CN105977983B - Carrier phase shifting method and system - Google Patents
Carrier phase shifting method and system Download PDFInfo
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- CN105977983B CN105977983B CN201610519832.3A CN201610519832A CN105977983B CN 105977983 B CN105977983 B CN 105977983B CN 201610519832 A CN201610519832 A CN 201610519832A CN 105977983 B CN105977983 B CN 105977983B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides a carrier phase-shifting method and a system, wherein the carrier phase-shifting method is applied to a carrier phase-shifting system, and the carrier phase-shifting system comprises: the system comprises at least two energy feedback type traction power supply devices and a power grid, wherein the at least two energy feedback type traction power supply devices are respectively connected with the power grid. When the energy feedback type traction power supply device detects the characteristic point of the power grid voltage, the phase value of the carrier of the energy feedback type traction power supply device is adjusted to be a corresponding phase preset value. The carrier phase shifting method and the carrier phase shifting system provided by the invention do not need to additionally arrange a hard line for transmitting the synchronous signal in the power supply system, thereby reducing the cost of the power supply system.
Description
Technical Field
The present invention relates to communications technologies, and in particular, to a carrier phase shifting method and system.
Background
The energy feedback type traction power supply device is mostly applied to a rail transit traction power supply system to realize the utilization of train braking energy. The energy feedback type traction power supply device can assist a power supply system to carry out traction power supply and can also carry out current compensation on an external alternating current power grid. However, when a plurality of energy-fed traction power supply devices exist in the system, the superposed current harmonics of the plurality of energy-fed traction power supply devices have an influence on the quality of the power grid.
In the prior art, a synchronization signal required for phase shifting is transmitted through a hard wire, and current harmonic cancellation between energy feedback type traction power supply devices is realized by means of a carrier phase shifting technology, so that the influence of superposed current harmonics on an external alternating current power grid is reduced.
By adopting the prior art, the power supply system needs to be additionally provided with a hard wire for transmitting the synchronous signal, and the cost of the power supply system is higher.
Disclosure of Invention
The invention provides a carrier phase shifting method and a carrier phase shifting system, which do not need a power supply system to be additionally provided with a hard wire for transmitting a synchronous signal, thereby reducing the cost of the power supply system.
The invention provides a carrier phase shift method, which is used in a carrier phase shift system and comprises the following steps:
detecting a voltage characteristic point of a power grid;
and when the voltage characteristic point is detected, adjusting the phase value of the carrier of the energy feedback type traction power supply device to be a phase preset value corresponding to the energy feedback type traction power supply device.
In an embodiment of the present invention, the voltage characteristic point is a zero crossing point of a grid voltage.
In all the above embodiments of the present invention, the method further includes: the energy feedback type traction power supply device control system determines the phase shift angle required between the energy feedback type traction power supply devices by detecting the number of the energy feedback type traction power supply devices operating on line.
And adjusting the frequency of the carrier wave of the energy-feedback traction power supply device according to the phase value of the carrier wave of the energy-feedback traction power supply device and the error value of the phase preset value corresponding to the energy-feedback traction power supply device.
The invention provides a carrier phase shift system, comprising:
the system comprises at least two energy feedback type traction power supply devices and a power grid, wherein the at least two energy feedback type traction power supply devices are respectively connected with the power grid;
the at least two energy feedback type traction power supply devices respectively detect voltage characteristic points of the power grid;
the energy feedback type traction power supply device is used for adjusting a phase value of a carrier of the energy feedback type traction power supply device to a phase preset value corresponding to the energy feedback type traction power supply device when the voltage characteristic point is detected.
In an embodiment of the present invention, the voltage characteristic point is a zero crossing point of a grid voltage.
In the above embodiment of the present invention, the method further includes:
the energy feedback type traction power supply device control system is connected with the at least two energy feedback type traction power supply devices, and determines the phase shift angle required between the energy feedback type traction power supply devices by detecting the number of the energy feedback type traction power supply devices operating on line.
The energy feedback type traction power supply device is also used for determining a phase preset value corresponding to the energy feedback type traction power supply device according to the sequence of the energy feedback type traction power supply device in the energy feedback type traction power supply device group.
The energy-feedback traction power supply device is further used for adjusting the frequency of the carrier wave of the energy-feedback traction power supply device according to the phase value of the carrier wave of the energy-feedback traction power supply device and the error value of the phase preset value corresponding to the energy-feedback traction power supply device.
The invention provides a carrier phase-shifting method and a system, wherein the carrier phase-shifting method is applied to a carrier phase-shifting system, and the carrier phase-shifting system comprises: the system comprises at least two energy feedback type traction power supply devices and a power grid, wherein the at least two energy feedback type traction power supply devices are respectively connected with the power grid. When the energy feedback type traction power supply device detects that the network voltage of the power grid is the preset network voltage, the phase value of the carrier of the energy feedback type traction power supply device is adjusted to be the corresponding phase preset value. The carrier phase shifting method and the carrier phase shifting system provided by the invention do not need to additionally arrange a hard line for transmitting the synchronous signal in the power supply system, thereby reducing the cost of the power supply system.
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, and it is obvious that the drawings in the following description are only 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 structural diagram of a first embodiment of a carrier phase shift system according to the present invention;
FIG. 2 is a schematic diagram of a manner in which an energy-fed traction power supply apparatus detects a zero crossing point of a grid voltage according to an embodiment of a carrier phase shift system of the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of a carrier phase shifting system according to the present invention;
FIG. 4 is a schematic diagram of a carrier phase position determining method of the energy feedback type traction power supply device of the carrier phase shift system according to the present invention;
fig. 5 is a flowchart illustrating a first embodiment of a carrier phase shifting method according to the present invention.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terms "first," "second," "third," "fourth," and the like in the description and in the claims, as well as in the drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a carrier phase shift system according to a first embodiment of the present invention. As shown in fig. 1, the carrier phase shift system provided in this embodiment includes: the system comprises a power grid 1 and at least two energy feedback type traction power supply devices 2. The energy feedback type traction power supply device 2 converts kinetic energy of train braking into alternating current, and is connected to the power grid 1 to perform reactive compensation on the power grid 1 so as to improve the power factor of the power grid 1. U is the network voltage of the power grid 1, and all energy feedback type traction power supply devices 2 in the carrier phase-shifting system are connected with the power grid 1. Because all energy feedback type traction power supply devices 2 in the carrier phase shift system are connected with the power grid 1, all the energy feedback type traction power supply devices 2 can detect the change of the power grid 1 at the same time.
Specifically, the carrier phase shift system comprises at least two energy feedback type traction power supply devices 2. Specifically, for each energy feedback type traction power supply device 2, the energy feedback type traction power supply device 2 detects the network voltage of the power grid 1, and when the energy feedback type traction power supply device 2 detects that the network voltage of the power grid 1 reaches a voltage characteristic point, the energy feedback type traction power supply device 2 adjusts the respective carrier phase value to a phase preset value. The phase preset values of the energy feedback type traction power supply device 2 can be distributed by a carrier phase shift system or calculated by the energy feedback type traction power supply device 2 according to rules, and the phase preset values of different energy feedback type traction power supply devices 2 can be different or the same. The voltage characteristic point may be a peak value, a valley value, or a fixed value of the grid voltage of the power grid 1.
Optionally, when the number of the at least two energy-fed traction power supply devices 2 included in the carrier phase shift system changes, the phase preset value of each energy-fed traction power supply device 2 is readjusted.
One possible implementation manner of this embodiment is that, for example, the phase angle of the carrier of each energy-fed traction power supply apparatus 2 in the carrier phase shifting system, which needs to be phase-shifted, is according to:
respectively calculating to obtain N, wherein N is the number of energy feedback type traction power supply devices 2 contained in the carrier phase shift system; the voltage characteristic point of the carrier phase-shifting system is set as the peak grid voltage of the power grid 1. Suppose that the carrier phase-shifting system comprises four energy-feedback traction power supply devices 2, namely an energy-feedback traction power supply device A, an energy-feedback traction power supply device B, an energy-feedback traction power supply device C and an energy-feedback traction power supply device D, wherein the four energy-feedback traction power supply devices are all connected with a power grid. According to the above rules, the phase angle of the carrier wave of the energy feedback type traction power supply device A needing phase shift is 0 degrees, the phase angle of the carrier wave of the energy feedback type traction power supply device B needing phase shift is 90 degrees, and the energy feedback type traction power supply deviceThe phase angle of the carrier wave of the C required to be phase-shifted is 180 degrees, and the phase angle of the carrier wave of the energy feedback type traction power supply device D required to be phase-shifted is 270 degrees.
The four energy feedback type traction power supply devices detect the network voltage on the power grid 1, when the four energy feedback type traction power supply devices simultaneously detect that the network voltage of the power grid 1 is located at a network voltage zero crossing point, the energy feedback type traction power supply device A sets the phase angle of the carrier wave of the energy feedback type traction power supply device A to be 0 degrees, the energy feedback type traction power supply device B sets the phase angle of the carrier wave of the energy feedback type traction power supply device B to be 90 degrees, the energy feedback type traction power supply device C sets the phase angle of the carrier wave of the energy feedback type traction power supply device C to be 180 degrees, and the. Because of the difference between the grid voltage error and the control system of each energy feedback type traction power supply device caused by the unstable frequency of the power grid, when the grid voltage of the power grid 1 reaches the grid voltage zero crossing point, the phase of the carrier of the four energy feedback type traction power supply devices has errors with the respective phase angles of 0 degree, 90 degrees, 180 degrees and 270 degrees which need phase shifting, and then the phase angles of the respective carrier are adjusted when the grid voltage of the power grid reaches the grid voltage zero crossing point, so that the phase angles of the carrier of each energy feedback type traction power supply device are always kept constant relative to the grid voltage zero crossing point, and are 0 degree, 90 degrees, 180 degrees and 270 degrees in sequence
In this embodiment, when the feedable traction power supply device detects that the grid voltage of the power grid is a voltage characteristic point, the phase value of the carrier of the feedable traction power supply device is adjusted to be a corresponding phase preset value. The network voltage of the power grid reaches the preset value and serves as the phase-shifting synchronization standard, so that the power supply system does not need to additionally set a hard-line transmission synchronization signal serving as the phase-shifting synchronization standard, the cost of the power supply system is reduced, meanwhile, the distance between equipment is limited due to the traditional hard-line transmission mode, synchronization is inaccurate if the distance is too far away, and the accuracy of carrier phase-shifting control is improved.
Optionally, in the above embodiment, the preset grid voltage is a zero grid voltage of the power grid 1, and the voltage value U of the power grid 1 is 0.
Specifically, when the energy feedback type traction power supply device 2 detects a zero crossing point of the grid voltage of the power grid 1, that is, the grid voltage of the power grid 1 reaches a zero grid voltage, the energy feedback type traction power supply device 2 adjusts the phase value of the carrier wave to a preset phase value.
Fig. 2 is a schematic diagram of a mode of detecting a zero crossing point of a power grid voltage by the energy feedback type traction power supply device of the carrier phase shift system. As shown in fig. 2, a possible implementation manner of the present invention is that U is a network voltage of the power grid 1, and E is a square wave Signal that is generated by the energy feedback type traction power supply device 2 in real time according to a sinusoidal waveform of the network voltage of the power grid 1 and has the same phase and frequency as the network voltage, and a rising edge or a falling edge of the square wave Signal can be captured by using a capture function of Digital Signal Processing (DSP), and an interrupt Signal is generated as a synchronization standard for phase shifting.
Optionally, in the above embodiments, each feedable traction power supply device 2 determines the corresponding phase preset value according to its order in the feedable traction power supply device group.
Specifically, at least two energy-fed traction power supply devices 2 included in the carrier phase shift system are simultaneously connected to the power grid 1, and each energy-fed traction power supply device 2 can obtain the sequence in the whole energy-fed traction power supply device group formed by all the energy-fed traction power supply devices.
One possible implementation is: all the energy feedback type traction power supply devices 2 are connected through hard wires and exchange states, each energy feedback type traction power supply device 2 obtains the states of all other energy feedback type traction power supply devices 2, so that the sequence of the energy feedback type traction power supply devices 2 in the whole energy feedback type traction power supply device group is obtained, and the phase preset value corresponding to the energy feedback type traction power supply device 2 is determined according to the obtained sequence.
Fig. 3 is a schematic structural diagram of a second embodiment of the carrier phase shift system according to the present invention. As shown in fig. 3, the carrier phase shift system provided in this embodiment includes: the carrier phase-shifting system comprises a power grid 1, at least two energy feedback type traction power supply devices 2 and an energy feedback type traction power supply device control system 3, wherein each energy feedback type traction power supply device 2 in the carrier phase-shifting system is connected with the power grid 1, and the energy feedback type traction power supply device control system 3 is connected with the at least two energy feedback type traction power supply devices 2. Wherein U is the grid voltage of the grid 1. The energy feedback type traction power supply device 2 converts the kinetic energy of train braking into alternating current, and is connected to the power grid 1 to perform reactive compensation on the power grid 1 so as to improve the power factor of the power grid 1. The energy feedback type traction power supply device control system 3 is used for determining the phase shift angle required between the energy feedback type traction power supply devices 2 according to the number of the energy feedback type traction power supply devices 2, namely determining the phase preset value corresponding to each energy feedback type traction power supply device 2; and respectively sending the phase preset values to the corresponding energy feedback type traction power supply devices 2. Because all energy feedback type traction power supply devices 2 in the carrier phase shift system are connected with the power grid 1, all the energy feedback type traction power supply devices 2 can detect the change of the power grid 1 at the same time.
Specifically, the carrier phase shift system comprises at least two energy feedback type traction power supply devices 2. Specifically, for each energy feedback type traction power supply device 2, the energy feedback type traction power supply device 2 detects the network voltage of the power grid 1, and when the energy feedback type traction power supply device 2 detects that the network voltage of the power grid 1 reaches a voltage characteristic point, the energy feedback type traction power supply device 2 adjusts the respective carrier phase value to a phase preset value. The energy feedback type traction power supply device control system 3 determines a phase preset value of the energy feedback type traction power supply device 2, and sends the phase preset value to the energy feedback type traction power supply device 2. The phase preset values of the different energy-feedback traction power supply devices 2 can be different or the same. The voltage characteristic point may be a peak value, a valley value, a zero crossing point, or a grid voltage with a fixed value of the power grid 1.
Optionally, when the number of the energy feedback type traction power supply devices 2 in the carrier phase shift system changes, the phase preset value of each energy feedback type traction power supply device 2 is readjusted. Specifically, the energy feedback type traction power supply device control system 3 detects that the number of the energy feedback type traction power supply devices 2 in the carrier phase shift system changes, re-determines the phase preset value of each energy feedback type traction power supply device 2, and respectively sends the phase preset values to the corresponding energy feedback type traction power supply devices 2.
One possible implementation manner of this embodiment is, for example, that four energy-fed traction power supply devices 2 are included in the carrier phase shift system, and all the four energy-fed traction devices 2 are connected to the power grid 1. The energy feedback type traction power supply device control system 3 sequentially names four parallel energy feedback type traction power supply devices 2 as an energy feedback type traction power supply device A, an energy feedback type traction power supply device B, an energy feedback type traction power supply device C and an energy feedback type traction power supply device D according to the number of the energy feedback type traction power supply devices, and sequentially allocates a phase angle at which a carrier of the energy feedback type traction power supply device A needs to be phase-shifted to be 0 degrees, a phase angle at which a carrier of the energy feedback type traction power supply device B needs to be phase-shifted to be 90 degrees, a phase angle at which a carrier of the energy feedback type traction power supply device C needs to be phase-shifted to be 180 degrees, and a phase angle at which a carrier of the energy feedback type traction power supply device D.
The four energy feedback type traction power supply devices detect the network voltage on the power grid 1, when the four energy feedback type traction power supply devices detect that the network voltage of the power grid 1 is zero network voltage at the same time, the energy feedback type traction power supply device A sets the phase angle of the carrier wave of the energy feedback type traction power supply device A to be 0 degrees, the energy feedback type traction power supply device B sets the phase angle of the carrier wave of the energy feedback type traction power supply device B to be 90 degrees, the energy feedback type traction power supply device C sets the phase angle of the carrier wave of the energy feedback type traction power supply device C to be 180 degrees, and the energy feedback. When the network voltage of the power grid 1 reaches the peak network voltage each time, the phase angles of the carriers of the energy feedback type traction power supply devices A, B, C and D are adjusted according to phase preset values specified by the control system 3 of the energy feedback type traction power supply devices, so that the phase angles of the carriers of the energy feedback type traction power supply devices are always constant relative to the voltage peak network voltage of the power grid 1 and are 0 degree, 90 degrees, 180 degrees and 270 degrees in sequence
In this embodiment, when the feedable traction power supply device detects that the grid voltage of the power grid is a voltage characteristic point, the phase value of the carrier of the feedable traction power supply device is adjusted to be a corresponding phase preset value, where the phase preset value is determined by the feedable traction power supply device control system. The carrier phase-shifting system of the embodiment uses the network voltage of the power grid to reach the voltage characteristic point as the synchronous standard of carrier phase shifting, so that the power supply system is not required to additionally set a hard-wire transmission synchronous signal as the synchronous standard of phase shifting, the cost of the power supply system is further reduced, meanwhile, the distance between equipment is limited due to the traditional hard-wire transmission mode, the synchronization is inaccurate if the distance is too far, and the application of the embodiment also improves the accuracy of carrier phase-shifting control.
In the above embodiment, further, for each of the energy feedback type traction power supply devices 2, the energy feedback type traction power supply device 2 adjusts the frequency of the carrier wave through the phase value of the carrier wave of the energy feedback type traction power supply device and the error value of the corresponding phase preset value of the energy feedback type traction power supply device 2, so as to adjust the phase value of the carrier wave of the energy feedback type traction power supply device 2 to the corresponding phase preset value.
One possible implementation is: when the energy feedback type traction power supply device 2 detects that the network voltage of the power grid 1 reaches the preset network voltage, the frequency of the carrier wave is adjusted, and the phase value of the carrier wave of the energy feedback type traction power supply device 2 is adjusted to be the corresponding phase preset value. Because the frequency of the power grid is unstable, the error of the grid voltage and the error of the carrier frequency of each energy feedback type traction power supply device 2 are caused, and the phase of the carrier of the energy feedback type traction power supply device 2 changes every time the grid voltage of the power grid reaches a voltage characteristic point.
For example: fig. 4 is a schematic diagram of a carrier phase position determination method of a energy-feedback traction power supply device in a carrier phase shift system according to the present invention. As shown in fig. 4, taking a triangular carrier as an example, the preset phase value of the carrier of the energy-fed traction power supply device 2 shown in the figure is 0 °, that is, the carrier shown in 401, and the phase angle of the carrier of the energy-fed traction power supply device 2 is located at the preset phase value of 0 ° at the time T when the energy-fed traction power supply device 2 detects that the grid voltage of the power grid 1 reaches the voltage characteristic point. Due to the fact that the frequency of the power grid 1 is unstable, errors of grid voltage and carrier frequency errors of the energy feedback type traction power supply devices exist, and certain errors exist between the phase of a carrier of the energy feedback type traction power supply device 2 and a preset phase value of 0 degrees. As shown in 402, at a time T when the energy feedback type traction power supply device detects that the grid voltage reaches the voltage characteristic point, the phase of the carrier of the energy feedback type traction power supply device 2 is not yet 0 °, the phase lag, that is, the carrier frequency is small, and the carrier frequency should be increased; as shown in 403, at time T when the feedable traction power supply device 2 detects that the grid voltage reaches the voltage characteristic point, the phase of the carrier of the feedable traction power supply device 2 exceeds 0 °, the phase is advanced, that is, the carrier frequency is large, and the carrier frequency should be reduced. Finally, it should be noted that: fig. 4 is a schematic diagram of a carrier phase position determination method of a regenerative traction power supply device in a carrier phase shift system according to the present invention, where errors of carriers are all shown in one carrier period, but the present invention is not limited thereto, and when an error of a carrier is greater than one carrier period, the degree of phase advance or phase lag can still be detected by carrier counting or the like.
One possible implementation is that, for example, the feedable traction power supply 2 comprises a DSP counting module for counting the carriers of the feedable traction power supply 2. The energy feedback type traction power supply device 2 detects that the characteristic point of the voltage of the power grid 1 is zero grid voltage. The frequency of the carrier wave is assumed to be 1kHz and the frequency of the grid voltage of the grid 1 is assumed to be 50 Hz. If the carrier phase lags at the moment when the network voltage is detected to be the zero point, the energy-feedback type traction power supply device 2 indicates that the carrier frequency is small, the frequency of the carrier wave needs to be increased, and the period of the carrier wave is reduced according to the count value error x of the DSP counting module, because the 20 triangular carriers are obtained according to the frequency of the carrier wave and the frequency of the network voltage of the power grid 1 every time the network voltage is detected to be the zero point, the count value error required to be adjusted is averagely divided into each carrier wave for adjustment, namely the period of the DSP count value of the carrier wave is reduced by x/20. If the carrier phase is advanced at the moment when the network voltage is detected to be zero, the carrier frequency is large, the carrier frequency needs to be reduced, the period of the carrier is increased according to the count value error x of the DSP counting module, and the count value error to be adjusted is averagely divided into each carrier to be adjusted because the 20 triangular carriers are obtained according to the frequency of the carrier and the frequency of the network voltage of the power grid each time the network voltage is detected to be zero, namely the period of the DSP count value of the carrier is increased by x/20.
In this embodiment, when the energy feedback type traction power supply device detects that the grid voltage of the power grid is a voltage characteristic point, the phase value of the carrier of the energy feedback type traction power supply device is adjusted to a corresponding phase preset value, wherein the phase is adjusted by adjusting the frequency of the carrier. The carrier phase-shifting system of the embodiment takes the network voltage of the power grid reaching the voltage characteristic point as the synchronous standard of carrier phase shifting, so that a power supply system does not need to additionally arrange a hard line transmission synchronous signal as the synchronous standard of phase shifting; and avoid the carrier phase mutation brought by the phase of the carrier of force setting at the moment of the synchronous phase place to guarantee that the normal modulation of the carrier is not influenced, because the distance between the traditional hard line transmission mode makes the apparatus limited at the same time, the too far distance will cause the synchronization inaccurate, the application of this embodiment has still improved the accuracy of the phase shift control of the carrier.
Fig. 5 is a flowchart illustrating a first embodiment of a carrier phase shifting method according to the present invention. As shown in fig. 5, the carrier phase shifting method of this embodiment includes the following steps:
s501: and detecting a voltage characteristic point of the power grid.
The voltage characteristic point may be a peak value, a valley value, or a fixed value of grid voltage.
S502: and when the voltage characteristic point is detected, adjusting the phase value of the carrier of the energy feedback type traction power supply device to be a phase preset value corresponding to the energy feedback type traction power supply device.
The energy feedback type traction power supply device converts kinetic energy of train braking into alternating current, and is connected to a power grid to perform reactive compensation on the power grid so as to improve the power factor of the power grid. All energy feedback type traction power supply devices in the carrier phase-shifting system are connected with a power grid. All energy feedback type traction power supply devices in the carrier phase shift system are connected with the power grid, so that all the energy feedback type traction power supply devices can detect the change of the power grid at the same time.
Specifically, the carrier phase-shifting system comprises at least two energy feedback type traction power supply devices. Specifically, for each energy feedback type traction power supply device, the energy feedback type traction power supply device detects the network voltage of the power grid, and when the energy feedback type traction power supply device detects that the network voltage of the power grid reaches a voltage characteristic point, the energy feedback type traction power supply device adjusts the respective carrier phase value to a phase preset value. The phase preset values of the energy feedback type traction power supply devices can be distributed through a carrier phase shift system or calculated according to rules, and the phase preset values of different energy feedback type traction power supply devices can be different or the same.
In this embodiment, when the feedable traction power supply device detects that the grid voltage of the power grid is a voltage characteristic point, the phase value of the carrier of the feedable traction power supply device is adjusted to be a corresponding phase preset value. The network voltage of the power grid reaches the synchronous standard that the voltage characteristic point is phase-shifted, so that a power supply system does not need to additionally set a hard-line transmission synchronous signal as the phase-shifted synchronous standard, the cost of the power supply system is reduced, and meanwhile, because the distance between equipment is limited by a traditional hard-line transmission mode, the synchronization is inaccurate if the distance is too far, and the accuracy of carrier phase-shifting control is improved.
Optionally, when the number of at least two energy-fed traction power supply devices included in the carrier phase shift system changes, the phase preset value of each energy-fed traction power supply device is readjusted.
Further, in the above embodiment, the preset grid voltage is a zero grid voltage of the power grid, that is, the grid voltage of the power grid is zero.
Specifically, when the energy feedback type traction power supply device detects that the voltage characteristic point is the zero crossing point of the voltage of the power grid, namely the voltage of the power grid reaches the zero grid voltage, the energy feedback type traction power supply device adjusts the phase value of the carrier wave to be the preset phase value.
Optionally, in each of the above embodiments, the phase preset value corresponding to the feedable traction power supply device is determined according to the order of the feedable traction power supply device in the feedable traction power supply device group.
Specifically, at least two energy feedback type traction power supply devices included in the carrier phase shift system are simultaneously connected to the power grid, and each energy feedback type traction power supply device can obtain the sequence of the energy feedback type traction power supply devices in the whole energy feedback type traction power supply device group formed by all the energy feedback type traction power supply devices.
One possible implementation is: all the energy feedback type traction power supply devices are connected through hard wires and exchange states mutually, each energy feedback type traction power supply device obtains the states of all other energy feedback type traction power supply devices, so that the sequence of the energy feedback type traction power supply devices in the whole energy feedback type traction power supply device group is obtained, and the corresponding phase preset value of the energy feedback type traction power supply devices is determined according to the obtained sequence.
Optionally, in each of the above embodiments, the feedable traction power supply control system determines the angle of the required phase shift between feedable traction power supplies by detecting the number of the feedable traction power supplies operating online.
Specifically, the energy feedback type traction power supply device control system is used for determining a phase preset value corresponding to each energy feedback type traction power supply device according to the number of the energy feedback type traction power supply devices; and respectively sending the phase preset values to the corresponding energy feedback type traction power supply devices.
Optionally, when the number of energy feedback traction power supply devices in the carrier phase shift system changes, the phase preset value of each energy feedback traction power supply device is readjusted. The energy feedback type traction power supply device control system detects the change of the number of the energy feedback type traction power supply devices in the carrier phase shift system, re-determines the phase preset value of each energy feedback type traction power supply device, and respectively sends the phase preset values to the corresponding energy feedback type traction power supply devices.
Further, in the above embodiment, the frequency of the carrier of the feedable traction power supply device is adjusted according to the phase value of the carrier of the feedable traction power supply device and the error value of the phase preset value corresponding to the feedable traction power supply device.
One possible implementation is: because the frequency of the power grid is unstable, the error of the grid voltage and the error of the carrier frequency of each energy feedback type traction power supply device are caused, and the phase of the carrier of each energy feedback type traction power supply device changes every time the grid voltage of the power grid reaches a voltage characteristic point. When the energy feedback type traction power supply device detects that the network voltage of the power grid reaches the preset network voltage, the frequency of the carrier wave is adjusted, and the phase value of the carrier wave of the energy feedback type traction power supply device is adjusted to be the corresponding phase preset value.
For example: fig. 4 is a schematic diagram of a carrier phase position determination method of a energy-feedback traction power supply device in a carrier phase shift system according to the present invention. As shown in fig. 4, taking a triangular carrier as an example, the preset phase value of a carrier of the energy-fed traction power supply device shown in the figure is 0 °, that is, the carrier shown in 401 in the figure, and at a time T when the energy-fed traction power supply device detects that the grid voltage of the power grid reaches the voltage characteristic point, the phase angle of the carrier of the energy-fed traction power supply device is located at the preset phase value of 0 °. Due to the fact that frequency of the power grid is unstable, errors of grid voltage and carrier frequency errors of the energy feedback type traction power supply devices are caused, and certain errors exist between the phase position of the carrier of the energy feedback type traction power supply device and a phase preset value of 0 degree. As shown in 402, at a time T when the energy-fed traction power supply device detects that the grid voltage reaches the voltage characteristic point, the phase of the energy-fed traction power supply device carrier does not reach 0 °, and the phase lag, i.e., the carrier frequency is small, the carrier frequency should be increased; as shown in 403, at time T when the feedable traction power supply detects that the grid voltage reaches the voltage characteristic point, the phase of the feedable traction power supply carrier exceeds 0 °, the phase is advanced, that is, the carrier frequency is large, and the carrier frequency should be reduced. Finally, it should be noted that: fig. 4 is a schematic diagram of a carrier phase position determination method of a regenerative traction power supply device in a carrier phase shift system according to the present invention, where errors of carriers are all shown in one carrier period, but the present invention is not limited thereto, and when an error of a carrier is greater than one carrier period, the degree of phase advance or phase lag can still be detected by carrier counting or the like.
In this embodiment, when the network voltage of the power grid is detected to be the preset network voltage by the energy feedback type traction power supply device, the phase value of the carrier of the energy feedback type traction power supply device is adjusted to be the corresponding phase preset value, wherein the phase is adjusted by adjusting the frequency of the carrier. The carrier phase shifting system of the embodiment takes the network voltage of the power grid reaching a preset value as the synchronization standard of carrier phase shifting, so that a power supply system does not need to additionally set a hard line transmission synchronization signal as the synchronization standard of phase shifting; and avoid the carrier phase mutation brought by the phase of the carrier of force setting at the moment of the synchronous phase place to guarantee that the normal modulation of the carrier is not influenced, because the distance between the traditional hard line transmission mode makes the apparatus limited at the same time, the too far distance will cause the synchronization inaccurate, the application of this embodiment has still improved the accuracy of the phase shift control of the carrier.
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 (6)
1. A carrier phase shifting method is characterized by being applied to a carrier phase shifting system, wherein the carrier phase shifting system comprises a power grid and at least two energy feedback type traction power supply devices, and the at least two energy feedback type traction power supply devices are respectively connected with the power grid; the method comprises the following steps:
the at least two energy feedback type traction power supply devices respectively detect voltage characteristic points of a power grid;
when the at least two energy feedback type traction power supply devices detect the voltage characteristic point, adjusting a phase value of a carrier of each energy feedback type traction power supply device in the at least two energy feedback type traction power supply devices to be a phase preset value corresponding to the energy feedback type traction power supply device;
the voltage characteristic point is a zero crossing point of the power grid voltage;
the method further comprises the following steps:
the at least two energy feedback type traction power supply devices adjust the frequency of the carrier wave of the energy feedback type traction power supply device according to the phase value of the carrier wave of the energy feedback type traction power supply device and the error value of the phase preset value corresponding to the energy feedback type traction power supply device;
when the at least two energy feedback type traction power supply devices detect the voltage characteristic point, adjusting a phase value of a carrier of each energy feedback type traction power supply device of the at least two energy feedback type traction power supply devices to a phase preset value corresponding to the energy feedback type traction power supply device, including:
each energy feedback type traction power supply device generates a square wave signal which has the same phase and frequency as the network voltage of the power grid according to the waveform of the network voltage of the power grid;
capturing the rising edge or the falling edge of the square wave signal by adopting a digital signal processing DSP, and generating an interrupt signal as a phase-shifted synchronous signal;
and adjusting the phase value of the carrier of each energy-fed traction power supply device to a phase preset value corresponding to the energy-fed traction power supply device according to the synchronous signal.
2. The method of claim 1, further comprising:
the energy feedback type traction power supply device control system determines the phase shift angle required between the energy feedback type traction power supply devices by detecting the number of the energy feedback type traction power supply devices operating on line.
3. The method of claim 1, further comprising:
and determining a phase preset value corresponding to the energy-feedback traction power supply device according to the sequence of the energy-feedback traction power supply device in the energy-feedback traction power supply device group.
4. A carrier phase shifting system, comprising:
the system comprises at least two energy feedback type traction power supply devices and a power grid, wherein the at least two energy feedback type traction power supply devices are respectively connected with the power grid;
the at least two energy feedback type traction power supply devices respectively detect voltage characteristic points of the power grid;
the energy feedback type traction power supply device is used for adjusting a phase value of a carrier of the energy feedback type traction power supply device to a phase preset value corresponding to the energy feedback type traction power supply device when the voltage characteristic point of the power grid is detected;
the voltage characteristic point is a zero crossing point of the power grid voltage;
the energy-feedback traction power supply device is also used for adjusting the frequency of the carrier wave of the energy-feedback traction power supply device according to the phase value of the carrier wave of the energy-feedback traction power supply device and the error value of the phase preset value corresponding to the energy-feedback traction power supply device;
when the voltage characteristic point is detected, adjusting a phase value of a carrier of an energy feedback type traction power supply device to a phase preset value corresponding to the energy feedback type traction power supply device, including:
each energy feedback type traction power supply device generates a square wave signal which has the same phase and frequency as the network voltage of the power grid according to the waveform of the network voltage of the power grid;
capturing the rising edge or the falling edge of the square wave signal by adopting a digital signal processing DSP, and generating an interrupt signal as a phase-shifted synchronous signal;
and adjusting the phase value of the carrier of each energy-fed traction power supply device to a phase preset value corresponding to the energy-fed traction power supply device according to the synchronous signal.
5. The system of claim 4, further comprising:
the energy feedback type traction power supply device control system is connected with the at least two energy feedback type traction power supply devices, and determines the phase shift angle required between the energy feedback type traction power supply devices by detecting the number of the energy feedback type traction power supply devices operating on line.
6. The system of claim 4, wherein the feedable traction power supply device is further configured to determine a phase preset value corresponding to the feedable traction power supply device according to an order of the feedable traction power supply device in a group of feedable traction power supply devices.
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| CN103401460A (en) * | 2013-06-29 | 2013-11-20 | 华为技术有限公司 | Method and device for PWM (pulse width modulation) of three-phase carrier waves |
| CN205791536U (en) * | 2016-07-05 | 2016-12-07 | 北京千驷驭电气有限公司 | Phase-shifting carrier wave system |
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| CN104716851A (en) * | 2013-12-17 | 2015-06-17 | 北车大连电力牵引研发中心有限公司 | Converter control method and device |
| CN105656338B (en) * | 2014-11-14 | 2018-08-14 | 比亚迪股份有限公司 | The common-mode voltage suppressing method and inverter system of multiple inverters |
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| CN103401460A (en) * | 2013-06-29 | 2013-11-20 | 华为技术有限公司 | Method and device for PWM (pulse width modulation) of three-phase carrier waves |
| CN205791536U (en) * | 2016-07-05 | 2016-12-07 | 北京千驷驭电气有限公司 | Phase-shifting carrier wave system |
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