CN105514972B - The PSCAD modelings of grid-connected converter and emulation mode during unbalanced grid faults - Google Patents
The PSCAD modelings of grid-connected converter and emulation mode during unbalanced grid faults Download PDFInfo
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Classifications
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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
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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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
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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
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The PSCAD modelings of grid-connected converter and emulation mode, belong to PSCAD modelings and emulation mode technical field during unbalanced grid faults of the present invention；The technical problem of solution is：A kind of PSCAD modelings for realizing grid-connected converter under positive and negative double sequence independent control strategies and emulation mode are provided；The technical scheme used for：The three-phase voltage current of grid-connected converter AC is led to the separation of positive-negative sequence voltage x current first, by three-phase positive sequence and negative sequence voltage current transformation to α β axles, the reference value of positive-negative sequence current dq axles is obtained, calculates the PI parameters of current inner loop and outer voltage；Suitable for power system.
Description
Technical field
During unbalanced grid faults of the present invention grid-connected converter PSCAD modeling and emulation mode, belong to PSCAD modeling and
Emulation mode technical field.
Background technology
Will being realized by PWM converter for the element of current numerous non-power frequencies of output frequency is grid-connected, such as photovoltaic generation
System, straight drive blower etc., when unbalanced fault occurs for power network, according to instantaneous power theory, the AC of grid-connected converter
Active and reactive power contains second harmonic component, while DC side busbar voltage can also have secondary ripple wave, when ripple is enough
When big, it will the normal operation of current transformer, or even infringement current transformer are influenceed, in order to limit the line of current transformer DC bus-bar voltage
Ripple, a kind of double-current ring control strategy of positive-negative sequence independent control are widely applied, in order to preferably analyze such a control plan
Slightly descend the characteristic of grid-connected converter, it is necessary to which its modeling method is studied.
The content of the invention
The present invention overcomes the shortcomings of the prior art, and technical problem to be solved is：One kind is provided and realizes grid-connected change
Flow PSCAD modeling and emulation mode of the device under positive and negative double sequence independent control strategies.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is：Grid-connected converter during unbalanced grid faults
The PSCAD modelings of device and emulation mode, comprise the following steps：
The three-phase voltage current of grid-connected converter AC is subjected to positive-negative sequence separation；
Positive sequence and negative sequence voltage electric current are transformed into α β axles by Clark, positive-negative sequence is pinned by three-phase phase-locked loop
The phase of voltage, then the voltage current transformation for α β axles of changing commanders is become to dq rotatable coordinate axis by park；
According to the control targe of limitation DC side busbar voltage ripple, the requirement run with reference to current transformer unit power, ask
Obtain the reference value of positive-negative sequence current dq axles；
By trying to achieve the transmission function of outer voltage and current inner loop, the parameter tuning method of 5 pi regulators is provided；It is logical
Cross the overvoltage of discharging circuit limitation dc bus；The final positive-negative sequence independent control for realizing grid-connected converter and limitation direct current are female
Line voltage ripple.
Further, following steps are specifically included：
Step S1：The three-phase voltage current of grid-connected converter AC is realized into positive-negative sequence voltage x current by phase shift
Separation：
In formula (1)：P represents positive sequence, N represents negative phase-sequence；A, b, c represent A, B, C three-phase respectively；F represents voltage or electric current；α
For rotor, wherein α=ej2π/3；
Step S2：Change commanders three-phase positive sequence and negative sequence voltage current transformation are become to α β axles by clark, obtained And the phase of positive and negative sequence voltage is pinned by phaselocked loop；The positive and negative of α β axles of changing commanders is become by park again
Sequence voltage transforms to dq rotatable coordinate axis：
Thus can realize：
In formula (2),The voltage or electric current of expression α axle positive sequences,The voltage or electric current of expression β axle positive sequences,Represent α
The voltage or electric current of axle negative phase-sequence,Represent the voltage or electric current of β axle negative phase-sequences；θ is the phase angle for the positive sequence voltage that phaselocked loop obtains；For AC positive sequence voltage amplitude,For AC negative sequence voltage amplitude；
In formula (3),The d axles and q axis components of respectively positive and negative sequence voltage；
Step S3：The reference value of positive-negative sequence current dq axles is obtained according to formula (4)：
In formula (4),The reference value of positive and negative sequence electric current d axles and q axis components is represented respectively；
The active power reference value obtained for DC voltage outer shroud, it is specially：
In formula (5),For DC bus-bar voltage reference value, udcFor DC bus-bar voltage, kvpFor the ratio system of Voltage loop
Number, kviFor the integral coefficient of Voltage loop.
Step S4：4 PI parameters in current inner loop are obtained by formula (6), obtained by formula (7) 1 in outer voltage
Individual PI parameters：
In formula (6), kipFor the proportionality coefficient of electric current loop, kiiFor the integral coefficient of electric current loop；R, L is net side filter inductance
Equivalent electric resistance and inductance；KPWMFor the equivalent gain of PWM converter；TSThe sampling period of simulation model；
In formula (7), C is the electric capacity of dc bus.
Realize the delay of rotor in step S1 by the delay cell in PSCAD, in step S2, phaselocked loop is in PSCAD
Realized with PLL elements.
The present invention has the advantages that compared with prior art：
1st, the PSCAD modelings of grid-connected converter and emulation mode during unbalanced grid faults of the present invention, it is secondary in order to limit
Influence of the ripple to current transformer, the present invention are not only able to effectively limit active power and the secondary ripple wave of DC bus-bar voltage,
So as to improve the operational efficiency of current transformer, and the low voltage ride-through capability of inverse distributed power can be improved.
2nd, of the invention, with PSCAD simulation softwares, PSCAD simulation softwares are with easy-to-use graphical interfaces directly perceived and accurately
Efficient simulation, AC and DC power system problem can be both studied, and can completes power electronic devices emulation and nonlinear Control,
The present invention gives the separation of positive-negative sequence and orientation, positive and negative sequence voltage in the double sequence independent controls of positive sequence by PSCAD simulation softwares
The implementation method of the important steps such as the calculating of reference value, the regulation of PI parameters, finally realize grid-connected converter positive and negative double
Emulation under sequence independent control strategy, effectively inhibit the ripple of DC side busbar voltage and AC active power, this hair
Bright method provides theoretical foundation for the modeling and simulation of the grid-connected power generation system under power network asymmetrical.
Brief description of the drawings
The present invention will be further described in detail below in conjunction with the accompanying drawings；
Fig. 1 is the topological structure schematic diagram of grid-connected converter；
Fig. 2 is the positive-negative sequence independent control strategy block diagram of grid-connected converter；
Fig. 3 is the additional control circuit schematic diagram of limitation dc bus overvoltage；
Fig. 4 is AC three-phase positive sequence voltage schematic diagram；
Fig. 5 is AC three-phase negative/positive V diagram；
Fig. 6 is AC three-phase forward-order current schematic diagram；
Fig. 7 is AC three-phase negative/positive current diagram；
Fig. 8 is the positive and negative sequence voltage dq axis component schematic diagrames of AC；
Fig. 9 is AC positive-negative sequence current dq axis component schematic diagrames；
Figure 10 is AC active power and reactive power schematic diagram；
Figure 11 is DC side busbar voltage schematic diagram.
Embodiment
As shown in Figure 1 to 11, the PSCAD modelings of grid-connected converter and emulation mode during unbalanced grid faults, including
Following steps：
The three-phase voltage current of grid-connected converter AC is realized into positive-negative sequence voltage x current by phase shift first
Separation；
Positive sequence and negative sequence voltage electric current are transformed into α β axles by Clark, positive-negative sequence is pinned by three-phase phase-locked loop
The phase of voltage, then the voltage current transformation for α β axles of changing commanders is become to dq rotatable coordinate axis by park；
According to the control targe of limitation DC side busbar voltage ripple, the requirement run with reference to current transformer unit power, ask
Obtain the reference value of positive-negative sequence current dq axles；
By trying to achieve the transmission function of outer voltage and current inner loop, the parameter tuning method of 5 pi regulators is provided；It is logical
Cross the overvoltage of discharging circuit limitation dc bus；The final positive-negative sequence independent control for realizing grid-connected converter and limitation direct current are female
Line voltage ripple.
Specifically include following steps：
Step S1：The three-phase voltage current of grid-connected converter AC is realized into positive-negative sequence voltage x current by phase shift
Separation：
In formula (1)：P represents positive sequence, N represents negative phase-sequence；A, b, c represent A, B, C three-phase respectively；F represents voltage or electric current；α
For rotor, wherein α=ej2π/3, a vector be multiplied by rotor be regarded as its delay 120 °, a vector is multiplied by α2Represent that it prolongs
When 240 °, can specifically be realized by delay cell in PSCAD；
Step S2：Change commanders three-phase positive sequence and negative sequence voltage current transformation are become to α β axles by clark, obtained And the phase of positive and negative sequence voltage is pinned by phaselocked loop, phaselocked loop is real with PLL elements in PSCAD
It is existing；The positive-negative sequence voltage transformation for α β axles of changing commanders is become to dq rotatable coordinate axis by park again：
Thus can realize：
In formula (2),The voltage or electric current of expression α axle positive sequences,The voltage or electric current of expression β axle positive sequences,Represent α
The voltage or electric current of axle negative phase-sequence,Represent the voltage or electric current of β axle negative phase-sequences；θ is the phase angle for the positive sequence voltage that phaselocked loop obtains；For AC positive sequence voltage amplitude,For AC negative sequence voltage amplitude；
In formula (3),The d axles and q axis components of respectively positive and negative sequence voltage；
Step S3：The reference value of positive-negative sequence current dq axles is obtained according to formula (4)：
In formula (4),The reference value of positive and negative sequence electric current d axles and q axis components is represented respectively；
The active power reference value obtained for DC voltage outer shroud, it is specially：
In formula (5),For DC bus-bar voltage reference value, udcFor DC bus-bar voltage, kvpFor the ratio system of Voltage loop
Number, kviFor the integral coefficient of Voltage loop.
Step S4：4 PI parameters in current inner loop are obtained by formula (6), obtained by formula (7) 1 in outer voltage
Individual PI parameters：
In formula (6), kipFor the proportionality coefficient of electric current loop, kiiFor the integral coefficient of electric current loop；R, L is net side filter inductance
Equivalent electric resistance and inductance；KPWMFor the equivalent gain of PWM converter；TSThe sampling period of simulation model；In formula (7), C is
The electric capacity of dc bus.
The present invention gives the separation of positive-negative sequence and orientation in the double sequence independent controls of positive sequence, just by PSCAD simulation softwares
The implementation method of the important steps such as the calculating of negative sequence voltage reference value, the regulation of PI parameters, finally realizes grid-connected converter
Emulation under positive and negative double sequence independent control strategies, effectively inhibit the line of DC side busbar voltage and AC active power
Ripple, method of the invention provide theoretical foundation for the modeling and simulation of the grid-connected power generation system under power network asymmetrical；
With prominent substantive distinguishing features and significant progress；Embodiments of the invention are explained in detail above in conjunction with accompanying drawing, but
It is that the present invention is not limited to above-described embodiment, can also be not in those of ordinary skill in the art's possessed knowledge
Various changes can be made on the premise of disengaging present inventive concept.
Claims (3)
1. the PSCAD modelings of grid-connected converter and emulation mode during unbalanced grid faults, it is characterised in that：Including following step
Suddenly：
The three-phase voltage current of grid-connected converter AC is subjected to positive-negative sequence separation；
Positive sequence and negative sequence voltage electric current are transformed into α β axles by Clark, positive and negative sequence voltage is pinned by three-phase phase-locked loop
Phase, then the voltage current transformation for α β axles of changing commanders is become to dq rotatable coordinate axis by park；
According to the control targe of limitation DC side busbar voltage ripple, the requirement run with reference to current transformer unit power, try to achieve just
The reference value of negative-sequence current dq axles；
By trying to achieve the transmission function of outer voltage and current inner loop, the parameter tuning method of 5 pi regulators is provided；By unloading
The overvoltage of charged road limitation dc bus；The final positive-negative sequence independent control for realizing grid-connected converter and limitation dc bus electricity
Emboss ripple；
Specifically include following steps：
Step S1：The three-phase voltage current of grid-connected converter AC is realized to point of positive-negative sequence voltage x current by phase shift
From：
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In formula (1)：P represents positive sequence, N represents negative phase-sequence；A, b, c represent A, B, C three-phase respectively；F represents voltage or electric current；α is to turn
Son, wherein α=ej2π/3；
Step S2：Change commanders three-phase positive sequence and negative sequence voltage current transformation are become to α β axles by clark, obtained And the phase of positive and negative sequence voltage is pinned by phaselocked loop；The positive-negative sequence voltage transformation for α β axles of changing commanders is become to dq by park again
Rotatable coordinate axis：
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In formula (2),The voltage or electric current of expression α axle positive sequences,The voltage or electric current of expression β axle positive sequences,Represent that α axles are born
The voltage or electric current of sequence,Represent the voltage or electric current of β axle negative phase-sequences；θ is the phase angle for the positive sequence voltage that phaselocked loop obtains；For
AC positive sequence voltage amplitude,For AC negative sequence voltage amplitude；
In formula (3),The d axles and q axis components of respectively positive and negative sequence voltage；
Step S3：The reference value of positive-negative sequence current dq axles is obtained according to formula (4)：
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In formula (4),The reference value of positive and negative sequence electric current d axles and q axis components is represented respectively；
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The active power reference value obtained for DC voltage outer shroud, it is specially：
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In formula (5),For DC bus-bar voltage reference value, udcFor DC bus-bar voltage, kvpFor the proportionality coefficient of Voltage loop, kvi
For the integral coefficient of Voltage loop；
Step S4：4 PI parameters in current inner loop are obtained by formula (6), 1 PI in outer voltage is obtained by formula (7)
Parameter：
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In formula (6), kipFor the proportionality coefficient of electric current loop, kiiFor the integral coefficient of electric current loop；R, L is the equivalent of net side filter inductance
Resistance and inductance；KPWMFor the equivalent gain of PWM converter；TSThe sampling period of simulation model；
In formula (7), C is the electric capacity of dc bus.
2. the PSCAD modelings of grid-connected converter and emulation mode, its feature during unbalanced grid faults according to claim 1
It is：The delay of rotor is realized in step S1 by the delay cell in PSCAD.
3. the PSCAD modelings of grid-connected converter and emulation mode, its feature during unbalanced grid faults according to claim 1
It is：In step S2, phaselocked loop is realized in PSCAD with PLL elements.
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| CN102916599A (en) * | 2012-10-26 | 2013-02-06 | 河南师范大学 | Model predication control method of three-phase PWM (pulse width modulation) rectifier under unbalanced voltage |
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