CN108631305A - A kind of three-phase power grid voltage suitable for complex electric network operating mode tracks phase-lock technique - Google Patents

A kind of three-phase power grid voltage suitable for complex electric network operating mode tracks phase-lock technique Download PDF

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CN108631305A
CN108631305A CN201810479806.1A CN201810479806A CN108631305A CN 108631305 A CN108631305 A CN 108631305A CN 201810479806 A CN201810479806 A CN 201810479806A CN 108631305 A CN108631305 A CN 108631305A
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phase
voltage
output signal
power grid
sequence
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王要强
秦明
程显
王明东
海德伦
陈根永
王军
董亮辉
李忠文
周成龙
杜冠宇
吴莉莉
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Zhengzhou University
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Zhengzhou University
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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
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/01—Arrangements for reducing harmonics or ripples
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)

Abstract

The present invention relates to a kind of three-phase power grid voltages suitable for complex electric network operating mode to track phase-lock technique, and this method includes：Become the three-phase power grid voltage u that changes commanders using CLARKga、ugb、ugcThe network voltage u being transformed under two-phase stationary coordinate systemgα、ugβ；By ugα、ugβIt is sent into exchange integrating circuit, fundamental positive sequence u of the output network voltage under two-phase stationary coordinate systemgα+、ugβ+With fundamental wave negative sequence component ugα‑、ugβ‑；To ugα+、ugβ+PARK transformation is carried out, the fundamental positive sequence of network voltage in the two-phase synchronous rotating coordinate system is obtainedIt willWithAfter be sent into phase-locked loop filter；The output signal of phase-locked loop filter is feedovered by angular frequency after link, the input signal as phase-locked loop voltage controlled oscillator；Remainder processing is carried out to the output signal of voltage controlled oscillator, obtains the pursuit gain of grid voltage phase-angleBy pursuit gainIt is fed back in PARK transformation as synchro angle and constitutes closed loop.

Description

A kind of three-phase power grid voltage suitable for complex electric network operating mode tracks phase-lock technique
Technical field
The present invention is in transformation of electrical energy and new energy distributed grid-connected power field, and in particular to one kind being suitable for complex electric network The three-phase power grid voltage of operating mode tracks phase-lock technique.
Background technology
With increasingly serious, the new energy distributed grid-connected such as wind-power electricity generation, photovoltaic generation power generation of energy and environmental problem Technology is increasingly valued by people, and has become the important component of energy sustainable development strategy.Distributed grid-connected Electricity generation system is connected with power grid, and grid-connection control system needs the state current according to power grid to convey electricity to power grid by control algolithm Can, therefore accurate, the quick tracking of network voltage status information is necessary to distributed power generation cutting-in control process.Especially When three phase network has the complicated operating mode such as asymmetric, distortion, grid voltage waveform is non-sine, and there are negative sequence component, The factors such as the non-linear of grid voltage sensor, temperature drift can also influence the tracking locking phase of network voltage, and then influence distribution simultaneously The grid-connected effect of net electricity generation system, to reduce the waveform quality of grid-connected current.
In existing three-phase power grid voltage tracking phase locked algorithm, one is the zero passages that network voltage is obtained by comparing device Point, to calculate the phase residing for current electric grid voltage, but there are zero crossing overlapping phenomenons for this method, and cannot reflect The amplitude information of network voltage.Network voltage under two-phase stationary coordinate system is carried out arctangent cp cp operation can also obtain electricity in real time The phase angle of net voltage, but it is standard sine and symmetrical situation that this method, which is only applicable to three-phase power grid voltage, cannot inhibit electricity The influence of non-ideal factor under net complex working condition.Under three-phase static coordinate system and two synchronous rotating frames, to three-phase electricity Net voltage synchronizes locking phase, can obtain the information such as phase angle, amplitude and the frequency of network voltage, and this method is because it closes Ring property makes its output result more reliable, but still cannot solve network voltage and exist under the complex working conditions such as asymmetric, distortion Factor, increase filter factor can alleviate the influence of these factors to a certain extent, but can reduce network voltage synchronize with The bandwidth of track phase locked algorithm.In addition, also there is the power grid electricity based on control algolithms such as wavelet transformation, Kalman filtering, neural networks Pressure tracking phase locked algorithm, but these algorithms, compared with the present invention, process is relative complex, affects it to a certain extent and is dividing Popularization in the engineering practices such as cloth generates electricity by way of merging two or more grid systems, Active Power Filter-APF, reacance generator.
Invention content
The present invention is for existing network voltage phase-lock technique to the more complex power grid adaptability for working condition difference such as uneven, distortion Problem provides a kind of three-phase voltage tracking phase-lock technique suitable for complex electric network operating mode.To achieve the above object, of the invention The technical solution adopted is that：
A kind of three-phase power grid voltage suitable for complex electric network operating mode tracks phase-lock technique, and this approach includes the following steps：
Step 1, acquisition three-phase power grid voltage uga、ugb、ugc, become the u that changes commanders using CLARKga、ugb、ugcIt is transformed to α, β two-phase Network voltage u under rest framegα、ugβ；
Step 2, by ugα、ugβIt is sent into exchange integrating circuit, base of the output network voltage under α, β two-phase stationary coordinate system Wave positive-sequence component ugα+、ugβ+With fundamental wave negative sequence component ugα-、ugβ-；
Step 3 is exported with phase-locked loopFor synchro angle, to ugα+、ugβ+PARK transformation is carried out, obtains network voltage two The fundamental positive sequence being synchronised under rotating coordinate system
Step 4, setting amplitude are givenIt willWithAfter be sent into phase-locked loop filter；
Step 5, the output signal of phase-locked loop filter are shaken after angular frequency feedovers link as phase-locked loop is voltage-controlled Swing the input signal of device；
Step 6, using 2 π as divisor, remainder processing is carried out to the output signal of voltage controlled oscillator, obtains grid voltage phase-angle Pursuit gainBy pursuit gainIt is fed back in PARK transformation as synchro angle and constitutes closed loop.
Based on above-mentioned, the CLARK transformation for mula in step 1 is：
Based on above-mentioned, the course of work that integrating circuit is exchanged in step 2 is：
Step 21, by network voltage α axis components ugαWith exchange integrating circuit output signal α axis components ugα+、ugα-After comparing Obtain α axis deviation signals ugαe；
By network voltage beta -axis component ugβWith exchange integrating circuit output signal beta -axis component ugβ+、ugβ-After obtain β axis Deviation signal ugβe；
Step 22, with network voltage α, β axis deviation signal ugαe、ugβeFor input signal, it is respectively connected to positive sequence exchange integral Unit exchanges integral unit with negative phase-sequence；
Step 23, the two-way output signal for exchanging positive sequence integral unit carry out ratio enlargement, obtain network voltage in α, β Fundamental positive sequence u under two-phase stationary coordinate systemgα+、ugβ+；
The two-way output signal for exchanging negative phase-sequence integral unit carries out ratio enlargement, obtains network voltage in the static seat of two-phase Fundamental wave negative sequence component u under mark systemgα-、ugβ-；
Step 24, to exchange the output signal u of integrating circuitgα+、ugα+、ugβ+、ugβ-To exchange the feedback letter of integrating circuit Number constitute complete closed loop.
Based on above-mentioned, the frequency domain equation of the positive sequence exchange integral unit is
The frequency domain equation of negative phase-sequence exchange integral unit is
Wherein, Xα+、Xβ+The respectively input signal of positive sequence exchange integral unit；Yα+、Yβ+Respectively positive sequence exchange integral is single The output signal of member；Xα-、Xβ-The respectively input signal of negative phase-sequence exchange integral unit；Yα-、Yβ-Respectively negative phase-sequence exchange integral is single The output signal of member；S is the frequency of input, phase of output signal variation；ω1For the angular frequency of each operator, it is set as 100 π.
Based on above-mentioned, the PARK transformation for mula in step 3 is：
Based on above-mentioned, phase-locked loop filter is PI links in step 4, and expression formula is
Based on above-mentioned, in step 5 the selection of angular frequency feed-forward signal be subject to network voltage angular frequency, ωf=100 π； Voltage controlled oscillator is pure integral element, expression formula 1/s.
The present invention has substantive distinguishing features outstanding and marked improvement compared with the prior art, specifically, provided by the present invention Three-phase power grid voltage track phase-lock technique, can effectively inhibit the harmonic wave of network voltage and negative phase-sequence ingredient under complex electric network operating mode Interference is suitable for network voltage and there is distortion, the more complicated operating mode such as asymmetry, enhances new energy grid-connected power system, quiet Only adaptability of the reacance generator under more complex operating mode, or the Harmonic Detecting Algorithm in active filter provides ginseng It examines.
Description of the drawings
Fig. 1 is the structure diagram of the method for the present invention.
Fig. 2 is exchange integrating circuit involved in Fig. 1.
Fig. 3 is that positive sequence involved in Fig. 2 exchanges integral unit.
Fig. 4 is that negative phase-sequence involved in Fig. 2 exchanges integral unit.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in the embodiment of the present invention Technical solution is clearly completely described：
As shown in Figure 1, a kind of three-phase power grid voltage suitable for complex electric network operating mode tracks phase-lock technique, feature exists In this approach includes the following steps：
Step 1, acquisition three-phase power grid voltage uga、ugb、ugc, become the u that changes commanders using CLARKga、ugb、ugcIt is transformed to α, β two-phase Network voltage u under rest framegα、ugβ；Wherein, CLARK transformation for mula is：
Step 2, by ugα、ugβIt is sent into exchange integrating circuit, base of the output network voltage under α, β two-phase stationary coordinate system Wave positive-sequence component ugα+、ugβ+With fundamental wave negative sequence component ugα-、ugβ-；
Step 3 is exported with phase-locked loopFor synchro angle, to ugα+、ugβ+Carry out PARK transformation, obtain network voltage α, Fundamental positive sequence under β two-phase synchronous rotating framesWherein, PARK transformation for mula is：
Step 4, setting amplitude are givenIt willWithAfter be sent into phase-locked loop filter；Wherein, phaselocked loop Path filter is PI links, and expression formula is
Step 5, the output signal of phase-locked loop filter are shaken after angular frequency feedovers link as phase-locked loop is voltage-controlled Swing the input signal of device；Wherein, network voltage angular frequency is subject in the selection of angular frequency feed-forward signal, ωf=100 π；It is voltage-controlled to shake It is pure integral element, expression formula 1/s to swing device；
Step 6, using 2 π as divisor, remainder processing is carried out to the output signal of voltage controlled oscillator, obtains grid voltage phase-angle Pursuit gainBy pursuit gainIt is fed back in PARK transformation as synchro angle and constitutes closed loop.
The reciprocal step 1 that executes is to step 6, you can realizes the continuous service of three-phase power grid voltage synchronized tracking phase-lock technique.
In other embodiments, as in Figure 2-4, the course of work of exchange integrating circuit is in step 2：
Step 21, by network voltage α axis components ugαWith exchange integrating circuit output signal α axis components ugα+、ugα-After comparing Obtain α axis deviation signals ugαe；
By network voltage beta -axis component ugβWith exchange integrating circuit output signal beta -axis component ugβ+、ugβ-After obtain β axis Deviation signal ugβe；
Step 22, with network voltage α, β axis deviation signal ugαe、ugβeFor input signal, it is respectively connected to positive sequence exchange integral Unit exchanges integral unit with negative phase-sequence；
Step 23, the two-way output signal for exchanging positive sequence integral unit carry out ratio enlargement, obtain network voltage in α, β Fundamental positive sequence u under two-phase stationary coordinate systemgα+、ugβ+；
The two-way output signal for exchanging negative phase-sequence integral unit carries out ratio enlargement, obtains network voltage in the static seat of two-phase Fundamental wave negative sequence component u under mark systemgα-、ugβ-；
Specifically, the frequency domain equation of the positive sequence exchange integral unit is
The frequency domain equation of negative phase-sequence exchange integral unit is
Wherein, Xα+、Xβ+The respectively input signal of positive sequence exchange integral unit；Yα+、Yβ+Respectively positive sequence exchange integral is single The output signal of member；Xα-、Xβ-The respectively input signal of negative phase-sequence exchange integral unit；Yα-、Yβ-Respectively negative phase-sequence exchange integral is single The output signal of member；S is the frequency of input, phase of output signal variation；ω1For the angular frequency of each operator, it is set as 100 π；
Step 24, to exchange the output signal u of integrating circuitgα+、ugα+、ugβ+、ugβ-To exchange the feedback letter of integrating circuit Number, according to this back and forth, constitute complete Closed loop track locking phase control system.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be apparent to an ordinarily skilled person in the art that：It is still Can be with technical scheme described in the above embodiments is modified, or which part technical characteristic is equally replaced It changes；And these modifications or replacements, do not make technical solution essence be detached from various embodiments of the present invention technical solution spirit and Range.

Claims (7)

1. a kind of three-phase power grid voltage suitable for complex electric network operating mode tracks phase-lock technique, which is characterized in that this method includes Following steps：
Step 1, acquisition three-phase power grid voltage uga、ugb、ugc, become the u that changes commanders using CLARKga、ugb、ugcIt is static to be transformed to α, β two-phase Network voltage u under coordinate systemgα、ugβ；
Step 2, by ugα、ugβIt is sent into exchange integrating circuit, fundamental positive sequence of the output network voltage under α, β two-phase stationary coordinate system Component ugα+、ugβ+With fundamental wave negative sequence component ugα-、ugβ-；
Step 3 is exported with phase-locked loopFor synchro angle, to ugα+、ugβ+PARK transformation is carried out, obtains network voltage in α, β two-phase Fundamental positive sequence under synchronous rotating frame
Step 4, setting amplitude are givenIt willWithAfter be sent into phase-locked loop filter；
Step 5, the output signal of phase-locked loop filter are after angular frequency feedovers link, as phase-locked loop voltage controlled oscillator Input signal；
Step 6, using 2 π as divisor, remainder processing is carried out to the output signal of voltage controlled oscillator, obtain grid voltage phase-angle with Track valueBy pursuit gainIt is fed back in PARK transformation as synchro angle and constitutes closed loop.
2. the three-phase power grid voltage according to claim 1 suitable for complex electric network operating mode tracks phase-lock technique, feature It is, the CLARK transformation for mula in step 1 is：
3. the three-phase power grid voltage according to claim 1 suitable for complex electric network operating mode tracks phase-lock technique, feature It is, the course of work that integrating circuit is exchanged in step 2 is：
Step 21, by network voltage α axis components ugαWith exchange integrating circuit output signal α axis components ugα+、ugα-After obtain α Axis deviation signal ugαe；
By network voltage beta -axis component ugβWith exchange integrating circuit output signal beta -axis component ugβ+、ugβ-After obtain β axis deviations Signal ugβe；
Step 22, with network voltage α, β axis deviation signal ugαe、ugβeFor input signal, it is respectively connected to positive sequence exchange integral unit Integral unit is exchanged with negative phase-sequence；
Step 23, the two-way output signal for exchanging positive sequence integral unit carry out ratio enlargement, obtain network voltage in α, β two-phase Fundamental positive sequence u under rest framegα+、ugβ+；
The two-way output signal for exchanging negative phase-sequence integral unit carries out ratio enlargement, obtains network voltage in two-phase stationary coordinate system Under fundamental wave negative sequence component ugα-、ugβ-；
Step 24, to exchange the output signal u of integrating circuitgα+、ugα+、ugβ+、ugβ-To exchange the feedback signal structure of integrating circuit At complete closed loop.
4. the three-phase power grid voltage according to claim 3 suitable for complex electric network operating mode tracks phase-lock technique, feature It is：
The frequency domain equation of positive sequence exchange integral unit is
The frequency domain equation of negative phase-sequence exchange integral unit is
Wherein, Xα+、Xβ+The respectively input signal of positive sequence exchange integral unit；Yα+、Yβ+Respectively positive sequence exchanges integral unit Output signal；Xα-、Xβ-The respectively input signal of negative phase-sequence exchange integral unit；Yα-、Yβ-Respectively negative phase-sequence exchanges integral unit Output signal；S is the frequency of input, phase of output signal variation；ω1For the angular frequency of each operator, it is set as 100 π.
5. the three-phase power grid voltage according to claim 1 suitable for complex electric network operating mode tracks phase-lock technique, feature It is, the PARK transformation for mula in step 3 is：
6. the three-phase power grid voltage according to claim 1 suitable for complex electric network operating mode tracks phase-lock technique, feature It is：Phase-locked loop filter is PI links in step 4, and expression formula is
7. the three-phase power grid voltage according to claim 1 suitable for complex electric network operating mode tracks phase-lock technique, feature It is：Network voltage angular frequency is subject in the selection of angular frequency feed-forward signal in step 5, ωf=100 π；Voltage controlled oscillator is Pure integral element, expression formula 1/s.
CN201810479806.1A 2018-05-18 2018-05-18 A kind of three-phase power grid voltage suitable for complex electric network operating mode tracks phase-lock technique Pending CN108631305A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109358228A (en) * 2018-11-09 2019-02-19 哈工大（张家口）工业技术研究院 The positive and negative order components real-time estimation method of network voltage based on double enhanced phaselocked loops
CN109617077A (en) * 2019-01-22 2019-04-12 燕山大学 A kind of total digitalization synchronized phase-lock technique
CN110702987A (en) * 2019-10-31 2020-01-17 科华恒盛股份有限公司 System for extracting positive and negative sequence fundamental wave components of power grid voltage signal
CN110768666A (en) * 2019-10-28 2020-02-07 南京工程学院 Kalman filter-based double-synchronous coordinate system decoupling phase-locked loop system and method
CN112671398A (en) * 2020-12-08 2021-04-16 东北大学 Non-sinusoidal periodic signal phase locking method and system
CN114778928A (en) * 2022-03-25 2022-07-22 深圳库马克科技有限公司 Detection method and detection device for power grid voltage

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109358228A (en) * 2018-11-09 2019-02-19 哈工大（张家口）工业技术研究院 The positive and negative order components real-time estimation method of network voltage based on double enhanced phaselocked loops
CN109358228B (en) * 2018-11-09 2020-12-15 哈工大（张家口）工业技术研究院 Power grid voltage positive and negative sequence component real-time estimation method based on double enhanced phase-locked loops
CN109617077A (en) * 2019-01-22 2019-04-12 燕山大学 A kind of total digitalization synchronized phase-lock technique
CN109617077B (en) * 2019-01-22 2020-05-29 燕山大学 Full-digital power grid synchronous phase locking method
CN110768666A (en) * 2019-10-28 2020-02-07 南京工程学院 Kalman filter-based double-synchronous coordinate system decoupling phase-locked loop system and method
CN110702987A (en) * 2019-10-31 2020-01-17 科华恒盛股份有限公司 System for extracting positive and negative sequence fundamental wave components of power grid voltage signal
CN112671398A (en) * 2020-12-08 2021-04-16 东北大学 Non-sinusoidal periodic signal phase locking method and system
CN114778928A (en) * 2022-03-25 2022-07-22 深圳库马克科技有限公司 Detection method and detection device for power grid voltage

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