CN111384867A - Traction transformer control method, device, equipment, storage medium and rail vehicle - Google Patents
Traction transformer control method, device, equipment, storage medium and rail vehicle Download PDFInfo
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- CN111384867A CN111384867A CN201811631351.7A CN201811631351A CN111384867A CN 111384867 A CN111384867 A CN 111384867A CN 201811631351 A CN201811631351 A CN 201811631351A CN 111384867 A CN111384867 A CN 111384867A
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
- H02M3/33576—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33592—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements having at least one active switching element at the secondary side of an isolation transformer having a synchronous rectifier circuit or a synchronous freewheeling circuit at the secondary side of an isolation transformer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention provides a traction transformer control method, a traction transformer control device, traction transformer control equipment, a storage medium and a rail vehicle. The traction transformer control method provided by the invention comprises the steps of controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current and the preset voltage of the four-quadrant rectifier in each conversion unit and the secondary side voltage of the high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal; and controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal. The method improves the running stability of the transmission system of the railway vehicle.
Description
Technical Field
The invention relates to a rail transit technology, in particular to a traction transformer control method, a traction transformer control device, traction transformer control equipment, a storage medium and a rail vehicle.
Background
With the development of national economy and science and technology, railway transportation plays an increasingly important role in various fields of national production, and the transportation capacity and the transportation stability of a rail vehicle as a carrier of railway transportation directly determine the capacity of the railway transportation.
The transmission system is a core power system of the rail vehicle, the vehicle-mounted transmission system can adopt an electric power electronic traction transformer to realize the conversion of electric energy, and the electric power electronic traction transformer comprises a plurality of conversion units.
In the prior art, the coordination control of a plurality of conversion units of the power electronic traction transformer cannot be realized, and the current-equalizing and voltage-equalizing effects of the plurality of conversion units are poor, so that the output voltage of the power electronic traction transformer is unstable, and the running stability of a transmission system of a railway vehicle is reduced.
Disclosure of Invention
The invention provides a traction transformer control method, a traction transformer control device, traction transformer control equipment, a storage medium and a railway vehicle, so that the output voltage of a traction transformer is stable, and the running stability of a transmission system of the railway vehicle is improved.
The invention provides a control method of a traction transformer, wherein the traction transformer comprises a plurality of conversion units, the input ends of the conversion units are sequentially connected in series, and the output ends of the conversion units are connected in parallel; each conversion unit comprises a four-quadrant rectifier and a direct current/direct current DC/DC converter, wherein the output end of the four-quadrant rectifier is connected with the input end of the DC/DC converter, the output end of the DC/DC converter is the output end of each conversion unit, and the DC/DC converter comprises a high-frequency transformer; the traction transformer control method comprises the following steps:
controlling pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and a secondary side voltage of a high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal;
and controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal.
Optionally, the controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, the preset voltage, and the secondary side voltage of the high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal, includes:
determining an instruction voltage according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and the secondary side voltage of a high-frequency transformer in each conversion unit;
controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage and the command voltage, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal.
Optionally, the determining the command voltage according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, the preset voltage, and the secondary side voltage of the high-frequency transformer in each conversion unit includes:
determining the average value of the output voltages of the four-quadrant rectifiers in each conversion unit and a first voltage difference value of the preset voltage;
obtaining a first current after proportional integral operation of the first voltage difference value;
carrying out phase adjustment on the first current to obtain a second current;
determining a first current difference between the second current and the output current of the four-quadrant rectifier;
and determining the difference between the output value of the first current difference after proportional resonance operation and the secondary side voltage value of the high-frequency transformer as the command voltage.
Optionally, the controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage and the command voltage, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal includes:
determining a second voltage difference value between the output voltage of the four-quadrant rectifier in each conversion unit and the preset voltage;
obtaining a first voltage of each conversion unit after proportional-integral operation of the second voltage difference value of each conversion unit;
adding the first voltage of each conversion unit and the instruction voltage to obtain a second voltage of each conversion unit;
and controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the second voltage of each conversion unit so that the output voltages of the four-quadrant rectifier in each conversion unit are equal.
Optionally, the controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle, and the voltage of the output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal, includes:
determining a third voltage difference value between the input voltage of the DC/DC converter in each conversion unit and the voltage of the output end after parallel connection;
obtaining a third current of each conversion unit after proportional-integral operation is carried out on the third voltage difference value of each conversion unit;
determining a second current difference value of the third current of each conversion unit and the output current value of the DC/DC converter in each conversion unit;
obtaining a third voltage of each conversion unit after proportional-integral operation is carried out on the second current difference value of each conversion unit;
and controlling the output phase shift of each DC/DC converter according to the third voltage and a preset phase shift angle, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal.
The invention also provides a traction transformer control device, which comprises a plurality of conversion units, wherein the input ends of the conversion units are sequentially connected in series, and the output ends of the conversion units are connected in parallel; each conversion unit comprises a four-quadrant rectifier and a direct current/direct current DC/DC converter, wherein the output end of the four-quadrant rectifier is connected with the input end of the DC/DC converter, the output end of the DC/DC converter is the output end of each conversion unit, and the DC/DC converter comprises a high-frequency transformer; this traction transformer controlling means includes:
the first control module is used for controlling pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and the secondary side voltage of the high-frequency transformer in each conversion unit so as to enable the output voltages of the four-quadrant rectifiers in the plurality of conversion units to be equal;
and the second control module is used for controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal.
Optionally, the first control module includes:
the determining unit is used for determining the command voltage according to the output voltage of the four-quadrant rectifier in each converting unit, the output current of the four-quadrant rectifier in each converting unit, the preset voltage and the secondary side voltage of the high-frequency transformer in each converting unit;
and the control unit is used for controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage and the command voltage so as to enable the output voltages of the four-quadrant rectifiers in the plurality of conversion units to be equal.
The present invention may also provide a control apparatus including: a memory and a processor;
the memory is connected with the processor; the memory is used for storing a computer program;
the processor is used for calling the computer program stored in the memory so that the control device executes the traction transformer control method.
The present invention may also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the traction transformer control method described above.
The present invention may also provide a rail vehicle comprising a control system; the control system comprises a traction transformer and the control device.
The invention provides a traction transformer control method, a traction transformer control device, traction transformer control equipment, a storage medium and a rail vehicle. The traction transformer control method comprises the steps of controlling pulse width modulation of a four-quadrant rectifier in each conversion unit according to output voltage of the four-quadrant rectifier in each conversion unit, output current of the four-quadrant rectifier in each conversion unit, preset voltage and secondary side voltage of a high-frequency transformer in each conversion unit, so that the output voltage of the four-quadrant rectifier in the plurality of conversion units is equal; and controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal. According to the method, the voltage and the current of each unit in the traction transformer are collected, and the traction transformer is subjected to closed-loop control by combining the preset voltage and the preset phase shift angle, so that the output voltage of the traction transformer is stable, and the running stability of a transmission system of the railway vehicle is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a traction transformer;
fig. 2 is a flowchart of a traction transformer control method according to a first embodiment of the present invention;
fig. 3 is a flowchart of a second embodiment of a traction transformer control method provided in the present invention;
FIG. 4 is a control block diagram of a four-quadrant rectifier;
FIG. 5 is a control block diagram of the DC/DC converter;
fig. 6 is a schematic structural diagram of a traction transformer control apparatus according to a first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second traction transformer control apparatus according to an embodiment of the present invention;
fig. 8 is a block diagram of a control apparatus provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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 invention.
The traction transformer control method provided by the invention is suitable for the traction transformer of the railway vehicle, and the traction transformer can also be called as a power electronic traction transformer.
Fig. 1 is a schematic structural diagram of a traction transformer. As shown in fig. 1, the traction transformer includes a plurality of conversion units, which may also be referred to as power units, and units 1 to N shown in the figure are the number of conversion units, and may be set according to actual use conditions. The input ends of the plurality of conversion units are sequentially connected in series, and the input ends are connected with a traction contact net through a pantograph; the output ends of the plurality of conversion units are connected in parallel, and the output ends are connected with devices which need direct current input, such as a resistor, an inverter and the like. Each conversion unit comprises a four-quadrant rectifier 101, the output of which is connected to the input of the DC/DC converter 102, and a DC/DC converter 102, the output of which is the output of each conversion unit, which DC/DC converter comprises a high frequency transformer, as shown in fig. 1, which DC/DC converter is in fact a DC-AC-DC topology. A plurality of conversion units in the traction transformer can bear the voltage from a traction overhead line system in a balanced manner, and when a certain conversion unit fails and cannot work normally, the conversion unit can be cut off, and the remaining conversion units can still ensure the normal work of the traction transformer.
Fig. 2 is a flowchart of a traction transformer control method according to a first embodiment of the present invention. The method is applicable to the traction transformer. As shown in fig. 2, the method of the present embodiment includes:
s201, controlling pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and a secondary side voltage of a high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal.
In the present embodiment, the control target of the four-quadrant rectifier side in the plurality of conversion units is to make the four-quadrant rectifier operate at a unit power factor and output a stable dc voltage after receiving a sinusoidal input current. Therefore, the corresponding current or voltage in each conversion unit can be acquired through the acquisition equipment, the control equipment is used for carrying out closed-loop feedback control on each conversion unit in combination with a preset voltage, and the pulse width of the four-quadrant rectifier in each conversion unit is modulated according to the control result, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal. The preset voltage is also referred to as a reference voltage or a dc-side reference voltage, and the magnitude of the preset voltage may be predetermined according to the actual structure of the traction transformer.
S202, controlling output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal.
The DC/DC converter in each conversion unit is connected to a four-quadrant rectifier, the output of which is the input of the DC/DC converter. The voltages output by the four-quadrant rectifiers in the plurality of conversion units to the respectively corresponding DC/DC converters can be equalized through the steps. On the basis, the output voltage and the output current of the DC/DC converter in each conversion unit and the voltage of the output end after being connected in parallel, namely the output voltage of the traction transformer are collected and combined with a preset phase shifting angle, closed-loop feedback control is carried out on each conversion unit through control equipment, and the output phase shifting of the DC/DC converter in each conversion unit is controlled, so that the transmission power of the DC/DC converters in the conversion units is equal.
The method for controlling the traction transformer comprises the steps of controlling pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, preset voltage and secondary side voltage of a high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal; and controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal. According to the method, the voltage and the current of each unit in the traction transformer are collected, and the traction transformer is subjected to closed-loop control by combining the preset voltage and the preset phase shift angle, so that the output voltage of the traction transformer is stable, and the running stability of a transmission system of the railway vehicle is improved.
On the basis of the embodiment shown in fig. 2, the invention can also provide a traction transformer control method. Fig. 3 is a flowchart of a traction transformer control method according to a second embodiment of the present invention.
As shown in fig. 3, on the basis of the method shown in fig. 2, step S201 may include:
s301, determining a command voltage according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and the secondary side voltage of the high-frequency transformer in each conversion unit.
Fig. 4 is a control block diagram of a four-quadrant rectifier. As shown in fig. 4, U1，U2，UnThe output voltage of the four-quadrant rectifier of each conversion unit is also called the DC side voltage of the four-quadrant rectifier, n is the number of the conversion units, UrefIs a preset voltage. The control process obtains the command voltage U by controlling the average voltage of the output voltage of the four-quadrant rectifier of each conversion unitcon_av。
Specifically, the average value of the output voltages of the four-quadrant rectifier in each conversion unit and the preset voltage U are determinedrefIs detected.
Obtaining a first current by proportional integral operation of the first voltage difference value
The Proportional Integral operation is performed by a Proportional Integral (PI) controller, such as that shown in fig. 4.
Adjusting the phase of the first current to obtain a second current
Such as phase adjustment by a phase locked loop PLL as shown in fig. 4.
Determining the average value i of the second current and the output current of the four-quadrant rectifier in each conversion unitsThe first current difference.
Carrying out proportional resonance operation on the first current difference value to obtain an output value and an average value U of secondary side voltage values of the high-frequency transformer in each conversion unitsThe difference of (c) is determined as the command voltage, for example, a Proportional resonance operation by a Proportional Resonance (PR) controller as shown in fig. 4.
S302, controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage and the command voltage, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal.
With continued reference to FIG. 4, upon determination of command voltage Ucon_avThen, independent compensation control can be performed according to the command voltage and the unbalance degree of the direct current side capacitor voltage of the four-quadrant rectifier of each conversion unit. When the direct-current side capacitor voltages of the four-quadrant rectifiers of each conversion unit are equal, the output command voltage of each four-quadrant rectifier is Ucon_av(ii) a When the voltage is unbalanced, the deviation degree of the output voltage of each four-quadrant rectifier from the preset voltage is required to be at the command voltage Ucon_avOn the basis of the voltage compensation, compensation is set, namely independent voltage compensation balance control. The purpose of regulating the voltage of the direct current side capacitor is achieved by controlling the absorption of active power by each four-quadrant rectifier.
Specifically, the output voltage of the four-quadrant rectifier in each conversion unit and the preset voltage U are determinedrefIs detected.
The second voltage difference value of each conversion unit is subjected to proportional-integral operation to obtain the first voltage of each conversion unit, for example, proportional-integral operation is performed by a PI controller as shown in fig. 4.
The first voltage of each conversion unit is compared with the command voltage Ucon_avAnd adding to obtain the second voltage of each conversion unit.
The Pulse Width Modulation of the four-quadrant rectifier in each conversion unit is controlled according to the second voltage of each conversion unit, so that the output voltages of the four-quadrant rectifier in each conversion unit are equal, for example, the Pulse Width Modulation is performed by a Sinusoidal Pulse Width Modulation (SPWM) module shown in fig. 4.
Fig. 5 is a control block diagram of the DC/DC converter. Alternatively, step S202 may be implemented by the control flow shown in fig. 5. U shape1，U2，UnThe input voltage of the DC/DC converter of each conversion unit, respectively; i.e. io1，io2，ionAn average value of output currents of the DC/DC converters of each conversion unit; u shapeoThe output voltage of the DC/DC converter of each conversion unit after being connected in parallel is the output voltage of the traction transformer;
and the preset phase shifting angle is used for performing phase shifting control on the DC/DC converter corresponding to each conversion unit.
The input voltage of the DC/DC converter is introduced in the control process as feed-forward control, and the output voltage of the DC/DC converter can be directly compared with the input voltage as the feed-forward control because the transformation ratio of the transformer is 1:1 and the input voltage and the output voltage of the DC/DC converter are equal.
Specifically, a third voltage difference value between the input voltage of the DC/DC converter in each conversion unit and the voltage of the output terminal after the parallel connection is determined.
Obtaining a third current by proportional-integral operation of the third voltage difference value of each conversion unit
The third current
Is a reference current value. Such as proportional integral operation by a PI controller as shown in fig. 5.
Determining the third current
A second current difference value from an output current value of the DC/DC converter in each of the conversion units.
The second current difference of each conversion unit is subjected to proportional-integral operation to obtain a third voltage of each conversion unit, for example, proportional-integral operation is performed by a PI controller as shown in fig. 5.
And controlling the output phase shift of each DC/DC converter according to the third voltage and a preset phase shift angle so as to enable the transmission power of the DC/DC converters in the plurality of conversion units to be equal, for example, performing the output phase shift control through a phase shift control DAB unit as shown in FIG. 5.
According to the traction transformer control method provided by the embodiment, closed-loop control is performed according to the current and the voltage of the four-quadrant rectifier and the DC/DC converter in each conversion unit, the reference voltage, the reference current and the preset phase shifting angle, so that the output voltage of the four-quadrant rectifier in each conversion unit is balanced, the transmission power of the DC/DC converter in each conversion unit is balanced, the output voltage of the traction transformer is stable, and the running stability of a transmission system of a railway vehicle is improved.
Referring to fig. 1, there are a plurality of dc-side supporting capacitors in the four-quadrant rectifier of the traction transformer, each of the supporting capacitors is suspended and independent from another supporting capacitor, and before pulse width modulation rectification, the dc-side capacitors need to be charged through the diodes of the four-quadrant rectifier, so that the capacitor voltage of each unit reaches a value close to 1/n of the power supply voltage, for example, 95% of the power supply voltage, where n is the number of conversion units.
When the support capacitor is charged, the support capacitor is precharged according to the unit sequence from top to bottom in a unit sequence precharging mode. Under the current limiting of the pre-charging resistor, the bypass switch of one conversion unit is switched off at a time to charge the capacitor of the unit, and other units are in a bypass state. And after the current unit finishes precharging, bypassing the current unit, then precharging the next unit, cutting off a precharging resistor until all the units finish precharging, completely switching off bypass switches, and then starting to perform pulse width modulation rectification control on the traction transformer.
Fig. 6 is a schematic structural diagram of a traction transformer control device according to a first embodiment of the present invention. The traction transformer control device is suitable for a traction transformer of a vehicle transmission system, and comprises a plurality of conversion units, wherein the input ends of the conversion units are sequentially connected in series, and the output ends of the conversion units are connected in parallel; each conversion unit comprises a four-quadrant rectifier and a direct current/direct current DC/DC converter, wherein the output end of the four-quadrant rectifier is connected with the input end of the DC/DC converter, the output end of the DC/DC converter is the output end of each conversion unit, and the DC/DC converter comprises a high-frequency transformer.
As shown in fig. 6, the traction transformer control apparatus includes:
the first control module 601 is configured to control pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage, and a secondary side voltage of the high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal.
And a second control module 602, configured to control an output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle, and the voltage of the output end after parallel connection, so that the transmission powers of the DC/DC converters in the plurality of conversion units are equal.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
On the basis of the embodiment shown in fig. 6, the invention can also provide a traction transformer control device. Fig. 7 is a schematic structural diagram of a traction transformer control device according to a second embodiment of the present invention. As shown in fig. 7, based on the apparatus shown in fig. 6, the first control module 601 includes:
a determining unit 701, configured to determine a command voltage according to an output voltage of the four-quadrant rectifier in each converting unit, an output current of the four-quadrant rectifier in each converting unit, a preset voltage, and a secondary side voltage of the high-frequency transformer in each converting unit.
A control unit 702, configured to control pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage, and the command voltage, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal.
The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
The present invention may also provide a control apparatus. Fig. 8 is a block diagram of a control apparatus provided by the present invention. As shown in fig. 8, the control device 80 includes: a memory 81 and a processor 82.
The memory 81 is connected to the processor 82.
The memory 81 is used to store computer programs.
The processor 81 is used to call the computer program stored in the memory 82, so that the control device 80 executes the traction transformer control method according to any of the above embodiments.
The present invention may also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the traction transformer control method described above.
The present invention may also provide a rail vehicle comprising a control system; the control system includes a traction transformer and a control device 80.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The control method of the traction transformer is characterized in that the traction transformer comprises a plurality of conversion units, wherein the input ends of the conversion units are sequentially connected in series, and the output ends of the conversion units are connected in parallel; each conversion unit comprises a four-quadrant rectifier and a direct current/direct current DC/DC converter, the output end of the four-quadrant rectifier is connected with the input end of the DC/DC converter, the output end of the DC/DC converter is the output end of each conversion unit, and the DC/DC converter comprises a high-frequency transformer; the traction transformer control method comprises the following steps:
controlling pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and a secondary side voltage of a high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal;
and controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal.
2. The traction transformer control method according to claim 1, wherein the controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage, and the secondary side voltage of the high frequency transformer in each conversion unit so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal comprises:
determining an instruction voltage according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and the secondary side voltage of the high-frequency transformer in each conversion unit;
and controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage and the command voltage so as to enable the output voltages of the four-quadrant rectifiers in the plurality of conversion units to be equal.
3. The traction transformer control method according to claim 2, wherein the determining the command voltage according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage, and the secondary side voltage of the high frequency transformer in each conversion unit comprises:
determining an average value of output voltages of four-quadrant rectifiers in each conversion unit and a first voltage difference value of the preset voltage;
obtaining a first current after proportional integral operation of the first voltage difference value;
carrying out phase adjustment on the first current to obtain a second current;
determining a first current difference value of the second current and an average value of output currents of the four-quadrant rectifier in each conversion unit;
and determining the difference between the output value of the first current difference after proportional resonance operation and the average value of the secondary side voltage value of the high-frequency transformer in each conversion unit as the command voltage.
4. The traction transformer control method according to claim 2, wherein the controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage and the command voltage so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal comprises:
determining a second voltage difference value between the output voltage of the four-quadrant rectifier in each conversion unit and the preset voltage;
obtaining a first voltage of each conversion unit after proportional integral operation is carried out on the second voltage difference value of each conversion unit;
adding the first voltage of each conversion unit and the instruction voltage to obtain a second voltage of each conversion unit;
controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the second voltage of each conversion unit, so that the output voltages of the four-quadrant rectifier in each conversion unit are equal.
5. The traction transformer control method according to any one of claims 1 to 4, wherein the controlling the output phase shift of the DC/DC converter in each transformation unit according to the input voltage of the DC/DC converter in each transformation unit, the output current of the DC/DC converter in each transformation unit, the preset phase shift angle and the voltage of the output end after parallel connection so that the transmission power of the DC/DC converters in the plurality of transformation units is equal comprises:
determining a third voltage difference value between the input voltage of the DC/DC converter in each conversion unit and the voltage of the output end after parallel connection;
obtaining a third current of each conversion unit after proportional integral operation is carried out on the third voltage difference value of each conversion unit;
determining a second current difference value of the third current of each conversion unit and the output current value of the DC/DC converter in each conversion unit;
obtaining a third voltage of each conversion unit after proportional-integral operation is carried out on the second current difference value of each conversion unit;
and controlling the output phase shift of each DC/DC converter according to the third voltage and a preset phase shift angle, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal.
6. The traction transformer control device is characterized in that the traction transformer comprises a plurality of conversion units, wherein the input ends of the conversion units are sequentially connected in series, and the output ends of the conversion units are connected in parallel; each conversion unit comprises a four-quadrant rectifier and a direct current/direct current DC/DC converter, the output end of the four-quadrant rectifier is connected with the input end of the DC/DC converter, the output end of the DC/DC converter is the output end of each conversion unit, and the DC/DC converter comprises a high-frequency transformer; the traction transformer control device includes:
the first control module is used for controlling pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the output current of the four-quadrant rectifier in each conversion unit, a preset voltage and the secondary side voltage of the high-frequency transformer in each conversion unit, so that the output voltages of the four-quadrant rectifiers in the plurality of conversion units are equal;
and the second control module is used for controlling the output phase shift of the DC/DC converter in each conversion unit according to the input voltage of the DC/DC converter in each conversion unit, the output current of the DC/DC converter in each conversion unit, a preset phase shift angle and the voltage of an output end after parallel connection, so that the transmission power of the DC/DC converters in the plurality of conversion units is equal.
7. The traction transformer control apparatus of claim 6, wherein the first control module comprises:
the determining unit is used for determining the command voltage according to the output voltage of the four-quadrant rectifier in each converting unit, the output current of the four-quadrant rectifier in each converting unit, the preset voltage and the secondary side voltage of the high-frequency transformer in each converting unit;
and the control unit is used for controlling the pulse width modulation of the four-quadrant rectifier in each conversion unit according to the output voltage of the four-quadrant rectifier in each conversion unit, the preset voltage and the command voltage so as to enable the output voltages of the four-quadrant rectifiers in the plurality of conversion units to be equal.
8. A control apparatus, characterized by comprising: a memory and a processor;
the memory is connected with the processor; the memory is used for storing a computer program;
the processor is configured to invoke the memory-stored computer program to cause the control device to perform the method of any of claims 1-5.
9. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when being executed by a processor, carries out the method of any one of claims 1-5.
10. A rail vehicle, comprising a control system; the control system comprises a traction transformer and the control device of claim 8.
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| CN201811631351.7A CN111384867A (en) | 2018-12-29 | 2018-12-29 | Traction transformer control method, device, equipment, storage medium and rail vehicle |
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| CN201811631351.7A CN111384867A (en) | 2018-12-29 | 2018-12-29 | Traction transformer control method, device, equipment, storage medium and rail vehicle |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490638A (en) * | 2013-06-14 | 2014-01-01 | 浙江大学 | Voltage-sharing and power-sharing control method of single-phase multi-module cascading solid-state transformer |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490638A (en) * | 2013-06-14 | 2014-01-01 | 浙江大学 | Voltage-sharing and power-sharing control method of single-phase multi-module cascading solid-state transformer |
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| 王竟飞: "电力电子牵引变压器研究", 《中国优秀硕士学位论文全文数据库工程科技Ⅱ辑》 * |
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