CN106877704A - A kind of PWM rectifier direct Power Control method of sliding moding structure - Google Patents
A kind of PWM rectifier direct Power Control method of sliding moding structure Download PDFInfo
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- CN106877704A CN106877704A CN201510913264.0A CN201510913264A CN106877704A CN 106877704 A CN106877704 A CN 106877704A CN 201510913264 A CN201510913264 A CN 201510913264A CN 106877704 A CN106877704 A CN 106877704A
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- direct power
- power control
- pwm
- control
- control method
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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
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc 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
- H02M7/217—Conversion of ac power input into dc 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
- H02M7/219—Conversion of ac power input into dc 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 in a bridge configuration
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- Engineering & Computer Science (AREA)
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Abstract
A kind of PWM rectifier direct Power Control method of sliding moding structure discloses a kind of PWM rectifier direct Power Control method of sliding moding structure, including three-phase PWM rectification circuit, direct Power Control, three parts of Sliding mode variable structure control.The control of PWM rectifier is carried out using method proposed by the present invention, the drawbacks of rectifier harmonic wave that the direct Power Control breaker in middle frequency of traditional lookup table mode is not fixed and caused can be eliminated, the instantaneous power error caused when carrying out rotating coordinate transformation under closed-loop current control mode can also be reduced, system's transient response performance is improve.The control mode has preferable robustness and quiet, dynamic property simultaneously.
Description
Art
The present invention relates to a kind of PWM rectifier, more particularly to a kind of sliding moding structure PWM rectifier direct Power Control method.
Background technology
Three-phase voltage type PWM rectifiers have the advantages that power factor high, simple structure, controllability are good, can realize the two-way flow of energy, the field such as are widely used in wind-power electricity generation, generate electricity by way of merging two or more grid systems.With the development of Power Electronic Technique, the research of PWM rectifier control modes is also gradually goed deep into.The traditional control method of three-phase voltage type PWM rectifiers is usually that voltage or electric current are controlled, but relatively low using the power factor of electric network that obtains of inverter of this control algolithm, and mains by harmonics is serious.According to active and reactive power instantaneous method for expressing, power control strategy is applied to Three-Phase PWM Rectifier/inverter, i.e., direct Power Control (Direct Power Control,
DPC).Direct Power Control is similar to the Direct Torque Control in electric machine control system, it is that direct active power and reactive power to control system is controlled, unity power factor control can be realized in theory, with dynamic response performance is good, efficiency high, many advantages, such as simple and application field is wide is realized, by the extensive concern of domestic and foreign scholars.
In control process, the structure of variable structure control system has certain switching characteristic, this switching characteristic forces system to pass through motion by a small margin near state set in advance, and its motion is not also changed parameter perturbation with controlled device etc. by system local environment to be influenceed, so that the system under the state of a control has the advantages that rapid dynamic response speed, adaptable, robust performance are good, easy without on-line identification and physics realization.
The content of the invention
In order to the power factor of electric network for overcoming traditional control algorithm inverter to obtain is relatively low, the serious problem of mains by harmonics, the present invention proposes a kind of PWM rectifier direct Power Control method of sliding moding structure.
The technical solution adopted for the present invention to solve the technical problems is.Sliding mode variable structure control is applied in the direct Power Control of PWM rectifier, both advantages can be combined, can also be improved system transients response speed simultaneously in strengthening system robust performance.The present invention, with reference to the basic control thinking of traditional DPC, the characteristics of by Sliding mode variable structure control, is introduced into direct Power Control according to the Mathematical Modeling under PWM rectifier instantaneous power control.
The PWM rectifier direct Power Control method of sliding moding structure includes three-phase PWM rectification circuit, direct Power Control, four parts of Sliding mode variable structure control and PWM pulsewidth modulations.
Bridge rectifier, line impedance, power supply, filter capacitor and the load that the three-phase PWM rectification circuit is made up of six IGBT switching tubes are constituted, and using the break-make of PWM controlling switch pipes, realize rectification function.
After the direct Power Control to AC voltage and current by sampling, by calculating, the instantaneous active power and reactive power of system are obtained, finally give the given parameters of sliding moding structure.
The Sliding mode variable structure control（Sliding Mode Control, SMC）The core for realizing Sliding mode variable structure control is the design of switching function, and corresponding control function is obtained according to the sliding mode being pre-designed, so that control system reaches stable state.
The PWM pulsewidth modulations are used as given by the output of sliding mode controller, carry out pulsewidth modulation.
The beneficial effects of the invention are as follows：The drawbacks of rectifier harmonic wave that the direct Power Control breaker in middle frequency of traditional lookup table mode is not fixed and caused can be eliminated, the instantaneous power error caused when carrying out rotating coordinate transformation under closed-loop current control mode can also be reduced, system's transient response performance is improve.The control mode has preferable robustness and quiet, dynamic property simultaneously.
Brief description of the drawings
Fig. 1 Three-Phase PWM Rectifier main circuits.
Fig. 2 control principle block diagrams.
Specific embodiment
In Fig. 1, in Three-Phase PWM Rectifier main circuit, by line impedance with after, the bridge rectifier constituted with six IGBT is connected power supply, then parallel filtering electric capacity and load.
In Fig. 2, the DPC-SMC control systems of PWM rectifiers are to generate 4 parts by power calculation, voltage x current sampling, sliding formwork control and SVPWM to combine.Sliding mode variable structure control realizes that the core of Sliding mode variable structure control is the design of switching function, and corresponding control function is obtained according to the sliding mode being pre-designed, so that control system reaches stable state.Resulting drive signal makes the input voltage that PWM rectifiers are obtained be the sinusoidal waveform of standard of comparison after sliding mode controller and SVPWM modules, thus with preferable control effect.
In three-phase PWM rectifier, sampled by alternating voltage, the AC three-phase voltage and electric current that sampling is obtained, after carrying out 3/2 conversion, the voltage of the three-phase symmetrical power AC after being decomposed；The electric current of AC is the input voltage of three-phase PWM rectifier in three-phase symmetrical power.By DC voltage of sampling, the method controlled using PI is given according to DC voltage, and the active power that can obtain sliding mode controller gives, and reactive power is given as 0.Calculate the instantaneous active power p and reactive power q of system；The active power p* and reactive power q* for relatively giving again.After being compared with reference power, by sliding mode controller（Sliding Mode Control, SMC）Input voltage signal needed for drawing inverter and, then through SVPWM modules, obtain the switching signal of rectifier, finally control whole rectifier bridge.
Claims (5)
1. a kind of PWM rectifier direct Power Control method of sliding moding structure, it is characterised in that：Including three-phase PWM rectification circuit, direct Power Control, four parts of Sliding mode variable structure control and PWM pulsewidth modulations.
2. the PWM rectifier direct Power Control method of sliding moding structure as claimed in claim 1, it is characterised in that the bridge rectifier that the three-phase PWM rectification circuit is made up of six IGBT switching tubes, using the break-make of PWM controlling switch pipes.
3. the PWM rectifier direct Power Control method of sliding moding structure as claimed in claim 1, it is characterised in that the Direct Power is that 3/2 conversion, power calculation and PI controls have been carried out to AC voltage, electric current and DC voltage.
4. the PWM rectifier direct Power Control method of sliding moding structure as claimed in claim 1, it is characterised in that the Sliding mode variable structure control core is the design of switching function, and then system is reached stable state.
5. the PWM rectifier direct Power Control method of sliding moding structure as claimed in claim 1, it is characterised in that the voltage that the given parameters of the PWM pulsewidth modulations are obtained for Sliding mode variable structure control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510913264.0A CN106877704A (en) | 2015-12-11 | 2015-12-11 | A kind of PWM rectifier direct Power Control method of sliding moding structure |
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| CN201510913264.0A CN106877704A (en) | 2015-12-11 | 2015-12-11 | A kind of PWM rectifier direct Power Control method of sliding moding structure |
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| CN106877704A true CN106877704A (en) | 2017-06-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510913264.0A Pending CN106877704A (en) | 2015-12-11 | 2015-12-11 | A kind of PWM rectifier direct Power Control method of sliding moding structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293942A (en) * | 2020-03-07 | 2020-06-16 | 西南交通大学 | Performance improvement method for vehicle network system under multi-working-condition operation |
| CN113411002A (en) * | 2021-05-14 | 2021-09-17 | 杭州电子科技大学 | Single-phase inverter control system and method based on sliding mode variable structure of extreme learning machine |
-
2015
- 2015-12-11 CN CN201510913264.0A patent/CN106877704A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111293942A (en) * | 2020-03-07 | 2020-06-16 | 西南交通大学 | Performance improvement method for vehicle network system under multi-working-condition operation |
| CN113411002A (en) * | 2021-05-14 | 2021-09-17 | 杭州电子科技大学 | Single-phase inverter control system and method based on sliding mode variable structure of extreme learning machine |
| CN113411002B (en) * | 2021-05-14 | 2022-08-16 | 杭州电子科技大学 | Single-phase inverter control system and method based on sliding mode variable structure of extreme learning machine |
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Application publication date: 20170620 |