CN106240405B - Single phase power supply device, electric railway traction power supply system and its control method - Google Patents

Single phase power supply device, electric railway traction power supply system and its control method Download PDF

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Publication number
CN106240405B
CN106240405B CN201610727188.9A CN201610727188A CN106240405B CN 106240405 B CN106240405 B CN 106240405B CN 201610727188 A CN201610727188 A CN 201610727188A CN 106240405 B CN106240405 B CN 106240405B
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power supply
phase
conversion unit
voltage
power conversion
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CN106240405A (en
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姜新宇
石磊
许贤昶
吴胜兵
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GUANGZHOU ZHIGUANG ELECTRIC CO Ltd
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GUANGZHOU ZHIGUANG ELECTRIC CO Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60MPOWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
    • B60M3/00Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/02Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
    • H02M5/04Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
    • H02M5/10Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
    • H02M5/14Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion between circuits of different phase number

Abstract

The invention discloses single phase power supply device and its novel electric railway traction power supply systems, control method, power supply system includes power supply isochronous controller, several single phase power supply devices, several section interconnection switches, single phase power supply device includes more vice-side winding transformers, several power conversion unit bodies and master controller, power supply isochronous controller is responsible for the virtual value of Traction networks whole network voltage, frequency is consistent with phase, single phase power supply device realizes that three phase mains is converted into synchronous single phase poaer supply according to synchronic command, it is unified whole that section interconnection switch, which connects each power supply section,.The present invention efficiently solves traditional tractive power supply system power quality problem caused by public electric wire net, provides controllable, reliable, continuous power supply for electric locomotive, while providing ice-melt function, has ensured the safe and reliable of tractive power supply system.

Description

Single phase power supply device, electric railway traction power supply system and its control method
Technical field
The present invention relates to a kind of single phase power supply device, electric railway traction power supply system and its control methods, belong to electricity Power electronics Semiconductor Converting Technology and electric railway traction power supply technique field.
Background technique
Under the epoch that high-speed rail develops on a large scale outside Now Domestic, electric railway provides by force for the high speed development of national economy Strong supporting role is growing however as the scale of electric railway, also increasingly bright to " pollution " of public electric wire net It is aobvious, it is mainly reflected in three aspects of idle, harmonic wave and negative phase-sequence.Wherein, due to various types of dynamic passive compensations (SVG, SVC), the popularization and application of active filter (APF) and locomotive high-power factory rectifier (HPF-Rectifier), it is idle and Harmonic problem has obtained a degree of control, but to the improvement of negative sequence component even without obtaining positive effect.
The problem of electric railway negative sequence component, root are that the traction substation of electric railway is taken using three-phase The structure of electricity, single phase power supply, can be one although circulating the technological means such as single-phase by balancing transformer (Scott), three-phase wheel Determine to reduce negative sequence component in degree, but due to locomotive load entirely power supply section distribution space-time inhomogeneities clearly, Therefore solve the problems, such as that negative sequence component should set about carrying out from method of supplying power to.
Patent of invention 201310487237.2 provides a kind of cophase supply device and trailer system, mainly for using flat The tractive power supply system of weighing apparatus transformer (Soctt) does not have effect, Er Qiehui to using the tractive power supply system of direct power-supplying forms Original power supply section of Traction Station is caused to change.Patent of invention 201511032376.1 provides a kind of modular multilevel knot Tractive power supply system is directly handed in the friendship of structure, is realized transformation of electrical energy using the current transformer of MMC structure, is not easy to realize redundancy, control technology Complexity, maturity are slightly lower.It is single-phase that invention 201510104620.4 provides a kind of three-phase for power supply system of electric traction turn Converter, using diode rectification, the structure of thyristor inversion, transformer boosting, diode rectifier can not absorb locomotive and return In addition the electric energy of feedback cannot realize redundancy and spare, reliability is relatively low.Invention 200910041299.4 provides track electric power machine The traction cophase supply device of vehicle is needed significantly to change the original connection type of traction substation, needed to configure Function adjuster and Reactive-power control device, system complex, practicability are to be improved.
Existing traction power supply net is divided into the section that powers one by one, the voltage not phase of Traction networks in each power supply section Together, therefore train can lead to the problem of short term outage when crossing section and cross section and impact, equal to train and Traction networks Cause security risk.
In addition, electric railway traction power supply system is influenced vulnerable to seasonal congeal with extreme weathers such as icing, need Independent mating deicing device needs patch, workload is very by taking mobile DC de-icing device as an example when coming into operation Greatly, the utilization rate of deicing device is also very low, but needs ice-melt often if any a plurality of route and be difficult to take into account.
Summary of the invention
The present invention provides single phase power supply device, electric railway traction power supply system and its control method, by will high electricity Pressure is decomposed into the technological means that multiple low-voltages, three-phase uniformly undertake load, single-phase superposition output, solves existing electrified iron The long-standing electric energy pollution problem of road tractive power supply system.
Single phase power supply device of the present invention adopts the following technical scheme that realize: single phase power supply device, including Multiple coil transformation Device, several power conversion units and master controller;The multiwinding transformer includes a high pressure primary side winding and multiple low pressure The group number of vice-side winding, vice-side winding is P, and every group of vice-side winding is K to the no-load voltage ratio of primary side winding, every group of vice-side winding and one The input terminal of a power conversion unit is correspondingly connected with;The output end of several power conversion units is sequentially connected, and from first function The L arm of rate converting unit draws the first output end of the single phase power supply device, draws from the R arm of the P power conversion unit The second output terminal of the single phase power supply device;The master controller is connected with each power conversion unit, controls each power The operation of converting unit.
Electric railway traction power supply system of the present invention adopts the following technical scheme that realize: electric railway traction power supply System, including power supply isochronous controller, several aforementioned single phase power supply devices and several section interconnection switches;The synchronous control of the power supply Device processed is connect with each single phase power supply device and each section interconnection switch respectively;The single phase power supply device is used for three-phase electricity It presses after being converted to single-phase voltage to train power supply, the first output end is connected with feed line, and second output terminal is connected with return wire;Institute Section interconnection switch is stated to connect with the feed line in two neighboring power supply section.
The control method of electric railway traction power supply system of the present invention, comprising the following steps:
S1., supply voltage virtual value, frequency and the phase of controlled Traction networks are set, power isochronous controller according to set by The synchronic command of supply voltage virtual value, frequency and phase calculation Traction networks, the synchronic command include a single-phase alternating current Virtual value, frequency and the phase information of pressure;
S2. synchronic command and operating instruction are sent to the master controller of each single phase power supply device by power supply isochronous controller, The output voltage of single phase power supply device belonging to controlling after master controller reception synchronic command and operating instruction reaches synchronic command It is required that;
S3. master controller measure belonging to single phase power supply device output voltage, calculate the virtual value of output voltage, frequency and Phase, and compared item by item with synchronic command, then output voltage is finely adjusted if any deviation;It is effective when output voltage When value, frequency and phase consistent with synchronic command, then signal is completed to power supply isochronous controller feedback synchronization;
S4. power supply isochronous controller receive whole single phase power supply devices feedback synchronously complete signal after, control interval Interconnection switch is successively closed.
Preferably, step S2 includes:
S2.1 main controller controls multiwinding transformer and power conversion unit charging, the conversion of main controller controls power are single The rectification circuit of member works in constant dc die pressing type, and DC voltage reaches direct-current working volts Udc2;
The quantity P of the S2.2 master controller combination power conversion unit and direct-current working volts Udc2 of power conversion unit, Voltage rating Uce is converted pwm signal by the voltage rating Uce for calculating each power conversion unit inverter circuit, then will Pwm signal is issued to each unit control panel, makes the inverter circuit output single-phase alternating voltage Uco of power conversion unit;Often The output voltage of one power conversion unit, which stacks up, constitutes the output voltage Uo of the single phase power supply device;When power is converted When unit output voltage is gradually increased to voltage rating, single phase power supply device output voltage Uo has reached the requirement of synchronic command.
The control method further comprises the steps of:
S5.1 bypasses power conversion unit: a certain group of vice-side winding of multiwinding transformer or the conversion of some power are single When member breaks down, master controller issues bypass instruction, the conducting of order bypass circuit, rectification to the unit control panel of abort situation Circuit stops working;Master controller recalculates pwm signal according to remaining power conversion unit quantity simultaneously, controls remaining Power conversion unit improves output voltage, to maintain the output voltage stabilization of this single phase power supply device in synchronic command requirement It is horizontal.
The control method further comprises the steps of:
S5.2 bypasses single phase power supply device: when certain single phase power supply device orderly closedown or disorderly closedown, master control Device stopping processed issuing pwm signal, and order unit control panel stops rectification circuit work, disconnects bypass circuit, controls the single-phase confession Electric installation major loop and three-phase voltage, transmission network and return wire disconnect, originally the corresponding power supply section of this single phase power supply device Electric energy is obtained from adjacent interval by section interconnection switch, maintains section continued power.
The control method further includes DC ice melting or exchange ice-melt step;The DC ice melting step are as follows:
S11. master controller issues bypass instruction, the bypass circuit of whole power conversion units is connected, single-phase confession at this time The voltage of electric installation output is zero;
S12. send instructions under master controller, the bypass circuit of the first power conversion unit of control disconnects, while issuing one The pwm signal completely modulated controls the power conversion unit and exports its direct-current working volts Udc2, remaining power conversion unit is motionless Make, the DC voltage of single phase power supply device output at this time is Udc2, and Traction networks and return current rail start to generate DC current;
S13. it according to process described in S12 step, successively controls dump power converting unit and exports its direct-current working volts, have J power conversion unit work, then single phase power supply device output DC voltage is j*Udc2, with the increase of j, the direct current of generation Electric current will move closer to setting value Irb;
S14. the size of master controller detection output electric current, if DC current does not reach when j power conversion unit of starting To setting value, and start j+1 more than if setting value, then only starting j is a;
The exchange ice-melt step are as follows:
S21. ice-melt frequency of the master controller according to setting, the modulation depth for being gradually increased and calculating pwm signal of starting from scratch, Pwm signal is handed down to whole unit control panels;
S22. after unit control panel receives pwm signal, the output voltage for controlling power conversion unit, which is started from scratch, gradually to be increased Greatly, therefore single phase power supply device one frequency of output is Fbr, the alternating voltage that virtual value is gradually increased;
S23. as single phase power supply device output voltage virtual value is gradually increased, the electric current of Traction networks and return current rail is flowed through Start to increase with it, when master controller detects that output electric current has reached setting value Irb, then stops increasing modulation depth, dimension Electric current is held to stablize in Irb.
Compared with prior art, the present invention include it is following the utility model has the advantages that
1, single phase power supply device provided by the invention by by high voltage decompose multiple low-voltages, three-phase uniformly undertake it is negative The technological means that lotus, single-phase superposition export, realizes conversion of the electric energy from three-phase alternating current to single phase ac, conversion process is to three-phase side For be complete equipilibrium, solve the long-standing electric energy pollution problem of electric railway traction power supply system.
2, the single-phase electric energy frequency and virtual value exported is fully controllable, can be adjusted flexibly, can meet different power frequencies The demand of the electric railway of standard (50Hz or 60Hz).
3, the present invention generates total synchronic command by isochronous controller of powering, and control single phase power supply device output is consistent Single-phase voltage solves a series of problems that train crosses section so that Traction networks break the limitation powered according to section.
4, other than conventional electron function, single phase power supply device provided by the invention can also mention for feed line and return wire For direct current and the ice-melt function of exchanging two kinds of different modes, the utilization rate of equipment is greatly improved, reduces and ice-melt is separately configured The investment and workload of device.
Detailed description of the invention
Fig. 1 is a kind of electric railway traction power supply system topology diagram of the present invention;
Fig. 2 is the topology diagram of single phase power supply device of the present invention;
Fig. 3 is the topology diagram of power conversion unit of the present invention;
Fig. 4 is the relational graph of synchronic command Cs of the present invention, pressuring curve and power conversion unit output voltage;
Fig. 5 is the graph of relation of separate unit single phase power supply device output voltage Uo, curve of output Co and synchronic command Cs;
Fig. 6 is that each power supply section does not complete contact, the schematic diagram powered by corresponding single phase power supply device;
Fig. 7 is that the electrical schematic after contact is completed in each power supply section;
Fig. 8 is the schematic diagram that certain single phase power supply plant failure is bypassed rear haulage power supply network;
Fig. 9 is the equivalence electricity that P-j j power conversion unit, bypass power conversion unit are put under DC ice melting mode Road;
Figure 10 is the equivalent circuit exchanged under ice-melt mode.
Specific embodiment
Below with reference to embodiment and Figure of description, the invention will be further described, but embodiments of the present invention are unlimited In this.
Embodiment
As shown in Figure 1, electric railway traction power supply system of the present invention includes power supply isochronous controller 1, several single-phase confessions Electric installation 2 and several section interconnection switches 3, power supply isochronous controller are responsible for virtual value, frequency and the phase of Traction networks whole network voltage Position is consistent, and single phase power supply device realizes that three phase mains is converted into synchronous single phase poaer supply according to synchronic command, and section contact is opened It is unified whole that connection, which connects each power supply section,.Wherein power supply isochronous controller 1 respectively with each single phase power supply device 2 and each Section interconnection switch 3 connects, and is responsible for the work of control each single phase power supply device 2 and each section interconnection switch 3;Single phase power supply The input terminal of device 2 is connected with three phase mains, and the output end of single phase power supply device 2 is connected with feed line, return wire, is responsible for three Phase voltage is converted to after single-phase voltage to train power supply;Section interconnection switch 3 is connect with the feed line in two neighboring section, is responsible for Control the connection relationship in two neighboring power supply section.Adjacent power supply section is connected by section interconnection switch 3, constitutes unification Traction power supply net.The input terminal of single phase power supply device 2 is connected with the output end of tractive transformer, input voltage 27.5kV;It is single First output end of phase power supply unit 2 is connected with the feed line in corresponding section, and second output terminal is connected with return wire, such as Fig. 2 institute Show.Single phase power supply device can also be powered by the high voltage power supply of independent 35kV or other higher voltage grades, single phase power supply dress The power supply mode set does not influence the topological structure and control method of device noumenon.
As shown in Fig. 2, single phase power supply device 2 includes input switch 2.1, charge switch 2.2, charging resistor 2.3, Multiple coil Transformer 2.4, several power conversion units 2.5, first export switch 2.6, second and export switch 2.7, input current sensor 2.8, output voltage sensor 2.9, output current sensor 2.10 and master controller 2.11.The inlet wire of the input switch 2.1 End is connected with three-phase high-voltage power supply, and leading-out terminal is connected with the primary side winding of the multiwinding transformer 2.4, and three-phase high-voltage power supply can Be traction substation tractive transformer output end (27.5kV), be also possible to independent high voltage power supply (35kV) all the way, The present embodiment selects the output end of tractive transformer as three-phase high-voltage power supply.The end of incoming cables of the charge switch 2.2 and three-phase High voltage power supply is connected, and leading-out terminal is connected with 2.3 end of incoming cables of charging resistor, and 2.3 leading-out terminal of charging resistor is opened with the input The leading-out terminal of pass 2.1 is connected, i.e., charge switch 2.2 and charging resistor 2.3 are in parallel with input switch 2.1 after connecting.It is described mostly around Group transformer 2.4 is made of a high pressure primary side winding and multiple low voltage secondary windings, and the group number of vice-side winding is P, every group of pair Side winding is K to the no-load voltage ratio of primary side winding, and couples, is electrically isolated from one another with primary side three-phase windings, every group of vice-side winding with The input terminal of one power conversion unit 2.5 is correspondingly connected with;The effect of multiwinding transformer is to decompose a three-phase high voltage At multiple completely the same three-phase low-voltages.The output end of whole power conversion units 2.5 is sequentially connected;First power conversion The L arm of unit is connected with the first output switch 2.6, and as the first output end of single phase power supply device 2, the P power conversion is single The R arm of member is connected with the second output switch 2.7, the second output terminal as single phase power supply device 2.
For acquiring single phase power supply device input current, primary side is connected on input and opens the input current sensor 2.8 It closes between 2.1 and 2.4 primary side winding of multiwinding transformer;The output voltage sensor 2.9 is for acquiring single phase power supply device Output voltage, primary side is connected in parallel between the L arm of first power conversion unit and the R arm of the P power conversion unit;Institute The output electric current that output current sensor 2.10 is used to acquire single phase power supply device is stated, primary side is connected on first power conversion Between the L arm of unit and the first output switch 2.6.Master controller 2.11 passes through optical fiber 2.12 and each power conversion unit 2.5 It is connected, controls the operation of each power conversion unit 2.5;Switch 2.6 is exported by secondary cable and input switch 2.1, first It is connected with the control terminal of the second output switch 2.7, the movement of control input switch, the first output switch and the second output switch; By secondary cable and the input current sensor 2.8 it is secondary while, output voltage sensor 2.9 it is secondary while and output electric current pass The secondary side of sensor 2.10 is connected.
Wherein, the topological structure of the power conversion unit 2.5 is as shown in figure 3, include rectification circuit 2.5.1, direct current The exchange end for holding 2.5.2, inverter circuit 2.5.3, bypass circuit 2.5.4 and unit control panel 2.5.5, rectification circuit 2.5.1 is The input terminal of power conversion unit 2.5, DC terminal, the DC terminal and DC capacitor of inverter circuit 2.5.3 of rectification circuit 2.5.1 2.5.2 it is connected according to positive-negative polarity is corresponding, the exchange end of inverter circuit 2.5.3 is the output end of power conversion unit 2.5, bypass Circuit 2.5.4 is connected in parallel on the output end of power conversion unit 2.5.Unit control panel 2.5.5 passes through optical fiber 2.12 and master controller 2.11 are connected, and unit control panel 2.5.5 also connects with rectification circuit 2.5.1, inverter circuit 2.5.2 and bypass circuit 2.5.4 respectively It connects, receives all parts work in the instruction control power conversion unit 2.5 of master controller 2.11.In the present embodiment, preferably For the three-phase bridge constituted using IGBT as rectification circuit 2.5.1, the H bridge constituted using IGBT is single-phase as inverter circuit 2.5.3 A.C. contactor is as bypass circuit 2.5.4;Wherein IGBT can use the all-controlling power electronics devices such as IGCT, IEGT substitution, single Phase A.C. contactor can be substituted with bidirectional thyristor etc..
Electric railway traction power supply system of the present invention is controlled by following steps:
S1. manually the parameter of power supply isochronous controller 1 is configured, the supply voltage ginseng of clear controlled Traction networks Number, including voltage effective value, frequency and phase, power supply isochronous controller 1 calculate the synchronic command of Traction networks according to institute's setting parameter, The synchronic command contains virtual value, frequency and the phase information of a single-phase AC voltage.
S2. synchronic command and operating instruction are sent to the master controller of each single phase power supply device by power supply isochronous controller 1 2.11, master controller 2.11 controls affiliated single phase power supply device after receiving synchronic command Cs and operating instruction as steps described below Work:
S2.1 shutdown → standby
Main controller controls charge switch closure, multiwinding transformer and power conversion unit begin through charging resistor into Row charging;After charging time T1, the DC voltage of each power conversion unit by it is basicly stable it is pre- supplement Udc1 with money, it is main Controller successively controls input switch closure, charge switch disconnects;After catch time T2, main control passes through bristles with anger under optical fiber It enables to the unit control panel of power conversion unit, the rectification circuit of power conversion unit is made to enter constant dc die pressing type, root According to the working principle of three-phase PWM reorganizer, DC voltage is lifted upper to operating voltage Udc2;After upper lift time T3, master control Device control the first output switch processed and the second output close the switch, by the first output end and feed line phase of single phase power supply device Even, second output terminal is connected with return wire.
After the above process, separate unit single phase power supply device input switch closure, the first output switch, the second output switch The rectification circuit of closure, power conversion unit works in constant dc die pressing type, and DC voltage reaches operating voltage Udc2, dress It sets and enters standby mode.The change procedure of power conversion unit DC voltage is as shown in Figure 4.
S2.2 is standby → operation
Master controller draws curve of output Co according to the synchronic command Cs received and pressing time T4 being manually arranged, then In conjunction with the quantity P of the power conversion unit and direct-current working volts Udc2 of power conversion unit, it is single to calculate the conversion of each power The voltage rating Uce of first inverter circuit turns voltage rating Uce according to the principle of power electronics sine wave pulse width modulated Pwm signal is turned to, pwm signal is issued to by each unit control panel by optical fiber, makes the inverter circuit of power conversion unit Output single-phase alternating voltage Uco;The output voltage Ucon (n=1.2 ... P) of each power conversion unit stacks up, just Constitute the output voltage Uo of the single phase power supply device, i.e. Uo=∑ Ucon;When power conversion unit output voltage gradually increases When greatly to voltage rating, i.e. Uco=Uce, device output voltage Uo is the requirement for having reached synchronic command Cs.By the above process Afterwards, a single phase power supply device starts to provide stable single phase industrial frequence voltage to feed gauze and return wire, into operating status.
The relationship of separate unit single phase power supply device output voltage Uo, curve of output Co and synchronic command Cs are as shown in Figure 5.With state For the interior common power supply system of electric railway is 27.5kV/50Hz, the virtual value of supply voltage is contained in synchronic command 27.5kV, frequency 50Hz and 0 ° of initial phase of synchronizing information, master controller receive synchronic command after in conjunction with pressing time T4 Curve of output Co is generated, and controls single phase power supply device and maintains 0 ° of initial phase, the fixed frequency 50Hz (period of i.e. each cycle For 20ms), step up requirement of the output voltage (virtual value has reached 27.5kV in 1000ms) to reach synchronic command.? In external electric railway, the case where common power frequency is 60Hz, in order to adapt to this power supply system, it is only necessary to same by what is issued Frequency in step instruction is changed to 60Hz, and remaining process is consistent.
S3. every master controller measures the single phase power supply by the output voltage sensor of affiliated single phase power supply matched with devices The output voltage Uo of device calculates virtual value, frequency and the phase of output voltage, and compares item by item with synchronic command Cs, Then output voltage Uo is finely adjusted if any deviation.When the virtual value of output voltage, frequency and phase are consistent with synchronic command Cs When, then signal is completed to power supply isochronous controller feedback synchronization.All power supply sections are charged at this time, and supply voltage has Valid value, frequency and phase are fully synchronized.
At this time without completing contact on each power supply section, each power supply section is powered by corresponding single phase power supply device, As shown in Figure 6.
S4. after power supply isochronous controller receives whole single phase power supply device feedback synchronizations completion signals, control interval connection Network switch is successively closed, and the feed line in the section that powers all is connected, and entire traction power set investment finishes, whole single phase power supplies Form in parallel is presented in device, and work can provide the stable, electric energy without interruption in unified voltage level for train.
After section interconnection switch closure, contact is completed in each power supply section, and the power supply for becoming unified is whole, each single-phase confession Electric installation becomes the parallel operation power supply of synchronous working, as shown in Figure 7.
S5. in order to guarantee the reliability of entire tractive power supply system, it is necessary to consider power conversion unit failure even certain After single phase power supply plant failure, the case where whole system can continue to run:
S5.1 power conversion unit failure
Once there is the case where a certain group of vice-side winding or failure of some power conversion unit, master controller is then Bypass instruction, the conducting of order bypass circuit are issued to the unit control panel of abort situation by optical fiber, rectification circuit stops working, To which the power conversion unit of abort situation be cut off;Master controller is counted again according to remaining power conversion unit quantity simultaneously Pwm signal is calculated, remaining power conversion unit is controlled and improves output voltage, to maintain the output voltage of this single phase power supply device Stablize the level required in synchronic command Cs.
Such as the first power conversion unit breaks down in the process of running, that master controller then passes through to send instructions under optical fiber So that the rectification circuit of the first power conversion unit stops working, it is closed at bypass contactor, which is converted single Member excision;Synchronous adjustment is issued to the pwm pulse signal of remaining P-1 power conversion unit, makes dump power converting unit Output voltage becomes 27.5kV/ (P-1), maintains the level of single phase power supply device overall output voltage.
S5.2 single phase power supply plant failure
When certain single phase power supply device orderly closedown or disorderly closedown, master controller stopping issues pwm signal, Order unit control panel stops rectification circuit work, disconnection bypass circuit, and control first exports switch, the second output switchs and defeated Enter to switch all off, which is fully disconnected with high voltage power supply, transmission network and return wire, originally this The corresponding power supply section of device obtains electric energy from adjacent interval by section interconnection switch, maintains section continued power.Certain list After phase power supply unit failure exits, the state of traction power supply net is as shown in Figure 8.
Electric railway traction power supply system of the present invention is additionally provided with ice-melt function.The ice-melt function of system is divided into two kinds of moulds Formula: DC ice melting with exchange ice-melt, the first step for starting ice-melt function is identical with conventional electron, i.e. system standby, is then arranged Ice-melt mode and ice melting current Irb start after parameter setting is good if selection AC mode also needs to be arranged ice-melt frequency Frb Single phase power supply device, master controller control single phase power supply device as steps described below and carry out ice-melt.
(1) DC ice melting
S11. master controller issues bypass instruction by optical fiber, and the bypass circuit of whole power conversion units is connected, this When single phase power supply device output voltage be zero;
S12. master controller under optical fiber by sending instructions, and the bypass circuit of the first power conversion unit of control disconnects, simultaneously The pwm signal completely modulated is issued, the unit is controlled and exports its direct-current working volts Udc2, remaining element is failure to actuate, at this time The DC voltage of single phase power supply device output is Udc2, and Traction networks and return current rail start to generate DC current;
S13. it according to process described in S12 step, successively controls dump power converting unit and exports its direct-current working volts, have J power conversion unit work, then single phase power supply device output DC voltage is j*Udc2, with the increase of j, the direct current of generation Electric current will move closer to setting value Irb;
S14. master controller exports the size of electric current by output current sensor detection, if j power conversion of starting DC current is not up to setting value when unit, and starts j+1 more than if setting value, then only starting j is a, guarantees single-phase confession The electric current of electric installation output is no more than setting value.
Fig. 9 show put under DC ice melting mode j power conversion unit, bypass P-j power conversion unit etc. It is worth circuit, wherein Rgr-dc is the equivalent d.c. resistance of ice-melt section contact net and return current rail, and Igr-dc is to flow through ice-melt section DC current, Igr-dc≤Irb.
(2) ice-melt is exchanged
S21. ice-melt frequency of the master controller according to setting, the modulation depth for being gradually increased and calculating pwm signal of starting from scratch, Pwm signal is handed down to whole unit control panels by optical fiber;
S22. after unit control panel receives pwm signal, the output voltage for controlling power conversion unit, which is started from scratch, gradually to be increased Greatly, therefore single phase power supply device one frequency of output is Fbr, the alternating voltage that virtual value is gradually increased;
S23. as single phase power supply device output voltage virtual value is gradually increased, the electric current of Traction networks and return current rail is flowed through Start to increase with it, when master controller detects that output electric current has reached setting value Irb, then stops increasing modulation depth, dimension Electric current is held to stablize in Irb.
Figure 10 show the equivalent circuit under exchange ice-melt mode, and wherein Rgr-ac, Lgr-ac are ice-melt section contact net With the equivalent AC resistance and equivalent inductance of return current rail, Igr-ac is the alternating current for flowing through ice-melt section, Igr-ac=Irb.
Ice-melt mode is generally preferably exchanged, because the kelvin effect of alternating current can make the equivalent of same section of ice-melt section Resistance is bigger, can achieve more good fever ice-melt effect in the case where same current virtual value.In order to guarantee contact net Obvious with the kelvin effect of return current rail, set ice-melt frequency is generally few kilohertz (kHz) or more.
As described above, the present invention can be better realized.The above embodiment is a preferred embodiment of the present invention, but this hair Bright embodiment is simultaneously not restricted to the described embodiments, other any institutes without departing from the spirit and principles of the present invention The changes, modifications, substitutions, combinations, simplifications of work should be equivalent substitute mode, be included in protection scope of the present invention it It is interior.

Claims (5)

1. a kind of control method of electric railway traction power supply system, which is characterized in that electric railway traction power supply system Including power supply isochronous controller, several single phase power supply devices and several section interconnection switches;The power supply isochronous controller difference It is connect with each single phase power supply device and each section interconnection switch;
The single phase power supply device includes multiwinding transformer, several power conversion units and master controller;The Multiple coil becomes Depressor includes a high pressure primary side winding and multiple low voltage secondary windings, and the group number of vice-side winding is P, and every group of vice-side winding is to original The no-load voltage ratio of side winding is K, and the input terminal of every group of vice-side winding and a power conversion unit is correspondingly connected with;Several power conversions The output end of unit is sequentially connected, and draws the first defeated of the single phase power supply device from the L arm of first power conversion unit Outlet draws the second output terminal of the single phase power supply device from the R arm of the P power conversion unit;The master controller with Each power conversion unit is connected, and controls the operation of each power conversion unit;
The single phase power supply device is used to be converted to three-phase voltage after single-phase voltage to train power supply, the first output end and feed Line connection, second output terminal are connected with return wire;The section interconnection switch is connect with the feed line in two neighboring power supply section; The power supply isochronous controller exports synchronic command and operating instruction, master controller root to the master controller of each single phase power supply device Reach the requirement of synchronic command according to the output voltage that synchronic command and operating instruction control affiliated single phase power supply device;
The following steps are included:
S1., supply voltage virtual value, frequency and the phase of controlled Traction networks are set, and isochronous controller of powering is according to set power supply The synchronic command of voltage effective value, frequency and phase calculation Traction networks, the synchronic command include a single-phase AC voltage Virtual value, frequency and phase information;
S2. synchronic command and operating instruction are sent to the master controller of each single phase power supply device, master control by power supply isochronous controller The output voltage of single phase power supply device belonging to controlling after device reception synchronic command and operating instruction processed reaches the requirement of synchronic command;
S3. master controller measures the output voltage of affiliated single phase power supply device, calculates virtual value, frequency and the phase of output voltage Position, and compared item by item with synchronic command, then output voltage is finely adjusted if any deviation;When output voltage virtual value, When frequency and phase consistent with synchronic command, then signal is completed to power supply isochronous controller feedback synchronization;
S4. power supply isochronous controller receive whole single phase power supply devices feedback synchronously complete signal after, control interval contact Switch is successively closed.
2. control method according to claim 1, it is characterised in that step S2 includes:
S2.1 main controller controls multiwinding transformer and power conversion unit charging, main controller controls power conversion unit Rectification circuit works in constant dc die pressing type, and DC voltage reaches direct-current working volts Udc2;
The quantity P of the S2.2 master controller combination power conversion unit and direct-current working volts Udc2 of power conversion unit is calculated The voltage rating Uce of each power conversion unit inverter circuit converts pwm signal for voltage rating Uce, then by PWM Signal is issued to each unit control panel, makes the inverter circuit output single-phase alternating voltage Uco of power conversion unit;Each The output voltage of power conversion unit, which stacks up, constitutes the output voltage Uo of the single phase power supply device;Work as power conversion unit When output voltage is gradually increased to voltage rating, single phase power supply device output voltage Uo has reached the requirement of synchronic command.
3. control method according to claim 1, it is characterised in that the control method further comprises the steps of:
S5.1 bypasses power conversion unit: a certain group of vice-side winding of multiwinding transformer or some power conversion unit go out When existing failure, master controller issues bypass instruction, the conducting of order bypass circuit, rectification circuit to the unit control panel of abort situation It stops working;Master controller recalculates pwm signal according to remaining power conversion unit quantity simultaneously, controls remaining power Converting unit improves output voltage, to maintain the output voltage stabilization of single phase power supply device in the level of synchronic command requirement.
4. control method according to claim 1, it is characterised in that the control method further comprises the steps of:
S5.2 bypasses single phase power supply device: when certain single phase power supply device orderly closedown or disorderly closedown, master controller Stopping issues pwm signal, and order unit control panel stops rectification circuit work, disconnects bypass circuit, controls single phase power supply dress It sets major loop and three-phase voltage, transmission network and return wire disconnects, originally the corresponding power supply section of this single phase power supply device passes through Section interconnection switch obtains electric energy from adjacent interval, maintains section continued power.
5. control method according to claim 1, it is characterised in that the control method further includes DC ice melting or exchange Ice-melt step;The DC ice melting step are as follows:
S11 master controller issues bypass instruction, and the bypass circuit of whole power conversion units is connected, and single phase power supply fills at this time The voltage for setting output is zero;
Send instructions under S12 master controller, the bypass circuit of the first power conversion unit of control disconnects, while issuing a full tune The pwm signal of system controls the power conversion unit and exports its direct-current working volts Udc2, remaining power conversion unit is failure to actuate, The DC voltage of single phase power supply device output at this time is Udc2, and Traction networks and return current rail start to generate DC current;
S13 successively controls dump power converting unit and exports its direct-current working volts, there is j according to process described in S12 step Power conversion unit work, then single phase power supply device output DC voltage is j*Udc2, with the increase of j, the direct current of generation Stream will move closer to setting value Irb;
The size of S14 master controller detection output electric current, if DC current is not up to set when j power conversion unit of starting Definite value, and start j+1 more than if setting value, then only starting j is a;
The exchange ice-melt step are as follows:
Ice-melt frequency of the S21 master controller according to setting, the modulation depth for being gradually increased and calculating pwm signal of starting from scratch will Pwm signal is handed down to whole unit control panels;
After S22 unit control panel receives pwm signal, the output voltage for controlling power conversion unit, which is started from scratch, to be gradually increased, Therefore it is Fbr, the alternating voltage that virtual value is gradually increased that single phase power supply device, which exports a frequency,;
S23 is gradually increased with single phase power supply device output voltage virtual value, and the electric current for flowing through Traction networks and return current rail is also opened Beginning increases with it, and when master controller detects that output electric current has reached setting value Irb, then stops increasing modulation depth, maintain Electric current is stablized in Irb.
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