CN106972775B - 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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- CN106972775B CN106972775B CN201710320217.4A CN201710320217A CN106972775B CN 106972775 B CN106972775 B CN 106972775B CN 201710320217 A CN201710320217 A CN 201710320217A CN 106972775 B CN106972775 B CN 106972775B
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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
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Abstract
The invention discloses a kind of voltage source inverter control methods to zero axle vectorial structure rotating coordinate system to pass through 90 based on Second Order Generalized Integrator in dq0 synchronous rotating frames0Phase-shift system constructs a coordinate system orthogonal with zero axle, and Park is carried out to the virtual coordinate system and is transformed to synchronous rotating frame of the surfaces of revolution perpendicular to dq axial planes, of ac is just transformed to DC quantity in zero axle former in this way, 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 apparent adaptive ability, zero-sequence current control effect fabulous small-scale frequency departure.
Description
Technical field
The invention belongs to power electronics control technology fields, 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 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 related to the stabilization of system, efficient, reliable and optimization
Operation.The control targe of voltage source inverter be so that the output current floating of inverter track to constant current, and can
The variation of all kinds of loads of quick response.
It in practical 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, influences system stable operation.In order to realize the zero steady state error control of voltage source inverter,
Current most common control technology is vector control technology, using closed-loop current control, will be handed under dq synchronous rotating frames
Flow vector becomes DC quantity, can be with DAZ gene using pi regulator according to the calculated active and reactive electric current of power instruction
Active and reactive current error is adjusted in the characteristic of DC component.
Above-mentioned common voltage source inverter control method can with floating track positive sequence and negative-sequence current, but can not be with
Track zero-sequence current.With three-phase imbalance regulating device（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, especially zero-sequence current mistake under the conditions of three-phase imbalance
Conference causes device loss to increase, and seriously affects system stable operation.
According to the above analysis it is found that currently used voltage source inverter control method utilizes coordinate transform, by active, nothing
Work(Current Decoupling tracks positive sequence and negative-sequence current floating may be implemented under positive sequence, the double synchronous rotating frames of negative phase-sequence, but
Zero-sequence current can not be tracked, it is even more impossible to inhibit to zero-sequence current, has seriously affected control effect.
Invention content
For technical problem of the existing technology, propose 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 the accurate DAZ gene to zero-sequence component is realized.
Specifically, the present invention provides a kind of voltage source inverter controlling parties to zero axle vectorial structure rotating coordinate system
Method adopts the following technical scheme that：
Step（1）Acquire three phase network output current ia、ib、ic, zero-axis current i is obtained by calculation0；
Step（2）A static 0-0 ' coordinate system orthogonal with zero axle is constructed by Second Order Generalized Integrator, in 0 ' axis structure
Make one 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 dq axial planes by Park transformation
0d-0qSynchronous rotating frame, 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*;
Step（4）To current reference value i0d* with actual current vector i0dError delta i0dAnd current reference value i0q* and it is real
Border current phasor i0qError delta i0qPI controls are carried out, to the i of PI controllers output0d_outAnd i0q_outCarry out Park inverse transformations
Obtain i0_outAnd i0’_out, wherein i0_outAs realize the zero-axis current obtained after stable state DAZ gene；
The step（1）It is middle that zero-axis current I is obtained according to following formula0:
The step（2）It is middle that virtual current vector i is obtained according to following formula0'：
The step（3）It is middle according to following formula to zero-axis current vector I0Carry out Park transformation:
The step（4）It is middle according to following formula to current error signal Δ i0dWith Δ i0qCarry out PI adjustings：
Wherein, KpFor proportionality coefficient, KiFor integral coefficient, S is Laplace operator.
The 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 realized by carrying out virtual construct, rotating coordinate system transformation to the zero axle in dq0 synchronous rotating frames
DAZ gene to zero-sequence current together with positive sequence, negative-sequence current controls, and control effect is good, having filled up domestic temporary nothing has
The blank of effect control zero-axis current method.
Description of the drawings
Fig. 1 is that the present invention constructs rotating coordinate system schematic diagram 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.
Specific implementation mode
Below in conjunction with the accompanying drawings and the technical solution that further illustrates the present invention of specific implementation mode.
Present embodiment is 40kvar with a capacity, and output-current rating is the three-phase four-arm voltage source inverter of 60A
For device, DC voltage 700V.
As shown in Figure 1, 2, the embodiment of the present invention includes include the following steps：
Utilize current Hall sensor acquisition three phase network electric current ia、ib、ic, zero-axis current i is obtained according to formula0；It calculates
Formula is as follows：
A 0-0 ' coordinate system orthogonal with zero axle is constructed by Second Order Generalized Integrator module 1, one is constructed in 0 ' axis
With zero-axis current i0Orthogonal virtual current vector i0', with i0Synthesize new zero-axis current vector I0；It is as follows to construct calculation formula：
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 rotation
Turn 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 i0qBy
PI controller modules 3 export i to PI controllers0d_outAnd i0q_outIt carries out Park inverse transform blocks 4 and obtains i0_outAnd i0’_out；
Park inverse transformation expression formulas are as follows：
In the present embodiment, Kp=0.5, Ki=50 。
i0_outIt as realizes the zero-axis current obtained after stable state DAZ gene, that is, needs the object signal compensated, pass through
SVPWM technologies carry out control output compensation electric current, it can be achieved that good compensation effect to voltage source inverter.
To sum up, as shown in figure 3, the output of abc three-phase zero-sequence currents 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 apparent adaptive ability, zero-sequence current control effect for small-scale frequency departure
It is fabulous.
Those skilled in the art it should be appreciated that more than embodiment be intended merely to illustrate the mesh of the present invention
, and be not used as limitation of the invention, if in the essential scope of the present invention, to the variation of embodiment described above,
Modification will all be fallen in the scope of the claims of the present invention.
Claims (5)
1. a kind of voltage source inverter control method to zero axle vectorial structure rotating coordinate system, the zero axle vector control method
Step is：
Step (1) acquires three phase network output current ia、ib、ic, zero axle electricity in dq0 synchronous rotating frames is obtained by calculation
Flow i0；
Signal in orthogonal can be achieved in step (2) Second Order Generalized Integrator (SOGI), mainly passes through the adaptive filter of structure internal model principle
Wave device realizes that the transmission function of SOGI is：
As shown from the above formula, two output vector phases difference 90 ° of the input vector after SOGI units is wide by second order
Adopted integrator (SOGI) constructs a static 0-0 ' coordinate system orthogonal with zero axle in dq0 synchronous rotating frames, and in 0 ' axis
On obtain one and zero-axis current vector i0Orthogonal virtual current vector i0', output vector i0' by input vector i090 ° of phase shift
It obtains：
i0' and i0Synthesize new zero-axis current vector I under 0-0 ' coordinate systems0；
Static 0-0 ' the coordinate systems are reconfigured to the surfaces of revolution perpendicular to the 0 of dq axial planes by step (3) by Park transformationd-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) is to current reference value i0d* with actual current vector i0dError delta i0dAnd current reference value i0q* with practical electricity
Flow vector i0qError delta i0qPI controls are carried out, to the i of PI controllers output0d_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, special
Sign is：Zero-axis current i under dq0 synchronous rotating frames is obtained according to following formula in the step (1)0:
3. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, special
Sign is：According to following formula to zero-axis current vector I in the step (3)0Carry out Park transformation:
4. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, special
Sign is：According to following formula to current error signal Δ i in the step (4)0dWith Δ i0qCarry out PI adjustings：
i0d_out=PI (s) Δs iod
i0q_out=PI (s) Δs i0q
Wherein, KpFor proportionality coefficient, KiFor integral coefficient, S is Laplace operator.
5. the voltage source inverter control method according to claim 1 to zero axle vectorial structure rotating coordinate system, special
Sign is：I is exported to PI controllers according to following formula in the step (4)0d_outAnd i0q_outCarry out Park inverse transformations:
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| CN201811004565.1A CN108964501B (en) | 2017-05-09 | 2017-05-09 | A kind of voltage source inverter control method |
| 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 |
| 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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| 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 |
| 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 |
| CN112953318B (en) * | 2021-02-01 | 2022-08-30 | 哈尔滨工业大学 | Nonlinear compensation method for permanent magnet synchronous motor driving system inverter |
| CN117937969B (en) * | 2024-01-24 | 2024-07-09 | 广东明能科技有限公司 | Three-phase inverter hysteresis current control method, device and equipment |
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| CN108964501B (en) | 2019-06-21 |
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