CN108146297B - Ground electricity split-phase continuous power supply system for electrified railway - Google Patents
Ground electricity split-phase continuous power supply system for electrified railway Download PDFInfo
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- CN108146297B CN108146297B CN201711492572.6A CN201711492572A CN108146297B CN 108146297 B CN108146297 B CN 108146297B CN 201711492572 A CN201711492572 A CN 201711492572A CN 108146297 B CN108146297 B CN 108146297B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
- H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
- H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
- H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
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Abstract
The invention provides a ground electric split-phase continuous power supply system of an electrified railway, which comprises a high-voltage switch unit, a train direction and position detection unit and a signal processor, wherein the high-voltage switch unit is used for switching on and off high-voltage power supplies related to α -phase and β -phase traction buses, α -phase and β -phase traction power supply arms and comprises three high-voltage circuit breakers QF1, QF2 and QF4 and a resistance-capacitance absorber RC, a ground electric split-phase continuous power supply converter BLQ is used for carrying out alternating-direct-alternating power energy conversion on the connected traction bus power supply based on high-power electric electronic devices and supplying power to a contact network electric split-phase neutral section N, and the train direction and position detection unit comprises a train position sensor and a signal processor thereof, and the train position sensor sends train axle signals to the signal processor and is used for detecting the running direction and the arriving position of the train.
Description
Technical Field
The invention relates to the field of traction power supply of an electrified railway contact network, in particular to a ground electric split-phase continuous power supply system of an electrified railway.
Background
The traction network of the electrified railway in China adopts split-phase sectional single-phase power frequency alternating current power supply, and an isolation region of neutral electric split-phase of about 200-900 m exists every 30-60 km, which is called electric split-phase. Besides affecting the comfort and total running time of transportation and reducing the railway transportation capacity, the electric phase separation of the contact network can bring at least over 80 kilovolt operation overvoltage, possibly causing damage or failure of high-voltage equipment of a train, and meanwhile, frequent passing through of the phase separation can easily cause operation fatigue of drivers, so the electric phase separation of the contact network is always a high-fault area matched with an electromechanical bow net, and the electric phase separation of the contact network becomes a key constraint factor for the development of railways in China towards high speed and heavy load.
In order to solve the problem of power-off passing phase separation of electrified railway trains, two contact network power phase separation automatic passing phase separation technologies, namely a pole switch automatic power-off passing phase separation technology represented by Swiss AF company and a ground switch automatic switching passing phase separation technology represented by Japan, have been introduced in China.
The column switch automatic power-off passing neutral section equipment has the phenomena of over arc discharge, arc burning, line tripping and the like in the test process, and is not applied successfully.
The neutral section passing equipment based on automatic switching of the ground mechanical switch has a small number of applications in China, but practical application also shows the following defects: 1, the mechanical switch switching can not accurately control the phase, and overvoltage and overcurrent impact exists; 2, the mechanical switch has long switching time, and a neutral section has a longer electroless dead zone in the phase change process; 3, high overvoltage and overcurrent impact exists, and control software and a protection setting value of the train need to be modified; 4, mechanical switch life-span is low, needs regular maintenance and change, and later stage operation is with high costs. In recent years, the problem of interphase short circuit of a contact net caused by the failure of automatic switching of the neutral section passing equipment by the ground mechanical switch in the phase change is sometimes caused.
Aiming at some defects of the automatic switching over-phase separation technology of the ground mechanical switch, in recent years, related organizations develop research on the automatic switching over-phase separation technology based on the ground electronic switch, the technology is characterized in that the electronic switch is adopted to replace the mechanical switch, but the basic principle of switching over-phase separation is not changed, so that a neutral section still has an electroless dead zone inevitably in the phase change process, and the problems of overvoltage, overcurrent impact and the like are still brought to a train.
Disclosure of Invention
In order to solve the problems that in the prior art, a dead zone exists in the phase commutation process in the automatic switching neutral-section passing technology of a ground mechanical switch to bring overvoltage and overcurrent impact to a train and the like, the ground electric phase-splitting continuous power supply system of the electrified railway is provided.
The invention provides an automatic passing continuous power supply system for electrified railway ground, which comprises a high-voltage switch unit, a power supply unit and a power supply unit, wherein the high-voltage switch unit is used for switching on and off high-voltage power supplies related to α -phase traction buses, β -phase traction buses, α -phase traction power supply arms and β -phase traction power supply arms;
the ground electric phase-splitting continuous power supply converter BLQ is used for carrying out AC-DC-AC energy conversion on an accessed traction bus power supply based on a high-power electronic device and supplying power to a contact network electric phase-splitting neutral section N;
the train direction and position detection unit comprises a train position sensor and a signal processor thereof, wherein the train position sensor sends a train wheel shaft signal to the signal processor for detecting the running direction and the arrival position of a train;
the high-voltage switch unit comprises three high-voltage circuit breakers QF1, QF2, QF4 and a resistance-capacitance absorber RC, wherein a feed-in bus of the circuit breaker QF1 is connected with a α -phase traction bus, a feed-in bus of the circuit breaker QF2 is connected with a β -phase traction bus, feed-out buses of the circuit breaker QF1 and the circuit breaker QF2 are connected together to form a common connection point and are connected to a high-voltage input terminal of a ground electric phase separation continuous power supply converter BLQ, a high-voltage feed-out terminal of the ground electric phase separation continuous power supply converter BLQ is connected to the feed-in bus of the circuit breaker QF4, a feed-out bus of the circuit breaker QF4 is connected to a neutral section N of a feed-in contact network electric phase separation, and a high-voltage terminal of the resistance-capacitance absorber RC is connected to the feed-in bus or.
The high-voltage switch unit further comprises a breaker QF3 and an auxiliary power supply conversion device FZDY, a feed-in bus of the breaker QF3 is connected with feed-out buses of the breaker QF1 and the breaker QF2, a feed-out bus of the breaker QF3 is connected to a high-voltage input terminal of the ground electrical phase separation continuous power supply converter BLQ, and the auxiliary power supply conversion device FZDY is connected to a common bus between the feed-out buses of the breaker QF1 and the breaker QF2 and the feed-in bus of the breaker QF 3.
The ground electric split-phase continuous power supply converter BLQ adopts a high-low-high converter topology with a step-down transformer as input, a step-up transformer as output and a low-voltage power electronic converter in the middle, and is an AC-DC-AC power converter composed of a single-phase multi-winding rectifier transformer, a single-phase multi-winding inverter transformer and a back-to-back four-quadrant converter, wherein the back-to-back four-quadrant converter comprises a rectifier unit, a DC unit and an inverter conversion unit, the rectifier unit and the inverter conversion unit respectively comprise n power modules, each power module adopts the same H-bridge conversion circuit, the rectifier transformer has a high-voltage winding AX connected with a feed-out bus of a circuit breaker QF3, the secondary side of the rectifier transformer is provided with n low-voltage windings a1x1 and a2x2 to anxn for supplying power to the rectifier unit power module, the single-phase multi-winding inverter transformer has n low-voltage windings c1x1 and n connected with the inverter conversion unit power module, c2x2 to cmxm, and a high-voltage winding CX on the secondary side is connected with a feed bus of a breaker QF 4; wherein n and m are both natural numbers greater than 1.
The power modules are all provided with two-level H-bridge conversion circuits, the direct current side of each power module comprises a positive direct current bus and a negative direct current bus, the positive direct current buses of all the power modules are connected in parallel to form a total common positive direct current bus, and the negative direct current buses of all the power modules are connected in parallel to form a total common negative direct current bus.
The power module comprises a plurality of power modules, wherein each power module adopts a three-level H-bridge conversion circuit, the direct current side of each power module comprises a positive direct current bus, a zero-level direct current bus and a negative direct current bus, the positive direct current buses of all the power modules are connected in parallel to form a total common positive direct current bus, the zero-level direct current buses of all the power modules are connected in parallel to form a total common zero-level direct current bus, and the negative direct current buses of all the power modules are connected in parallel to form a total common negative direct current bus.
The power modules adopt two-level H-bridge conversion circuits, the number m of the power modules of the inversion conversion unit is equal to the number n of the power modules of the rectification conversion unit, the back-to-back four-quadrant converter is composed of n electrically completely independent back-to-back four-quadrant converter sub-units, each back-to-back four-quadrant converter sub-unit is composed of a rectification power module and an inversion side power module, and positive direct current buses and negative direct current buses on direct current sides of the two power modules are connected in parallel to obtain a common direct current bus sub-unit.
The power modules all adopt three-level H-bridge conversion circuits, the number m of the power modules of the inversion conversion unit is equal to the number n of the power modules of the rectification conversion unit, the back-to-back four-quadrant converter is composed of n electrically completely independent back-to-back four-quadrant converter sub-units, each back-to-back four-quadrant converter sub-unit is composed of a rectification power module and an inversion side power module, a positive direct current bus, a zero direct current bus and a negative direct current bus are arranged on the direct current side of each power module, and the positive direct current buses, the zero direct current buses and the negative direct current buses on the direct current sides of the three power modules are connected in parallel to obtain a common direct current bus sub-unit.
The power module adopts a two-level H-bridge conversion circuit based on an IGBT and consists of a support capacitor, the IGBT, an anti-parallel diode, a current sensor and an output fuse.
The power module adopts a three-level H-bridge conversion structure based on an IGBT diode clamping type and consists of a support capacitor, a clamping diode, an anti-parallel diode, a current sensor and an output fuse.
The power module adopts a three-level H-bridge conversion circuit based on an IGCT diode clamping type and consists of an absorption capacitor, a DC-LINK LINK current limiting inductor, a DC-LINK LINK diode, a DC-LINK LINK resistor, a clamping diode, an IGCT and anti-parallel diode, a current sensor and an output fuse.
The ground electric phase separation continuous power supply converter BLQ adopts a direct high-high converter topology with high-voltage converters as input and output, and consists of a pre-charging unit, an MMC rectifying unit, a middle direct-current isolation conversion unit and an MMC inversion conversion unit; the pre-charging unit consists of a main switch QF and a pre-charging resistor R; the MMC rectifying unit and the MMC inversion conversion unit respectively comprise a left bridge arm and a right bridge arm, each bridge arm consists of an upper half bridge and a lower half bridge which are symmetrical, and the upper half bridge and the lower half bridge respectively comprise an electric reactor and n power modules which are connected in series; the power module is a half-bridge conversion circuit based on an IGBT power device and comprises an IGBT, an anti-parallel diode, T1, T2, a discharge resistor Rd and a support capacitor C.
The power module further comprises a thyristor and a bypass switch which are connected in parallel on one side of the anti-parallel diode T2; the intermediate direct-current isolation conversion unit is formed by directly connecting m direct-current isolation conversion modules DCM in series at a direct-current side.
The direct current isolation conversion module DCM consists of a rectification side support capacitor Cz, a direct current-alternating current-direct current isolation conversion unit and an inversion side support capacitor Cn, wherein the direct current-alternating current direct current isolation conversion unit consists of an H-bridge type DC-AC converter, a reactor Lr, a transformer Tr and an AC-DC converter.
The original winding and the secondary winding of the transformer Tr are respectively connected in series with a blocking capacitor Cr.
The direct current-alternating current direct current isolation conversion unit is formed by connecting k direct current-direct current converters in parallel on a direct current side.
The train direction and position detection unit comprises a sensor J1, a sensor J1 ', a sensor J2, a sensor J2', a sensor J3 and a sensor J3 ', wherein the sensor J1 and the sensor J1' are installed at two sides of a rail belonging to a α -phase traction power supply arm area, the sensor J2 and the sensor J2 'are installed at two sides of a rail belonging to a neutral section middle area, and the sensor J3 and the sensor J3' are installed at two sides of a rail belonging to a β -phase traction power supply arm area.
The train direction and position detection unit comprises four pairs of sensors including a sensor J1, a sensor J1 ', a sensor J21, a sensor J21', a sensor J21 and a sensor J21 ', wherein the sensor J21 and the sensor J21' are arranged on two sides of a rail belonging to a region of a traction power supply arm of 21 phase, the sensor J21 and the sensor J21 'are arranged on two sides of a rail belonging to a region of a neutral section close to a JY 21 joint, the sensor J21 and the sensor J21' are arranged on two sides of a rail belonging to a region of a traction power supply arm of 21 phase, the sensor J21 ', the sensor J21 and the sensor J21' are adopted as detection units when a train runs in the forward direction, the sensor J21 'and the sensor J21' are adopted as detection units when the train runs in the reverse direction.
According to the system provided by the invention, through the ground automatic passing continuous power supply system, the neutral section of the electric phase splitting is continuously supplied with power without a power supply dead zone, a train can continuously pass through the electric phase splitting, and the existence of the electric phase splitting cannot be sensed; the continuous power supply system with automatic neutral section passing on the ground supplies power to the contact network power split phase, and no overvoltage and overcurrent impact and no arc generation exist during the neutral section passing period of the train; the ground automatic cross-connection continuous power supply system adopts a high-power electronic converter as a core component, and has long service life and low operation and maintenance cost.
Drawings
FIG. 1 is a structural diagram of a ground electric phase separation continuous power supply system of an electrified railway according to an embodiment of the present invention;
FIG. 2 is a simplified system structure diagram of a ground phase separated continuous power supply system of an electrified railway according to an embodiment of the present invention;
FIG. 3 is a block diagram of a ground phase separated continuous power supply system for an electrified railway according to another embodiment of the present invention;
FIG. 4 is a main circuit diagram of a ground electric phase separation continuous power supply converter device in a ground electric phase separation continuous power supply system of an electrified railway according to an embodiment of the present invention;
FIG. 5 is a circuit topology diagram of a power module in a ground electric phase separation continuous power supply system of an electrified railway according to an embodiment of the present invention;
FIG. 6 is a main circuit diagram of a ground-electric-phase-separated continuous-power-supply converter device in a ground-electric-phase-separated continuous power-supply system of an electrified railway according to another embodiment of the present invention;
FIG. 7 is a circuit topology diagram of a power module in a ground electric phase separation continuous power supply system of an electrified railway according to another embodiment of the present invention;
FIG. 8 is a circuit topology diagram of a power module in a ground electrical phase separation continuous power supply system of an electrified railway according to another embodiment of the present invention;
FIG. 9 is a main circuit diagram of a ground-phase continuous power supply converter device in a ground-phase continuous power supply system of an electrified railway according to yet another embodiment of the present invention;
FIG. 10 is a schematic diagram of a main circuit of a split-phase continuous power supply converter for a split-phase continuous ground power supply system of an electrified railway according to still another embodiment of the present invention;
FIG. 11 is a main circuit diagram of an implementation manner of a high-high topology adopted by a ground electric phase separation continuous power supply converter device in a ground electric phase separation continuous power supply system of an electrified railway according to an embodiment of the present invention;
fig. 12 is a diagram of an embodiment of a power module of an MMC circuit rectifying unit and an MMC circuit inverting unit in a ground electric phase separation continuous power supply system of an electrified railway according to an embodiment of the present invention;
fig. 13 is a diagram of an embodiment of a power module of an MMC circuit rectifying unit and an MMC circuit inverting unit in a ground electric phase separation continuous power supply system of an electrified railway according to yet another embodiment of the present invention;
FIG. 14 is a diagram of an embodiment of a DC isolation converter module in a ground electrical phase separation continuous power supply system of an electrified railway according to an embodiment of the present invention;
FIG. 15 is a diagram of an embodiment of a DC isolation converter module in a ground electrical phase separation continuous power supply system of an electrified railway according to another embodiment of the present invention;
fig. 16 is a diagram of an embodiment of a dc isolation conversion module in a ground electrical phase separation continuous power supply system of an electrified railway according to yet another embodiment of the present invention.
The reference symbols are 1- α phase side single-phase multi-winding rectifier transformer T1, 2-rectifier conversion unit, 3-DC unit, 4-inverter conversion unit, 5- β phase side single-phase multi-winding inverter transformer T2, PM-power module, 11-pre-charge unit, 12-MMC rectifier unit, 13-DC isolation conversion unit, 14-MMC inverter conversion unit, 16-power module, 17-DC isolation conversion module DCM, 61-support capacitor, 62-IGBT and anti-parallel diode, 63-current sensor, 64-output fuse, 71-support capacitor, 72-clamp diode, 73-IGBT and anti-parallel diode, 74-current sensor, 75-output fuse, 81-absorption capacitor, 82-DC-LINK LINK current limiting inductor, 83-DC-LINK LINK diode, 84-DC-LINK LINK resistor, 85-clamp diode, 86-IGCT and anti-parallel diode, Cn 87-current sensor, 88-output fuse, 161-IGBT and anti-parallel LINK diode, 7-IGBT, 161-LINK LINK resistor, 163-IGBT and anti-parallel diode, IGBT-load capacitor, DC-AC switch, 173-DC isolation conversion unit, C-DC isolation conversion unit, 3-MMC rectifier unit, 17-DC isolation conversion unit, 75-DC isolation conversion unit, 75-DC isolation conversion unit, 81-LINK current limiting inductor, 82-.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Referring to fig. 1 and 2, a ground electric phase separation continuous power supply system for an electrified railway provided by an embodiment of the invention comprises a high-voltage switch unit, a phase-splitting switch unit and a phase-splitting switch unit, wherein the high-voltage switch unit is used for switching on/off high-voltage power supplies related to α phase traction buses, β phase traction buses, α phase traction power supply arms and β phase traction power supply arms;
the ground electric phase-splitting continuous power supply converter BLQ is used for carrying out AC-DC-AC energy conversion on an accessed traction bus power supply based on a high-power electronic device and supplying power to a contact network electric phase-splitting neutral section N;
the train direction and position detection unit comprises a train position sensor and a signal processor thereof, wherein the train position sensor sends a train wheel shaft signal to the signal processor for detecting the running direction and the arrival position of a train;
the high-voltage switch unit comprises three high-voltage circuit breakers QF1, QF2, QF4 and a resistance-capacitance absorber RC, wherein a feed-in bus of the circuit breaker QF1 is connected with a α -phase traction bus, a feed-in bus of the circuit breaker QF2 is connected with a β -phase traction bus, feed-out buses of the circuit breaker QF1 and the circuit breaker QF2 are connected together to form a common connection point and are connected to a high-voltage input terminal of a ground electric phase separation continuous power supply converter BLQ, a high-voltage feed-out terminal of the ground electric phase separation continuous power supply converter BLQ is connected to the feed-in bus of the circuit breaker QF4, a feed-out bus of the circuit breaker QF4 is connected to a neutral section N of a feed-in contact network electric phase separation, and a high-voltage terminal of the resistance-capacitance absorber RC is connected to the feed-in bus or.
Specifically, when a train passes through neutral phases, smooth continuous phase change of voltage on a neutral section is controlled, continuous power supply is carried out on a neutral section of a contact network electric phase separation, the train is not disconnected from power supply and phase separation, and arcs, overvoltage, overcurrent impact and the like cannot be generated.
The feeding bus of the breaker QF1 is connected with α -phase traction buses, the feeding bus of the breaker QF2 is connected with β -phase traction buses, the feeding buses of the breaker QF1 and the breaker QF2 are connected together to form a common connection point and connected with the feeding bus of the breaker QF3, the feeding bus of the breaker QF3 is connected with a high-voltage input terminal of a ground electric phase separation continuous power supply converter BLQ, the high-voltage feeding terminal of the ground electric phase separation continuous power supply converter BLQ is connected with the feeding bus of the breaker QF4, the feeding bus of the breaker QF4 is connected with a neutral section N of a contact network electric phase separation, the auxiliary power supply conversion device FZDY is connected with the common bus between the feeding bus of the breaker QF1 and the breaker QF2 and the feeding bus of the breaker QF3, the auxiliary power supply conversion device FZDY is obtained from the high-voltage bus, various auxiliary power supplies required by the operation of the high-voltage reduction and voltage stabilization system after passing through the auxiliary power supply conversion device FZDY, the high-voltage reduction and the high-side circuit breaker is connected with the high-side circuit breaker 4, the high-side traction bus of the high-side traction circuit breaker 1, the isolation switch (the high-side isolation switch), the high-isolation switch, the high-side isolation switch (the high-isolation switch) is connected with the high-isolation switch, the high-isolation switch (QF-isolation switch) and the high-isolation switch) of the high-isolation switch 1, the high-isolation switch (the high-isolation switch) and the high-isolation switch (the high-isolation switch) and the high-isolation switch) of the isolation switch (1, the isolation switch) which can be connected with the high-isolation switch) and the high-isolation switch (the.
For the situation that the system does not need to generate the auxiliary power supply by itself, as an improvement of the invention, on the basis of fig. 1, the high-voltage switch unit can be provided with no auxiliary power supply conversion device FZDY and no circuit breaker QF3 (and its matched disconnecting switch), and the schematic diagram of the system can be simplified as shown in fig. 2. However, the high-voltage switch unit is not limited to include these devices, and may further include a complementary isolating switch, a current transformer, a voltage transformer, a comprehensive protection device, and the like for signal detection. The auxiliary power supply conversion device FZDY is not limited to a specific circuit form, and can output a specific auxiliary power supply according to system requirements. The resistance-capacitance absorber in the embodiment of the invention is connected to the feed-in bus of QF4, which is a preferred embodiment, and can also be connected to the feed-in bus of QF4 as required.
Through the system, the neutral section of the electric phase separation is continuously supplied with power without a power supply dead zone, and a train can continuously pass through the electric phase separation without sensing the existence of the electric phase separation; the continuous power supply system with automatic neutral section passing on the ground supplies power to the contact network power split phase, and no overvoltage and overcurrent impact and no arc generation exist during the neutral section passing period of the train; the ground automatic cross-connection continuous power supply system adopts a high-power electronic converter as a core component, and has long service life and low operation and maintenance cost.
On the basis of the above embodiment, the ground electrical split-phase continuous power supply converter BLQ adopts a high-low-high converter topology with an input of a step-down transformer and an output of a step-up transformer and a middle of a low-voltage power electronic converter, and is an ac-dc-ac power converter composed of a single-phase multi-winding rectifier transformer (1), a single-phase multi-winding inverter transformer (5) and a back-to-back four-quadrant converter, the back-to-back four-quadrant converter includes a rectifier unit (2), a dc unit (3) and an inverter conversion unit (4), the rectifier unit (2) and the inverter conversion unit (4) respectively include n power modules, each power module adopts the same H-bridge conversion circuit, the primary side of the rectifier transformer (1) has a high-voltage winding AX connected with a feed-out bus of a circuit breaker QF3, the secondary side is provided with n low-voltage windings a1x1, a2x2 to anxn for supplying power to the power module of the rectifier unit of the converter, the primary side of the single-phase multi-winding inverter transformer (5) is provided with n low-voltage windings c1x1, c2x2 to cmxm which are connected with the power module of the inverter conversion unit of the converter, and the secondary side is provided with a high-voltage winding CX which is connected with a feed-in bus of the breaker QF 4; wherein n and m are both natural numbers greater than 1.
The ground electric phase separation continuous power supply converter BLQ is a four-quadrant converter based on power electronic devices, the input and the output of the four-quadrant converter are traction bus high voltage, and according to the current power electronic converter technology development, the four-quadrant converter BLQ has two converter topologies, wherein one topology is a high-low-high converter topology with a step-down transformer input and a step-up transformer output, and the middle is a low-voltage power electronic converter, and the other topology is a direct high-high converter topology with a high-voltage converter input and output.
The ground electricity split-phase continuous power supply converter device BLQ adopting a high-low-high current conversion topology is an AC-DC-AC power conversion device consisting of a single-phase multi-winding rectifier transformer T1, a single-phase multi-winding inverter transformer and a back-to-back four-quadrant converter, wherein the back-to-back four-quadrant converter comprises a rectifier unit and an inverter conversion unit, the rectifier unit comprises n power modules, the inverter conversion unit comprises m inverter power modules, the primary side of the rectifier transformer T1 is provided with a high-voltage winding AX, the secondary side of the rectifier transformer T1 is provided with n low-voltage windings a1x1 and a2x2 to anxn for supplying power to the rectifier unit power modules, the primary side of the single-phase multi-winding inverter transformer is provided with m low-voltage windings c1x1 and c2x2 which are connected with the inverter conversion unit power modules, and the secondary side of the single-phase multi.
For the ground electric phase-splitting continuous power supply converter adopting a high-low-high conversion topology, one implementation mode is as shown in fig. 4, and the ground electric phase-splitting continuous power supply converter mainly comprises a single-phase multi-winding rectifier transformer T11, a four-quadrant converter (comprising a rectifier unit 2, a direct-current isolation conversion unit 3 and an inversion conversion unit 4), and a single-phase multi-winding inverter transformer 5; the rectifying unit 2 and the inversion transformation unit 4 of the four-quadrant converter respectively comprise n power modules, and each power module adopts the same H-bridge transformation circuit; the primary side of the single-phase multi-winding rectifier transformer T11 is a high-voltage winding AX, and is connected to a feed-out bus of the QF3 circuit breaker (or a QF1 and QF2 common feed-out bus shown in fig. 2), the secondary side of the single-phase multi-winding inverter transformer 5 is provided with n low-voltage windings (a1x1, a2x2, … and anxn) for supplying power to the converter rectification unit power modules, the primary side of the single-phase multi-winding inverter transformer 5 is provided with n low-voltage windings (c1x1, c2x2, … and cnxn) connected to the converter inversion conversion unit power modules, the secondary side of the single-phase multi-winding inverter transformer 5 is provided with one high-voltage winding (CX), the output of each low-voltage winding is connected to the ac input terminals of the n power modules (PM1, PM2, PM … and PMn) corresponding to the rectification unit 2, the ac output terminals of the n power modules on the inversion side are connected to the n low-voltage windings. Other auxiliary windings may be designed on the secondary side of the single-phase multi-winding rectifier transformer T11, such as for pre-charging the transformer, etc., as required by the system design.
On the basis of the above embodiment, each power module adopts a two-level H-bridge conversion circuit, the dc side of each power module includes a positive dc bus and a negative dc bus, the positive dc buses of all the power modules are connected in parallel to form a total common positive dc bus, and the negative dc buses of all the power modules are connected in parallel to form a total common negative dc bus.
On the basis of the above embodiments, the power modules may further adopt a three-level H-bridge conversion circuit, the dc side of each power module includes a positive dc bus, a zero-level dc bus, and a negative dc bus, the positive dc buses of all the power modules are connected in parallel to form a total common positive dc bus, the zero-level dc buses of all the power modules are connected in parallel to form a total common zero-level dc bus, and the negative dc buses of all the power modules are connected in parallel to form a total common negative dc bus.
Specifically, as an improvement of this embodiment, as shown in fig. 6, a second embodiment is that the power modules are three-level H-bridge conversion circuits, the dc side of each power module has a positive dc bus, a zero-level dc bus and a negative dc bus, and the dc side positive dc buses, the zero-level dc buses and the negative dc buses of all the power modules are connected in parallel to form a total common positive, zero and negative dc bus.
On the basis of the above embodiment, preferably, the power modules all adopt two-level H-bridge conversion circuits, the number m of the power modules of the inversion conversion unit is equal to the number n of the power modules of the rectification conversion unit, the back-to-back four-quadrant converter is composed of n electrically completely independent back-to-back four-quadrant converter sub-units, the back-to-back four-quadrant converter sub-unit is composed of a rectification power module and an inversion side power module, and the positive direct current buses and the negative direct current buses on the direct current sides of the two power modules are connected in parallel to obtain a common direct current bus sub-unit.
Specifically, the power modules all adopt three-level H-bridge conversion circuits, the number m of the power modules of the inversion conversion unit is equal to the number n of the power modules of the rectification conversion unit, the back-to-back four-quadrant converter is composed of n electrically completely independent back-to-back four-quadrant converter sub-units, each back-to-back four-quadrant converter sub-unit is composed of a rectification power module and an inversion side power module, a positive direct current bus, a zero direct current bus and a negative direct current bus are arranged on the direct current side of each power module, and the positive direct current buses, the zero direct current buses and the negative direct current buses on the direct current sides of the two power modules are connected in parallel to obtain a common direct current bus sub-unit.
The third embodiment is improved, the fourth embodiment is that the converter power module is a three-level H-bridge conversion circuit, and the four-quadrant converter is composed of n electrically completely independent converter units, wherein each converter unit has a common dc bus and positive, zero, and negative dc buses.
On the basis of the above embodiments, the power module adopts a two-level H-bridge conversion circuit based on an IGBT, and is composed of a support capacitor 61, an IGBT and anti-parallel diode 62, a current sensor 63, and an output fuse 64.
Specifically, referring to fig. 5, the power module PM of the rectifying unit and the inverter conversion unit is based on an IGBT two-level H-bridge conversion structure, and mainly includes a support capacitor 61, an IGBT and anti-parallel diode 62, a current sensor 63, an output fuse 64, and the like. All positive direct current buses of the rectification power module and all negative direct current buses of the inversion power module are connected in parallel to form a common direct current unit 3, and the direct current unit comprises a supporting capacitor, a discharging circuit and the like.
As an improvement of the ground electrical isolated phase continuous power supply converter device shown in fig. 4, a Power Module (PM) of the converter device is changed into a three-level H-bridge conversion circuit, and the improved implementation manner of the ground electrical isolated phase continuous power supply converter device is shown in fig. 6, wherein positive direct current buses, zero direct current buses and negative direct current buses on the direct current sides of all the power modules are connected in parallel, and are connected in parallel, so that a common positive, zero and negative direct current bus unit 3 is formed.
In addition to the above embodiments, the three-level power module PM is a power module having a diode-clamped three-level H-bridge conversion structure based on an IGBT as shown in fig. 7, and mainly includes a support capacitor 71, a clamp diode 72, an IGBT and anti-parallel diode 73, a current sensor 74, an output fuse 75, and the like.
On the basis of the above embodiments, another circuit of the three-level power module PM is a power module based on an IGCT diode-clamped three-level H-bridge conversion structure, as shown in fig. 8, and mainly includes an absorption capacitor 81, a DC-LINK current-limiting inductor 82, a DC-LINK diode 83, a DC-LINK resistor 84, a clamping diode 85, an IGCT and anti-parallel diode 86, a current sensor 87, and an output fuse 88.
An improvement of the ground electric split-phase continuous power supply converter device shown in fig. 4 is that a converter is changed from a common direct current bus into n independent direct current buses, the device mainly comprises a single-phase multi-winding rectifier transformer T11, n independent back-to-back four-quadrant power units and a single-phase multi-winding inverter transformer T25, and each independent back-to-back four-quadrant power unit comprises a rectifier H bridge power module and an inverter H bridge power module. When the power module adopts the two-level H-bridge conversion circuit shown in fig. 5, the improved implementation of the ground electric phase separation continuous power supply converter device is shown in fig. 9, and when the power module adopts the three-level H-bridge conversion circuit shown in fig. 6 or 7, the improved implementation of the ground electric phase separation continuous power supply converter device is shown in fig. 10.
On the basis of the above embodiments, the ground electric phase separation continuous power supply converter BLQ adopts a direct high-high converter topology in which the input and output are high-voltage converters, and is composed of a pre-charging unit 11, an MMC rectifying unit 12, an intermediate direct current isolation conversion unit 13, and an MMC inversion conversion unit 14; the pre-charging unit 11 consists of a main switch QF and a pre-charging resistor R; the MMC rectifying unit 12 and the MMC inverter converting unit 14 both comprise a left bridge arm and a right bridge arm, each bridge arm consists of an upper half bridge and a lower half bridge which are symmetrical, and the upper half bridge and the lower half bridge respectively comprise a reactor 15 and n power modules 16 which are connected in series; the power module 16 is a half-bridge conversion circuit based on an IGBT power device, and is composed of an IGBT, anti-parallel diodes T1161 and T2, a discharge resistor Rd162, and a support capacitor C163.
Specifically, the device adopting the high-high conversion topology mainly comprises a rectifying unit based on Modular Multilevel (MMC) topology, a direct current isolation conversion unit and an inversion conversion unit based on Modular Multilevel (MMC) topology. The device directly connects a traction bus high-voltage power supply which is gated and fed out by a breaker of the high-voltage switch unit into the device, and carries out high-frequency rectification through the rectification unit to generate the total rectification side direct-current bus voltage. The direct current isolation conversion unit is formed by connecting a plurality of direct current isolation conversion modules in series at the direct current side, and is mainly used for electrically isolating the rectification direct current bus from the inversion direct current bus. According to the train direction and the position and the direction of the train, which are detected by the train direction and position detection unit, the inversion conversion unit is started to work timely to output a phase of voltage with a specific amplitude and a specific phase, the voltage is fed out to a neutral section of a contact network through a high-voltage circuit breaker of the high-voltage switch unit, and the neutral section is continuously supplied with power during the phase passing period of the train.
The power module 16 further includes a thyristor 164 and a bypass switch 165 connected in parallel to one side of the anti-parallel diode T2; the intermediate direct-current isolation conversion unit 13 is formed by directly connecting m direct-current isolation conversion modules DCM 17 in series at a direct-current side; wherein m is a natural number greater than 1.
For a ground electrical phase separation continuous power supply converter adopting a direct high-high conversion topology, one implementation manner is as shown in fig. 11, and mainly comprises a pre-charging unit 11, an MMC rectifying unit 12, a direct current isolation conversion unit 13, and an MMC inversion conversion unit 14. The pre-charging unit 11 is composed of a main switch QF and a pre-charging resistor R, and mainly has the functions of charging a direct current unit in the device before the device works, and closing the main switch QF after the charging is finished. The MMC rectifying unit 12 and the inverter converting unit 14 each include a left bridge arm and a right bridge arm, each of which is composed of an upper half bridge and a lower half bridge that are symmetrical, and each of the upper half bridge and the lower half bridge includes a reactor 15 and n power modules 16 that are directly connected in series. The power module 16 is a half-bridge inverter circuit based on an IGBT power device, and one embodiment is as shown in fig. 12, and mainly includes an IGBT and anti-parallel diode T1161, an IGBT and anti-parallel diode T2161, a discharge resistor Rd162, and a support capacitor C163.
For the situation that the module needs to be exited when the module fails and needs to withstand a short-time large current, an improved implementation of the power module 16 of the MMC current transforming unit is shown in fig. 13, and mainly includes devices such as an IGBT and anti-parallel diode T1161, a discharging resistor Rd162, a supporting capacitor C163, a thyristor 164, and a bypass switch 165. The intermediate dc isolation conversion unit 13 is formed by m dc isolation conversion modules DCM 17 connected in series at the dc side according to the magnitude of the total dc voltage.
Based on the above embodiments, an implementation of the DC isolation conversion module DCM 17 is as shown in fig. 14, where the DC isolation conversion module DCM 17 includes a rectification side support capacitor Cz 171, a DC-AC-DC isolation conversion unit 172, and an inversion side support capacitor Cn 173, where the DC-AC-DC isolation conversion unit 172 is a DC-DC converter including an H-bridge DC-AC converter (including T1, T2, T3, and T4 power electronic switching devices), a reactor Lr, an intermediate frequency (or high frequency) transformer Tr, and an AC-DC converter (including T5, T6, T7, and T8 power electronic switching devices).
As an improvement of the present invention, in order to prevent the intermediate frequency (or high frequency) transformer Tr from dc magnetic bias during operation, another embodiment of the dc isolation conversion module DCM 17 is shown in fig. 15, which is different from the embodiment of fig. 14 in that a dc blocking capacitor Cr is connected in series to each of the primary winding and the secondary winding of the intermediate frequency (or high frequency) transformer Tr of the dc-dc converter.
For high power applications, in order to increase the capacity of the device, as an improvement to the present invention, an improved embodiment of the dc isolation conversion module DCM 17 is shown in fig. 16, which is characterized in that the dc-ac dc isolation conversion unit 172 is formed by connecting k dc-dc converters in parallel on the dc side.
The invention also comprises a train direction and position detection unit which comprises a train position sensor and a signal processor thereof, wherein the train position sensor sends the train wheel axle signal to the signal processor for detecting the running direction and the arriving position of the train.
On the basis of the embodiment, the train direction and position detection unit comprises a sensor J1, a sensor J1 ', a sensor J2, a sensor J2', a sensor J3 and a sensor J3 ', wherein the sensor J1 and the sensor J1' are installed at two sides of a rail belonging to a α -phase traction power supply arm area, the sensor J2 and the sensor J2 'are installed at two sides of a rail belonging to a neutral section middle area, and the sensor J3 and the sensor J3' are installed at two sides of a rail belonging to a β -phase traction power supply arm area.
Preferably, the train direction and position detecting unit comprises four pairs of sensors including a sensor J1, a sensor J1 ', a sensor J21, a sensor J21 ', a sensor J21 and a sensor J21 ', wherein the sensors J21 and the sensor J21 ' are installed on two sides of a rail belonging to a region of a traction power supply arm of the 21 phase, the sensors J21 and the sensor J21 ' are installed on two sides of a rail belonging to a region of a neutral section close to a joint of the JY 21, the sensors J21 and the sensors J21 ' are installed on two sides of a rail belonging to a region of a traction power supply arm of the 21 phase, the sensors J21 ', the sensors J21 and the sensors J21 ' are adopted as the detecting units when the train runs in the forward direction, the sensors J21 ' and the sensors J21 ' are adopted as the sensors 21 ' for detecting units when the train runs in the reverse direction.
Specifically, the embodiment of the present invention further provides a train direction and position detecting unit, which includes a train position sensor and a signal processor thereof, wherein the train position sensor sends a train axle signal to the signal processor for detecting a driving direction and an arrival position of a train.
The system adopts a sensor J1, a sensor J1 ', a sensor J2, a sensor J2', a sensor J3 and a sensor J3 'as detection units for detecting the driving direction and the arrival position of a train, wherein a pair of sensors J1 and J1' are arranged at two sides of a rail belonging to a α -phase power supply arm area, a pair of sensors J2 and J2 'are arranged at two sides of the rail belonging to a neutral section middle area, and a pair of sensors J3 and J3' are arranged at two sides of the rail belonging to a β -phase power supply arm area, as shown in figure 1.
The distance between the sensors J1 and J1 'and the sensors J2 and J2' is L1, the distance between the sensors J2 and J2 'and the sensors J3 and J3' is L2, and the lengths of the sensors L1 and L2 are calculated according to the maximum train running speed of the railway and the length of the train, and are generally determined by a railway design institute and the system development unit.
In order to reduce the length of the neutral section catenary, a modified embodiment of the detection unit adopts 8 sensors including a sensor J1, a sensor J1 ', a sensor J21, a sensor J21', a sensor J22, a sensor J22 ', a sensor J3 and a sensor J3', wherein a pair of sensors J1 and a pair of sensors J1 'are installed on two sides of a rail belonging to a α -phase power supply arm area, a pair of sensors J21 and a pair of sensors J21' are installed on two sides of a rail belonging to a neutral section near a JY1 joint area, a pair of sensors J22 and a pair of sensors J22 'are installed on two sides of a rail belonging to a neutral section near a JY2 joint area, and a pair of sensors J3 and a pair of sensors J3' are installed on two sides of a rail belonging to a β -phase power supply arm area.
The distance between the sensors J1 and J1 'and the sensors J21 and J21' is L1, the distance between the sensors J21 and J21 'and the sensors J22 and J22' is L2, the distance between the sensors J22 and J22 'and the sensors J3 and J3' is L3, and the lengths of the L1, the L2 and the L3 are calculated according to the highest train running speed of the railway and the length of the train, and are generally determined by a railway design institute and a system development unit.
When the train runs in the forward direction, three pairs of sensors J1, J1 ', J22, J22', J3 and J3 'are used as detection units, and when the train runs in the reverse direction, three pairs of sensors J1, J1', J21, J21 ', J3 and J3' are used as detection units.
The working principle of the ground automatic passing continuous power supply system is illustrated by a system diagram shown in fig. 1 as follows:
① assume α phase supply arm voltage
β phase supply arm voltage
Before the pantograph of the train does not reach the point A, the ground electric split-phase continuous power supply converter is in a standby state, and the voltage of a neutral section is 0.
② when the pantograph of train reaches A point (J1 position), the ground power phase-separating continuous power supply converter is started to output, and the neutral section voltage is
Before the pantograph of the train reaches the point B, the neutral section voltage is controlled to be completely synchronous with the α phase power supply arm voltage, namely Un＝Uα，ωn＝ω0，
The train is powered by α phase power supply arms.
③ when the pantograph of the train reaches the point B, the neutral section and the α phase power supply arm are connected to the grid due to the short circuit of the pantograph, the output current of the ground electric split-phase continuous power supply converter is controlled to be increased from 0 to the current actually required by the train, the current provided by the α phase power supply arm is reduced by the actual current of the train, the current conversion is completed before the pantograph of the train reaches the point C, and at the moment, the power is supplied by the α phase power supply arm and the neutral section simultaneously.
④ the pantograph of the train leaves the point C, before the train reaches the point D (position J2), the voltage on the neutral section is controlled to be synchronous with the voltage of the α phase power supply arm, and the train is powered by the neutral section powered by the ground phase continuous power supply converter.
⑤ when the pantograph of the train reaches the D point (position J2), the frequency of the output voltage of the control device is omega with β phase supply arm voltage as the control targetn＝ω0±Δω＝2π(f0. + -. Δ f) is then
The neutral section voltage phase then approaches the β phase supply arm voltage phase, i.e.
When in use
(epsilon is a set phase error range), let
ωn＝ω0The frequency and phase of the neutral section voltage can be equal to those of the β phase supply arm voltage, meanwhile, the amplitude of the neutral section voltage is properly controlled by taking the β phase voltage amplitude as a target, so that the neutral section voltage can be supplied by the α phase supply arm voltage (u) before the pantograph of the train reaches the E pointα) Synchronous smooth transition to β phase supply arm voltage (u)β) And synchronization is realized, the continuous phase change control of frequency conversion and phase shift is realized, and the train is supplied with power by a neutral section.
⑥ when the pantograph of the train reaches the point E, the current of the ground electric phase separation continuous power supply converter device is controlled to fall, the current of the β phase power supply arm naturally rises, and the converter is completed before the pantograph reaches the point F, and in the process, the neutral section and the β phase power supply arm simultaneously supply power to the train.
⑦ when the pantograph of the train leaves the F point and the train is completely leaving the G point (J3 position), the neutral section voltage is controlled to maintain complete synchronization with the β phase supply arm voltage.
⑧ when the train completely leaves the G point (J3 position), the ground electric phase separation continuous power supply converter is standby, and the neutral section voltage is restored to 0.
When the train runs in the reverse direction, the control process is just opposite to that of the forward running, the voltage of the neutral section is controlled to be converted from β phase voltage to α phase voltage synchronously according to the 8-step control principle according to the sequence that the train reaches J3, J2 and J1, and continuous power supply of the neutral section is realized.
In order to reduce the length of a neutral section overhead line system, an improved train direction and position detection embodiment is adopted, as shown in fig. 3, when a train runs in the forward direction, three pairs of sensors J1, J1 ', J22, J22 ', J3 and J3 ' are adopted as detection units, and the ground electric phase separation continuous power supply converter device is controlled according to the principle. When the train runs in the reverse direction, three pairs of sensors J1, J1 ', J21, J21 ', J3 and J3 ' are used as detection units, and the ground electric phase-splitting continuous power supply converter device is controlled according to the reverse running principle.
Finally, the method of the present application is only a preferred embodiment and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (15)
1. An electric railway ground electric phase splitting continuous power supply system is characterized by comprising:
the high-voltage switch unit is used for switching on and off high-voltage power supplies related to the α -phase traction bus, the β -phase traction bus, the α -phase traction power supply arm and the β -phase traction power supply arm;
the ground electric phase-splitting continuous power supply converter BLQ is used for carrying out AC-DC-AC energy conversion on an accessed traction bus power supply based on a high-power electronic device and supplying power to a contact network electric phase-splitting neutral section N;
the train direction and position detection unit comprises a train position sensor and a signal processor thereof, wherein the train position sensor sends a train wheel shaft signal to the signal processor for detecting the running direction and the arrival position of a train;
the high-voltage switch unit comprises three high-voltage circuit breakers QF1, QF2, QF4 and a resistance-capacitance absorber RC, wherein a feed-in bus of the circuit breaker QF1 is connected with a α -phase traction bus, a feed-in bus of the circuit breaker QF2 is connected with a β -phase traction bus, feed-out buses of the circuit breaker QF1 and the circuit breaker QF2 are connected together to form a common connection point and are connected to a high-voltage input terminal of a ground electric phase-separated continuous power supply converter BLQ, a high-voltage feed-out terminal of the ground electric phase-separated continuous power supply converter BLQ is connected to the feed-in bus of the circuit breaker QF4, a feed-out bus of the circuit breaker QF4 is connected to a neutral section N of a feed-in contact network electric phase separation, and a high-voltage terminal of the resistance-capacitance absorber RC is connected to the feed-in;
the high-voltage switch unit further comprises a breaker QF3 and an auxiliary power supply conversion device FZDY, wherein a feed-in bus of the breaker QF3 is connected with a feed-out bus of a breaker QF1 QF2, the feed-out bus of the breaker QF3 is connected to a high-voltage input terminal of a ground electrical phase separation continuous power supply converter BLQ, and the auxiliary power supply conversion device FZDY is connected to a common bus between the feed-out of the breaker QF1, the feed-out of the breaker QF2 and the feed-in of the breaker QF 3;
the ground electric phase-splitting continuous power supply converter BLQ adopts a high-low-high converter topology with a step-down transformer as input, a step-up transformer as output and a low-voltage power electronic converter in the middle, and is an AC-DC-AC electric energy converter consisting of a single-phase multi-winding rectifier transformer (1), a single-phase multi-winding inverter transformer (5) and a back-to-back four-quadrant converter, wherein the back-to-back four-quadrant converter comprises a rectifier conversion unit (2), a DC unit (3) and an inverter conversion unit (4), the rectifier conversion unit (2) and the inverter conversion unit (4) respectively comprise n power modules, each power module adopts the same H-bridge conversion circuit, a high-voltage winding AX is arranged on the primary side of the rectifier transformer (1) and connected with a feed-out bus of a circuit breaker QF3, and n low-voltage windings a1x1 for supplying power to the rectifier unit power modules of the converter are arranged on the secondary side, a2x2 to anxn, the primary side of the single-phase multi-winding inverter transformer (5) is provided with m low-voltage windings c1x1, c2x2 to cmxm which are connected with the inverter conversion unit power module of the converter, and the secondary side is provided with a high-voltage winding CX which is connected with the feed-in bus of the breaker QF 4;
wherein n and m are both natural numbers greater than 1.
2. The system of claim 1, wherein each power module employs a two-level H-bridge converter circuit, the dc side of each power module includes a positive dc bus and a negative dc bus, the positive dc buses of all power modules are connected in parallel to form a common positive dc bus, and the negative dc buses of all power modules are connected in parallel to form a common negative dc bus.
3. The system of claim 1, wherein each of the power modules employs a three-level H-bridge converter circuit, the dc side of each of the power modules includes a positive dc bus, a zero-level dc bus, and a negative dc bus, the positive dc buses of all the power modules are connected in parallel to form a common positive dc bus, the zero-level dc buses of all the power modules are connected in parallel to form a common zero-level dc bus, and the negative dc buses of all the power modules are connected in parallel to form a common negative dc bus.
4. The ground electric split-phase continuous power supply system of the electrified railway according to claim 1, wherein the power modules all adopt two-level H-bridge conversion circuits, the number m of the power modules of the inversion conversion unit is equal to the number n of the power modules of the rectification conversion unit, the back-to-back four-quadrant converter comprises n electrically completely independent back-to-back four-quadrant converter units, each back-to-back four-quadrant converter unit comprises one rectification power module and one inversion side power module, and a common direct current bus subunit is obtained by connecting the positive direct current buses and the negative direct current buses on the direct current sides of the two power modules in parallel.
5. The ground electrical split-phase continuous power supply system of the electrified railway according to claim 1, wherein the power modules all adopt three-level H-bridge conversion circuits, the number m of the power modules of the inversion conversion unit is equal to the number n of the power modules of the rectification conversion unit, the back-to-back four-quadrant converter comprises n electrically completely independent back-to-back four-quadrant converter sub-units, the back-to-back four-quadrant converter sub-unit comprises a rectification power module and an inversion side power module, a positive direct current bus, a zero direct current bus and a negative direct current bus are arranged on the direct current side of each power module, and the positive direct current buses, the zero direct current buses and the negative direct current buses on the direct current sides of the two power modules are connected in parallel to obtain a common direct current bus sub-unit.
6. The ground electric phase-splitting continuous power supply system of the electrified railway according to claim 1 or 2, characterized in that each power module adopts an IGBT-based two-level H-bridge conversion circuit which mainly comprises a support capacitor (61), an IGBT and an anti-parallel diode (62), a current sensor (63) and an output fuse (64).
7. The ground electric phase-splitting continuous power supply system of the electrified railway according to claim 1 or 3, characterized in that each power module adopts an IGBT-based three-level H-bridge conversion circuit which mainly comprises a support capacitor (71), a clamping diode (72), an IGBT and anti-parallel diode (73), a current sensor (74) and an output fuse (75).
8. The system of claim 1 or 3, wherein the power module adopts a three-level H-bridge conversion circuit based on IGCT diode clamping type, and comprises an absorption capacitor (81), a DC-LINK LINK current-limiting inductor (82), a DC-LINK LINK diode (83), a DC-LINK LINK resistor (84), a clamping diode (85), an IGCT and anti-parallel diode (86), a current sensor (87) and an output fuse (88).
9. The system of claim 1, wherein the ground electric split-phase continuous power supply converter BLQ is a direct high-high converter topology with high voltage converters as input and output, and comprises a pre-charging unit (11), an MMC rectifying unit (12), an intermediate dc isolation conversion unit (13) and an MMC inversion conversion unit (14); the pre-charging unit (11) consists of a main switch QF and a pre-charging resistor R; the MMC rectifying unit (12) and the MMC inversion conversion unit (14) respectively comprise a left bridge arm and a right bridge arm, each bridge arm consists of an upper half bridge and a lower half bridge which are symmetrical, and the upper half bridge and the lower half bridge respectively comprise an electric reactor (15) and n power modules (16) which are connected in series; the power module (16) is a half-bridge conversion circuit based on an IGBT power device and comprises an IGBT, an anti-parallel diode T1(161), a T2, a discharge resistor Rd (162) and a support capacitor C (163).
10. The electrical railway ground phase separated continuous power supply system of claim 9, wherein the power module (16) further comprises a thyristor (164) and a bypass switch (165) connected in parallel to one side of the anti-parallel diode T2; the intermediate direct-current isolation conversion unit (13) is formed by directly connecting m direct-current isolation conversion modules DCM (17) in series at the direct-current side;
wherein m is a natural number greater than 1.
11. The system of claim 10, wherein the DC isolation conversion module DCM (17) comprises a rectification side support capacitor Cz (171), a DC-AC-DC isolation conversion unit (172), and an inversion side support capacitor Cn (173), and the DC-AC-DC isolation conversion unit (172) comprises an H-bridge DC-AC converter, a reactor Lr, a transformer Tr, and an AC-DC converter.
12. The electrical railway ground phase separated continuous power supply system according to claim 11, wherein the primary winding and the secondary winding of the transformer Tr are respectively connected in series with a dc blocking capacitor Cr.
13. The electrical railway ground phase electrical split continuous power supply system of claim 11, characterized in that the dc-ac-dc isolation transformation unit (172) is composed of k dc-dc converters connected in parallel on the dc side;
wherein k is a natural number greater than 1.
14. The system of claim 1, wherein the train direction and position detecting unit comprises a sensor J1, a sensor J1 ', a sensor J2, a sensor J2', a sensor J3 and a sensor J3 ', wherein the sensor J1 and the sensor J1' are installed at both sides of a rail belonging to a α -phase traction power supply arm area, the sensor J2 and the sensor J2 'are installed at both sides of a rail belonging to a neutral section middle area, and the sensor J3 and the sensor J3' are installed at both sides of a rail belonging to a β -phase traction power supply arm area.
15. The system of claim 1, wherein the train direction and position detecting unit comprises four pairs of sensors, namely, sensor J ', sensor J and sensor J', wherein the sensors J and sensor J 'are installed on two sides of a rail belonging to the area of the phase traction power supply arm, the sensors J and sensor J' are installed on two sides of a rail belonging to the area of the neutral section near the JY joint, the sensors J and sensor J 'are installed on two sides of a rail belonging to the area of the phase traction power supply arm, three pairs of sensors, namely, sensor J', sensor J and sensor J ', and sensor J' are used as detecting units when the train runs in the forward direction, three pairs of sensors, namely, sensor J ', sensor J, and sensor J' are used as detecting units when the train runs in the reverse direction, the JY is a phase split-phase electric phase traction power supply area between the phase traction power supply arm and the split phase traction power supply arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711492572.6A CN108146297B (en) | 2017-12-30 | 2017-12-30 | Ground electricity split-phase continuous power supply system for electrified railway |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711492572.6A CN108146297B (en) | 2017-12-30 | 2017-12-30 | Ground electricity split-phase continuous power supply system for electrified railway |
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| Publication Number | Publication Date |
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| CN108909541B (en) * | 2018-08-24 | 2023-06-20 | 西南交通大学 | Power supply structure for AT of electrified railway |
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| CN109484254B (en) * | 2018-12-04 | 2021-09-14 | 武汉大学 | Power supply topological structure for passing neutral section of high-speed railway system and control method |
| CN109733252B (en) * | 2019-01-07 | 2021-02-05 | 中国铁道科学研究院集团有限公司 | Ground automatic neutral section passing circuit and control method, control device and control system thereof |
| CN109532570B (en) * | 2019-01-09 | 2023-04-28 | 西南交通大学 | Three-phase power supply control system of short stator train |
| CN112172618B (en) * | 2020-09-28 | 2022-06-07 | 郑州铁路职业技术学院 | High-reliability power supply method for electric locomotive |
| CN114910699A (en) * | 2021-02-09 | 2022-08-16 | 华为数字能源技术有限公司 | Converter system, system insulation impedance detection method, device and medium |
| CN113183832B (en) * | 2021-05-18 | 2022-08-12 | 中铁二院工程集团有限责任公司 | Power balance cooperative flexible neutral section passing device for electrified railway and control method |
| CN113103928B (en) * | 2021-05-26 | 2022-12-09 | 中车株洲电力机车研究所有限公司 | Automatic passing neutral section system, wireless electric energy transmitting and receiving device |
| CN113665635B (en) * | 2021-08-21 | 2023-06-20 | 国网湖北省电力有限公司电力科学研究院 | Rail transit train operation position inversion method |
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