CN109149632A - A kind of single-phase photovoltaic inverter digital phase-locked loop control method - Google Patents
A kind of single-phase photovoltaic inverter digital phase-locked loop control method Download PDFInfo
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- H02J3/383—
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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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- 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
- H02J3/42—Synchronising a generator for connection to a network or to another generator with automatic parallel connection when synchronisation is achieved
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
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- 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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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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 present invention relates to single-phase photovoltaic inverter digital phase-locked loop control technology fields, disclose a kind of single-phase photovoltaic inverter digital phase-locked loop control method, by the discrete sine table for making a length of L of table；By modulus conversion chip, single-phase mains voltage signal is acquired, and is converted into digital quantity ug(k)；If input voltage signal is u (k), d (k), q (k) are calculated by difference equation；uα(k) and uβIt (k) is ugThe orthogonal signalling u under α β coordinate system is obtained by SOGI methodαAnd uβ, ud(k) it is the d axis component under the dp coordinate system that converts by Park, calculates ud(k) and etc., obtain phase information of the network voltage with frequency with phase.The case where present invention in the digital phase-locked loop based on synchronous rotating frame, improved by the link for generating orthogonal coordinate system to single-phase mains voltage, has been taken into account the detection accuracy and speed of single-phase phase-locked loop, while having been adapted to single-phase mains voltage distortion.
Description
Technical field
The present invention relates to single-phase photovoltaic inverter digital phase-locked loop control technology fields, more specifically, in particular to one
Kind single-phase photovoltaic inverter digital phase-locked loop control method.
Background technique
New energy distributed generation technology has become the hot spot of current development in science and technology.Photovoltaic power generation conduct is most clean
Generation of electricity by new energy mode, receives more and more attention, and from the supplement energy to alternative energy source transition, and finally occupies energy master
It leads status and has become inexorable trend.In the application field of photovoltaic power generation, distributed photovoltaic roof system, small scale, small investment, cleaning
Environmental protection, generation mode are flexible, have huge competitive advantage.Under normal circumstances, the electric power of resident is provided by single-phase power grid.
Therefore, the control technology of single-phase photovoltaic grid-connected inverter becomes one of the research emphasis of field of new energy generation.To single-phase light
When lying prostrate inverter progress cutting-in control, need to obtain the frequency and phase of single-phase mains voltage.
Currently, the PHASE-LOCKED LOOP PLL TECHNIQUE of most of single-phase photovoltaic grid-connected inverters by the way of hardware zero-crossing examination, is somebody's turn to do
Mode can not be applied to the serious occasion of harmonic pollution in electric power net, and must until the voltage zero-crossing point of power grid moment could to phase into
Row adjustment again, there are lag and delay.In three-phase system, the digital servo-control of synchronous coordinate rotation transformation can be taken based on
Ring has many advantages, such as that steady-state error is small, dynamic property is good, and has strong antijamming capability.But monophase system is due to only having one
Phase voltage cannot synchronize coordinate system conversion as three-phase system.Therefore, monophase system cannot be directly using based on synchronization
The Digital Phase-Locked Loop Technology of rotating coordinate system, so that the cutting-in control of single-phase photovoltaic grid-connected inverter is by a degree of system
About.
In monophase system, to realize the phase lock control based on synchronous rotating frame, change single-phase AC voltage
At DC quantity, Park coordinate transform is carried out, it is necessary to obtain the virtual orthographic voltage orthogonal with single-phase mains voltage first, that is, carry out
α β coordinate transform, i.e. Clark coordinate transform.
As shown in Figure 1, voltage vectorIt first has to be transformed into DC quantity, needs first to carry out Clark coordinate transform, obtain α β
X in coordinate systemαWith Xβ, then Park coordinate transform is carried out, obtain the DC component X in dq coordinate systemdWith Xq.Prior art side
In case, enabling single-phase mains voltage vector is the X in α β coordinate systemαComponent, orthogonal XβPass through, by XαComponent delay four is divided
A cycle obtain, that is, postpone 90 °, as shown in Figure 2.
Specific steps are as follows:
(1) firstly, the method for taking zero-crossing examination, measures the cycle T of tested sinusoidal signal X, and it is right to calculate cycle T institute
Answer the count value Cnt of timeslice；
(2) then, in dsp, successively the sampled value of current measured signal is stored in a queue；
(3) then, when count value reaches Cnt/4, ought time sampled value as XβOutput, will be first in the queue before Cnt/4
Sampled value is as XαOutput；
(4) according to sequence described above, it is sequentially output XαWith Xβ, Clark transformation can be realized.
The shortcomings that the prior art scheme, is as follows:
(1) there is delay in existing technical solution, i.e., tested magnitude X needs to export by a quarter power frequency period
XαWith Xβ。
(2) it during Digital Realization, needs to occupy the timer money in DSP using timer and digital queue
Source and memory source；
(3) if the sinusoidal quantity X of sampling distorts, or there are DC components, then the X obtained according to existing methodαWith Xβ
It will not be stringent orthogonality relation, therefore, this method is not suitable for network voltage and the occasion to distort occurs.
Summary of the invention
The purpose of the present invention is to provide a kind of single-phase photovoltaic inverter digital phase-locked loop control methods, based on synchronous rotation
Turn in the digital phase-locked loop of coordinate system, the link for generating orthogonal coordinate system to single-phase mains voltage is improved, and list has been taken into account
The detection accuracy and speed of phase phaselocked loop, while adapting to the case where single-phase mains voltage distorts.
The present invention is based on second order improper integral (SecondaryOrderGeneralizedIntegrator, SOGI), will be electric
Net voltage sinusoidal vector signal ug, generate orthogonal signalling uαWith uβ.The wherein mathematic(al) representation of SOGI are as follows:
Fig. 3 is the Bode diagram of formula (1) and formula (2), from Bode diagram as can be seen that vector for power grid power frequency, SOGI is to its width
Value is all without attenuation.And D (s) can be filtered network voltage vector, the only voltage vector component in power frequency 50Hz
Undamped it could pass through, the component of other frequencies will be all attenuated, also, D (s) acts on network voltage vector without phase shift.
And Q (s) can generate the phase shift of 90 ° of lag to the network voltage vector in power frequency, and it is undamped to its in amplitude.Therefore,
In numerical control system, the generation of virtual orthographic component can be realized using the SOGI of discretization, and there is certain filter
Wave effect.
To after Euler's discretization after being based on for formula (1) and formula (2), the expression formula of discrete domain is obtained:
Wherein, TsFor the discrete system sampling period.It enables input that formula (3) is converted into difference equation with formula (4) for u (k) to obtain:
Single-phase digital phase-locked loop Controlling model of the present invention is as shown in figure 4, ω in figureffFor the angular frequency that feedovers.Single-phase electricity
Net voltage signal ugThe orthogonal signalling u under α β coordinate system is obtained by SOGI methodαAnd uβ.It converts to obtain dq seat using Park
D axis component u under mark systemd, with its reference instruction ud* compare to obtain error e.Error e is adjusted by controller, is controlled
The integral of device output is exactly the phase of network voltage
If setting UmFor the amplitude of network voltage, enableFor the measured value of phaselocked loop, then the Park transformation in Fig. 4 is completed by following formula:
Wherein:
For the electrical angle of actual electric network, andTo originate initial phase angle, then ω is power grid fundamental frequency angular frequency.In order to realize locking phase control
System, can enable direct-axis component reference instruction ud *=0, the direct-axis component u with practical real-time grid voltagedIt is logical to subtract each other errors e
It crosses after controller is adjusted and makes udEqual to 0, i.e.,
After adjusting, with regard to the output valve of available phaselocked loop after the integrated link of the sum of controller output and feedforward angular frequency
Closed-loop control can makeLevel off to the practical phase angle theta of network voltage.Wherein, pi regulator progress can be used in the controller in Fig. 4
It adjusts.
The technical solution adopted by the invention is as follows:
A kind of single-phase photovoltaic inverter digital phase-locked loop control method, comprising the following steps:
Step 1, the discrete sine table of a length of L of table is made first；
Step 2, by modulus conversion chip, single-phase mains voltage signal is acquired, and is converted into digital quantity ug(k)；
Step 3, if input voltage signal is u (k), u (k)=u is enabledg(k), it is calculated by difference equationWherein Ts is the discrete system sampling period；
Step 4, u (k)=u is enabledg(k), it is calculated by difference equationWherein TsFor the discrete system sampling period；
Step 5, uα(k) and uβIt (k) is ugThe orthogonal signalling u under α β coordinate system is obtained by SOGI methodαAnd uβ, udIt (k) is warp
Cross the d axis component under the dp coordinate system that Park is converted.Enable uα(k)=d (k)；uβ(k)=q (k)；It obtainsWhereinFor the electrical angle of actual electric network, andTo originate initial phase angle, ω is power grid base
Frequency angular frequency UmFor the amplitude of network voltage,For the measured value of PLL.Calculate ud(k), wherein sinusoidalFor according to index value
Obtained by S_index is inquired in sine table, cosineFor according to obtained by being inquired in sine table according to index value C_index,
And there are following relationships: C_index=S_index+L/4 with cosine index value for sinusoidal index value；
Step 6, d axis component given value is ud *=0, with ugThe d axis component u converted through parkdSubtracting each other errors is e
(k)=0-ud(k)；
Step 7, e (k) is adjusted through pi regulator, and the output valve for obtaining pi regulator is p (k), in addition feedforward value ωff, and pass through
Integral is cumulative to obtain θ (k)；
Step 8, it assigns θ (k) to S_index, and does amplitude limiting processing, i.e. when θ (k) > L, θ (k)=0；
Step 9, the sine value and cosine value obtained according to S_index and C_index computation of table lookup is exactly with network voltage with frequency
With the phase information of phase.
Particularly, in 50Hz common frequency power network, class sets feedforward value ωff=100 π.
Tested using standard 220V network voltage, using the present invention, can rapidly (within 10ms) with accurately supervise
The phase of network voltage is measured, phase error is no more than 1 °.Using programmable power supply, injection is added in single-phase mains voltage
5% 3 subharmonic, 3% 5 subharmonic and 2% 7 subharmonic, this digital phase-locked loop remains to rapidly and accurately detect electricity
The phase of net voltage.
Fig. 6 shows no matter power grid is whether there is or not harmonic injection, and the locking phase precision of this phaselocked loop is attained by 0.4%, when locking phase
Between be respectively less than 1/10 period.
Compared with prior art, beneficial effects of the present invention are as follows:
1. the present invention uses broad sense Second Order Integral, network voltage is filtered, network voltage obtains near work frequency point
No gain passes through, and filters out to the component of voltage of non-frequency point, it is ensured that constructs the accuracy of orthogonal coordinate system, and several
It is no-delay；
It,, can be by power frequency frequency using its phase-shift characterisitc when generating virtual orthographic component 2. the present invention uses broad sense Second Order Integral
The component of rate point carries out 90 ° of accurate phase shift, and undamped；
3. the present invention carries out sliding-model control to broad sense Second Order Integral to Euler's discretization after, discretization process may make to become
While obtaining simple, the accuracy of discretization is kept.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the definition of d-q rotational coordinates and the transition diagram of the prior art；
Fig. 2 is that the delay method of the prior art realizes the schematic diagram of Clark transformation；
Fig. 3 is the Bode diagram of D (s) of the present invention Yu Q (s)；
Fig. 4 is the basic principle block diagram of the single-phase digital phase-locked loop of the present invention；
Fig. 5 is the flow chart of the single-phase digital phase-locked loop control of the present invention；
Fig. 6 is the test waveform figure using single-phase phase-locked loop of the invention.
Specific embodiment
The preferred embodiment of the present invention is described in detail with reference to the accompanying drawing, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
A kind of single-phase photovoltaic inverter digital phase-locked loop control method of the present invention, comprising the following steps:
Step 1, the discrete sine table of a length of L of table is made first；
Step 2, by modulus conversion chip, single-phase mains voltage signal is acquired, and is converted into digital quantity ug(k)；
Step 3, if input voltage signal is u (k), u (k)=u is enabledg(k), it is calculated by difference equationWherein Ts is the discrete system sampling period；
Step 4, u (k)=u is enabledg(k), it is calculated by difference equationWherein TsFor the discrete system sampling period；
Step 5, uα(k) and uβIt (k) is ugThe orthogonal signalling u under α β coordinate system is obtained by SOGI methodαAnd uβ, udIt (k) is warp
Cross the d axis component under the dp coordinate system that Park is converted.Enable uα(k)=d (k)；uβ(k)=q (k)；It obtainsWhereinFor the electrical angle of actual electric network, andTo originate initial phase angle, ω is power grid base
Frequency angular frequency UmFor the amplitude of network voltage,For the measured value of PLL.Calculate ud(k), wherein sinusoidalFor according to index value
Obtained by S_index is inquired in sine table, cosineFor according to obtained by being inquired in sine table according to index value C_index,
And there are following relationships: C_index=S_index+L/4 with cosine index value for sinusoidal index value；
Step 6, d axis component given value is ud *=0, with ugThe d axis component u converted through parkdSubtracting each other errors is e
(k)=0-ud(k)；
Step 7, e (k) is adjusted through pi regulator, and the output valve for obtaining pi regulator is p (k), in addition feedforward value ωff, and pass through
Integral is cumulative to obtain θ (k)；
Step 8, it assigns θ (k) to S_index, and does amplitude limiting processing, i.e. when θ (k) > L, θ (k)=0；
Step 9, the sine value and cosine value obtained according to S_index and C_index computation of table lookup is exactly with network voltage with frequency
With the phase information of phase.
Further, the feedforward value ωff=100 π.
If Fig. 5 is the flow chart for describing the method for the present invention.
Although the embodiments of the invention are described in conjunction with the attached drawings, but patent owner can be in appended claims
Within the scope of make various deformations or amendments, as long as it does not exceed the scope of protection described in the claims to the invention, all should
Within protection scope of the present invention.
Claims (2)
1. a kind of single-phase photovoltaic inverter digital phase-locked loop control method, comprising the following steps:
Step 1, the discrete sine table of a length of L of table is made first；
Step 2, by modulus conversion chip, single-phase mains voltage signal is acquired, and is converted into digital quantity ug(k)；
Step 3, if input voltage signal is u (k), u (k)=u is enabledg(k), it is calculated by difference equationWherein Ts is the discrete system sampling period；
Step 4, u (k)=u is enabledg(k), it is calculated by difference equation
Wherein TsFor the discrete system sampling period；
Step 5, uα(k) and uβIt (k) is ugThe orthogonal signalling u under α β coordinate system is obtained by SOGI methodαAnd uβ, udIt (k) is warp
Cross the d axis component under the dp coordinate system that Park is converted；Enable uα(k)=d (k)；uβ(k)=q (k)；It obtainsWhereinFor the electrical angle of actual electric network, andTo originate initial phase angle, ω is power grid base
Frequency angular frequency UmFor the amplitude of network voltage,For the measured value of PLL；Calculate ud(k), wherein sinusoidalFor according to index value
Obtained by S_index is inquired in sine table, cosineFor according to obtained by being inquired in sine table according to index value C_index,
And there are following relationships: C_index=S_index+L/4 with cosine index value for sinusoidal index value；
Step 6, d axis component given value is ud *=0, with ugThe d axis component u converted through parkdSubtracting each other errors is e (k)
=0-ud(k)；
Step 7, e (k) is adjusted through pi regulator, and the output valve for obtaining pi regulator is p (k), in addition feedforward value ωff, and pass through
Integral is cumulative to obtain θ (k)；
Step 8, it assigns θ (k) to S_index, and does amplitude limiting processing, i.e. when θ (k) > L, θ (k)=0；
Step 9, the sine value and cosine value obtained according to S_index and C_index computation of table lookup is exactly with network voltage with frequency
With the phase information of phase.
2. single-phase photovoltaic inverter digital phase-locked loop control method according to claim 1, it is characterised in that: the feedforward
Value ωff=100 π.
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| CN109742795A (en) * | 2019-01-10 | 2019-05-10 | 西北工业大学 | Single-phase grid-connected control method under virtual coordinate system based on SOGI |
| CN110601574A (en) * | 2019-09-11 | 2019-12-20 | 广西电网有限责任公司电力科学研究院 | Method for rapidly calculating virtual shaft voltage and current of single-phase grid-connected converter |
| CN112865019A (en) * | 2020-12-31 | 2021-05-28 | 常熟开关制造有限公司(原常熟开关厂） | Motor protection method and device in variable frequency loop |
| CN113394825A (en) * | 2021-06-30 | 2021-09-14 | 四川大学 | Grid-connected inverter orthogonal power synchronous control method under extremely weak power grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109742795A (en) * | 2019-01-10 | 2019-05-10 | 西北工业大学 | Single-phase grid-connected control method under virtual coordinate system based on SOGI |
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| CN110601574A (en) * | 2019-09-11 | 2019-12-20 | 广西电网有限责任公司电力科学研究院 | Method for rapidly calculating virtual shaft voltage and current of single-phase grid-connected converter |
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| CN112865019A (en) * | 2020-12-31 | 2021-05-28 | 常熟开关制造有限公司(原常熟开关厂） | Motor protection method and device in variable frequency loop |
| CN113394825A (en) * | 2021-06-30 | 2021-09-14 | 四川大学 | Grid-connected inverter orthogonal power synchronous control method under extremely weak power grid |
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