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 PDFInfo
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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
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
the axle line voltage AC compounent keeps
is DC quantity, with effective condition of work of satisfying the PI controller and keep the stable of its output (line voltage frequency
).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
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:
2. with the static three-phase/two phase coordinates conversion of the stator voltage signal that collects
process, obtain comprising the line voltage synthetic vector
of voltage harmonic and positive and negative preface component;
3. utilize phasing degree
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
;
4. the q axis signal of the line voltage synthetic vector
that step 3 obtained being sent into the PI controller that is designed regulates; Obtain the frequency
of electrical network positive sequence fundamental voltage, then mains frequency
; Frequency
to the positive sequence fundamental voltage that obtains is carried out integral operation, can obtain the phasing degree
of electrical network positive sequence fundamental voltage;
5. the q axis signal of the line voltage synthetic vector
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
of resonant mode PLL output that
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
;
Send into pi regulator 5.2 will just change, obtain the angular frequency
of three phase network voltage positive-sequence component with the q axle component
of voltage synthetic vector in the leg speed rotating coordinate system
;
5.3 the three phase network voltage angle frequency
that step 5.2 obtains is carried out integration, obtains the phasing degree
of three phase network voltage positive-sequence component;
5.4 adopt like 5.2 identical steps the q axle component
of voltage synthetic vector
sent into the resonance compensation device, obtain the three phase network voltage-phase and follow the tracks of compensation of phase angle
;
5.5 step 5.3 electric network voltage phase angle
that obtains and the compensation of phase signal
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
that the line voltage synthetic vector
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
;
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
and nth harmonic component
, 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
, the trapper that is respectively 300Hz and 100Hz through the front and back stages cutoff frequency can directly obtain the positive sequence fundamental component
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
;
7.3? The input signal with a notch through the pre-filtered signal subtraction, get the n-th harmonic component
; Step 4 for the grid frequency
, the phase angle
and Step 7 for the positive sequence grid voltage fundamental component
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
and the actual grid phase vector
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
;
;
and
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
;
;
and
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
;
;
and
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
;
;
and
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
;
;
and
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
;
;
and
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
;
With the mains voltage signal that collects
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:
Where
,
denote the voltage space vector in the stationary coordinate system
,
axis component;
,
,
grid voltage representing a phase, b-phase, c-phase voltage.
3. utilize phasing degree
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:
Wherein
;
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
of the line voltage synthetic vector
that step 3 obtained is sent into PI controller (4); Obtain the angular frequency
of positive sequence fundamental voltage, then mains frequency
; Frequency
to the positive sequence fundamental voltage that obtains is carried out integration (5) computing, can obtain the phasing degree
of electrical network positive sequence fundamental voltage;
5. the q axis signal of the line voltage synthetic vector
that step 3 obtained being sent into the resonant mode PLL (3) that is designed regulates; Obtain the true phase place
of line voltage, concrete steps are:
5.1 utilize the feedback phase signal
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
;
Send into pi regulator (4) 5.2 will just change, obtain the angular frequency
of three phase network voltage positive-sequence component with the q axle component
of voltage synthetic vector in the leg speed rotating coordinate system
;
5.3 the three phase network voltage angle frequency
that step 5.2 obtains is carried out integral operation (5), obtains the phasing degree
of three phase network voltage positive-sequence component;
5.4 adopt like 5.2 identical steps the q axle component
of voltage synthetic vector
sent into resonance compensation device (6), obtain the three phase network voltage-phase and follow the tracks of compensation of phase angle
;
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:
Wherein,
,
are respectively the scale-up factor of two resonance regulators, in order to the decision systems dynamic responding speed;
,
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
that obtains and the compensation of phase signal
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 synchronously rotating reference frame conversion is just being changeed at the phasing degree
that the line voltage synthetic vector
that step 2 obtained is obtained according to step 4 again, obtains line voltage synthetic vector
;
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
, line voltage positive sequence fundamental component
, negative phase-sequence fundamental component
and nth harmonic component
;
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
,
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
, negative phase-sequence fundametal compoment
and nth harmonic component
.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
, the trapper that is respectively 300Hz and 100Hz through the front and back stages cutoff frequency can directly obtain the positive sequence fundamental component
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
;
7.3, can obtain nth harmonic component
with the signal subtraction of input signal with the filtering of process prime trapper.
Figure 3 shows a conventional PLL detected grid voltage vector
and the actual grid voltage vector
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
lags behind the position angle
with actual electric network voltage vector
, and the difference of position angle between the two is defined as
.
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
contains 2 frequencys multiplication, 6 frequency multiplication flutter components among Fig. 7; The phasing degree, promptly
also no longer is strict triangular wave; Line voltage d, q axle component; Be that
among Fig. 8,
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
, the phasing degree
With fundamental voltage positive sequence
d,
qThe axle component
,
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
,
With
,
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
;
(3) utilize phasing degree
that line voltage synthetic vector in the rest frame that obtains
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
is sent to the PI controller that is designed and regulates; Obtain the angular frequency
of positive sequence fundamental voltage, then mains frequency
; Frequency
to the positive sequence fundamental voltage that obtains is carried out integral operation, obtains the phasing degree
of line voltage positive sequence first-harmonic;
The q axis signal of the line voltage synthetic vector that (5) step (3) is obtained
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
utilizes step (4) to obtain again, obtains line voltage synthetic vector
;
(7) to step (6) to obtain the grid voltage integrated vector
into the phase sequence separation module, get the grid voltage fundamental positive sequence component
, fundamental negative sequence component
and n times (n represents 5 or 7) harmonic component
; step (4) to obtain the grid frequency
, the phase angle
, and step (7) for the grid voltage positive sequence fundamental component
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)
and phasing degree
obtain through following substep:
(=1 roman i) utilizes resonant mode software PLL output feedback phase signal
that
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
of voltage synthetic vector in the leg speed rotating coordinate system
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
is carried out integral operation, obtain the phasing degree
of threephase stator voltage positive-sequence component;
(=4 * roman iv) adopt like (ii) identical step the q axle component
of voltage synthetic vector
sent into the resonant mode compensator, obtain the threephase stator voltage-phase and follow the tracks of compensation of phase angle
;
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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