CN104868795B

CN104868795B - Railway locomotive cooling fan motor method for starting-controlling

Info

Publication number: CN104868795B
Application number: CN201510284672.4A
Authority: CN
Inventors: 蔡志伟; 杨曦亮; 徐朝林; 宋杨; 陆璐
Original assignee: China Railway Corp; CNR Dalian Locomotive and Rolling Stock Co Ltd
Current assignee: China State Railway Group Co Ltd; CRRC Dalian Co Ltd
Priority date: 2015-05-28
Filing date: 2015-05-28
Publication date: 2017-07-07
Anticipated expiration: 2035-05-28
Also published as: NZ714326A; ZA201700519B; CN104868795A; AU2015258260A1; WO2016188007A1; AU2015258260B2

Abstract

The invention discloses a kind of railway locomotive cooling fan motor method for starting-controlling, first set inverter output frequency desired value as lower value F1, and inverter output frequency is controlled by relatively low LOADING RATES Rp1, after inverter output frequency reaches F1, kept for F1 to the T1 moment.From starting up to the T1 moment, the smaller limited in two closed-loop control output valves with output current limitation and middle dc voltage is multiplied with modulation degree Mi and obtains new modulation degree ML, control inverter output voltage, output current is limited within the scope of given maximum starting current, and middle dc voltage is limited in the range of DC voltage limits value.At the T1 moment, inverter output frequency desired value as high value F2 is set, inverter output frequency is controlled by compared with high loading rate Rp2, F2 is reached at the T2 moment.Smooth start of the fan electromotor under any initial speed and steering condition is capable of achieving, the overvoltage of inverter medium voltage is prevented.

Description

Railway locomotive cooling fan motor method for starting-controlling

Technical field

Control is started the present invention relates to a kind of motor starting control method, more particularly to a kind of railway locomotive cooling fan motor Method processed, belongs to railway locomotive technical field.

Background technology

With the fast development of Power Electronic Technique, the application of current transformer is more and more extensive, in industrial control field, often Fan electromotor is driven using current transformer, and then realizes accurate fan motor rotational speed control.However, in railway locomotive application scenario Under, being constrained by conditions such as cost and installing spaces, the spindle nose of cooling fan motor cannot install rotating speed coder.In many feelings Under condition, when current transformer is started, fan electromotor initial speed higher, and it turns to and does not know.If current transformer is from It is dynamic to export three-phase alternating current to cooling fan motor by certain frequency, voltage build-up rate at the very start, then can make rising for motor Streaming current is excessive, brings vibration to mechanically and electrically system and impacts, or even triggering overcurrent protection, the reliable fortune of influence system OK.

The content of the invention

It is an object of the invention to provide a kind of railway locomotive that smooth start can be realized under any initial speed and steering Cooling fan motor method for starting-controlling.

The technical solution adopted for the present invention to solve the technical problems is：

A kind of railway locomotive cooling fan motor method for starting-controlling, using Driven by inverter cooling fan motor, it is special It is to set inverter output frequency first object value F1 and the second desired value F2 to levy, and F1 ＜ F2, the first LOADING RATES Rp1 and the Two LOADING RATES Rp2, and Rp1 ＜ Rp2, during starting, first control inverter output frequency Fd by the first LOADING RATES Rp1, work as inverter Output frequency Fd is kept for output frequency F1 to the T1 moment after the T0 moment reaches first object value F1, from the T1 moment, by plus Load rate Rp2 controls inverter output frequency Fd progressivelyes reach the second desired value F2；To the T1 moment since electric motor starting, using defeated Go out current limit and middle dc voltage limitation double-closed-loop control, output current limitation closed loop output control value VD1out, and limit System 0≤VD1out≤100%, medium voltage limitation closed loop output control value VD2out, and limitation 0≤VD2out≤100%；Take The middle smaller of both VD1out, VD2out is controlling value VDout, and it is fan inversion to make modulation degree ML=VDout*Mi, wherein Mi Device opened loop control modulation degree, inverter output voltage is controlled with ML, output current is limited in given maximum starting current model Within enclosing, and middle dc voltage is set to be limited in the range of DC voltage limits value.

In order to the purpose of the present invention is better achieved, the T1 moment is determined in the steps below：Setting output current is effective Value threshold value Icmp, the time setting value Ccmp2 of time the setting value Ccmp1 and timer Cnt2 of timer Cnt1, and Ccmp1 ＞ Ccmp2, timer Cnt1 when inverter output frequency Fd reaches F1 timing, timer Cnt2 is from output current virtual value Ifdb starts timing when being less than current effective value threshold value Icmp, arrives first the as T1 moment at moment of time setting value.

The beneficial effects of the invention are as follows the fan electromotor method for starting-controlling can realize fan electromotor with initial speed And under conditions of steering is indefinite, limited and middle dc voltage limitation double-closed-loop control by using output current, achievable wind The stable low-frequency brake control of fan motor, with reference to the determination method at T1 moment, increases on the basis of the default low-frequency brake time Output circuit is detected and delays time to control link, it is ensured that after low-frequency brake terminates, immediately enter raising speed speed-regulating mode.This controlling party Method can eliminate the big impact to electrically and mechanically system of fan electromotor starting current, and prevent due to the inversion that braking is caused Device middle dc voltage overpressure problems.

Brief description of the drawings

Fig. 1 powers main circuit principle schematic for the cooling fan motor of the embodiment of the present invention.

Fig. 2 is the cooling fan motor starting process frequency time Fd-t curve maps of the embodiment of the present invention；

Fig. 3 is the interruption subroutine flow chart of timer 1 of the embodiment of the present invention；

Fig. 4 is the fan electromotor startup subroutine flow chart of the embodiment of the present invention；

Fig. 5 is the T1 moment of the embodiment of the present invention to indicate and judge subroutine flow chart.

Specific embodiment

It is right with reference to the accompanying drawing in the embodiment of the present invention to make the object of the invention, technical scheme and advantage clearer Technical scheme is clearly fully described by, it is clear that described embodiment is a part of embodiment of the invention, and It is not all, of embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creative work Under the premise of the every other embodiment that is obtained, belong to the scope of protection of the invention.

Cooling fan motor referring to Fig. 1 embodiment of the present invention is powered main circuit principle schematic.Three-phase alternating voltage is certainly U, V, W binding post are accessed, by three-phase ac contactor CTT1, input to the three phase rectifier electricity being made up of diode D1~D6 Road is changed into direct current, by median filter circuit C1, input to the three-phase inverter circuitry being made up of S1~S6, be changed into voltage, The three-phase alternating current of frequency-adjustable, output to cooling fan motor M1.

Referring to the fan electromotor starting process frequency time Fd-t curve maps of Fig. 2 embodiment of the present invention.Electric motor starting moment t =0, Fd=0, control inverter output frequency Fd, when inverter output frequency Fd reaches the mesh at the T0 moment by LOADING RATES Rp1 After scale value F1, kept for output frequency F1 to the T1 moment.From the electric motor starting moment to the T1 moment, closed loop is limited using output current Closed-loop control double-closed-loop control is limited with middle dc voltage, the minimum value exported with two closed-loop controls and inverter open loop control System Mi is multiplied and obtains new modulation degree ML, and inverter output voltage is controlled with ML, output current is limited in given maximum Within the scope of starting current, and middle dc voltage is set to be limited in the range of DC voltage limits value.At the T1 moment, by inverter Output frequency desired value is set to working frequency F2, and the work is progressivelyed reach frequently by LOADING RATES Rp2 controls inverter output frequency Fd Rate F2.

Referring to the interruption subroutine flow chart of timer 1 of Fig. 3 embodiment of the present invention.The present embodiment application timer 1 is interrupted Produce 10mS Interruptions.Interruption subroutine is interrupted in the Off Timer 1 of frame 1.1 first, and removing timer 1 in frame 1.2 interrupts Mark.Subsequently into frame 1.3, judge whether enabled instruction is true：If it is, into frame 1.4, performing fan electromotor promoter Program, otherwise into frame 1.5, performs fan electromotor and stops subprogram.Subsequently into frame 1.6, open timer 1 and interrupt, under Timer 1 is interrupted gets ready.Then interruption subroutine end of run.

Referring to the fan electromotor startup subroutine flow chart of Fig. 4 embodiment of the present invention.Fan electromotor startup subroutine 1.4, Performed in frame 1.4.1 first and calculate frequency targets F2, called the T1 moment to indicate subsequently into frame 1.4.2 execution and judge subprogram, Judge whether T1Flag==1 subsequently into frame 1.4.3：If it is, judging whether Fd into left frame 1.4.6 programs<F2, such as Fruit is to perform Fd=Fd+Rp2 into frame 1.4.7, is performed subsequently into frame 1.4.11 and sets modulation degree controlling value Vdout=1, The minimum value calculated during modulation degree controlling value VDout is equal to VD1out and VD2out is performed subsequently into frame 1.4.13；Frame 1.4.6 Program judges whether Fd<F2：If not, entering into frame 1.4.8 performs Fd=F2, perform to set then into frame 1.4.11 and adjust System control value Vdout=1, performed then into frame 1.4.13 calculate modulation degree controlling value VDout be equal to VD1out with Minimum value in VD2out；Into frame 1.4.3 determining programs whether T1Flag==1：If not, judging journey into frame 1.4.4 Sequence whether Fd<F1：If not, performing Fd=F1 into frame 1.4.9, then performed to frame 1.4.10 Iref and Ifdb feedings is defeated Go out electric current PID controller VD1 and output control value VD1out, and limitation 0≤VD1out≤1；Frame 1.4.4 determining programs whether Fd <F1, if it is, entering into frame 1.4.5 performs Fd=Fd+Rp1, performs Iref and Ifdb feedings is defeated subsequently into frame 1.4.10 Go out electric current PID controller VD1 and output control value VD1out, and limitation 0≤VD1out≤1, performed subsequently into frame 1.4.12 By VdcRef and VdcFdb feeding medium voltage PID controller VD2, and output control VD2out, and limitation 0≤VD2out≤1, The minimum value calculated during modulation degree controlling value VDout is equal to VD1out and VD2out, Ran Houjin are performed subsequently into frame 1.4.13 Enter frame 1.4.14 and perform calculating initial modulation degree Mi=Fd/Fmax, performed subsequently into frame 1.4.15 and calculate final modulation degree ML =VDout*Mi, then program end of run.

The T1 moment referring to Fig. 5 embodiment of the present invention indicates and judges subroutine flow chart.The T1 moment indicates and judges subprogram 1.4.2, Fd is judged whether in frame 1.4.2.1 programs first<F1：If it is, performing Cnt1=0, Ran Houjin into frame 1.4.2.3 Enter frame 1.4.2.8 and perform T1Flag=0；1.4.2.1 Fd is judged whether<F1, if not, entering into frame 1.4.2.2 performs Cntl =Cntl+1, Ifdb is judged whether subsequently into frame 1.4.2.4<Icmp：If not, entering into frame 1.4.2.10 performs Cnt2= 0, then perform T1Flag=0 to frame 1.4.2.8；1.4.2.4 program judges whether Ifdb<Icmp, if it is, entering into frame 1.4.2.5 Cnt2=Cnt2+1 is performed, Cnt1==Ccmp1 is judged whether subsequently into frame 1.4.2.6 programs：If it is, entering Enter to frame 1.4.2.9 and perform T1Flag=1；1.4.2.6 program judges whether Cnt1==Ccmp1：If not, into 1.4.2.7 program judges whether Cnt2==Ccmp2：If it is, operation frame 1.4.2.9 performs T1Flag=1；1.4.2.7 journey Sequence judges whether Cnt2==Ccmp2：If not, operation frame 1.4.2.8 performs T1Flag=0, then program end of run.

Claims

1. a kind of railway locomotive cooling fan motor method for starting-controlling, using Driven by inverter cooling fan motor, its feature It is to set inverter output frequency first object value F1 and the second desired value F2, and F1 ＜ F2, the first LOADING RATES Rp1 and second LOADING RATES Rp2, and Rp1 ＜ Rp2, during starting, first control inverter output frequency Fd, when inverter is defeated by the first LOADING RATES Rp1 Go out frequency Fd after the T0 moment reaches first object value F1, kept for output frequency F1 to the T1 moment, from the T1 moment, by loading Rate Rp2 controls inverter output frequency Fd progressivelyes reach the second desired value F2；To the T1 moment since electric motor starting, using output Current limit and middle dc voltage limitation double-closed-loop control, output current limitation closed loop output control value VD1out, and limitation 0 ≤ VD1out≤100%, medium voltage limitation closed loop output control value VD2out, and limitation 0≤VD2out≤100%；Take The middle smaller of both VD1out, VD2out is controlling value VDout, and it is fan inversion to make modulation degree ML=VDout*Mi, wherein Mi Device opened loop control modulation degree, inverter output voltage is controlled with ML, output current is limited in given maximum starting current model Within enclosing, and middle dc voltage is set to be limited in the range of DC voltage limits value.

2. railway locomotive cooling fan motor method for starting-controlling according to claim 1, it is characterised in that by following steps Suddenly the T1 moment is determined：Setting output current virtual value threshold value Icmp, the time setting value Ccmp1 of timer Cnt1 and timing The time setting value Ccmp2 of device Cnt2, and Ccmp1 ＞ Ccmp2, timer Cnt1 opened when reaching F1 from inverter output frequency Fd Beginning timing, timer Cnt2 since output current virtual value Ifdb be less than current effective value threshold value Icmp when timing, first then Between moment of setting value be the T1 moment.