CN105896597B - The photovoltaic grid-connected inverting control method of electric current static coordinate control - Google Patents
The photovoltaic grid-connected inverting control method of electric current static coordinate control Download PDFInfo
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- CN105896597B CN105896597B CN201610246522.9A CN201610246522A CN105896597B CN 105896597 B CN105896597 B CN 105896597B CN 201610246522 A CN201610246522 A CN 201610246522A CN 105896597 B CN105896597 B CN 105896597B
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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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
- 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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The present invention relates to the technical field of photovoltaic grid-connected inverting control method, especially a kind of photovoltaic grid-connected inverting control method of electric current static coordinate control, concrete operation step is：A. independent PLL locking phases are carried out to three-phase power grid voltage respectively first；B. then by obtaining lockin signal A_sin θ, the B_sin θ and C_sin θ of three-phase after closed loop PLL locking phases；C. three-phase current instantaneous values feedback independent control, last accurate output three-phase equilibrium electric current.The accurate locking phase of three-phase power grid voltage is realized using three-phase independence phase locked algorithm, realizes the control of three-phase current static coordinate, calculation amount is few, and inverter can accurately export three-phase equilibrium electric current in three-phase power grid voltage imbalance.
Description
Technical field
The present invention relates to the technical field of photovoltaic grid-connected inverting control method, especially a kind of electric current static coordinate control
Photovoltaic grid-connected inverting control method.
Background technology
In the control system of photovoltaic combining inverter, the general vector control algorithm using DQ conversions, voltage and current three
Phase static coordinate amount is transformed to DC quantity by Pack and Clark and is controlled, by can theoretically be realized after PI compensation controls
DAZ gene.When three-phase power grid voltage imbalance, result the problem of being not DC quantity of Pack and Clark transformation, need
Carry out complicated positive-negative sequence separation.Meanwhile locking phase and three-phase current control are required for simultaneously controlling positive sequence and negative phase-sequence,
Otherwise locking phase is inaccurate, and cannot export three-phase equilibrium electric current.
Invention content
The technical problem to be solved by the present invention is to：It is of the existing technology in above-mentioned background technology in order to solve the problems, such as,
A kind of photovoltaic grid-connected inverting control method of electric current static coordinate control is provided, three-phase electricity is realized using three-phase independence phase locked algorithm
The accurate locking phase of net voltage realizes the control of three-phase current static coordinate, and three-phase current instantaneous values feedback independent control, calculation amount is few,
And inverter can accurately export three-phase equilibrium electric current in three-phase power grid voltage imbalance.
The technical solution adopted by the present invention to solve the technical problems is：The photovoltaic grid-connected inversion of electric current static coordinate control
Control method, concrete operation step are as follows：
A. independent PLL locking phases are carried out to three-phase power grid voltage respectively first；
B. then by obtaining lockin signal A_sin θ, the B_sin θ and C_sin θ of three-phase after closed loop PLL locking phases.；
C. last accurate output three-phase equilibrium electric current.
Further specifically, in above-mentioned technical proposal, the electricity of one and primary voltage signal in orthogonal are constructed in the step a
Pressure, and the voltage signal of the construction lags primary voltage 90 degree of phases of signal.
The beneficial effects of the invention are as follows：The photovoltaic grid-connected inverting control method of electric current static coordinate control, realizes three-phase
Electric current directly controlled under static coordinate with the direct feedforward control of three-phase power grid voltage, realize that three-phase truly is independently controlled
System, greatly improves the control response speed and control accuracy of system, needs to carry out complicated positive-negative sequence point to solve vector controlled
From, the deficiency of extraction and control, a large amount of operation times are saved for dsp processor；Use lag 90 degree of phases of primary voltage signal
Realize that the closed loop phase lock algorithm of orthogonal signalling, algorithm are easily achieved, calculation amount is few, and locking phase dynamic property is good, Phase Tracking precision
Height, and current feedback Instantaneous Control is used in three-phase current closed-loop control, and three-phase current independent control, each phase electricity
Stream loop only needs a PI controller that three-phase current can be realized to be precisely controlled, and calculation amount is fewer than vector control algorithm very
It is more；Under any circumstance, including three-phase power grid voltage is uneven, network voltage arbitrarily mutually falls, low-voltage is worn for the control system
When more, inverter can accurately export three-phase equilibrium electric current.
Description of the drawings
Present invention will be further explained below with reference to the attached drawings and examples.
Fig. 1 is the independent phase locked algorithm flow chart of the present invention；
Fig. 2 is inversion control algorithm flow chart of the present invention.
Specific implementation mode
In conjunction with the accompanying drawings, the present invention is further explained in detail.These attached drawings are simplified schematic diagram, only with
Illustration illustrates the basic structure of the present invention, therefore it only shows the composition relevant to the invention.
The photovoltaic grid-connected inverting control method of electric current static coordinate control of the present invention, concrete operation step are as follows：
A. independent PLL locking phases are carried out to three-phase power grid voltage respectively first, for any one phase network voltage, using based on
The closed loop phase lock technology (see Fig. 1) of orthogonal signalling, dynamic property is good, high with grid phase tracking accuracy.However, based on orthogonal
The closed loop phase lock technology needs of signal just may be implemented according to a pair of orthogonal voltage signal, and any one phase network voltage is independently locked
There was only one voltage signal of phase voltage when phase, it is therefore desirable to the voltage of one and primary voltage signal in orthogonal are constructed, and this is constructed
Voltage signal need lag primary voltage 90 degree of phases of signal.
B. then by obtaining lockin signal A_sin θ, the B_sin θ and C_sin θ of three-phase after closed loop PLL locking phases；Such as
Fruit is vector controlled, and phaselocked loop needs the locking phase for carrying out positive sequence and negative sequence component to calculate, and calculation amount is complicated；With vector controlled
In the control system of algorithm, it is necessary first to carry out being converted to D axis component Id and Q axis component Iq to three-phase grid electric current, need simultaneously
Detached and extracted the positive and negative order components of D axis and the positive and negative order components of Q axis, it is therefore desirable to which two PI controllers are respectively to D
Control is adjusted in the positive sequence and negative sequence component of axis, it is also desirable to which two PI controllers adjust the positive and negative and negative sequence component of Q axis
Section control, calculation amount are considerably complicated.The present invention uses three-phase power grid voltage independence locking phase, three-phase grid closed-loop current control to belong to
Independent control, when adjusting idle Id_ref only need with Iq_ref to be added can synthesize the phase to constant current Iref, control
System only needs the grid-connected current feedback to every phase to make the difference the accurate tracking that the phase current can be realized by a PI controller
Control.
C. last accurate output three-phase equilibrium electric current.
See that Fig. 1, the delay process module of construction and the voltage signal of primary voltage signal in orthogonal, DSP sample network voltage letter
Number use points for N, then 90 degree of voltage signal of delay needs the array of N/4 element of definition, be stored in using stepping type
Primary voltage signal is to get to 90 degree of voltage signal of delay；Primary voltage signal is the Valpha of three phase static coordinate voltage, is prolonged
When 90 degree of voltage signal be Vbeta, be multiplied respectively with lockin signal sin θ and cos θ, do difference operation and pass through pi regulator
The regulated quantity Wp of angle signal is calculated, formula is as follows：Wp=-Valpha*cos θ-Vbeta*sin θ；Along with power frequency 50Hz
References angle Wo=314 i.e. obtain the actual tracking phase angle of network voltage, W=Wp+Wo；Locking phase letter is obtained after conversion
Number A_sin θ, B_sin θ and C_sin θ.
See Fig. 2, in grid-connection control system, busbar voltage outer shroud is for being calculated current amplitude given value, by busbar
Voltage reference value Vref makes the difference with busbar voltage sampled value Vbus, and three-phase current is calculated by bad pi regulator outside voltage
The given value Iref of d axis.Three-phase current d axis given values Iref respectively with three-phase independence lockin signal A_sin θ, B_sin θ and
C_sin θ are multiplied, and obtain three-phase current Setting signal Ia_ref, Ib_ref and Ic_ref；The given letter of three-phase current is used respectively
Number Ia_ref, Ib_ref and Ic_ref and three-phase grid current feedback Ia, Ib and Ic do difference operation, reuse three PI controllers
Control is compensated to three-phase grid electric current respectively, obtains Ia_out, Ib_out and Ic_out；By PI controllers three-phase simultaneously
The controlled quentity controlled variable of net electric current is added with corresponding phase voltage respectively, that is, introduces three-phase power grid voltage feedforward control, then calculate by SVPWM
Method is converted to space vector signal, then divided by busbar voltage just obtain final vector duty cycle signal, the vector duty cycle
Signal generates switching tube drive signal by the PWM module of DSP.
It is enlightenment with above-mentioned desirable embodiment according to the present invention, through the above description, relevant staff is complete
Various changes and amendments can be carried out without departing from the scope of the technological thought of the present invention' entirely.The technology of this invention
Property range is not limited to the contents of the specification, it is necessary to determine its technical scope according to right.
Claims (1)
1. the photovoltaic grid-connected inverting control method of electric current static coordinate control, it is characterised in that：Concrete operation step is as follows：
Step a. carries out independent PLL locking phases to three-phase power grid voltage respectively first；
The voltage of one and primary voltage signal in orthogonal, and the voltage signal lag primary voltage letter of the construction are constructed in the step a
Number 90 degree of phases；
Step b. and then lockin signal A_sin θ, B_sin θ and C_sin θ by obtaining three-phase after closed loop PLL locking phases；
Step c. three-phase current instantaneous values feedback independent controls, last accurate output three-phase equilibrium electric current.
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| CN201610246522.9A CN105896597B (en) | 2016-04-02 | 2016-04-02 | The photovoltaic grid-connected inverting control method of electric current static coordinate control |
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| CN112701719A (en) * | 2020-12-11 | 2021-04-23 | 深圳市英威腾电气股份有限公司 | Grid-connected soft start method, device, equipment and storage medium |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882799A (en) * | 2010-06-24 | 2010-11-10 | 上海交通大学 | Control method of alternating voltage sensorless high voltage direct current transmission converter |
| CN102412593A (en) * | 2011-11-02 | 2012-04-11 | 哈尔滨九洲电气股份有限公司 | Grid-connected generation control method for photovoltaic power generation converter |
| CN102709951A (en) * | 2012-05-26 | 2012-10-03 | 深圳市中兴昆腾有限公司 | Control system and control method of three-phase independent control grid inversion |
| CN102832840A (en) * | 2012-08-16 | 2012-12-19 | 卧龙电气集团股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882799A (en) * | 2010-06-24 | 2010-11-10 | 上海交通大学 | Control method of alternating voltage sensorless high voltage direct current transmission converter |
| CN102412593A (en) * | 2011-11-02 | 2012-04-11 | 哈尔滨九洲电气股份有限公司 | Grid-connected generation control method for photovoltaic power generation converter |
| CN102709951A (en) * | 2012-05-26 | 2012-10-03 | 深圳市中兴昆腾有限公司 | Control system and control method of three-phase independent control grid inversion |
| CN102832840A (en) * | 2012-08-16 | 2012-12-19 | 卧龙电气集团股份有限公司 | Compound control method of photovoltaic grid-connected inverter |
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