CN113799663B

CN113799663B - Power supply transmission system of bullet train, alternating current, direct current and alternating current traction converter and control method of alternating current, direct current and alternating current traction converter

Info

Publication number: CN113799663B
Application number: CN202111372257.6A
Authority: CN
Inventors: 李群湛; 吴波; 郭锴; 黄小红; 张伟鹏
Original assignee: Southwest Jiaotong University
Current assignee: Southwest Jiaotong University
Priority date: 2021-11-19
Filing date: 2021-11-19
Publication date: 2022-03-04
Anticipated expiration: 2041-11-19
Also published as: WO2023088302A1; JP2024540758A; CN113799663A; DE112022005530T5

Abstract

A power supply transmission system of a bullet train is divided into a three-phase power supply transmission mode and a single-phase power supply transmission mode, and the power supply capacities of the two modes are equal. Through automatic identification or cab remote control, when the ground traction power supply system is in a three-phase power supply system, the power supply transmission system of the bullet train is automatically switched to a three-phase power supply transmission mode, and when the ground traction power supply system is in a single-phase power supply system, the power supply transmission system of the bullet train is automatically switched to a single-phase power supply transmission mode. The mode switching is matched with a three-phase power supply system and a single-phase power supply system of a ground traction power supply system, so that the compatibility of the three-phase power supply transmission and the single-phase power supply transmission system of the bullet train can be conveniently and effectively realized.

Description

Power supply transmission system of bullet train, alternating current, direct current and alternating current traction converter and control method of alternating current, direct current and alternating current traction converter

Technical Field

The invention relates to the technical field of rail transit, in particular to a power supply transmission system of a bullet train, an AC-DC-AC traction converter and a control method thereof.

Background

The traction power supply of the existing rail transit such as subway, light rail and the like almost adopts a direct current 1500V system. The direct current system has the advantages of no split-phase power supply, smooth train operation and the like, but the regenerative energy accounting for about 30 to 50 percent of traction energy consumption is difficult to directly or indirectly utilize, expensive inversion or energy storage equipment needs to be additionally arranged, the hidden danger that the train is in failure of regenerative braking, turns to air braking and threatens driving safety due to the rejection of the inversion device or the energy storage device exists, the existing stray current generates electrochemical corrosion to peripheral metal pipelines, steel structures in buildings and the like, and the stray current is not thoroughly treated so far, so that the harm is wide and long-lasting.

Therefore, under the requirements of higher speed and larger transportation capacity, the rail transit of some extra large cities turns to the single-phase power frequency alternating current 25kV system of the selection main line railway, and the rail transit has the advantages of strong power supply capacity and simple system structure, and has the defects that the vehicle-mounted transformer has large weight and large volume, occupies precious space of a motor train, increases the axle load, and influences the passenger transport efficiency.

At present, single-phase power frequency alternating current power supply is mostly adopted for alternating current traction power supply represented by a main railway, but, under the condition of same power supply capacity, the three-phase generator, the motor, the transformer and the power transmission line are all more material-saving than the manufacture and construction of single-phase similar elements, and have simple structure and excellent performance, and the instantaneous value of the three-phase electric power is kept constant, the Chinese utility model patent No. ZL201721675432.8 (a three-phase traction power supply system) discloses a scheme of a ground three-phase traction power supply and a vehicle three-phase power supply system, because the proposal can only realize the ground three-phase traction power supply and the vehicle three-phase power supply system, the technical problem to be solved at present, how to realize the compatibility of vehicle-mounted three-phase power supply transmission and single-phase power supply transmission so as to more flexibly adapt to a ground traction power supply scheme and ensure that the power supply system has better applicability.

Disclosure of Invention

One of the purposes of the invention is to provide a power supply transmission system for a bullet train, which can effectively solve the compatibility of vehicle-mounted three-phase power supply transmission and single-phase power supply transmission and increase the applicability of the power supply system.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

a power supply transmission system of a bullet train supplies power through a ground traction power supply system, and comprises a three-phase power supply transmission mode and a single-phase power supply transmission mode.

The power supply transmission system of the motor car further comprises a measurement and control device CTL, when the measurement and control device CTL detects that the ground traction power supply system is in a three-phase power supply system, the measurement and control device CTL controls the power supply transmission system of the motor car to operate in a three-phase power supply transmission mode, and when the measurement and control device CTL detects that the ground traction power supply system is in a single-phase power supply system, the measurement and control device CTL controls the power supply transmission system of the motor car to operate in a single-phase power supply transmission mode.

Further, the power supply transmission system of the motor car comprises an AC-DC-AC traction converter TDS1 electrically connected with a traction motor M1, a change-over switch K for switching a power supply transmission mode, a voltage transformer PTAB, a voltage transformer PTBC and a voltage transformer PTCA which respectively detect voltages between different two phases in a three-phase power supply bus comprising a power supply bus MA, a power supply bus MB and a power supply bus MC, wherein output ends of the voltage transformer PTAB, the voltage transformer PTBC and the voltage transformer PTCA are connected with a measuring end of a measuring controller CTL, and an output end of the measuring controller CTL is connected with a control end of the AC-DC-AC traction converter TDS1 and a control end of the change-over switch K.

Further, the power supply transmission system for the motor car further comprises a current collector CA, a current collector CB, a current collector CC, a current collection cable LA0, a current collection cable LB0, a current collection cable LC0, a current collection switch KLA, a current collection switch KLB, a current collection switch KLC, a power supply bus MA, a power supply bus MB, a power supply bus MC, a power supply cable LA, a power supply cable LB, a power supply cable LC, a feed-out switch KQA1, a feed-out switch KQB1, a feed-out switch KQC1, a feed-out cable LNA1, a feed-out cable LNB1, a feed-out cable LNC1, an outlet cable MA1, an outlet cable MB1, an outlet cable MC1 and a traction motor M1, wherein:

the contact ends of the current collector CA, the current collector CB and the current collector CC are connected with a ground traction power supply system, the terminals of the current collector CA, the current collector CB and the current collector CC are respectively connected with the head ends of a current collecting cable LA0, a current collecting cable LB0 and a current collecting cable LC0, the tail ends of the current collecting cable LA0, the current collecting cable LB0 and the current collecting cable LC0 are respectively connected with the power supply bus MA, the power supply bus MB and the power supply bus MC through a current collecting switch KLA, a current collecting switch KLB and a current collecting switch KLC, the head ends of the power supply bus MA, the power supply bus MB and the power supply bus MC are respectively connected with the power supply cable LA, the power supply cable LB and the power supply cable LC, the head ends of a feed-out cable LNA1, a feed-out cable 685B 1 and a feed-out cable LNC1 are respectively connected with the input ends of the power supply cable LA, the power supply cable LB and the power supply cable LC through a feed-out switch KQB1, a feed-out switch KQB1, a feed-out switch KQC1 and a feed-out cable TDS1 are respectively connected with the input end of a direct current transformer 1, the output end of the alternating current-direct current-alternating current traction converter TDS1 is connected with a traction motor M1 through an outgoing cable MA1, an outgoing cable MB1 and an outgoing cable MC 1;

change over switch K connect in parallel between power supply bus MA and power supply bus MB, voltage transformer PTAB set up in between power supply bus MA, the power supply bus MB, voltage transformer PTBC set up in between power supply bus MB, the power supply bus MC, voltage transformer PTCA set up in between power supply bus MC, the power supply bus MA.

Furthermore, the ground traction power supply system is provided with a power supply mechanism TA and a power supply mechanism TB, contact ends of the current collector CA and the current collector CB are respectively contacted with the power supply mechanism TA and the power supply mechanism TB of the ground traction power supply system to receive power, and a contact end of the current collector CC is contacted with the steel rail R to receive power.

Further, the power supply transmission system of the motor train comprises n groups of AC-DC-AC traction converters and n traction motors, wherein the n groups of AC-DC-AC traction converters are recorded as an AC-DC-AC traction converter TDS1, AC-DC-AC traction converters TDS2, …, AC-DC-AC traction converters TDSi, …, an AC-DC-AC traction converter TDSn, the n traction motors are recorded as traction motors M1, traction motors M2, …, traction motors Mi, … and traction motor Mn; the power supply cable LA, the power supply cable LB and the power supply cable LC are respectively connected with the head ends of the feed-out cable LNAi, the feed-out cable LNBi and the feed-out cable LNCi through a feed-out switch KQAI, a feed-out switch KQBI and a feed-out switch KQCi, the tail ends of the feed-out cable LNAi, the feed-out cable LNBi and the feed-out cable LNCi are connected with the input end of the AC-DC-AC traction converter TDSi, the output end of the AC-DC-AC traction converter TDSi is connected with the traction motor Mi through an outgoing cable MAi, an outgoing cable MBi and an outgoing cable MCi, and i =1, 2.,

the second objective of the present invention is to provide a control method for the power supply transmission system of the motor vehicle, comprising:

step A: b, judging whether the power supply system of the ground traction power supply system is a three-phase power supply system or a single-phase power supply system, if the power supply system of the traction power supply system is the three-phase power supply system, performing step B, and if the power supply system of the traction power supply system is the single-phase power supply system, performing step C;

and B: controlling the power supply transmission system of the motor car to operate in a three-phase power supply transmission mode;

and C: and controlling the power supply transmission system of the motor car to operate in a single-phase power supply transmission mode.

Further, the step a is further: the measurement and control device CTL of the power supply transmission system of the motor train respectively obtains voltage values measured by the voltage transformer PTAB, the voltage transformer PTBC and the voltage transformer PTCA, if the voltage values measured by the voltage transformer PTAB, the voltage transformer PTBC and the voltage transformer PTCA are equal, the power supply system of the ground traction power supply system is judged to be a three-phase power supply system, and then the step B is carried out; and if two voltage values in the three voltage values measured by the voltage transformer PTAB, the voltage transformer PTBC and the voltage transformer PTCA are added to be equal to the third voltage value, judging that the power supply system of the ground traction power supply system is a single-phase power supply system, and then performing the step C.

Further, the power supply transmission system of the motor car comprises a change-over switch K for switching the power supply transmission mode, and the step B is further as follows: the measurement and control device CTL controls the change-over switch K to be switched off, and controls the input end of an alternating current-direct current-alternating current traction converter TDS1 in a power supply transmission system of the motor car to operate according to a three-phase rectification circuit; the step C is further as follows: and the measurement and control device CTL controls the change-over switch K to be closed and controls the input end of the alternating-current, direct-current and alternating-current traction converter TDS1 to operate according to a single-phase rectification circuit.

The invention further aims to provide an AC-DC-AC traction converter for the power supply transmission system of the motor car.

The AC-DC-AC traction converter comprises an input end inductor INA1, an inductor INB1, an inductor INC1, an input end power tube bridge arm LBA1, a power tube bridge arm LBB1, a power tube bridge arm LBC1, a bus capacitor BUSC1, an output end power tube bridge arm MBA1, a power tube bridge arm MBB1 and a power tube bridge arm MBC 1; an input end power tube bridge arm LBA1, a power tube bridge arm LBB1, a power tube bridge arm LBC1, a BUS capacitor BUSC1, an output end power tube bridge arm MBA1, a power tube bridge arm MBB1 and a power tube bridge arm MBC1 are connected in parallel between an anode direct current BUS BUS + and a cathode direct current BUS BUS-; one end of an input end inductor INA1, one end of an inductor INB1 and one end of an inductor INC1 serve as the input end of an AC-DC-AC traction converter, the other end of the input end inductor INA1, the inductor INB1 and the inductor INC1 are respectively connected with an input end power tube bridge arm LBA1, a power tube bridge arm LBB1 and a power tube bridge arm LBC1, and three-phase output ends led out from an output end power tube bridge arm MBA1, a power tube bridge arm MBB1 and a power tube bridge arm MBC1 are connected with the input end of a traction motor M1 through an outgoing line cable MA1, an outgoing line cable MB1 and an outgoing line cable MC 1.

Furthermore, all devices and cables in the power supply transmission system of the motor train unit are insulated according to rated voltage Ue =3000V, and the rated value of the direct-current voltage between the positive direct-current BUS BUS + and the negative direct-current BUS BUS-of the alternating-current direct-current and alternating-current traction converter is the highest value on the premise that the rated value is smaller than the direct-current withstand voltage of the power tube bridge arm and enough safety margin is reserved.

Further, an input end power tube bridge arm LBA1, a power tube bridge arm LBB1, a power tube bridge arm LBC1, an output end power tube bridge arm MBA1, a power tube bridge arm MBB1 and a power tube bridge arm MBC1 of the AC-DC-AC traction converter TDS1 are all I-type three-level circuits.

Furthermore, the power supply capacity in the three-phase power supply transmission mode is equal to the power supply capacity in the single-phase power supply transmission mode, the rated current of a power supply cable LA in the power supply transmission system of the motor car is I, the rated current of a power supply cable LB is I, the rated current of a power supply cable LC is 1.732I, the rated current of an input end power tube bridge arm LBC1 of the ac-dc-ac traction converter TDS1 is =1.732 times, and the rated current of a power tube bridge arm LBA1 is =1.732 times of the rated current of a power tube bridge arm LBB 1.

The fourth purpose of the present invention is to provide a control method for an ac, dc, ac and ac traction converter of a power supply transmission system of a bullet train, wherein the rated voltage of the ac, dc, ac and ac traction converter is recorded as Ue, the rated power of a traction motor is recorded as Pe, and under a traction condition, the method comprises:

when the voltage of the input end of the AC-DC-AC traction converter is between 0.8Ue and 1.1Ue, the AC-DC-AC traction converter controls the traction motor to output rated power Pe;

when the voltage of the input end of the AC-DC-AC traction converter is between 0.8Ue and 0.7Ue, the AC-DC-AC traction converter controls the output power of the traction motor to be linearly reduced from Pe to 0.8 Pe;

when the voltage of the input end of the AC-DC-AC traction converter is between 0.7Ue and 0.6Ue, the AC-DC-AC traction converter controls the output power of the traction motor to be linearly reduced to 0 from 0.8 Pe;

when the voltage of the input end of the AC-DC-AC traction converter is between 1.1Ue and 1.15Ue, the AC-DC-AC traction converter controls the output power of the traction motor to be linearly reduced from Pe to 0;

when the ground traction power supply system is designed, the minimum voltage value of the input end of the alternating current-direct current-alternating current traction converter TDS1 is not less than 1.1 times of 0.6Ue, and the maximum voltage value is not more than 0.9 times of 1.2 Ue.

Further, under the regeneration working condition, the method comprises the following steps:

when the voltage of the input end of the AC-DC-AC traction converter is between 0.8Ue and 1.1Ue, the AC-DC-AC traction converter controls the regenerative power of a traction motor to be Pe;

when the voltage of the input end of the AC-DC-AC traction converter is between 0.8Ue and 0.7Ue, the AC-DC-AC traction converter controls the regenerative power of the traction motor to be linearly reduced from Pe to 0.8 Pe;

when the voltage of the input end of the AC-DC-AC traction converter is between 0.7Ue and 0.6Ue, the AC-DC-AC traction converter controls the regenerative power of the traction motor to be linearly reduced to 0 from 0.8 Pe;

when the voltage of the input end of the AC-DC-AC traction converter is between 1.1Ue and 1.2Ue, the AC-DC-AC traction converter controls the regenerative power of the traction motor to be linearly reduced from Pe to 0.

The working principle of the invention is as follows:

two of the three-phase power supply buses (power supply bus MA, power supply bus MB and power supply bus MC) are connected in parallel to form a single-phase loop with the third bus, and the two parallel buses are separated to restore the three-phase loop with the third bus, wherein the process can be realized by a bypass change-over switch (change-over switch K); the capacity setting of the power supply cable and the power tube of the AC/DC/AC traction converter can simultaneously meet two modes, namely a three-phase power supply transmission mode and a single-phase power supply transmission mode, on the premise that the power supply capacities of the two modes are equal, the utilization rate of the power supply cable can be optimal, and on the premise that the transmission capacities of the two modes are equal, the capacity utilization rate of the power tube of the AC/DC/AC traction converter can be optimal; according to the numerical value relationship of the line voltages between every two three-phase power supply buses, whether a ground traction power supply system supplying power to the three-phase power supply buses is a three-phase power supply system or a single-phase power supply system can be judged, and therefore the change-over switch is controlled to automatically switch between a vehicle-mounted three-phase power supply transmission mode and a single-phase power supply transmission mode.

Compared with the prior art, the invention has the beneficial effects that:

the power supply transmission system of the bullet train can be suitable for a ground three-phase traction power supply system or a ground single-phase traction power supply system, and can be automatically suitable for flexible conversion between different power supply systems of the two systems; the invention utilizes the dual advantages of strong three-phase power supply capability and simple single-phase power supply to realize the compatibility of the transmission system of the motor car to single-phase and three-phase power supply modes, so that the design of a power supply scheme is more flexible, and the application occasions of lines are greatly expanded;

secondly, on the premise of equal power supply capacity, rated capacity of a three-phase mode and rated capacity of a single-phase mode are set, so that capacity utilization rates of a power supply cable and a power tube of the AC-DC-AC traction converter can be optimal;

3000V belongs to the national standard voltage grade, so that the power supply transmission voltage of the locomotive is matched with the national standard voltage grade, the cost of related equipment and electric appliances can be greatly reduced, and the reliability is improved;

compared with the existing bullet train transmission system, the system cancels a vehicle-mounted traction transformer, so that the AC-DC-AC traction converter directly gets electricity from a power supply bus, the axle weight of the bullet train is greatly reduced, the effective carrying space of the bullet train is improved, the operation energy consumption is saved, and the operation benefit is improved;

the invention can be used for a main railway, and can also be used for urban rails and urban railways;

and on the premise that the power supply capacities of the systems are equal, the vehicle-mounted three-phase power supply transmission mode or the single-phase power supply transmission mode is switched to be respectively matched with a three-phase power supply system or a single-phase power supply system of the ground traction power supply system, so that the compatibility of the three-phase power supply transmission and the single-phase power supply transmission system of the motor car can be conveniently and effectively realized, and the mode switching is simple, the technology is reliable, the performance is excellent, and the implementation is convenient.

Drawings

FIG. 1 is a schematic diagram of the basic structure of the present invention.

Fig. 2 is a schematic diagram of an expanded structure according to an embodiment of the present invention.

FIG. 3 is a control flow chart of the present invention.

Fig. 4 is a schematic structural diagram of an ac-dc-ac traction converter according to the present invention.

Fig. 5 is a schematic diagram of the traction control of the present invention.

Fig. 6 is a schematic diagram of the braking control of the present invention.

Detailed Description

In order to better understand the inventive idea of the present invention, the working principle of the present invention is further illustrated by the following embodiments respectively:

example one

The embodiment provides a power supply transmission system for a bullet train, which supplies power through a ground traction power supply system, wherein the power supply transmission system for the bullet train comprises a three-phase power supply transmission mode and a single-phase power supply transmission mode, when the ground traction power supply system is in a three-phase power supply system, the power supply transmission system for the bullet train operates in the three-phase power supply transmission mode, and when the ground traction power supply system is in the single-phase power supply system, the power supply transmission system for the bullet train operates in the single-phase power supply transmission mode.

In this case, considering that the ground traction power supply system has two modes of three-phase power supply and single-phase power supply, the power supply transmission system for the bullet train provided by this embodiment includes a three-phase power supply transmission mode and a single-phase power supply transmission mode, and selects an operating mode of the power supply transmission system for the bullet train according to the power supply mode of the ground traction power supply system, so that the power supply transmission system for the bullet train matches with the ground traction power supply system. In addition, when the power supply transmission mode is switched, the switching can be automatically detected, and the switching can also be manually switched (for example, the change-over switch K is manually closed or opened).

On the technical purpose that the power supply transmission system of the motor car can operate in a three-phase power supply transmission mode and a single-phase power supply transmission mode, the switching between different power supply transmission modes can be realized through a preferred mode provided later in the embodiment, or two independent transmission systems (the three-phase power supply transmission system and the single-phase power supply transmission system) can be adopted, and the embodiment does not introduce the situation of adopting the two independent transmission systems at all in consideration of economic cost and load.

Preferably, the present embodiment further includes a measurement and control device CTL, wherein when the measurement and control device CTL detects that the ground traction power supply system is in a three-phase power supply system, the measurement and control device CTL controls the power supply transmission system of the bullet train to operate in a three-phase power supply transmission mode, and when the measurement and control device CTL detects that the ground traction power supply system is in a single-phase power supply system, the measurement and control device CTL controls the power supply transmission system of the bullet train to operate in the three-phase power supply transmission mode.

Preferably, as shown in fig. 1, the present embodiment includes an ac/dc/ac traction converter TDS1 electrically connected to the traction motor M1, a transfer switch K for switching a power supply transmission mode, and a voltage transformer PTAB, a voltage transformer PTBC, and a voltage transformer PTCA for respectively detecting voltages between different two phases in a three-phase power supply bus, which is a power supply bus MA, a power supply bus MB, and a power supply bus MC, wherein output ends of the voltage transformer PTAB, the voltage transformer PTBC, and the voltage transformer PTCA are connected to a measurement end of the measurement controller CTL, and an output end of the measurement controller CTL is connected to a control end of the ac/dc/ac traction converter TDS1 and a control end of the transfer switch K. The function of the change-over switch K is mainly used for switching the power supply transmission mode.

Here, the three-phase power supply bus refers to a power supply bus MA, a power supply bus MB, and a power supply bus MC, which are described later in this embodiment, and the three-phase power supply bus takes power from the ground traction power supply system and supplies the power to the ac-dc-ac traction converter TDS 1.

Preferably, as shown in fig. 1, this embodiment further includes a current collector CA, a current collector CB, a current collector CC, a current collection cable LA0, a current collection cable LB0, a current collection cable LC0, a current collection switch KLA, a current collection switch KLB, a current collection switch KLC, a power supply bus MA, a power supply bus MB, a power supply bus MC, a power supply cable LA, a power supply cable LB, a power supply cable LC, a feed-out switch KQA1, a feed-out switch KQB1, a feed-out switch KQC1, a feed-out cable LNA1, a feed-out cable LNB1, a feed-out cable LNC1, and an outlet cable MA1, an outlet cable MB1, an outlet cable MC1, and a traction motor M1, wherein:

Preferably, the ground traction power supply system is provided with a power supply mechanism TA and a power supply mechanism TB, contact ends of the current collector CA and the current collector CB are respectively contacted with the power supply mechanism TA and the power supply mechanism TB of the ground traction power supply system to receive power, and a contact end of the current collector CC is contacted with the steel rail R to receive power.

Here, the ground traction power supply system may include a power supply mechanism TA and a power supply mechanism TB, and may further include a grounded steel rail R, the power supply bus MA and the power supply bus MB of the power train unit power supply transmission system may respectively take power from the power supply mechanism TA and the power supply mechanism TB, the power supply bus MC is electrically connected to the steel rail R, when the power supply mechanism TA, the power supply mechanism TB and the steel rail R of the ground traction power supply system form three-phase power supply, the change-over switch K1 in this embodiment is turned off, and when the power supply mechanism TA or the power supply mechanism TB alone supplies power, the power supply mechanism TA or the power supply mechanism TB forms single-phase power supply with the steel rail R, the change-over switch K in this embodiment is turned on.

In this embodiment, the ends of the current collectors CA and CB that contact the power supply mechanisms TA and TB are contact terminals, the ends that connect the current collection cables LA0 and LB0 are terminals, the end of the current collector CC that contacts the steel rail R is a contact terminal, and the end that connects the current collection cable LC0 is a terminal.

Preferably, as shown in fig. 2, the present embodiment may include n sets of ac, dc, ac, and ac traction converters and n traction motors, where the n sets of ac, dc, and ac traction converters are denoted as ac, dc, and ac traction converter TDS1, ac, dc, and ac traction converters TDS2, …, ac, dc, and ac traction converters TDSi, …, and ac, dc, and ac traction converter TDSn; the n traction motors are marked as traction motors M1, traction motors M2, …, traction motors Mi, … and traction motor Mn; the power supply cable LA, the power supply cable LB and the power supply cable LC are respectively connected with the head ends of the feed-out cable LNAi, the feed-out cable LNBi and the feed-out cable LNCi through a feed-out switch KQAI, a feed-out switch KQBI and a feed-out switch KQCi, the tail ends of the feed-out cable LNAi, the feed-out cable LNBi and the feed-out cable LNCi are connected with the input end of the AC-DC-AC traction converter TDSi, and i =1, 2.

Example 2

As shown in fig. 3, the present embodiment provides a process for controlling a method of powering a motor vehicle transmission system according to embodiment 1, including:

The step A is further as follows: and the measurement and control device CTL of the power supply transmission system of the motor car respectively obtains voltage values measured by the voltage transformer PTAB, the voltage transformer PTBC and the voltage transformer PTCA, if the voltage values measured by the voltage transformer PTAB, the voltage transformer PTBC and the voltage transformer PTCA are equal, the power supply system of the ground traction power supply system is judged to be a three-phase power supply system, then the step B is carried out, if two voltage values in the three voltage values measured by the voltage transformer PTAB, the voltage transformer PTBC and the voltage transformer PTCA are added to be equal to a third voltage value, the power supply system of the ground traction power supply system is judged to be a single-phase power supply system, and then the step C is carried out.

Preferably, the power supply transmission system of the motor car comprises a change-over switch K for switching the power supply transmission mode, and the step B further comprises: the measurement and control device CTL controls the change-over switch K to be switched off, and controls the input end of an alternating current-direct current-alternating current traction converter TDS1 in a power supply transmission system of the motor car to operate according to a three-phase rectification circuit; the step C is further as follows: and the measurement and control device CTL controls the change-over switch K to be closed and controls the input end of the alternating-current, direct-current and alternating-current traction converter TDS1 to operate according to a single-phase rectification circuit.

It should be noted that the changeover switch K may be automatically controlled by the measurement and control device CTL or may be remotely controlled by the driver in the cab.

Here, considering that the ground traction power supply system has two systems of three-phase power supply and single-phase power supply, the control method for the power supply transmission system of the bullet train provided by the embodiment may determine the power supply system of the ground traction power supply system first, and then control the working mode of the power supply transmission system of the bullet train, so that the power supply transmission system of the bullet train is matched with the ground traction power supply system.

Example 3

As shown in fig. 4, the present embodiment provides an ac-dc-ac traction converter for a power train system provided in embodiment 1, including an input end inductor INA1, an inductor INB1, an inductor INC1, an input end power tube bridge arm LBA1, a power tube bridge arm LBB1, a power tube bridge arm LBC1, a bus capacitor BUSC1, an output end power tube bridge arm MBA1, a power tube bridge arm MBB1, and a power tube bridge arm MBC 1; an input end power tube bridge arm LBA1, a power tube bridge arm LBB1, a power tube bridge arm LBC1, a BUS capacitor BUSC1, an output end power tube bridge arm MBA1, a power tube bridge arm MBB1 and a power tube bridge arm MBC1 are connected in parallel between an anode direct current BUS BUS + and a cathode direct current BUS BUS-; one end of an input end inductor INA1, one end of an inductor INB1 and one end of an inductor INC1 serve as the input end of an AC-DC-AC traction converter, the other end of the input end inductor INA1, the inductor INB1 and the inductor INC1 are respectively connected with an input end power tube bridge arm LBA1, a power tube bridge arm LBB1 and a power tube bridge arm LBC1, and three-phase output ends led out from an output end power tube bridge arm MBA1, a power tube bridge arm MBB1 and a power tube bridge arm MBC1 are connected with the input end of a traction motor M1 through an outgoing line cable MA1, an outgoing line cable MB1 and an outgoing line cable MC 1.

The embodiment provides the selection of the rated voltage for the power supply transmission system of the bullet train, preferably, all devices and cables in the power supply transmission system of the bullet train are designed in an insulating mode according to the rated voltage Ue =3000V, and the rated value of the direct current voltage between the positive direct current BUS + and the negative direct current BUS-of the alternating current-direct current-alternating current traction converter is the highest value on the premise that the rated value is smaller than the direct current withstand voltage of the bridge arm of the power tube and a sufficient safety margin is reserved.

Preferably, the input power tube bridge arm LBA1, the power tube bridge arm LBB1, the power tube bridge arm LBC1, the output power tube bridge arm MBA1, the power tube bridge arm MBB1 and the power tube bridge arm MBC1 of the ac-dc-ac traction converter TDS1 are all I-type three-level circuits. Here, the ac-dc-ac traction converter TDS1 adopts a three-phase back-to-back converter of an I-type three-level circuit, which can be applied to a three-phase power supply transmission system on one hand, and can also increase the converter voltage class to meet the requirement of 3000V input voltage on the other hand, which is an optimal circuit scheme selected according to the input voltage class of 3000V.

The embodiment also provides a power supply cable rated current selection method and a power tube bridge arm rated current selection method of the AC-DC-AC traction converter. Preferably, the power supply capacity in the three-phase power supply transmission mode is equal to the power supply capacity in the single-phase power supply transmission mode, the rated current of a power supply cable LA in the power supply transmission system of the motor vehicle is I, the rated current of a power supply cable LB is I, the rated current of a power supply cable LC is 1.732I, and the rated current of an input power tube bridge arm LBC1 of the ac-dc-ac traction converter TDS1 =1.732 times the rated current of a power tube bridge arm LBA1 =1.732 times the rated current of a power tube bridge arm LBB 1. By setting the rated capacity configuration, the capacity utilization rate of the AC/DC/AC traction converter TDS1 can be optimized.

Example 4

The present embodiment provides a control method for controlling an ac-dc-ac traction converter of a power transmission system of a motor vehicle provided in embodiment 1, where a rated voltage of the ac-dc-ac traction converter is denoted as Ue, a rated power of a traction motor is denoted as Pe, and as shown in fig. 5, in a traction condition, the method includes:

As shown in FIG. 6, under regeneration conditions, the method includes:

The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.

Claims

1. a motor vehicle power supply transmission system, powered by ground traction power supply system, it is characterized in that: described motor vehicle power supply transmission system comprises three-phase power supply transmission mode and single-phase power supply transmission mode, when described ground traction power supply system is three-phase power supply When the electric vehicle power supply system is in the three-phase power supply transmission mode, when the ground traction power supply system is in the single-phase power supply system, the electric vehicle power supply transmission system operates in the single-phase power supply transmission mode; it includes a measurement and control device CTL, When the measurement controller CTL detects that the ground traction power supply system is a three-phase power supply system, the measurement controller CTL controls the motor vehicle power supply transmission system to operate in the three-phase power supply transmission mode. When the measurement controller CTL detects that the ground traction power supply is used When the system is a single-phase power supply system, the measurement and control device CTL controls the motor vehicle power supply transmission system to operate in a single-phase power supply transmission mode; it also includes a switch K for switching the power supply transmission mode, and the switch K is connected in parallel with two power supply buses In between, two of the three-phase power supply buses are connected in parallel with the third to form a single-phase loop.

2. A kind of electric vehicle power supply transmission system according to claim 1, is characterized in that, also comprises the AC-DC-AC traction converter TDS1 electrically connected with the traction motor M1, respectively detects the voltage between different two phases in the three-phase power supply bus. voltage transformer PTAB, voltage transformer PTBC and voltage transformer PTCA, the output terminals of the voltage transformer PTAB, voltage transformer PTBC and voltage transformer PTCA are connected with the measurement terminal of the measurement and control device CTL, the measurement and control device CTL The output end of the AC-DC-AC traction converter TDS1 is connected to the control end of the transfer switch K.

3. a kind of motor vehicle power supply transmission system according to claim 2 is characterized in that: also comprises collector CA, collector CB, collector CC, collector cable LA0, collector cable LB0, collector cable LC0, collector Electric switch KLA, collector switch KLB, collector switch KLC, power supply cable LA, power supply cable LB, power supply cable LC, outgoing switch KQA1, outgoing switch KQB1, outgoing switch KQC1, outgoing cable LNA1, outgoing cable LNB1 , outgoing cable LNC1, and outgoing cable MA1, outgoing cable MB1, outgoing cable MC1, and traction motor M1, the three-phase power supply bus is power supply bus MA, power supply bus MB, and power supply bus MC, wherein:

The contact ends of the collector CA, the collector CB, and the collector CC are connected to the ground traction power supply system, and the terminals of the collector CA, the collector CB, and the collector CC are respectively connected with the collector cable LA0, the collector cable LB0, and the collector cable. The head end of the power cable LC0 is connected, and the ends of the power collecting cable LA0, the power collecting cable LB0, and the power collecting cable LC0 are respectively connected to the power supply bus MA, the power supply bus MB, and the power supply busbar MA, the power supply busbar MB, and the power supply busbar MA, the power supply busbar MB, and the power supply switch KLA, the power collector switch KLB, and the power collector switch KLC. The busbar MC is connected, and the power supply busbar MA, the power supply busbar MB, and the power supply busbar MC are also respectively connected with the power supply cable LA, the power supply cable LB, and the power supply cable LC. The feed-out switch KQA1, the feed-out switch KQB1, and the feed-out switch KQC1 are connected to the power supply cable LA, the power supply cable LB, and the power supply cable LC. The input end of the AC-DC traction converter TDS1 is connected with the traction motor M1 through the outgoing cable MA1, the outgoing cable MB1 and the outgoing cable MC1;

The transfer switch K is connected in parallel between the power supply bus MA and the power supply bus MB, the voltage transformer PTAB is arranged between the power supply bus MA and the power supply bus MB, and the voltage transformer PTBC is arranged on the power supply Between the busbar MB and the power supply busbar MC, the voltage transformer PTCA is arranged between the power supply busbar MC and the power supply busbar MA.

4. A motor vehicle power supply transmission system according to claim 3, characterized in that: the ground traction power supply system is provided with a power supply mechanism TA and a power supply mechanism TB, and the contact ends of the current collector CA and the current collector CB are respectively connected to The power supply mechanism TA of the ground traction power supply system is in contact with the power supply mechanism TB to receive electricity, and the contact end of the collector CC is in contact with the rail R to receive electricity.

5. A motor vehicle power supply transmission system according to claim 3, characterized in that: it comprises n groups of AC-DC-AC traction converters and n traction motors, and the n groups of AC-DC-AC traction converters are denoted as AC-DC-AC traction converters TDS1, AC/DC traction converter TDS2, …, AC/DC traction converter TDSi, …, AC/DC traction converter TDSn; n traction motors are denoted as traction motor M1, traction motor M2, …, traction motor Mi , ..., the traction motor Mn; wherein, the power supply cable LA, the power supply cable LB, and the power supply cable LC pass through the feed-out switch KQAi, the feed-out switch KQBi, the feed-out switch KQCi and the feed-out cable LNAi, the feed-out cable LNBi, and the feed-out cable respectively. The head end of the LNCi is connected, and the feed-out cable LNAi, the feed-out cable LNBi, and the end of the feed-out cable LNCi are connected to the input end of the AC-DC-AC traction converter TDSi. The outgoing cable MBi and the outgoing cable MCi are connected to the traction motor Mi, i=1,2,...,n.

6. A control method for an electric motor vehicle power supply transmission system according to any one of claims 2, 3, and 5, characterized in that: comprising:

Step A: The measurement controller CTL determines whether the power supply system of the ground traction power supply system is a three-phase power supply system or a single-phase power supply system. If the power supply system of the traction power supply system is a three-phase power supply system, go to step B. If the power supply system of the traction power supply system is For single-phase power supply, go to step C;

Step B: The measuring and controlling device CTL controls the electric vehicle power supply transmission system to operate in the three-phase power supply transmission mode;

Step C: The measuring and controlling device CTL controls the electric vehicle power supply transmission system to operate in the single-phase power supply transmission mode.

7 . The method for controlling a power-supply transmission system for an electric train according to claim 6 , wherein the step A is further: the measurement and control device CTL of the power-supply transmission system for the electric train obtains the voltage transformer PTAB, the voltage Voltage values measured by transformer PTBC and voltage transformer PTCA,

If the voltage values measured by the voltage transformer PTAB, the voltage transformer PTBC, and the voltage transformer PTCA are equal, it is determined that the power supply system of the ground traction power supply system is a three-phase power supply system, and then step B is performed; if the voltage transformer PTAB, the voltage transformer If the sum of two of the three voltage values measured by PTBC and PTCA is equal to the third voltage value, it is determined that the power supply system of the ground traction power supply system is a single-phase power supply system, and then step C is performed.

8 . The method for controlling a power supply transmission system for an electric vehicle according to claim 7 , wherein the electric vehicle power supply transmission system comprises a switch K for switching the power supply transmission mode, and the step B further comprises: the measurement and control device. 9 . The CTL controls the transfer switch K to be turned off, and controls the input end of the AC, DC, and AC traction converter TDS1 in the electric train power supply drive system to operate as a three-phase rectifier circuit; the step C further includes: the measurement and control device CTL controls the transfer switch K to close, and controls The input end of AC-DC-AC traction converter TDS1 operates as a single-phase rectifier circuit.

9. An AC-DC-AC traction converter used in the power supply transmission system of any one of claims 2, 3, and 5, characterized in that it comprises an input end inductance INA1, an inductance INB1, an inductance INC1, an input end power tube Bridge arm LBA1, power tube arm LBB1, power tube arm LBC1, bus capacitor BUSC1, output power tube arm MBA1, power tube arm MBB1, power tube arm MBC1; input power tube arm LBA1, power tube The bridge arm LBB1, the power tube bridge arm LBC1, the bus capacitor BUSC1, the output end power tube bridge arm MBA1, the power tube bridge arm MBB1, and the power tube bridge arm MBC1 are connected in parallel between the positive DC bus BUS+ and the negative DC bus BUS-; input One end of the terminal inductance INA1, the inductance INB1 and the inductance INC1 is used as the input end of the AC, DC and AC traction converter, and the other end is connected to the power tube bridge arm LBA1, the power tube bridge arm LBB1 and the power tube bridge arm LBC1 of the input end respectively. The three-phase output terminals drawn from the tube bridge arm MBA1, the power tube bridge arm MBB1, and the power tube bridge arm MBC1 are connected to the input end of the traction motor M1 through the outgoing cable MA1, the outgoing cable MB1, and the outgoing cable MC1;

The power supply capacity in the three-phase power transmission mode is equal to that in the single-phase power transmission mode. The rated current of the power supply cable LA in the EMU power supply transmission system is I, the rated current of the power supply cable LB is I, and the rated current of the power supply cable LC is I. is 1.732I, the rated current of the power tube bridge arm LBC1 at the input end of the AC-DC-AC traction converter TDS1=1.732 times the rated current of the power tube bridge arm LBA1=1.732 times the rated current of the power tube bridge arm LBB1.

10. A method for controlling the AC, DC, and AC traction converters of the motor vehicle power supply drive system according to any one of claims 2, 3, and 5, wherein the rated voltage of the AC, DC, and AC traction converters is denoted as Ue, and the rated voltage of the traction motor is Ue. The power is denoted as Pe, and under the traction condition, the method includes:

When the input voltage of the AC-DC-AC traction converter is between 0.8Ue and 1.1Ue, the AC-DC-AC traction converter controls the output rated power Pe of the traction motor;

When the input voltage of the AC-DC-AC traction converter is between 0.8Ue and 0.7Ue, the AC-DC-AC traction converter controls the output power of the traction motor to drop linearly from Pe to 0.8Pe;

When the input voltage of the AC-DC-AC traction converter is between 0.7Ue and 0.6Ue, the AC-DC-AC traction converter controls the output power of the traction motor to drop linearly from 0.8Pe to 0;

When the input voltage of the AC-DC-AC traction converter is between 1.1Ue and 1.15Ue, the AC-DC-AC traction converter controls the output power of the traction motor to drop linearly from Pe to 0;

Among them, when designing the ground traction power supply system, the minimum voltage value of the input terminal of the AC-DC-AC traction converter TDS1 should not be less than 1.1 times of 0.6Ue, and the maximum voltage value should not be greater than 0.9 times of 1.2Ue.

11. The method according to claim 10, characterized in that: under regeneration conditions, the method comprises:

When the input terminal voltage of the AC-DC-AC traction converter is between 0.8Ue and 1.1Ue, the AC-DC-AC traction converter controls the regenerative power of the traction motor to be Pe;

When the input voltage of the AC-DC-AC traction converter is between 0.8Ue and 0.7Ue, the AC-DC-AC traction converter controls the regenerative power of the traction motor to drop linearly from Pe to 0.8Pe;

When the input voltage of the AC-DC-AC traction converter is between 0.7Ue and 0.6Ue, the AC-DC-AC traction converter controls the regenerative power of the traction motor to drop linearly from 0.8Pe to 0;

When the input terminal voltage of the AC-DC-AC traction converter is between 1.1Ue and 1.2Ue, the AC-DC-AC traction converter controls the regenerative power of the traction motor to drop linearly from Pe to 0.