CN113548067B - Mixed train traction system and control method thereof - Google Patents
Mixed train traction system and control method thereof Download PDFInfo
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- CN113548067B CN113548067B CN202010326281.5A CN202010326281A CN113548067B CN 113548067 B CN113548067 B CN 113548067B CN 202010326281 A CN202010326281 A CN 202010326281A CN 113548067 B CN113548067 B CN 113548067B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C3/00—Electric locomotives or railcars
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C3/00—Electric locomotives or railcars
- B61C3/02—Electric locomotives or railcars with electric accumulators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61C—LOCOMOTIVES; MOTOR RAILCARS
- B61C7/00—Other locomotives or motor railcars characterised by the type of motive power plant used; Locomotives or motor railcars with two or more different kinds or types of motive power
- B61C7/04—Locomotives or motor railcars with two or more different kinds or types of engines, e.g. steam and IC engines
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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
- H02M1/10—Arrangements incorporating converting means for enabling loads to be operated at will from different kinds of power supplies, e.g. from ac or dc
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T30/00—Transportation of goods or passengers via railways, e.g. energy recovery or reducing air resistance
Abstract
The invention provides a mixed system train traction system and a control method thereof, wherein the mixed system train traction system comprises the following steps: the system comprises a pantograph, a traction transformer, a network control system, a power battery and a traction generator; a traction converter connected to the traction transformer and the network control system; the first circuit breaker is connected with the pantograph and used for connecting an alternating current power supply network, the traction transformer and the network control system; the second circuit breaker is connected with the pantograph and used for connecting a direct current power supply network, the traction converter and the network control system; and the motor is connected with the traction converter. The invention provides a hybrid train traction system which can be used for four power supply systems: the system comprises an alternating current power supply system, a direct current power supply system, a power battery power supply system and a traction generator power supply system, can be applied to various power supply systems in a complex power supply environment, improves the utilization rate of a train traction system, enlarges the application scene of a train, and avoids passengers from transferring vehicles midway.
Description
Technical Field
The application relates to the technical field of rail transit, in particular to a hybrid train traction system and a control method thereof.
Background
In the current global rail transit field, the domestic trunk and the intercity line are mainly supplied with power by AC25kV/50Hz, the urban rail transit is mainly supplied with power by DC1500V and DC750V, parts of countries in Europe are supplied with power by AC15kV/16.7Hz, parts of countries in southeast Asia and Africa and the like do not have a unified power supply network for supplying power to rail transit trains, so the rail transit power supply systems in the global range are different.
At present, most hybrid train traction systems only provide one or two power supply systems, and cannot be suitable for multiple power supply systems in complex power supply environments.
Disclosure of Invention
In view of this, the application provides a hybrid system train traction system and a control method thereof, which can be applied to multiple power supply systems in a complex power supply environment.
In order to achieve the above object, the present invention provides the following technical features:
a hybrid train traction system comprising:
the system comprises a pantograph, a traction transformer, a network control system, a power battery and a traction generator;
a traction converter connected to the traction transformer and the network control system;
the first circuit breaker is connected with the pantograph and used for connecting an alternating current power supply network, the traction transformer and the network control system;
the second circuit breaker is connected with the pantograph and used for connecting a direct current power supply network, the traction converter and the network control system;
and the motor is connected with the traction converter.
Optionally, the traction converter comprises:
the first pre-charging unit and the second pre-charging unit are respectively connected with two taps of a secondary winding of the traction transformer;
the first rectifying unit is connected with the first pre-charging unit, and the second rectifying unit is connected with the second pre-charging unit;
a first switch is arranged between a first tap of the traction transformer and the first rectifying unit, and a second switch is arranged between a second tap of the traction transformer and the second rectifying unit;
the intermediate direct current link is connected with the first rectifying unit and the second rectifying unit;
the first inversion unit and the second inversion unit are connected with the intermediate direct current link; the first inversion unit and the second inversion unit are used for connecting a motor;
a third pre-charging unit, one end of which is connected with two taps of the secondary winding of the traction transformer and the other end of which is connected with the second breaker;
one end of the fourth pre-charging unit is connected with two taps of the secondary winding of the traction transformer, and the other end of the fourth pre-charging unit is connected with a power battery;
a fifth pre-charging unit, one end of which is connected with the first rectifying unit and the second rectifying unit respectively, and the other end of which is connected with the traction generator;
a direct current load grounding relay connected with the intermediate direct current link;
and the transmission control unit is used for controlling each component.
Optionally, the hybrid train traction system further includes:
the network voltage transformer is used for inducing the network voltage of the alternating current power supply network;
and the brake resistor is connected with the first inversion unit and the second inversion unit.
Optionally, the alternating current power supply network comprises an AC25kV/50Hz alternating current power supply system;
the direct-current power supply network comprises a DC1500V direct-current power supply system;
the power battery comprises a DC750V power battery power supply system
The traction generator comprises a 700kW diesel generator set carried by the train.
A control method of a hybrid train traction system comprises the following steps:
the network control system is used for receiving the system adjusting instruction to determine the current power supply system:
under the condition that the current power supply system is a pantograph network power supply system, a driver executes pantograph lifting operation, sends a pantograph network power supply system signal and a driver direction handle signal to the traction converter, and closes the first circuit breaker or the second circuit breaker to connect a contact network so that the traction converter works in an alternating current power supply system or a direct current power supply system;
sending a power battery power supply system signal and a driver handle level to a traction converter under the condition that the current power supply system is a power battery power supply system, so that the traction converter works in the power battery power supply system;
and under the condition that the current power supply system is a traction generator power supply system, sending a traction generator power supply system signal and a driver handle level to a traction converter so that the traction converter works in the traction generator power supply system.
Optionally, the traction converter has the structural connection of the traction converter; the traction converter receives the current power supply system and the driver handle level sent by the network control system;
under the condition that the current power supply system of the hybrid system train traction system is a pantograph network power supply system, identifying whether the contact network is a direct current power supply system or an alternating current power supply system;
under the condition that the current power supply system is an alternating current power supply system, adjusting a secondary side tap of a traction transformer to an alternating current power supply gear, controlling a direct current load grounding relay to be disconnected, controlling a first pre-charging unit and a second pre-charging unit to be conducted to charge in an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system of the hybrid train traction system is a direct-current power supply system, adjusting a secondary side tap of a traction transformer to a direct-current power supply gear, controlling a direct-current load grounding relay to be closed, controlling a third pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct-current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct-current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system of the hybrid train traction system is a power battery power supply system, adjusting a secondary side tap of a traction transformer to a direct current power supply gear, controlling a direct current load grounding relay to be disconnected, controlling a fourth pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
and under the condition that the current power supply system of the hybrid train traction system is a traction generator power supply system, controlling the direct-current load grounding relay to be disconnected, controlling the fifth pre-charging unit to be switched on to charge the intermediate direct-current link, starting the first rectifying unit and the second rectifying unit after the intermediate direct-current link is charged, and adjusting the first inverting unit and the second inverting unit according to the level of the driver handle to control the motor to operate.
Optionally, the alternating current supply network includes AC25kV/50Hz, the direct current supply network includes DC1500V, the power battery includes a power supply system of a DC750V power battery, and the traction generator includes a 700kW diesel generator set provided by the train itself; the rated voltage of the intermediate direct current link is DC1500V; the intermediate direct current link is connected with the auxiliary inversion unit;
then, starting the first rectifying unit and the second rectifying unit after the intermediate dc link is charged includes:
under the condition that the current power supply system of the hybrid system train traction system is an alternating current power supply system, a first rectifying unit and a second rectifying unit work in a rectifying mode, and alternating current after voltage reduction by the traction transformer is converted into direct current with rated voltage and is input into an intermediate direct current loop for the first inverter, the second inverter and the auxiliary inverting unit to use;
under the condition that the current power supply system of the hybrid system train traction system is a direct current power supply system, a first rectifying unit and a second rectifying unit work in a one-way conduction mode, direct current is directly input into an intermediate direct current loop and used by a first inverter, a second inverter and an auxiliary inverting unit;
under the condition that the current power supply system of the hybrid train traction system is a power battery power supply system, when the level of a driver handle is at a zero position, the first rectifying unit and the second rectifying unit are controlled to work in a boosting mode, and direct current is boosted to a rated voltage and then input to an intermediate direct current loop for the auxiliary inverter unit to use; when the driver handle level is at a traction position, the first rectifying unit and the second rectifying unit are controlled to work in a boosting mode, and direct current is boosted to rated voltage and then input to an intermediate direct current loop for the first inverter, the second inverter and the auxiliary inverter unit to use; when the driver handle level is at a brake position, the first rectifying unit and the second rectifying unit are controlled to work in a voltage reduction mode, and the direct current of the middle direct current loop is reduced to the rated voltage of the power battery and then stored in the power battery;
under the condition that the current power supply system of the hybrid train traction system is a traction generator power supply system, the first rectifying unit and the second rectifying unit are controlled to work in a three-phase uncontrolled rectifying mode, so that the voltage of the intermediate direct-current link is maintained at a rated voltage and is used by the first inverter, the second inverter and the auxiliary inverter unit.
A traction converter comprising:
the first pre-charging unit and the second pre-charging unit are respectively connected with two taps of a secondary winding of the traction transformer; the traction transformer is used for connecting an alternating current power supply network through a first circuit breaker, and transmitting electric energy to the traction converter through transformation;
the first rectifying unit is connected with the first pre-charging unit, and the second rectifying unit is connected with the second pre-charging unit;
a first switch is arranged between a first tap of the traction transformer and the first rectifying unit, and a second switch is arranged between a second tap of the traction transformer and the second rectifying unit;
the intermediate direct current link is connected with the first rectifying unit and the second rectifying unit;
the first inversion unit and the second inversion unit are connected with the intermediate direct current link;
the first inversion unit and the second inversion unit are used for being connected with a motor;
a third pre-charging unit, one end of which is connected with two taps of the secondary winding of the traction transformer, and the other end of which is connected with the second breaker and used for connecting a direct current power supply network;
one end of the fourth pre-charging unit is connected with two taps of the secondary winding of the traction transformer, and the other end of the fourth pre-charging unit is connected with a power battery;
a fifth pre-charging unit, one end of which is connected with the first rectifying unit and the second rectifying unit respectively, and the other end of which is connected with the traction generator;
and the direct current load grounding relay is connected with the intermediate direct current link.
A control method of a hybrid train traction system is applied to a traction converter and comprises the following steps:
determining the current power supply system and the driver handle level of the hybrid system train traction system;
under the condition that the current power supply system of the hybrid system train traction system is a pantograph network power supply system, identifying whether the contact network is a direct current power supply system or an alternating current power supply system;
under the condition that the current power supply system is an alternating current power supply system, adjusting a secondary side tap of a traction transformer to an alternating current power supply gear, adjusting the secondary side tap of the traction transformer to the alternating current power supply gear, controlling a direct current load grounding relay to be disconnected, controlling a first pre-charging unit and a second pre-charging unit to be conducted to charge in an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system is a direct-current power supply system, adjusting a secondary side tap of a traction transformer to a direct-current power supply gear, controlling a direct-current load grounding relay to be closed, controlling a third pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct-current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct-current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system of the hybrid train traction system is a power battery power supply system, adjusting a secondary side tap of a traction transformer to a direct current power supply gear, controlling a direct current load grounding relay to be disconnected, controlling a fourth pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system of the hybrid system train traction system is a traction generator power supply system, the direct-current load grounding relay is controlled to be disconnected, the fifth pre-charging unit is controlled to be conducted to charge the middle direct-current link, the first rectifying unit and the second rectifying unit are started after the middle direct-current link is charged, and the first inverting unit and the second inverting unit are adjusted according to the level of the driver handle to control the motor to operate.
Through the technical means, the following beneficial effects can be realized:
the invention provides a hybrid train traction system which can be used for four power supply systems: the system comprises an alternating current power supply system, a direct current power supply system, a power battery power supply system and a traction generator power supply system, can be applied to various power supply systems in a complex power supply environment, improves the utilization rate of a train traction system, enlarges the application scene of a train, and avoids passengers from transferring vehicles midway.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a hybrid train traction system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a traction converter in a hybrid train traction system according to an embodiment of the present invention;
fig. 3 is a flowchart of a control method for a hybrid train traction system according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a traction converter in a hybrid train traction system according to an embodiment of the present invention;
fig. 5 is a flowchart of a control method for a hybrid train traction system according to another embodiment of the present invention;
fig. 6 is a flowchart of a control method for a hybrid train traction system according to another embodiment of the present invention;
FIG. 7 is a diagram illustrating the structure of a first pre-charge unit and a second pre-charge unit according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a third precharge unit and a fourth precharge unit according to an embodiment of the present invention;
fig. 9 is a structural diagram of a fifth precharge unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, the present invention provides a hybrid train traction system, including:
the system comprises a pantograph 1, a traction transformer 2, a network control system 3, a power battery 4 and a traction generator 5; the traction converter 6 connects the power battery 4 and the traction generator 5.
A traction converter 6 connected to the traction transformer 2 and the network control system 3;
the first circuit breaker K1 is connected with the pantograph 1, used for connecting an alternating current power supply network, the traction transformer 2 and the network control system 3;
the second circuit breaker K2 is connected with the pantograph 1, used for connecting a direct current power supply network, the traction converter 6 and the network control system 3;
and the motor 7 is connected with the traction converter 6.
The network control system connects the first breaker K1 and the second breaker K2 (the connection relation is not indicated in the figure)
Through the technical means, the following beneficial effects can be realized:
the invention provides a hybrid train traction system which can be used for four power supply systems: the system comprises an alternating current power supply system, a direct current power supply system, a power battery power supply system and a traction generator power supply system, can be applied to various power supply systems in complex power supply environments, improves the utilization rate of a train traction system, enlarges the application scene of a train, and avoids passengers from transferring vehicles midway.
How a network control system in a hybrid train traction system adjusts multiple power supply systems is described as follows:
and the network control system 3 is used for receiving the power supply system signal and sending the power supply system signal to the transmission control unit of the traction converter so as to determine the power supply system.
A driver can send a power supply system signal to a network control system through interaction modes such as a button, a key or a touch screen when a train runs to a junction of one power supply system and the other power supply system, and the network control system sends the power supply system signal to a transmission control unit of the traction converter according to a protocol or a hard line.
For example, a button of a power battery powered system, a button of a traction generator, or a button of a pantograph powered system is pressed. And the network control system monitors a power supply system signal generated after the operation of a driver and sends the power supply system signal to a transmission control unit of the traction converter, and the current power supply system is determined by the transmission control unit.
Referring to fig. 2, the following describes the processing procedure of the network control system in three power supply modes:
the first method comprises the following steps: bow net power supply system.
And under the condition that the current power supply system is a pantograph network power supply system, sending a pantograph network power supply system signal and a driver handle level to the traction converter, performing pantograph lifting operation on the pantograph, and closing the first circuit breaker or the second circuit breaker to connect the contact network so as to enable the traction converter to work in an alternating current power supply system or a direct current power supply system.
And closing the first circuit breaker K1 in the alternating-current power supply system, and controlling the second circuit breaker K2 to be closed in the direct-current power supply system.
And the second method comprises the following steps: and a power battery power supply system.
And under the condition that the current power supply system is a power battery power supply system, sending a power battery power supply system signal and a driver handle level to the traction converter so that the traction converter works in the power battery power supply system.
And the third is that: traction generator power supply system.
And under the condition that the current power supply system is a traction generator power supply system, sending a traction generator power supply system signal and a driver handle level to a traction converter so that the traction converter works in the traction generator power supply system.
The hybrid train traction system further comprises:
the network voltage transformer is used for inducing the network voltage of the alternating current power supply network; and a brake resistor (not shown in fig. 1) connected to the first inverter unit and the second inverter unit.
Referring to fig. 3, the present invention provides a first embodiment of a traction converter on the basis of fig. 1.
And a first pre-charging unit 61 and a second pre-charging unit 62 connected to two taps of the secondary winding of the traction transformer 2, respectively.
A first rectifying unit 63 connected to the first pre-charging unit 61, and a second rectifying unit 64 connected to the second pre-charging unit 62.
A first switch KM3 is provided between a first tap (S1, S2, and S3 in the drawing) of the traction transformer 2 and the first rectifying unit 63, and a second switch KM7 is provided between a second tap (S4, S5, and S6 in the drawing) of the traction transformer 2 and the second rectifying unit 64.
An intermediate dc link 65 connected to the first rectifying unit 63 and the second rectifying unit 64;
a first inverter unit 66 and a second inverter unit 67 connected to the intermediate dc link 65;
the first inverter unit 66 and the second inverter unit 67 are used for connecting the motors 7, and normally, one inverter unit is connected with two motors, so that there are 4 motors in fig. 2.
A third pre-charging unit 68, one end of which is connected with two taps of the secondary winding of the traction transformer 2, and the other end of which is connected with the second breaker K2 for connecting with a direct current power supply network;
a fourth pre-charging unit 69, one end of which is connected with two taps of the secondary winding of the traction transformer 2 and the other end of which is connected with the power battery 4;
a fifth precharge unit 610 having one end connected to the first rectifying unit 63 and the second rectifying unit 64, respectively, and the other end connected to the traction generator 5;
and a dc load grounding relay 611 connected to the intermediate dc link 65.
A transmission control unit 612 (the connection to each component is not marked in the figure) for connecting with each component and controlling each component.
Referring to fig. 4, the present invention provides a second embodiment of a traction converter.
On the basis of fig. 2, an auxiliary inversion unit connected with the intermediate direct-current link is added. The auxiliary inversion unit is used for connecting a charger load and an auxiliary transformer.
The alternating current power supply network comprises AC25kV/50Hz; the direct current power supply network comprises DC1500V; the power battery comprises a DC750V power battery power supply system, and the traction generator comprises a 700kW diesel generator set carried by the train.
With reference to fig. 5, the operation of the traction converter is described below on the basis of fig. 4:
s501: the traction converter detects a power supply system signal, namely receives the current power supply system and the driver handle level sent by the network control system.
The transmission control unit can receive a current power supply system and a driver handle level sent by the network control system, and the current power supply system can include: a bow net power supply system, a power battery power supply system or a traction generator power supply system.
S502: and judging whether the current power supply system is a bow net power supply system, a power battery power supply system or a traction generator power supply system.
Step S503: and executing different operations under different power supply modes to control the motor to operate.
The first bow net power supply system:
s11: and identifying whether the contact network is a direct current power supply system or an alternating current power supply system.
In order to further distinguish an alternating current power supply system from a direct current power supply system, two implementation modes are provided:
the first mode is as follows: the transmission control unit can acquire an alternating current network voltage signal by means of a network voltage transformer arranged on the alternating current power supply network side, and acquire a direct current voltage signal by means of a voltage sensor arranged on the direct current power supply network side to identify a direct current power supply system or an alternating current power supply system.
Referring to fig. 6, a flow for identifying the dc power supply system or the ac power supply system of the traction converter is shown. The method comprises the following steps:
s601: the method comprises the steps of collecting an alternating current network voltage signal of a network voltage transformer and collecting a direct current network voltage signal of a voltage sensor.
S602: judging whether the peak value of the alternating current network voltage signal is greater than a threshold value; if yes, go to step S603; if not, the step S605 is executed;
step S603: and judging whether the duration time reaches the preset time. If so, the process proceeds to step S604, otherwise, the process proceeds to step S605.
Step S604: judging whether the peak value of the direct current network voltage signal is greater than a threshold value; if not, determining that the power supply mode is an alternating current power supply system, and if so, determining that the power supply mode is abnormal.
Step S605: judging whether the peak value of the direct current network voltage signal is greater than a threshold value; if so, determining the power supply mode to be a direct current power supply mode, and otherwise, determining the power supply mode to be abnormal.
The second mode is as follows: the detection is performed by other devices such as ECO-BOX in the manner shown in fig. 6, and then the detection result (dc power supply system or ac power supply system) is sent to the transmission control unit.
S12: under the condition that the current power supply system is determined to be the alternating current power supply system:
adjusting a secondary side tap of the traction transformer to an alternating current power supply gear, and controlling a direct current load grounding relay to be disconnected;
the first pre-charging unit and the second pre-charging unit are controlled to be conducted to charge the intermediate direct-current link (the intermediate direct-current voltage is stabilized to be close to the rated voltage);
starting the first rectifying unit, the second rectifying unit and the auxiliary inverter unit after the intermediate direct-current link is charged, wherein the first rectifying unit and the second rectifying unit work in a rectifying mode;
and adjusting the first inverter unit and the second inverter unit according to the grade position of the driver handle to control the motor to operate.
When the current power supply system of the hybrid system train traction system is an alternating current power supply system, the first rectifying unit and the second rectifying unit work in a rectifying mode, and alternating current after voltage reduction by the traction transformer is converted into direct current with rated voltage and input into the intermediate direct current loop for the first inverter, the second inverter and the auxiliary inverting unit.
S13: under the condition that the current power supply system is determined to be the direct-current power supply system:
adjusting a secondary side tap of the traction transformer to a direct current power supply gear, and controlling a direct current load grounding relay to be closed;
controlling the third pre-charging unit, the first switch and the second switch to be conducted to charge the intermediate direct-current link (stabilizing the intermediate direct-current voltage near the rated voltage);
starting the first rectifying unit and the second rectifying unit after the intermediate direct-current link is charged, wherein upper tubes of a C phase and a D phase in the first rectifying unit and the second rectifying unit are in one-way conduction and work in a one-way conduction mode;
and adjusting the first inverter unit and the second inverter unit according to the grade position of the driver handle to control the motor to operate.
Under the condition that the current power supply system of the hybrid system train traction system is a direct-current power supply system, the first rectifying unit and the second rectifying unit work in a one-way conduction mode, direct current is directly input into the middle direct-current loop and used by the first inverter, the second inverter and the auxiliary inverter unit.
And the second method comprises the following steps: and a power battery power supply system.
Under the condition that the current power supply system is determined to be a power battery power supply system:
adjusting the traction transformer to a direct current power supply gear, and controlling a direct current load grounding relay to be disconnected;
controlling the fourth pre-charging unit, the first switch and the second switch to be conducted to charge the intermediate direct-current link;
and after the intermediate direct current link is charged, starting the first rectifying unit and the second rectifying unit, and adjusting the first inversion unit and the second inversion unit according to the level of the driver handle to control the motor to operate.
The method comprises the steps of firstly judging whether a driver handle level is in a zero position, if so, controlling the first rectifying unit and the second rectifying unit to work in a boosting mode, boosting direct current to rated voltage, and then inputting the boosted direct current to a middle direct current loop for an auxiliary inverter unit to use. In the Boost mode, the upper tubes of the phases C and D of the first rectifying unit and the second rectifying unit are used as power diodes, so that a Boost circuit is formed.
And judging whether the driver handle level is at a traction level, if so, controlling the first rectifying unit and the second rectifying unit to work in a boosting mode, boosting the direct current to rated voltage, and inputting the boosted direct current to an intermediate direct current loop for the first inverter, the second inverter and the auxiliary inverting unit. In the Boost mode, the upper tubes of the phases C and D of the first rectifying unit and the second rectifying unit are used as power diodes, so that a Boost circuit is formed.
If the driver handle level is not in the zero position or the traction position, the driver handle level is in the brake position, and after the intermediate direct-current link is charged, the first rectifying unit and the second rectifying unit are controlled to work in a voltage reduction mode, and direct current of the intermediate direct-current loop is reduced to the rated voltage of the power battery and then stored in the power battery. In the Buck mode, namely, the C-phase and D-phase lower tubes in the first rectifying unit and the second rectifying unit are used as power diodes to form a Buck circuit.
And the third is that: traction generator power supply system.
Under the condition that the current power supply system is a traction generator power supply system:
controlling the direct current load grounding relay to be disconnected;
controlling the fifth pre-charging unit to be conducted to charge the intermediate direct-current link; the first rectifying unit and the second rectifying unit are controlled to work in a three-phase uncontrolled rectifying mode; the three-phase uncontrolled rectification mode is that the first rectification unit and the second rectification unit control the A/B/C/D phase of the rectification unit 1 and the A/B phase (3 bridge arms in total) of the rectification unit 2 to carry out three-phase uncontrolled rectification, so that the intermediate direct current return voltage is maintained near the rated voltage, and the intermediate direct current link is charged.
Starting the first rectifying unit and the second rectifying unit after the intermediate direct-current link is charged;
and adjusting the first inverter unit and the second inverter unit according to the grade position of the driver handle to control the motor to operate.
Under the condition that the current power supply system of the hybrid system train traction system is a traction generator power supply system, the first rectifying unit and the second rectifying unit are controlled to work in a three-phase uncontrolled rectifying mode, so that the voltage of the intermediate direct-current link is maintained at a rated voltage and is used by the first inverter, the second inverter and the auxiliary inverter unit.
Through the technical means, the following beneficial effects can be realized:
the invention provides a hybrid train traction system which can be used for four power supply systems: the system comprises an alternating current power supply system, a direct current power supply system, a power battery power supply system and a traction generator power supply system, can be applied to various power supply systems in complex power supply environments, improves the utilization rate of a train traction system, enlarges the application scene of a train, and avoids passengers from transferring vehicles midway.
The functions described in the method of the present embodiment, if implemented in the form of software functional units and sold or used as independent products, may be stored in a storage medium readable by a computing device. Based on such understanding, part of the contribution to the prior art of the embodiments of the present application or part of the technical solution may be embodied in the form of a software product stored in a storage medium and including several instructions for causing a computing device (which may be a personal computer, a server, a mobile computing device or a network device) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk, and various media capable of storing program codes.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A hybrid train traction system, comprising:
the system comprises a pantograph, a traction transformer, a network control system, a power battery and a traction generator;
a traction converter connected to the traction transformer and the network control system;
the first circuit breaker is connected with the pantograph and used for connecting an alternating current power supply network, the traction transformer and the network control system;
the second circuit breaker is connected with the pantograph and used for connecting a direct current power supply network, the traction converter and the network control system;
a motor connected to the traction converter;
the traction converter comprises:
the first pre-charging unit and the second pre-charging unit are respectively connected with two taps of a secondary winding of the traction transformer;
the first rectifying unit is connected with the first pre-charging unit, and the second rectifying unit is connected with the second pre-charging unit;
a first switch is arranged between a first tap of the traction transformer and the first rectifying unit, and a second switch is arranged between a second tap of the traction transformer and the second rectifying unit;
the intermediate direct current link is connected with the first rectifying unit and the second rectifying unit;
the first inversion unit and the second inversion unit are connected with the intermediate direct current link; the first inversion unit and the second inversion unit are used for being connected with a motor;
a third pre-charging unit, one end of which is connected with two taps of the secondary winding of the traction transformer and the other end of which is connected with the second breaker;
one end of the fourth pre-charging unit is connected with two taps of the secondary winding of the traction transformer, and the other end of the fourth pre-charging unit is connected with a power battery;
a fifth pre-charging unit, one end of which is connected with the first rectifying unit and the second rectifying unit respectively, and the other end of which is connected with the traction generator;
a direct current load grounding relay connected with the intermediate direct current link;
and the transmission control unit is used for controlling each component.
2. The hybrid train traction system as defined in claim 1, further comprising:
the network voltage transformer is used for inducing the network voltage of the alternating current power supply network;
and the brake resistor is connected with the first inversion unit and the second inversion unit.
3. The hybrid train traction system of claim 1,
the alternating current power supply network comprises an AC25kV/50Hz alternating current power supply system;
the direct-current power supply network comprises a DC1500V direct-current power supply system;
the power battery comprises a DC750V power battery power supply system
The traction generator comprises a 700kW diesel generator set carried by the train.
4. A control method of a hybrid train traction system is characterized by comprising the following steps:
the network control system is used for receiving the system adjusting instruction to determine the current power supply system:
under the condition that the current power supply system is a pantograph network power supply system, a driver executes pantograph lifting operation, sends a pantograph network power supply system signal and a driver direction handle signal to the traction converter, and closes the first circuit breaker or the second circuit breaker to connect a contact network so that the traction converter works in an alternating current power supply system or a direct current power supply system;
under the condition that the current power supply system is a power battery power supply system, sending a power battery power supply system signal and a driver handle level to a traction converter so that the traction converter works in the power battery power supply system;
sending a traction generator power supply system signal and a driver handle level to a traction converter under the condition that the current power supply system is a traction generator power supply system, so that the traction converter works in the traction generator power supply system;
the traction converter receives a current power supply system and a driver handle level sent by the network control system;
under the condition that the current power supply system of the hybrid system train traction system is a pantograph network power supply system, identifying whether the contact network is a direct current power supply system or an alternating current power supply system;
under the condition that the current power supply system is an alternating current power supply system, adjusting a secondary side tap of a traction transformer to an alternating current power supply gear, controlling a direct current load grounding relay to be disconnected, controlling a first pre-charging unit and a second pre-charging unit to be conducted to charge in an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system of the hybrid train traction system is a direct-current power supply system, adjusting a secondary side tap of a traction transformer to a direct-current power supply gear, controlling a direct-current load grounding relay to be closed, controlling a third pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct-current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct-current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system of the hybrid train traction system is a power battery power supply system, adjusting a secondary side tap of a traction transformer to a direct current power supply gear, controlling a direct current load grounding relay to be disconnected, controlling a fourth pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
and under the condition that the current power supply system of the hybrid train traction system is a traction generator power supply system, controlling the direct-current load grounding relay to be disconnected, controlling the fifth pre-charging unit to be switched on to charge the intermediate direct-current link, starting the first rectifying unit and the second rectifying unit after the intermediate direct-current link is charged, and adjusting the first inverting unit and the second inverting unit according to the level of the driver handle to control the motor to operate.
5. The method of claim 4,
the alternating current power supply network comprises AC25kV/50Hz, the direct current power supply network comprises DC1500V, the power battery comprises a DC750V power battery power supply system, and the traction generator comprises a 700kW diesel generator set carried by the train; the rated voltage of the intermediate direct current link is DC1500V; the intermediate direct current link is connected with the auxiliary inversion unit;
then starting the first rectifying unit and the second rectifying unit after the intermediate direct-current link is charged includes:
under the condition that the current power supply system of the hybrid system train traction system is an alternating current power supply system, a first rectifying unit and a second rectifying unit work in a rectifying mode, and alternating current after voltage reduction by the traction transformer is converted into direct current with rated voltage and is input into an intermediate direct current loop for the first inverter, the second inverter and the auxiliary inverting unit to use;
under the condition that the current power supply system of the hybrid system train traction system is a direct current power supply system, a first rectifying unit and a second rectifying unit work in a one-way conduction mode, direct current is directly input into an intermediate direct current loop and used by a first inverter, a second inverter and an auxiliary inverting unit;
under the condition that the current power supply system of the hybrid train traction system is a power battery power supply system, when the level of a driver handle is at a zero position, the first rectifying unit and the second rectifying unit are controlled to work in a boosting mode, and direct current is boosted to a rated voltage and then input to an intermediate direct current loop for the auxiliary inverter unit to use; when the driver handle level is at a traction position, the first rectifying unit and the second rectifying unit are controlled to work in a boosting mode, and direct current is boosted to rated voltage and then input to an intermediate direct current loop for the first inverter, the second inverter and the auxiliary inverter unit to use; when the driver handle level is at a brake position, the first rectifying unit and the second rectifying unit are controlled to work in a voltage reduction mode, and direct current of the intermediate direct current loop is reduced to rated voltage of a power battery and then stored in the power battery;
under the condition that the current power supply system of the hybrid train traction system is a traction generator power supply system, the first rectifying unit and the second rectifying unit are controlled to work in a three-phase uncontrolled rectifying mode, so that the voltage of the intermediate direct-current link is maintained at a rated voltage and is used by the first inverter, the second inverter and the auxiliary inverter unit.
6. A traction converter, comprising:
the first pre-charging unit and the second pre-charging unit are respectively connected with two taps of a secondary winding of the traction transformer; the traction transformer is used for connecting an alternating current power supply network through a first circuit breaker, and transmitting electric energy to the traction converter through transformation;
the first rectifying unit is connected with the first pre-charging unit, and the second rectifying unit is connected with the second pre-charging unit;
a first switch is arranged between a first tap of the traction transformer and the first rectifying unit, and a second switch is arranged between a second tap of the traction transformer and the second rectifying unit;
the intermediate direct current link is connected with the first rectifying unit and the second rectifying unit;
the first inversion unit and the second inversion unit are connected with the intermediate direct current link;
the first inversion unit and the second inversion unit are used for being connected with a motor;
a third pre-charging unit, one end of which is connected with two taps of the secondary winding of the traction transformer, and the other end of which is connected with a second breaker and used for connecting a direct current power supply network;
one end of the fourth pre-charging unit is connected with two taps of the secondary winding of the traction transformer, and the other end of the fourth pre-charging unit is connected with a power battery;
a fifth pre-charging unit, one end of which is connected with the first rectifying unit and the second rectifying unit respectively, and the other end of which is connected with the traction generator;
and the direct current load grounding relay is connected with the intermediate direct current link.
7. A control method of a hybrid train traction system, applied to the traction converter of claim 6, comprising:
determining the current power supply system and the driver handle level of the hybrid system train traction system;
under the condition that the current power supply system of the hybrid system train traction system is a pantograph network power supply system, identifying whether the contact network is a direct current power supply system or an alternating current power supply system;
under the condition that the current power supply system is an alternating current power supply system, adjusting a secondary side tap of a traction transformer to an alternating current power supply gear, adjusting a secondary side tap of the traction transformer to an alternating current power supply gear, controlling a direct current load grounding relay to be disconnected, controlling a first pre-charging unit and a second pre-charging unit to be conducted to charge in an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
adjusting a secondary side tap of a traction transformer to a direct current power supply gear under the condition that the current power supply system is a direct current power supply system, controlling a direct current load grounding relay to be closed, controlling a third pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct current link is charged, and adjusting a first inversion unit and a second inversion unit according to the level of a driver handle to control the motor to operate;
under the condition that the current power supply system of the hybrid system train traction system is a power battery power supply system, adjusting a secondary tap of a traction transformer to a direct-current power supply gear, controlling a direct-current load grounding relay to be disconnected, controlling a fourth pre-charging unit, a first switch and a second switch to be conducted to charge an intermediate direct-current link, starting a first rectifying unit and a second rectifying unit after the intermediate direct-current link is charged, and adjusting a first inversion unit and a second inversion unit according to the handle level of a driver to control the motor to operate;
under the condition that the current power supply system of the hybrid system train traction system is a traction generator power supply system, the direct-current load grounding relay is controlled to be disconnected, the fifth pre-charging unit is controlled to be conducted to charge the middle direct-current link, the first rectifying unit and the second rectifying unit are started after the middle direct-current link is charged, and the first inverting unit and the second inverting unit are adjusted according to the level of the driver handle to control the motor to operate.
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