CN106972775A - A kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system - Google Patents
A kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system Download PDFInfo
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- CN106972775A CN106972775A CN201710320217.4A CN201710320217A CN106972775A CN 106972775 A CN106972775 A CN 106972775A CN 201710320217 A CN201710320217 A CN 201710320217A CN 106972775 A CN106972775 A CN 106972775A
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- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 230000009466 transformation Effects 0.000 claims description 5
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- 238000000844 transformation Methods 0.000 claims description 4
- 230000005611 electricity Effects 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 claims description 2
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- 230000003044 adaptive effect Effects 0.000 abstract description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
Abstract
The invention discloses a kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system, in dq0 synchronous rotating frames, pass through 90 based on Second Order Generalized Integrator0Phase-shift system constructs a coordinate system orthogonal with zero axle, and synchronous rotating frame of the surfaces of revolution perpendicular to dq axial planes is transformed to virtual coordinate system progress Park, of ac is just transformed to DC quantity in so former zero axle, and DAZ gene control can be realized by PI controllers；Control program of the present invention can accurately and quickly track the zero-sequence component in dq0 coordinate system zero axles, while the program has obvious adaptive ability for the frequency departure of small range, zero-sequence current control effect is fabulous.
Description
Technical field
The invention belongs to power electronics control technology field, and in particular to a kind of to zero axle vectorial structure rotating coordinate system
Voltage source inverter control method.
Background technology
Voltage source inverter has been obtained widely in fields such as regenerative resource is grid-connected, power quality controlling, frequency controls
Research and application.In these areas, the control method of inverter is directly connected to the stabilization of system, efficient, reliable and optimization
Operation.The control targe of voltage source inverter tracks given electric current with being so that the output current floating of inverter, and can
The change of all kinds of loads of quick response.
In actual applications, can be in voltage source inverter due to factors such as unbalanced load, nonlinear load, switching deads
Low-order harmonic is introduced in the output current of device, system stable operation is influenceed.In order to realize the zero steady state error control of voltage source inverter,
Control technology the most frequently used at present is vector control technology, using closed-loop current control, will be handed under dq synchronous rotating frames
Flow vector is changed into DC quantity, the active and reactive electric current calculated according to power instruction, can be with DAZ gene using pi regulator
The characteristic of DC component, active and reactive current error is adjusted.
Above-mentioned conventional voltage source inverter control method can track positive sequence and negative-sequence current with floating, but can not be with
Track zero-sequence current.With three-phase imbalance adjusting means（SPC）More and more apply in power quality controlling field, three-phase four
The control of bridge arm current transformer neutral conductor zero-sequence current becomes particularly important, the zero-sequence current mistake especially under the conditions of three-phase imbalance
Conference causes device loss increase, has a strong impact on system stable operation.
Analysis is understood more than, and conventional voltage source inverter control method utilizes coordinate transform at present, by active, nothing
Work(Current Decoupling, positive sequence and negative-sequence current are tracked with can realizing floating under positive sequence, the double synchronous rotating frames of negative phase-sequence, but
Zero-sequence current can not be tracked, zero-sequence current can not more be suppressed, have a strong impact on control effect.
The content of the invention
The technical problem existed for prior art, proposes that a kind of voltage source to zero axle vectorial structure rotating coordinate system is inverse
Become device control method, the zero axle of dq0 synchronous rotating frames is reconstructed into rotating coordinate system, zero axle of ac is transformed to direct current
Amount is controlled, and realizes the accurate DAZ gene to zero-sequence component.
Specifically, the invention provides a kind of voltage source inverter controlling party to zero axle vectorial structure rotating coordinate system
Method, is adopted the following technical scheme that：
Step（1）Gather three phase network output current ia、ib、ic, zero-axis current i is obtained by calculating0；
Step（2）One static 0-0 ' coordinate system orthogonal with zero axle is constructed by Second Order Generalized Integrator, one is constructed in 0 ' axle
Individual and zero-axis current i0Orthogonal virtual current vector i0', with i0Synthesize new zero-axis current vector I0；
Step（3）Static 0-0 ' the coordinate systems are reconfigured to the surfaces of revolution perpendicular to the 0 of dq axial planes by Park conversiond-0q
Synchronous rotating frame, new 0d-0qBy zero-axis current vector I under rotating coordinate system0It is decomposed into i0dAnd i0q;Similarly obtain electric current
Reference value i0dAnd i *0q*;
Step（4）To current reference value i0d* with actual current vector i0dError delta i0dAnd current reference value i0q* with actual electricity
Flow vector i0qError delta i0qPI controls are carried out, the i exported to PI controllers0d_outAnd i0q_outPark inverse transformations are carried out to obtain
i0_outAnd i0’_out, wherein i0_outAs realize the zero-axis current obtained after stable state DAZ gene；
Described step（1）It is middle that zero-axis current I is obtained according to following formula0:
Described step（2）It is middle that virtual current vector i is obtained according to following formula0’：
Described step（3）It is middle according to following formula to zero-axis current vector I0Carry out Park conversion:
Described step（4）It is middle according to following formula to current error signal Δ i0dWith Δ i0qCarry out PI regulations：
Wherein, KpFor proportionality coefficient, KiFor integral coefficient, S is Laplace operator.
Described step（3）It is middle that i is exported to PI controllers according to following formula0d_outAnd i0q_outCarry out Park inverse transformations:
The present invention is converted by carrying out virtual construct, rotating coordinate system to the zero axle in dq0 synchronous rotating frames, is realized pair
Zero-sequence current is controlled together with the DAZ gene of positive sequence, negative-sequence current, and control effect is good, has filled up domestic temporary nothing and has effectively controlled
The blank of zero-axis current method processed.
Brief description of the drawings
Fig. 1 constructs rotating coordinate system schematic diagram for the present invention to zero axle.
Fig. 2 is zero-axis current control system figure of the present invention.
Fig. 3 is control method of the present invention in normal mains frequency（50HZ）The three-phase zero axle electricity of lower voltage source inverter operation
Stream tracking simulation waveform.
Embodiment
Below in conjunction with the accompanying drawings and embodiment further illustrates technical scheme.
Present embodiment is using a capacity as 40kvar, and output-current rating is 60A three-phase four-arm voltage source inverter
Exemplified by device, DC voltage is 700V.
As shown in Figure 1, 2, the embodiment of the present invention includes, and comprises the following steps：
Utilize current Hall sensor collection three phase network electric current ia、ib、ic, zero-axis current i is obtained according to formula0；Calculation formula
It is as follows：
One 0-0 ' coordinate system orthogonal with zero axle is constructed by Second Order Generalized Integrator module 1, one and zero is constructed in 0 ' axle
Shaft current i0Orthogonal virtual current vector i0', with i0Synthesize new zero-axis current vector I0；Construct calculation formula as follows：
0-0 ' coordinate systems are reconfigured to the surfaces of revolution perpendicular to the 0 of dq axial planes by Park conversion modules 2d-0qSynchronous rotary
Coordinate system, new 0d-0qBy zero-axis current vector I under rotating coordinate system0It is decomposed into i0dAnd i0q;Similarly obtain current reference value
i0dAnd i *0q* ;Park transforms are as follows：
Current reference value i0dAnd i *0q* actual current vector i is subtracted0dAnd i0qObtain error signal Δ i0dWith Δ i0qControlled by PI
Device module 3 processed, i is exported to PI controllers0d_outAnd i0q_outCarry out Park inverse transform blocks 4 and obtain i0_outAnd i0’_out；Park
Inverse transformation expression formula is as follows：
In the present embodiment, Kp=0.5, Ki=50 。
i0_outThe zero-axis current obtained after stable state DAZ gene is as realized, that is, needs the object signal of compensation, passes through
SVPWM technologies are controlled output compensation electric current to voltage source inverter, and good compensation effect can be achieved.
To sum up, as shown in figure 3, the output of abc three-phases zero-sequence current has tracked given value of current well, show that the present invention is carried
The voltage source inverter control program to zero axle vectorial structure rotating coordinate system gone out can accurately track dq0 coordinate system zero axles
Zero-sequence component, while the program has obvious adaptive ability, zero-sequence current control effect for the frequency departure of small range
It is fabulous.
Those skilled in the art is it should be appreciated that the embodiment of the above is intended merely to the mesh of the explanation present invention
, and limitation of the invention is not used as, as long as in the essential scope of the present invention, change to embodiment described above,
Modification will all fall in the range of the claim of the present invention.
Claims (6)
1. the step of a kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system, current control method
For：
Step（1）Gather three phase network output current ia、ib、ic, zero-axis current i is obtained by calculating0；
Step（2）One static 0-0 ' coordinate system orthogonal with zero axle is constructed by Second Order Generalized Integrator, one is constructed in 0 ' axle
Individual and zero-axis current i0Orthogonal virtual current vector i0', with i0Synthesize new zero-axis current vector I0；
Step（3）Static 0-0 ' the coordinate systems are reconfigured to the surfaces of revolution perpendicular to the 0 of dq axial planes by Park conversiond-0qTogether
Rotating coordinate system is walked, 0d-0qBy zero-axis current vector I under rotating coordinate system0It is decomposed into i0dAnd i0q;Similarly obtain current reference
Value i0dAnd i *0q*;
Step（4）To current reference value i0d* with actual current vector i0dError delta i0dAnd current reference value i0q* with actual electricity
Flow vector i0qError delta i0qPI controls are carried out, the i exported to PI controllers0d_outAnd i0q_outPark inverse transformations are carried out to obtain
i0_outAnd i0’_out, wherein i0_outAs realize the zero-axis current obtained after stable state DAZ gene.
2. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, it is special
Levy and be：Described step（1）It is middle that zero-axis current i is obtained according to following formula0:
。
3. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, it is special
Levy and be：Described step（2）It is middle that virtual current vector i is obtained according to following formula0’:
。
4. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, it is special
Levy and be：Described step（3）It is middle according to following formula to zero-axis current vector I0Carry out Park conversion:
。
5. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, it is special
Levy and be：Described step（4）It is middle according to following formula to current error signal Δ i0dWith Δ i0qCarry out PI regulations：
Wherein, KpFor proportionality coefficient, KiFor integral coefficient, S is Laplace operator.
6. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, it is special
Levy and be：Described step（4）It is middle that i is exported to PI controllers according to following formula0d_outAnd i0q_outCarry out Park inverse transformations:
。
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| CN201710320217.4A CN106972775B (en) | 2017-05-09 | 2017-05-09 | A kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system |
| CN201811004565.1A CN108964501B (en) | 2017-05-09 | 2017-05-09 | A kind of voltage source inverter control method |
| CN201811004563.2A CN108964500B (en) | 2017-05-09 | 2017-05-09 | It is a kind of can be to the method that zero-sequence current control effectively |
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| CN201710320217.4A CN106972775B (en) | 2017-05-09 | 2017-05-09 | A kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system |
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| CN201811004563.2A Division CN108964500B (en) | 2017-05-09 | 2017-05-09 | It is a kind of can be to the method that zero-sequence current control effectively |
| CN201811004565.1A Division CN108964501B (en) | 2017-05-09 | 2017-05-09 | A kind of voltage source inverter control method |
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| CN201811004565.1A Active CN108964501B (en) | 2017-05-09 | 2017-05-09 | A kind of voltage source inverter control method |
| CN201710320217.4A Active CN106972775B (en) | 2017-05-09 | 2017-05-09 | A kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112383073A (en) * | 2020-11-26 | 2021-02-19 | 国网北京市电力公司 | Analysis method and analysis device for zero sequence current value in power distribution network and power grid monitoring terminal |
| CN112953318A (en) * | 2021-02-01 | 2021-06-11 | 哈尔滨工业大学 | Nonlinear compensation method for permanent magnet synchronous motor driving system inverter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109742795B (en) * | 2019-01-10 | 2022-05-20 | 西北工业大学 | SOGI-based single-phase networking control method under virtual coordinate system |
| CN111404190B (en) * | 2020-04-19 | 2021-09-03 | 中国电建集团华东勘测设计研究院有限公司 | Control method and system for enhancing power output capability of MMC converter station under power grid fault |
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| CN112953318A (en) * | 2021-02-01 | 2021-06-11 | 哈尔滨工业大学 | Nonlinear compensation method for permanent magnet synchronous motor driving system inverter |
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| CN106972775B (en) | 2018-10-26 |
| CN108964500B (en) | 2019-06-21 |
| CN108964501B (en) | 2019-06-21 |
| CN108964500A (en) | 2018-12-07 |
| CN108964501A (en) | 2018-12-07 |
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