CN102305886A - Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage - Google Patents

Fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage Download PDF

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Publication number
CN102305886A
CN102305886A CN201110142921A CN201110142921A CN102305886A CN 102305886 A CN102305886 A CN 102305886A CN 201110142921 A CN201110142921 A CN 201110142921A CN 201110142921 A CN201110142921 A CN 201110142921A CN 102305886 A CN102305886 A CN 102305886A
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voltage
phase
fundamental
component
sequence
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CN102305886B (en
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徐海亮
贺益康
周鹏
章玮
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Zhejiang University ZJU
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Zhejiang University ZJU
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Abstract

The invention discloses a fundamental voltage synchronous signal detection method during harmonic distortion and unbalance of network voltage. A novel resonant phase locked loop (PLL) can quickly compensate phase tracking errors caused by various network faults, effectively inhibit frequency fluctuation and phase jitter caused by a negative sequence and a harmonic component in the network voltage, and realize accurate detection of fundamental voltage synchronous signals in a distorted network. The method can meet the detection requirements on voltage frequency, amplitude and phase under the ideal network conditions, is particularly suitable for capturing the fundamental voltage synchronous signals under severe transient state and stable state network faults such as network voltage drop, unbalance, harmonic pollution and the like, and can realize quick extraction of the positive and negative sequences and the harmonic component in the voltage. The method has the characteristics of high detection accuracy and good real-time property, can provide an accurate control basis for operating control of grid-connected power equipment such as various wind generating sets, solar photovoltaic grid-connected devices, reversible speed control transmission systems, dynamic reactive compensators and the like.

Description

Fundamental voltage sychronizing signal detecting method when Voltage Harmonic distortion and imbalance
Technical field
Fundamental voltage sychronizing signal detecting method when the present invention relates to a kind of Voltage Harmonic distortion and imbalance; Be applicable to the detection of reference signal in the power equipment control such as grid type inverter, reactive-load compensator, uninterrupted power source; Be particularly suitable under the imperfect electrical network condition wind power generating set and strengthen service ability control, and the obtaining fast of required electrical network fundamental voltage phase place, amplitude and the frequency of the reversible AC speed regulating kinematic train of four-quadrant high performance control.
Background technology
In recent years; The widespread use of power electronic equipments such as electric locomotive in electric system along with uncontrollable rectifier, irreversible AC speed regulating kinematic train, reactive power compensator, solar photovoltaic power generation grid-connecting inverter and single phase power supply; Voltage Harmonic is polluted and the three-phase imbalance problem is on the rise; Cause the generation of line voltage, current waveform distortion and negative sequence component, the safe operation of influence other loads that connect.Particularly in the area that distributed generation system (wind-power electricity generation, solar energy power generating etc.) is incorporated into the power networks on a large scale, the concentrated use of various power electronic equipments makes the partial electric grid voltage waveform distortion very serious.Meanwhile; It is terminal that these regional electrical networks often are in remote electric system, and the less stable of system is prone to take place all kinds of electric network faults; Cause problems such as line voltage rapid drawdown, phase hit, three-phase voltage be asymmetric; Have influence on accurate detection, worsened the runnability of control system, particularly vector control system, bring difficulty for the operation control of various power electronic equipments as electrical network fundamental voltage frequency, phase place and the amplitude of control benchmark.Therefore, break down when causing voltage waveform distortion and three-phase imbalance, quick and precisely detecting of voltage fundamental synchronizing signal just become prerequisite and the key that various power electronic equipments are realized effectively operation control at electrical network.
Only have fundamental positive sequence voltage in the electrical network under the normal electrical network condition, (Phase-locked loop, PLL) technology can obtain the voltage synchronizing signal easily as the control benchmark to adopt traditional voltage zero passage detection or phaselocked loop.But when line voltage contained low-order harmonic and three-phase imbalance, because of conventional phase locked loops can not suppress the humorous interference that involves negative sequence component, the zero crossing that makes the fault line voltage was not the zero crossing of its first-harmonic, has produced the detection error.A kind of simple treating method is to use as fundamental voltage after distortion voltage is carried out signal filtering and done phase compensation, but this will cause the slack-off and voltage magnitude of response speed to detect existing than mistake.
The existing conventional P LL detection method of improving can reduce three types:
1. adopt the method for wave filter.In order to get rid of the influence of harmonic wave and negative sequence component to fundamental voltage positive-sequence component frequency and phase-detection; Usually adopt in low-pass filter or trapper filtering
Figure 2011101429218100002DEST_PATH_IMAGE001
the axle line voltage AC compounent keeps
Figure 845472DEST_PATH_IMAGE002
is DC quantity, with effective condition of work of satisfying the PI controller and keep the stable of its output (line voltage frequency
Figure 2011101429218100002DEST_PATH_IMAGE003
).This method is the interference of filtering harmonic and negative sequence component effectively, but because of in the control closed loop, having introduced the dynamic responding speed that wave filter has a strong impact on PLL, causes the hysteresis that fundamental voltage positive-sequence component frequency, phase place and amplitude are detected.
2. the method that adopts phase sequence to separate.In order to eliminate the humorous negative sequence component that involves contained in the line voltage, adopt phase sequence separation method or improvement phase sequence separation method to extract needed fundamental voltage signal in the phaselocked loop based on symmetrical component method.Though this method also can be introduced the time delay that positive and negative preface is separated,, thereby the PLL dynamic property there is not influence owing to the phase sequence separating treatment is positioned at outside the PLL control loop.The defective of these class methods is that the phase sequence decouples computation is complicated and very responsive to the mains frequency disturbance.
3. improve the method for controller.In order to overcome the defective of above-mentioned two types of detection methods, the PI controller that improves among the conventional P LL becomes the focus that phaselocked loop is studied.Relatively be typically and adopt lead-lag controller (Lag/lead controller) replacement pi regulator that
Figure 256731DEST_PATH_IMAGE002
regulated.This improvement regulator takes to increase the control system bandwidth to improve dynamic responding speed, also has two frequencys multiplication (negative phase-sequence) and the ability of predetermined number of times harmonic wave in the filtering simultaneously.But the design of this quasi-controller needs the contradiction between resolution system stability and the dynamic responding speed, and the system control parameters design is comparatively complicated.
Visible through above analysis, the core content of the detection method of fundamental voltage synchronizing signal is to try hard to overcome in the line voltage harmonic wave and negative sequence component to the influence of PI controller when existing Voltage Harmonic distortion and three-phase imbalance.This is because when mains by harmonics distortion and three-phase imbalance, just changeing the line voltage of expressing in the synchronous rotating frame DqThe axle component all contains 6 frequencys multiplication (300Hz) and 2 frequencys multiplication (100Hz) flutter component.The PI controller conditioned bandwidth that conventional P LL adopted and the restriction of gain margin are difficult to realize the effective adjusting to AC compounent, cause the fluctuation of output voltage amplitude in the synchronous rotating frame, frequency and the shake of lock phase angle, have had a strong impact on the detection effect.
Summary of the invention
The objective of the invention is to deficiency, the detection method of fundamental voltage synchronizing signal when a kind of Voltage Harmonic distortion and imbalance are provided to prior art.
Fundamental voltage sychronizing signal detecting method when Voltage Harmonic distortion of the present invention and imbalance comprises following steps:
1. utilize one group of (three) voltage hall sensor to gather three phase network voltage signal
Figure 2011101429218100002DEST_PATH_IMAGE005
;
2. with the static three-phase/two phase coordinates conversion of the stator voltage signal that collects
Figure 442862DEST_PATH_IMAGE005
process, obtain comprising the line voltage synthetic vector of voltage harmonic and positive and negative preface component;
3. utilize phasing degree
Figure DEST_PATH_IMAGE009
that line voltage synthetic vector in the resulting rest frame is just being changeed with the leg speed rotating coordinate transformation, just changeed with the line voltage synthetic vector in the leg speed rotating coordinate system
Figure 2011101429218100002DEST_PATH_IMAGE012
;
4. the q axis signal of the line voltage synthetic vector
Figure 101114DEST_PATH_IMAGE012
that step 3 obtained being sent into the PI controller that is designed regulates; Obtain the frequency
Figure 2011101429218100002DEST_PATH_IMAGE014
of electrical network positive sequence fundamental voltage, then mains frequency
Figure 700591DEST_PATH_IMAGE016
; Frequency
Figure DEST_PATH_IMAGE017
to the positive sequence fundamental voltage that obtains is carried out integral operation, can obtain the phasing degree
Figure 915541DEST_PATH_IMAGE019
of electrical network positive sequence fundamental voltage;
5. the q axis signal of the line voltage synthetic vector
Figure 97124DEST_PATH_IMAGE012
that step 3 obtained being sent into the resonant mode PLL that is designed regulates; Obtain the true phase place of line voltage, concrete steps are:
5.1 utilize the feedback phase signal
Figure 2011101429218100002DEST_PATH_IMAGE020
of resonant mode PLL output that
Figure 373570DEST_PATH_IMAGE021
just changeed with the leg speed rotating coordinate transformation, just changeed with the voltage synthetic vector that contains DC component and 2 frequencys multiplication, 6 frequency multiplication of ac sums in the leg speed rotating coordinate system
Figure 1997DEST_PATH_IMAGE012
;
Send into pi regulator 5.2 will just change, obtain the angular frequency
Figure 851191DEST_PATH_IMAGE014
of three phase network voltage positive-sequence component with the q axle component
Figure DEST_PATH_IMAGE023
of voltage synthetic vector in the leg speed rotating coordinate system
Figure 365983DEST_PATH_IMAGE012
;
5.3 the three phase network voltage angle frequency that step 5.2 obtains is carried out integration, obtains the phasing degree
Figure DEST_PATH_IMAGE025
of three phase network voltage positive-sequence component;
5.4 adopt like 5.2 identical steps the q axle component
Figure 747974DEST_PATH_IMAGE023
of voltage synthetic vector
Figure 795062DEST_PATH_IMAGE012
sent into the resonance compensation device, obtain the three phase network voltage-phase and follow the tracks of compensation of phase angle
Figure DEST_PATH_IMAGE027
;
5.5 step 5.3 electric network voltage phase angle
Figure 669663DEST_PATH_IMAGE025
that obtains and the compensation of phase signal
Figure 2011101429218100002DEST_PATH_IMAGE028
that step 5.4 obtains are carried out additive operation; Can obtain true phase signal ; I.e. , and then constitute closed-loop control;
6. the phase place
Figure 860011DEST_PATH_IMAGE025
that the line voltage synthetic vector
Figure 787013DEST_PATH_IMAGE021
that step 2 obtained is obtained according to step 5 is just being changeed the synchronously rotating reference frame conversion again, obtains line voltage synthetic vector
Figure 2011101429218100002DEST_PATH_IMAGE032
;
7. the just commentaries on classics that step 6 is obtained is sent into the phase sequence separation module that is designed with voltage synthetic vector in the leg speed rotating coordinate system ; Obtain line voltage positive sequence fundamental component , negative phase-sequence fundamental component
Figure 822654DEST_PATH_IMAGE036
and nth harmonic component
Figure 2011101429218100002DEST_PATH_IMAGE038
, concrete steps are:
Send into the phase sequence separation module that is designed 7.1 will just change with voltage synthetic vector in the leg speed rotating coordinate system
Figure 812476DEST_PATH_IMAGE012
, the trapper that is respectively 300Hz and 100Hz through the front and back stages cutoff frequency can directly obtain the positive sequence fundamental component
Figure 13650DEST_PATH_IMAGE034
of line voltage;
Subtract each other 7.2 will pass through the voltage signal of prime trapper and back stage notch device filtering, can obtain negative sequence voltage component
Figure 659395DEST_PATH_IMAGE036
;
7.3? The input signal with a notch through the pre-filtered signal subtraction, get the n-th harmonic component
Figure 971427DEST_PATH_IMAGE038
; Step 4 for the grid frequency , the phase angle
Figure 81335DEST_PATH_IMAGE041
and Step 7 for the positive sequence grid voltage fundamental component
Figure 453410DEST_PATH_IMAGE034
Common constitutes the present invention is to be detected and the grid voltage harmonic distortion of the fundamental voltage imbalance synchronization signal.
The invention has the beneficial effects as follows; The fundamental voltage sychronizing signal detecting method can fast, accurately obtain the information such as phase place, frequency and amplitude of first-harmonic synchronizing signal when Voltage Harmonic distortion of the present invention and imbalance; Need not to adopt a large amount of wave filters to carry out Filtering Processing, also need not complicated rotation of coordinate and calculate, and do not receive the influence of frequency jitter; Hardware requirement is low; Algorithm is simple, is easy to Project Realization, can reliable control benchmark be provided for grid connected wind power unit and other power electronic equipment operations under imperfect electrical network condition of being incorporated into the power networks.
Description of drawings
The detection method schematic diagram of first-harmonic synchronous voltage signal when Fig. 1 representes Voltage Harmonic distortion and the three-phase imbalance among the present invention.
Fig. 2 representes the structural representation of phase sequence separation module among the present invention;
Figure 3 shows the resulting grid voltage vector lock
Figure 586451DEST_PATH_IMAGE043
and the actual grid phase vector
Figure 702175DEST_PATH_IMAGE045
spatial relationship between the map.
Fig. 4 representes conventional P LL principle of phase lock loop property structural drawing.
The simulation waveform figure that adopts conventional P LL phase-lock technique to obtain when Fig. 5 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure; T=0.25s causes line voltage generation harmonic distortion and three-phase imbalance because of the impact nonlinear load constantly, t=0.35s nonlinear load excision constantly; (a) ~ (d) represents electrical network three-phase voltage, mains frequency, phasing degree and voltage dq axle component respectively among the figure.
The simulation waveform figure that adopts detection method of the present invention to obtain when Fig. 6 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure; T=0.25s causes line voltage generation harmonic distortion and three-phase imbalance because of the impact nonlinear load constantly, t=0.35s nonlinear load excision constantly.(a) ~ (g) represents electrical network three-phase voltage, mains frequency, phasing degree, integrated voltage dq axle component, fundamental voltage positive sequence dq component, fundamental voltage negative phase-sequence dq component, voltage harmonic dq component respectively among the figure.
The frequency, the phase place experimental waveform figure that adopt conventional P LL phase-lock technique to obtain when Fig. 7 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure
Figure DEST_PATH_IMAGE047
; ;
Figure DEST_PATH_IMAGE049
and
Figure 271882DEST_PATH_IMAGE051
representes the electrical network three-phase voltage respectively; Mains frequency; Voltage-phase and fault beginning and ending time zone bit.
The fundamental voltage experimental waveform figure that adopts conventional P LL phase-lock technique to obtain when Fig. 8 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure
Figure 626640DEST_PATH_IMAGE047
;
Figure 546055DEST_PATH_IMAGE053
;
Figure 302658DEST_PATH_IMAGE055
and
Figure 78853DEST_PATH_IMAGE051
representes the electrical network three-phase voltage respectively; Just changeing fundamental voltage d under the synchronous coordinate system; Q axle component and fault beginning and ending time zone bit.
The frequency, the phase place experimental waveform figure that adopt detection method of the present invention to obtain when Fig. 9 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure
Figure 186487DEST_PATH_IMAGE047
;
Figure 706330DEST_PATH_IMAGE040
; and
Figure 405481DEST_PATH_IMAGE051
and represent the electrical network three-phase voltage respectively; Mains frequency; Voltage-phase and fault beginning and ending time zone bit.
The fundamental positive sequence voltage experimental waveform figure that adopts detection method of the present invention to obtain when Figure 10 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure
Figure 734831DEST_PATH_IMAGE047
;
Figure 996048DEST_PATH_IMAGE057
; and
Figure 523982DEST_PATH_IMAGE051
representes the electrical network three-phase voltage respectively; Just changeing fundamental voltage positive sequence d under the synchronous coordinate system; Q axle component and fault beginning and ending time zone bit.
The first-harmonic negative sequence voltage experimental waveform figure that adopts detection method of the present invention to obtain when Figure 11 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure
Figure 845242DEST_PATH_IMAGE047
; ; and
Figure 786522DEST_PATH_IMAGE051
representes the electrical network three-phase voltage respectively; Just changeing fundamental voltage negative phase-sequence d under the synchronous coordinate system; Q axle component and fault beginning and ending time zone bit.
The harmonic voltage experimental waveform figure that adopts detection method of the present invention to obtain when Figure 12 representes electrical network generation harmonic distortion and instantaneous three-phase imbalance fault; Among the figure
Figure 585850DEST_PATH_IMAGE047
;
Figure DEST_PATH_IMAGE065
;
Figure DEST_PATH_IMAGE067
and
Figure 296186DEST_PATH_IMAGE051
representes the electrical network three-phase voltage respectively; Just changeing harmonic voltage d under the synchronous coordinate system; Q axle component and fault beginning and ending time zone bit.
Embodiment
The present invention provides the comparatively simple Voltage Harmonic distortion of a kind of Project Realization and the detection method of fundamental voltage synchronizing signal when uneven, and this method only need increase by resonance compensation device that two resonance frequencies are respectively 2 times, 6 times mains frequencies in conventional PLL can effectively alleviate the influence to fundamental voltage frequency, phase place, amplitude detection of Voltage Harmonic and negative sequence component.Simultaneously, the resonance compensation device that is added during the three phase network voltage symmetry is output as zero, can the steady-state behaviour of PLL not exerted an influence, and can not hinder the detection effect under the normal electrical network condition, thereby have stronger robustness.In addition; The present invention also provides a kind of phase sequence decomposition method based on the multifrequency trapper; Can accurately isolate line voltage fundamental positive sequence, negative sequence component and harmonic component in case of necessity, and because of it is in outside the phaselocked loop, so can not cause phase-detection time delay and departure.
Below in conjunction with accompanying drawing and case study on implementation the present invention is described further.
With reference to Fig. 1, the detection method of fundamental voltage synchronizing signal may further comprise the steps when Voltage Harmonic distortion described in the invention and imbalance:
1. utilize one group of (three) voltage hall sensor to gather electrical network three-phase voltage signal
Figure 788348DEST_PATH_IMAGE005
;
With the mains voltage signal that collects
Figure 826711DEST_PATH_IMAGE005
through static three-phase/two phase coordinates conversion (1), obtain comprising in the rest frame the humorous line voltage synthetic vector that involves positive and negative preface component.
Static three-phase/two phase coordinates conversion expression formulas are as follows:
Figure DEST_PATH_IMAGE069
Where
Figure DEST_PATH_IMAGE071
,
Figure DEST_PATH_IMAGE073
denote the voltage space vector in the stationary coordinate system ,
Figure DEST_PATH_IMAGE077
axis component; ,
Figure DEST_PATH_IMAGE081
,
Figure 509420DEST_PATH_IMAGE083
grid voltage representing a phase, b-phase, c-phase voltage.
3. utilize phasing degree
Figure 2011101429218100002DEST_PATH_IMAGE084
that line voltage synthetic vector in the rest frame that obtains is just being changeed with leg speed rotating coordinate transformation (2), just changeed with the line voltage synthetic vector in the leg speed rotating coordinate system .
The flutter component (being caused by line voltage 5 times, 7 subharmonic) that had both contained 300Hz in this component contains the flutter component (being caused by imbalance of three-phase voltage) of 100Hz again; Just changeing with leg speed rotating coordinate transformation relation and be:
Figure 2011101429218100002DEST_PATH_IMAGE086
Wherein
Figure 963907DEST_PATH_IMAGE053
;
Figure 524201DEST_PATH_IMAGE055
just changeing the d with the line voltage synthetic vector in the leg speed rotating coordinate system respectively; Q axle component.
4. the q axle component
Figure 371120DEST_PATH_IMAGE023
of the line voltage synthetic vector
Figure 92585DEST_PATH_IMAGE012
that step 3 obtained is sent into PI controller (4); Obtain the angular frequency
Figure 315942DEST_PATH_IMAGE014
of positive sequence fundamental voltage, then mains frequency
Figure 793060DEST_PATH_IMAGE016
; Frequency
Figure 821363DEST_PATH_IMAGE024
to the positive sequence fundamental voltage that obtains is carried out integration (5) computing, can obtain the phasing degree
Figure 321614DEST_PATH_IMAGE019
of electrical network positive sequence fundamental voltage;
5. the q axis signal of the line voltage synthetic vector
Figure 804548DEST_PATH_IMAGE012
that step 3 obtained being sent into the resonant mode PLL (3) that is designed regulates; Obtain the true phase place
Figure 339435DEST_PATH_IMAGE009
of line voltage, concrete steps are:
5.1 utilize the feedback phase signal
Figure 249622DEST_PATH_IMAGE020
of resonant mode PLL output that just changeed with leg speed rotating coordinate transformation (2), just changeed with the voltage synthetic vector that contains DC component and 2 frequencys multiplication, 6 frequency multiplication of ac sums in the leg speed rotating coordinate system
Figure 523794DEST_PATH_IMAGE012
;
Send into pi regulator (4) 5.2 will just change, obtain the angular frequency
Figure 797015DEST_PATH_IMAGE014
of three phase network voltage positive-sequence component with the q axle component
Figure 322172DEST_PATH_IMAGE023
of voltage synthetic vector in the leg speed rotating coordinate system
Figure 913187DEST_PATH_IMAGE012
;
5.3 the three phase network voltage angle frequency
Figure 621752DEST_PATH_IMAGE024
that step 5.2 obtains is carried out integral operation (5), obtains the phasing degree
Figure 865652DEST_PATH_IMAGE025
of three phase network voltage positive-sequence component;
5.4 adopt like 5.2 identical steps the q axle component
Figure 345360DEST_PATH_IMAGE023
of voltage synthetic vector
Figure 383221DEST_PATH_IMAGE012
sent into resonance compensation device (6), obtain the three phase network voltage-phase and follow the tracks of compensation of phase angle
Figure 973788DEST_PATH_IMAGE087
;
The resonance compensation device is composed in parallel by the resonance regulator that two cutoff frequencys are respectively 100Hz, 300Hz, and its time domain transport function is:
Figure 9877DEST_PATH_IMAGE089
Wherein,
Figure 698347DEST_PATH_IMAGE091
,
Figure 147783DEST_PATH_IMAGE093
are respectively the scale-up factor of two resonance regulators, in order to the decision systems dynamic responding speed;
Figure 314322DEST_PATH_IMAGE095
,
Figure 532814DEST_PATH_IMAGE097
are respectively the cutoff frequency of two resonance regulators; In order to increase system bandwidth; Reduce the sensitivity of resonance compensation device to frequency disturbance, its representative value is 5 ~ 15rad/s in the real system.
5.5 step 5.3 electric network voltage phase angle
Figure 392186DEST_PATH_IMAGE025
that obtains and the compensation of phase signal
Figure 2011101429218100002DEST_PATH_IMAGE098
that step 5.4 obtains are carried out additive operation; Can obtain true phase signal
Figure 125655DEST_PATH_IMAGE009
; I.e. , and then constitute closed-loop control;
6. the synchronously rotating reference frame conversion is just being changeed at the phasing degree
Figure 464736DEST_PATH_IMAGE025
that the line voltage synthetic vector
Figure 434463DEST_PATH_IMAGE010
that step 2 obtained is obtained according to step 4 again, obtains line voltage synthetic vector
Figure DEST_PATH_IMAGE099
;
7. the just commentaries on classics that step 6 is obtained is sent into the phase sequence separation module that is designed with voltage synthetic vector in the leg speed rotating coordinate system
Figure 685501DEST_PATH_IMAGE099
, line voltage positive sequence fundamental component , negative phase-sequence fundamental component
Figure 449244DEST_PATH_IMAGE036
and nth harmonic component
Figure 650418DEST_PATH_IMAGE038
;
The phase sequence separation module schematic diagram that Fig. 2 proposes for the present invention.Its input signal is for just changeing with the of ac that comprises DC quantity and
Figure 296163DEST_PATH_IMAGE101
,
Figure DEST_PATH_IMAGE103
mains frequency in the leg speed rotating coordinate system, and the output signal is for just changeing with line voltage positive sequence fundametal compoment in the leg speed rotating coordinate system
Figure DEST_PATH_IMAGE105
, negative phase-sequence fundametal compoment and nth harmonic component
Figure DEST_PATH_IMAGE109
.With reference to Fig. 2, the phase sequence separation method practical implementation step that the present invention proposes is following:
Send into the phase sequence separation module (8) that is designed 7.1 will just change with voltage synthetic vector in the leg speed rotating coordinate system
Figure 857463DEST_PATH_IMAGE032
, the trapper that is respectively 300Hz and 100Hz through the front and back stages cutoff frequency can directly obtain the positive sequence fundamental component
Figure 29688DEST_PATH_IMAGE034
of line voltage;
Subtract each other 7.2 will pass through the voltage signal of prime trapper and back stage notch device filtering, can obtain negative sequence voltage component
Figure 401763DEST_PATH_IMAGE036
;
7.3, can obtain nth harmonic component
Figure 472487DEST_PATH_IMAGE038
with the signal subtraction of input signal with the filtering of process prime trapper.
Step 4 Get the grid frequency
Figure 588211DEST_PATH_IMAGE040
, the phase angle
Figure 490308DEST_PATH_IMAGE025
and Step 7 for the positive sequence grid voltage fundamental component
Figure 33285DEST_PATH_IMAGE034
together constitute the present invention to be detected and the grid voltage harmonic distortion of the fundamental voltage imbalance synchronization signal.
Figure 3 shows a conventional PLL detected grid voltage vector
Figure 388043DEST_PATH_IMAGE043
and the actual grid voltage vector
Figure 307457DEST_PATH_IMAGE045
spatial relationship between the map.It is thus clear that; When faults such as line voltage generation electric voltage dropping; The position angle of detected line voltage vector
Figure 64060DEST_PATH_IMAGE043
lags behind the position angle with actual electric network voltage vector , and the difference of position angle between the two is defined as
Figure 954208DEST_PATH_IMAGE028
.
Fig. 4 representes the principle assumption diagram of conventional P LL; Because conventional P LL adopts PI mode regulation voltage angular frequency to come tracking error, its dynamic response is slower, and can't realize the adjusting to AC compounent.
The simulation waveform figure that adopts conventional P LL lock to obtain mutually when Fig. 5 representes line voltage generation harmonic distortion and three-phase imbalance fault.Can find out when electrical network generation harmonic distortion and when having negative sequence component, the restriction of conditioned bandwidth and gain margin, conventional P LL exports mains frequency, promptly contains 2 frequencys multiplication, 6 frequency multiplication flutter components among Fig. 5 (b); The phasing degree, promptly 5 (c) also no longer are strict triangular waves; Line voltage d, q axle component, i.e. also there is shake in 5 (d) output, thereby is difficult to for the safe operation of the power equipment that is incorporated into the power networks reliable control benchmark is provided.
When representing line voltage generation harmonic distortion and three-phase imbalance fault, adopt Fig. 6 the inventive method to detect the simulation waveform that obtains.Visible by Fig. 8 (b), (c); The inventive method not only can accurately be caught the fundamental voltage synchronizing signal when Voltage Harmonic distortion and three-phase imbalance; For the power equipment that is incorporated into the power networks provides reliable control benchmark, the phase sequence separation method that Fig. 8 (e) ~ (g) shows the present invention and designed also can be isolated the negative phase-sequence and the harmonic component of line voltage preferably.
The experimental waveform figure that adopts conventional P LL lock to obtain mutually when Fig. 7, Fig. 8 represent line voltage generation harmonic distortion and three-phase imbalance fault.Can find out when electrical network generation harmonic distortion and when having negative sequence component; Conventional P LL exports mains frequency, and promptly
Figure DEST_PATH_IMAGE111
contains 2 frequencys multiplication, 6 frequency multiplication flutter components among Fig. 7; The phasing degree, promptly
Figure 166883DEST_PATH_IMAGE049
also no longer is strict triangular wave; Line voltage d, q axle component; Be that
Figure 433917DEST_PATH_IMAGE053
among Fig. 8,
Figure 429554DEST_PATH_IMAGE055
output also exist shake, thereby is difficult to for the safe operation of the power equipment that is incorporated into the power networks reliable control benchmark is provided.
When representing line voltage generation harmonic distortion and three-phase imbalance fault, adopt Fig. 9 to Figure 12 the inventive method to detect the experimental waveform figure that obtains.Visible by Fig. 9, Figure 10, the inventive method can accurately be caught fundamental voltage synchronizing signal, i.e. frequency when Voltage Harmonic distortion and three-phase imbalance
Figure 160750DEST_PATH_IMAGE040
, the phasing degree
Figure 482010DEST_PATH_IMAGE049
With fundamental voltage positive sequence d, qThe axle component
Figure 33077DEST_PATH_IMAGE112
,
Figure 160302DEST_PATH_IMAGE059
Thereby for the power equipment that is incorporated into the power networks provides reliable synchronizing signal, Figure 11, Figure 12 show that phase sequence separation method that the present invention designs also can isolate the negative phase-sequence and 5 order harmonic components of line voltage preferably, promptly ,
Figure 910269DEST_PATH_IMAGE063
With
Figure DEST_PATH_IMAGE113
,
Figure 276528DEST_PATH_IMAGE067
In sum; The detection method of fundamental voltage synchronizing signal when Voltage Harmonic distortion disclosed by the invention and imbalance; Not only can satisfy and control obtaining accurately, fast of benchmark under all kinds of electric network faults; Also can realize the quick separation of line voltage fundamental positive sequence, negative sequence component and harmonic component, have very high accuracy of detection and superior dynamic and static characteristic, and algorithm be simple; Be easy to Project Realization, can under all kinds of electric network fault situation, provide and control benchmark accurately for wind-powered electricity generation unit, all kinds of power equipments such as power electronic equipment and AC speed regulating kinematic train that are incorporated into the power networks.

Claims (4)

1. the Voltage Harmonic distortion and the detection method of fundamental voltage synchronizing signal when uneven is characterized in that, may further comprise the steps:
(1) utilize one group of (three) voltage hall sensor to gather the three phase network voltage signal;
(2) with the static three-phase/two phase coordinates conversion of the mains voltage signal that collects process, obtain comprising positive and negative preface and harmonic component at interior line voltage synthetic vector
Figure 863487DEST_PATH_IMAGE002
;
(3) utilize phasing degree
Figure 705541DEST_PATH_IMAGE004
that line voltage synthetic vector in the rest frame that obtains
Figure 100750DEST_PATH_IMAGE006
is just being changeed with the leg speed rotating coordinate transformation, just changeed with the line voltage synthetic vector that comprises negative phase-sequence and harmonic component in the leg speed rotating coordinate system ;
The q axis signal of the line voltage synthetic vector that (4) step (3) is obtained
Figure 862219DEST_PATH_IMAGE008
is sent to the PI controller that is designed and regulates; Obtain the angular frequency
Figure 191569DEST_PATH_IMAGE010
of positive sequence fundamental voltage, then mains frequency
Figure 2011101429218100001DEST_PATH_IMAGE012
; Frequency
Figure 515103DEST_PATH_IMAGE013
to the positive sequence fundamental voltage that obtains is carried out integral operation, obtains the phasing degree
Figure 246298DEST_PATH_IMAGE015
of line voltage positive sequence first-harmonic;
The q axis signal of the line voltage synthetic vector that (5) step (3) is obtained
Figure 426613DEST_PATH_IMAGE008
is sent into the resonant mode PLL that is designed and is regulated, and obtains the true phasing degree of line voltage;
(6) the synchronously rotating reference frame conversion is just being changeed at the phasing degree that the line voltage synthetic vector that step (2) is obtained
Figure 2011101429218100001DEST_PATH_IMAGE016
utilizes step (4) to obtain again, obtains line voltage synthetic vector
Figure DEST_PATH_IMAGE019
;
(7) to step (6) to obtain the grid voltage integrated vector
Figure 714045DEST_PATH_IMAGE019
into the phase sequence separation module, get the grid voltage fundamental positive sequence component
Figure 206206DEST_PATH_IMAGE021
, fundamental negative sequence component
Figure 510148DEST_PATH_IMAGE023
and n times (n represents 5 or 7) harmonic component
Figure 785272DEST_PATH_IMAGE025
; step (4) to obtain the grid frequency , the phase angle
Figure 888543DEST_PATH_IMAGE017
, and step (7) for the grid voltage positive sequence fundamental component
Figure 679781DEST_PATH_IMAGE021
together constitute the present invention to be detected and the grid voltage harmonic distortion of the fundamental voltage imbalance synchronization signal.
2. the detection method of fundamental voltage synchronizing signal when a kind of Voltage Harmonic distortion according to claim 1 and three-phase imbalance; It is characterized in that the angular frequency of the described voltage of step (4)
Figure 2011101429218100001DEST_PATH_IMAGE028
and phasing degree
Figure 883229DEST_PATH_IMAGE017
obtain through following substep:
(=1 roman i) utilizes resonant mode software PLL output feedback phase signal
Figure 443524DEST_PATH_IMAGE029
that
Figure 2011101429218100001DEST_PATH_IMAGE030
just changeed with the leg speed rotating coordinate transformation, just changeed with the voltage synthetic vector that comprises DC component and 2 frequencys multiplication, 6 frequency multiplication AC compounent sums in the leg speed rotating coordinate system ;
(=2 ii) will just change with the q axle component
Figure 235265DEST_PATH_IMAGE032
of voltage synthetic vector in the leg speed rotating coordinate system
Figure 290443DEST_PATH_IMAGE008
roman and send into the PI controller, obtain the angular frequency of threephase stator voltage positive-sequence component;
(=3 * roman iii) the threephase stator voltage angle frequency that obtains
Figure 774700DEST_PATH_IMAGE028
is carried out integral operation, obtain the phasing degree
Figure 2011101429218100001DEST_PATH_IMAGE034
of threephase stator voltage positive-sequence component;
(=4 * roman iv) adopt like (ii) identical step the q axle component
Figure 279816DEST_PATH_IMAGE032
of voltage synthetic vector
Figure 779565DEST_PATH_IMAGE008
sent into the resonant mode compensator, obtain the threephase stator voltage-phase and follow the tracks of compensation of phase angle
Figure 2011101429218100001DEST_PATH_IMAGE036
;
(=5 * roman v) with step (=3 * the electrical network phasing degree that iii) obtains of roman and step (=4 * the compensation of phase signal
Figure 422271DEST_PATH_IMAGE037
that iv) obtains of roman carry out additive operation; Can obtain feedback phase signal ; I.e. , and then constitute closed-loop control.
3. the detection method of fundamental voltage synchronizing signal when a kind of Voltage Harmonic distortion according to claim 1 and three-phase imbalance; It is characterized in that; The described resonant mode PLL of step (5) adds that by conventional P LL two resonance frequencies are respectively resonance compensation device (the Resonant compensator of 2 times, 6 times mains frequencies; Hereinafter to be referred as " R compensator ") compose in parallel effective inhibition of the phase perturbation that can realize simultaneously line voltage 5 times, 7 order harmonic components and negative sequence component are caused.
4. the detection method of fundamental voltage synchronizing signal when a kind of Voltage Harmonic distortion according to claim 1 and imbalance; It is characterized in that; The described phase sequence separation module of step (7) is composed in series by the trapper that two groups of front and back stages trap frequencies are respectively 300Hz, 100Hz, through the signal before and after the input two-stage trapper is made fundamental frequency positive sequence, negative sequence component and the harmonic component that signed magnitude arithmetic(al) obtains line voltage respectively.
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