CN114362222A - Parallel control method and device for through type in-phase power supply device - Google Patents
Parallel control method and device for through type in-phase power supply device Download PDFInfo
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Abstract
The present disclosure provides a parallel control method and apparatus for a through-type in-phase power supply apparatus. Wherein, the method comprises the following steps: respectively collecting position information of a traction locomotive and each parallel through type in-phase power supply device, and respectively calculating an active power given value based on the position information; according to the sampling voltage value and the sampling current value, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated; and performing frequency modulation and voltage regulation control on each through-type in-phase power supply device based on the single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input. The active loop parameters of the virtual synchronous machine are changed in real time by introducing the position information of the traction locomotive and based on the frequency control method of the virtual synchronous machine, so that the nearby power supply between the parallel devices is realized, and the purposes of inhibiting the circulation and improving the stability of the system are achieved.
Description
Technical Field
The disclosure relates to the field of power electronic control, in particular to a parallel control method and device for a through-type in-phase power supply device.
Background
The traction power supply system in China adopts a single-phase power frequency alternating current system, a power frequency balance transformer is adopted to supply power to a single-phase traction network from a three-phase power grid, high-power traction load can cause unbalance of three-phase voltage on the power grid side, the power quality of the power grid is seriously influenced, and meanwhile, due to the fact that phases of traction power supply voltage are inconsistent, an electric phase splitting is required to be added, and the overall performance of the traction power supply system is seriously influenced. The through type in-phase power supply can adopt a power electronic conversion device to complete the conversion of three-phase alternating current-direct current-single-phase alternating current, and the problem of power quality at the side of a power grid is solved. In the prior art, the through-type in-phase power supply is mainly divided into two types:
a through power supply system for traction substation groups is formed by traction substation groups supplied with power by the same power grid substation, each group consists of a central traction substation (MSS) and a common traction substation (SS), single-phase transformers are adopted in the groups to supply power by two phases with the same power grid so as to ensure that the voltage phases of the traction grids are the same, and a power electronic conversion device is utilized in the central traction substation to intensively compensate negative sequence components caused by single-phase traction loads, so that through-type in-phase power supply without split phase is formed in the power supply range of the same power grid substation.
For a through-type in-phase power supply system of a traction substation group, power supply sections of the through-type in-phase power supply system are concentrated in the range of a traction substation supplied with power by the same power grid substation, the capacity of a compensation device is limited, the power supply distance is limited, a certain number of electric phases still need to be arranged on the whole traction grid line in consideration of different traction substation voltages under the same power grid voltage level, and the operation capacity and the speed are still limited to a certain degree.
The other mode is that a power electronic conversion device is used for carrying out three-phase alternating current-direct current-single-phase alternating current conversion to directly supply power to a traction network, and as the three-phase rectification-single-phase inversion in the in-phase power supply device belongs to the isolation action of symmetrical conversion and a direct current link, a single-phase traction load cannot cause unbalance phenomenon on the three-phase power network side, and meanwhile, the output voltage of each inverter is controlled on the single-phase inverter side, so that the output voltages of the inverters are consistent, and the electric phase splitting is cancelled. The power supply is born by the same-phase power supply device, and the problem of off-grid parallel connection of single-phase inverters is involved.
In addition, the traction substation supplies power in parallel, a master station provides voltage support, and a slave station adopts a master-slave mode, wherein the master station has high requirement on the master station, the power supply quality of the traction network can be seriously influenced by the fault of one master station, the slave station adopts droop control, and the fluctuation and the sudden change of the load can cause sudden change of the power supply frequency and the voltage due to the characteristic of the droop control, and a locomotive needs to run at high speed among various traction stations, which is equivalent to a mobile high-power load, thereby causing great challenge to the parallel stability of a parallel system.
Accordingly, there is a need for one or more methods to address the above-mentioned problems.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present disclosure, and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
An object of the present disclosure is to provide a parallel control method and apparatus for a through-type in-phase power supply apparatus, thereby overcoming, at least to some extent, one or more of the problems due to the limitations and disadvantages of the related art.
According to one aspect of the present disclosure, there is provided a parallel control method for a through-type in-phase power supply device, including:
respectively collecting position information of a traction locomotive and each parallel through in-phase power supply device, and respectively calculating active power given values of the plurality of parallel through in-phase power supply devices on the basis of the position information;
according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated;
and performing frequency and voltage modulation control on each through-type in-phase power supply device based on a single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input, and completing the parallel control of the through-type in-phase power supply devices.
In an exemplary embodiment of the present disclosure, the method further comprises:
based on a positioning device on a through type in-phase power supply device carrier, acquiring position information of a first through type in-phase power supply device, position information of a second through type in-phase power supply device and position information of a traction locomotive, and generating a position coefficient x according to the position information of the through type in-phase power supply device;
based on the position coefficient x, respectively calculating the active power given values of the first through type in-phase power supply device and the second through type in-phase power supply device which are connected in parallel to be
Wherein, P1ref、P2refThe active power given values of the first through type in-phase power supply device and the second through type in-phase power supply device are respectively set, P is the rated power value of a single through type in-phase power supply device, and d is the total length of a line.
In an exemplary embodiment of the present disclosure, the method further comprises:
according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated as
Wherein u isα，uβThe voltage values i of the through-type in-phase power supply device under an orthogonal coordinate systemα，iβThe current values P of the through type in-phase power supply device under an orthogonal coordinate systemeFor the active power output value, Q, of the through-type in-phase power supply deviceeAnd outputting a reactive power output value for the through type in-phase power supply device.
In an exemplary embodiment of the present disclosure, the method further comprises:
the frequency modulation control based on the VSG of the single-phase virtual synchronous machine is
Where ω is the actual angular frequency, ωNIs a rated angular frequency, J is a virtual moment of inertia, D is a damping coefficient, PrefFor a given value of active power of a through-type in-phase power supply device, tau is a time constant, DpThe sag factor:
in an exemplary embodiment of the present disclosure, the method further comprises:
and performing frequency modulation control on the first through type in-phase power supply device and the second through type in-phase power supply device based on the single-phase virtual synchronous machine VSG by taking the active power output value and the active power given value as input
Wherein, ω is1、ω2Actual angular frequencies of the first through type in-phase power supply device and the second through type in-phase power supply device are respectively set;
and the parallel control of the through type in-phase power supply device is completed, and the nearby power supply of the first through type in-phase power supply device and the second through type in-phase power supply device is realized.
In an exemplary embodiment of the present disclosure, the method further comprises:
and taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input, carrying out frequency and voltage modulation control on each through in-phase power supply device based on a single-phase virtual synchronous generator VSG, using the obtained voltage given value for the voltage effective value outer ring, and finishing the output control of the single through in-phase power supply device by a double-ring control system of the voltage instantaneous value inner ring.
In one aspect of the present disclosure, there is provided a parallel control device of a through-type in-phase power supply device, including:
the active power given value calculation module is used for respectively acquiring position information of the traction locomotive and each parallel through-type in-phase power supply device and respectively calculating active power given values of the plurality of parallel through-type in-phase power supply devices on the basis of the position information;
the single-phase power output value generation module is used for performing single-phase power calculation in a two-phase orthogonal system according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device and respectively generating an active power output value and a reactive power output value;
and the VSG-based parallel control module is used for performing frequency and voltage modulation control on each through-type in-phase power supply device based on a single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input so as to complete the parallel control of the through-type in-phase power supply devices.
In an exemplary embodiment of the present disclosure, a parallel control method of a through-type in-phase power supply apparatus includes: respectively collecting position information of a traction locomotive and each parallel through type in-phase power supply device, and respectively calculating an active power given value based on the position information; according to the sampling voltage value and the sampling current value, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated; and performing frequency modulation and voltage regulation control on each through-type in-phase power supply device based on the single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input. The active loop parameters of the virtual synchronous machine are changed in real time by introducing the position information of the through-type in-phase power supply device and based on the frequency control method of the virtual synchronous machine, so that the nearby power supply between the parallel devices is realized, and the purposes of restraining the circulation and improving the stability of the system are achieved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
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The above and other features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
Fig. 1 shows a flow chart of a parallel control method of a pass-through in-phase power supply according to an exemplary embodiment of the present disclosure;
fig. 2 is a diagram illustrating an equivalent circuit diagram of parallel power supply of two in-phase power supply devices according to an exemplary embodiment of the disclosure;
FIG. 3 illustrates a VSG active-frequency control block diagram of a parallel control method of a pass-through in-phase power supply according to an exemplary embodiment of the present disclosure;
FIG. 4 illustrates a parallel circulating current schematic of a through-type in-phase power supply parallel control method according to an exemplary embodiment of the present disclosure;
FIG. 5 illustrates a double closed-loop control diagram of a single in-phase power supply of a method of parallel control of a pass-through in-phase power supply according to an exemplary embodiment of the present disclosure;
FIG. 6 illustrates a control flow diagram of a parallel control method of a pass-through in-phase power supply according to an exemplary embodiment of the present disclosure;
fig. 7 shows a schematic block diagram of a parallel control arrangement of a pass-through in-phase power supply according to an exemplary embodiment of the present disclosure.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the embodiments of the disclosure can be practiced without one or more of the specific details, or with other methods, components, materials, devices, steps, and so forth. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in the form of software, or in one or more software-hardened modules, or in different networks and/or processor devices and/or microcontroller devices.
In the present exemplary embodiment, first, a parallel control method of a through-type in-phase power supply device is provided; referring to fig. 1, the parallel control method of the through-type in-phase power supply device may include the following steps:
step S110, respectively collecting position information of a traction locomotive and each parallel through type in-phase power supply device, and respectively calculating active power given values of the plurality of parallel through type in-phase power supply devices on the basis of the position information;
step S120, according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated;
and step S130, performing frequency and voltage modulation control on each through-type in-phase power supply device based on a single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input, and completing the parallel connection control of the through-type in-phase power supply devices.
In an exemplary embodiment of the present disclosure, a parallel control method of a through-type in-phase power supply apparatus includes: respectively collecting position information of a traction locomotive and each parallel through type in-phase power supply device, and respectively calculating an active power given value based on the position information; according to the sampling voltage value and the sampling current value, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated; and performing frequency modulation and voltage regulation control on each through-type in-phase power supply device based on the single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input. The active loop parameters of the virtual synchronous machine are changed in real time by introducing the position information of the through-type in-phase power supply device and based on the frequency control method of the virtual synchronous machine, so that the nearby power supply between the parallel devices is realized, and the purposes of restraining the circulation and improving the stability of the system are achieved.
Next, a parallel control method of a through-type in-phase power supply device in the present exemplary embodiment will be further described.
In step S110, position information of the traction locomotive and each parallel through in-phase power supply device may be collected, and active power set values of the plurality of parallel through in-phase power supply devices may be calculated based on the position information.
In the embodiment of the present example, as shown in fig. 2, the two-device parallel power supply equivalent circuit is different from a conventional centralized converter that distributes power evenly or according to a fixed capacity, and when the in-phase power supply device supplies power in parallel, the power distribution should be performed according to the line impedance of the in-phase power supply devices at two ends by using a near power supply method, that is, the line impedance is inversely proportional, so as to minimize the power loss on the line.
The line impedance can be considered approximately uniform, for which purpose the position of the locomotive between two traction stations can be obtained in real time using GPS positioning on the locomotive for calculating the power distribution coefficient, the current locomotive power factor can be considered approximately 1, and thus dynamic power distribution is mainly achieved by adjusting the active outputs of the two devices.
Droop coefficient D in VSG controlpDetermining the active power distribution of the two devices, D for the purpose of realizing the near power supplypIt is required to be inversely proportional to the locomotive position coefficient x according to the equation (11) DpThe relation with D is obtained, and the relation between the damping coefficient D and the position coefficient of the locomotive is
In the formula D1，D2Damping coefficients of two parallel devices, D1,2The reference value of the damping coefficient of the two devices is shown, and d is the total length of the line.
In an embodiment of the present example, the method further comprises:
based on a positioning device on a through type in-phase power supply device carrier, acquiring position information of a first through type in-phase power supply device, position information of a second through type in-phase power supply device and position information of a traction locomotive, and generating a position coefficient x according to the position information of the through type in-phase power supply device;
based on the position coefficient x, respectively calculating the active power given values of the first through type in-phase power supply device and the second through type in-phase power supply device which are connected in parallel to be
Wherein, P1ref、P2refThe active power given values of the first through type in-phase power supply device and the second through type in-phase power supply device are respectively set, P is the rated power value of a single through type in-phase power supply device, and d is the total length of a line.
Because the power factor of the locomotive is 1, the given reactive power value of each device is set to be zero.
In step S120, a single-phase power calculation may be performed in the two-phase quadrature system based on the sampled voltage value and the sampled current value of each feedthrough in-phase power supply device, and an active power output value and a reactive power output value may be generated, respectively.
In the embodiment of the example, the conventional VSG control is mainly directed to the grid connection of a three-phase inverter, while the traction grid is supplied by single-phase alternating current, so the VSG control for traction power supply must construct the single-phase VSG control based on single-phase power calculation, because a locomotive belongs to a high-power mobile load, the voltage and current flowing through the locomotive dynamically change, and the voltage and current output by the device have distortion, so when the actual output power of the in-phase power supply device is calculated, the single-phase power calculation based on the cycle average value is not accurate enough, in order to ensure the accuracy and real-time performance of power loop control, the instantaneous power calculation theory of three phases is followed, the instantaneous single-phase voltage and current is constructed by delaying 90 degrees by adopting a mode of overlapping two low-pass filters, the single-phase power calculation is carried out in a two-phase orthogonal system, and the active and reactive instantaneous average values actually output by the device are obtained and used in the regulation of the VSG power loop, therefore, VSG control is combined with the railway power supply system and the power supply characteristics to form single-phase VSG control suitable for in-phase power supply, the voltage current and power calculation equation under the orthogonal coordinate system is as follows,
constructing the voltage and current delay of 90 degrees in the step (6) into a quadrature signal to obtain
Wherein U is effective value of traction network voltage, k is harmonic frequency, ikIs the effective value of the harmonic current,
is the power factor angle.
In an embodiment of the present example, the method further comprises:
according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated as
Wherein u isα，uβThe voltage values i of the through-type in-phase power supply device under an orthogonal coordinate systemα，iβThe current values P of the through type in-phase power supply device under an orthogonal coordinate systemeFor the active power output value, Q, of the through-type in-phase power supply deviceeAnd outputting a reactive power output value for the through type in-phase power supply device.
In step S130, frequency and voltage modulation control may be performed on each through-type in-phase power supply device based on the single-phase virtual synchronous machine VSG by using the active power output value, the reactive power output value, the active power given value, and the reactive power given value as inputs, so as to complete parallel control of the through-type in-phase power supply device.
In the embodiment of the present example, as can be seen from fig. 3, the output of the in-phase power supply device controlled by the VSG is related to the load size, the inertia and the damping parameters, and the output of the device has the frequency modulation characteristic of the synchronous machine.
From FIG. 3, the transfer function of the controller can be found as
By simplifying the formula (8), a compound of
In an embodiment of the present example, the method further comprises:
the frequency modulation control based on the VSG of the single-phase virtual synchronous machine is
Where ω is the actual angular frequency, ωNIs a rated angular frequency, J is a virtual moment of inertia, D is a damping coefficient, PrefFor a given value of active power of a through-type in-phase power supply device, tau is a time constant, DpThe sag factor:
in the embodiment of the example, when the power of the locomotive changes, the system can also adjust the output frequency and the output voltage by using the virtual frequency modulator according to the power change value, so as to influence the output voltage phasor of each device, thereby reducing the circulation current between the devices and ensuring the stability.
The equivalent circuit of two devices connected in parallel is shown in figure 4, and because the current output at two ends is inconsistent because the nearby power supply needs to be realized, the voltage is adopted to define the circulating current as the formula (12)
U1，U2，I1，I2，
Is the output voltage, current and phase angle I of two devicesHIs a circular flow I0Is the load current
Phase angle difference, Z1，Z2To line impedance, Z is the load impedance. In the parallel system, if the first equipment is assumed to increase the output frequency by delta f due to disturbance, and if the two parallel equipment are not related, a reference value is given only through a terminal, the phase difference of the two devices can occur
The periodic change causes low-frequency oscillation, and meanwhile, the circulation current is periodically increased, so that the system is unstable. After VSG control is adopted, two devices carry out implicit communication through output power, and after circulation current is increased, the first device PeIncreasing, the first equipment angular frequency gradually decreases by the regulation of formula (10)To thereby regulate the output
The purpose of circulating current suppression is achieved, meanwhile, in the adjusting process, due to the inertia effect of the VSG, the frequency cannot change suddenly along with the sudden change of the power, and the stability of a parallel system is guaranteed to the maximum extent.
In the embodiment of the example, the active power output value and the active power given value are used as input, and the frequency modulation control is performed on the first through type in-phase power supply device and the second through type in-phase power supply device based on the single-phase virtual synchronous machine VSG
Wherein, ω is1、ω2Actual angular frequencies of the first through type in-phase power supply device and the second through type in-phase power supply device are respectively set;
the forms of formulae (13), (14) and (10) are identical, but note that P1refAnd P2refIs dynamically changed along with the movement of the locomotive, so that the actual output power P of the device ise1，Pe2And realizing the nearby power supply according to the dynamic change of the reference value.
In the embodiment of this example, as shown in fig. 5, a double-closed-loop control diagram of a single in-phase power supply device is shown, the active power output value, the reactive power output value, the active power given value, and the reactive power given value are used as inputs, frequency modulation and voltage regulation control is performed on each through-type in-phase power supply device based on a single-phase virtual synchronous machine VSG, the obtained voltage given value is used for a voltage effective value outer ring, and a double-ring control system of the voltage instantaneous value inner ring completes output control of the single through-type in-phase power supply device.
In the embodiment of the example, enough voltage support is provided for a traction network, a voltage source control mode is required for inverter output of the device, however, the impedance of a feeder line from the output end of a phase power supply device to the overhead line system is not negligible, the voltage fluctuation and distortion of the overhead line system can be caused by the locomotive load current which changes frequently and violently, the voltage stability and the dynamic characteristic of the overhead line system are difficult to meet the requirements only by controlling the overhead line system through an effective value closed loop and a phase-locked signal, and meanwhile, because the device output does not contain a hardware filter, the output voltage is multilevel step wave, the phase-locked precision is slightly reduced, and therefore, a double-loop control system which adopts a voltage effective value outer loop and a voltage instantaneous value inner loop is adopted to control the inverter voltage. The voltage instantaneous value inner ring is used for ensuring the sine degree and the dynamic characteristic of the output voltage, and the voltage effective value outer ring is used for improving the steady-state precision of voltage control.
Wherein, the effective value of the outer ring is given 27.5kV (calculated by the parallel control algorithm), the effective value of the output voltage is controlled by the PI regulator, the inner ring adopts the quasi-PR regulator for realizing the non-static control of the sinusoidal signal, as shown in fig. 6, it is a control block diagram of the through-type in-phase power supply device parallel VSG.
It should be noted that although the various steps of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these steps must be performed in this particular order, or that all of the depicted steps must be performed, to achieve desirable results. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions, etc.
Further, in the present exemplary embodiment, there is also provided a parallel control device of a through-type in-phase power supply device. Referring to fig. 7, the parallel control apparatus 400 of the through-type in-phase power supply apparatus may include: an active power given value calculation module 410, a single-phase power output value generation module 420 and a VSG-based parallel control module 430. Wherein:
an active power given value calculation module 410, configured to collect position information of the traction locomotive and each parallel through-type in-phase power supply device, and calculate active power given values of the multiple parallel through-type in-phase power supply devices based on the position information;
the single-phase power output value generation module 420 is configured to perform single-phase power calculation in a two-phase orthogonal system according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device, and generate an active power output value and a reactive power output value respectively;
and the VSG-based parallel control module 430 is used for performing frequency and voltage modulation control on each through-type in-phase power supply device based on the single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input, so as to complete the parallel control of the through-type in-phase power supply devices.
The specific details of each parallel control device module of the through-type in-phase power supply device are described in detail in a corresponding parallel control method of the through-type in-phase power supply device, and therefore, the details are not described herein again.
It should be noted that although in the above detailed description reference is made to several modules or units of a parallel control arrangement 400 of a pass-through in-phase supply arrangement, this division is not mandatory. Indeed, the features and functionality of two or more modules or units described above may be embodied in one module or unit, according to embodiments of the present disclosure. Conversely, the features and functions of one module or unit described above may be further divided into embodiments by a plurality of modules or units.
Furthermore, the above-described figures are merely schematic illustrations of processes involved in methods according to exemplary embodiments of the invention, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is to be limited only by the terms of the appended claims.
Claims (7)
1. A parallel control method for a through-type in-phase power supply device, the method comprising:
respectively collecting position information of a traction locomotive and each parallel through in-phase power supply device, and respectively calculating active power given values of the plurality of parallel through in-phase power supply devices on the basis of the position information;
according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated;
and performing frequency and voltage modulation control on each through-type in-phase power supply device based on a single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input, and completing the parallel control of the through-type in-phase power supply devices.
2. The method of claim 1, wherein the method further comprises:
based on a positioning device on a through type in-phase power supply device carrier, acquiring position information of a first through type in-phase power supply device, position information of a second through type in-phase power supply device and position information of a traction locomotive, and generating a position coefficient x according to the position information of the through type in-phase power supply device;
based on the position coefficient x, respectively calculating the active power given values of the first through type in-phase power supply device and the second through type in-phase power supply device which are connected in parallel to be
Wherein, P1ref、P2refThe active power given values of the first through type in-phase power supply device and the second through type in-phase power supply device are respectively set, P is the rated power value of a single through type in-phase power supply device, and d is the total length of a line.
3. The method of claim 1, wherein the method further comprises:
according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device, single-phase power calculation is carried out in a two-phase orthogonal system, and an active power output value and a reactive power output value are respectively generated as
Wherein u isα，uβThe voltage values i of the through-type in-phase power supply device under an orthogonal coordinate systemα，iβThe current values P of the through type in-phase power supply device under an orthogonal coordinate systemeFor the active power output value, Q, of the through-type in-phase power supply deviceeAnd outputting a reactive power output value for the through type in-phase power supply device.
4. The method of claim 1, wherein the method further comprises:
the frequency modulation control based on the VSG of the single-phase virtual synchronous machine is
Where ω is the actual angular frequency, ωNIs a rated angular frequency, J is a virtual moment of inertia, D is a damping coefficient, PrefFor a given value of active power of a through-type in-phase power supply device, tau is a time constant, DpThe sag factor:
5. the method of claim 2 or 4, wherein the method further comprises:
and performing frequency modulation control on the first through type in-phase power supply device and the second through type in-phase power supply device based on the single-phase virtual synchronous machine VSG by taking the active power output value and the active power given value as input
Wherein, ω is1、ω2Actual angular frequencies of the first through type in-phase power supply device and the second through type in-phase power supply device are respectively set;
and the parallel control of the through type in-phase power supply device is completed, and the nearby power supply of the first through type in-phase power supply device and the second through type in-phase power supply device is realized.
6. The method of claim 1, wherein the method further comprises:
and taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input, carrying out frequency and voltage modulation control on each through in-phase power supply device based on a single-phase virtual synchronous generator VSG, using the obtained voltage given value for the voltage effective value outer ring, and finishing the output control of the single through in-phase power supply device by a double-ring control system of the voltage instantaneous value inner ring.
7. A parallel control apparatus for a through-type in-phase power supply apparatus, comprising:
the active power given value calculation module is used for respectively acquiring position information of the traction locomotive and each parallel through-type in-phase power supply device and respectively calculating active power given values of the plurality of parallel through-type in-phase power supply devices on the basis of the position information;
the single-phase power output value generation module is used for performing single-phase power calculation in a two-phase orthogonal system according to the sampling voltage value and the sampling current value of each through-type in-phase power supply device and respectively generating an active power output value and a reactive power output value;
and the VSG-based parallel control module is used for performing frequency and voltage modulation control on each through-type in-phase power supply device based on a single-phase virtual synchronous machine VSG by taking the active power output value, the reactive power output value, the active power given value and the reactive power given value as input so as to complete the parallel control of the through-type in-phase power supply devices.
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