CN107508294A - A kind of method, damping controller and application that maximum electrical damping is provided - Google Patents

A kind of method, damping controller and application that maximum electrical damping is provided Download PDF

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Publication number
CN107508294A
CN107508294A CN201710864763.4A CN201710864763A CN107508294A CN 107508294 A CN107508294 A CN 107508294A CN 201710864763 A CN201710864763 A CN 201710864763A CN 107508294 A CN107508294 A CN 107508294A
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mrow
statcom
msubsup
msub
represent
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刘洪涛
赵化时
王龙飞
陈家乐
高红亮
周华锋
朱建行
侯佳佐
万民惠
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Huazhong University of Science and Technology
China Southern Power Grid Co Ltd
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Huazhong University of Science and Technology
China Southern Power Grid Co Ltd
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
    • H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P2103/00—Controlling arrangements characterised by the type of generator
    • H02P2103/20—Controlling arrangements characterised by the type of generator of the synchronous type
    • 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]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a kind of method, damping controller and application for maximizing electrical damping, belong to electric power system stability control field, this method includes：Obtain the watt current that STATCOM is exported under phaselocked loop coordinate systemAnd reactive currentWillWithEnter line translation and obtain the watt current under rotor coordinateAnd reactive currentAccording toWithWhen obtaining STATCOM Injection Currents inflow generator, amplitude and phase place change expression formula caused by grid branch shunts；STATCOM is obtained to the electrical damping of synchronous machine injection suppression electric current offer according to amplitude and phase place change expression formula；Obtain the maximum amplitude of electrical damping and the phase in electrical damping is compensated, so as to obtain target electrical damping.STATCOM limited capacity is made full use of by the present invention, reduces cost, while realizes and maximum electrical damping is provided, fired power generating unit is mended through string and connects the advantages that Sub-synchronous Resonance that power network triggers plays more preferable inhibition.

Description

A kind of method, damping controller and application that maximum electrical damping is provided
Technical field
The invention belongs to electric power system stability control technical field, is compensated more particularly, to one kind using Static Synchronous The active and reactive binary channels of device STATCOM coordinates control and provides the method for suppressing subsynchronous resonance maximization electrical damping, damping control Device processed and application.
Background technology
With Chinese large-sized Thermal Power Bases construction and transfer electricity from the west to the east power network general layout formation, extensive long distance power transmission into For inexorable trend, the high pressure equipped with series compensation device, extra-high-voltage alternating current transfer passage are by as future electrical energy transfer passage One of important selection.And alternating current circuit of the Large-scale fire-electricity unit access containing series compensation device easily occurs subsynchronous resonance and asked Topic, threaten fired power generating unit safety and power grid operation.
Subsynchronous resonance, which refers to the transmission line of electricity of series compensation, and Turbo-generator Set intercouples causes system damping Weaken and even become negative damping, and then the phenomenon for causing electromechanical oscillations amplitude to strengthen.For the suppression of subsynchronous resonance, both at home and abroad Scholar has pointed out kinds of schemes, and wherein quite a few is the angle from regulating system electrical damping.Its concrete scheme Including installing pole-face winding, supplementary excitation damping control (Supplementary Excitation on synchronous machine rotor Damping Controller, SEDC), utilize flexible AC transmitting system (Flexible Alternative Current Transmission Systems, FACTS) device etc..Wherein STATCOM (Static Synchronous Compensator, STATCOM) due to controllability it is strong, there is provided the advantages that its capacity used is smaller in the case of identical electrical damping is entered And applying STATCOM to suppress sub-synchronous oscillation turns into the emphasis of academia and industrial quarters research.
STATCOM suppresses the general principle of sub-synchronous oscillation in the case where sub-synchronous oscillation occurs, and passes through damping control Device, adjust the effect that the active power sent reaches damping.Specific process is collection generator speed deviation signal through mode The reference value of current control loop is produced after the link such as filtering, phase compensation, scaling, amplitude limit, controls STATCOM to unit Inject subsynchronous band current and the purpose that certain electrical damping reaches suppression sub-synchronous oscillation is produced on generator amature.For Comprehensively utilize the advantage of the idle passages of STATCOM and active passage, it is thus proposed that another scheme, attempt to inject simultaneously it is active and Reactive current is suppressed, but it focuses on analyzing shadow of the active reactive current phase change for producing electromagnetic torque phase Ring, and then to providing the influence of electrical damping, be not directed to how active and reactive current distributes rationally and realize that maximization carries For electrical damping.
In summary, although the existing technology for suppressing sub-synchronous oscillation using STATCOM has tried to propose comprehensive utilization Active and reactive passage, but focus on analyzing, it is not directed to how active and reactive current distributes rationally and provide maximization electricity Vapour lock Buddhist nun.Therefore, how to coordinate the STATCOM of control for active and reactive binary channels, realize that suppressing subsynchronous in maximization shakes The technical barrier that the loss to system is current urgent need to resolve is reduced while swinging suppression.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of side for providing maximum electrical damping Method, damping controller and application, thus solve to suppress to be not directed to active and nothing in the technology of sub-synchronous oscillation in application STATCOM The technical problem for maximizing electrical damping is distributed and provided to work(electric current how rationally.
To achieve the above object, according to one aspect of the present invention, there is provided a kind of method for maximizing electrical damping, bag Include：
(1) watt current that STATCOM is exported under phaselocked loop coordinate system is obtainedAnd reactive current
(2) willWithSynchronous machine rotor coordinate is transformed to, obtains the watt current under rotor coordinateSat with rotor Reactive current under mark system
(3) according to the watt current under rotor coordinateWith the reactive current under rotor coordinateObtain When STATCOM Injection Currents flow into generator armature windings section, amplitude and phase place change caused by grid branch shunts Expression formula；
(4) STATCOM is obtained with phase place change expression formula according to amplitude and injects the electric of suppression electric current offer to synchronous machine Damping；
(5) amplitude coefficient in electrical damping is coordinated and optimized to obtain the maximum amplitude of electrical damping, and to electricity Phase in vapour lock Buddhist nun compensates, so as to obtain target electrical damping.
Preferably, the watt current in step (1)And reactive currentRespectively：
Wherein, K1Represent d axis scale amplification coefficients in STATCOM, K2Represent q axis scale amplification coefficients in STATCOM, F (s) tables Show function of the prefilter in complex frequency domain, Gd(s) the active branch road control complex frequency domain transmission functions of STATCOM, G are representedq(s) table Show that STATCOM idle branches control complex frequency domain transmission function, ωrRepresent the actual speed of unit, ω0Represent the rotating speed under fundamental frequency.
Preferably, in step (2), the watt current under rotor coordinateWith the reactive current under rotor coordinate For：
Wherein, θ represents generator amature d shaft space position angles, and α represents generator voltage phase angle.
Preferably, step (3) specifically includes：
(3.1) inject a subsynchronous band current part in STATCOM and flow into networking, a part flows into synchronous generator When, bySTATCOM and the electric current of generator side and grid side are obtained, wherein,Represent synchronous generator The watt current of generator side is injected under rotor coordinate,Represent to inject generator side under synchronous generator rotor coordinate system Reactive current,The watt current of injection grid side under synchronous generator rotor coordinate system is represented,Represent that synchronous generator turns The reactive current of grid side is injected under subcoordinate system；
(3.2) according to six winding stator of synchronous motor voltage equations and ac transmission network equation, while it is electromechanical to ignore generating Resistance, obtain STATCOM Injection Currents flow into generator armature windings section when, due to grid branch shunt caused by amplitude with Phase place change expression formula：
Wherein, H11(p)、H12(p)、H21And H (p)22(p) represent to have considered lock phase coordinate system and synchronous machine rotor coordinate The subsynchronous band current that conversion and STATCOM are sent between system is to network with exporting the two to synchronous generator both direction The transmission function of factor.
Preferably, step (4) specifically includes：
(4.1) amplitude as caused by shunting grid branch obtains STATCOM with phase place change expression formula and electromagnetic torque The electromagnetic torque provided under corresponding modal frequency：Its In, ψd0Represent the initial magnetic linkage of stator of synchronous motor d axles, ψq0Represent the initial magnetic linkage of stator of synchronous motor q axles, id0Represent synchronous machine The initial current of stator d axles, iq0Represent the initial current of stator of synchronous motor q axles, Lq(p) equivalent d axle inductances, L are representedd(p) table Show equivalent q axle inductances, wherein, C represents function of the external circuit shunting in complex frequency domain, and P represents phaselocked loop coordinate system to synchronous machine The coordinate transform of rotor coordinate；
(4.2) byAnd the electromagnetic torque that STATCOM is provided under corresponding modal frequency is obtained by rotating speed deviation To STATCOM Injection Currents in synchronous motor transmission function expression formula between caused electromagnetic torque：
Wherein, Δ ωrRepresent the variable quantity of generator speed；
(4.3) by Δ TeObtain STATCOM and the electrical damping for suppressing electric current and providing is provided to synchronous machine： Wherein, K is amplitude coefficient, and ξ is phase angle,U0Table Show synchronous generator stator terminal voltage, δ0Represent synchronous generator stator end generator rotor angle initial value, ω0Represent the rotating speed under fundamental frequency.
Preferably, in step (5), coordinated and optimized to obtain electrical damping most to the amplitude coefficient in electrical damping Amplitude, specifically include：
(5.1) byObtain width Value coefficient and d axis scale amplification coefficients K in STATCOM1, q axis scale amplification coefficients K in STATCOM2And system shunting causes Relation between amplitude and phase place change, wherein, H11、H12、H21And H22H is corresponded to respectively11(p)、H12(p)、H21(p) and H22(p) in p=j ωmWhen assignment, δ represent power angle of synchronous generator,The magnetic linkage size of synchronous machine d axles is represented,Represent same Walk the magnetic linkage size of generator q axles, γ11、γ12、γ21And γ22H is corresponded to respectively11(p)、H12(p)、H21And H (p)22(p) In p=j ωmWhen phase；
(5.2) byObtain d axis scale amplification coefficients K1And q axis scales amplification COEFFICIENT K2By constraints during STATCOM capacity limits, wherein, ISTAT_limSTATCOM current capacity maximum is represented, ΔωrRepresent the variable quantity of generator speed；
(5.3) based on constraints, J=max (K) maximum is solved, STATCOM is obtained and electrical damping width is provided The maximum of value.
Preferably, step (5.3) specifically includes：
Based on constraints, obtain so that corresponding d axis scales amplification coefficient K during amplitude coefficient K maximums1And q Axis scale amplification coefficient K2Respectively：
Wherein,
Preferably, in step (5), the phase in electrical damping is compensated, specifically included：
ByPhase in electrical damping is compensated, wherein, k represents phase compensation link Proportionality coefficient, T1Represent leading time constant, T2Represent lag time constant.
To achieve the above object, it is another aspect of this invention to provide that providing a kind of for realizing above-mentioned any one institute The damping controller for the method stated.
To achieve the above object, it is another aspect of this invention to provide that providing a kind of based on above-mentioned damping controller composition STATCOM.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it can obtain down and show Beneficial effect：
The present invention is based on small-signal analysis method, and STATCOM Injection Currents flow into generating in the case of establishing sub-synchronous oscillation Armature windings section amplitude and phase place change caused by grid branch shunts, further give to realize maximum electricity Vapour lock Buddhist nun, current-order calculate the specific design method of link scale parameter and phase compensation link, can played as much as possible STATCOM improves the ability of electrical damping, makes full use of STATCOM limited capacity, reduces cost, while realizes that offer is maximum Electrical damping, it is excellent that the Sub-synchronous Resonance triggered to fired power generating unit through string benefit connection power network plays more preferable inhibition etc. Point.
Brief description of the drawings
Fig. 1 is a kind of schematic flow sheet of method for maximizing electrical damping provided in an embodiment of the present invention；
Fig. 2 is that STACOM suppresses fired power generating unit sub-synchronous oscillation schematic diagram；
Fig. 3 is STATCOM control block diagrams.
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.As long as in addition, technical characteristic involved in each embodiment of invention described below Conflict can is not formed each other to be mutually combined.
It is a kind of schematic flow sheet of method for maximizing electrical damping provided in an embodiment of the present invention as shown in Figure 1, Comprise the following steps in method shown in Fig. 1：
(1) watt current that STATCOM is exported under phaselocked loop coordinate system is obtainedAnd reactive current
(2) willWithSynchronous machine rotor coordinate is transformed to, obtains the watt current under rotor coordinateSat with rotor Reactive current under mark system
(3) according to the watt current under rotor coordinateWith the reactive current under rotor coordinateObtain When STATCOM Injection Currents flow into generator armature windings section, amplitude and phase place change caused by grid branch shunts Expression formula；
(4) STATCOM is obtained with phase place change expression formula according to amplitude and injects the electric of suppression electric current offer to synchronous machine Damping；
(5) amplitude coefficient in electrical damping is coordinated and optimized to obtain the maximum amplitude of electrical damping, and to electricity Phase in vapour lock Buddhist nun compensates, so as to obtain target electrical damping.
First, generator amature shafting is shaken with its certain modal frequency, if its power angle deviation is Δ δ=A sin (ωmT), Then generator amature rotating speed deviation is expressed as：
Δωr=A ωmcos(ωmt) (1)
Wherein, A represents the amplitude of vibration, ωmRepresent a certain Oscillatory mode shape
In an optional embodiment, the watt current in step (1)And reactive currentRespectively：
Wherein, K1Represent d axis scale amplification coefficients in STATCOM, K2Represent q axis scale amplification coefficients in STATCOM, F (s) represent prefilter in the function of complex frequency domain, Gd(s) the active branch road control complex frequency domain transmission functions of STATCOM, G are representedq (s) STATCOM idle branches control complex frequency domain transmission function, ω are representedrRepresent the actual speed of unit, ω0Represent under fundamental frequency Rotating speed.
In an optional embodiment, in step (2), the watt current under rotor coordinateWith rotor coordinate Reactive current under systemFor：
Wherein, θ represents generator amature d shaft space position angles, and α represents generator voltage phase angle.
In an optional embodiment, step (3) specifically includes：
(3.1) inject a subsynchronous band current part in STATCOM and flow into networking, a part flows into synchronous generator When, by
STATCOM and the electric current of generator side and grid side are obtained, wherein,Represent under synchronous generator rotor coordinate system The watt current of generator side is injected,The reactive current of injection generator side under synchronous generator rotor coordinate system is represented, The watt current of injection grid side under synchronous generator rotor coordinate system is represented,Represent the bet of synchronous generator rotor coordinate system Enter the reactive current of grid side；
(3.2) according to six winding stator of synchronous motor voltage equations and ac transmission network equation, while it is electromechanical to ignore generating Resistance, and when operating point small range linearizes to obtain and flows into generator armature windings section in STATCOM Injection Currents, due to electricity Amplitude and phase place change expression formula caused by the shunting of net branch road：
Wherein, R represents alternating current circuit all-in resistance, and L represents alternating current circuit total inductance, and C represents fixed series compensation capacitance value, P represents laplace operator, α0Represent the initial phase angle of generator voltage, θ0Represent generator amature d shaft space initial position angles, ω0 Expression system fundamental frequency angular frequency, Lq(p) equivalent d axle inductances, L are representedd(p) equivalent q axle inductances are represented,
And formula (5) is simplified to obtain：
Wherein, H11(p)、H12(p)、H21And H (p)22(p) represent to have considered lock phase coordinate system and synchronous machine rotor The subsynchronous band current that conversion and STATCOM are sent between coordinate system is to network with exporting this to synchronous generator both direction The transmission function of two factors,WithThe synchronous generator obtained after the small range linearisation of operating point is illustrated respectively in turn The watt current variable quantity of generator side is injected under subcoordinate system with injecting generator side under synchronous generator rotor coordinate system Reactive current variable quantity,WithIt is illustrated respectively under the phaselocked loop coordinate system obtained after the small range linearisation of operating point and exports Watt current variable quantity and phaselocked loop coordinate system under the reactive current variable quantity that exports.
In an optional embodiment, step (4) specifically includes：
(4.1) amplitude as caused by shunting grid branch obtains STATCOM with phase place change expression formula and electromagnetic torque The electromagnetic torque provided under corresponding modal frequency：
Wherein, ψd0Represent the initial magnetic linkage of stator of synchronous motor d axles, ψq0Represent the initial magnetic linkage of stator of synchronous motor q axles, id0 Represent the initial current of stator of synchronous motor d axles, iq0Represent the initial current of stator of synchronous motor q axles, Lq(p) equivalent d axles electricity is represented Sense, Ld(p) equivalent q axle inductances are represented, wherein, C represents function of the external circuit shunting in complex frequency domain, and P represents phaselocked loop coordinate It is the coordinate transform to synchronous machine rotor coordinate；
Wherein, torque formula is：
The product of the middle right side the first two matrix of C matrixes corresponding (5) in formula (8), represents letter of the external circuit shunting in complex frequency domain Number, the 3rd matrix in the middle right side of P correspondings (5), denotation coordination conversion.
(4.2) byAnd the electromagnetic torque that STATCOM is provided under corresponding modal frequency is i.e. according to formula (2) and formula (8) the transmission function expression caused electromagnetic torque in synchronous motor by rotating speed deviation to STATCOM Injection Currents is obtained Formula：
Wherein, Δ ωrRepresent the variable quantity of generator speed；
Further, formula (9) can be organized into：
In formula (10),
(4.3) by Δ TeObtain STATCOM and the electrical damping for suppressing electric current and providing is provided to synchronous machine：
Wherein, K is amplitude coefficient, and ξ is phase angle, U0Represent synchronous generator stator terminal voltage, δ0Represent that synchronous generator is determined Sub- end generator rotor angle initial value, ω0Represent the rotating speed under fundamental frequency.
In an optional embodiment, in step (5), the amplitude coefficient in electrical damping is coordinated and optimized The maximum amplitude of electrical damping is obtained, is specifically included：
(5.1) byObtain width Value coefficient and d axis scale amplification coefficients K in STATCOM1, q axis scale amplification coefficients K in STATCOM2And system shunting causes Relation between amplitude and phase place change, wherein, H11、H12、H21And H22H is corresponded to respectively11(p)、H12(p)、H21(p) and H22(p) in p=j ωmWhen assignment, δ represent power angle of synchronous generator,The magnetic linkage size of synchronous machine d axles is represented,Represent same Walk the magnetic linkage size of generator q axles, γ11、γ12、γ21And γ22H is corresponded to respectively11(p)、H12(p)、H21And H (p)22(p) In p=j ωmWhen phase；
From formula (15), the electrical damping that STATCOM is provided mainly is determined by its amplitude coefficient K and phase angle xi.And this two Individual parameter is mainly by STATCOMd axis scale amplification coefficients K1, q axis scale amplification coefficients K2And system shunting causes amplitude and phase Position change is determined.
(5.2) by
Obtain d axis scale amplification coefficients K1And q axis scale amplification coefficients K2Constrained during by STATCOM capacity limits Condition, wherein, ISTAT_limRepresent STATCOM current capacity maximum, Δ ωrRepresent the variable quantity of generator speed；
(5.3) based on constraints, J=max (K) (17) maximum is solved, STATCOM is obtained and electrically resistance is provided The maximum of Buddhist nun's amplitude.
In an optional embodiment, step (5.3) specifically includes：
According to formula (16) and formula (17), based on constraints, obtain so that corresponding d axles during amplitude coefficient K maximums Rate mu-factor K1And q axis scale amplification coefficients K2Respectively：
Wherein,
In rate mu-factor K1With K2After deciding, phase angle xi can also calculate.
Preferably, when angle is zero between electromagnetic torque and rotating speed deviation, electrical damping is maximum, therefore in STATCOM Controlling unit should increase phase compensation link, and phase angle xi is fallen in compensation.
In an optional embodiment, in step (5), the phase in electrical damping is compensated, specific bag Include：
By
Phase in electrical damping is compensated, wherein, k represents the proportionality coefficient of phase compensation link, T1When representing advanced Between constant, T2Represent lag time constant.
Wherein, in engineering for convenience, T can be made1=-T2, because k can use negative value, thus its compensate domain degree be -360 °~ 360°.It can realize that the active and reactive binary channels based on STATCOM coordinates control and maximizes electrical damping by above method Design and realization.
In another embodiment of the present invention, there is provided a kind of damping control for being used to realize the method for maximum electrical damping Device processed.
In another embodiment of the present invention, there is provided a kind of Static Synchronous compensation formed based on damping controller Device.
In order to preferably provide electrical damping, suppress fired power generating unit subsynchronous resonance, the Static Synchronous that the present invention refers to is mended Fired power generating unit generator terminal will be installed on and the low-pressure side of main transformer is accessed by house transformer by repaying device STATCOM, such as Fig. 2 institutes Show.
STATCOM mainly includes controller and hardware components, and controller receives synchronous machine speed error signal, is calculated The command value of watt current and reactive current.STATCOM hardware configurations can be divided into Three-phase full-bridge structure and three-phase chain structure.
In an optional embodiment, the control strategy for three-phase bridge structure is structure shown in Fig. 3：
Basic control is dq current decoupled controls in figure 3.Set end voltage is synchronized by phaselocked loop to orient, and defines d Axle is orientation axes, then d shaft currents are active current, and q shaft currents are reactive current component.According to analysis result above, During steady-state operation, STATCOM q shaft currents command value is 0, i.e., does not send and also do not absorb any reactive power, the instruction of d shaft currents Value is determined by DC voltage controller.
Additional damping controller controls for ratio, and its input is generator speed deviation, exports to add watt current Command value, it is opposite with rotor speed bias direction that negative sign represents watt current direction.Rotor speed deviation is in synchronous speed coordinate System is lower to be obtained, and dq coordinate systems are also in synchronous speed coordinate system, therefore sub-synchronous oscillation frequency need not be carried out to take complementary frequency Rate.In theory, vibration of this method to all frequency ranges is respectively provided with damping, but for the vibration of different frequency, identical In the case of damping gain, frequency is lower, and the oscillation energy needed for damped oscillation is bigger, to the capacity requirement of DC voltage just It is bigger, the stability of DC voltage is destroyed, therefore, can be by sub-synchronous oscillation of concern in order to reduce unnecessary cost Oscillator signal below frequency is filtered out, therefore the high pass for filtering out low-frequency oscillation frequency band can be added before speed error signal Wave filter.The wave filter available digital narrow band filter is formed, therefore can need not carry out phase to sub-synchronous oscillation mode Compensation.This method need not differentiate the mode of specific frequency, therefore have good robust adaptability.
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 (10)

  1. A kind of 1. method for maximizing electrical damping, it is characterised in that including：
    (1) watt current that STATCOM is exported under phaselocked loop coordinate system is obtainedAnd reactive current
    (2) willWithSynchronous machine rotor coordinate is transformed to, obtains active electricity of the STATCOM under synchronous machine rotor coordinate StreamWith the reactive current under rotor coordinate
    (3) according to the watt current under rotor coordinateWith the reactive current under rotor coordinateObtain and noted in STATCOM When entering electric current inflow generator armature windings section, amplitude and phase place change expression formula caused by grid branch shunts；
    (4) STATCOM is obtained to the electrical damping of synchronous machine injection suppression electric current offer according to amplitude and phase place change expression formula；
    (5) amplitude coefficient in electrical damping is coordinated and optimized to obtain the maximum amplitude of electrical damping, and to electrically resistance Phase in Buddhist nun compensates, so as to obtain target electrical damping.
  2. 2. according to the method for claim 1, it is characterised in that the watt current in step (1)And reactive currentPoint It is not：
    Wherein, K1Represent d axis scale amplification coefficients in STATCOM, K2Represent q axis scale amplification coefficients in STATCOM, F (s) tables Show function of the prefilter in complex frequency domain, Gd(s) the active branch road control complex frequency domain transmission functions of STATCOM, G are representedq(s) table Show that STATCOM idle branches control complex frequency domain transmission function, ωrRepresent the actual speed of unit, ω0Represent the rotating speed under fundamental frequency.
  3. 3. according to the method for claim 2, it is characterised in that in step (2), the watt current under rotor coordinate With the reactive current under rotor coordinateFor：
    Wherein, θ represents generator amature d shaft space position angles, and α represents generator voltage phase angle.
  4. 4. according to the method for claim 3, it is characterised in that step (3) specifically includes：
    (3.1) inject a subsynchronous band current part in STATCOM and flow into networking, when a part flows into synchronous generator, bySTATCOM and the electric current of generator side and grid side are obtained, wherein,Represent synchronous generator rotor The watt current of generator side is injected under coordinate system,Represent to inject the idle of generator side under synchronous generator rotor coordinate system Electric current,The watt current of injection grid side under synchronous generator rotor coordinate system is represented,Represent that synchronous generator rotor is sat The reactive current of the lower injection grid side of mark system；
    (3.2) according to six winding stator of synchronous motor voltage equations and ac transmission network equation, while ignore generator resistance, obtain To STATCOM Injection Currents flow into generator armature windings section when, due to grid branch shunt caused by amplitude and phase Change expression formula：
    Wherein, H11(p)、H12(p)、H21And H (p)22(p) represent to have considered lock phase coordinate system and synchronous machine rotor coordinate The subsynchronous band current that conversion and STATCOM are sent between system is to network with exporting the two to synchronous generator both direction The transmission function of factor,WithIt is illustrated respectively in the synchronous generator rotor coordinate obtained after the small range linearisation of operating point Idle electricity of the watt current variable quantity of the lower injection generator side of system with injecting generator side under synchronous generator rotor coordinate system Flow variable quantity,WithBe illustrated respectively under the phaselocked loop coordinate system obtained after the linearisation of operating point small range export it is active Current change quantity and the reactive current variable quantity exported under phaselocked loop coordinate system.
  5. 5. according to the method for claim 4, it is characterised in that step (4) specifically includes：
    (4.1) amplitude as caused by shunting grid branch obtains STATCOM in phase with phase place change expression formula and electromagnetic torque The electromagnetic torque provided under modal frequency is provided：Wherein, ψd0 Represent the initial magnetic linkage of stator of synchronous motor d axles, ψq0Represent the initial magnetic linkage of stator of synchronous motor q axles, id0Represent stator of synchronous motor d The initial current of axle, iq0Represent the initial current of stator of synchronous motor q axles, Lq(p) equivalent d axle inductances, L are representedd(p) represent equivalent Q axle inductances, wherein, C represents function of the external circuit shunting in complex frequency domain, and P represents that phaselocked loop coordinate system is sat to synchronous machine rotor Mark the coordinate transform of system；
    (4.2) byAnd the electromagnetic torques that are provided under corresponding modal frequency of STATCOM obtain by rotating speed deviation to STATCOM Injection Currents transmission function expression formula between caused electromagnetic torque in synchronous motor：
    Wherein, Δ ωrRepresent the variable quantity of generator speed；
    (4.3) by Δ TeObtain STATCOM and the electrical damping for suppressing electric current and providing is provided to synchronous machine： Wherein, K is amplitude coefficient, and ξ is phase angle,U0Table Show synchronous generator stator terminal voltage, δ0Represent synchronous generator stator end generator rotor angle initial value, ω0Represent the rotating speed under fundamental frequency.
  6. 6. according to the method for claim 5, it is characterised in that in step (5), the amplitude coefficient in electrical damping is entered Row coordination optimization obtains the maximum amplitude of electrical damping, specifically includes：
    (5.1) byObtain amplitude system Number and d axis scale amplification coefficients K in STATCOM1, q axis scale amplification coefficients K in STATCOM2And system shunting causes amplitude Relation between phase place change, wherein, H11、H12、H21And H22H is corresponded to respectively11(p)、H12(p)、H21And H (p)22(p) In p=j ωmWhen assignment, δ represent power angle of synchronous generator,The magnetic linkage size of synchronous machine d axles is represented,Represent synchronous hair The magnetic linkage size of motor q axles, γ11、γ12、γ21And γ22H is corresponded to respectively11(p)、H12(p)、H21And H (p)22(p) in p =j ωmWhen phase；
    (5.2) byObtain d axis scale amplification coefficients K1And q axis scale amplification coefficients K2 By constraints during STATCOM capacity limits, wherein, ISTAT_limRepresent STATCOM current capacity maximum, Δ ωr Represent the variable quantity of generator speed；
    (5.3) based on constraints, J=max (K) maximum is solved, STATCOM is obtained and electrical damping amplitude is provided Maximum.
  7. 7. according to the method for claim 6, it is characterised in that step (5.3) specifically includes：
    Based on constraints, obtain so that corresponding d axis scales amplification coefficient K during amplitude coefficient K maximums1And q axis scales Amplification coefficient K2Respectively：
    <mrow> <msub> <mi>K</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>I</mi> <mrow> <mi>S</mi> <mi>T</mi> <mi>A</mi> <mi>T</mi> <mo>_</mo> <mi>lim</mi> </mrow> </msub> <mrow> <msub> <mi>&amp;Delta;&amp;omega;</mi> <mi>r</mi> </msub> </mrow> </mfrac> <msqrt> <mrow> <mfrac> <mrow> <msubsup> <mi>J</mi> <mn>1</mn> <mn>2</mn> </msubsup> <mo>+</mo> <msubsup> <mi>J</mi> <mn>4</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>2</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>3</mn> <mn>2</mn> </msubsup> </mrow> <mrow> <mn>2</mn> <msqrt> <mrow> <mn>4</mn> <msup> <mrow> <mo>(</mo> <msub> <mi>J</mi> <mn>1</mn> </msub> <msub> <mi>J</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>J</mi> <mn>3</mn> </msub> <msub> <mi>J</mi> <mn>4</mn> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <mrow> <mo>(</mo> <msubsup> <mi>J</mi> <mn>1</mn> <mn>2</mn> </msubsup> <mo>+</mo> <msubsup> <mi>J</mi> <mn>4</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>2</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>3</mn> <mn>2</mn> </msubsup> <mo>)</mo> </mrow> </mrow> </msqrt> </mrow> </mfrac> <mo>+</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> </mrow> </msqrt> </mrow>
    <mrow> <msub> <mi>K</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <msub> <mi>I</mi> <mrow> <mi>S</mi> <mi>T</mi> <mi>A</mi> <mi>T</mi> <mo>_</mo> <mi>lim</mi> </mrow> </msub> <mrow> <msub> <mi>&amp;Delta;&amp;omega;</mi> <mi>r</mi> </msub> </mrow> </mfrac> <msqrt> <mrow> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mo>-</mo> <mfrac> <mrow> <msubsup> <mi>J</mi> <mn>1</mn> <mn>2</mn> </msubsup> <mo>+</mo> <msubsup> <mi>J</mi> <mn>4</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>2</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>3</mn> <mn>2</mn> </msubsup> </mrow> <mrow> <mn>2</mn> <msqrt> <mrow> <mn>4</mn> <msup> <mrow> <mo>(</mo> <msub> <mi>J</mi> <mn>1</mn> </msub> <msub> <mi>J</mi> <mn>2</mn> </msub> <mo>-</mo> <msub> <mi>J</mi> <mn>3</mn> </msub> <msub> <mi>J</mi> <mn>4</mn> </msub> <mo>)</mo> </mrow> <mn>2</mn> </msup> <mo>+</mo> <mrow> <mo>(</mo> <msubsup> <mi>J</mi> <mn>1</mn> <mn>1</mn> </msubsup> <mo>+</mo> <msubsup> <mi>J</mi> <mn>4</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>2</mn> <mn>2</mn> </msubsup> <mo>-</mo> <msubsup> <mi>J</mi> <mn>3</mn> <mn>2</mn> </msubsup> <mo>)</mo> </mrow> </mrow> </msqrt> </mrow> </mfrac> </mrow> </msqrt> </mrow>
    Wherein,
  8. 8. according to the method for claim 5, it is characterised in that in step (5), the phase in electrical damping is mended Repay, specifically include：
    ByPhase in electrical damping is compensated, wherein, k represents the ratio system of phase compensation link Number, T1Represent leading time constant, T2Represent lag time constant.
  9. A kind of 9. damping controller for being used to realize the method for the maximum electrical damping described in claim 1 to 8 any one.
  10. A kind of 10. STATCOM that damping controller based on described in claim 9 is formed.
CN201710864763.4A 2017-09-22 2017-09-22 A kind of method, damping controller and application that maximum electrical damping is provided Pending CN107508294A (en)

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