CN106487039A - A kind of Phase Lock Technique suitable for network deformation - Google Patents
A kind of Phase Lock Technique suitable for network deformation Download PDFInfo
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- CN106487039A CN106487039A CN201610824617.4A CN201610824617A CN106487039A CN 106487039 A CN106487039 A CN 106487039A CN 201610824617 A CN201610824617 A CN 201610824617A CN 106487039 A CN106487039 A CN 106487039A
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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
- H02J3/40—Synchronising a generator for connection to a network or to another generator
- H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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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
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention discloses a kind of Phase Lock Technique suitable for network deformation, in traditional three-phase phase-locked loop, add repetitive controller closed loop, on the basis of original Parker conversion fixed phase, compensate for harmonic phase, substantially reduce under the conditions of unbalanced source voltage and distortion, the error of fundamental frequency and phase-detection.Therefore, the present invention is applied to general network deformation, under this condition, can that accurately and quickly detect frequency and the phase information of fundamental voltage, so as to ensureing actual electric network, being particularly light current grid type power electronic equipment reliability of operation off the net and stability.
Description
Technical field
The invention belongs to signal processing technology field, and in particular to a kind of Phase Lock Technique suitable for network deformation.
Background technology
In most of grid type power electronic equipments (such as wind electric converter, photovoltaic grid-connected device, active filter, static
Reactive-load compensator, direct current transportation inversion/rectifying valve etc.) in, it is to ensure grid-connected and operation security reliability, generally requires and pass through
Phase Lock Technique, the frequency of real-time detection electrical network fundamental voltage, phase place.And allow to occur in actual electric network certain imbalance and humorous
Ripple distorts, and adds more new energy power generation grid-connection devices in light current net, and Phase Lock Technique faces the challenge of electrical network distortion.
Many documents show[1], the traditional Phase Lock Technique converted based on d, q hydraulic performance decline, the frequency of detection, phase in network deformation
There is certain distortion in position.This causes the reference phase of coordinate transform to shift, and then makes the voltage/current after coordinate transform
D, q axle component deviates actual, the running quality of reduction grid type power electronic equipment, destroys the fortune of grid type power electronic equipment
Row is stable.Therefore Phase Lock Technique should be improved, it is ensured which also can accurately detect frequency, the phase place of fundamental voltage under network deformation.
Current document[2-5]It is based primarily upon following technology and improves Phase Lock Technique：1 separates positive and negative sequence voltage by coordinate transform；2 by prolonging
When separate positive and negative sequence voltage；3 pass through resonant controller compensation harmonic phase place；4 filter imbalance and harmonic wave using low pass filter
Voltage.Wherein 1,2 both of which are directed to unbalanced power grid, respectively by coordinate transform and time delay, remove the negative of line voltage
Order components, the q axle component of fundamental voltage is sent into pi regulator.Both approaches all can effectively eliminate negative phase-sequence under unbalanced power grid
The lock phase resultant error that component of voltage causes.But 1 operand of method is larger, be present larger time delay in method 2, and cannot all be applied to
Harmonic distortion electrical network.Method 3 passes through resonant controller compensation harmonic phase place, to eliminate specific subharmonic to fundamental frequency and phase place
The impact of detection.The method operand is little, but can only be directed to specific subharmonic network deformation.Method 4 then passes through a low pass
Wave filter, after filtering imbalance and the harmonic wave of line voltage q axle component, then the q axle component of fundamental voltage is sent into pi regulator.
The method can preferably be applied to network deformation, but the addition of low pass filter necessarily causes certain time delay, makes lock phase
Link response speed reduces.Need to seek a kind of Phase Lock Technique with very fast response speed and suitable for harmonic distortion electrical network.
Bibliography
[1] Wu Heng, Ruan Xinbo, Yang Dongsheng, impact of the phaselocked loop to LCL type combining inverter stability under weak grid conditions
Research and pll parameter design, Proceedings of the CSEE, on October 25th, 2014, the 30th phase of volume 34, pp:5259-
5268.
[2]. Zhou Peng, He Yikang, Hu Jiabing, voltage synchronous signal in running of wind generating set control under unbalanced power supply state
Detection, electrotechnics journal, in May, 2008, the 5th phase of volume 23, pp:108-113.
[3]. Gong Jinxia, Xie great, Zhang Yanchi, the principle of three-phase digital phaselocked loop and performance, electrotechnics journal, 2009 years
October, the 10th phase of volume 24, pp:94-99.
[4] Wang Haoxiong, Ma Weiming, Xiao Fei, etc., the Study on Mathematic Model of dual d-q transformation software phase-lock loop, electrotechnics
Report, in July, 2011, the 7th phase of volume 26, pp:238-241.
[5] Liu Yang, Tan Guojun, the answering in APF of the specific subharmonic backoff algorithm based on modified adaptive phase locked loop
With, electrotechnics journal, in May, 2013, the 5th phase of volume 28, pp：259-264.
Content of the invention
For the problems referred to above existing for prior art, the invention provides a kind of lock phase skill suitable for network deformation
Art, it is possible to increase system dynamic responding speed, and control all harmonic currents being likely to occur.
A kind of Phase Lock Technique suitable for network deformation, comprises the steps：
(1) electrical network three-phase voltage is gathered；
(2) converted by Park and determine that three-phase voltage rotates the d axle component in d-q coordinate system and q axle component in synchronous speed；
(3) the q axle component of voltage is passed through a proportional-plus-integral controller, detection obtains the frequency of electrical network fundamental voltage；
The frequency that detection is obtained is integrated by integrator, and detection obtains the phase place of electrical network A phase fundamental voltage；
(4) the q axle component of voltage is passed through a repetitive controller, repetitive controller is output as the compensation phase of harmonic voltage
Position；
(5) the fundamental voltage phase place of detection in (3) is added with the harmonic voltage compensation phase place in (4), as step (2)
In Park conversion fixed phase.
In described step (2), Park conversion is carried out according to following formula：
Wherein：Ua、UbAnd UcRespectively electrical network A phase, B phase and C phase voltage；UdAnd UqRespectively three-phase power grid voltage is in synchronization
D axle component and q axle component in speed rotation d-q coordinate system；The fixed phase that θ is converted for Park.
In described step (3), PI regulation is carried out according to following formula, detect the frequencies omega of electrical network fundamental voltage1；
Wherein：KpAnd KiThe proportionality coefficient for respectively giving and integral coefficient, s are Laplace operator.
It is integrated according to following formula, detects the phase theta of electrical network fundamental voltage1；
In described step (4), repetitive controller regulation is carried out according to following formula, obtain harmonic voltage compensation phase place
θh：
Wherein：krFor the Repetitive controller coefficient for giving, kfFor improving the given coefficient of Repetitive controller stability, s is La Pula
This operator, the T=0.02 second.
In described step (5), according to fixed phase θ of the Park conversion in following formula calculation procedure (2)：
θ=θ1+θh
The present invention can reduce, under the conditions of good dynamic response is ensured, the fundamental wave electricity caused due to electrical network distorted voltage
Voltage-frequency rate, the detection error of phase place, it is ensured that in actual network deformation, the correctness of fundamental voltage frequency and phase-detection, so as to
Guarantee stability and the security of grid type power electronic equipment, effectively improve the operation matter of power electronic equipment in actual electric network
Amount.The present invention adds the closed control loop based on repetitive controller in traditional phaselocked loop based on coordinate transform.Its
In, all wave frequency rate ,s that repetitive controller is adjusted are 50Hz, can greatly eliminate the lock that imbalance and random order harmonic voltage cause
Phase error, thus can accurately detect frequency and the phase information of electrical network fundamental voltage.
The present invention compares the side of existing employing low pass filter using the impact of repetitive controller harmonic carcellation voltage
Method, with faster dynamic response capability, reduces grid phase and changes the impact brought to the operation of grid type power electronic equipment.
Method detached with the positive and negative sequence based on changes in coordinates or time delay is compared, the present invention adopts repetitive controller, can not only eliminate
The adverse effect of unbalance voltage, moreover it is possible to the adverse effect of random order harmonic voltage.As actual electric network distortion is unpredictable, and
The present invention can tackle imbalance and any subharmonic network deformation.So no matter line voltage distortion what state, can be quick
And fundamental voltage frequency, phase place is accurately detected, it is a kind of Phase Lock Technique suitable for actual network deformation.
The inventive method is applied to various three-phase grid type power electronic equipments.
Description of the drawings
Fig. 1 (a) is the schematic diagram of the Phase Lock Technique based on resonant controller under existing non-ideal electrical network；
Fig. 1 (b) is the schematic diagram of the Phase Lock Technique based on low pass filter under existing non-ideal electrical network；
Fig. 2 is Phase Lock Technique schematic diagram proposed by the present invention；
Fig. 3 a (1)-(4) are the simulation waveform of the Phase Lock Technique under existing non-ideal electrical network based on resonant controller.
Fig. 3 b (1)-(4) are the simulation waveform of the Phase Lock Technique under existing non-ideal electrical network based on low pass filter.
Fig. 4 (1)-(4) are the simulation waveform of Phase Lock Technique proposed by the present invention.
Specific embodiment
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and specific embodiment " a kind of is suitable for the present invention
Phase Lock Technique in network deformation " is described in detail.
As shown in Fig. 2 a kind of Phase Lock Technique suitable for network deformation, comprises the steps：
1st, voltage hall sensor is utilized, gathers electrical network three-phase voltage；
2nd, determine that three-phase voltage rotates the d axle component in d-q coordinate system and q axle in synchronous speed by Park conversion module 1
Component, the formula of Park conversion are as follows：
Wherein：Ua、UbAnd UcRespectively electrical network A phase, B phase and C phase voltage；UdAnd UqRespectively three-phase power grid voltage is in synchronization
D axle component and q axle component in speed rotation d-q coordinate system, the fixed phase that θ is converted for Park.
3rd, proportion of utilization-integral controller module 2, the q axle component according to voltage detect electrical network fundamental voltage by following formula
Frequencies omega1：
Wherein：UqFor q axle component of the line voltage in synchronous speed rotation d-q coordinate system, ω1For detecting the electrical network for obtaining
The frequency of fundamental voltage, KpAnd KiThe proportionality coefficient for respectively giving and integral coefficient, s are Laplace operator.
Using integrator module 3, the frequencies omega of the fundamental voltage obtained according to detection1, by following formula
The phase theta of detection electrical network fundamental voltage1；
4th, repetitive controller module 4 is utilized, and the q axle component according to voltage calculates the compensation phase place of harmonic voltage by following formula
θh:
Wherein：θhPhase place, k are compensated for harmonic voltagerFor the Repetitive controller coefficient for giving, kfStable for improving Repetitive controller
Property given coefficient, s be Laplace operator, the T=0.02 second.
According to following formula, the fundamental voltage phase theta that detection is obtained1Phase theta is compensated with calculated harmonic voltagehIt is added,
Obtain the reference θ of Park conversion:
θ=θ1+θh
Wherein：θ is the fixed phase of the Park conversion in step 2.
We are respectively adopted existing Phase Lock Technique and proposed Phase Lock Technique is emulated below, respectively as Fig. 3, Fig. 4 institute
Show.In Fig. 3 a- (1), 3b- (1) and 4- (1), unbalanced source voltage distorts；In Fig. 3 a- (2), 3b- (2) and 4- (2), electrical network
5 subharmonic of voltage distorts；In Fig. 3 a- (3), 3b- (3) and 4- (3), 17 subharmonic of line voltage distorts；Fig. 3 a- (4), 3b- (4)
And in 4- (4), 21 subharmonic of line voltage distorts, and in 0.05 second moment, 60 ° of electrical network fundamental voltage phase hit.Fig. 3 is for
Phase Lock Technique simulation waveform under the non-ideal electrical network having：Fig. 3 a adopts the Phase Lock Technique based on resonant controller；Fig. 3 b is adopted
Phase Lock Technique based on low pass filter.Fig. 4 is Phase Lock Technique simulation waveform proposed by the present invention.
As shown in Figure 3 a, the Phase Lock Technique based on resonant frequency for the resonant controller of 300Hz is adopted, can be in line voltage
In the case of the distortion of 5 subharmonic (i.e. Fig. 3 a- (2)), frequency and the phase place of electrical network fundamental voltage is more accurately detected, detection
The frequency signal for going out is stable in 1.0p.u；And work as line voltage and uneven distortion occurs, shown in such as Fig. 3 a- (1), or electrical network electricity
When pressure 17 times, 21 subharmonic distort, i.e., as shown in Fig. 3 a- (3) and 3a- (4), the electrical network fundamental voltage frequency of detection and phase place are deposited
In error, the frequency signal for detecting is fluctuated up and down in 1.0 (p.u).This method can only be directed to specific subharmonic network deformation,
Harmonic wave actual electric network complicated and changeable cannot be adapted to.According to the Phase Lock Technique based on low pass filter, as shown in Figure 3 b, in electricity
In the case of net voltage distortion, the frequency of electrical network fundamental voltage and the error of phase place for detecting can be reduced；Voltage Harmonic
Distortion number of times is higher, and error is less；As shown in Fig. 3 b- (1), there is uneven distortion in line voltage, and the frequency of detection is 1.0
(p.u) fluctuate up and down larger, error is larger；As shown in Fig. 3 b- (2), when 5 subharmonic of line voltage distorts, the frequency of detection is deposited
In fluctuation, but amplitude has been reduced；With the increase of Voltage Harmonic distortion number of times, the frequency error for detecting gradually subtracts
Few, such as shown in Fig. 3 b- (3), under the distortion of 17 subharmonic of line voltage, the frequency signal for being detected is basically stable at 1.0
(p.u), error is substantially zeroed.The electrical network that this method can be distorted suitable for higher harmonics to a certain extent, but not
Can be suitably used for imbalance and low-order harmonic network deformation.Meanwhile, from Fig. 3 a- (4) and 3b- (4), the dynamic of two methods
Response is relatively slow, and in 60 ° of phase hit, stabilization time is respectively more than 0.2 second and 0.04 second.Carried using the present invention based on weight
The Phase Lock Technique of multiple controller, as shown in figure 4, no matter humorous in unbalanced source voltage, 5 subharmonic, 17 subharmonic or 21 times
In the case that ripple distorts, frequency and the phase place of electrical network fundamental voltage all can be precisely detected, the frequency signal of detection is stable 1.0
(p.u)；Meanwhile, such as shown in Fig. 4-(4), when 60 ° of electrical network fundamental voltage phase hit, it is only necessary to reach stable state within 0.02 second, have
Dynamic response capability faster.It can be seen that, the Phase Lock Technique is applied to uneven and arbitrarily subharmonic distortion actual electric network, has
General and universality, while also have preferable dynamic response capability.
Claims (4)
1. a kind of Phase Lock Technique suitable for network deformation, it is characterised in that the method specifically includes following steps：
(1) electrical network three-phase voltage is gathered；
(2) converted by Park and determine that three-phase voltage rotates the d axle component in d-q coordinate system and q axle component in synchronous speed；
(3) the q axle component of voltage is passed through a proportional-plus-integral controller, detection obtains the frequency of electrical network fundamental voltage；Will inspection
The frequency for measuring is integrated by integrator, and detection obtains the phase place of electrical network A phase fundamental voltage；
(4) the q axle component of voltage is passed through a repetitive controller, repetitive controller is output as the compensation phase place of harmonic voltage；
(5) the fundamental voltage phase place of detection in (3) is added with the harmonic voltage compensation phase place in (4), as in step (2)
The reference θ of Park conversion.
2. Phase Lock Technique according to claim 1, it is characterised in that：In described step (3), carried out according to following formula
PI is adjusted, and detects the frequencies omega of electrical network fundamental voltage1；
Wherein：UqFor q axle component of the line voltage in synchronous speed rotation d-q coordinate system, ω1For detecting the electrical network fundamental wave for obtaining
The frequency of voltage, KpAnd KiThe proportionality coefficient for respectively giving and integral coefficient, s are Laplace operator；
It is integrated according to following formula, detects the phase theta of electrical network fundamental voltage1；
3. Phase Lock Technique according to claim 1, it is characterised in that：In described step (4), carried out according to following formula
Repetitive controller is adjusted, and obtains harmonic voltage compensation phase thetah：
Wherein：θhPhase place, k are compensated for harmonic voltagerFor the Repetitive controller coefficient for giving, kfFor improving Repetitive controller stability
Given coefficient, s are Laplace operator, the T=0.02 second.
4. Phase Lock Technique according to claim 1, it is characterised in that：In described step (5), according to following formula calculation procedure
(2) fixed phase of the Park conversion in：
θ=θ1+θh
Wherein：θ is the fixed phase of the Park conversion in step (2)；
Park in step (2) is transformed to：
Wherein：Ua、UbAnd UcRespectively electrical network A phase, B phase and C phase voltage；UdAnd UqRespectively three-phase power grid voltage is revolved in synchronous speed
Turn the d axle component in d-q coordinate system and q axle component.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610824617.4A CN106487039A (en) | 2016-09-14 | 2016-09-14 | A kind of Phase Lock Technique suitable for network deformation |
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| CN201610824617.4A CN106487039A (en) | 2016-09-14 | 2016-09-14 | A kind of Phase Lock Technique suitable for network deformation |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333732A (en) * | 2019-07-22 | 2019-10-15 | 深圳市道通智能航空技术有限公司 | Horizontal stage electric machine control method and its device, holder and unmanned vehicle |
| CN110988449A (en) * | 2019-12-17 | 2020-04-10 | 西安西电电力***有限公司 | Analog quantity acquisition control method and device and analog quantity acquisition system |
| CN114243793A (en) * | 2021-11-12 | 2022-03-25 | 国网重庆市电力公司电力科学研究院 | Novel phase-locked loop suitable for VSC inserts under weak receiving end alternating current network |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2362515A1 (en) * | 2010-02-19 | 2011-08-31 | ABB Research Ltd | Control method for single-phase grid-connected LCL inverter |
| CN105743109A (en) * | 2016-04-19 | 2016-07-06 | 大连理工大学 | Phase-locked loop applicable to power grid voltage unbalance and distortion states |
-
2016
- 2016-09-14 CN CN201610824617.4A patent/CN106487039A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2362515A1 (en) * | 2010-02-19 | 2011-08-31 | ABB Research Ltd | Control method for single-phase grid-connected LCL inverter |
| CN105743109A (en) * | 2016-04-19 | 2016-07-06 | 大连理工大学 | Phase-locked loop applicable to power grid voltage unbalance and distortion states |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110333732A (en) * | 2019-07-22 | 2019-10-15 | 深圳市道通智能航空技术有限公司 | Horizontal stage electric machine control method and its device, holder and unmanned vehicle |
| CN110988449A (en) * | 2019-12-17 | 2020-04-10 | 西安西电电力***有限公司 | Analog quantity acquisition control method and device and analog quantity acquisition system |
| CN114243793A (en) * | 2021-11-12 | 2022-03-25 | 国网重庆市电力公司电力科学研究院 | Novel phase-locked loop suitable for VSC inserts under weak receiving end alternating current network |
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