CN109703417B - Harmonic suppression device for direct-current voltage and vehicle traction power supply device - Google Patents
Harmonic suppression device for direct-current voltage and vehicle traction power supply device Download PDFInfo
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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Abstract
The embodiment of the invention provides a harmonic suppression device of direct-current voltage and a vehicle traction power supply device, wherein the harmonic suppression device comprises: the system comprises a diode rectifier unit, an alternating current signal acquisition module, a direct current signal acquisition module, a central controller and a four-quadrant converter unit; the input end of the diode rectifier unit, the input end of the alternating current signal acquisition module and the input end of the four-quadrant converter unit are all used for receiving three-phase alternating current; the output end of the diode rectifier unit and the output end of the four-quadrant converter unit are connected with the input end of the direct current signal acquisition module; the output end of the direct current signal acquisition module and the output end of the alternating current signal acquisition module are both connected with the input end of the central controller, and the output end of the central controller is connected with the input end of the four-quadrant converter set. According to the embodiment of the invention, the three-phase alternating current is processed, the direct-current voltage with the harmonic wave suppressed is output, and the quality of electric energy in a power supply system in a rail transit vehicle is improved.
Description
Technical Field
The embodiment of the invention relates to the field of rail transit, in particular to a harmonic suppression device of direct-current voltage and a vehicle traction power supply device.
Background
The rail transit vehicle (such as a subway) needs a power supply system to drive and operate, a power supply device in the power supply system comprises a diode rectifier unit, and the diode rectifier unit processes three-phase Alternating Current (AC) power input into the power supply device and outputs DC voltage required by driving the rail transit vehicle to operate. In the prior art, a 24-pulse rectifier unit is mostly adopted in a diode rectifier unit, and when the 24-pulse rectifier unit converts three-phase alternating current input into a power supply device into direct current voltage required by driving a rail transit vehicle to operate, 24 times or more harmonic waves exist in the direct current voltage, and the harmonic waves reduce the quality of electric energy in a power supply system in the rail transit vehicle.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a harmonic suppression apparatus for dc voltage and a vehicle traction power supply apparatus that overcome or at least partially solve the above problems.
According to a first aspect of embodiments of the present invention, there is provided a harmonic suppression apparatus for a direct current voltage, the apparatus including: the system comprises a diode rectifier unit, an alternating current signal acquisition module, a direct current signal acquisition module, a central controller and a four-quadrant converter unit; the input end of the diode rectifier unit, the input end of the alternating current signal acquisition module and the input end of the four-quadrant converter unit are all used for receiving three-phase alternating current; the output end of the diode rectifier unit and the output end of the four-quadrant converter unit are connected with the input end of the direct current signal acquisition module; the output end of the direct current signal acquisition module and the output end of the alternating current signal acquisition module are both connected with the input end of the central controller, and the output end of the central controller is connected with the input end of the four-quadrant converter set; the diode rectifier unit is used for processing the three-phase alternating current and outputting direct-current voltage obtained after processing; the direct current signal acquisition module is used for acquiring direct current voltage signals at a direct current side and outputting the direct current voltage signals; the alternating current signal acquisition module is used for acquiring information of three-phase alternating current and outputting an acquired alternating current voltage signal and an acquired alternating current signal; the central controller is used for processing the alternating voltage signal, the alternating current signal and the direct current voltage signal and outputting a driving pulse obtained after processing; the four-quadrant converter set is used for processing the driving pulse and the three-phase alternating current and outputting direct-current voltage.
According to a second aspect of embodiments of the present invention, there is provided a vehicle traction power supply apparatus comprising a harmonic suppression apparatus for dc voltage as provided in any one of the various possible implementations of the first aspect.
According to the harmonic suppression device for the direct-current voltage and the vehicle traction power supply device, the diode rectifier unit and the four-quadrant converter unit are combined together to process the three-phase alternating current and output the direct-current voltage with the suppressed harmonic, the problem that the cable loss of a power supply system in a rail transit vehicle is increased due to the harmonic, so that current leakage in the power supply system is caused is solved, and the quality of electric energy in the power supply system in the rail transit 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 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 invention, and that for a person skilled in the art, other drawings can be derived from these without inventive effort.
Fig. 1 is a schematic view of a rail transit vehicle scene provided by an embodiment of the present invention;
fig. 2 is a circuit block diagram of a harmonic suppression apparatus for dc voltage according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a diode rectifier unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a diode rectifier unit according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a central controller according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a first processing module in the central controller according to an embodiment of the present invention;
fig. 7 is a schematic diagram illustrating generation of a voltage command signal in a first processing module according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of a second processing module in the central controller according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a third processing module in the central controller according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a four-quadrant converter group according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a four-quadrant converter set according to another embodiment of 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 described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, 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.
In order to solve the problem that the quality of electric energy in a power supply system in a rail transit vehicle is reduced due to harmonic waves existing in direct-current voltage in the prior art, the embodiment of the invention provides a harmonic wave suppression device for the direct-current voltage. Referring to fig. 1, a power supply system of a rail transit vehicle includes a three-phase ac power grid, a power supply device, and a dc power grid, wherein a harmonic suppression device of a dc voltage is provided in the power supply device.
In a power supply system of a rail transit vehicle, a three-phase alternating current input interface is used for receiving three-phase alternating current in a three-phase alternating current power grid. The three-phase alternating current network is arranged in a path through which the rail transit vehicle passes. The harmonic suppression device for the direct-current voltage processes the three-phase alternating current and outputs the direct-current voltage with suppressed harmonics. The harmonic suppressed direct current voltage is output to a part of the rail transit vehicle which needs to be supplied with power, such as maintaining the operation of the rail transit vehicle, illuminating lamps and the like.
Therefore, the direct-current voltage harmonic suppression device in the power supply device can process three-phase alternating current, output direct-current voltage containing harmonic waves, process direct-current voltage containing harmonic waves, and output direct-current voltage without harmonic waves, so that the problem that the harmonic waves increase cable loss of a power supply system in a rail transit vehicle to further cause current leakage in the power supply system is solved, and the quality of electric energy in the power supply system in the rail transit vehicle is improved.
Referring to fig. 2, the harmonic suppression apparatus for dc voltage includes: the system comprises a diode rectifier unit 22, an alternating current signal acquisition module 23, a direct current signal acquisition module 24, a central controller 25 and a four-quadrant converter unit 26; the input end of the diode rectifier unit 22, the input end of the alternating current signal acquisition module 23 and the input end of the four-quadrant converter unit 26 are all used for receiving three-phase alternating current; the output end of the diode rectifier unit 22 and the output end of the four-quadrant converter unit 26 are connected with the input end of the direct current signal acquisition module 24; the output end of the direct current signal acquisition module 24 and the output end of the alternating current signal acquisition module 23 are both connected with the input end of a central controller 25, and the output end of the central controller 25 is connected with the input end of a four-quadrant converter set 26; the diode rectifier unit 22 is used for processing the three-phase alternating current and outputting a direct current voltage obtained after the processing; the direct current signal acquisition module 24 is configured to acquire a direct current voltage signal at a direct current side and output the direct current voltage signal; the alternating current signal acquisition module 23 is configured to perform information acquisition on three-phase alternating current, and output an acquired alternating current voltage signal and an acquired alternating current signal; the central controller 25 is configured to process the ac voltage signal, the ac current signal, and the dc voltage signal, and output a driving pulse obtained after the processing; the four-quadrant converter set 26 is used for processing the driving pulse and the three-phase alternating current and outputting direct-current voltage.
Specifically, in the harmonic suppression device for dc voltage, the input end of the diode rectifier unit 22, the input end of the ac signal acquisition module 23, and the input end of the four-quadrant converter unit 26 are respectively connected to the output end of the three-phase ac module 21. The input end of the direct current signal acquisition module 24 is connected with the output end of the diode rectifier unit 22 and the output end of the four-quadrant converter unit 26, respectively, and the output end of the direct current signal acquisition module 24 is connected with the input end of the central controller 25. The input end of the central controller 25 is connected to the output end of the ac signal acquisition module 23 and the output end of the dc signal acquisition module 24, respectively, and the output end of the central controller 25 is connected to the input end of the four-quadrant inverter unit 26. The output end of the four-quadrant converter set 26 is the output end 17 of the harmonic suppression device for the direct-current voltage.
The three-phase alternating current module 21 is a part of a three-phase alternating current power grid, and the three-phase alternating current module 21 outputs three-phase alternating current U; the diode rectifier unit 22 may be a 24-pulse diode rectifier unit; the central controller 25 may be implemented by a combination of software and hardware. In practical applications, the three-phase alternating current U output by the three-phase alternating current module 21 is processed by the diode rectifier unit 22 to output a direct current voltage including harmonic components. The dc voltage contains dc components, harmonic components of 24 and multiples thereof.
The ac signal acquisition module 23 may include an ac voltage sensor and an ac current sensor. This alternating voltage sensor can gather the three-phase alternating current, and the output carries the alternating voltage signal of three-phase alternating current U information. The alternating current signal acquisition module can acquire three-phase alternating current and output an alternating current signal carrying three-phase alternating current U information.
The dc signal acquisition module 24 acquires information on the dc voltage including the harmonic component output from the diode rectifier unit 22 and the dc voltage with the harmonic suppressed output from the four-quadrant inverter unit 26, and outputs a dc voltage signal. It should be noted that, since the diode rectifier unit 22 and the four-quadrant converter unit 26 are connected in parallel, the dc voltage output by the diode rectifier unit 22 and the dc voltage output by the four-quadrant converter unit 26 are both dc voltages on the dc side, and therefore, the dc voltage signal collected by the dc signal collection module 24 from the output end of the diode rectifier unit 22 and the dc voltage signal collected by the four-quadrant converter unit 26 are the same dc voltage signal.
The central controller 25 processes the input ac voltage signal, ac current signal, and dc voltage signal, and outputs a drive pulse. The four-quadrant inverter unit 26 operates according to the drive pulse and outputs a dc voltage.
The following describes the operation of the harmonic suppression device for dc voltage in detail:
when the three-phase alternating current U in the three-phase alternating current power grid is adopted to control the operation and illumination of the rail transit vehicle; the three-phase alternating current U is input to the diode rectifier unit 22, and the diode rectifier unit 22 processes the three-phase alternating current U and outputs a direct current voltage, which includes a direct current component and a harmonic component.
The alternating current signal acquisition module 23 acquires information of the three-phase alternating current U and outputs an alternating current voltage signal and an alternating current signal.
The dc signal collection module 24 collects information about the dc voltage (including harmonic) output by the diode rectifier unit 22 and the voltage (with harmonic suppressed) output by the four-quadrant converter unit 26 (since the diode rectifier unit 22 and the four-quadrant converter unit 26 are connected in parallel, the two voltage signals are the same dc voltage signal and both are dc voltage signals on the dc side), and outputs a dc voltage signal.
The central controller 25 processes the ac voltage signal, the ac current signal, and the dc voltage signal, and outputs a drive pulse.
The four-quadrant inverter unit 26 processes the drive pulse and the three-phase alternating current U, and outputs a direct current voltage with harmonic suppressed.
According to the harmonic suppression device for the direct-current voltage, provided by the embodiment of the invention, the diode rectifier unit and the four-quadrant converter unit are combined together to process the three-phase alternating current and output the direct-current voltage with the suppressed harmonic, so that the problem that the cable loss of a power supply system in a rail transit vehicle is increased due to the harmonic, and further the current leakage in the power supply system is caused is solved, and the quality of electric energy in the power supply system in the rail transit vehicle is improved.
Further, harmonic waves contained in the direct-current voltage increase the loss of the three-winding phase-shifting rectifier transformer, and simultaneously cause the diode rectifier unit to generate torque ripple, thereby causing adverse effects on the stability of the diode rectifier unit. By utilizing the harmonic suppression device for the direct-current voltage, harmonic components contained in the direct-current voltage can be suppressed, so that the loss of the three-winding phase-shifting rectifier transformer is reduced, and the stability of the diode rectifier unit is improved.
Based on the contents of the above-described embodiment, as an alternative embodiment, the central controller 25 includes a first processing module 51, a second processing module 52, and a third processing module 53; the input end of the first processing module 51 is connected with the output end of the direct current signal acquisition module 24; the input end of the second processing module 52 is connected with the output end of the first processing module 51 and the output end of the direct current signal acquisition module 24 respectively; the input end of the third processing module 53 is connected to the output end of the second processing module 52 and the output end of the ac signal acquisition module 23 respectively; the output end of the third processing module 53 is connected with the input end of the four-quadrant converter set 26; the first processing module 51 is configured to process the direct-current voltage signal and a preset voltage command, and output a voltage command signal obtained after the processing; the second processing module 52 is configured to process the voltage command signal and the dc voltage signal, and output a current command signal obtained after the processing; the third processing module 53 is configured to process the current instruction signal, the ac voltage signal, and the ac current signal, and output a driving pulse obtained after the processing.
Specifically, referring to fig. 5, the central controller 25 includes: the device comprises a first processing module 51, a second processing module 52 and a third processing module 53, wherein the input end of the first processing module 51 is connected with the output end of the direct current signal acquisition module 24; the input end of the second processing module 52 is respectively connected with the output end of the first processing module 51 and the output end of the direct current signal acquisition module 24; the input end of the third processing module 53 is respectively connected with the output end of the second processing module 52 and the output end of the alternating current signal acquisition module 23; the output of the third processing module 53 is connected to the input of the four-quadrant inverter group 26.
The configurations of the first processing module 51, the second processing module 52, and the third processing module 53 will be described in detail below.
Based on the content of the above-described embodiment, as an alternative embodiment, the first processing module 51 includes: the device comprises a filter, a first adder, an negation module and a second adder; the input end of the filter is connected with the output end of the direct current signal acquisition module 24; the input end of the first adder is respectively connected with the output end of the direct current signal acquisition module 24 and the output end of the filter; the output end of the first adder is connected with the input end of the negation module, the output end of the negation module is connected with the input end of the second adder, and the output end of the second adder is connected with the input end of the second processing module; the filter is used for processing the direct-current voltage signal and outputting a direct-current component voltage signal obtained after the processing; the first adder is used for summing the reverse voltage signal of the direct current component voltage signal and the direct current voltage signal and outputting a harmonic component in the direct current voltage signal obtained after processing; the negation module is used for negating the harmonic component and outputting the opposite harmonic component of the harmonic component obtained after the negation processing; and the second adder is used for summing the opposite harmonic component and a preset voltage command and outputting a voltage command signal obtained after processing.
Specifically, referring to fig. 6, the first processing module 51 includes a filter and a first signal processing unit, wherein an input end of the filter is connected with an output end of the direct current signal acquisition module 24; the input end of the first signal processing unit is respectively connected with the output end of the direct current signal acquisition module 24 and the output end of the filter; the output of the first signal processing unit is connected to the input of the second processing module 52. The first signal processing unit may include an adder and an inverting module.
On the basis of the embodiment provided in fig. 6, the following is a first signal processing unit comprising: the first adder, the negation module and the second adder are taken as examples to describe in detail the processing flow of the voltage signal in the first processing module 51, specifically, please refer to the embodiment provided in fig. 7.
Fig. 7 is a schematic diagram illustrating voltage command signal generation in the first processing module according to an embodiment of the present invention, and specifically, referring to fig. 7, the dc signal acquisition module 24 outputs a dc voltage signal u containing a harmonic component*The first adder outputs a DC component voltage signal and a DC voltage signal u opposite to the DC component voltage signal*Processing the signal to output a DC voltage signal u*The harmonic component in the harmonic component is processed by the negation module, and the opposite of the harmonic component is outputThe harmonic component, the opposite harmonic component, and a voltage command preset in the central controller 25 are processed by the second adder, and a voltage command signal u is output.
Based on the content of the foregoing embodiment, as an alternative embodiment, the second processing module 52 includes: the second signal processing unit, the PI regulator and the first LIM amplitude limiter; the input end of the second signal processing unit is connected with the output end of the first processing module and the output end of the direct current signal acquisition module 24; the output end of the second signal processing unit is connected with the input end of a PI (proportional integral) regulator, and the output end of the PI regulator is connected with the input end of a first LIM amplitude limiter; the output end of the first LIM amplitude limiter is connected with the input end of the third processing module; the second signal processing unit is used for processing the direct-current voltage signal and the voltage instruction and outputting a direct-current voltage deviation signal obtained after processing; the PI regulator is used for processing the direct-current voltage deviation signal and outputting a third direct-current voltage signal; the first LIM amplitude limiter is used for processing the third direct-current voltage signal and outputting a current instruction signal.
Specifically, the second processing module 52 includes a second signal processing unit, a PI regulator, and a first LIM limiter, wherein an input end of the second signal processing unit is connected to an output end of the first processing module 51 and an output end of the dc signal acquisition module 24, respectively; the output end of the second signal processing unit is connected with the input end of a PI (proportional integral) regulator, and the output end of the PI regulator is connected with the input end of a first LIM amplitude limiter; the output of the first LIM limiter is connected to the input of the third processing module 53.
The second signal processing unit is one of an adder and a comparator. The PI regulator can realize the non-static tracking of the direct current voltage deviation signal and output a required direct current voltage signal. The LIM limiter may generate a required voltage command signal according to an input current command signal or generate a required current command signal according to an input voltage command signal. The first LIM limiter may generate a required current command signal according to an input voltage command signal.
The structure of the second processing module 52 will be described in detail below by taking the example that the second signal processing unit includes an adder, and specifically, please refer to the embodiment shown in fig. 8.
Fig. 8 is a schematic structural diagram of a second processing module 52 in the central controller according to an embodiment of the present invention, please refer to fig. 8, in which the second signal processing unit outputs a dc voltage signal u to the dc signal acquisition module 24*And the voltage command signal u is processed to output a direct current voltage deviation signal delta u, the PI regulator processes the direct current voltage deviation signal delta u and outputs a required direct current voltage signal u ', and the first LIM amplitude limiter processes the required direct current voltage signal u ' and outputs the processed direct current voltage signal u ' to the current command signal
Based on the content of the foregoing embodiment, as an alternative embodiment, the third processing module includes: the device comprises a park transformation module, a third adder, a fourth adder, an SPLL phase-locked loop, a d-axis current loop, a q-axis current loop, a second LIM amplitude limiter, a third LIM amplitude limiter and a PWM (pulse width modulation) pulse width modulator; the input end of the SPLL phase-locked loop is connected with the output end of the alternating current signal acquisition module, and the input end of the park transformation module is connected with the output end of the alternating current signal acquisition module and the output end of the SPLL phase-locked loop; the input end of the third adder is connected with the output end of the second processing module and the output end of the park transformation module, the output end of the third adder is connected with the input end of the d-axis current loop, the output end of the d-axis current loop is connected with the input end of the second LIM amplitude limiter, and the output end of the second LIM amplitude limiter is connected with the input end of the PWM; the input end of the fourth adder is connected with the output end of the park transformation module, the output end of the fourth adder is connected with the input end of the q-axis current loop, the output end of the q-axis current loop is connected with the input end of the third LIM amplitude limiter, and the output end of the third LIM amplitude limiter is connected with the input end of the PWM; the SPLL phase-locked loop is used for processing the alternating voltage signal and outputting a phase value of the three-phase alternating voltage signal; the park transformation module is used for processing the alternating current signal and the phase value to obtain a first current signal and a second current signal which are transformed into a static (d, q) coordinate system; the third adder is used for processing the first current signal and the current instruction signal and outputting a first processing result; the d-axis current loop and the second LIM amplitude limiter sequentially process the first processing result and input the output first voltage signal to the PWM; the fourth adder is used for processing the second current signal and a preset 0 value and outputting a second processing result; the q-axis current loop and the third LIM amplitude limiter sequentially process the second processing result, and the output second voltage signal is input to the PWM; the PWM is used for processing the first voltage signal and the second voltage signal and outputting a driving pulse obtained after processing.
Specifically, the third processing module 53 includes a third signal processing unit, a fourth signal processing unit, a SPLL phase-locked loop, a d-axis current loop, a q-axis current loop, a second LIM limiter, a third LIM limiter, and a PWM pulse modulator. The input end of the third signal processing unit is connected to the output end of the second processing module 52, the output end of the alternating current signal acquisition module 24 and the output end of the SPLL phase-locked loop, respectively, and the input end of the SPLL phase-locked loop is connected to the output end of the alternating current signal acquisition module 23; the output end of the third signal processing unit is connected with the input end of a d-axis current loop, the output end of the d-axis current loop is connected with the input end of a second LIM amplitude limiter, and the output end of the second LIM amplitude limiter is connected with the input end of a PWM (pulse width modulation) device; the input end of the fourth signal processing unit is respectively connected with the output end of the alternating current signal acquisition module 23 and the output end of the SPLL phase-locked loop; the output end of the fourth signal processing unit is connected with the input end of the q-axis current loop, the output end of the q-axis current loop is connected with the input end of a third LIM amplitude limiter, and the output end of the third LIM amplitude limiter is connected with the input end of the PWM.
The third signal processing unit and the fourth signal processing unit both comprise an adder and a park transformation module. The structure of the third processing module 53 will be described in detail below by taking as an example that the third signal processing unit and the fourth signal processing unit both include an adder and a park transformation module, and specifically, please refer to the embodiment shown in fig. 9.
FIG. 9 is a block diagram of a third processing module in the central controller according to an embodiment of the present inventionSpecifically, referring to fig. 9, in fig. 9, the abc/dq module is a park transformation module, and the park transformation module transforms the ac voltage signal u output by the ac signal acquisition module 23a,b,cAC current signal ia,b,cCurrent signal i transformed into a stationary (d, q) coordinate systemd、iqAnd outputs a current signal id、iq。
In the embodiment provided in fig. 9, the ac signal acquisition module 23 outputs an ac voltage signal ua,b,cAnd an alternating current signal ia,b,cSPLL phase-locked loop versus input AC voltage signal ua,b,cProcessing is carried out, and a phase value theta of the three-phase alternating voltage signal is output; abc/dq module pair input alternating current signal ia,b,cAnd processing the phase value theta of the alternating current to output a current signal id、iq(ii) a Current signal idAnd a current command signal
Sequentially processed by an adder, a d-axis current loop and a second LIM amplitude limiter to output a voltage signal UdFinally, U is putdInputting a PWM pulse width modulator; current signal iqAnd 0 value preset in the central controller 25 are processed by an adder, a q-axis current loop and a third LIM amplitude limiter in sequence to output a voltage signal UqFinally, U is putqInputting a PWM pulse width modulator; PWM pulse width modulator to voltage signal UdAnd UqAnd processing and outputting the driving pulse.
It should be noted that the second LIM limiter processes the output of the d-axis current loop and outputs a voltage signal UdThe third LIM limiter processes the output of the q-axis current loop and outputs a voltage signal Uq. Wherein, the PWM pulse modulator pair UdAnd UqProcessing is performed to output a series of pulses of equal amplitude, i.e., drive pulses.
Based on the content of the foregoing embodiment, as an alternative embodiment, the four-quadrant converter set 26 includes: a double winding transformer 101, a first four-quadrant converter 102 and a second four-quadrant converter 103; the input end of the double-winding transformer 101 is used for receiving three-phase alternating current; the input end of the first four-quadrant converter 102 is respectively connected with the output end of the double-winding transformer 101 and the output end of the central controller 25; the output end of the first four-quadrant converter 102 is connected with the input end of the direct current signal acquisition module 24; the input end of the second four-quadrant converter 103 is respectively connected with the output end of the double-winding transformer 101 and the output end of the central controller 25; the output end of the second four-quadrant converter 102 is connected with the input end of the direct current signal acquisition module 24.
Specifically, referring to fig. 10, the four-quadrant converter set 26 includes a double-winding transformer 101, a first four-quadrant converter 102 and a second four-quadrant converter 103, wherein an input end of the double-winding transformer 101 is connected with an output end of the three-phase ac power module 21; the input end of the first four-quadrant converter 102 is respectively connected with the output end of the double-winding transformer 101 and the output end of the central controller 25; the output end of the first four-quadrant converter 102 is connected with the input end of the direct current signal acquisition module 24; the input end of the second four-quadrant converter 103 is respectively connected with the output end of the double-winding transformer 101 and the output end of the central controller 25; the output end of the second four-quadrant converter 103 is connected with the input end of the direct current signal acquisition module 24.
Based on the content of the foregoing embodiment, as an alternative embodiment, the four-quadrant converter set 26 further includes: a first inductor 111 and a second inductor 112, wherein one end of the first inductor 111 is connected to the output end of the double-winding transformer, and the other end of the first inductor 111 is connected to the input end of the first four-quadrant converter 102; one end of the second inductor 112 is connected to the output end of the double-winding transformer, and the other end of the second inductor 112 is connected to the input end of the second four-quadrant converter 103.
Specifically, referring to fig. 11, the four-quadrant converter group further includes a first inductor 111 and a second inductor 112, wherein one end of the first inductor 111 is connected to the output end of the double-winding transformer, and the other end of the first inductor 111 is connected to the input end of the first four-quadrant converter 102; one end of the second inductor 112 is connected to the output end of the double-winding transformer 102, and the other end of the second inductor 112 is connected to the input end of the second four-quadrant converter 103.
It should be noted that the first four-quadrant converter 102 further includes 6 Insulated Gate Bipolar Transistors (IGBTs), 6 diodes, and 1 capacitor. In the first four-quadrant converter 102, the cathodes of the 6 diodes are respectively connected to the collectors of the 6 IGBTs, the anodes of the 6 diodes are respectively connected to the emitters of the 6 IGBTs, the gates of the 6 IGBTs are connected to the output terminal of the signal processing module 25, the anode of the capacitor is connected to the collector of the IGBT at the point m, and the cathode of the capacitor is connected to the emitter of the IGBT at the point n.
The first four-quadrant current transformer 102 and the second four-quadrant current transformer 103 are completely the same in structure and connection mode. The first inductor 111 and the second inductor 112 are each formed by three inductor coils. It should be noted that the double-winding transformer 101 performs voltage reduction processing on the three-phase alternating current U, so that the voltage of the three-phase alternating current U is reduced to the voltage required by the first four-quadrant converter 102 and the second four-quadrant converter 103.
In practical application, the PWM pulse width modulator is used for inputting UdAnd UqAnd the four-quadrant converter set 26 processes the driving pulse and the three-phase alternating current and outputs direct-current voltage with harmonic suppressed.
Based on the content of the foregoing embodiment, as an alternative embodiment, the diode rectifier set 22 includes: a three-winding phase-shifting rectifier transformer 31 and a diode rectifier bridge 32; the input end of the three-winding phase-shifting rectifier transformer 31 is used for receiving three-phase alternating current; the output end of the three-winding phase-shifting rectifier transformer 31 is connected with the input end of the diode rectifier bridge 32, and the output end of the diode rectifier bridge 32 is connected with the input end of the direct current signal acquisition module 24.
Specifically, referring to fig. 3, diode rectifier group 22 includes a three-winding phase-shifting rectifier transformer 31 and a diode rectifier bridge 32. On the basis of the embodiment provided in fig. 3, please refer to the embodiment provided in fig. 4, the diode rectifier set includes: the 2 three-winding phase-shifting rectifier transformers comprise 41 and 42, and the 4 diode rectifier bridges comprise 411, 412, 413 and 414, wherein the input ends of the 2 three-winding phase-shifting rectifier transformers 41 and 42 are connected with the output end of the three-phase alternating current module 21; the output terminal of the three-winding phase-shifting rectifier transformer 41 is connected to the input terminals of the 2 diode rectifier bridges 411 and 412, and the output terminal of the three-winding phase-shifting rectifier transformer 42 is connected to the input terminals of the 2 diode rectifier bridges 413 and 414. The output ends of the 4 diode rectifier bridges are connected in parallel and connected with the input end of the direct current signal acquisition module 24.
The primary sides of the 2 three-winding phase-shifting rectifier transformers 41 and 42 can be connected in an edge-extending delta connection manner. The secondary sides of the 2 three-winding phase-shifting rectifier transformers 41 and 42 can be connected in star and angle respectively. The phase-shifting type rectifier transformer 41 with three windings shifts phase by +7.5 degrees, and the phase-shifting type rectifier transformer 42 with three windings shifts phase by-7.5 degrees. The outputs of the 4 diode rectifier bridges 411, 412, 413 and 414 may be connected together in parallel.
In practical applications, the three-winding phase-shifting rectifier transformer 41 steps down the input three-phase ac power U to the voltages required by the diode rectifier bridges 411 and 412, and the three-winding phase-shifting rectifier transformer 42 steps down the input three-phase ac power U to the voltages required by the diode rectifier bridges 413 and 414.
It should be noted that the output end of the diode rectifier bridges 411, 412, 413, and 414 connected in parallel outputs a dc voltage udD.c. voltage udThe harmonic component contains direct current component, 24 and its multiple.
According to the harmonic suppression device for the direct-current voltage, when the three-phase alternating current U in the three-phase alternating current power grid is adopted to control the operation and illumination of the rail transit vehicle, the three-phase alternating current U is input into the diode rectifier unit, the diode rectifier unit processes the three-phase alternating current U and outputs the direct-current voltage, and the direct-current voltage comprises a direct-current component and a harmonic component; meanwhile, the alternating current signal acquisition module acquires information of the three-phase alternating current U and outputs an alternating current voltage signal and an alternating current signal; the direct current signal acquisition module outputs and acquires a direct current voltage signal; the central controller processes the alternating voltage signal, the alternating current signal and the direct current voltage signal and outputs a driving pulse; the direct current signal acquisition module acquires information of direct current voltage (including harmonic) output by the diode rectifier unit and voltage (harmonic suppressed) output by the four-quadrant converter unit and outputs a direct current voltage signal; the four-quadrant converter set processes the driving pulse and the three-phase alternating current U and outputs direct-current voltage with harmonic suppressed. The quality of the electric energy in the power supply system in the rail transit vehicle is improved.
The embodiment of the invention provides a vehicle traction power supply device which comprises a direct-current voltage harmonic suppression device provided by any one of the embodiments.
It should be noted that, the structure and the implementation principle of the harmonic suppression device for the dc voltage included in the vehicle traction power supply device may refer to the embodiments shown in fig. 1 to fig. 11, and details are not repeated herein.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. An apparatus for harmonic suppression of a dc voltage, comprising: the system comprises a diode rectifier unit, an alternating current signal acquisition module, a direct current signal acquisition module, a central controller and a four-quadrant converter unit;
the input end of the diode rectifier unit, the input end of the alternating current signal acquisition module and the input end of the four-quadrant converter unit are all used for receiving three-phase alternating current; the output end of the diode rectifier unit and the output end of the four-quadrant converter unit are connected with the input end of the direct current signal acquisition module; the output end of the direct current signal acquisition module and the output end of the alternating current signal acquisition module are both connected with the input end of the central controller, and the output end of the central controller is connected with the input end of the four-quadrant converter set;
the diode rectifier unit is used for processing the three-phase alternating current and outputting direct-current voltage obtained after processing;
the direct current signal acquisition module is used for acquiring a direct current voltage signal at a direct current side and outputting the direct current voltage signal;
the alternating current signal acquisition module is used for acquiring information of the three-phase alternating current and outputting an acquired alternating current voltage signal and an acquired alternating current signal;
the central controller is used for processing the alternating voltage signal, the alternating current signal and the direct current voltage signal and outputting a driving pulse obtained after processing;
the four-quadrant converter set is used for processing the driving pulse and the three-phase alternating current and outputting the direct-current voltage;
wherein the central controller comprises: the system comprises a first processing module, a second processing module and a third processing module;
the input end of the first processing module is connected with the output end of the direct current signal acquisition module; the input end of the second processing module is respectively connected with the output end of the first processing module and the output end of the direct current signal acquisition module; the input end of the third processing module is respectively connected with the output end of the second processing module and the output end of the alternating current signal acquisition module; the output end of the third processing module is connected with the input end of the four-quadrant converter set;
the first processing module is used for processing the direct-current voltage signal and a preset voltage instruction and outputting a voltage instruction signal obtained after processing;
the second processing module is used for processing the voltage command signal and the direct-current voltage signal and outputting a current command signal obtained after processing;
the third processing module is used for processing the current instruction signal, the alternating voltage signal and the alternating current signal and outputting the driving pulse obtained after processing;
wherein the first processing module comprises: the device comprises a filter, a first adder, an negation module and a second adder;
the input end of the filter is connected with the output end of the direct current signal acquisition module; the input end of the first adder is respectively connected with the output end of the direct current signal acquisition module and the output end of the filter; the output end of the first adder is connected with the input end of the negation module, the output end of the negation module is connected with the input end of the second adder, and the output end of the second adder is connected with the input end of the second processing module;
the filter is used for processing the direct current voltage signal and outputting a direct current component voltage signal obtained after processing;
the first adder is used for summing the reverse voltage signal of the direct current component voltage signal and the direct current voltage signal and outputting a harmonic component in the direct current voltage signal obtained after processing;
the negation module is used for negating the harmonic component and outputting an opposite harmonic component of the harmonic component obtained after the negation processing;
and the second adder is used for summing the opposite harmonic component and a preset voltage command and outputting a voltage command signal obtained after processing.
2. The harmonic suppression apparatus for dc voltage according to claim 1, wherein the second processing module comprises: the second signal processing unit, the PI regulator and the first LIM amplitude limiter;
the input end of the second signal processing unit is connected with the output end of the first processing module and the output end of the direct current signal acquisition module; the output end of the second signal processing unit is connected with the input end of the PI regulator, and the output end of the PI regulator is connected with the input end of the first LIM amplitude limiter; the output end of the first LIM amplitude limiter is connected with the input end of the third processing module;
the second signal processing unit is used for processing the direct-current voltage signal and the voltage instruction and outputting a direct-current voltage deviation signal obtained after processing;
the PI regulator is used for processing the direct-current voltage deviation signal and outputting a third direct-current voltage signal;
and the first LIM amplitude limiter is used for processing the third direct-current voltage signal and outputting the current instruction signal.
3. The harmonic suppression device of a dc voltage according to claim 1, wherein the third processing module comprises: the device comprises a park transformation module, a third adder, a fourth adder, an SPLL phase-locked loop, a d-axis current loop, a q-axis current loop, a second LIM amplitude limiter, a third LIM amplitude limiter and a PWM (pulse width modulation) pulse width modulator;
the input end of the SPLL phase-locked loop is connected with the output end of the alternating current signal acquisition module, and the input end of the park transformation module is connected with the output end of the alternating current signal acquisition module and the output end of the SPLL phase-locked loop;
the input end of the third adder is connected with the output end of the second processing module and the output end of the park transformation module, the output end of the third adder is connected with the input end of the d-axis current loop, the output end of the d-axis current loop is connected with the input end of a second LIM amplitude limiter, and the output end of the second LIM amplitude limiter is connected with the input end of the PWM;
the input end of the fourth adder is connected with the output end of the park transformation module, the output end of the fourth adder is connected with the input end of the q-axis current loop, the output end of the q-axis current loop is connected with the input end of the third LIM amplitude limiter, and the output end of the third LIM amplitude limiter is connected with the input end of the PWM pulse width modulator;
the SPLL phase-locked loop is used for processing the alternating voltage signal and outputting a phase value of a three-phase alternating voltage signal;
the park transformation module is used for processing the alternating current signal and the phase value to obtain a first current signal and a second current signal which are transformed into a static (d, q) coordinate system;
the third adder is used for processing the first current signal and the current instruction signal and outputting a first processing result; the d-axis current loop and the second LIM amplitude limiter sequentially process the first processing result, and input an output first voltage signal to the PWM;
the fourth adder is used for processing the second current signal and a preset 0 value and outputting a second processing result; the q-axis current loop and the third LIM amplitude limiter sequentially process the second processing result, and input an output second voltage signal to the PWM;
the PWM pulse width modulator is used for processing the first voltage signal and the second voltage signal and outputting the driving pulse obtained after processing.
4. The harmonic suppression device for dc voltage according to claim 1, wherein the four-quadrant inverter group comprises: the double-winding transformer, the first four-quadrant converter and the second four-quadrant converter; the input end of the double-winding transformer is used for receiving the three-phase alternating current;
the input end of the first four-quadrant converter is respectively connected with the output end of the double-winding transformer and the output end of the central controller; the output end of the first four-quadrant converter is connected with the input end of the direct current signal acquisition module;
the input end of the second four-quadrant converter is respectively connected with the output end of the double-winding transformer and the output end of the central controller; and the output end of the second four-quadrant converter is connected with the input end of the direct current signal acquisition module.
5. The harmonic suppression device for dc voltage according to claim 4, wherein the four-quadrant inverter group further comprises: a first inductance and a second inductance, wherein,
one end of the first inductor is connected with the output end of the double-winding transformer, and the other end of the first inductor is connected with the input end of the first four-quadrant converter;
one end of the second inductor is connected with the output end of the double-winding transformer, and the other end of the second inductor is connected with the input end of the second four-quadrant converter.
6. The harmonic suppression device for dc voltage according to claim 1, wherein the diode rectifier unit comprises: a three-winding phase-shifting rectifier transformer and a diode rectifier bridge;
the input end of the three-winding phase-shifting rectifier transformer is used for receiving the three-phase alternating current;
the output end of the three-winding phase-shifting rectifier transformer is connected with the input end of the diode rectifier bridge, and the output end of the diode rectifier bridge is connected with the input end of the direct current signal acquisition module.
7. The harmonic suppression device for dc voltage according to claim 1, wherein the output terminal of the four-quadrant converter set is the output terminal of the harmonic suppression device for dc voltage.
8. A traction power supply for a vehicle, characterized by comprising a device for harmonic suppression of a direct voltage according to any one of claims 1 to 7.
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| CN201477147U (en) * | 2009-07-21 | 2010-05-19 | 北京中纺锐力机电有限公司 | Current detection circuit in energy feedback system |
| CN102267405B (en) * | 2011-05-09 | 2013-11-06 | 株洲变流技术国家工程研究中心有限公司 | Energy feeding type dragging power supply device and control method thereof |
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