CN107561362A - A kind of SAI phase-locked loop methods suitable for non-ideal power network - Google Patents
A kind of SAI phase-locked loop methods suitable for non-ideal power network Download PDFInfo
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- CN107561362A CN107561362A CN201710789490.1A CN201710789490A CN107561362A CN 107561362 A CN107561362 A CN 107561362A CN 201710789490 A CN201710789490 A CN 201710789490A CN 107561362 A CN107561362 A CN 107561362A
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Abstract
The invention discloses a kind of SAI phase-locked loop methods suitable for non-ideal power network, extract three-phase power grid voltage, line voltage is transformed under α β coordinate systems by Clarke, positive sequence fundamental extraction is carried out to transforming to the voltage under α β coordinate systems with SAI adjusters, Park conversion is carried out to positive sequence fundamental wave, transformed under dq coordinate systems, pi regulator is passed through in the now output of q axles, the synchronous angular frequency of power network can be obtained, then after integration, obtains the phase angle of power network.The inventive method can not only carry out accurate Phase Tracking under grid balance state, to three-phase imbalance, Voltage Drop or rising sharply, under harmonic pollution and non-ideal power grid environment situations such as frequency hopping, the phase-locked loop method can accurately also obtain synchronized signal, the application of phaselocked loop has been widened significantly, improves the accuracy to synchronized signal trace.
Description
Technical field
It is especially a kind of to be applied to three-phase injustice the present invention relates to electronic power converter modulation and control field
Weighing apparatus, Voltage Drop rise sharply, the SAI PHASE-LOCKED LOOP PLL TECHNIQUEs of harmonic pollution and non-ideal power network situations such as frequency hopping.
Background technology
Track, the phase of locking AC signal, and may also provide the frequency of OFF signal and amplitude information when necessary to be
The major function of phaselocked loop.In PWM rectifier control, to realize that its net side active and reactive power controls, need dynamic access electric
Net voltage phase information, thus horizontal lock is entered to line voltage using phaselocked loop.In practical application, particularly advising greatly
Mould new energy grid-connected power occasion, often require that PWM rectifier adapts to non-ideal power grid environment (three-phase imbalance, Voltage Drop
Or rise sharply, harmonic pollution and frequency hopping) operation, this proposes higher technical performance to corresponding phase lock control will
Ask.It can be seen that one of the core of PHASE-LOCKED LOOP PLL TECHNIQUE as PWM rectifier control technology, its performance directly influences PWM rectifier
Cutting-in control performance.It is also one of main application of phaselocked loop in the harmonic detecting link of active filter.
In view of the importance of phaselocked loop, increasing scholar is studied it, it is proposed that the control of many phaselocked loops
System and design, so that the performance of phaselocked loop is also constantly improved and lifted.
When line voltage balances, line voltage only exists positive-sequence component, now traditional SRF-PLL can accurately with
The synchronizing signal of track line voltage, and when unbalanced source voltage because the introducing of negative sequence component, traditional SRF-PLL are just difficult
To obtain gratifying effect.The present invention carries phase-lock technique, can not only track the synchronization of line voltage in the state of the equilibrium
Signal, in three-phase imbalance, Voltage Drop or rise sharply, under the non-ideal power grid environment such as harmonic pollution and frequency hopping, the lock phase
Ring method can accurately also obtain synchronized signal, widened the application of phaselocked loop significantly, improved to synchronized
The accuracy of signal trace.
The content of the invention
Present invention aims at provide one kind for three-phase imbalance, Voltage Drop or rise sharply, the jump of harmonic pollution and frequency
The SAI phase-locked loop methods suitable for non-ideal power network of non-ideal power grid environment when change.
To achieve the above object, following technical scheme is employed：The method of the invention includes carrying for three-phase power grid voltage
Take, Clarke conversion, the extraction of positive sequence fundamental voltage, Park conversion, the application of pi regulator and integral element；Methods described includes
Following steps：
Step 1, power network three-phase voltage is extracted, by Clarke transform operations, obtains the voltage under α β coordinate systems；
Step 2, with the positive and negative sequence fundamental extraction links of SAI structures to transform to the voltage under α β coordinate systems carry out it is positive and negative
Sequence fundamental voltage extracts, and on the basis of higher harmonic voltage and Negative sequence harmonic voltage is eliminated completely, extracts positive sequence fundamental voltage；
Step 3, Park transform operations are carried out to the positive sequence fundamental voltage extracted, transformed under dq coordinate systems；
Step 4, the output of q axles in step 3, by pi regulator, the synchronous angular frequency of power network is obtained, then by integration
Afterwards, the phase angle of power network is obtained.
Further, the SAI structures described in step 2 are a kind of bandpass filters with polarity selection characteristic.
Compared with prior art, the invention has the advantages that：
1st, using SAI positive and negative sequence fundamental extraction link, the positive and negative sequence of voltage beyond voltage positive sequence fundametal compoment is removed
Harmonic wave on the basis of, form a kind of new phase-lock technique, accurately can not only obtain power network under three-phase equilibrium electric network state
Synchronizing signal, while in three-phase imbalance, Voltage Drop or can also rise sharply, when harmonic pollution and frequency hopping
Non-ideal power grid environment, accurately obtain the synchronizing signal of power network.
2nd, structure is simpler, and thinking is more visible, and operand is smaller, ageing preferable, function admirable.
Brief description of the drawings
Fig. 1 is overall structure block diagram of the present invention.
Fig. 2 is traditional SRF-PLL structured flowcharts.
Fig. 3 is positive sequence SAI structure charts.
Fig. 4 is SAI positive sequence fundamental wave amplitude versus frequency characte figures.
Fig. 5 is negative phase-sequence SAI structure charts.
Fig. 6 is SAI negative phase-sequence fundamental wave amplitude versus frequency characte figures.
Fig. 7 is positive-negative sequence separation principle figure of the present invention.
The positive sequence fundamental voltage that Fig. 8 is the present invention extracts structure chart.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
The inventive method adds positive and negative sequence fundamental voltage extraction link on the basis of SRF-PLL methods.Methods described
Content comprises the following steps：
Step 1, power network three-phase voltage is extracted, by Clarke transform operations, obtains the voltage under α β coordinate systems；
Step 2, with the positive and negative sequence fundamental extraction links of SAI structures to transform to the voltage under α β coordinate systems carry out it is positive and negative
Sequence fundamental voltage extracts, and on the basis of higher harmonic voltage and Negative sequence harmonic voltage is eliminated completely, extracts positive sequence fundamental voltage；
Step 3, Park transform operations are carried out to the positive sequence fundamental voltage extracted, transformed under dq coordinate systems；
Step 4, the output of q axles in step 3, by pi regulator, the synchronous angular frequency of power network is obtained, then by integration
Afterwards, the phase angle of power network is obtained.
Fig. 1 show overall structure block diagram of the present invention, and three-phase power grid voltage is extracted first, and line voltage passes through Clarke
Transform under α β coordinate systems, positive sequence fundamental extraction is carried out to transforming to the voltage under α β coordinate systems with SAI adjusters, to positive sequence base
Ripple carries out Park conversion, transforms under dq coordinate systems, pi regulator is passed through in the now output of q axles, can obtain the synchronization of power network
Angular frequency, then after integration, obtain the phase angle of power network.
Fig. 2 show traditional SRF-PLL structured flowcharts, and the three-phase power grid voltage of extraction is become by Clarke and Park
To change, transform under dq coordinate systems, pi regulator is passed through in the output of q axles, can obtain the synchronous angular frequency of power network, then by integration
Afterwards, the phase angle of power network is obtained.Fig. 1 institute's extracting methods added on the basis of Fig. 2 SRF-PLL methods SAI align, negative phase-sequence base
The link of wave voltage extraction, removes negative sequence voltage components in power network, obtains positive sequence fundamental voltage, the new phase-lock technique formed is not
The synchronizing signal of power network only can be accurately obtained under three-phase equilibrium electric network state, while also can be in three-phase imbalance, electricity
Pressure is fallen or risen sharply, the non-ideal power grid environment when harmonic pollution and frequency hopping, accurately obtains the synchronization of power network
Signal.
Fig. 3 show positive sequence SAI structure charts.Using the SAI extraction methods of positive sequence, the positive sequence fundametal compoment of voltage is carried
Take, positive sequence fundametal compoment is extracted in the composition complicated from power network, to realize that base has been established in the tracking of line voltage synchronizing signal
Plinth.
Fig. 4 show SAI positive sequence fundamental wave amplitude versus frequency characte figures.It is can be seen that by the amplitude versus frequency characte figure of positive sequence fundamental wave in central angle
There is resonance peak at frequency, all there is attenuation for the signal of other frequencies, there is pole for 50Hz positive-sequence component
Sexual behavior mode acts on.There is polarity selection just because of it, can be used for extracting positive sequence fundamental voltage.
Fig. 5 show the SAI schematic diagrams of negative phase-sequence fundamental wave.Similarly, can be to negative phase-sequence fundamental wave point using the SAI schematic diagrams of negative phase-sequence
Amount is extracted.
Fig. 6 show the amplitude versus frequency characte figure of negative phase-sequence fundamental wave.As ω=- 100 π, due to SAI for input signal for-
50Hz negative-sequence signals have the ability that polarity selects, and have filter action to the signal of other frequencies.Therefore SAI structures are one
Bandpass filter of the kind with polarity selection characteristic.
Fig. 7 show positive-negative sequence separation principle figure of the present invention.Positive-negative sequence isolating construction is by a series of SAI modules group
Into line voltage first carries out change of the abc coordinate systems to α β coordinate systems, recycles the polarity selection index system of SAI different frequencies
The positive and negative sequence voltage of frequency required for separation, extraction.In order to realize that a kind of SAI suitable for non-ideal power network locks in the present invention
Phase loop technique, voltage positive sequence fundamental wave isolating construction is only make use of under the α β axles in positive-negative sequence isolating construction to extract positive sequence base respectively
Wave voltage, the positive sequence fundamental voltage extracted can be carried out locking phase, so that institute's extracting method of the present invention may apply to three-phase
Uneven, Voltage Drop rises sharply, under the non-ideal power grid environment such as harmonic pollution.
Fig. 8 show the positive sequence fundamental voltage extraction structure chart of the present invention.As shown in Figure 8, to transforming to the electricity under α β axles
Net voltage carries out the extraction of positive and negative sequence fundamental wave respectively, on the basis of the positive sequence fundamental voltage extracted, subtracts the negative phase-sequence of extraction
Fundamental voltage, because SAI positive and negative sequence fundamental extraction link all shows as the form of bandpass filter, therefore remove positive sequence fundamental wave
Other positive and negative sequence harmonic voltages of voltage are filtered out in the extraction process of positive sequence fundamental voltage, with regard to that can obtain containing harmonic wave
Less positive sequence fundamental voltage, so as to enter horizontal lock, accurately line voltage synchronizing signal is compared in acquisition.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
The various modifications and improvement that case is made, it all should fall into the protection domain of claims of the present invention determination.
Claims (2)
1. a kind of SAI phase-locked loop methods suitable for non-ideal power network, it is characterised in that methods described includes three-phase power grid voltage
Extraction, Clarke conversion, the extraction of positive sequence fundamental voltage, Park conversion, the application of pi regulator and integral element；Methods described
Comprise the following steps：
Step 1, power network three-phase voltage is extracted, by Clarke transform operations, obtains the voltage under α β coordinate systems；
Step 2, positive and negative sequence base is carried out to transforming to the voltage under α β coordinate systems with the positive and negative sequence fundamental extraction link of SAI structures
Wave voltage extracts, and on the basis of higher harmonic voltage and Negative sequence harmonic voltage is eliminated completely, extracts positive sequence fundamental voltage；
Step 3, Park transform operations are carried out to the positive sequence fundamental voltage extracted, transformed under dq coordinate systems；
Step 4, the output of q axles in step 3, by pi regulator, the synchronous angular frequency of power network is obtained, then by integration
Afterwards, the phase angle of power network is obtained.
A kind of 2. SAI phase-locked loop methods suitable for non-ideal power network according to claim 1, it is characterised in that：Step 2
Described in SAI structures be it is a kind of with polarity selection characteristic bandpass filter.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617077A (en) * | 2019-01-22 | 2019-04-12 | 燕山大学 | A kind of total digitalization synchronized phase-lock technique |
| CN111273093A (en) * | 2020-02-25 | 2020-06-12 | 固德威电源科技(广德)有限公司 | Phase sequence identification and phase locking method for three-phase grid-connected inverter |
| CN112964932A (en) * | 2021-02-03 | 2021-06-15 | 大连理工大学 | Nonlinear auto-disturbance-rejection aircraft power grid phase angle tracker |
| CN113625066A (en) * | 2021-08-03 | 2021-11-09 | 国网北京市电力公司 | Distribution transformer phase unbalance detection method, system, device and storage medium |
| CN114123346A (en) * | 2021-11-22 | 2022-03-01 | 燕山大学 | Universal DFF-SAI phase locking method under positive sequence rotation coordinate system |
-
2017
- 2017-09-05 CN CN201710789490.1A patent/CN107561362A/en active Pending
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| 杜雄等: "采用正弦幅值积分器的单同步参考坐标系同步信号检测方法", 《电工技术学报》 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111273093A (en) * | 2020-02-25 | 2020-06-12 | 固德威电源科技(广德)有限公司 | Phase sequence identification and phase locking method for three-phase grid-connected inverter |
| CN111273093B (en) * | 2020-02-25 | 2022-05-10 | 固德威电源科技(广德)有限公司 | Phase sequence identification and phase locking method for three-phase grid-connected inverter |
| CN112964932A (en) * | 2021-02-03 | 2021-06-15 | 大连理工大学 | Nonlinear auto-disturbance-rejection aircraft power grid phase angle tracker |
| CN112964932B (en) * | 2021-02-03 | 2022-01-04 | 大连理工大学 | Nonlinear auto-disturbance-rejection aircraft power grid phase angle tracker |
| CN113625066A (en) * | 2021-08-03 | 2021-11-09 | 国网北京市电力公司 | Distribution transformer phase unbalance detection method, system, device and storage medium |
| CN113625066B (en) * | 2021-08-03 | 2023-11-21 | 国网北京市电力公司 | Distribution transformer phase unbalance detection method, system, device and storage medium |
| CN114123346A (en) * | 2021-11-22 | 2022-03-01 | 燕山大学 | Universal DFF-SAI phase locking method under positive sequence rotation coordinate system |
| CN114123346B (en) * | 2021-11-22 | 2023-06-09 | 燕山大学 | General DFF-SAI phase locking method under positive sequence rotation coordinate system |
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