CN101638061A - Method for suppressing line-side harmonics of magnetic-levitation train tractive power supply system capable of feeding back braking energy - Google Patents
Method for suppressing line-side harmonics of magnetic-levitation train tractive power supply system capable of feeding back braking energy Download PDFInfo
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- CN101638061A CN101638061A CN200910194594A CN200910194594A CN101638061A CN 101638061 A CN101638061 A CN 101638061A CN 200910194594 A CN200910194594 A CN 200910194594A CN 200910194594 A CN200910194594 A CN 200910194594A CN 101638061 A CN101638061 A CN 101638061A
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Abstract
The invention belongs to power supply, in particular to a method for suppressing line-side harmonics of a magnetic-levitation train tractive power supply system capable of feeding back braking energy.The method comprises the following steps: a controller transforms an input current and an input voltage of an alternating current-direct current (AC-DC) transformation device into a current and a voltage in a rotating coordinate system by dq coordinate transformation; after the current and the voltage pass by a low-pass filter, the current is projected in a voltage direction, the projection is compared with an adjusted difference value between a positive DC bus and a negative DC bus by a proportional integral controller to obtain projections of a current active component on a q-axis and a d-axis; the projections on the q-axis and the d-axis are inversely transformed from a phase-locked ring at an angular frequency extracted from the input voltage to obtain a fundamental wave current active component; the difference of the fundamental wave current active component and the input current is a compensating current component which is compared with a practically measured AC of a three-phasefour-quadrant converter to obtain an error signal; and the turn-on time and the duty ratio of each power switching tube of the three-phase four-quadrant converter are calculated by using the error signal and a deadbeat predictor current control method, thereby sending out a PWM control signal of each power switching tube.
Description
Technical field:
The invention belongs to the method that suppresses current harmonics, relate in particular to the humorous wave method of inhibition that a kind of alternating continuous-current commutating machine of not controlling rectification and Thyristor Controlled rectification with diode provides the magnetic-suspension tractive electric power system of traction electric power.
Background technology:
What the tractive power supply system of existing high-speed maglev train used does not control alternating continuous-current commutating machine and the series connected inverter that rectification and Thyristor Controlled rectification are formed by diode, the function of the braking energy feedback electrical network of this alternating continuous-current commutating machine during not with train braking, and can make the distortion of electrical network current on line side waveform generation, make it to contain abundant low-order harmonic electric current.This phenomenon that is called harmonic pollution will make the power factor of electric power system reduce, and a large amount of reactive component of currents increases the grid power transmission loss, influences the quality of power supply of whole electrical network.
The patent No. 200410024636.6, the Chinese invention patent that name is called " rectification, filtering, reactive power compensator " has proposed to use four quadrant convertor to replace the part of existing alternating continuous-current commutating machine as the high-speed magnetic floating electric power system, not only when train is in traction state, supply with train load behind the power converter with electrical network, be in glancing impact at train and can give electrical network with braking energy feedback again.Simultaneously, because the frequency height of four quadrant convertor switch can reduce the generation of low-order harmonic effectively, reduced the aberration rate of current on line side, improved the quality of power supply of electrical network, power factor can be 1 when train traction, and power factor can be negative 1 when feedback braking.
But to make the tractive power supply system of high-speed magnetic floating too expensive on cost owing to use four quadrant convertor with capacitance grade to substitute existing alternating continuous-current commutating machine, is greatly limited on financial resources and is difficult to realization.
The present inventor is after analysing in depth the magnetic floating traffic of the main line of growing up, think owing on the main line of growing up, supply more than one of the traction train that electric power travels by same substation, the braking energy of train will be absorbed by other train that travels that is in traction state, the energy that in fact can feed back to electrical network is less than now exchanging the capacity of rheology changing device always, therefore can utilize original alternating continuous-current commutating machine that traction power is provided, utilize the four quadrant convertor feeding braking energy back of low capacity in parallel, when drawing, turn-off the work of four quadrant convertor by controller, when feedback, start four limits and resemble current transformer work (separate case application is not so be described further).But this technical scheme because of whens traction four limit resemble current transformer and quit work, can not bring into play the function that it suppresses harmonic wave.
Summary of the invention:
But the magnetic-levitation train tractive power supply system that the object of the present invention is to provide a kind of feeding braking energy back suppresses the method for side harmonics, but solution is in the magnetic-suspension tractive electric power system of the feeding braking energy back that the four quadrant convertor of the low capacity of alternating continuous-current commutating machine and parallel connection is formed, when controller provides haulage capacity at alternating continuous-current commutating machine, control opening or turn-offing of four quadrant convertor power switch pipe, compensating reactive power and harmonic current work the technical matters that suppresses the electrical network side harmonics.
The technical method that the present invention addresses the above problem is:
But a kind of magnetic-levitation train tractive power supply system of feeding braking energy back suppresses the method for side harmonics, it is characterized in that: controller obtains the received current and the input voltage of alternating continuous-current commutating machine respectively by current sensor and voltage sensor, the alternating current of three-phase four-quadrant current transformer and DC bus-bar voltage, the micro controller system of controller or data signal processor become electric current and voltage under the rotational coordinates with above-mentioned received current and input voltage through the dq coordinate transform, electric current under this rotational coordinates and voltage are through doing projection on the voltage direction respectively with electric current behind the low-pass filter, and the difference of above-mentioned projection and the positive and negative DC bus-bar voltage result after pi controller is regulated relatively obtained the projection of the active component of current on q axle and d axle, again with the projection of this active component of current on q axle and d axle can obtain the fundamental current active component by the angular frequency inverse transform that input voltage extracts from phaselocked loop, the difference of this fundamental current active component and received current is given compensating current component, the alternating current of the three-phase four-quadrant current transformer of this compensating current component and current sensor actual detected is relatively obtained error signal, use dead-beat predicted current control method with each power switch pipe of this error signal calculation three-phase four-quadrant current transformer this moment service time at last, and the dutycycle of service time and turn-off time, thereby determine and send the pwm control signal of each power switch pipe of three-phase four-quadrant current transformer.
The invention has the beneficial effects as follows:
1. the present invention can suppress the harmonic wave of tractive power supply system, reduces its total percent harmonic distortion (THD) and makes power factor near 1, has improved the quality of power supply of electrical network, and has improved capacity usage ratio significantly.
2. solve digital control hysteresis in the current predicted current control method with the dead beat predicted current control method that is applied to four quadrant convertor, factors such as alternating current sampling channel delay improve the robustness of controller to inductance parameters to four-quadrant current limiter electric current loop Effect on Performance.
Description of drawings:
Fig. 1 is to use magnetic-levitation train tractive power supply system of the present invention.
Fig. 2 is the control block diagram of four quadrant convertor active power filtering of the present invention.
The specific embodiment:
See also Fig. 1, use magnetic-levitation train tractive power supply system of the present invention and except that inverter 3, also comprise the not alternating continuous-current commutating machine 2 that is composed in series of control rectifier and Thyristor Controlled rectifier of diode, the three-phase four-quadrant current transformer 4 of low capacity and control setup 5, this control setup 5 is mainly by current sensor, voltage sensor, micro controller system or digital signal processor (DSP) are formed, the interchange end of this three-phase four-quadrant current transformer 4 is connected with the interchange end and the electrical network 1 of this alternating continuous-current commutating machine 2 respectively by voltage transformer, and the dc bus of the dc terminal of this three-phase four-quadrant current transformer 4 and this alternating continuous-current commutating machine 2 dc terminal connects and composes common dc bus to the magnetic-levitation train power supply as load 3.The current sensor of control setup 5 obtains the received current i that alternating continuous-current commutating machine 2 exchanges end respectively with voltage sensor
1With input voltage u
s, three-phase four-quadrant current transformer 4 alternating current i
cAnd positive and negative DC bus-bar voltage V
Dc, V
* Dc
See also Fig. 2, the micro controller system of control setup 5 or DSP are with received current i
1With input voltage u
sCoordinate transform obtains the current i under the rotating coordinate system through dq
1q, i
1dWith voltage u
Sq, u
Sd, the current i under this rotating coordinate system
1q, i
1dWith voltage u
Sq, u
SdAfter low-pass filter LPF filtering with current i
1q, i
1dBe voltage u respectively
Sq, u
SdProjection on the direction, and with above-mentioned projection i
Pq, i
PdWith positive and negative DC bus-bar voltage V
Dc, V
* DcThe result of difference after pi controller PI regulates relatively obtain the projection i of the active component of current at q axle and d axle
1pd, i
1pq, again with this projection i
1pd, i
1pqWith from phase-locked loop pll by input voltage u
sThe angular frequency inverse transform of extracting obtains fundamental current active component i
f, this fundamental current active component i
fWith received current i
1Difference be given compensating current component i
* c, with compensating current component i
* cAlternating current i with the three-phase four-quadrant current transformer 4 of actual detected
cRelatively obtain error signal, the pre-current control method of dead beat that will be used for the three-phase four-quadrant current transformer at last is with this error signal calculation three-phase four-quadrant current transformer this moment 4 each power switch pipe service time T
s, and open dutycycle L with the turn-off time, with and determine and send the pwm control signal of each power switch pipe of three-phase four-quadrant current transformer.So just can make the three-phase four-quadrant current transformer alternating continuous-current commutating machine during to train load output traction electric energy with the three-phase four-quadrant current transformer as active filter, suppress electrical network 1 current on line side effectively and produce distorted waveform, reduce reactive component of current and transmission losses, power factor is approached 1, greatly improve the quality of power supply of electrical network; And when train braking, the three-phase four-quadrant current transformer recovers its function to electrical network 1 feeding braking energy back again.
The dead beat predicted current control method that the present invention uses has follows the tracks of fast advantage, its gram Clothes existing general digital control in the factors such as control hysteresis, LPF delay to controller because electricity The sense parameter changes the impact that brings, and has reduced the robustness of controller to inductance parameters, has improved control The ability that device output processed remains unchanged.
Claims (1)
1, but the magnetic-levitation train tractive power supply system of feeding braking energy back suppresses the method for side harmonics, it is characterized in that: controller obtains the received current and the input voltage of alternating continuous-current commutating machine respectively by current sensor and voltage sensor, the alternating current of three-phase four-quadrant current transformer and DC bus-bar voltage, the micro controller system of controller or data signal processor become electric current and voltage under the rotational coordinates with above-mentioned received current and input voltage through the dq coordinate transform, electric current under this rotational coordinates and voltage are through doing projection on the voltage direction respectively with electric current behind the low-pass filter, and the difference of above-mentioned projection and the positive and negative DC bus-bar voltage result after pi controller is regulated relatively obtained the projection of the active component of current on q axle and d axle, again with the projection of this active component of current on q axle and d axle can obtain the fundamental current active component by the angular frequency inverse transform that input voltage extracts from phaselocked loop, the difference of this fundamental current active component and received current is given compensating current component, the alternating current of the three-phase four-quadrant current transformer of this compensating current component and current sensor actual detected is relatively obtained error signal, use dead-beat predicted current control method with each power switch pipe of this error signal calculation three-phase four-quadrant current transformer this moment service time at last, and open dutycycle with the turn-off time, thereby determine and send the pwm control signal of each power switch pipe of three-phase four-quadrant current transformer.
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| CN200910194594A CN101638061A (en) | 2009-08-26 | 2009-08-26 | Method for suppressing line-side harmonics of magnetic-levitation train tractive power supply system capable of feeding back braking energy |
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| CN200910194594A CN101638061A (en) | 2009-08-26 | 2009-08-26 | Method for suppressing line-side harmonics of magnetic-levitation train tractive power supply system capable of feeding back braking energy |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807918A (en) * | 2010-04-15 | 2010-08-18 | 西安交通大学 | Synchronous coordinate system-based single phase locked loop and implementation method thereof |
| CN101986497A (en) * | 2010-10-25 | 2011-03-16 | 上海磁浮交通发展有限公司 | Control compensation system and control method of quality of electric energy of magnetic suspension train |
| CN104237608A (en) * | 2013-06-18 | 2014-12-24 | 无锡市幅瑞自动化科技有限公司 | Distorted current vector detection method based on dq coordinate conversion |
| WO2016078501A1 (en) * | 2014-11-17 | 2016-05-26 | 中车青岛四方机车车辆股份有限公司 | System and method for testing network-side harmonic component of motor train unit |
| CN105897030A (en) * | 2016-06-08 | 2016-08-24 | 江苏固德威电源科技股份有限公司 | Dead beat fixed frequency model forecast control method, device and system |
| CN106026185A (en) * | 2016-07-29 | 2016-10-12 | 南京工程学院 | Three-level subway energy feedback and harmonic control integrated device and control method thereof |
| CN106444390A (en) * | 2016-12-06 | 2017-02-22 | 北京航空航天大学 | Magnetic suspension rotor harmonic current suppression method based on FIR filter and fractional-order repetitive controller |
| CN109217315A (en) * | 2017-06-29 | 2019-01-15 | 中车株洲电力机车研究所有限公司 | The control method and control device of formula traction power supply power supply can be presented |
-
2009
- 2009-08-26 CN CN200910194594A patent/CN101638061A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807918A (en) * | 2010-04-15 | 2010-08-18 | 西安交通大学 | Synchronous coordinate system-based single phase locked loop and implementation method thereof |
| CN101986497A (en) * | 2010-10-25 | 2011-03-16 | 上海磁浮交通发展有限公司 | Control compensation system and control method of quality of electric energy of magnetic suspension train |
| CN104237608A (en) * | 2013-06-18 | 2014-12-24 | 无锡市幅瑞自动化科技有限公司 | Distorted current vector detection method based on dq coordinate conversion |
| WO2016078501A1 (en) * | 2014-11-17 | 2016-05-26 | 中车青岛四方机车车辆股份有限公司 | System and method for testing network-side harmonic component of motor train unit |
| CN105897030A (en) * | 2016-06-08 | 2016-08-24 | 江苏固德威电源科技股份有限公司 | Dead beat fixed frequency model forecast control method, device and system |
| CN105897030B (en) * | 2016-06-08 | 2018-06-08 | 江苏固德威电源科技股份有限公司 | A kind of dead beat determines frequency model predictive control method, apparatus and system |
| CN106026185A (en) * | 2016-07-29 | 2016-10-12 | 南京工程学院 | Three-level subway energy feedback and harmonic control integrated device and control method thereof |
| CN106444390A (en) * | 2016-12-06 | 2017-02-22 | 北京航空航天大学 | Magnetic suspension rotor harmonic current suppression method based on FIR filter and fractional-order repetitive controller |
| CN106444390B (en) * | 2016-12-06 | 2019-03-29 | 北京航空航天大学 | A kind of magnetic suspension rotor method for inhibiting harmonic current based on FIR filter and fractional order repetitive controller |
| CN109217315A (en) * | 2017-06-29 | 2019-01-15 | 中车株洲电力机车研究所有限公司 | The control method and control device of formula traction power supply power supply can be presented |
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Open date: 20100203 |