CN105186890B - The method that AC drive vehicle transless controls direct current output - Google Patents
The method that AC drive vehicle transless controls direct current output Download PDFInfo
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- CN105186890B CN105186890B CN201510562741.3A CN201510562741A CN105186890B CN 105186890 B CN105186890 B CN 105186890B CN 201510562741 A CN201510562741 A CN 201510562741A CN 105186890 B CN105186890 B CN 105186890B
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Abstract
The invention discloses the method for AC drive vehicle transless topological structure and control direct current output, topological structure includes mutually cascade two or more converting units；The converting unit includes controller, pulse rectifier, resistance and inductance.The method for controlling direct current output includes electric to pulse rectifier input AC through resistance and inductance by power grid, direct current is exported by pulse rectifier, controller controls pulse rectifier according to ac voltage signal, ac current signal, d. c. voltage signal, DC current signal and DC voltage given value, and pulse rectifier is allowed to have stable direct current output.Present invention eliminates transformer, direct current output is stablized.
Description
Technical field
The present invention relates to AC drive vehicle transless topological structure and the methods for controlling direct current output.
Background technology
Currently, drawing the structure of electric drive system on traditional high-power electric locomotive or EMU is：Contact
Net-tractive transformer-rectifier-intermediate DC circuit-inverter-traction electric machine.Wherein, tractive transformer is heavy, makes
High price is expensive, and occupies a large amount of space, the weight and manufacturing cost of locomotive has both been increased, also in train traction or regenerative braking
When, copper loss and iron loss are generated, utilization rate of electrical is made to reduce.In addition, transformer can also bring a series of problems, such as Wen Sheng, leakage reactance.
Invention content
In order to remove transformer, avoid the problem that transformer is brought, in order to allow each converting unit that there is stable direct current
Output ensures voltage stabilization between each converting unit and does not influence each other that the present invention provides a kind of AC drive vehicles without change
Depressor topological structure and the method for controlling direct current output.
In order to achieve the above objectives, AC drive vehicle transless topological structure, including mutual cascade two or more
Converting unit；The converting unit includes controller, pulse rectifier, resistance and inductance, and controller receives the friendship of grid side
Flow voltage signal UacWith ac current signal Iac, while controller receives the d. c. voltage signal U of pulse rectifier output enddc
With DC current signal Idc, the output end of controller is connected with pulse rectifier, with DC voltage given value on controller
Input terminal；Controller is by DC voltage UdcWith DC voltage given valueIt is compared, the difference compared is input to controller
In pi regulator in, pi regulator exports reference current IN1；As reference current IN1Increase, controller controls pulse rectifier
Input current increase, to make the output current of pulse rectifier increase；As reference current IN1Reduce, controller controls pulse
The input current of rectifier reduces, to make the output current of pulse rectifier reduce；Above-mentioned control process repeatedly, allows direct current
Press UdcRelative to DC voltage given valueChange in given range；The output end of resistance is connect with grid side, resistance it is defeated
Outlet is connected by connecting with inductance with pulse rectifier.
AC drive vehicle transless control direct current output method be：Power grid to mutually cascade two or more turn
Unit power supply is changed, each converting unit divides the voltage of power grid, and exchange is converted to direct current output by converting unit；Specifically
Process is：In each converting unit, power grid passes through the resistance R and capacitance L that are serially connectedNPulse rectifier is supplied electricity to, in arteries and veins
It rushes alternating current in rectifier and is converted to direct current electricity output；Pulse rectifier passes through control in exchange is converted to direct current process
Device controls the direct current output of pulse rectifier, and specific process is：The alternating current of controller detection grid side in converting unit
Press Uac, alternating current IacWith the DC voltage U of pulse rectifier output enddc, DC current Idc, while being inputted into controller
One DC voltage given valueBy DC voltage UdcWith DC voltage given valueIt is compared, the difference compared is inputted
Into the pi regulator in controller, pi regulator exports reference current IN1；As reference current IN1Increase, controller controls arteries and veins
The input current for rushing rectifier increases, to make the output current of pulse rectifier increase；As reference current IN1Reduce, controller
The input current for controlling pulse rectifier reduces, to make the output current of pulse rectifier reduce；Above-mentioned control process repeatedly,
Allow DC voltage UdcRelative to DC voltage given valueChange in given range.
The method of above topology structure and control direct current output, since voltage of multiple converting units to grid side is utilized
It is divided, alternating current is converted into direct current using pulse rectifier, to eliminate transformer, it is stupid to solve transformer
Weigh, involve great expense, occupying the technical issues of big quantity space, also solve in train traction or regenerative braking generate copper loss and
The technical issues of iron loss, makes utilization rate of electrical height.In addition, also solving transformer brings a series of technology such as Wen Sheng, leakage reactance
Problem.In the present invention, as a result of the comparative approach of controller, to ensure DC voltage UdcIt is given relative to DC voltage
Definite valueChange in given range, ensure voltage stabilization between each converting unit and do not influence each other, recited herein gives
It refers to the edge in ± U values to determine range, and U values are set as needed.
Further, the pulse rectifier is three level pulse rectifiers, wherein the poles A of three level pulse rectifiers
It is connect with the output end of inductance, the poles B of three level pulse rectifiers are connect with the poles A of adjacent converting unit, and three level pulses are whole
The output end of the poles g and controller of flowing device connects.
Further, the first capacitance is provided between three level pulse rectifier output cathodes and the poles N, in three level arteries and veins
It rushes between the cathode of rectifier and the poles N and plays balance due to being provided with the first capacitance and the second capacitance provided with the second capacitance
The effect of voltage ensures N extremely 0 current potentials.
Further, AC voltage sensor is parallel on pulse rectifier, controller receives AC voltage sensor
Ac voltage signal；AC current sensor is in series between grid side and resistance, controller receives ac current sensor
Ac current signal on device.
Further, it is parallel with direct current voltage sensor in the output end of pulse rectifier, controller receives DC voltage
The d. c. voltage signal of sensor；It is in series with DC current sensor in the output end of pulse rectifier, controller receives direct current
The DC current signal of current sensor.Due to being provided with AC voltage sensor, AC current sensor, DC voltage sensing
Therefore device and DC current sensor easily and accurately obtain alternating voltage, alternating current, DC voltage and DC current.
Further, according toAnd UdcObtain IN1Method be：
Wherein, KpIn order to control in device pi regulator proportionality coefficient, TiThe time of integration of pi regulator is normal in device in order to control
Number.
Further, voltage U is generated in the controllersSignal, by voltage UsThe waveform of signal is converted into pulse signal, leads to
Extra pulse signal controls pulse rectifier, generates voltage UsThe process of signal is：
(1) in the controller, according to Idc、UdcAnd UNCalculate reference current value IN2；
IN2=IdcUdc/UN
Wherein, UNFor exchange side voltage effective value；
(2) in the controller, according to IN1And IN2Calculate IN1And IN2And value IN ※
IN ※=IN1+IN2
(3) in the controller, U is calculateds；
Wherein, R is resistance value, LNFor inductance value, ω is the angular frequency of grid side voltage, G2For rate mu-factor, iNFor
Ac-side current virtual value.
On the other hand the above method, the signal that on the one hand can be identified in order to which pulse rectifier can be received pass through
Above-mentioned calculating can be more accurately controlled signal.
Description of the drawings
Fig. 1 is the topology diagram of the present invention.
Fig. 2 is the oscillogram of pulse rectifier output.
Specific implementation mode
As shown in Figure 1, AC drive vehicle transless topological structure includes mutually cascade two or more conversion lists
Member 100, the cascade refers to being divided using converting unit, and each converting unit all has output end.The conversion
Unit 100 includes controller 1, pulse rectifier 2, resistance 3 and inductance 4.
Controller 1 has DC voltage given value input terminal, ac voltage signal input terminal, ac current signal input
End, d. c. voltage signal input terminal, DC current signal input terminal and output end p ulse.DC voltage given value input termination
Receive DC voltage given valueAc voltage signal input terminal receives the ac voltage signal U from AC voltage sensorac,
Ac current signal input terminal receives the ac current signal I from AC current sensorac, d. c. voltage signal input termination
Receive the d. c. voltage signal U from direct current voltage sensordc, DC current signal input terminal, which receives, comes from DC current sensor
DC current signal Idc, the poles the g connection of output end p ulse and pulse rectifier.
The pulse rectifier 2 is three level pulse rectifiers, wherein the poles A of three level pulse rectifiers and inductance 4
Output end connection, the poles B of three level pulse rectifiers and the poles A of three level pulse rectifiers in adjacent converting unit connect
It connects, the poles g of three level pulse rectifiers are connect with the output end p ulse of controller 1.
The first capacitance 5 is provided between three level pulse rectifier output cathodes and the poles N, in three level pulse rectifiers
Cathode and the poles N between be provided with the second capacitance 6, play the role of balanced voltage, ensure N extremely 0 current potentials.
Resistance 3 and inductance 4 are sequentially connected in series, and the output end of resistance 3 is connected to the input terminal of inductance 4.The input terminal of resistance 3 with
200 side of power grid connects.
It is parallel with alternating voltage between three poles level pulse rectifier B in grid side 200 and first converting unit
Sensor 7；The three level pulse poles rectifier B in second converting unit and three level pulses in first converting unit are whole
Stream is parallel with AC voltage sensor between device B poles, the three level pulse poles rectifier B in third converting unit and second
Be parallel with AC voltage sensor between three poles level pulse rectifier B in converting unit, and so on until second from the bottom
A converting unit is parallel with AC voltage sensor 7 between three poles level pulse rectifier B in the last one converting unit,
The ac voltage signal input terminal of controller receives the ac voltage signal of AC voltage sensor 7.In 200 side of power grid and resistance
AC current sensor 8 is in series between 3, the ac current signal input terminal of controller receives on AC current sensor 8
Ac current signal.It is parallel with direct current voltage sensor 9, the d. c. voltage signal of controller in the output end of pulse rectifier 2
Input terminal receives the d. c. voltage signal of direct current voltage sensor 9；Direct current is in series in the output end of pulse rectifier to spread
Sensor 10, the DC current signal input terminal of controller receive the DC current signal of DC current sensor 10.Pass through exchange
Voltage sensor 7, AC current sensor 8, direct current voltage sensor 9 and DC current sensor 10 can intuitively, it is accurate
To alternating voltage, alternating current, DC voltage and DC current.
In order to more intuitively obtain curent change the case where, be connected with first in the output end of AC current sensor
Display screen 11 is connected with second display screen 12 on the output end of DC current sensor.
AC drive vehicle transless control direct current output method include：Power grid 200 to mutually cascade two with
On converting unit 100 power, each converting unit 100 divides the voltage of power grid, and converting unit 100 is converted to exchange
Direct current output；Specifically process is：In each converting unit 100, power grid 200 passes through the resistance R and capacitance L that are serially connectedN
Pulse rectifier 2 is supplied electricity to, alternating current is converted to direct current electricity output in pulse rectifier 2；Pulse rectifier 2 turns in exchange
It is changed in direct current process, the direct current output of pulse rectifier 2 is controlled by controller 1, specific process is：In converting unit
Controller 1 detects the alternating voltage U of 200 side of power gridac, alternating current IacWith the DC voltage U of pulse rectifier output enddc, it is straight
Galvanic electricity stream Idc, while a DC voltage given value is inputted into controller 2By DC voltage UdcWith DC voltage given valueIt is compared, the difference compared is input in the pi regulator in controller, pi regulator exports reference current IN1, root
According toAnd UdcObtain IN1Method be：
Wherein, KpIn order to control in device pi regulator proportionality coefficient, TiThe time of integration of pi regulator is normal in device in order to control
Number.
I is obtainedN1Generate voltage U in the controller afterwardssSignal, then by voltage UsThe waveform of signal is converted into pulse letter
Number, pulse rectifier 2 is controlled by pulse signal and is worked, voltage U is generatedsThe process of signal is：
(1) in the controller, according to Idc、UdcAnd UNCalculate reference current value IN2；
IN2=IdcUdc/UN
Wherein, UNFor exchange side voltage effective value；
(2) in the controller, according to IN1And IN2Calculate IN1And IN2And value IN ※
IN ※=IN1+IN2
(3) in the controller, U is calculateds；
Wherein, R is resistance value, LNFor inductance value, ω is the angular frequency of grid side voltage, G2For rate mu-factor, iNFor
Ac-side current virtual value.
It is by the method that pulse signal controls pulse rectifier：As DC voltage UdcLess than DC voltage given value
Reference current IN1Increase, USIt changes, pulse signal also follows variation, and pulse rectifier is controlled by the pulse signal of variation
Input current increase, to make the output current of pulse rectifier increase；As DC voltage UdcMore than DC voltage given valueReference current IN1Reduce, USIt changes, pulse signal also follows variation, and it is whole to control pulse by the pulse signal of variation
The input current for flowing device reduces, to make the output current of pulse rectifier reduce；Above-mentioned control process repeatedly, allows DC voltage
UdcRelative to DC voltage given valueChange in given range, i.e. DC voltage UdcIn DC voltage given valueOn
Lower fluctuation, realization are accurately controlled, and are allowed pulse rectifier to have and are stablized, accurately export, ensure voltage between each converting unit
Stablize and do not influence each other, as shown in Figure 2.Given range recited herein refers to the edge in ± U values, and U values are as needed
Setting.
In the present invention, it in order to test the operating condition of the structure, can be connected on the output end of pulse rectifier 2 equivalent
Load 13.
In actual use, equivalent load 13 is canceled, inverter is connected in the output end of pulse rectifier 2,
Motor is connected on inverter.
Topological structure using the present invention and method divide the voltage of 200 side of power grid using multiple converting units 100
Pressure, direct current is converted to using pulse rectifier 2 by alternating current so that the output end of each converting unit has stable direct current
Output solves transformer heaviness, involves great expense, occupies the technical issues of big quantity space, also solve to eliminate transformer
The technical issues of copper loss and iron loss are generated in train traction or regenerative braking, makes utilization rate of electrical height.In addition, also solving
Transformer brings a series of technical problem such as Wen Sheng, leakage reactance.
Claims (1)
1. the method that AC drive vehicle transless controls direct current output, it is characterised in that：Power grid is to mutually cascade two
The above converting unit power supply, each converting unit divide the voltage of power grid, and it is defeated that exchange is converted to direct current by converting unit
Go out；Specifically process is：In each converting unit, power grid passes through the resistance R and capacitance L that are serially connectedNIt is whole to supply electricity to pulse
Device is flowed, alternating current is converted to direct current electricity output in pulse rectifier；Pulse rectifier in exchange is converted to direct current process,
The direct current output of pulse rectifier is controlled by controller, specific process is：Controller in converting unit detects grid side
Alternating voltage Uac, alternating current IacWith the DC voltage U of pulse rectifier output enddc, DC current Idc, while to control
A DC voltage given value is inputted in deviceBy DC voltage UdcWith DC voltage given valueIt is compared, by what is compared
Difference is input in the pi regulator in controller, and pi regulator exports reference current IN1；As reference current IN1Increase, control
The input current that device controls pulse rectifier increases, to make the output current of pulse rectifier increase；As reference current IN1Subtract
Small, the input current that controller controls pulse rectifier reduces, to make the output current of pulse rectifier reduce；It is repeatedly above-mentioned
Control process, allows DC voltage UdcRelative to DC voltage given valueChange in given range；
According toAnd UdcObtain IN1Method be：
Wherein, KpIn order to control in device pi regulator proportionality coefficient, TiIn order to control in device pi regulator integration time constant；
Voltage U is generated in the controllersSignal, by voltage UsThe waveform of signal is converted into pulse signal, is controlled by pulse signal
Pulse rectifier generates voltage UsThe process of signal is：
(1) in the controller, according to Idc、UdcAnd UNCalculate reference current value IN2；
IN2=IdcUdc/UN
Wherein, UNFor exchange side voltage effective value；
(2) in the controller, according to IN1And IN2Calculate IN1And IN2And value IN ※
IN ※=IN1+IN2
(3) in the controller, U is calculateds；
Wherein, R is resistance value, LNFor inductance value, ω is the angular frequency of grid side voltage, G2For rate mu-factor, iNFor exchange
Side current effective value.
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| CN201510562741.3A CN105186890B (en) | 2015-09-07 | 2015-09-07 | The method that AC drive vehicle transless controls direct current output |
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| CN1610231A (en) * | 2003-10-24 | 2005-04-27 | 力博特公司 | Commutator and control method thereof |
| CN101306653A (en) * | 2008-04-08 | 2008-11-19 | 北京交通大学 | Traction power supply equipment based on PWM rectifier and control method |
| CN103368407A (en) * | 2012-03-15 | 2013-10-23 | 洛克威尔自动控制技术股份有限公司 | Power converter and integrated DC choke therefor |
| CN103986344A (en) * | 2014-05-30 | 2014-08-13 | 山东大学 | System and method for controlling unit power factor single-level AC-DC converter |
| CN104682728A (en) * | 2015-03-23 | 2015-06-03 | 南车株洲电力机车研究所有限公司 | Traction power electronic transformer as well as control method and system for power electronic transformer |
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2015
- 2015-09-07 CN CN201510562741.3A patent/CN105186890B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5793624A (en) * | 1996-06-05 | 1998-08-11 | Hydro-Quebec | Apparatus and method for charging a DC battery |
| CN1610231A (en) * | 2003-10-24 | 2005-04-27 | 力博特公司 | Commutator and control method thereof |
| CN101306653A (en) * | 2008-04-08 | 2008-11-19 | 北京交通大学 | Traction power supply equipment based on PWM rectifier and control method |
| CN103368407A (en) * | 2012-03-15 | 2013-10-23 | 洛克威尔自动控制技术股份有限公司 | Power converter and integrated DC choke therefor |
| CN103986344A (en) * | 2014-05-30 | 2014-08-13 | 山东大学 | System and method for controlling unit power factor single-level AC-DC converter |
| CN104682728A (en) * | 2015-03-23 | 2015-06-03 | 南车株洲电力机车研究所有限公司 | Traction power electronic transformer as well as control method and system for power electronic transformer |
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| CN105186890A (en) | 2015-12-23 |
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