CN117811106B - Control method of in-phase power supply device and storage medium - Google Patents

Control method of in-phase power supply device and storage medium Download PDF

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CN117811106B
CN117811106B CN202311616519.8A CN202311616519A CN117811106B CN 117811106 B CN117811106 B CN 117811106B CN 202311616519 A CN202311616519 A CN 202311616519A CN 117811106 B CN117811106 B CN 117811106B
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current
power supply
voltage
phase power
active
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CN117811106A (en
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刘飞帆
周福林
马磊
熊进飞
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Southwest Jiaotong University
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Southwest Jiaotong University
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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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/48—Controlling the sharing of the in-phase component
    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
    • H02J3/50—Controlling the sharing of the out-of-phase component
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention provides a control method of an in-phase power supply device, which comprises the following steps: extracting a first active current component and a first active current component based on the output current, introducing an active compensation coefficient and a reactive compensation coefficient, and respectively obtaining a first active current instruction and a first active current instruction; extracting a second active current component and a second reactive current component based on the traction side converter current; obtaining a first voltage feedforward term based on traction side voltage extraction; inputting a difference value between the second active current component and the first active current instruction and a difference value between the second reactive current component and the first active current instruction into a PI regulator, and introducing a first voltage feedforward term and a first dq decoupling term to obtain a first modulated wave signal; the in-phase power supply device is controlled based on the first modulated wave signal. The invention solves the negative sequence problem and the reactive power problem, simultaneously decouples the impedance of the in-phase power supply device from the load impedance, and is convenient for the stability analysis of the in-phase power supply system.

Description

Control method of in-phase power supply device and storage medium
Technical Field
The invention relates to the technical field of control and impedance calculation of in-phase power supply devices, in particular to a control method and a storage medium of an in-phase power supply device.
Background
The in-phase power supply system not only solves the problem of excessive phase separation in the electrified railway system, but also compensates the electric energy quality, and is beneficial to improving the working efficiency and the working stability of the traction power supply system. In the in-phase power supply system, the in-phase power supply device is core equipment and is responsible for converting voltage phase, negative sequence compensation and reactive power compensation. In practical engineering applications, in-phase power supply devices are generally installed in traction substations.
The core topological structure of the in-phase power supply device is an AC-DC-AC converter which is responsible for converting one phase of voltage output by the traction transformer and connecting the same with the other phase output by the traction transformer, thereby eliminating the split-phase structure and completing the compensation of the electric energy quality through the current output of the control device. However, the in-phase power supply device is essentially power electronic equipment, the introduction of the in-phase power supply device changes the impedance distribution of the original system, and the embedding of a large number of power electronic equipment into the traction power supply system can definitely cause the problem of system stability.
The control strategy of the existing in-phase power supply device mainly selects to compensate the load current, so that the impedance of the in-phase power supply device and the load impedance are mutually coupled, namely, the impedance of the in-phase power supply device can change along with the topology of a train and the control mode, and the stability of the in-phase power supply system is difficult to analyze.
Disclosure of Invention
The invention provides a control method and a storage medium of an in-phase power supply device, which solve the problems of negative sequence and reactive power, simultaneously decouple the impedance of the in-phase power supply device from the load impedance, and facilitate the stability analysis of an in-phase power supply system.
A first aspect of embodiments of the present specification discloses a control method of an in-phase power supply device, including:
Obtaining output current of a direct power supply side of a traction transformer, current of each AC-DC-AC traction side converter and traction side voltage;
extracting and obtaining a first active current component and a first active current component based on the output current, introducing an active compensation coefficient and a reactive compensation coefficient, and respectively obtaining a first active current instruction and a first active current instruction;
Extracting a second active current component and a second reactive current component based on the traction side converter current;
Extracting a first voltage feedforward term based on the traction side voltage;
Acquiring a first dq decoupling term;
Inputting a difference value between the second active current component and the first active current instruction and a difference value between the second reactive current component and the first active current instruction into a PI regulator, and introducing a first voltage feedforward term and a first dq decoupling term to obtain a first modulated wave signal;
The in-phase power supply device is controlled based on the first modulated wave signal.
In some embodiments of the present disclosure, the method for controlling the in-phase power supply device further includes:
acquiring direct-current side voltage of an AC-DC-AC converter, side current of each AC-DC-AC power grid and side voltage of the power grid;
Based on the dc side voltage of the current transformer,
Inputting a difference value between an instruction value of the AC-DC-AC direct current bus voltage and the direct current side voltage of the converter into a PI regulator to obtain a second active current instruction;
Extracting a third active current component and a third reactive current component based on the grid-side current;
based on the power grid side voltage, extracting to obtain a second voltage feedforward term;
acquiring a second dq decoupling term;
inputting P I a difference value between the third active current component and the second active current instruction and a difference value between the third reactive current component and the second reactive current instruction into a regulator, and introducing a second voltage feedforward term and a second dq decoupling term to obtain a second modulated wave signal;
The in-phase power supply device is controlled based on the first modulated wave signal and the second modulated wave signal.
In some embodiments of the present description, based on the traction side voltage, a virtual beta component of the traction side voltage is obtained using an SOG I module, and a first voltage feedforward term under the dq frame is obtained through a phase-locked loop PLL and Park transformation.
In some embodiments of the present description, based on the output current, a virtual β component of the output current is obtained using an SOG I module, and the first active current component under the dq frame are obtained by a phase-locked loop PLL and Park transformation.
In some embodiments of the present description, a virtual beta component of the traction side converter current is obtained using an SOGI module based on the traction side converter current, and a second active current component and a second reactive current component in the dq frame are obtained by phase-locked loop PLL and Park conversion.
In some embodiments of the present description, the SOGI module is used to obtain a virtual β component of the grid-side voltage based on the grid-side voltage, and a second voltage feedforward term under the dq frame is obtained through a phase-locked loop PLL and Park transformation.
In some embodiments of the present description, the SOGI module is used to obtain a virtual β component of the grid-side current based on the grid-side current, and the third active current component and the third reactive current component in the dq frame are obtained by phase-locked loop PLL and Park transformation.
In some embodiments of the present description, the impedance calculation method includes:
Ignoring voltage disturbance of the direct current side of the AC-DC-AC converter, and equivalently enabling the in-phase power supply device to be an inverter;
The SOGI module is used for obtaining virtual beta components of traction side voltage V T, output current I α and traction side converter current I c, and a dq domain small signal model of the SOGI module is constructed as follows:
Wherein, the upper mark s represents the variable state after SOGI, and H vdq,Hidq,Hisdq represents the conversion matrix;
the small signal model of the dq domain of the PLL module is constructed as:
the superscript c indicates the control state, and G vpll,Gipll,Gispll,Gdpll is the transition matrix;
The dq domain small signal model of the current loop control module is constructed as follows:
wherein G ce,Gci,Gdei is a conversion matrix, and K dq is a compensation matrix;
the dq domain small signal model of the delay module is constructed as follows:
wherein G del is a delay matrix;
the dq domain small signal model of the main circuit is constructed as follows:
Wherein, Z cdq and Z sdq are inverter equivalent impedance and alpha-side power supply equivalent impedance respectively;
The impedance Z dq of the in-phase power supply device at the traction side alternating current port is obtained by combining the dq domain small signal models:
Wherein,
A second aspect of the embodiments of the present specification discloses a computer-readable storage medium storing computer instructions that, when read by a computer, perform a control method of the in-phase power supply apparatus of any one of the above.
In summary, the embodiment of the present disclosure may at least achieve the following beneficial effects:
The specification sets the voltage at one side converted by the in-phase power supply device as beta side, the voltage at the other side as alpha side, and controls the output current of the in-phase power supply device to realize negative sequence compensation and reactive power compensation by monitoring the output current at the alpha side; the in-phase power supply device consists of a plurality of AC-DC-AC converters, each converter can be divided into a traction side converter and a power grid side converter, wherein the power grid side converter is responsible for direct current side voltage balance, and the traction side converter is responsible for negative sequence compensation and reactive power compensation; the control method is characterized in that the impedance of the in-phase power supply device is not coupled with the load impedance any more in the control mode, and the impedance is only related to the alpha-side impedance and the output current, in other words, in the control mode, the impedance of the in-phase power supply device is irrelevant to the model and the control mode of a train, so that the stability problem of the in-phase power supply system can be conveniently analyzed; the control method introduces two parameters to respectively control the active current and the reactive current output by the in-phase power supply device so as to adapt to negative sequence compensation and reactive compensation under different scenes, and the impedance characteristic of the in-phase power supply device can be remodeled by adjusting the reactive compensation parameters, so that the stability of the system is improved. In the control mode, the disturbance of the DC side of the AC-DC-AC converter is ignored in the calculation of the impedance of the in-phase power supply device, and the in-phase power supply device is equivalent to an inverter when seen from an AC port of the converter at the traction side. The invention can realize negative sequence compensation and reactive compensation, and the impedance of the in-phase power supply device is decoupled from the load impedance, thereby facilitating stability analysis.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic circuit diagram of an in-phase power supply system according to the present invention.
Fig. 2 is a schematic circuit configuration diagram of the in-phase power supply device according to the present invention.
Fig. 3 is a schematic diagram of an equivalent circuit of the impedance of the in-phase power supply device according to the present invention.
Fig. 4 is a baud diagram of the admittance of the in-phase power supply device according to the present invention.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in numerous different ways without departing from the spirit or scope of the embodiments of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
The following disclosure provides many different implementations, or examples, for implementing different configurations of embodiments of the invention. In order to simplify the disclosure of embodiments of the present invention, components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit embodiments of the present invention. Furthermore, embodiments of the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
A first aspect of embodiments of the present specification discloses a control method of an in-phase power supply device, including:
Obtaining output current of a direct power supply side of a traction transformer, current of each AC-DC-AC traction side converter and traction side voltage;
extracting and obtaining a first active current component and a first active current component based on the output current, introducing an active compensation coefficient and a reactive compensation coefficient, and respectively obtaining a first active current instruction and a first active current instruction;
Extracting a second active current component and a second reactive current component based on the traction side converter current;
Extracting a first voltage feedforward term based on the traction side voltage;
Acquiring a first dq decoupling term; (dq decoupling term is wL, where w=2×pIxf is the power frequency angular frequency, L is the inductance value of the main circuit of the corresponding converter, both are constants)
Inputting a difference value between the second active current component and the first active current instruction and a difference value between the second reactive current component and the first active current instruction into a PI regulator, and introducing a first voltage feedforward term and a first dq decoupling term to obtain a first modulated wave signal; (the PI regulator can be realized by using a conventional PI regulator, the PI regulator is one type, and has no other requirement, and the main idea is that in terms of control instructions, the PI regulator no longer follows the load current, but follows the output current of direct power supply, so that the impedance of the in-phase power supply device is decoupled from the load impedance)
The in-phase power supply device is controlled based on the first modulated wave signal. (first modulated wave Signal controlling traction side converter)
In some embodiments, the control method of the in-phase power supply device further includes:
acquiring direct-current side voltage of an AC-DC-AC converter, side current of each AC-DC-AC power grid and side voltage of the power grid;
Based on the dc side voltage of the current transformer,
Inputting a difference value between an instruction value of the AC-DC-AC direct current bus voltage and the direct current side voltage of the converter into a PI regulator to obtain a second active current instruction; (the direct current bus voltage command value is set according to specific requirements and is constant without acquisition)
Extracting a third active current component and a third reactive current component based on the grid-side current;
based on the power grid side voltage, extracting to obtain a second voltage feedforward term;
Acquiring a second dq decoupling term; (dq decoupling term is wL, where w=2×pIxf is the power frequency angular frequency, L is the inductance value of the main circuit of the corresponding converter, both are constants)
Inputting P I a difference value between the third active current component and the second active current instruction and a difference value between the third reactive current component and the second reactive current instruction into a regulator, and introducing a second voltage feedforward term and a second dq decoupling term to obtain a second modulated wave signal;
The in-phase power supply device is controlled based on the first modulated wave signal and the second modulated wave signal. (first modulated wave signal controls traction-side converter and second modulated wave controls grid-side converter)
In some embodiments, based on the traction side voltage, a virtual beta component of the traction side voltage is obtained using an SOG I module, and a first voltage feedforward term under the dq frame is obtained by a phase-locked loop PLL and Park transformation.
In some embodiments, based on the output current, a virtual beta component of the output current is obtained using the SOGI module, and the first active current component in the dq frame are obtained by a phase-locked loop PLL and Park conversion.
In some embodiments, a virtual beta component of the traction side converter current is derived using the SOGI module based on the traction side converter current, and a second active current component and a second reactive current component in the dq frame are derived by phase locked loop PLL and Park conversion.
In some embodiments, based on the grid-side voltage, a virtual beta component of the grid-side voltage is obtained using the SOGI module, and a second voltage feed-forward term under the dq frame is obtained by a phase-locked loop PLL and Park transformation.
In some embodiments, based on the grid-side current, a virtual β component of the grid-side current is obtained using the SOGI module, and a third active current component and a third reactive current component in the dq frame are obtained by phase-locked loop PLL and Park conversion. ( The SOGI module is a conventional module for obtaining a beta virtual component, and the impedance calculation is performed according to a specific used module to perform theoretical calculation so as to obtain small signal model evaluation stability; the PLL module is a phase locked loop, a conventional module for capturing the voltage phase, in order to implement a subsequent control framework. Similarly, the impedance calculation is based on the specific modules used, including SOGI and PLL, and theoretical calculations are performed to obtain a small signal model to evaluate stability. )
In some embodiments, the impedance calculation method includes:
Ignoring voltage disturbance of the direct current side of the AC-DC-AC converter, and equivalently enabling the in-phase power supply device to be an inverter;
The SOGI module is used for obtaining virtual beta components of traction side voltage V T, output current I α and traction side converter current I c, and a dq domain small signal model of the SOGI module is constructed as follows:
Wherein, the upper mark s represents the variable state after SOGI, and H vdq,Hidq,Hisdq represents the conversion matrix;
the small signal model of the dq domain of the PLL module is constructed as:
the superscript c indicates the control state, and G vpll,Gipll,Gispll,Gdpll is the transition matrix;
The dq domain small signal model of the current loop control module is constructed as follows:
wherein G ce,Gci,Gdei is a conversion matrix, and K dq is a compensation matrix;
the dq domain small signal model of the delay module is constructed as follows:
wherein G del is a delay matrix;
the dq domain small signal model of the main circuit is constructed as follows:
Wherein, Z cdq and Z sdq are inverter equivalent impedance and alpha-side power supply equivalent impedance respectively;
The impedance Z dq of the in-phase power supply device at the traction side alternating current port is obtained by combining the dq domain small signal models:
Wherein,
A second aspect of the embodiments of the present specification discloses a computer-readable storage medium storing computer instructions that, when read by a computer, perform a control method of the in-phase power supply apparatus of any one of the above.
The technical conception of the invention is as follows:
The circuit schematic diagram of the in-phase power supply system is shown in fig. 1, and comprises a power grid, a traction transformer, an in-phase power supply device, a traction grid and a train. The in-phase power supply device is composed of a plurality of AC-DC-AC converters, the connection mode of each converter can be parallel or cascade connection, the connection mode does not influence the implementation of a control strategy, and the AC-DC-AC converters can be provided with transformers according to actual conditions so as to adapt to different voltage grades or power transmission. In order to meet the control requirement, a voltage transformer and a current transformer are arranged on the direct power supply side (alpha side) of the traction transformer, a voltage transformer and a current transformer are arranged on an alternating current port of the traction side converter in each AC-DC-AC converter, a voltage transformer and a current transformer are also arranged on an alternating current port of the power grid side converter, and a monitoring point is arranged on a direct current bus. Taking an AC-DC-AC converter module as an example, the circuit configuration of the AC-DC-AC converter module is shown in fig. 2, wherein the alpha-phase power supply and the beta-phase power supply are equivalent by using davin, the power grid side converter is responsible for balancing the voltage of the direct current side and can perform reactive compensation on the beta-side power supply, and the traction side converter is responsible for performing reactive compensation on the alpha-side power supply and the load. The specific active compensation and reactive compensation of the in-phase power supply device comprise the following steps:
The method comprises the steps of obtaining output current I α of a direct power supply side (alpha side) of a traction transformer, current I c of each AC-DC-AC traction side converter and voltage V T of the traction side, processing I α to obtain control instructions (namely Icd and Icq (Icref) below) of Ic, and obtaining modulated wave signals of alternating current ports of each traction side converter through control processing, wherein the specific process is as follows:
Extracting a first active current component I αd and a first active current component I αq from an output current I α on the alpha side, introducing an active compensation coefficient k d and a reactive compensation coefficient k q, and generating a first active current instruction First passive current command
The second active current component I cd and the second reactive current component I cq are extracted from the traction side converter ac port current I c.
The SOGI module is adopted to respectively obtain virtual beta components of each acquisition signal I α,Ic and V T, and the signals under the dq frame are obtained through phase-locked loop PLL and Park conversion VT＝{VTd,VTq},Iα＝{Iαd,Iαq},Ic＝{Icd,Icq}.
In the current loop control, an active current compensation parameter k d and a reactive current compensation parameter k q are introduced, and a current command value I cref＝{kdIαd,kqIαq (active current command) is generated from the output current on the α sideReactive current commandIs also known as a generic term for (c). If the negative sequence is completely compensated, the active current compensation parameter k d is set to be-1, so that the active current output by the in-phase power supply device is ensured to be equal to the active current output by the alpha side, and if the tolerable negative sequence quantity of the power grid is considered, k d can be adjusted according to actual needs. If the reactive compensation of the load and the alpha-side power supply is realized, a larger reactive current compensation parameter k q is set, so that the in-phase power supply device outputs more reactive current, and the reactive current output by the alpha-side is reduced. The compensation parameters k d and k q can be adjusted according to actual requirements, and the meaning of k d indicates that the input active current of the in-phase power supply device is k d times of the output active current of the alpha side, and the meaning of k q indicates that the input reactive current of the in-phase power supply device is k q times of the output reactive current of the alpha side.
The difference value between the second active current component and the first active current instruction is input into a PI regulator, the difference value between the second reactive current component and the first active current instruction is input into the PI regulator, and the first voltage feedforward term V T＝{VTd,VTq and the first dq decoupling term omega L c are introduced to obtain a first modulated wave signal D c＝{Dcd,Dcq.
The method comprises the steps of obtaining direct current side voltage V dc of an AC-DC-AC converter, obtaining grid side current I g and grid side voltage V G of each AC-DC-AC converter, and obtaining modulated wave signals of alternating current ports of each grid side converter through control processing, wherein the process is specifically as follows:
A third active current component I gd and a third reactive current component I gq are extracted from the grid-side converter ac port current I g.
The SOGI module is adopted to respectively obtain the virtual beta component of each acquisition signal I g,VG, and the signal V G＝{Vgd,Vgq},Ig＝{Igd,Igq under the dq frame is obtained through phase-locked loop PLL and Park conversion.
In the current loop control, the command value of the AC-DC-AC DC bus voltage is setThe difference value between the DC side voltage V dc and the DC side voltage V dc is input into a PI regulator to obtain a second active current instruction/>(DC voltage command value is set according to specific conditions, is constant and does not need to be acquired)
The difference between the third active current component and the second active current command is input to the PI regulator, the difference between the third reactive current component and the second reactive current command (the second reactive current command is considered as constant according to the specific compensation condition) is input to the PI regulator, and the second voltage feedforward term V G＝{Vgd,Vgq and the second dq decoupling term ωl g are introduced to obtain a second modulated wave signal D g＝{Dgd,Dgq.
Ignoring the voltage disturbances on the DC side of the AC-DC-AC converter, the in-phase supply device can be equivalent to an inverter, as shown in fig. 3. The impedance Z dq of the in-phase power supply device at the traction side alternating current port can be deduced, and the calculation steps comprise:
The system comprises an SOGI module, a PLL module, a current loop control module, a delay module and a small signal modeling of a main circuit (all are conventional modules, the main circuit is a circuit relation obtained according to a specific circuit diagram, the main circuit comprises two parts, (which can correspond to a diagram III), a first part is a current transformer, an outlet voltage VT of the current transformer=an equivalent resistance voltage Z cdq*Ic +an IGBT outlet voltage V dc x D, a second part is an equivalent circuit of a direct power supply part, and under a small signal model, the outlet voltage VT of the current transformer=an equivalent resistance voltage drop Zsdq x output current I α) and the system is specifically as follows:
The SOGI module is responsible for constructing a virtual beta component, the monitored signals are traction side voltage V T, alpha side output current I α and traction side converter current I c, and the dq domain small signal model is: wherein "-" represents small signal disturbance, the superscript s represents the variable state after going through the SOGI, and H vdq,Hidq,Hisdq represents the conversion matrix.
The PLL module is responsible for phase locking, and the small signal model of the dq domain is:
the superscript c indicates the control state, and G vpll,Gipll,Gispll,Gdpll is the transition matrix.
The dq domain small signal model of the current loop control module is:
Wherein G ce,Gci,Gdei is a conversion matrix and K dq is a compensation matrix.
The dq domain small signal model of the delay module is: Where G del is the delay matrix.
The dq domain small signal model of the main circuit is: Wherein Z cdq and Z sdq are the inverter equivalent impedance and the a-side power supply equivalent impedance, respectively.
The impedance of the alternating current port of the in-phase power supply device can be obtained by combining the modules is as follows:
the in-phase supply impedance is decoupled from the load impedance, which is related only to the grid impedance and the magnitude of the output current.
As shown in fig. 4, fig. 4 illustrates the advantageous effect of the proposed method, namely, by changing the setting of the compensation parameters k d and k q to reshape the impedance characteristics of the in-phase power supply device to adjust the stability margin of the system. The two examples in fig. 4 illustrate that adjusting k d and k q can eliminate the negative damping of the inverter qq channel, which is beneficial to improve the stability of the system. The graph of admittance of the in-phase power supply device under the dq frame under the proposed control strategy is shown in fig. 4, and it can be seen that when only active compensation is performed, namely k d＝-1,kq =0, the admittance characteristic of the device exhibits the characteristic of negative damping in the low frequency range of the qq channel; when active compensation and reactive compensation are carried out, namely k d＝-1,kq = -1, the admittance characteristic of the device is changed, and the qq channel is no longer in a negative damping characteristic. The above description, the proposed control strategy allows to remodel the admittance model of the plant by adjusting k d and k q, and since the train is running in unity power factor, the reactive power is very small, the change in k q hardly affects the steady state of the system.
The above embodiments are provided to illustrate the present invention and not to limit the present invention, so that the modification of the exemplary values or the replacement of equivalent elements should still fall within the scope of the present invention.
From the foregoing detailed description, it will be apparent to those skilled in the art that the present invention can be practiced without these specific details, and that the present invention meets the requirements of the patent statutes.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention. The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
It should be noted that the above description of the flow is only for the purpose of illustration and description, and does not limit the application scope of the present specification. Various modifications and changes to the flow may be made by those skilled in the art under the guidance of this specification. However, such modifications and variations are still within the scope of the present description.
While the basic concepts have been described above, it will be apparent to those of ordinary skill in the art after reading this application that the above disclosure is by way of example only and is not intended to be limiting. Although not explicitly described herein, various modifications, improvements, and adaptations of the application may occur to one of ordinary skill in the art. Such modifications, improvements, and modifications are intended to be suggested within the present disclosure, and therefore, such modifications, improvements, and adaptations are intended to be within the spirit and scope of the exemplary embodiments of the present disclosure.
Meanwhile, the present application uses specific words to describe embodiments of the present application. For example, "one embodiment," "an embodiment," and/or "some embodiments" means a particular feature, structure, or characteristic in connection with at least one embodiment of the application. Thus, it should be emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various positions in this specification are not necessarily referring to the same embodiment. Furthermore, certain features, structures, or characteristics of one or more embodiments of the application may be combined as suitable.
Furthermore, those of ordinary skill in the art will appreciate that aspects of the application are illustrated and described in the context of a number of patentable categories or conditions, including any novel and useful processes, machines, products, or materials, or any novel and useful improvements thereof. Accordingly, aspects of the present application may be implemented entirely in hardware, entirely in software (including firmware, resident software, micro-code, etc.) or a combination of hardware and software. The above hardware or software may be referred to as a "unit," module, "or" system. Furthermore, aspects of the present application may take the form of a computer program product embodied in one or more computer-readable media, wherein the computer-readable program code is embodied therein.
Computer program code required for operation of portions of the present application may be written in any one or more programming languages, including an object oriented programming language such as Java, scala, smalltalk, eiffel, JADE, emerald, C ++, c#, vb net, python, etc., a conventional programming language such as C programming language, visualBasic, fortran2103, perl, COBOL2102, PHP, ABAP, a dynamic programming language such as Python, ruby, and Groovy, or other programming languages, etc. The program code may execute entirely on the user's computer, or as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer may be connected to the user's computer through any form of network, such as a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet), or the use of services such as software as a service (SaaS) in a cloud computing environment.
Furthermore, the order in which the elements and sequences are presented, the use of numerical letters, or other designations are used in the application is not intended to limit the sequence of the processes and methods unless specifically recited in the claims. While certain presently useful inventive embodiments have been discussed in the foregoing disclosure, by way of example, it is to be understood that such details are merely illustrative and that the appended claims are not limited to the disclosed embodiments, but, on the contrary, are intended to cover all modifications and equivalent arrangements included within the spirit and scope of the embodiments of the application. For example, while the implementation of the various components described above may be embodied in a hardware device, it may also be implemented as a purely software solution, e.g., an installation on an existing server or mobile device.
Likewise, it should be noted that in order to simplify the presentation of the disclosure and thereby aid in understanding one or more inventive embodiments, various features are sometimes grouped together in a single embodiment, figure, or description thereof. This method of disclosure, however, is not to be interpreted as reflecting an intention that the claimed subject matter requires more features than are expressly recited in each claim. Rather, the inventive subject matter should be provided with fewer features than the single embodiments described above.

Claims (6)

1. A control method of an in-phase power supply device, characterized by comprising:
Obtaining output current of a direct power supply side of a traction transformer, current of each AC-DC-AC traction side converter and traction side voltage;
extracting and obtaining a first active current component and a first active current component based on the output current, introducing an active compensation coefficient and a reactive compensation coefficient, and respectively obtaining a first active current instruction and a first active current instruction;
Extracting a second active current component and a second reactive current component based on the traction side converter current;
Extracting a first voltage feedforward term based on the traction side voltage;
Acquiring a first dq decoupling term;
Inputting a difference value between the second active current component and the first active current instruction and a difference value between the second reactive current component and the first active current instruction into a PI regulator, and introducing a first voltage feedforward term and a first dq decoupling term to obtain a first modulated wave signal;
controlling the in-phase power supply device based on the first modulated wave signal;
based on the traction side voltage, a virtual beta component of the traction side voltage is obtained by using an SOGI module, and a first voltage feedforward term under a dq frame is obtained through phase-locked loop (PLL) and Park conversion;
Based on the output current, using an SOGI module to obtain a virtual beta component of the output current, and obtaining a first active current component and a first active current component under a dq frame through a phase-locked loop (PLL) and Park conversion; based on the traction side converter current, a virtual beta component of the traction side converter current is obtained by using an SOGI module, and a second active current component and a second reactive current component under a dq frame are obtained through phase-locked loop PLL and Park conversion.
2. The control method of an in-phase power supply apparatus according to claim 1, characterized by further comprising:
Acquiring direct-current side voltage of an AC-DC-AC converter, side current of each AC-DC-AC power grid and side voltage of the power grid; based on the dc side voltage of the current transformer,
Inputting a difference value between an instruction value of the AC-DC-AC direct current bus voltage and the direct current side voltage of the converter into a PI regulator to obtain a second active current instruction;
Extracting a third active current component and a third reactive current component based on the grid-side current;
based on the power grid side voltage, extracting to obtain a second voltage feedforward term;
acquiring a second dq decoupling term;
Inputting the difference value between the third active current component and the second active current instruction and the difference value between the third reactive current component and the second reactive current instruction into a PI regulator, and introducing a second voltage feedforward term and a second dq decoupling term to obtain a second modulated wave signal;
The in-phase power supply device is controlled based on the first modulated wave signal and the second modulated wave signal.
3. The method according to claim 2, wherein the virtual β component of the grid-side voltage is obtained using the SOGI module based on the grid-side voltage, and the second voltage feedforward term in the dq frame is obtained by the phase-locked loop PLL and Park conversion.
4. The control method of the in-phase power supply device according to claim 2, wherein the virtual β component of the grid-side current is obtained using the SOGI module based on the grid-side current, and the third active current component and the third reactive current component in the dq frame are obtained by the phase-locked loop PLL and Park conversion.
5. The control method of an in-phase power supply apparatus according to claim 1, wherein the impedance calculation method comprises:
Ignoring voltage disturbance of the direct current side of the AC-DC-AC converter, and equivalently enabling the in-phase power supply device to be an inverter; the SOGI module is used for obtaining virtual beta components of traction side voltage V T, output current I α and traction side converter current I c, and a dq domain small signal model of the SOGI module is constructed as follows:
Wherein, the upper mark s represents the variable state after SOGI, and H vdq,Hidq,Hisdq represents the conversion matrix;
the small signal model of the dq domain of the PLL module is constructed as:
the superscript c indicates the control state, and G vpll,Gipll,Gispll,Gdpll is the transition matrix;
The dq domain small signal model of the current loop control module is constructed as follows:
wherein G ce,Gci,Gdei is a conversion matrix, and K dq is a compensation matrix;
the dq domain small signal model of the delay module is constructed as follows:
wherein G del is a delay matrix;
the dq domain small signal model of the main circuit is constructed as follows:
Wherein, Z cdq and Z sdq are inverter equivalent impedance and alpha-side power supply equivalent impedance respectively; v dc is the DC side voltage of the AC-DC-AC converter;
The impedance Z dq of the in-phase power supply device at the traction side alternating current port is obtained by combining the dq domain small signal models:
Wherein,
6. A computer-readable storage medium storing computer instructions that, when read by a computer, perform the control method of the in-phase power supply apparatus according to any one of claims 1 to 5.
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