CN101396970A - Electric locomotive power factor compensation control method and device - Google Patents
Electric locomotive power factor compensation control method and device Download PDFInfo
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- CN101396970A CN101396970A CNA200710035844XA CN200710035844A CN101396970A CN 101396970 A CN101396970 A CN 101396970A CN A200710035844X A CNA200710035844X A CN A200710035844XA CN 200710035844 A CN200710035844 A CN 200710035844A CN 101396970 A CN101396970 A CN 101396970A
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Abstract
The invention discloses a power factor compensation control method of an electric locomotive and a device thereof. According to the detection of network voltage and the current flowing into the locomotive, spectral analysis is carried out; by reading active power and reactive power, a power factor is calculated; and then the switching of a power compensation branch is decided according to the power factor and the network voltage; according to the voltage polarity of a thyristor switch of the power compensation branch, the switch pulse of the thyristor is decided; by collecting the current of the branch and making spectral analysis, whether the current is overcurrent or not is judged; if the current is overcurrent, the reasons thereof can be analyzed and relevant protective measures can be taken; and then information on the working state of a power factor compensation device, the network voltage, the current of the locomotive, the current of each branch can be transmitted to a locomotive microcomputer monitor by a communication mouth and displayed by the monitor. The power compensation control device consists of two 6U board plug-ins. One 6U board plug-in is an interface board which comprises a treatment part of an input/output analog signal and a digital signal; the other 6U board plug-in is a control board which comprises a power calculation part of the active power and the reactive power, a switching part of a power factor compensation branch and a failure treatment part.
Description
Technical field
The present invention relates to a kind of electric locomotive traction apparatus control method and device, is a kind of electric locomotive traction plant capacity factor compensation control method and device specifically, is mainly used in the electric traction equipment control of electric locomotive.
Background technology
At home, hand over the moving electric locomotive that direct transfers to be still main force's vehicle of railway passenger and freight fortune at present, its enormous amount and will be in a very long time with hand over the orthogonal transmission electric power locomotive and deposit utilization.Moving electric locomotive is because adopt the phase control rectifier circuit but friendship in the market direct transfers, and power factor generally is lower than 0.85 in operational process, can carry a large amount of reactive volt-amperes and harmonic current to electrical network.Friendship direct transfers and moves power factor compensation (being designated hereinafter simply as " merit the benefit ") device that electric locomotive is installed, and realizes reactive-load compensation on the spot and harmonic wave current filtering, idle and harm harmonic wave can be reduced to minimum.
Since the entrucking eighties in last century, 8K (European 50Hz group company provide), the merit that the independently developed Shaoshan of 6G (MIT provides) and China series (SS4G, SS4B and SS6B etc.) shipping hands over the moving electric locomotive that direct transfers to install is mended device and can not normally be moved always, the device excision is all mended merit in most electric locomotives, and its effect does not obtain performance.On the one hand number is mended device with hundreds of millions yuan vehicle-mounted merit and is not played a role, and annual on the other hand electric railway is imposed a fine number in necessarily because power factor is lower than standard.Existing merit is mended control setup and is used for the control that electric locomotive power is mended device, is mainly finished by compensate control plate in the electronic housing and compensation interface board.Wherein said compensate control plate adopts Z80CPU and peripheral circuit to constitute a dedicated microcomputer plate, is used for original edge voltage signal, primary current signal are sampled, and calculates idle content, comprehensive distinguishing various logic, input and excision that the decision merit is mended device.Described compensation interface board is used to differentiate the filtered circuit of the thyristor switch voltage zero-cross moment, detecting device and generates the input pulse.Existing merit is mended the reactive-load compensation ability of control setup according to microcomputer actual measurement idle size of locomotive and Dan Zugong benefit branch road, determines each merit to mend the input and the excision of branch road, and compensate to the idle amount of locomotive is minimum value as far as possible.When locomotive is brought into play the following operating mode of 50% rating horsepower, also adequate compensation according to circumstances.And merit can be excised through 500ms after mending every group of branch road input at least.After every group of branch road excision, can drop into again through 500ms at least.Mending the control setup neutralization in existing merit also is provided with: overcurrent protection (is promptly mended filtered circuit effective value in the device (real be aviation value) or peak value surpasses the protection value and time length surpasses 500ms when merit; Block the trigging pulse that this group merit is mended the branch road thyristor switch, simultaneously corresponding red-fault lamp (V27A-V30A) bright.When merit more than two groups is mended the branch road overcurrent, block the trigging pulse of whole thyristor switchs), to start protection (be that locomotive is when starting, if the maximum motor electric current is greater than 840A, microcomputer resets, merit is mended device and is not worked), high net press protection (be the original edge voltage effective value greater than 29.5kV, when time length surpasses 500ms, block the trigging pulse of whole thyristor switchs; Have only when original edge voltage effective value during less than 27.5kV, branch road can drop into again), logic error protection is (promptly at main contactor (isolation plug-in strip) closure state, detected electric current and do not drop into signal or signal is arranged and when not having electric current, block the trigging pulse that cooresponding merit is mended the device thyristor switch; While output protection signal; connect merit through Electric device with a contact and mend not under command light; and disconnect merit and mend contactless switch) and the hardware control system emergency protection (be that system detects and finds the signal of input is arranged and do not have the feedback signal of input or do not have the signal of input and when the input feedback signal is arranged; corresponding V27～V30A is bright for control desk; simultaneously the output protection signal is connected the driver's cab not under command light through Electric device with a contact) etc. function.
But existing merit benefit device remains at merit benefit electric capacity and burns; Merit is mended the branch road frequent switching, can not be from recovering after the fault; Merit is mended the poor anti jamming capability of control setup; Merit is mended because of deficiencies such as momentary excess current misoperations.Specifically describe as follows:
1) the current protection mode is improper, and the distortion of locomotive merit benefit branch current is serious, and up to 78% of fundamental current, the average current on the therefore present locomotive behind the employing rectifying and wave-filtering can not accurately reflect current effective value as 3 subharmonic currents, adopts the average current protection improper.
2) frequent switching that causes after the overcurrent protection action, existing control setup excises this merit because of the misoperation protection and mends branch road; After merit was mended the branch road excision, the merit that has dropped into was mended the branch road harmonic current and can be increased, and easier the action because of overcurrent protection excised.This chain reaction meeting causes all branch roads to withdraw from because of overcurrent.After all branch roads withdraw from, drop into again after a while, if locomotive operating mode and line voltage are constant, the branch road that drops into can withdraw from because of overcurrent at once at first, merit benefit device at all can't normal operation like this.
3) both meritorious the benefit controlled merit benefit branch road with the reactive volt-amperes size and carried out switching, when reactive power Q drops into one group during more than or equal to 480kvar, all drops into up to four groups; When reactive power Q excises one group during less than 120kvar, up to four groups of complete resections.It is frequent that merit was mended the branch road switching when this mono-compensate control principle caused load variations, and this life-span to electric elements in the branch road is influential.
4) the both meritorious control setup of mending decides merit to mend the switching of branch road according to the idle size of locomotive, but Q=UIsin θ method of calculating has been adopted in idle detection, and U, I calculate by line voltage u and current i discretization, and θ then obtains by the i phase angle of u.Because u and i are non-sinusoidal quantities, determine that by its zero passage θ must cause the sum of errors instability.Idle calculating is unstable, causes also mal of switching that merit mends branch road, and frequent switching easily takes place.
5) merit of former meritorious benefit control setup benefit branch current signal is after becoming voltage signal by current transformer, passes to merit by long multiple twin shielding wire and mends control desk; Voltage signal transmits, and amplitude has only about 1.2V, is easy to introduce interfering signal.
In sum, existing merit is mended control method and device remains in some shortcomings, therefore necessary this is improved.
Summary of the invention
The objective of the invention is to mend the low deficiency of rating of set factor, a kind of vehicle-mounted power factor compensation control method and device that improves power factor is provided at existing vehicle-mounted merit.To solve the historical problem that the both meritorious benefit device of thousands of cover locomotives can't use, guarantee the raising of locomotive power factor, improve the reliability of locomotive, reduce the energy resource consumption of electrified circuit, improve the electrical network quality.
According to the technology implementation scheme that purpose of the present invention proposed be: a kind of electric locomotive power is mended control method, and it is according to detection of grid voltage and the electric current that flows into locomotive, the line frequency analysis of spectrum of going forward side by side that described electric locomotive power is mended control; Read in meritorious and reactive volt-amperes, and calculate power factor, determine merit to mend the switching of branch road according to power factor and line voltage again with this.Mend branch road thyristor switch polarity of voltage according to merit simultaneously, the switching pulse of decision thyristor; And gather the electric current of branch road, and do spectral analysis, judge whether excess current, will analyze the reason of excess current as excess current, take the corresponding protection measure; Simultaneously, with the relevant informations such as electric current of the mode of operation of power factor compensation device and line voltage, locomotive electric current, each branch road by the communication oral instructions to the locomotive microcomputer telltale, show by telltale.
Merit of the present invention is mended control setup and is made of two 6U board packages.Wherein one is interface board, comprises the processing section of I/O analog signal and number subsignal, mainly finishes the processing of I/O analog signal and number subsignal; Another piece is a control desk, comprises the switching part of merit power calculation part, power factor compensation branch road, and the fault handling part, mainly finishes the switching and the fault handling of reactive volt-amperes calculating, power factor compensation branch road.Wherein, described merit is mended the control employing cygnal series high-performance high-speed CPU of control setup; Filtering detected idle method after merit was mended control setup employing line voltage phase shift 90 degree and power network current product; Merit is mended control setup and is adopted effective value overcurrent or hot overcurrent protection, and the overcurrent protection mode that described merit is mended control setup is the protection target with the current effective value, and the harmonic wave overcurrent is adopted different protection strategies with the first-harmonic overcurrent.Detect branch road first-harmonic overcurrent and excise this branch road immediately; When detecting the harmonic wave overcurrent, then drop into more branch road,, only after all branch roads all drop into, still just need excise during overcurrent to reduce to flow into the harmonic current of overcurrent branch road.And to sporadic overcurrent, recover automatically the back of can delaying time; It is target with the idle of locomotive that described merit is mended control setup, and power factor get final product greater than 0.9, allows more branch road input as far as possible, reduces the harmonic current of each branch road, the increasing filter effect.
Merit of the present invention is mended the technical characterictic that control setup has following several aspects::
1) the merit control core of mending control setup adopts cygnal series high-performance high-speed CPU, for the control and the defencive function of complexity provides hardware foundation; Logic adopts CPLD, has improved arithmetic capability, antijamming capability and the alerting ability of system.
2) filtering detected idle method after merit was mended control setup employing line voltage phase shift 90 degree and power network current product.The use of this technology improves idle accuracy of detection and antijamming capability, and not only speed is fast, and the result be one by the DC quantity behind the filter, need not be to phase-detection; Therefore voltage and current distortion and detection signal interference there is very strong inhibit function.
3) merit is mended the composition that multiple harmonic wave is arranged in the branch current of control setup, and the effective value electric current could reflect the heating power of cond; Adopt effective value overcurrent or hot overcurrent protection, prevent the frequent switching that the over-current protection malfunction work causes, can protect the branch road cond effectively simultaneously.Introducing line voltage when being controlled target with idle is controlled target, allows more branch road devote oneself to work as far as possible; The frequent switching of branch road when avoiding single in the past control principle to cause load variations.
The use of this technology not only can reduce the switching frequency and the frequency of branch road, reduce the harmonic current of branch road, and help improving line voltage, and helping the performance of the locomotive tractive effort, the while has also been played the good restraining effect to the fault of vacuum contactor and electric capacity.
4) the overcurrent protection mode of merit benefit control setup is the protection target with the current effective value, and the harmonic wave overcurrent is adopted different protection strategies with the first-harmonic overcurrent.Detect branch road first-harmonic overcurrent and excise this branch road immediately; When detecting the harmonic wave overcurrent, then drop into more branch road,, only after all branch roads all drop into, still just need excise during overcurrent to reduce to flow into the harmonic current of overcurrent branch road.And to sporadic overcurrent, recover automatically the back of can delaying time.
5) to mend control setup be target with the idle of locomotive to merit, and power factor get final product greater than 0.9, allows more branch road input as far as possible, reduces the harmonic current of each branch road, the increasing filter effect.Locomotive operation is that target is controlled merit benefit branch road with power factor greater than 0.9 when half rating horsepower is above, and the more existing number of times of its switching frequency is few.Branch road switching criterion divides three kinds of situations to consider:. when 1. voltage is lower than 19kV, be that 22kV is a controlled target with the line voltage constant voltage, branch road all drops into successively; 2. during voltage 22kV～29kV, be controlled target with idle, reactive volt-amperes drops into a branch road during greater than 480kvar, all drops into until four branch roads; During less than-100kvar, excise a branch road; When 3. line voltage is higher than 29kV, be controlled target with line voltage less than 29kV: excise whole branch roads successively, be lower than 29kV up to voltage; During complete resection, voltage no longer drops into when being higher than 29kV.
6) branch road of former meritorious benefit control setup hinder for some reason withdraw from after, can not recover automatically.For this reason, merit of the present invention is mended the arbitration functions that increases permanent and transient fault in the control setup, recovers automatically during transient fault.As: the first-harmonic excess current is because the inductance of branch road or capacitor element damage to be caused, is permanent fault, should excise immediately, can not be from recovering; The harmonic wave excess current is a transient fault, and recover automatically the time-delay back.
7) control desk of merit benefit control setup has RS232 and RS485 communication port, can show with microcomputer or hand-held Liquid Crystal Display (LCD) are mended power factor, the electrical network of mode of operation, the locomotive of device to merit by communication port the current distortion etc. of distortion, current distortion, harmonic current and each branch road, be convenient to observe and analyze.
Can send a large amount of heats when 8) merit is mended the device capacitance damage, for preventing to cause after the capacitance damage expansion of accident, on power factor compensation capacitance, increase temperature switch, control system is monitored the temperature of electric capacity, when temperature surpasses permissible value, excise corresponding power factor compensation branch road.
The advantage that merit of the present invention is mended control setup is: the watt loss that can reduce power transmission line and substation's voltage transformer.When the locomotive power factor brought up to 0.90 by 0.82, the watt loss of power transmission line and substation's voltage transformer can reduce 17%.General power transmission line and substation's transformer efficiency loss account for 5～6% of electric railway energy resource consumption.Voltage improves 1～2kV on the motorcycle pantograph.And contact system voltage tends to be steady, otherwise the contact system voltage fluctuation can reach 8～9kV; Cause train starting and helper motor operational difficulties.Can improve the capacity degree of utilization of transmission facility (comprising traction transformer of locomotive), perhaps can its capacity of corresponding minimizing.Bring up to 0.90 when power factor by 0.82, the capacity utilization can improve about 8%.Reduce the harmonic current that locomotive is carried to electrical network, can reduce rotating machine, electrical network, additional loss and the heating of voltage transformer generation, reduce the interference that open-wire line voice-frequency telephony circuit is produced.
Description of drawings
Fig. 1 is a hardware controls schematic diagram of the present invention;
Fig. 2 is a main program flow chart of the present invention.
The specific embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments.
The present invention is that a kind of electric locomotive power is mended control setup, accompanying drawing 1 has provided the embodiment control principle figure that a kind of electric locomotive power is mended mode, from accompanying drawing as can be seen, the control of described electric locomotive power benefit is the electric current according to detection of grid voltage and inflow locomotive, the line frequency analysis of spectrum of going forward side by side; Read in meritorious and reactive volt-amperes, and calculate power factor, determine merit to mend the switching of branch road according to power factor and line voltage again with this.Mend branch road thyristor switch polarity of voltage according to merit simultaneously, the switching pulse of decision thyristor; And gather the electric current of branch road, and do spectral analysis, judge whether excess current, will analyze the reason of excess current as excess current, take the corresponding protection measure; Simultaneously, with the relevant informations such as electric current of the mode of operation of power factor compensation device and line voltage, locomotive electric current, each branch road by the communication oral instructions to the locomotive microcomputer telltale, show by telltale.
Merit of the present invention is mended control setup and is made of two 6U board packages.Wherein one is interface board, comprises the processing section of I/O analog signal and number subsignal, mainly finishes the processing of I/O analog signal and number subsignal; Another piece is a control desk, comprises the switching part of merit power calculation part, power factor compensation branch road, and the fault handling part, mainly finishes the switching and the fault handling of reactive volt-amperes calculating, power factor compensation branch road.Wherein, described merit is mended the control employing cygnal series high-performance high-speed CPU of control setup; Filtering detected idle method after merit was mended control setup employing line voltage phase shift 90 degree and power network current product; Merit is mended control setup and is adopted effective value overcurrent or hot overcurrent protection, and the overcurrent protection mode that described merit is mended control setup is the protection target with the current effective value, and the harmonic wave overcurrent is adopted different protection strategies with the first-harmonic overcurrent.Detect branch road first-harmonic overcurrent and excise this branch road immediately; When detecting the harmonic wave overcurrent, then drop into more branch road,, only after all branch roads all drop into, still just need excise during overcurrent to reduce to flow into the harmonic current of overcurrent branch road.And to sporadic overcurrent, recover automatically the back of can delaying time; It is target with the idle of locomotive that described merit is mended control setup, and power factor get final product greater than 0.9, allows more branch road input as far as possible, reduces the harmonic current of each branch road, the increasing filter effect.Merit of the present invention is mended the technical characterictic that control setup has following several aspects:
1) the merit control core of mending control setup adopts cygnal series high-performance high-speed CPU, for the control and the defencive function of complexity provides hardware foundation; Logic adopts CPLD, has improved arithmetic capability, antijamming capability and the alerting ability of system.
2) filtering detected idle method after merit was mended control setup employing line voltage phase shift 90 degree and power network current product.The use of this technology improves idle accuracy of detection and interference performance, and not only speed is fast, and the result be one by the DC quantity behind the filter, need not be to phase-detection; Therefore voltage and current distortion and detection signal interference there is very strong inhibit function.
3) merit is mended the composition that multiple harmonic wave is arranged in the branch current of control setup, and the effective value electric current could reflect the heating power of cond; Adopt effective value overcurrent or hot overcurrent protection, prevent the frequent switching that the over-current protection malfunction work causes, can protect the branch road cond effectively simultaneously.Introducing line voltage when being controlled target with idle is controlled target, allows more branch road devote oneself to work as far as possible; The frequent switching of branch road when avoiding single in the past control principle to cause load variations.
The use of this technology not only can reduce the switching frequency and the frequency of branch road, reduce the harmonic current of branch road, and help improving line voltage, and helping the performance of the locomotive tractive effort, the while has also been played the good restraining effect to the fault of vacuum contactor and electric capacity.
4) the overcurrent protection mode of merit benefit control setup is the protection target with the current effective value, and the harmonic wave overcurrent is adopted different protected modes with the first-harmonic overcurrent.As detect the first-harmonic overcurrent and excise immediately; When detecting the harmonic wave overcurrent, then drop into more branch road,, only after all branch roads all drop into, still just need excision during overcurrent to reduce to flow into the harmonic current of overcurrent branch road.To sporadic overcurrent, emergency protection is recovered automatically, only permanent excision fault branch when permanent fault takes place.
5) to mend control setup be target with the idle of locomotive to merit, and power factor get final product greater than 0.9, allows more branch road input as far as possible, reduces the harmonic current of each branch road, the increasing filter effect.Can calculate, locomotive is that target is mended branch road control to merit with power factor greater than 0.9 when half rated power operation, and the more existing number of times of its switching frequency is few.Branch road switching criterion divides three kinds of situations to consider: when 1. voltage is lower than 19kV, be that 22kV is a controlled target with the line voltage constant voltage, branch road all drops into successively; 2. during voltage 22kV～29kV, be controlled target with idle, reactive volt-amperes drops into a branch road during greater than 480kvar, all drops into until four branch roads; During less than-100kvar, excise a branch road; When 3. line voltage is higher than 29kV, be controlled target with line voltage less than 29kV: excise whole branch roads successively, be lower than 29kV up to voltage; During complete resection, voltage no longer drops into when being higher than 29kV.
6) branch road of former meritorious benefit control setup hinder for some reason withdraw from after, can not recover automatically.For this reason, merit of the present invention is mended the arbitration functions that increases permanent and transient fault in the control setup, recovers automatically during transient fault.As: the first-harmonic excess current is because the inductance of branch road or capacitor element damage to be caused, is permanent fault, and excision immediately can not be from recovering; The harmonic wave excess current is a transient fault, and recover automatically the time-delay back.
7) the power factor compensation control desk of merit benefit control setup has RS232 and RS485 communication port, can show with microcomputer or hand-held Liquid Crystal Display (LCD) are mended power factor, the electrical network of mode of operation, the locomotive of device to merit by communication port the current distortion etc. of distortion, current distortion, harmonic current and each branch road, be convenient to observe and analyze.
8) merit is mended when the device cond damages and can be sent a large amount of heats, for preventing to cause after cond from damaging the expansion of accident, on cond, increase temperature switch, control system is monitored the temperature of cond, when temperature surpasses permissible value, excise corresponding merit and mend branch road.
The main program flow of merit benefit control setup of the present invention mainly may further comprise the steps as shown in Figure 2:
1, merit is mended control setup and is entered the initial detecting state;
2, the control chip of merit benefit control setup enters the initial detecting state;
3, by control system each sensor is carried out AC sampling, and the inquiry feedback signal;
4, control system will be carried out analyzing and processing according to feedback signals, at first judge whether superhigh pressure of thyristor, and as superpressure, control system will enter the voltage protection subprogram, carry out voltage protection; Do not have superpressure as thyristor, will enter temperature or other fault judgement,, will carry out cond temperature protection subprogram if temperature surpasses.
If 5 temperature do not surpass, will enter and calculate current effective value, P value and Q value, and the analysis of electric current FFT.At first carry out the analysis of current effective value; if reach the protection value of current effective value, will enter the defence program of current effective value, otherwise with the control of access algorithm routine; and the numerical value of institute's computing sent to communication port with the form of parameter, start pulse signal is proceeded cycle checkout simultaneously.
Merit of the present invention is mended the watt loss that control setup can reduce power transmission line and substation's voltage transformer.When the locomotive power factor brought up to 0.90 by 0.82, power transmission line and substation's transformer efficiency loss can reduce 17%.General power transmission line and substation's transformer efficiency loss account for 5～6% of electric railway energy resource consumption.Voltage improves 1～2kV on the motorcycle pantograph.And contact system voltage tends to be steady, otherwise the contact system voltage fluctuation can reach 8～9kV; Cause train starting and helper motor operational difficulties.Can improve the capacity degree of utilization of transmission facility (comprising traction transformer of locomotive), perhaps can its capacity of corresponding minimizing.Bring up to 0.90 when power factor by 0.82, the capacity utilization can improve about 8%.Reduce the harmonic current that locomotive is carried to electrical network, can reduce rotating machine, electrical network, additional loss and the heating of voltage transformer generation, reduce the interference that open-wire line voice-frequency telephony circuit is produced.Novel power factor compensation control setup has the improvement of the following aspects with respect to existing device.
1) merit is mended the improvement of control hardware
Former meritorious benefit control setup is the analog circuitry system that adopts integrated circuit and other breakaway-element to constitute, and has that function is simple, error is big, parameter modification is dumb and many shortcomings such as fault rate height.
The control core of novel power factor compensation control setup adopts cygnal series high-performance high-speed CPU, for the control and the defencive function of complexity provides hardware foundation; Logic adopts CPLD, has improved arithmetic capability, antijamming capability and the alerting ability of system.
2) power factor compensation device overvoltage protection value resets
The setting of the branch line overvoltage of novel power factor compensation control setup protection operating value is consistent with locomotive traction overvoltage protection value or use same overvoltage protection signal, and branch road can not withdraw from (each traction circuit withdraws from simultaneously during overvoltage) because of overvoltage protection separately during locomotive operation like this.
3) the current signal transfer mode improves
The both meritorious branch current signal of mending control setup is after becoming voltage signal by current transformer, passes to the power factor compensation control desk by long multiple twin shielding wire; The employing voltage signal transmits, and amplitude only is about 1.2V, to be easy to introduce interfering signal.
Novel power factor compensation control setup moves to the secondary side sample resistance of branch current transformer on the control desk from transformer, the transmission of filter branch current signal becomes current system by voltage system like this, has improved the antijamming capability in signals transmission.
4) idle and meritorious detection mode is improved
Existing control setup is measured reactive volt-amperes, Q=U according to idle and meritorious defined formula
N1I
N1Cos θ, this scheme will be read the effective value and the phase difference thereof of line voltage and current first harmonics, because line voltage and current distortion are very serious, survey precision is difficult to guarantee, and poor anti jamming capability.
Filtering detected idle method after novel power factor compensation control setup adopted line voltage phase shift 90 degree and power network current product, improved idle accuracy of detection and interference performance.What the merit of 6K locomotive was mended the control setup employing is exactly this method.
5) branch road overcurrent protection mode is improved
Branch road excises branch road with instantaneous peak value overcurrent and two kinds of schemes of aviation value overcurrent on original locomotive behind the overcurrent.Because the current distortion of filter branch is very serious, this dual mode all can not accurately reflect the overload degree of branch road, causes over-current protection malfunction to do.Behind branch road of overcurrent excision, still the harmonic current of the branch road of Tou Ruing can increase, so easier overcurrent and withdrawing from, and causes whole branch roads to withdraw from because of overcurrent.
The overcurrent protection mode of novel power factor compensation control setup is the protection target with the current effective value, simultaneously harmonic wave overcurrent and first-harmonic overcurrent is come respectively, and adopts different protected modes.Should excise immediately during the first-harmonic overcurrent; During the harmonic wave excess current, be very few, should drop into more harmonic wave branch road, reduce to flow into the harmonic current of overcurrent branch road, only after all branch road inputs, still just need excision during overcurrent because drop into branch road.
6) branch road switching scheme is improved
The switching of original branch road is with the idle target that is controlled to be:
As idle Q〉drop into one group of merit during 480kvar and mend branch road, all drop into up to four groups;
When idle Q＜120kvar, excise one group of merit and mend branch road, up to four groups of complete resections;
The more switching frequency of branch road when this mono-compensate control principle may cause load variations, this life-span to the electric elements of filter branch is influential.
Introducing line voltage when the switching of novel power factor compensation control setup is controlled target with idle is controlled target: (as high 25kV) is controlled target with idle when line voltage is higher, when line voltage is low (being lower than 25kV), when being controlled target with idle, introducing line voltage simultaneously is controlled target, allow more branch road devote oneself to work as far as possible, so not only can reduce the switching frequency and the frequency of branch road, reduce the harmonic current of branch road, and help improving line voltage, help the locomotive tractive effort performance (on the electric railway power supply terminal capacitor switching be to be controlled target with the line voltage).
7) increase the failure recovery function
The major cause that former meritorious branch road can not normally move be branch road hinder for some reason withdraw from after, can not recover automatically.Do not having under the situation of being strict with, the driver is unwilling to drop into again.
For this reason, increased permanent in the novel power factor compensation control setup and arbitration functions transient fault, recovered automatically during transient fault.As: the first-harmonic excess current is because the inductance of branch road or capacitor element damage to be caused, is permanent fault, should excise immediately, can not be from recovering; The harmonic wave excess current is a transient fault, and recover automatically the time-delay back.
8) newly-increased power factor compensation device working condition monitors communication port
Novel power factor compensation control setup has RS232 and RS485 communication port, can show the current distortion of the distortion of the power factor of the mode of operation of power factor compensation device, locomotive, electrical network, current distortion, each branch road and harmonic current etc. by communication port with microcomputer or hand-held Liquid Crystal Display (LCD), be convenient to observe and analyze.
9) priority of change branch road switching
Both meritorious each branch road of mending on the device is the same on priority, and the lift uniformity for the electric capacity that guarantees each branch road adopts and drops into the principle of excising earlier earlier.
In fact 1/2 bridge on the locomotive is always open earlier, therefore the harmonic current of its cooresponding traction winding generation always can be more than or equal to the harmonic current of other two 1/4 bridges generations of sky, and impedance is arranged between the traction winding, in order to make branch road that better filter effect be arranged, novel power factor compensation control setup, branch road on the traction winding of 1/2 bridge is preferentially dropped into, at last excision.
10) the temperature monitoring function of reservation power factor compensation device electric capacity
Can send a large amount of heats during capacitance damage, for preventing to cause after the capacitance damage expansion of accident, can on cond, increase temperature switch, novel power factor compensation control setup has been reserved the function that the temperature of electric capacity is monitored, when temperature surpasses permissible value, excise corresponding branch road.
Claims (10)
1, a kind of Power Factor of Electric Locomotive compensating control method is characterized in that: it is according to detection of grid voltage and the electric current that flows into locomotive, the line frequency analysis of spectrum of going forward side by side that described electric locomotive power is mended control; Read in meritorious and reactive volt-amperes, and calculate power factor, determine merit to mend the switching of branch road according to power factor and line voltage again with this; Mend branch road thyristor switch polarity of voltage according to merit simultaneously, the switching pulse of decision thyristor; And gather the electric current of branch road, and do spectral analysis, judge whether excess current, will analyze the reason of excess current as excess current, take the corresponding protection measure; And with the relevant informations such as electric current of the mode of operation of power factor compensation device and line voltage, locomotive electric current, each branch road by the communication oral instructions to the locomotive microcomputer telltale, show by telltale.
2, Power Factor of Electric Locomotive compensating control method as claimed in claim 1 is characterized in that: filtering detected idle method after described merit was mended control setup employing line voltage phase shift 90 degree and power network current product.
3, Power Factor of Electric Locomotive compensating control method as claimed in claim 1 is characterized in that: merit is mended branch road and is adopted effective value overcurrent or hot overcurrent protection, prevents the frequent switching that the over-current protection malfunction work causes.
4, Power Factor of Electric Locomotive compensating control method as claimed in claim 3 is characterized in that: the harmonic wave overcurrent adopts different protected modes with the first-harmonic overcurrent; The first-harmonic overcurrent should excise immediately; During the harmonic wave excess current, then drop into more branch road,, only after all branch roads all drop into, still just need excision during overcurrent to reduce to flow into the harmonic current of overcurrent branch road; To sporadic overcurrent, emergency protection is recovered automatically, only permanent excision fault branch when permanent fault takes place.
5, Power Factor of Electric Locomotive compensating control method as claimed in claim 1 is characterized in that: it is target with the idle control and the line voltage of locomotive that merit is mended control setup, allows more branch road input as far as possible; Branch road switching criterion divides three kinds of situations to consider:. when 1. voltage is lower than 19kV, be that 22kV is a controlled target with the line voltage constant voltage, branch road all drops into successively; 2. during voltage 22kV～29kV, be controlled target with idle, reactive volt-amperes drops into a branch road during greater than 480kvar, all drops into until four branch roads; During less than-100kvar, excise a branch road; When 3. line voltage is higher than 29kV, be controlled target with line voltage less than 29kV: excise whole branch roads successively, when voltage was lower than the 29kV complete resection, voltage no longer dropped into when being higher than 29kvar.
6, a kind of power factor compensation control setup of realizing the described Power Factor of Electric Locomotive compensating control method of claim 1, it is characterized in that: the power factor compensation control setup is finished by two 6U board packages; Wherein one is interface board, comprises the processing section of I/O analog signal and number subsignal; Another piece is a control desk, comprises the switching part of merit power calculation part, power factor compensation branch road, and the fault handling part.
7, power factor compensation control setup as claimed in claim 6 is characterized in that: the control core that merit is mended control setup adopts cygnal series high-performance high-speed CPU; Logic adopts CPLD.
8, power factor compensation control setup as claimed in claim 6 is characterized in that: increase the arbitration functions of permanent and transient fault in the power factor compensation control setup, recover automatically during transient fault, permanent fault is then excised merit immediately and is mended branch road.
9, power factor compensation control setup as claimed in claim 6 is characterized in that: the setting of the branch line overvoltage of power factor compensation control setup protection operating value is consistent with locomotive traction overvoltage protection value or use same overvoltage protection signal; And the power factor compensation control setup adopts RS232 and RS485 communication port.
10, power factor compensation control setup as claimed in claim 6, it is characterized in that: the power factor compensation control setup moves to the secondary side sample resistance of branch current transformer on the control desk from transformer, and the transmission of filter branch current signal is the current system transmission.
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| CN200710035844.XA CN101396970B (en) | 2007-09-30 | 2007-09-30 | Electric locomotive power factor compensation control method and device |
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| CN200710035844.XA CN101396970B (en) | 2007-09-30 | 2007-09-30 | Electric locomotive power factor compensation control method and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105459851A (en) * | 2015-11-24 | 2016-04-06 | 乐山晟嘉电气股份有限公司 | Control method for improving electrical efficiency of electric locomotive |
| CN109249945A (en) * | 2018-08-16 | 2019-01-22 | 中车唐山机车车辆有限公司 | Tractive force of train method of adjustment, device, electronic equipment and storage medium |
| CN109586316A (en) * | 2018-12-04 | 2019-04-05 | 广州番禺职业技术学院 | A kind of factory's Practical power factor compensation method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100394664C (en) * | 2006-06-23 | 2008-06-11 | 北京四方清能电气电子有限公司 | Compensator for electric-railway non-power compensation and electric-energy quality control |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105459851A (en) * | 2015-11-24 | 2016-04-06 | 乐山晟嘉电气股份有限公司 | Control method for improving electrical efficiency of electric locomotive |
| CN105459851B (en) * | 2015-11-24 | 2018-03-27 | 乐山晟嘉电气股份有限公司 | A kind of control method for improving electric locomotive electrical efficiency |
| CN109249945A (en) * | 2018-08-16 | 2019-01-22 | 中车唐山机车车辆有限公司 | Tractive force of train method of adjustment, device, electronic equipment and storage medium |
| CN109586316A (en) * | 2018-12-04 | 2019-04-05 | 广州番禺职业技术学院 | A kind of factory's Practical power factor compensation method |
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