CN106301053A - Three-phase four-leg inverter control method under the conditions of imbalance, nonlinear load - Google Patents
Three-phase four-leg inverter control method under the conditions of imbalance, nonlinear load Download PDFInfo
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- CN106301053A CN106301053A CN201610877729.6A CN201610877729A CN106301053A CN 106301053 A CN106301053 A CN 106301053A CN 201610877729 A CN201610877729 A CN 201610877729A CN 106301053 A CN106301053 A CN 106301053A
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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
-
- 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
- H02M7/539—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 with automatic control of output wave form or frequency
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The present invention provides the three-phase four-leg inverter control method under the conditions of a kind of imbalance, nonlinear load, including step one, real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, frequency, after resolution process, realize the uneoupled control to it by abc/dq0 coordinate transform；Step 2, combine Repetitive Control Technique and PI control technology carries out closed loop control to d, q, 0 axle respectively, reach to control target；Step 3, after dq0/abc coordinate transform, use three-dimensional space vector modulation technology based on abc coordinate system, it is achieved the triggering to four brachium pontis of three-phase four-leg inverter controls.The present invention solves in power distribution network that the inverter three-phase output voltage that uneven, nonlinear load causes is asymmetric, wave distortion problem, under the conditions of realization imbalance, nonlinear load, the three-phase output voltage symmetry output of three-phase four-leg inverter, effectively suppresses wherein DC component, harmonic component simultaneously.
Description
Technical field
The present invention relates to power transmission and distribution technical field, three-phase four bridge under the conditions of a kind of imbalance, nonlinear load
Arm inverter control method.
Background technology
In recent years, China greatly develops the distributed power generation including new forms of energy, to tackle the need of global economic development
The quagmire that the summation energy is day by day deficient.At present, in power system, inverter has become power-supply system requisite composition portion
Point, it, as the core composition during the conversion of distributed generation system energy and control, affects and decides whole system
Stable, safe and reliable, efficiency, even with life-span and cost, becomes the key in distributed power generation development and application already.
But meanwhile, uneven in power distribution network, nonlinear load exists in a large number in user side, grid side and day by day increases
Many.Unbalanced load can cause the three-phase output voltage of inverter asymmetric, is to cause three-phase output in power system asymmetric
Main cause, nonlinear load then can cause inverter output waveforms to be distorted, produce substantial amounts of DC component, harmonic wave
Component, deteriorates the quality of power supply.Owing to conventional three-phase three-leg inverter is limited to self topological structure, it is impossible to control its filtered electrical
Hold the electric potential relation between midpoint and DC bus-bar voltage midpoint, do not possess band unbalanced load ability, therefore, in recent years to injustice
Under the conditions of weighing apparatus, nonlinear load, the control technical research of three-phase inverter receives extensive concern.
Summary of the invention
It is an object of the invention to propose the three-phase four-leg inverter under the conditions of a kind of imbalance, nonlinear load control
Method, the inverter three-phase output voltage that uneven in solution power distribution network, nonlinear load causes is asymmetric, wave distortion is asked
Topic, it is achieved the three-phase output voltage symmetry output of three-phase four-leg inverter under the conditions of imbalance, nonlinear load, simultaneously to it
Middle DC component, harmonic component effectively suppress.
It is an object of the invention to what techniques below scheme realized:
Three-phase four-leg inverter control method under the conditions of a kind of imbalance, nonlinear load, comprises the steps:
Step one, real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, frequency, after resolution process
The uneoupled control to it is realized by abc/dq0 coordinate transform；
Step 2, combine Repetitive Control Technique and PI control technology carries out closed loop control to d, q, 0 axle respectively, reach to control
Target；
Step 3, after dq0/abc coordinate transform, use three-dimensional space vector modulation technology based on abc coordinate system, real
The now triggering to four brachium pontis of three-phase four-leg inverter controls.
Further, described step one to implement process as follows:
A) real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, and by three-phase output voltageIt is decomposed into positive sequence, negative phase-sequence, zero sequence voltage component:
In formula (1)～(3), footnote (1), (2), (0) represent positive sequence, negative phase-sequence, zero-sequence component respectively；
B) by decomposing positive sequence that three-phase four-leg inverter three-phase output voltage obtains, negative phase-sequence, zero-sequence component are carried out respectively
Park converts, it is achieved uneoupled control:
Further, described step 2 combines Repetitive Control Technique and PI control technology carries out closed loop to d, q, 0 axle respectively
Controlling, making d shaft voltage component control target is 220 √ 2V, and it is 0V that q axle and 0 shaft voltage component control target,
Wherein Repetitive controller aspect, compared calculating by the sampled value in a upper power frequency period moment with controlling target
Obtain output bias, and moment more calculated deviation corresponding with this power frequency period adds up, as controlled device
Feedback quantity, and continue to be applied to next cycle by accumulated value, move in circles；
PI control aspect, the sampled value obtained sampling in units of carrier cycle with control target compare be calculated defeated
Deviate, and directly as the feedback quantity of controlled device.
The present invention, by using three-phase four-leg inverter, utilizes it to be capable of the spy that three-phase voltage output is separate
Point, it is proposed that the three-phase four-leg inverter control method under the conditions of a kind of imbalance, nonlinear load, solves in power distribution network
Three-phase voltage asymmetry that uneven, nonlinear load causes, wave distortion problem, meet at present to three-phase inverter simultaneously
The demand that band is uneven, non-linear load capacity increases day by day.
Accompanying drawing explanation
Fig. 1 is three-phase four-leg inverter topological structure schematic diagram；
Fig. 2 is that the control of the three-phase four-leg inverter control method under the conditions of present invention imbalance, nonlinear load is former
Reason block diagram；
Fig. 3 is the ultimate principle block diagram of Repetitive controller in the present invention；
Fig. 4 is that the three-phase four-leg inverter three-phase output voltage under the conditions of uneven in the present invention, nonlinear load is imitated
True oscillogram.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the present invention, the technical scheme in the present invention is clearly and completely described.
Refer to Fig. 1 and Fig. 2, the present invention provides the three-phase four-arm inversion under the conditions of a kind of imbalance, nonlinear load
Device control method, comprises the steps:
Step one, real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, frequency, after resolution process
The uneoupled control to it is realized by abc/dq0 coordinate transform.
Described step one to implement process as follows:
A) real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, and by three-phase output voltageIt is decomposed into positive sequence, negative phase-sequence, zero sequence voltage component:
In formula (1)～(3), footnote (1), (2), (0) represent positive sequence, negative phase-sequence, zero-sequence component respectively.
B) by decomposing positive sequence that three-phase four-leg inverter three-phase output voltage obtains, negative phase-sequence, zero-sequence component are carried out respectively
Park converts, it is achieved uneoupled control:
Analysis mode (4)～(6) understand:
1) when threephase load balances, three-phase four-leg inverter output voltage is without negative phase-sequence, zero-sequence component, at dq0 coordinate
The space vector of the lower synthesis of system is static relative to dq0 coordinate system, and the component on d axle and q axle is certain certain value, divides on 0 axle
Amount is 0；
2) when threephase load imbalance, positive-sequence component and 1 in three-phase four-leg inverter output voltage) situation is consistent；
Space vector direction of rotation in dq plane and the dq0 coordinate system of negative sequence component synthesis are contrary, and on dq coordinate axes, projection is
2 frequencys multiplication of sinusoidal quantity, are projected as 0 on 0 axle；Zero-sequence component is characterized by 0 axle under dq0 coordinate system, is the sine on 0 axle
Amount.
3) real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, and it is carried out discrete fourier
Conversion:
In formula (7), n represents sinusoidal quantity frequency multiplication number of times, an、bn(n ≠ 0,1) is respectively each harmonic sine term and cosine term
Amplitude.
Analysis mode (7) understands:
When threephase load is non-linear, three-phase four-leg inverter output voltage can be analyzed to fundametal compoment and divides with direct current
Amount, higher harmonic components.
In dq0 coordinate system, when the space vector of fundametal compoment synthesis balances with threephase load, situation is similar；Direct current divides
Amount, harmonic component are projected as the n-1 frequency multiplication of sinusoidal quantity on dq coordinate axes, are projected as 0 on 0 axle.
In sum, only need respectively d, q, 0 axle to be carried out closed loop control, reach to control target, can realize three-phase four
The uneoupled control of leg inverter three-phase output voltage.
Step 2, combine Repetitive Control Technique and PI control technology carries out closed loop control to d, q, 0 axle respectively, reach to control
Target.
Concrete, control technology in conjunction with Repetitive Control Technique and PI and respectively d, q, 0 axle are carried out closed loop control, make d axle electricity
It is 220 √ 2V that pressure component controls target, and it is 0V that q axle and 0 shaft voltage component control target.
Repetitive controller aspect, compared the sampled value in a upper power frequency period moment with control target and is calculated
Output bias, and moment more calculated deviation corresponding with this power frequency period add up, as the feedback of controlled device
Amount, and continue to be applied to next cycle by accumulated value, move in circles, as shown in Figure 3.
PI control aspect, the sampled value obtained sampling in units of carrier cycle with control target compare be calculated defeated
Deviate, and directly as the feedback quantity of controlled device.
Step 3, after dq0/abc coordinate transform, use three-dimensional space vector modulation technology (3D based on abc coordinate system
SVM), it is achieved the triggering to four brachium pontis of three-phase four-leg inverter controls.
Simulation analysis
For feasibility and the effectiveness of the checking present invention, carry out simulation analysis based on MATLAB/Simulink.
Emulation explanation: the uneven nonlinear load of simulation, carries out open loop, closed loop control in fact to three-phase four-leg inverter
Test.
Simulation parameter: taking a phase load is 1k Ω, b phase load be forward half carrier load of 2k Ω, c phase load be 2k Ω's
Reverse half carrier load.
Simulation analysis: simulation result is as shown in Figure 4, it is known that before and after open loop, closed loop control, three-phase four-leg inverter three-phase
Output voltage waveforms is leveled off to rapidly sine wave by disorder, shows that the present invention can effectively control imbalance, nonlinear load bar
Three-phase four-leg inverter three-phase output voltage under part.
The above, the only detailed description of the invention of the present invention, but protection scope of the present invention is not limited thereto, and any
Belong to those skilled in the art in the technical scope that the invention discloses, the change that can readily occur in or replacement, all answer
Contain within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with scope of the claims.
Claims (3)
1. the three-phase four-leg inverter control method under the conditions of an imbalance, nonlinear load, it is characterised in that include as
Lower step:
Step one, real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, frequency, pass through after resolution process
Abc/dq0 coordinate transform realizes the uneoupled control to it；
Step 2, combine Repetitive Control Technique and PI control technology carries out closed loop control to d, q, 0 axle respectively, reach to control mesh
Mark；
Step 3, after dq0/abc coordinate transform, use three-dimensional space vector modulation technology based on abc coordinate system, it is achieved right
The triggering of four brachium pontis of three-phase four-leg inverter controls.
2. the three-phase four-leg inverter control method under the conditions of imbalance as claimed in claim 1, nonlinear load, it is special
Levy be described step one to implement process as follows:
A) real-time sampling three-phase four-leg inverter three-phase output voltage amplitude, phase place, and by three-phase output voltageIt is decomposed into positive sequence, negative phase-sequence, zero sequence voltage component:
In formula (1)～(3), footnote (1), (2), (0) represent positive sequence, negative phase-sequence, zero-sequence component respectively；
B) by decomposing positive sequence that three-phase four-leg inverter three-phase output voltage obtains, negative phase-sequence, zero-sequence component carry out Park respectively
Conversion, it is achieved uneoupled control:
3. the three-phase four-leg inverter control method under the conditions of imbalance as claimed in claim 1, nonlinear load, it is special
Levy and be: described step 2 combines Repetitive Control Technique and PI control technology carries out closed loop control to d, q, 0 axle respectively, makes d axle
It is 220 √ 2V that component of voltage controls target, and it is 0V that q axle and 0 shaft voltage component control target；
Wherein Repetitive controller aspect, compared the sampled value in a upper power frequency period moment with control target and is calculated
Output bias, and moment more calculated deviation corresponding with this power frequency period add up, as the feedback of controlled device
Amount, and continue to be applied to next cycle by accumulated value, move in circles；
PI control aspect, the sampled value obtained sampling in units of carrier cycle with control target and compare and be calculated output partially
Difference, and directly as the feedback quantity of controlled device.
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| CN201610877729.6A CN106301053A (en) | 2016-10-08 | 2016-10-08 | Three-phase four-leg inverter control method under the conditions of imbalance, nonlinear load |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107093954A (en) * | 2017-05-26 | 2017-08-25 | 电子科技大学 | The two-stage type three-phase four-arm inversion system and control strategy boosted with BOOST |
| CN108880208A (en) * | 2018-08-03 | 2018-11-23 | 华侨大学 | A kind of estimation of bridge-type inverter output voltage DC component and suppressing method |
| CN109713928A (en) * | 2018-12-30 | 2019-05-03 | 东北电力大学 | Four bridge legs dual output inverter SVPWM method under unbalanced load |
| CN110739877A (en) * | 2019-11-07 | 2020-01-31 | 福建工程学院 | Control method of four-leg inverter system of marine generator |
| WO2020041017A1 (en) * | 2018-08-22 | 2020-02-27 | Caterpillar Inc. | Inverter topology |
| CN112583293A (en) * | 2020-12-15 | 2021-03-30 | 武汉力行远方电源科技有限公司 | Control method and system suitable for three-phase four-wire system inverter power supply |
| CN114826009A (en) * | 2022-05-26 | 2022-07-29 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-bridge-arm auxiliary converter |
| CN117424478A (en) * | 2023-10-09 | 2024-01-19 | 江苏科曜能源科技有限公司 | Three-phase four-bridge arm inverter control system and control method of composite repetitive controller |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107093954A (en) * | 2017-05-26 | 2017-08-25 | 电子科技大学 | The two-stage type three-phase four-arm inversion system and control strategy boosted with BOOST |
| CN107093954B (en) * | 2017-05-26 | 2020-11-06 | 电子科技大学 | Two-stage three-phase four-leg inverter system with BOOST boosting function and control strategy |
| CN108880208A (en) * | 2018-08-03 | 2018-11-23 | 华侨大学 | A kind of estimation of bridge-type inverter output voltage DC component and suppressing method |
| CN108880208B (en) * | 2018-08-03 | 2020-04-07 | 华侨大学 | Method for estimating and suppressing direct-current component of output voltage of bridge inverter |
| WO2020041017A1 (en) * | 2018-08-22 | 2020-02-27 | Caterpillar Inc. | Inverter topology |
| US10715052B2 (en) | 2018-08-22 | 2020-07-14 | Caterpillar Inc. | Inverter topology |
| CN109713928A (en) * | 2018-12-30 | 2019-05-03 | 东北电力大学 | Four bridge legs dual output inverter SVPWM method under unbalanced load |
| CN110739877A (en) * | 2019-11-07 | 2020-01-31 | 福建工程学院 | Control method of four-leg inverter system of marine generator |
| CN112583293A (en) * | 2020-12-15 | 2021-03-30 | 武汉力行远方电源科技有限公司 | Control method and system suitable for three-phase four-wire system inverter power supply |
| CN114826009A (en) * | 2022-05-26 | 2022-07-29 | 中车青岛四方车辆研究所有限公司 | Control method and device of three-phase four-bridge-arm auxiliary converter |
| WO2023066407A1 (en) * | 2022-05-26 | 2023-04-27 | 中车青岛四方车辆研究所有限公司 | Method and apparatus for controlling three-phase four-bridge-arm auxiliary converter |
| CN117424478A (en) * | 2023-10-09 | 2024-01-19 | 江苏科曜能源科技有限公司 | Three-phase four-bridge arm inverter control system and control method of composite repetitive controller |
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