CN107196329A - A kind of electrified railway electric energy administers the grid-connected phase-lock technique of adjusting means - Google Patents

A kind of electrified railway electric energy administers the grid-connected phase-lock technique of adjusting means Download PDF

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Publication number
CN107196329A
CN107196329A CN201710333850.7A CN201710333850A CN107196329A CN 107196329 A CN107196329 A CN 107196329A CN 201710333850 A CN201710333850 A CN 201710333850A CN 107196329 A CN107196329 A CN 107196329A
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phase
line voltage
lock
component
grid
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江友华
吴琪娜
邹明强
刘雪莹
陈博
王文吉
江相伟
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Shanghai University of Electric Power
University of Shanghai for Science and Technology
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Shanghai University of Electric Power
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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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • 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
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • 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
    • H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
    • 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
    • Y02E40/40—Arrangements for reducing harmonics
    • 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
    • Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks

Abstract

The present invention relates to the grid-connected phase-lock technique that a kind of electrified railway electric energy administers adjusting means, this method comprises the following steps：(1) unbalanced source voltage deformation is carried out to the three-phase alternating current component of line voltage, Clark conversion is carried out to the line voltage after deformation, line voltage is mapped in α β rest frames, V is obtainedαβ；(2) Second Order Generalized Integrator SOGI modules are utilized respectively to VαβComponent v on α and β axlesαAnd vβ90 ° of phase shifts are carried out, positive-sequence component is calculated；(3) line voltage is replaced by with the positive-sequence component extracted, the phase-locked function to line voltage is realized by single synchronous coordinate system software phase-lock loop.Compared with prior art, the present invention can effectively filter out the harmonic component in line voltage, and extract basic positive-sequence component therein, successfully realize lock phase.

Description

A kind of electrified railway electric energy administers the grid-connected phase-lock technique of adjusting means
Technical field
The present invention relates to a kind of grid-connected phase-lock technique, adjusting means is administered more particularly, to a kind of electrified railway electric energy Grid-connected phase-lock technique.
Background technology
The power supply of electric railway traction power supply network is reliable and security is that electric locomotive is safe and reliable, economical operation Important leverage.And electric locomotive, as a kind of special electric load, it uses single-phase supplier's formula, when not taking indemnifying measure Inevitably superior power system injects negative-sequence current；Because electric locomotive load is that rectification drives and with randomness, Simultaneously bring the power quality problems such as idle, harmonic wave, voltage pulsation, severe exacerbation traction power supply net and its higher level's power train The quality of power supply of system, especially uneven and harmonic problem.
In order to solve the imbalance and harmonic problem of electric railway traction change, current trend is to use electric railway Electric energy administers adjusting means (RPC), but this device allows for effectively realizing grid-connected, and can adapt to electric railway The big environment of load unbalanced, harmonic content.Traditional hardware phase lock high precision by power grid environment due to being influenceed, it may appear that multiple grid-connected Zero crossing, causes grid-connected failure.And use software phase-lock loop under single synchronous coordinate system to be only applicable to three-phase symmetrical power network, it is based on Although the decoupling software phase-lock loop of double synchronous coordinate systems can adapt to unbalanced power grid, but it is in the high power grid environment of harmonic content Under, it is locked, and phase accuracy rate is very low, and also easily mutually grid-connected failure is locked in appearance.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of electric railway electricity The grid-connected phase-lock technique of adjusting means can be administered, it is the software phase-lock loop decoupled based on double synchronous coordinate systems, pass through two seats The positive-sequence component of fundamental wave is extracted in the conversion of mark system and decoupling, so that the purpose of lock phase is realized, not by unbalanced power supply harmonic etc. Environment factor influences, and accommodation is wider, and accuracy rate is higher.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of electrified railway electric energy administers the grid-connected phase-lock technique of adjusting means, and this method comprises the following steps：
(1) unbalanced source voltage deformation is carried out to the three-phase alternating current component of line voltage, to the power network electricity after deformation Pressure carries out Clark conversion, and line voltage is mapped in α β rest frames, V is obtainedαβ；
(2) Second Order Generalized Integrator SOGI modules are utilized respectively to VαβComponent v on α and β axlesαAnd vβCarry out 90 ° of shiftings Phase, calculates positive-sequence component；
(3) line voltage is replaced by with the positive-sequence component extracted, passes through the realization pair of single synchronous coordinate system software phase-lock loop The phase-locked function of line voltage.
Described Second Order Generalized Integrator SOGI modules are realized by building the sef-adapting filter based on internal model principle 90 ° of phase shifts of input voltage.
The transmission function in s domains is in described Second Order Generalized Integrator SOGI modules：
Or
Wherein, k is transmission function gain, and ω is resonant frequency.
In described step (2), the calculation formula for extracting positive-sequence component is：
In formula,Represent to carry out delayed 90 ° of phase shifts to variable.
In described step (3), line voltage is replaced by after carrying out dq conversion to the positive-sequence component extracted.
Compared with prior art, the present invention has advantages below：
First, the present invention first extract line voltage positive-sequence component, based on the positive-sequence component carry out lock phase processor, not by The environment factors such as unbalanced power supply harmonic influence, and accommodation is wider, and accuracy rate is higher；
2nd, using follow-on 90 ° of phase angle shift schemes based on Second Order Generalized Integrator (SOGI), not only realize defeated 90 ° of phase angles for entering signal partially, and have effectively filtered out harmonic component, it is to avoid locking phase angle constantly shakes caused by harmonic component Swing, realize the lock phase under the conditions of unbalanced source voltage；
3rd, compromise considers filter effect and response speed to determine the transmission function gain of SOGI modules, by sacrificing The filter capacity of low-frequency range has ensured overall filter effect；
4th, using the output frequency of phaselocked loop as wave filter resonance point, it is ensured that the fundametal compoment of power network can be with undamped Extraction, while not influenceing wave filter to the filter capacity of other harmonic components, realize the adaptive ability of frequency.
Brief description of the drawings
Fig. 1 is electric railway electric energy quality comprehensive treatment device simplified pinciple figure；
Fig. 2 is negative sequence compensation vector schematic diagram；
Fig. 3 is each vector distribution of line voltage and coordinate graph of a relation；
Fig. 4 is the double synchronous coordinate system schematic diagrames of DDSRF-SPLL；
Fig. 5 is decoupling block diagram, wherein, (5a) is that positive sequence decouples block diagram, and (5b) is that negative phase-sequence decouples block diagram；
Fig. 6 is LPF Bode diagram；
Fig. 7 is LPF step response diagrams；
Fig. 8 is DSOGI-SPLL control structure block diagrams；
Fig. 9 schemes for D (s) transmission functions bode；
Figure 10 schemes for Q (s) transmission functions bode；
Figure 11 is that harmonic SSRF-SPLL and DDSRF-SPLL locks phase result；
Figure 12 is DSOGI-SPLL lock phase results under harmonic.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to Following embodiments.
First, electrified railway electric energy administers adjusting means
Negative phase-sequence dynamic regulation device is by main circuit and the big portion of control circuit two in electrified railway electric energy improvement adjusting means It is grouped into, as shown in Figure 1.Wherein main circuit is made up of four parts again, and they are the first pwm converter, the 2nd PWM changes respectively Parallel operation, step-down transformer and VV transformers.First pwm converter, which mainly becomes left bridge arm to traction, to carry out flowing in and out control System；Second pwm converter, which mainly becomes right bridge arm to traction, to carry out flowing in and out control；Step-down transformer primarily serves decompression And buffer action；VV transformers primarily serve decompression and supply electricity to locomotive；Between first pwm converter and the second pwm converter Electric capacity play the peaceful ripple of energy storage, and the first pwm converter of connection and the second pwm converter, it is realized solution each other Coupling and be independent of each other.DSP control circuits are main to occur circuit, triggers circuit and corresponding by AD sample detectings circuit, pwm pulse Protection and display circuit composition.The major function of AD sample detecting circuits is to the active and reactive of power network current, harmonic wave and power network Voltage-phase is detected, for controlling balance and energy flow direction；Protection circuit device is mainly over-pressed, under-voltage, excessively stream etc. The detection of signal, the power device for protecting electric railway electric energy quality comprehensive treatment device；Display and input unit are Peripheral circuit, for display and parameter setting.
As shown in figure 1, three-phase 220kV high pressures are changed into the single-phase electricity that 2 voltage class are 27.5kV through three-phase V/V transformers Press to two supply arm locomotive power supplies.Negative phase-sequence dynamic regulation device is connected to two supply arms by 2 step-down transformers, and 2 lean against Back of the body voltage source converter is linked together by 1 shared DC capacitor, and DC capacitor provides DC voltage to two current transformers. Negative phase-sequence dynamic regulation device can use suitable control method, and two inverters of joint realize that active power is transferred to from a supply arm Another supply arm, while idle and harmonic compensation can each be carried out, so as to reach the purpose of negative phase-sequence harmonic compensation.
Because high-speed railway locomotive is generally friendship orthogonal electric locomotive, four-quadrant pulsewidth modulation (pulse width are taken Modulation, PWM) impulse commutation control mode, power factor is close to 1.For ease of analysis, it is assumed that V/V tractive transformers become Than KB=1, α phase supply arms have locomotive load current to be IαL, and β phase supply arm locomotive loads electric current is IβL。
As shown in Fig. 2 UA, UB, UC are primary side three-phase voltage, Uα、UβFor tractive transformer secondary voltage, its phase angle difference π/3.Before the compensation of negative phase-sequence dynamic regulation device, two bridge arms active locomotive load electric current I respectivelyαLAnd IβL, pass through negative phase-sequence first Dynamic regulation device (is (I by the 1/2 of two draft arm watt current differencesαL-IβL)/2), heavily loaded side is transferred to from underloading side, Now the amplitude of two bridge arm currents is respectively IαAnd Iβ, its amplitude is equal, phase angle phase difference of pi/3, but can now calculate and obtain electric current not The degree of balance is 50%.On this basis, certain capacitive reactive power electric current I is compensated in α bridge armscα, make electric current IcβDelayed bridge arm electricity π/6 are pressed, are now had
The two bridge arm current I obtained after so compensatingα、IβOverlapped respectively with IA and IB, phase angle differs 2 π/3, it is possible to Try to achieve primary side C phase currents.Now primary side three-phase current is full symmetric, and negative-sequence current is 0, and can deduce primary side three phase power because Number is all 1, now just reaches the purpose of comprehensive compensation.For the V/V trailer systems in the case of other any loads, negative phase-sequence is moved State adjusting means all follows above-mentioned negative sequence compensation principle.
2nd, electrified railway electric energy administers the grid-connected lock phase of adjusting means
The main function of phaselocked loop is the frequency of real-time detection line voltage, phase angle, but because electric railway is single-phase Load, and traction rectifier is nonlinear-load, there is three-phase imbalance and a large amount of harmonic waves, and this is influence electric railway electricity Can administer adjusting means software phase-lock loop accurately lock the key of phase angle.
1st, line voltage vector analysis
Under the influence of nonlinear load or line voltage failure (single-line to ground fault, line to line fault etc.), power network electricity It can be included in pressure：Positive-sequence component, negative sequence component, zero-sequence component, are represented by：
Wherein：
+ n in formula (2) ,-n, 0n represent the nth harmonic component of positive sequence, negative phase-sequence, zero-sequence component respectively.In grid-connected inverters system It is many in system that power network is connected to by Δ/wye connection transformer, so the present invention does not consider zero-sequence component.So again by voltage point Amount is classified, wherein representing positive sequence nth harmonic component as n ＞ 0, n ＜ 0 represent negative phase-sequence nth harmonic component.
Formula (2) is transformed in α β rest frames by Clark, such as formula (4)：
Wherein：
Formula (4) is transformed in dq rotating coordinate systems by Park, and θ is the angle of rotating coordinate system and α axles, such as formula (5):
Wherein：
The distribution situation of each vector in a coordinate system is as shown in Figure 3.
(ω t=θ), i.e. phase lock loop locks line voltage when the d axles of rotating coordinate system are overlapped with positive sequence fundamental wave vector During phase, formula (6) is met：
It is 0 in q axis components by formula (6) as can be seen that now positive sequence fundametal compoment is DC component in the component of d axles； Positive sequence harmonic component (n ＞ 0) is (n-1) secondary AC compounent, Negative sequence harmonic component (n ＜ 0) in the component that rotational coordinates is fastened It is-(n+1) secondary AC compounent in the component of rotating coordinate system.The amplitude and phase angle of voltage vector are can obtain by formula (6)：
The amplitude that can draw voltage vector by formula (7), (8) is constantly changing, and angular frequency is not also fixed.Carrying out It is difficult the frequency and phase angle of accurate latch voltage vector during lock phase, the present invention extracts fundamental positive sequence and enters horizontal lock, as The frequency and phase angle of line voltage vector.
2nd, software phase-lock loop under single synchronous coordinate system
Negative phase-sequence and zero-sequence component is not present in (three-phase power grid voltage balance), line voltage under preferable power grid environment, only There is positive sequence fundametal compoment, conventional software phase-lock loop is single synchronous coordinate system software phase-lock loop (SSRF-SPLL), its basic thought It is to be converted to the line voltage under three-phase static coordinate system abc under two-phase rotating coordinate system dq, by controlling q shaft voltages to realize To the lock phase of line voltage.The lock phase angle for understanding dq rotating coordinate systems under three-phase equilibrium power network according to pertinent literature can use public affairs Formula is described as follows：
Wherein：
It can be obtained by formula (9) analysis, dq shaft voltage sizes just can be controlled by the output angle θ for adjusting phaselocked loop, it is assumed that In stable state, phase lock loop locks line voltage then has θ=ω t, now vd=| V |, vq=0.Conversely, working as vqWhen=0, now lock Fixed phase angle is grid voltage phase-angle.
But because actual electric network is generally with the presence of harmonic wave so that three-phase power grid voltage is uneven, understood now according to formula (9) Lock phase angle need to could be described correctly with below equation：
vq=V1sin(ωt-θ)+Vnsin(nωt-θ) (10)
As shown from the above formula, due to the presence of harmonic component (including positive sequence harmonic, negative phase-sequence fundamental wave, Negative sequence harmonic), lead Even if causing lock mutually to complete after ω t ≈ θ, vqComponent, which remains unchanged, can have harmonic component, so as to feed back in the closed-loop system of phaselocked loop Go, cause vibration, and then cause locking phase angle constantly to vibrate, it is impossible to complete lock phase.So wanting to solve line voltage injustice Lock phase under the conditions of weighing apparatus, the method that the present invention is used is to extract fundamental positive sequence first, and then fundamental positive sequence is carried out Lock phase.
3rd, the decoupling software phase-lock loop based on double synchronous coordinate systems
SSRF-SPLL phaselocked loops are due to by v in the environment of unbalanced power supplyqMiddle AC compounent influence, it is difficult to complete lock Phase, can filter out AC compounent by reducing the bandwidth of phaselocked loop, but the cost for reducing bandwidth is exactly to make the response of phaselocked loop Slow, significantly impact the performance of phaselocked loop.If the positive sequence fundametal compoment in line voltage can be extracted, then rapidly Enter horizontal lock, it will be prevented effectively from the influence that unbalanced source voltage is brought.Double synchronous coordinate systems decouple software phase-lock loop (DDSRF-SPLL) it is namely based on this thought and completes lock phase.
Voltage vector can be equivalent to by formula (3) by the combination of positive sequence fundametal compoment and harmonic component, as shown in figure 4, building Vertical d-q and dn-qnDouble synchronous coordinate systems.V1For positive sequence fundamental wave vector,For V1With d axle clamps angle；VnFor nth harmonic vector,For VnWith dnAxle clamp angle；θ is the angle of d axles and α axles, i.e. phaselocked loop output angle；N θ are dnThe angle of axle and α axles；
Formula (11) is readily available by Fig. 4, it is contemplated that main harmonic wave is odd harmonic component in unbalanced power grid environment And the negative sequence component that unbalanced power grid is caused, hereinbefore analyzed, by formula (6) it can be seen that positive sequence harmonic component (n ＞ 0) is (n-1) secondary AC compounent in the component that rotational coordinates is fastened, and Negative sequence harmonic component (n ＜ 0) is in rotating coordinate system On component be-(n+1) secondary AC compounent.It is easy to decline higher harmonic components by the limitation of phaselocked loop closed-loop system bandwidth Subtract, 2 subharmonic that fundamental wave negative sequence and 3 subharmonic are formed after park is converted due to fundametal compoment relatively, so It is difficult to be handled by reducing bandwidth, the influence to phaselocked loop is the most serious, to influence negative phase-sequence fundametal compoment the most serious Analyzed, i.e. n=-1.It can be obtained (12) by formula (11).
It can be drawn by formula (12), the presence of negative sequence component causes all to have coupled two frequencys multiplication under positive-sequence coordinate system on dq axles AC compounent, and the wherein part of underscore is fundamental positive sequence and negative sequence component, is also the part that will be extracted, as long as therefore logical Fundametal compoment can just be extracted by crossing suitable method and asking for various average value.Can effectively it be filtered out using low pass filter AC compounent, but the bandwidth of wave filter and response speed are conflicting, thus to extract pure DC component only according to Rely wave filter, then can increase the design difficulty of filter parameter.By observation it can be seen that positive-negative sequence fundametal compoment intercouples, Therefore mathematical Decoupling (13) can be obtained, it is as shown in Figure 5 that it decouples block diagram.
WhereinRespectively the average value of voltage, can be obtained by low-pass first order filter.Its Middle ωfCut-off frequency is represented, corresponding bode figures are as shown in Figure 6.With ωfIncrease, the bandwidth of wave filter becomes big, in 100Hz The damping capacity at place weakens；Fig. 7 is the step response of wave filter, with ωfIncrease, response speed accelerates；Therefore wave filter Response speed and filter capacity it is conflicting, in ωfCompromise is needed to handle during selection.After parameter is designed, by discrete Difference equation is readily available after change and completes digitlization.
The software phase-lock loop decoupled based on double synchronous coordinate systems, which is changed and decoupled by two coordinate systems, extracts fundamental wave Positive-sequence component, so as to realize the purpose of lock phase.Filtered out because DDSRF-SPLL carries out decoupling just for fundamental wave negative sequence component, when When there is a large amount of harmonic waves in system, a large amount of other order harmonic components can be coupled on dq axles, can be with by reducing controller bandwidth Higher hamonic wave is filtered out, but is then difficult to filter out completely for low-order harmonic component.And DDSRF-SPLL algorithm operation quantities are non- Chang great, is realized complex.
3rd, the double Second Order Generalized Integrator software phase-lock loops of modified of the present invention
1st, principle
The grid-connected phase-lock technique that the electrified railway electric energy of the present invention administers adjusting means is based primarily upon the double second orders of modified Generalized Integrator software phase-lock loop.
The conventional method for extracting positive-sequence component is to use symmetrical component method to carry out positive-negative sequence separation on three-phase alternating current component, Its operational formula such as formula (15).J represents to carry out 90 ° of phase shifts to signal in formula, if directly being carried out using formula (15) symmetrical component method Positive-negative sequence separation amount of calculation is larger, and appropriate deformation can be carried out to it, is specifically described as follows.
In formula
When unbalanced source voltage, formula (15) is simplified shown as：
Clark conversion is carried out to line voltage, then had：
Vαβ=[vα vβ]T=[Tαβ]Vabc (17)
In formula：
Therefore, the voltage positive-sequence component under the static α β coordinate systems of two-phaseFor：
In formulaRepresent to carry out delayed 90 ° of phase shifts to variable.
From formula (18), the extraction to line voltage positive-sequence component is completed, it is necessary to carry out 90 ° to input voltage signal Phase shift, so as to obtain two mutually orthogonal components.Under normal circumstances, 90 ° of phase-moving methods include：Cycle delay, differential and Schemes such as all-pass filter, but these schemes are slower to the change of frequency response, especially differential scheme to voltage harmonic compared with For sensitivity.90 ° of phase shifts can be realized using suitable digital filter, therefore the design of digital filter is also whole algorithm energy The key problem of no realization.The present invention proposes a kind of follow-on 90 ° of phase angle shifts based on Second Order Generalized Integrator (SOGI) Scheme produces two-phase orthogonal signal, and this scheme can be not only realized to 90 ° of phase angles of input signal partially, can also filter out high order humorous Ripple, the system block diagram of its control program is as shown in Figure 8.
SOGI modules are orthogonal signal generator in Fig. 8, and its effect is to be filtered input signal, retain assigned frequency The signal of section, while producing the orthogonal signal in another road.SOGI is mainly by building based on the adaptive of internal model principle Wave filter realizes above-mentioned target.S domains transmission function formula such as (19), (20) in SOGI modules：
In formula, k is transmission function gain, and ω is resonant frequency.
The characteristic of above-mentioned transmission function is analyzed by bode figures, Fig. 9 schemes for D (s) transmission functions bode, passes through width Frequency characteristic finds out that D (s) is bandpass filter, centered on resonance point, wherein ω=314.With the reduction of k values, wave filter band Width reduces, and filter effect improves, but response speed is slack-off；By phase-frequency characteristic as can be seen that wave filter is at resonance point Phase shift is zero.Figure 10 for Q (s) transmission functions bode scheme, by amplitude versus frequency characte as can be seen that wave filter low-frequency range decay Weaker, the gain at resonance point is 1, and with the reduction of k values, filter effect improves, but response speed is slack-off, fast after resonance point Speed decay, so wave filter has good filter effect in high band；By phase-frequency characteristic as can be seen that phase at resonance point Shifting is always -90 °, realizes the purpose of phase shift.
By above-mentioned analysis, in view of filter effect is conflicting with response speed, the consideration that can compromise takes k=1.5.In Q (s) find out in the bode figures of transmission function, the filter capacity of its low-frequency range is poor, it is contemplated that the harmonic wave in power network is main with odd Based on harmonic wave, and the frequency shift (FS) of power network is not too large, so the filter capacity of the low-frequency range of wave filter does not interfere with filter The filter effect of ripple device.
It is to be noted that the resonance point of above-mentioned wave filter, i.e. ω are fixed value, that is to say, that resonant frequency is to fix not Become.If the electric voltage frequency of power network shifts, because gain of the wave filter at disresonance point is no longer 1, phase shift It is not 0 ° or -90 °, the result of lock phase will necessarily produce certain error, be degrading the lock phase ability of phaselocked loop.To solve this One problem, can using the output frequency of phaselocked loop as wave filter resonance point, so with the change of mains frequency, wave filter Resonance point can also change so that ensure power network fundametal compoment can with it is zero-decrement extract, while not influenceing wave filter To the filter capacity of other harmonic components.So modified Second Order Generalized Integrator realizes the adaptive ability of frequency.
2nd, experimental result is contrasted
SSRF-SPLL is substantially similar to DDSRF-SPLL lock phase results under harmonic environment, as shown in figure 11, locking Contain substantial amounts of harmonic component in phase angle, locking frequency constantly vibrates.DDSRF-SPLL is decoupled by double synchronous coordinate systems and shelled From only fundamental wave negative sequence component, harmonic component has complicated coupled relation in two coordinates, it is difficult to peel off, so largely Harmonic component, particularly harmonic component is directly inputted in phaselocked loop, causes lock phase result to contain substantial amounts of harmonic component.
Figure 12 is DSOGI-SPLL lock phase results under harmonic.It is first due to when DSOGI-SPLL positive-negative sequence is separated Quadrature component first is produced using two broad sense second-order integrators, its essence has filtered out line voltage equivalent to bandpass filter In harmonic component, and extract basic positive-sequence component therein, it is possible to which lock mutually succeeds.It is to be noted that the filter of wave filter Wave energy power and dynamic are conflicting, need compromise to handle during design parameter.
Preferred embodiment of the invention described in detail above.It should be appreciated that one of ordinary skill in the art without Need creative work just can make many modifications and variations according to the design of the present invention.Therefore, all technologies in the art Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea Technical scheme, all should be in the protection domain being defined in the patent claims.

Claims (5)

1. a kind of electrified railway electric energy administers the grid-connected phase-lock technique of adjusting means, it is characterised in that this method includes following Step：
(1) unbalanced source voltage deformation is carried out to the three-phase alternating current component of line voltage, the line voltage after deformation is entered Row Clark is converted, and line voltage is mapped in α β rest frames, V is obtainedαβ；
(2) Second Order Generalized Integrator SOGI modules are utilized respectively to VαβComponent v on α and β axlesαAnd vβCarry out 90 ° of phase shifts, meter Calculate positive-sequence component；
(3) line voltage is replaced by with the positive-sequence component extracted, is realized by single synchronous coordinate system software phase-lock loop to power network The phase-locked function of voltage.
2. a kind of electrified railway electric energy according to claim 1 administers the grid-connected phase-lock technique of adjusting means, its feature It is, described Second Order Generalized Integrator SOGI modules realize input by building the sef-adapting filter based on internal model principle 90 ° of phase shifts of voltage.
3. a kind of electrified railway electric energy according to claim 1 administers the grid-connected phase-lock technique of adjusting means, its feature It is, the transmission function in s domains is in described Second Order Generalized Integrator SOGI modules：
Or
Wherein, k is transmission function gain, and ω is resonant frequency.
4. a kind of electrified railway electric energy according to claim 1 administers the grid-connected phase-lock technique of adjusting means, its feature It is, in described step (2), the calculation formula for extracting positive-sequence component is：
<mrow> <msubsup> <mi>V</mi> <mrow> <mi>&amp;alpha;</mi> <mi>&amp;beta;</mi> </mrow> <mo>+</mo> </msubsup> <mo>=</mo> <mfrac> <mn>1</mn> <mn>2</mn> </mfrac> <mfenced open = "[" close = "]"> <mtable> <mtr> <mtd> <mrow> <msub> <mi>v</mi> <mi>&amp;alpha;</mi> </msub> <mo>-</mo> <mi>j</mi> <mo>*</mo> <msub> <mi>v</mi> <mi>&amp;beta;</mi> </msub> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mi>j</mi> <mo>*</mo> <msub> <mi>v</mi> <mi>&amp;alpha;</mi> </msub> <mo>+</mo> <msub> <mi>v</mi> <mi>&amp;beta;</mi> </msub> </mrow> </mtd> </mtr> </mtable> </mfenced> </mrow>
In formula,Represent to carry out delayed 90 ° of phase shifts to variable.
5. a kind of electrified railway electric energy according to claim 1 administers the grid-connected phase-lock technique of adjusting means, its feature It is, in described step (3), line voltage is replaced by after carrying out dq conversion to the positive-sequence component extracted.
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