CN104901305A - Traction power supply network tail end voltage boosting device with power fusing function and method of device - Google Patents
Traction power supply network tail end voltage boosting device with power fusing function and method of device Download PDFInfo
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to a traction power supply network tail end voltage boosting device with a power fusing function and a method of the device. The device includes a multiple voltage reduction module and a power-fusing current-converting module; the multiple voltage reduction module is connected into two power supply arm power sources of the tail end of a traction power supply network and includes two single-phase multi-winding transformers of the same structure which are correspondingly connected into the two power supply arm power sources respectively through connection switches; the power-fusing current-converting module is used for performing energy conversion on the two power supply arm power sources and includes a plurality of current conversion sub modules; one set of voltage is connected into two input sides of each current conversion sub module through corresponding secondary windings of the two single-phase multi-winding transformers, so that energy conversion can be performed; and through controlling the switch-on of the current conversion sub modules, output voltage can be boosted, and power fusion of the two power supply arms can be performed. According to the method of the invention, the voltage of the tail end of the traction power supply network can be stabilized and boosted through controlling the power-fusing current-converting module. The device and the method of the invention have the advantages of simple structure, low cost, power fusion and train power network resonance suppression, and can boost the voltage of the tail end of the traction power supply network.
Description
Technical field
The present invention relates to Traction networks network voltage at tail end electric energy Treatment process field, particularly relate to a kind of traction power supply network voltage at tail end lifting device and the method thereof with power circulation function.
Background technology
In recent years, along with growing with each passing day of China's electric railway rate of traffic flow and bicycle power, the long supply arm Voltage Drop of Traction networks is serious, has had influence on the normal operation of electric locomotive, also limit the further lifting of freight volume.The net being directed to traction power supply end presses through low problem, mainly contains following several settling mode at present:
1) employing sets up transformer station's mode, as Datong-Qinhuangdao Railway Yanqing Traction networks; But such mode is invested greatly, and required cost is high;
2) compensator with series capaci tance is adopted to improve the mode of Traction networks network voltage at tail end, such as logical (peace post) Tang (family fort) Traction networks in precious (chicken)-Lan (state) two wires; Such mode due to string benefit capacity little, thus its actual lifting poor effect;
3) adopt the mode regulating transformer tapping to improve transformer line voltage, due to the operation characteristic of locomotive own and compensation arrangement limitation, such mode is also very limited to the improvement result of supply arm network voltage at tail end;
4) mode of FC device or TSC device is installed additional at traction power supply end, such as Chinese patent application CN102222916A discloses a kind of electrified railway power supply arm network voltage at tail end and improves devices and methods therefor, by the end installing FC device at traction substation supply arm, realize the dynamic compensation on the spot to reactive load electric current, thus improve line network pressure; Chinese patent application CN101882788A discloses a kind of supply voltage at tail end of long supply arm of heavy haul railway and improves mode and device, by the autotransformer end of the end at long supply arm, buck many groups TSC is housed, improves network voltage at tail end.
From the foregoing, the mode installing FC device or TSC device at traction power supply end additional only can realize single net pressure enhanced feature, and the simple capacitive reactive power relying on FC or TSC to provide has significant limitation to improve voltage, sending capacitive reactive power electric substation will be caused to measure to tractive power supply system examines the power factor of side on the low side for a long time, fine is serious, simultaneously because tractive power supply system net voltage fluctuation is frequent; And if wherein take FC device, can not according to net pressure dynamic adjustments capacitive reactive power, trailer system net pressure also can fluctuate frequently, is unfavorable for safe driving; According to TSC device, device frequent switching will be caused, be unfavorable for the safe and stable operation of equipment.
In sum, traction power supply network voltage at tail end hoisting way of the prior art, promotes limited efficiency on the one hand and cost is higher, can not realize high performance net pressure enhanced feature; On the other hand, owing to only can press lifting device as single net, the power quality problem of end of cannot powering in conjunction with power quality controlling solution Traction networks, function singleness, cost performance are not high, and there is the safety high of electrical network.Therefore, provide one to be applicable to China's Electrified Railways electric power system, make its small investment, the required cycle is short and improving performance good, can solve the traction power supply network voltage at tail end lifting device of power quality controlling problem, be extremely urgent problem simultaneously.
Summary of the invention
The technical problem to be solved in the present invention is just: the technical problem existed for prior art, the invention provides that a kind of structure is simple, cost is low and widely used traction power supply network voltage at tail end lifting device and the method thereof with power circulation function, can effectively promote traction power supply network voltage at tail end and burning voltage fluctuation, there is the function of power circulation, suppression car net resonance etc. simultaneously.
For solving the problems of the technologies described above, the technical scheme that the present invention proposes is:
There is a traction power supply network voltage at tail end lifting device for power circulation function, comprising:
Multiplex voltage reduction module, to power end two supply arm power supply carry out step-down for accessing Traction networks, comprise the single-phase multi winding transformer that two structures are identical, two described single-phase multi winding transformers access two supply arm power supplys, the many groups α arm voltage after corresponding output buck, β arm voltage by connecting valve is corresponding respectively;
Power circulation unsteady flow module, for carrying out energy conversion respectively to two supply arm power supplys of access, comprise multiple unsteady flow submodule, two input sides of each described unsteady flow submodule access one group of α arm voltage through the corresponding vice-side winding of two described single-phase multi winding transformers respectively, β arm voltage carries out energy conversion, promote output voltage and carry out the power circulation of two supply arms by the conducting controlling each unsteady flow submodule.
Further improvement as this device: described unsteady flow submodule comprises two the soft charging circuits being separately positioned on two input sides and the power cell be connected between two described soft charging circuits, described power cell comprises the H bridge converter circuit of two same structures, each described H bridge converter circuit connects the vice-side winding of a single-phase multi winding transformer respectively by described soft charging circuit correspondence, each described H bridge converter circuit includes four full-controlled switch components and parts, the output voltage of described power cell is controlled by the conducting controlling each full-controlled switch components and parts.
Further improvement as this device: described power circulation unsteady flow module adopts prepackage type current transformer.
Further improvement as this device: also comprise two are divided capacitive reactive power high pass filter for filtering high order harmonic component and providing unit, two described high pass filters access Traction networks respectively by connecting valve and to power two supply arms of end.
Further improvement as this device: described high pass filter is installed on section post or the switching station of Traction networks end.
The present invention also provides a kind of method according to above-mentioned traction power supply network voltage at tail end lifting device, the method specifically comprises: detect the network voltage at tail end of two supply arms respectively and judge, if be within the scope of default maximum web pressure value and minimum net pressure value, then control unsteady flow submodule described in each and be failure to actuate; Otherwise enable net pressure promotes and stable mode, if the network voltage at tail end that wherein there is more than one supply arm is greater than default maximum web pressure value, then the conducting by controlling unsteady flow submodule described in each exports lagging reactive power, stablizes the network voltage at tail end of corresponding supply arm; If the network voltage at tail end that there is more than one supply arm is less than default minimum net pressure value, then the conducting by controlling unsteady flow submodule described in each exports capacitive reactive power, promotes the network voltage at tail end of corresponding supply arm.
As the further improvement of the inventive method, also comprise active power circulation step, concrete steps comprise:
Detect outlet current signal and the net pressure signal of two supply arms respectively, and calculate corresponding active power;
Judge the difference size of the active power between two supply arms, if be less than default minimum active power value, then control unsteady flow submodule described in each and be failure to actuate; Otherwise enable active power mergence model, if be wherein greater than default maximum active power value, then by controlling the conducting of unsteady flow submodule described in each, by side lower for active power in two supply arms to the higher side of active power according to full capacity transmitting active power; If be in default maximum power value and minimal power values, then by controlling the conducting of unsteady flow submodule described in each, the designated ratio size transmitting active power by side lower for active power in two supply arms to the higher side of active power according to the difference of described active power.
As the further improvement of the inventive method, also comprise active power circulation step, concrete steps comprise: the difference size judging the network voltage at tail end value between two supply arms, if be less than default minimum net pressure value, then control unsteady flow submodule described in each and are failure to actuate; Otherwise enable active power mergence model, if be wherein greater than default maximum web pressure value, by controlling the conducting of unsteady flow submodule described in each, by side higher for a lateral end net pressure lower for network voltage at tail end in two supply arms according to full capacity transmitting active power; If be within the scope of default maximum web pressure value and minimum net pressure value, by controlling the conducting of unsteady flow submodule described in each, by side lower for active power in two supply arms to the higher side of active power according to described go out the designated ratio transmitting active power of difference of gauze pressure value.
As the further improvement of the inventive method, also comprise reactive power compensation step, concrete steps comprise: if the network voltage at tail end of two supply arms is all greater than default minimum net pressure value, compensate the reactive power of two supply arms with bring to power factor by the conducting controlling power circulation unsteady flow module described in each.
Further improvement as the inventive method: also comprise and suppress car net resonant step, concrete steps comprise: the network voltage at tail end signal and the end current signal that detect two supply arms, and go out each harmonic content according to the signal decomposition detected, the full-controlled switch components and parts controlling unsteady flow submodule described in each carry out HF switch, export for offsetting the harmonic current of described each harmonic content that detects and obtain to suppress car net resonance.
Compared with prior art, the invention has the advantages that:
1) the present invention accesses two supply arm power supplys respectively by two single-phase multi winding transformers and carries out multiplex step-down, voltage after step-down carries out energy conversion respectively from two input access power circulation unsteady flow modules, lifting and the burning voltage fluctuation of output voltage can be realized by the conducting controlling each unsteady flow submodule, suppress car net low-order harmonic, each power circulation unsteady flow module is connected across between end two supply arm by single-phase multi winding transformer simultaneously, thus the active power circulation between two supply arms can be realized, improve the whole volume utilance of tractive power supply system,
2) the present invention utilizes the high impedance of multiplex transformer to substitute traditional linked reactor, can connect the output voltage that line voltage and power circulate converter module, thus meet the condition of flow of power, also can suppress ripple current simultaneously;
3) the present invention comprises two high pass filters further, by access two high pass filters can realize to Traction networks alternating current electric locomotive produce high order harmonic component filtering and change line impedance, realize suppressing car net resonance function, and due to filter be capacitive, lift portion network voltage at tail end that can be suitable, improves the enhanced feature of network voltage at tail end further;
4) power circulation unsteady flow module of the present invention adopts prepackage type current transformer to form the complete sets of equipment, each unsteady flow submodule is a heavy power cabinet, all power cabinets and control cubicle are placed on internal container, be convenient to adopt epidemic disaster automatic regulating system at internal container, thus easy for installation, effectively shorten the required site operation cycle, and automatically controlled by humiture, enhance the adaptability of environment, make to be widely used in high temperature, the adverse circumstances such as high and cold; Simultaneously often heavy power cabinet becomes cabinet separately, and each often parallel running and being independent of each other between heavy power cabinet, is convenient to realize capacity extension;
5) power circulation unsteady flow module of the present invention adopts container-like structure, can be loaded in section post, can be realized on the spot or remote monitoring by master-slave control mode, thus realize on duty without the need to people;
6) the present invention can promote the power supply capacity of Traction networks without the need to changing main transformer in electric substation, effectively realize lifting and the voltage stabilization of traction power supply network voltage at tail end, take into account meritorious circulation, reactive power compensation simultaneously further and suppress the several functions such as car net resonance, realizing power quality harnessed synthetically.
Accompanying drawing explanation
Fig. 1 is the main circuit structure schematic diagram that the present embodiment has the traction power supply network voltage at tail end lifting device of power circulation function.
Fig. 2 is the control principle schematic diagram of power circulation unsteady flow module in the present embodiment.
Fig. 3 be in the present embodiment promote and stable network voltage at tail end pattern realize principle schematic.
Fig. 4 be in the present embodiment the first active power mergence model realize principle schematic.
Fig. 5 be in the present embodiment the second active power mergence model realize principle schematic.
Fig. 6 be in the present embodiment reactive power compensation pattern realize principle schematic.
Fig. 7 be suppress car net mode of resonance in the present embodiment realize principle schematic.
Embodiment
Below in conjunction with Figure of description and concrete preferred embodiment, the invention will be further described, but protection range not thereby limiting the invention.
As shown in Figure 1, the present embodiment has the traction power supply network voltage at tail end lifting device of power circulation function, comprising:
Multiplex voltage reduction module, to power end two supply arm power supply carry out step-down for accessing Traction networks, comprise the single-phase multi winding transformer that two structures are identical, two single-phase multi winding transformers access two supply arm power supplys, the many groups α arm voltage after corresponding output buck, β arm voltage by connecting valve is corresponding respectively;
Power circulation unsteady flow module, for carrying out energy conversion respectively to two supply arm power supplys of access, comprise multiple unsteady flow submodule, two input sides of each unsteady flow submodule access one group of α arm voltage through the corresponding vice-side winding of two single-phase multi winding transformers respectively, β arm voltage carries out energy conversion, promote output voltage and carry out the power circulation of two supply arms by the conducting controlling each unsteady flow submodule.
The present embodiment accesses two supply arm power supplys respectively by two single-phase multi winding transformers and carries out multiplex step-down, many groups α arm voltage after step-down, β arm voltage access each unsteady flow submodule from two inputs respectively and carry out energy conversion, the lifting of output voltage can be realized by the conducting controlling each unsteady flow submodule and stablize, the unsteady flow of power circulation simultaneously module is connected across between end two supply arm by single-phase multi winding transformer, thus can realize the active power circulation between two supply arms, improve the whole volume utilance of tractive power supply system.The traction power supply network voltage at tail end lifting device that the present embodiment has power circulation function directly mounts 27.5kV feeder line, is applicable to V/v, the various electric railway transformer such as V/X, SCOTT.
See Fig. 1, the present embodiment is by single-phase multi winding transformer T1, single-phase multi winding transformer T2 is respectively by connecting valve QF1, QF2 is connected to the α of Traction networks end, β two supply arm, by connecting valve QF1, QF2 can realize trip protection during fault, two supply arm power supplys of access are provided to power circulation unsteady flow module, wherein single-phase multi winding transformer can adopt the single-phase multi winding transformer of high impedance, specifically comprise n vice-side winding, power circulation unsteady flow module correspondence arranges n unsteady flow submodule U1 ~ Un, the concrete value of n can be chosen according to the capacity of desired volume and power circulation unsteady flow module.The present embodiment utilizes the high impedance of multiplex transformer to substitute traditional linked reactor, can connect the output voltage that line voltage and power circulate inverter in converter module, thus meet the condition of flow of power, also can suppress ripple current simultaneously.
In the present embodiment, unsteady flow submodule comprises two the soft charging circuits being separately positioned on two input sides and the power cell be connected between two soft charging circuits, power cell comprises the H bridge converter circuit of two same structures, each H bridge converter circuit connects the vice-side winding of a single-phase multi winding transformer respectively by soft charging circuit correspondence, each H bridge converter circuit includes four full-controlled switch components and parts, the output voltage of power cell is controlled by the conducting controlling each full-controlled switch components and parts, thus realize the reactive power compensation of two supply arms, active power circulation and harmonic wave control.
As shown in Figure 1, power cell specifically adopts four-quadrant power cell back-to-back, comprise the H bridge converter circuit on the H bridge converter circuit in the left side connected successively, DC capacitor (C1 ~ Cn) and right side, wherein the H bridge converter in left side connects a vice-side winding of single-phase multi winding transformer T1 by the first soft charging circuit correspondence, the first charging paths that the first soft charging circuit comprises by-pass switch KM3n and is made up of the charging contactor KM1n, the charging resistor R11 that are connected in series; The H bridge converter on right side connects a vice-side winding of single-phase multi winding transformer T2, the second charging paths that the second soft charging circuit comprises by-pass switch KM4n and is made up of the charging contactor KM2n, the charging resistor R21 that are connected in series by the second soft charging circuit correspondence.
In the present embodiment, power circulation unsteady flow module adopts prepackage type current transformer to form the complete sets of equipment, each unsteady flow submodule is a heavy power cabinet, all power cabinets and control cubicle are placed on internal container, are convenient to adopt epidemic disaster automatic regulating system at internal container, thus easy for installation, effectively shorten the required site operation cycle, and automatically controlled by humiture, enhance the adaptability of environment, make to be widely used in high temperature, the adverse circumstances such as high and cold; Simultaneously often heavy power cabinet becomes cabinet separately, and each often parallel running and being independent of each other between heavy power cabinet, is convenient to realize capacity extension.
In the present embodiment, also comprise two are divided capacitive reactive power high pass filter for filtering high order harmonic component and providing unit, two high pass filters access Traction networks respectively by connecting valve and to power two supply arms of end.As shown in Figure 1, the high pass filter in left side accesses α supply arm by connecting valve QF3, comprises filtering capacitor C1 and the filter reactor L1 be connected in parallel, noninductive resistor R1; The high pass filter on right side accesses β supply arm by connecting valve QF4, comprises filtering capacitor C2 and the filter reactor L2 be connected in parallel, noninductive resistor R2.By to filtering capacitor C1, C2, the setting of filter reactor L1, L2 and noninductive resistor R1, R2, can realize the filtering of more than 13 times high order harmonic components and change line impedance.
The present embodiment arranges voltage transformer pt 1, the PT2 for gathering network voltage at tail end signal at two supply arm ends respectively, arranges voltage transformer pt 3 for gathering out gauze pressure signal, PT4 and current transformer TA01, TA02 for gathering outlet current signal respectively at the leading-out terminal of two supply arms.
Before said apparatus runs, first closed connecting valve QF1, QF2 access α supply arm, β supply arm power supply carry out soft charging process, two soft charging circuits close charging contactor KM1n, KM2n, through charging resistor R1n, R2n, the DC capacitor in each power cell is charged, to be charged when being full of, closes bypass switch KM3n, KM4n, complete soft charging process, device possesses service conditions.
When said apparatus runs, gather the terminal voltage signal (being collected by voltage transformer pt 1, PT2) of Traction networks two supply arm nearby, by controlling the full-controlled switch break-over of device regulation output voltage in the power cell of each unsteady flow submodule, reaching and promote and stablize the effect of netting pressure and compensation harmonic; Simultaneously by gathering outlet voltage, the current signal of electric substation two supply arm, the reactive power compensation of control realization two supply arm and active power circulation, improve the capacity utilization that Traction networks is overall.When closed connecting valve QF3, QF4 access two high pass filters, also can realize the filtering to the high order harmonic component that Traction networks alternating current electric locomotive is produced, and due to filter be capacitive, lift portion network voltage at tail end that thus can be suitable, improves further the enhanced feature of network voltage at tail end.
In the present embodiment, above-mentioned traction power supply network voltage at tail end lifting device also comprises the control system of power circulation unsteady flow module, is controlled (as IGBT, IGCT, IGET etc.) conducting of full-controlled switch components and parts and the shutoff of power cell in each unsteady flow submodule by control system.As shown in Figure 2, head end current signal and network voltage at tail end signal is gathered by master controller in the present embodiment, by analysis, the controller work controlling each power cabinet is calculated, each power cabinet controller, according to master controller instruction, controls the conducting of full-controlled switch components and parts or the shutoff of each power cell further; Simultaneously master controller gathers the voltage of the switch state signal of each full-controlled switch components and parts and inside, current signal carries out closed loop feedback control.Master controller also by RS485, Ethernet or CAN etc. and host computer and background monitoring communication, be embodied as covering device on the spot or remote monitoring.
The present embodiment also comprises the method for above-mentioned traction power supply network voltage at tail end lifting device, realize promoting and stable network voltage at tail end pattern, the method specifically comprises: detect the network voltage at tail end of two supply arms respectively and judge, if be all within the scope of default normal net pressure, then control each unsteady flow submodule and be failure to actuate; Otherwise enable net pressure promotes and stable mode, if the network voltage at tail end that wherein there is more than one supply arm is greater than default maximum web pressure value, then the conducting by controlling each unsteady flow submodule exports lagging reactive power, stablizes the network voltage at tail end of corresponding supply arm; If the network voltage at tail end that there is more than one supply arm is less than default minimum net pressure value, then the conducting by controlling each unsteady flow submodule exports capacitive reactive power, promotes the network voltage at tail end of corresponding supply arm.
As shown in Figure 3, the present embodiment detects supply arm network voltage at tail end signal (being obtained by voltage transformer pt 1, PT2) U1, U2 especially by control system, the network voltage at tail end voltage U 1 of two supply arms, U2 are compared with preset value Uset respectively after PLL phase lock control, when U1, U2 are all in normal net pressure scope, i.e. Umin≤U1≤Umax, and Umin≤U2≤Umax, wherein Umin is default minimum net pressure value, Umax is default maximum web pressure value, controls each unsteady flow submodule and is failure to actuate; Otherwise enable net pressure promotes and stable mode, when U1 or U2 is greater than Umax, each unsteady flow submodule that control system controls corresponding supply arm by PWM exports perceptual idle, and can offset the capacitive reactive power that high pass filter produces when access high pass filter, stable net is pressed; When terminal voltage U1 or U2 of two supply arms is less than Umin, each unsteady flow submodule that control system controls corresponding supply arm by PWM exports capacitive reactive power, promotes the network voltage at tail end of corresponding supply arm.
In the present embodiment, also comprise active power circulation, reactive power compensation, suppression car net mode of resonance step, active power mergence model, reactive power compensation pattern can be realized and suppress the several functions patterns such as car net mode of resonance.Specifically can according to the priority conditions preset, to promote and to stablize traction power supply network voltage at tail end for target, by each functional mode of control system control realization.
The concrete control strategy of each control model is as follows:
A, active power mergence model
The present embodiment active power mergence model can carry out enable using the active power of two supply arms, network voltage at tail end as criterion respectively.
A) with the active power of two supply arms for criterion
In the present embodiment, the first active power circulation step specifically comprises: the outlet current signal and the net pressure signal that detect two supply arms respectively, and calculates corresponding active power; Judge the difference size of the active power between two supply arms, if be less than default minimum active power value, then control each unsteady flow submodule and be failure to actuate; Otherwise enable active power mergence model, if be wherein greater than default maximum active power value, then by controlling the conducting of each unsteady flow submodule, by side lower for active power in two supply arms to the higher side of active power according to full capacity transmitting active power; If when being within the scope of default maximum power value and minimal power values, then by controlling the conducting of each unsteady flow submodule, the designated ratio size transmitting active power by side lower for active power in two supply arms to the higher side of active power according to the difference of active power.
The present embodiment detects two supply arm outlet current signal I1, I2(especially by control system and is obtained by current transformer TA01, TA02) and net pressure signal U3, U4(by voltage transformer pt 3, PT4 acquisition), calculate active-power P corresponding to two supply arms 1, P2, according to active power mergence model enable between active-power P 1, P2.Namely active power mergence model shifts gains merit for power frequency, as shown in Figure 4, two supply arm outlet current signal I1, I2 through LPF low pass filter filtering high order signal for quick calculating, and net pressure signal U3, U4 carry out power calculation after PLL phase lock control, obtain two corresponding supply arm active power respectively and compare, as │ P1-P2 │≤Pmin, active power circulation is failure to actuate; Otherwise enable active power mergence model, as │ P1-P2 │ >=Pmax, wherein Pmax is default maximum power value, and full capacity transmitting active power is pressed to the side that active power is higher in the side lower by active power in α arm, β arm; As Pmin < │ P1-P2 │ < Pmax, by active power side low in α arm, β arm to high active power side designated ratio size (the present embodiment the gets 50%) transmitting active power by active power difference.
B) with two-arm network voltage at tail end signal U1, U2 for criterion
In the present embodiment, the second active power circulation step comprises: the difference size judging the network voltage at tail end value between two supply arms, if be less than default minimum net pressure value, then control each unsteady flow submodule and be failure to actuate; Otherwise enable active power mergence model, if be wherein greater than default maximum web pressure value, by controlling the conducting of each unsteady flow submodule, by side higher for a lateral end net pressure lower for network voltage at tail end in two supply arms according to full capacity transmitting active power; If be within the scope of default maximum web pressure value and minimum net pressure value, by controlling the conducting of each unsteady flow submodule, by side lower for active power in two supply arms to the higher side of active power according to described go out the designated ratio transmitting active power of difference of gauze pressure value.
Network voltage at tail end value (taking from PT1, PT2) U1, U2 of the present embodiment concrete direct-detection two supply arm, according to the enable active power mergence model of the difference of network voltage at tail end value U1, U2.As shown in Figure 5, network voltage at tail end U1, U2 of two supply arms compare with preset value Uset after PLL phase lock control, and as │ U1-U2 │≤Umin, wherein Umin is default minimum net pressure value, and active power circulation is failure to actuate; Otherwise enable active power mergence model, as │ U1-U2 │ >=Umax, wherein Umax is default maximum web pressure value, and full capacity transmitting active power is pressed to the side that active power is higher in the side lower by active power in α arm, β arm; As Pmin < │ U1-U2 │ < Umax, designated ratio size (the present embodiment the gets 50%) transmitting active power by the lower side of active power in α arm, β arm to the higher side of active power by net pressure difference.
B, reactive power compensation pattern
In the present embodiment, reactive compensation power step specifically comprises: if the network voltage at tail end of two supply arms is all greater than default minimum net pressure value, compensates the reactive power of two supply arms with bring to power factor by the conducting controlling power circulation unsteady flow module described in each.
The present embodiment detects two supply arms network voltage at tail end value U1, U2(especially by control system are obtained by voltage transformer pt 1, PT2), supply arm outlet current signal I1, I2(are obtained by current transformer TA01, TA02), and net pressure signal (being obtained by voltage transformer pt 3, PT4) U3, U4, according to the enable reactive compensation power pattern of network voltage at tail end value U1, U2.As shown in Figure 6, network voltage at tail end U1, U2 of α arm, β arm are respectively through rated output factor after PLL phase lock control, when network voltage at tail end U1, U2 are all greater than default minimum net pressure value Umin, enable reactive power compensation pattern, the each arm reactive power of auto-compensation, is promoted to preset range (the present embodiment get 0.9 and more than) by power factor.
C, suppression car net mode of resonance
In the present embodiment, suppress car net resonant step to comprise: the network voltage at tail end signal and the end current signal that detect two supply arms, and go out each harmonic content according to the signal decomposition detected, each harmonic signal that output detections obtains; Control each unsteady flow submodule and carry out more than 2kHZ HF switch, export and to detect in each harmonic signal of obtaining low-order harmonic electric current to suppress car net resonance for offsetting.
The present embodiment detects network voltage at tail end signal (being obtained by voltage transformer pt 1, PT2) U1, U2 of two supply arms especially by control system, and two supply arm outlet current signal I1, I2(by current transformer TA01, TA02 obtain), decomposite each harmonic content.Suppress the power frequency component that car net mode of resonance and filtering detect, as shown in Figure 7, outlet current signal I1, I2 of α arm, β arm respectively through HPF high pass filter filtering low order signal for quick calculating, harmonic current parsing is carried out after filtering, enable suppression car net mode of resonance, HF switch is carried out by the full-controlled switch components and parts controlling power cell, to export within 13 times and the harmonic current contrary with the harmonic wave equal and opposite in direction detected, direction, with 13 times that detect within each harmonic cancellation of low order; Simultaneously can more than the 13 times high order harmonic components of filtering nearby by high pass filter, reach further and suppress car net resonance effect.
The present embodiment can by setting up to promote and to stablize traction power supply network voltage at tail end for target, it is the Controlling model of constraint with meritorious circulation, reactive power compensation, harmonic wave control etc. simultaneously, each pattern adopts above-mentioned control strategy, make it possible to the lifting and the voltage stabilization that effectively realize traction power supply network voltage at tail end, take into account meritorious circulation, reactive power compensation simultaneously further and suppress the several functions such as car net resonance, realizing the comprehensive regulation of the electrified railway power supply quality of power supply.
Above-mentioned just preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Therefore, every content not departing from technical solution of the present invention, according to the technology of the present invention essence to any simple modification made for any of the above embodiments, equivalent variations and modification, all should drop in the scope of technical solution of the present invention protection.
Claims (10)
1. there is a traction power supply network voltage at tail end lifting device for power circulation function, it is characterized in that, comprising:
Multiplex voltage reduction module, to power end two supply arm power supply carry out step-down for accessing Traction networks, comprise the single-phase multi winding transformer that two structures are identical, two described single-phase multi winding transformers access two supply arm power supplys, the many groups α arm voltage after corresponding output buck, β arm voltage by connecting valve is corresponding respectively;
Power circulation unsteady flow module, for carrying out energy conversion respectively to two supply arm power supplys of access, comprise multiple unsteady flow submodule, two input sides of each described unsteady flow submodule access one group of α arm voltage through the corresponding vice-side winding of two described single-phase multi winding transformers respectively, β arm voltage carries out energy conversion, promote output voltage and carry out the power circulation of two supply arms by the conducting controlling each unsteady flow submodule.
2. traction power supply network voltage at tail end lifting device according to claim 1, it is characterized in that: described unsteady flow submodule comprises two the soft charging circuits being separately positioned on two input sides and the power cell be connected between two described soft charging circuits, described power cell comprises the H bridge converter circuit of two same structures, each described H bridge converter circuit connects the vice-side winding of a single-phase multi winding transformer respectively by described soft charging circuit correspondence, each described H bridge converter circuit includes four full-controlled switch components and parts, the output voltage of described power cell is controlled by the conducting controlling each full-controlled switch components and parts.
3. traction power supply network voltage at tail end lifting device according to claim 2, is characterized in that: described power circulation unsteady flow module adopts prepackage type current transformer.
4. the traction power supply network voltage at tail end lifting device according to claim 1 or 2 or 3, it is characterized in that: also comprise two are divided capacitive reactive power high pass filter for filtering high order harmonic component and providing unit, two described high pass filters access Traction networks respectively by connecting valve and to power two supply arms of end.
5. traction power supply network voltage at tail end lifting device according to claim 4, is characterized in that: described high pass filter is installed on section post or the switching station of Traction networks end.
6. according to the method for the traction power supply network voltage at tail end lifting device in Claims 1 to 5 described in any one, it is characterized in that, the method specifically comprises: detect the network voltage at tail end of two supply arms respectively and judge, if be within the scope of default maximum web pressure value and minimum net pressure value, then control unsteady flow submodule described in each and be failure to actuate; Otherwise enable net pressure promotes and stable mode, if the network voltage at tail end that wherein there is more than one supply arm is greater than default maximum web pressure value, then the conducting by controlling unsteady flow submodule described in each exports lagging reactive power, stablizes the network voltage at tail end of corresponding supply arm; If the network voltage at tail end that there is more than one supply arm is less than default minimum net pressure value, then the conducting by controlling unsteady flow submodule described in each exports capacitive reactive power, promotes the network voltage at tail end of corresponding supply arm.
7. method according to claim 6, is characterized in that: also comprise active power circulation step, concrete steps comprise:
Detect outlet current signal and the net pressure signal of two supply arms respectively, and calculate corresponding active power;
Judge the difference size of the active power between two supply arms, if be less than default minimum active power value, then control unsteady flow submodule described in each and be failure to actuate; Otherwise enable active power mergence model, if be wherein greater than default maximum active power value, then by controlling the conducting of unsteady flow submodule described in each, by side lower for active power in two supply arms to the higher side of active power according to full capacity transmitting active power; If be in default maximum power value and minimal power values, then by controlling the conducting of unsteady flow submodule described in each, the designated ratio size transmitting active power by side lower for active power in two supply arms to the higher side of active power according to the difference of described active power.
8. method according to claim 6, it is characterized in that: also comprise active power circulation step, concrete steps comprise: the difference size judging the network voltage at tail end value between two supply arms, if be less than default minimum net pressure value, then control unsteady flow submodule described in each and are failure to actuate; Otherwise enable active power mergence model, if be wherein greater than default maximum web pressure value, by controlling the conducting of unsteady flow submodule described in each, by side higher for a lateral end net pressure lower for network voltage at tail end in two supply arms according to full capacity transmitting active power; If be within the scope of default maximum web pressure value and minimum net pressure value, by controlling the conducting of unsteady flow submodule described in each, by side lower for active power in two supply arms to the higher side of active power according to described go out the designated ratio transmitting active power of difference of gauze pressure value.
9. the method according to claim 7 or 8, it is characterized in that: also comprise reactive power compensation step, concrete steps comprise: if the network voltage at tail end of two supply arms is all greater than default minimum net pressure value, compensate the reactive power of two supply arms with bring to power factor by the conducting controlling power circulation unsteady flow module described in each.
10. method according to claim 9, it is characterized in that, also comprise and suppress car net resonant step, concrete steps comprise: the network voltage at tail end signal and the end current signal that detect two supply arms, and go out each harmonic content according to the signal decomposition detected, the full-controlled switch components and parts controlling unsteady flow submodule described in each carry out HF switch, export for offsetting the harmonic current of described each harmonic content that detects and obtain to suppress car net resonance.
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