronous/supersynchronous electric current required for generating is injected into generator unit stator
Winding generates the electromagnetic torque for inhibiting torsional oscillation.
Further, in above controller, the semaphore measurement module, function is that measurement Turbo-generator Set turns
Fast ω, generator terminal voltage ug, generator generator terminal electric current ig, STATCOM export electric current is, STATCOM DC voltage udc；
Wherein, ω is the revolving speed of Turbo-generator Set steam turbine side or generator side rotor, ugIt is generator three-phase phase voltage or triple line
Voltage, igIt is generator three-phase current, isIt is the three-phase current of STATCOM output, udcIt is the three-phase electricity of STATCOM DC side
Pressure.
Further, in above controller, reactive power gives reference value Q*By power current compensation calculation module, meter
Calculation obtains power current offsetPower current compensation calculation module is calculated using open loop, first by generator terminal voltage ug
It converts to obtain d axis component u by dq0d, then use Q*Divided by ud, obtain required
Further, in above controller, Turbo-generator Set rotational speed omega passes through mode current compensation computing module, calculates
Obtain each Model control value Δ λj, subscript j=1,2,3 ..., N, N indicate that Turbo-generator Set has N number of intrinsic subsynchronous torsion
Vibration mode；The method that mode current compensation calculates is to change rotational speed omega mark, isolates each torsional oscillation mould by bandpass filter
State amount obtains each Model control value Δ λ by respective ratio enlargement, phase shiftj, j=1,2,3 ..., N.
Further, in above controller, direct voltage reference valueSTATCOM DC voltage udcBy direct current
Voltage-controlled outer loop module processed, is calculated DC current offsetIt is the DC current offset of three-phase, specifically by such as
Lower formula calculates:
Wherein, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, C33(θa) be one 3 ×
3 diagonal matrix, C33(θa)=diag (cos (θa)cos(θa-2π/3)cos(θa+ 2 π/3)),It is proportional integration
Transmission function, KP1It is proportionality coefficient, KI1It is integral coefficient.
Further, in above controller, electric current i is exported according to the STATCOM that semaphore measurement module obtainss, power frequency
The power current offset of current compensation computing module outputThe Model control value Δ of mode current compensation computing module output
λj, DC voltage control outer loop module output DC current offsetThrough excess current control inner loop module, tune is calculated
Wave voltage reference value u processedref；Current control inner loop module includes following submodule:
(1) mode current control value computational submodule, for mode current control value to be calculated according to following formula
(2) current control deviation computational submodule, for current control deviation Δ to be calculated according to following formula
is:
(3) modulating wave voltage reference value computational submodule, for according to Δ isBy transfer function H (s), modulating wave is obtained
Voltage reference value uref:
uref=H (s) Δ isFormula 4
C in formula 213(θj) and C13(θ0) be all 3 × 1 matrix, be respectively as follows:
C13(θj)=- [sin (θj)sin(θj-2π/3)sin(θj+2π/3)]T,
C13(θ0)=- [sin (θ0)sin(θ0-2π/3)sin(θ0+2π/3)]T,
Wherein θj=θa+σj, θ0=θa, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated,
σjIt is the compensation phase of j-th of mode of setting, subscript j=1, it is N number of intrinsic that 2,3 ..., N, N indicate that Turbo-generator Set has
Subsynchronous oscillation mode；Formula 2 is converted into the mode electric current of three-phase after being superimposed Model control signal with power current offset
Controlling value
Further, the transfer function H (s) in above controller, in the modulating wave voltage reference value computational submodule
Using proportional integration resonant regulator form, it is shown below:
Wherein, KPIt is proportionality coefficient, KIIt is integral coefficient, KRIt is resonance coefficient, ζ is resonance damped coefficient, ω0It is power frequency
Angular frequency.
Further, in above controller, the pulse generation module approaches modulation using nearest level, or uses
The modulation of phase-shifting carrier wave pulse width.
Further, in above controller, the ontology of the STATCOM uses star-star connection mode, or uses triangle
The mode of connection.
The beneficial effects of the present invention are: (1) increases power current compensating module, generator terminal STATCOM is set to participate in power frequency idle
The adjusting of electric current improves grid stability, mitigates grid disturbance, alleviates the torsional oscillation of Turbo-generator Set；(2) it is controlled in STATCOM
In link processed, use ratio integral resonance controller, that is, PIR controller not only ensure that the gain control of output power current,
And the output of the high-gain in wider frequency range is realized, so that the control of subsynchronous/supersynchronous oscillating component is become indifference control
System improves the effect that torsional oscillation inhibits.
Detailed description of the invention
Fig. 1 is the method for the present invention electrical apparatus interstar connection schematic diagram；
Fig. 2 is the acquisition of the method for the present invention external signal and internal calculation link relation schematic diagram；
Fig. 3 is the method for the present invention internal computing methods schematic diagram；
Fig. 4 is that the method for the present invention PIR inside modules calculate schematic diagram；
Fig. 5 is in the specific embodiment of the invention, and in the case of the disturbance of network system phase fault, Turbo-generator Set is each
Mode revolving speed inhibitory effect schematic diagram；
Fig. 6 is the external signal acquisition and house calculation module relation schematic diagram of controller of the present invention.
Specific embodiment
Method of the invention to clearly illustrate illustrates a specific embodiment of the invention in conjunction with attached drawing.
Embodiment 1:
It is as shown in Figure 1 electrical apparatus interstar connection schematic diagram in the present invention, STATCOM primary equipment passes through an isolation transformation
Device connects on generator generator terminal bus, and STATCOM controller accesses Turbo-generator Set rotational speed omega, generator terminal voltage ug、
Generator generator terminal electric current ig, STATCOM export electric current is, STATCOM DC voltage udcEqual signals；STATCOM control simultaneously
Device also receives external reactive power instruction Q*.CT1 is generator terminal current transformer in figure, and PT is machine potential transformer, and CT2 is
STATCOM output current transformer, network system equivalence is two loop lines and infinitely great power-supply system, wherein a loop line has capacitor string
It mends, another loop line does not have capacitor string benefit.
It is the acquisition of the method for the present invention external signal and internal calculation link relation schematic diagram shown in Fig. 2；This hair as shown in Figure 2
A kind of bright generator terminal STATCOM output current control method for inhibiting torsional oscillation, is added power current in the control of generator terminal STATCOM
Compensation calculation link, the power current compensation calculation link give reference value according to reactive power and power current benefit are calculated
Value is repaid, under the action of the power current offset is through excess current control inner ring link, participates in the meter of modulating wave voltage reference value
It calculates.
The above method further include: semaphore measurement links, mode current compensation calculate link, current control inner ring link,
DC voltage control outer ring link, pulse generate link；The power current offset obtained by power current compensation calculation link,
The Model control value that link obtains is calculated by mode current compensation, is mended by the DC current that DC voltage control outer ring link obtains
Value is repaid, three obtains modulating wave voltage reference value under the action of current control inner ring link, generates link finally by pulse
Trigger pulse is generated, the on-off of IGBT in STATCOM is controlled, subsynchronous/supersynchronous electric current required for generating is injected into power generation
Machine stator winding generates the electromagnetic torque for inhibiting torsional oscillation.
In the above method, the semaphore measurement links, function is measurement Turbo-generator Set rotational speed omega, generator
Set end voltage ug, generator generator terminal electric current ig, STATCOM export electric current is, STATCOM DC voltage udc；Wherein, ω is vapour
The revolving speed of turbine generator group steam turbine side or generator side rotor, ugIt is generator three-phase phase voltage or three-phase line voltage, igIt is power generation
Machine three-phase current, isIt is the three-phase current of STATCOM output, udcIt is the three-phase voltage of STATCOM DC side.
In the above method, reactive power gives reference value Q*By power current compensation calculation link, power frequency is calculated
Current offset valuesPower current compensation calculation link is calculated using open loop, first by generator terminal voltage ugIt is converted by dq0
Obtain d axis component ud, then use Q*Divided by ud, obtain required
In the above method, Turbo-generator Set rotational speed omega calculates link by mode current compensation, and each mode is calculated
Controlling value Δ λj, subscript j=1,2,3 ..., N, N indicate that Turbo-generator Set has N number of intrinsic subsynchronous oscillation mode；Mode
The method that current compensation calculates is to change rotational speed omega mark, each torsional oscillation mode amount is isolated by bandpass filter, by each
From ratio enlargement, phase shift, obtain each Model control value Δ λj, j=1,2,3 ..., N.
In the above method, direct voltage reference valueSTATCOM DC voltage udcBy DC voltage control outer ring
DC current offset is calculated in link It is the DC current offset of three-phase, is specifically calculated as follows:
Wherein, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, C33(θa) be one 3 ×
3 diagonal matrix, C33(θa)=diag (cos (θa)cos(θa-2π/3)cos(θa+ 2 π/3)),It is proportional integration
Transmission function, KP1It is proportionality coefficient, KI1It is integral coefficient.
In the above method, electric current i is exported according to the STATCOM that semaphore measurement links obtains, power current compensation calculation
The power current offset of link outputMode current compensation calculates the Model control value Δ λ of link outputj, direct current it is voltage-controlled
The DC current offset of outer ring link output processedThrough excess current control inner ring link, modulating wave voltage reference value is calculated
uref；The calculating step of current control inner ring link includes:
(1) mode current control value first is calculated using following formula
(2) current control deviation Δ i is calculated using following formula agains:
(3) last Δ isBy transfer function H (s), modulating wave voltage reference value u is obtainedref:
uref=H (s) Δ isFormula 4
C in formula 213(θj) and C13(θ0) be all 3 × 1 matrix, be respectively as follows:
C13(θj)=- [sin (θj)sin(θj-2π/3)sin(θj+2π/3)]T,
C13(θ0)=- [sin (θ0)sin(θ0-2π/3)sin(θ0+2π/3)]T,
Wherein θj=θa+σj, θ0=θa, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated,
σjIt is the compensation phase of j-th of mode of setting, subscript j=1, it is N number of intrinsic that 2,3 ..., N, N indicate that Turbo-generator Set has
Subsynchronous oscillation mode；Formula 2 is converted into the mode electric current of three-phase after being superimposed Model control signal with power current offset
Controlling value
In the above method, the calculating step (3) of the current control inner ring link, transfer function H (s) uses proportional integration
Resonant regulator form, is shown below:
Wherein, KPIt is proportionality coefficient, KIIt is integral coefficient, KRIt is resonance coefficient, ζ is resonance damped coefficient, ω0It is power frequency
Angular frequency.
In the above method, the pulse generates link and approaches modulation using nearest level, or uses phase-shifting carrier wave arteries and veins
Rush width modulated.
In the above method, the ontology of the STATCOM uses star-star connection mode, or uses delta connection mode.
Embodiment 2:
The method of the present invention electrical apparatus interstar connection is as shown in Figure 1, STATCOM primary equipment connects by an isolating transformer
On generator generator terminal bus, STATCOM controller accesses Turbo-generator Set rotational speed omega, generator terminal voltage ug, generator
Generator terminal electric current ig, STATCOM export electric current is, STATCOM DC voltage udcEqual signals；STATCOM controller also connects simultaneously
Reactive power outside receiving instructs Q*.CT1 is generator terminal current transformer in figure, and PT is machine potential transformer, and CT2 is
STATCOM output current transformer, network system equivalence is two loop lines and infinitely great power-supply system, wherein a loop line has capacitor string
It mends, another loop line does not have capacitor string benefit.
Generator rated capacity 667MVA, voltage rating 20kV, rated power factor 0.9, generator in the present embodiment
Each reactance parameter per unit value is Xd=2.16, Xd'=0.269, Xd"=0.21, Xq=2.11, Xq"=0.206；Main transformer volume
Constant volume 720MVA, voltage change ratio 500kV/20kV；The shaft system of unit includes high intermediate pressure cylinder rotor (HIP), low pressure (LP) cylinder A rotor
(LPA), low pressure (LP) cylinder B rotor (LPB), generator amature (GEN), their rotary inertia are respectively as follows:
Equivalent torsion stiffness is respectively as follows: between each rotor
| Serial number | Rotor | Torsion stiffness (Nm/rad) |
| 1 | HIP-LPA | 6.237E+07 |
| 2 | LPA-LPB | 1.074E+08 |
| 3 | LPB-GEN | 1.135E+08 |
Shafting natural mode of vibration frequency is 1 frequency 10.71Hz of mode, 2 frequency 18.47Hz of mode, 3 frequency of mode
19.92Hz。
For the present embodiment, STATCOM ontology primary equipment rated capacity 18MVA, voltage rating 10kV；Isolating transformer
Rated capacity 20MVA, voltage rating no-load voltage ratio 22kV/10kV.STATCOM ontology can use star-star connection mode, or use three
Angle scheme mode preferentially uses delta connection mode.STATCOM in this example uses three-phase angle-type scheme mode.
A kind of generator terminal STATCOM output current control method for inhibition torsional oscillation that the present embodiment uses is in generator terminal
In the control of STATCOM be added power current compensation calculation link, semaphore measurement links, mode current compensation calculate link,
Current control inner ring link, DC voltage control outer ring link, pulse generate link；It is obtained by power current compensation calculation link
Power current offset, the obtained Model control value of link is calculated by mode current compensation, by DC voltage control outer ring ring
Obtained DC current offset is saved, three obtains modulating wave voltage reference value, most under the action of current control inner ring link
Link is generated by pulse afterwards and generates trigger pulse, controls the on-off of IGBT in STATCOM, it is subsynchronous required for generating/super
Synchronizing current is injected into generator unit stator winding, generates the electromagnetic torque for inhibiting torsional oscillation.
Specifically implemented using following steps:
Step (1): semaphore measurement links measure Turbo-generator Set rotational speed omega, generator terminal voltage ug, generator
Generator terminal electric current ig, STATCOM export electric current is, STATCOM DC voltage udc；Wherein, ω is Turbo-generator Set steam turbine side
Or the revolving speed of generator side rotor, ugIt is generator three-phase phase voltage or three-phase line voltage, igIt is generator three-phase current, isIt is
The three-phase current of STATCOM output, udcIt is the three-phase voltage of STATCOM DC side.On each analog signals line in Fig. 2 if
It is labelled with slash and number 3, expression is three-phase signal, similarly hereinafter, is repeated no more.
Step (2): as shown in figure 3, reactive power gives reference value Q*By power current compensation calculation link, calculate
To power current offsetPower current compensation calculation link is calculated using open loop, first by generator terminal voltage ugPass through
Dq0 converts to obtain d axis component ud, then use Q*Divided by ud, obtain requiredWherein reactive power gives reference value Q*It can be by sending out
Power plant's automatic voltage regulator control system (AVC system) gives STATCOM controller through communication link.
Step (3): it as shown in figure 3, Turbo-generator Set rotational speed omega calculates link by mode current compensation, is calculated
Each Model control value Δ λj, subscript j=1,2,3 ..., N, N indicate that Turbo-generator Set has N number of intrinsic subsynchronous oscillation mould
State；The method that mode current compensation calculates is to change rotational speed omega mark, isolates each torsional oscillation mode amount by bandpass filter,
By respective ratio enlargement, phase shift, each Model control value Δ λ is obtainedj, j=1,2,3 ..., N.For the present embodiment, altogether
3 mode, N=3,1 frequency 10.71Hz of mode, 2 frequency 18.47Hz of mode, 3 frequency 19.92Hz of mode.
Step (4): as shown in figure 3, direct voltage reference valueSTATCOM DC voltage udcIt is voltage-controlled by direct current
Outer ring link processed, is calculated DC current offsetIt is the DC current offset of three-phase, specifically by following public
Formula calculates:
Wherein, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, C33(θa) be one 3 ×
3 diagonal matrix, C33(θa)=diag (cos (θa)cos(θa-2π/3)cos(θa+ 2 π/3)),It is proportional integration
Transmission function, KP1It is proportionality coefficient, KI1It is integral coefficient.For the present embodiment, KP1=0.8, KI1=10.
Step (5): as shown in figure 3, STATCOM exports electric current is, power current offsetModel control signal delta λj、
DC current offsetThrough excess current control inner ring link, modulating wave voltage reference value u is calculatedref；Current control inner ring
The calculating step of link includes:
(a) mode current control value first is calculated using following formula
(b) current control deviation Δ i is calculated using following formula agains:
(c) last Δ isBy transfer function H (s), modulating wave voltage reference value u is obtainedref:
uref=H (s) Δ isFormula 4
C in formula 213(θj) and C13(θ0) be all 3 × 1 matrix, be respectively as follows:
C13(θj)=- [sin (θj)sin(θj-2π/3)sin(θj+2π/3)]T,
C13(θ0)=- [sin (θ0)sin(θ0-2π/3)sin(θ0+2π/3)]T,
Wherein θj=θa+σj, θ0=θa, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated,
σjIt is the compensation phase of j-th of mode of setting, subscript j=1, it is N number of intrinsic that 2,3 ..., N, N indicate that Turbo-generator Set has
Subsynchronous oscillation mode；Formula 2 is converted into the mode electric current of three-phase after being superimposed Model control signal with power current offset
Controlling value
For the present embodiment, there are 3 mode, compensation phase is σ respectively1=85.35deg, σ2=80.14deg, σ3=
74.90deg.These compensation phases are default by system emulation, determine after finally correcting using field measurement.
Transfer function H (s) in formula 4 uses proportional integration resonant regulator form, as shown in figure 4, following formula table can be used
Show:
Wherein, KPIt is proportionality coefficient, KIIt is integral coefficient, KRIt is resonance coefficient, ζ is resonance damped coefficient, ω0It is power frequency
Angular frequency.For the present embodiment, KP=0.42, KI=11, KR=0.11, ζ=0.01, ω0=100 π rad/s.
In the present embodiment, Fig. 5 gives a result of the method for the present invention application: sending out at the 2s moment network system distal end
Raw phase fault, failure removal after 100ms, Turbo-generator Set generate torsional oscillation in system disturbance, in revolving speed
Each modal components rise, under the inhibiting effect of generator terminal STATCOM, after zero point several seconds, each modal components in revolving speed are bright
Aobvious decaying, torsional oscillation are effectively suppressed.Unit safety is ensured.In addition, pulse above-mentioned generates link and adopts in implementation process
Modulation is approached with nearest level, or is modulated using phase-shifting carrier wave pulse width.It is forced in the present embodiment using nearest level
Nearly modulation.
Embodiment 3:
Fig. 6 show the external signal acquisition and house calculation module relation schematic diagram of controller of the present invention.Of the invention
A kind of specific embodiment for the generator terminal STATCOM controller inhibiting torsional oscillation, including power current compensation calculation module and electric current control
Inner loop module processed, the power current compensation calculation module give reference value according to reactive power and power current compensation are calculated
Value, the power current offset input current control inner loop module participate in the calculating of modulating wave voltage reference value.
Above controller further includes semaphore measurement module, mode current compensation computing module, DC voltage control outer ring
Module, pulse generation module；The power current offset obtained by power current compensation calculation module, by mode current compensation meter
The Model control value that module obtains is calculated, the DC current offset obtained by DC voltage control outer loop module, three is in electric current
Under the action of controlling inner loop module, modulating wave voltage reference value is obtained, generates trigger pulse, control finally by pulse generation module
The on-off of IGBT in STATCOM processed, subsynchronous/supersynchronous electric current required for generating, is injected into generator unit stator winding, generates
Inhibit the electromagnetic torque of torsional oscillation.
In above controller, the semaphore measurement module, function is measurement Turbo-generator Set rotational speed omega, power generation
Machine set end voltage ug, generator generator terminal electric current ig, STATCOM export electric current is, STATCOM DC voltage udc；Wherein, ω is
The revolving speed of Turbo-generator Set steam turbine side or generator side rotor, ugIt is generator three-phase phase voltage or three-phase line voltage, igIt is hair
Motor three-phase current, isIt is the three-phase current of STATCOM output, udcIt is the three-phase voltage of STATCOM DC side.
In above controller, reactive power gives reference value Q*By power current compensation calculation module, work is calculated
Frequency current offset valuesPower current compensation calculation module is calculated using open loop, first by generator terminal voltage ugBecome by dq0
Get d axis component u in returnd, then use Q*Divided by ud, obtain required
In above controller, Turbo-generator Set rotational speed omega passes through mode current compensation computing module, and each mould is calculated
State controlling value Δ λj, subscript j=1,2,3 ..., N, N indicate that Turbo-generator Set has N number of intrinsic subsynchronous oscillation mode；Mould
The method that state current compensation calculates is to change rotational speed omega mark, isolates each torsional oscillation mode amount by bandpass filter, is passed through
Respective ratio enlargement, phase shift obtain each Model control value Δ λj, j=1,2,3 ..., N.
In above controller, direct voltage reference valueSTATCOM DC voltage udcOutside by DC voltage control
DC current offset is calculated in ring moulds blockIt is the DC current offset of three-phase, specifically counts as follows
It calculates:
Wherein, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, C33(θa) be one 3 ×
3 diagonal matrix, C33(θa)=diag (cos (θa) cos(θa-2π/3) cos(θa+ 2 π/3)),It is ratio product
Divide transmission function, KP1It is proportionality coefficient, KI1It is integral coefficient.
In above controller, electric current i is exported according to the STATCOM that semaphore measurement module obtainss, power current compensation meter
Calculate the power current offset of module outputThe Model control value Δ λ of mode current compensation computing module outputj, DC voltage
Control the DC current offset of outer loop module outputThrough excess current control inner loop module, modulating wave Voltage Reference is calculated
Value uref；Current control inner loop module includes following submodule:
(1) mode current control value computational submodule, for mode current control value to be calculated according to following formula
(2) current control deviation computational submodule, for current control deviation Δ to be calculated according to following formula
is:
(3) modulating wave voltage reference value computational submodule, for according to Δ isBy transfer function H (s), modulating wave is obtained
Voltage reference value uref:
uref=H (s) Δ isFormula 4
C in formula 213(θj) and C13(θ0) be all 3 × 1 matrix, be respectively as follows:
C13(θj)=- [sin (θj)sin(θj-2π/3)sin(θj+2π/3)]T,
C13(θ0)=- [sin (θ0)sin(θ0-2π/3)sin(θ0+2π/3)]T,
Wherein θj=θa+σj, θ0=θa, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated,
σjIt is the compensation phase of j-th of mode of setting, subscript j=1, it is N number of intrinsic that 2,3 ..., N, N indicate that Turbo-generator Set has
Subsynchronous oscillation mode；Formula 2 is converted into the mode electric current of three-phase after being superimposed Model control signal with power current offset
Controlling value is *。
In above controller, the transfer function H (s) in the modulating wave voltage reference value computational submodule is using ratio product
Divide resonant regulator form, be shown below:
Wherein, KPIt is proportionality coefficient, KIIt is integral coefficient, KRIt is resonance coefficient, ζ is resonance damped coefficient, ω0It is power frequency
Angular frequency.
In above controller, the pulse generation module approaches modulation using nearest level, or uses phase-shifting carrier wave
Pulse width modulation.
In above controller, the ontology of the STATCOM uses star-star connection mode, or uses delta connection mode.
So far, the explanation of specific embodiment is completed.
The above examples only illustrate the technical idea of the present invention, and this does not limit the scope of protection of the present invention.It is all
According to the technical idea provided by the invention, any equivalent replacement done on the basis of technical solutions or change, without departing from this
Invention protection scope.
Claims (20)
1. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation, which is characterized in that in the control of generator terminal STATCOM
Power current compensation calculation link is added in system, the power current compensation calculation link gives reference value meter according to reactive power
Calculation obtains power current offset, under the action of the power current offset is through excess current control inner ring link, participates in modulation
The calculating of wave voltage reference value.
2. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as described in claim 1, which is characterized in that
Further include: semaphore measurement links, mode current compensation calculate link, current control inner ring link, DC voltage control outer ring
Link, pulse generate link；The power current offset obtained by power current compensation calculation link, by mode current compensation meter
The Model control value that link obtains is calculated, the DC current offset obtained by DC voltage control outer ring link, three is in electric current
Under the action of controlling inner ring link, modulating wave voltage reference value is obtained, link is generated finally by pulse and generates trigger pulse, control
The on-off of IGBT in STATCOM processed, subsynchronous/supersynchronous electric current required for generating, is injected into generator unit stator winding, generates
Inhibit the electromagnetic torque of torsional oscillation.
3. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 2, which is characterized in that
The semaphore measurement links, function are measurement Turbo-generator Set rotational speed omegas, generator terminal voltage ug, generator machine
Hold electric current ig, STATCOM export electric current is, STATCOM DC voltage udc；Wherein, ω be Turbo-generator Set steam turbine side or
The revolving speed of generator side rotor, ugIt is generator three-phase phase voltage or three-phase line voltage, igIt is generator three-phase current, isIt is
The three-phase current of STATCOM output, udcIt is the three-phase voltage of STATCOM DC side.
4. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 1 or 2, feature exist
In reactive power gives reference value Q*By power current compensation calculation link, power current offset is calculatedPower frequency
Current compensation is calculated link and is calculated using open loop, first by generator terminal voltage ugIt converts to obtain d axis component u by dq0d, then use
Q*Divided by ud, obtain required
5. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 2, which is characterized in that
Turbo-generator Set rotational speed omega calculates link by mode current compensation, and each Model control value Δ λ is calculatedj, subscript j=1,
2,3 ..., N, N indicate that Turbo-generator Set has N number of intrinsic subsynchronous oscillation mode；Mode current compensation calculate method be
Rotational speed omega mark is changed, isolates each torsional oscillation mode amount by bandpass filter and is obtained by respective ratio enlargement, phase shift
To each Model control value Δ λj, j=1,2,3 ..., N.
6. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 2, which is characterized in that
Direct voltage reference valueSTATCOM DC voltage udcBy DC voltage control outer ring link, direct current is calculated
Flow offsetIt is the DC current offset of three-phase, is specifically calculated as follows:
Wherein, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, C33(θa) it is one 3 × 3 pair
Angular moment battle array, C33(θa)=diag (cos (θa) cos(θa-2π/3) cos(θa+ 2 π/3)),It is that proportional integration passes
Delivery function, KP1It is proportionality coefficient, KI1It is integral coefficient.
7. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 2, which is characterized in that
Electric current i is exported according to the STATCOM that semaphore measurement links obtains, power current compensation calculation link output power current
OffsetMode current compensation calculates the Model control value Δ λ of link outputj, DC voltage control outer ring link output
DC current offsetThrough excess current control inner ring link, modulating wave voltage reference value u is calculatedref；Current control inner ring
The calculating step of link includes:
(1) mode current control value first is calculated using following formula
(2) current control deviation Δ i is calculated using following formula agains:
(3) last Δ isBy transfer function H (s), modulating wave voltage reference value u is obtainedref:
uref=H (s) Δ isFormula 4
C in formula 213(θj) and C13(θ0) be all 3 × 1 matrix, be respectively as follows:
C13(θj)=- [sin (θj) sin(θj-2π/3) sin(θj+2π/3)]T,
C13(θ0)=- [sin (θ0) sin(θ0-2π/3) sin(θ0+2π/3)]T,
Wherein θj=θa+σj, θ0=θa, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, σjIt is to set
The compensation phase of j-th fixed of mode, subscript j=1, it is N number of intrinsic subsynchronous that 2,3 ..., N, N indicate that Turbo-generator Set has
Torsional oscillation mode；Formula 2 is converted into the mode current control value of three-phase after being superimposed Model control signal with power current offset
8. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 7, which is characterized in that
The calculating step (3) of the current control inner ring link, transfer function H (s) uses proportional integration resonant regulator form, as follows
Shown in formula:
Wherein, KPIt is proportionality coefficient, KIIt is integral coefficient, KRIt is resonance coefficient, ζ is resonance damped coefficient, ω0It is power frequency angular frequency
Rate.
9. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 2, which is characterized in that
The pulse generates link and approaches modulation using nearest level, or is modulated using phase-shifting carrier wave pulse width.
10. a kind of generator terminal STATCOM output current control method for inhibiting torsional oscillation as claimed in claim 2, which is characterized in that
The ontology of the STATCOM uses star-star connection mode, or uses delta connection mode.
11. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation, which is characterized in that the controller includes power current compensation
Computing module and current control inner loop module, the power current compensation calculation module give reference value according to reactive power and calculate
Power current offset is obtained, the power current offset input current control inner loop module participates in modulating wave voltage reference value
Calculating.
12. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 11, which is characterized in that further include letter
Number measurement module, mode current compensation computing module, DC voltage control outer loop module, pulse generation module；By power frequency electric
The power current offset that stream compensation calculation module obtains, the Model control value obtained by mode current compensation computing module, by
The DC current offset that DC voltage control outer loop module obtains, three obtain under the action of current control inner loop module
Modulating wave voltage reference value generates trigger pulse finally by pulse generation module, controls the on-off of IGBT in STATCOM, produces
Subsynchronous/supersynchronous electric current required for raw is injected into generator unit stator winding, generates the electromagnetic torque for inhibiting torsional oscillation.
13. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, it is characterized in that the semaphore
Measurement module, function are measurement Turbo-generator Set rotational speed omegas, generator terminal voltage ug, generator generator terminal electric current ig、
STATCOM exports electric current is, STATCOM DC voltage udc；Wherein, ω is that Turbo-generator Set steam turbine side or generator side turn
The revolving speed of son, ugIt is generator three-phase phase voltage or three-phase line voltage, igIt is generator three-phase current, isIt is that STATCOM is exported
Three-phase current, udcIt is the three-phase voltage of STATCOM DC side.
14. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, it is characterised in that reactive power is given
Determine reference value Q*By power current compensation calculation module, power current offset is calculatedPower current compensation calculation
Module is calculated using open loop, first by generator terminal voltage ugIt converts to obtain d axis component u by dq0d, then use Q*Divided by ud, obtain
To required
15. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, which is characterized in that turbine generator
Generating unit speed ω passes through mode current compensation computing module, and each Model control value Δ λ is calculatedj, subscript j=1,2,3 ...,
N, N indicate that Turbo-generator Set has N number of intrinsic subsynchronous oscillation mode；The method that mode current compensation calculates is by rotational speed omega
Mark is changed, and isolates each torsional oscillation mode amount by bandpass filter, by respective ratio enlargement, phase shift, obtains each mode
Controlling value Δ λj, j=1,2,3 ..., N.
16. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, which is characterized in that DC voltage
Reference valueSTATCOM DC voltage udcBy DC voltage control outer loop module, DC current offset is calculatedIt is the DC current offset of three-phase, is specifically calculated as follows:
Wherein, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, C33(θa) it is one 3 × 3 pair
Angular moment battle array, C33(θa)=diag (cos (θa) cos(θa-2π/3) cos(θa+ 2 π/3)),It is that proportional integration passes
Delivery function, KP1It is proportionality coefficient, KI1It is integral coefficient.
17. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, which is characterized in that according to signal
The STATCOM that measurement module obtains exports electric current is, power current compensation calculation module output power current offset
The Model control value Δ λ of mode current compensation computing module outputj, DC voltage control outer loop module output DC current mend
Repay valueThrough excess current control inner loop module, modulating wave voltage reference value u is calculatedref；Current control inner loop module include with
Lower submodule:
(1) mode current control value computational submodule, for mode current control value to be calculated according to following formula
(2) current control deviation computational submodule, for current control deviation Δ i to be calculated according to following formulas:
(3) modulating wave voltage reference value computational submodule, for according to Δ isBy transfer function H (s), modulation wave voltage is obtained
Reference value uref:
uref=H (s) Δ isFormula 4
C in formula 213(θj) and C13(θ0) be all 3 × 1 matrix, be respectively as follows:
C13(θj)=- [sin (θj) sin(θj-2π/3) sin(θj+2π/3)]T,
C13(θ0)=- [sin (θ0) sin(θ0-2π/3) sin(θ0+2π/3)]T,
Wherein θj=θa+σj, θ0=θa, θaIt is the generator generator terminal A phase voltage fixed phase that phase-locked loop pll is calculated, σjIt is to set
The compensation phase of j-th fixed of mode, subscript j=1, it is N number of intrinsic subsynchronous that 2,3 ..., N, N indicate that Turbo-generator Set has
Torsional oscillation mode；Formula 2 is converted into the mode current control value of three-phase after being superimposed Model control signal with power current offset
18. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, which is characterized in that the modulation
Transfer function H (s) in wave voltage reference value computational submodule uses proportional integration resonant regulator form, is shown below:
Wherein, KPIt is proportionality coefficient, KIIt is integral coefficient, KRIt is resonance coefficient, ζ is resonance damped coefficient, ω0It is power frequency angular frequency
Rate.
19. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, which is characterized in that the arteries and veins
It rushes generation module and modulation is approached using nearest level, or modulated using phase-shifting carrier wave pulse width.
20. a kind of generator terminal STATCOM controller for inhibiting torsional oscillation as claimed in claim 12, which is characterized in that described
The ontology of STATCOM uses star-star connection mode, or uses delta connection mode.
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| CN105024388A (en) * | 2015-04-28 | 2015-11-04 | 华北电力大学 | Sub-synchronous oscillation suppression method based on modal damping current injection |
| CN105633945A (en) * | 2014-11-04 | 2016-06-01 | 国家电网公司 | Electric power system subsynchronous resonance inhibition method |
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