CN113364306A - Two-phase-single-phase intersection direct-alternating cascade converter system - Google Patents
Two-phase-single-phase intersection direct-alternating cascade converter system Download PDFInfo
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- CN113364306A CN113364306A CN202110680096.0A CN202110680096A CN113364306A CN 113364306 A CN113364306 A CN 113364306A CN 202110680096 A CN202110680096 A CN 202110680096A CN 113364306 A CN113364306 A CN 113364306A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- 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
- H02M5/02—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 without intermediate conversion into dc
- H02M5/04—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 without intermediate conversion into dc by static converters
- H02M5/10—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 without intermediate conversion into dc by static converters using transformers
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Abstract
The invention provides a two-phase-single-phase intersection direct-alternating cascade converter system, which belongs to the technical field of electrical control and comprises a three-phase-two-phase traction transformer, a multi-tap isolation transformer and a two-phase-single-phase intersection direct-alternating multi-module cascade converter; the two-phase-single-phase-intersection DC-AC cascade converter system provided by the invention can be applied to different power supply systems, can be compatible with the existing traditional partitioned power supply mode, can realize the connection between the existing two-phase traction transformer and a single-phase traction network, solves the problem of electric energy quality, and can realize the through traction power supply without passing through split phases of the traction network.
Description
Technical Field
The invention belongs to the technical field of electrical control, and particularly relates to a two-phase-single-phase intersection direct-alternating cascade converter system.
Background
The electric railway in China adopts a power frequency single-phase alternating current traction system at the initial stage. The traction substation converts three-phase 110kV (or 220kV) high-voltage alternating current into two single-phase 25kV alternating currents, and then supplies power to overhead contact networks in two directions of ascending and descending of a railway. Therefore, the traction transformer has a two-phase output characteristic.
Because the amplitude, frequency and phase of the supply voltage of the transformer are inconsistent among different traction substations and cannot be directly connected with each other, a large amount of excessive phases exist in the traction network. Although the same-phase power supply system replaces the two bridge arm power supply schemes in the substation with the bridge arm power supply scheme of the same phase, the phase passing through in the substation is cancelled, but different substations cannot be connected in a grid-connected mode. The through power supply can realize the grid-connected communication of the traction networks, the output traction networks of different substations are required to be communicated in a whole line, and the power supply system is a development direction of future electrified railway power supply.
The scheme utilizes the existing three-phase-two-phase traction transformer and provides a scheme for realizing a run-through power supply system based on a two-phase-single-phase cascade converter. The existing three-phase-two-phase traction transformer outputs two-phase voltage, the isolation transformer converts the two-phase voltage into two groups of isolated single-phase electricity, the two-phase-single-phase-intersected direct-alternating-current multi-module cascade converter enables the two groups of isolated single-phase electricity to pass through the alternating-direct-alternating-current converter, a plurality of direct currents are generated after the single-phase electricity is rectified and serve as the input end of the post-stage converter, a plurality of single-phase electricity are generated through single-phase inversion, a plurality of independent single-phase electricity output through inversion are connected in series and then output to a traction network, and the output direct-hanging traction network is achieved. Because the amplitude, the frequency and the phase of the voltage output by the cascade converter are completely controllable, the voltage can be connected with the output of other substations with similar structures in a grid-connected mode to form a through traction power supply system.
Disclosure of Invention
Aiming at the defects in the prior art, the two-phase-single-phase-intersected orthometric and orthometric cascade converter system provided by the invention can solve the problem of power quality and realize through traction power supply without passing through neutral section of a traction network.
In order to achieve the above purpose, the invention adopts the technical scheme that:
the scheme provides a two-phase-single-phase intersection orthometric and orthogonal cascade converter system which comprises a three-phase-two-phase traction transformer, a multi-tap isolation transformer and a two-phase-single-phase intersection orthometric and orthogonal multi-module cascade converter;
the primary side three-phase winding of the three-phase-two-phase traction transformer is respectively connected with the A-phase, the B-phase and the C-phase three-phase power grid voltage, the secondary side M-phase output winding of the three-phase-two-phase traction transformer is connected with the input winding of the M-phase multi-tap isolation transformer, and the secondary side T-phase output winding of the three-phase-two-phase traction transformer is connected with the input winding of the T-phase multi-tap isolation transformer; the output end of the M-phase multi-tap isolation transformer and the output end of the T-phase multi-tap isolation transformer are respectively connected with the input end of the M-phase cascade converter module and the input end of the T-phase cascade converter module of the two-phase-single-phase intersection orthometric-orthogonal multi-module cascade converter in a one-to-one correspondence manner; the positive output end of the M-phase cascade converter module of the two-phase-single-phase intersection orthometric and multiple-module cascade converter is connected with a contact net through a filter inductor, and the negative end of the M-phase cascade converter module is connected with the positive output end of the T-phase cascade converter module; and the output negative end of the T-phase cascade converter module of the two-phase-single-phase intersection orthometric and multiple-module cascade converter is connected with a rail.
Furthermore, the output end of the M-phase multi-tap isolation transformer comprises n sub-output ports which are sequentially arranged and mutually isolated; the output end of the T-phase multi-tap isolation transformer comprises n sub-output ports which are sequentially arranged and mutually isolated.
Furthermore, the M-phase cascade converter module of the two-phase-single-phase orthogonal multi-module cascade converter comprises n M-phase cascade converter sub-modules which are connected in sequence; the T-phase cascade converter module of the two-phase-single-phase-intersection orthometric and multiple-module cascade converter comprises n T-phase cascade converter submodules which are connected in sequence.
Furthermore, each M-phase cascade converter submodule has the same structure and comprises a single-phase rectification unit, a direct-current capacitor and a single-phase inversion unit;
the sub-output ends of the M-phase multi-tap isolation transformer are respectively connected with the input ends of the single-phase rectifying units Mi in a one-to-one correspondence manner; the output end Mic of the single-phase rectification unit Mi is respectively connected with the direct current capacitor CαiIs connected with the input end Nia of the single-phase inversion unit Ni, and the output end Mid of the single-phase rectification unit Mi is respectively connected with the direct current capacitor CαiThe other end of the single-phase inverter unit is connected with an input end Nib of the single-phase inverter unit Ni; the negative output terminal Nid of the single-phase inversion unit Ni and the (i + 1) th single-phase inversion unitThe positive output terminals are connected, when i is equal to 1, the positive output terminal N1c of the single-phase inverter unit N1 is connected with a catenary through a filter inductor, and when i is equal to N, the negative output terminal Nnd of the single-phase inverter unit Nn is connected with the T-phase cascaded sub-modules, wherein i is equal to 1, 2, …, N, and N represents the total number of M-phase cascaded converter sub-modules.
Furthermore, the T-phase cascaded converter submodules have the same structure and respectively comprise a single-phase rectification unit, a direct-current capacitor and a single-phase inversion unit;
the sub-output ends of the T-phase multi-tap isolation transformer are respectively connected with the input ends of the single-phase rectification units Ti in a one-to-one correspondence manner; the output end Tic of the single-phase rectification unit Ti is respectively connected with the direct current capacitor CβiIs connected with the input end Sia of the single-phase inversion unit Si, and the output end Tid of the single-phase rectification unit Ti is respectively connected with the direct current capacitor CβiThe other end of the single-phase inverter unit is connected with an input end Sib of the single-phase inverter unit Si; the output positive terminal Sic of the single-phase inverter unit Si is connected to the output negative terminal of the i-1 th single-phase inverter unit, when i is 1, the output terminal positive terminal S1c of the single-phase inverter unit S1 is connected to the output negative terminal Nnd of the single-phase inverter unit Ni when i is n, and when i is n, the output negative terminal Snd of the single-phase inverter unit Sn is connected to the rail, where i is 1, 2, …, n, and n represents the total number of T-phase cascaded converter sub-modules.
Further, the M-phase cascaded converter sub-module is used for adjusting the amplitude, the frequency and the phase of the output voltage, and the T-phase cascaded converter sub-module is used for adjusting the amplitude, the frequency and the phase of the output voltage.
Further, the three-phase to two-phase traction transformer is any one of traction transformers having two-phase output characteristics.
The invention has the beneficial effects that:
(1) the three-phase traction transformer is adopted to convert A-phase, B-phase and C-phase three-phase power grid alternating current into M-phase and T-phase two-phase alternating current for output, single-phase rectifier units in the M-phase cascade submodule and the T-phase cascade submodule are utilized to convert the alternating current into direct current, and single-phase inverter units in the M-phase cascade submodule and the T-phase cascade submodule are utilized to convert the direct current into the alternating current;
(2) the output ends of the single-phase inverters in the M-phase cascade submodule and the T-phase cascade submodule are sequentially connected in series, so that the M-phase output voltage and the T-phase output voltage are in the same frequency and the same phase, a step-up transformer is not needed, the M-phase output voltage and the T-phase output voltage can be directly merged into a traction network, and the through power supply of a full-line substation is realized;
(3) in practical application, the invention can be compatible with the traditional subarea power supply mode to solve the problem of power quality, and can also form a through traction power supply system to solve the problem of power quality and completely eliminate passing neutral section in a whole line.
(4) The voltage amplitude, the frequency and the phase output by the two-phase-single-phase intersecting direct-alternating-current multi-module cascade converter are completely controllable, so that the two-phase-single-phase intersecting direct-alternating-current multi-module cascade converter can be connected with the output of other substations with similar structures in a grid-connected mode to form a through traction power supply system.
(5) The invention has certain practical guiding significance for the development of the electrified railway in China and is also beneficial to inhibiting the influence of the traction load electric energy quality problem on a three-phase power grid.
Drawings
Fig. 1 is a circuit topology diagram of a two-phase-single-phase-intersecting orthogonal-multiple-module cascaded converter according to an embodiment of the present invention.
Fig. 2 is a diagram of an application manner compatible with conventional partition traction power supply in the embodiment of the present invention.
Fig. 3 is a diagram of an application mode of the through traction power supply in the embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Example 1
As shown in fig. 1, a two-phase-single-phase-intersected dc-ac cascaded converter system is provided, which includes a three-phase-two-phase traction transformer, a multi-tap isolation transformer, and a two-phase-single-phase-intersected dc-ac multi-module cascaded converter;
the primary side three-phase winding of the three-phase-two-phase traction transformer is respectively connected with the A-phase, the B-phase and the C-phase three-phase power grid voltage, the secondary side M-phase output winding of the three-phase-two-phase traction transformer is connected with the input winding of the M-phase multi-tap isolation transformer, and the secondary side T-phase output winding of the three-phase-two-phase traction transformer is connected with the input winding of the T-phase multi-tap isolation transformer; the output end of the M-phase multi-tap isolation transformer and the output end of the T-phase multi-tap isolation transformer are respectively connected with the input end of the M-phase cascade converter module and the input end of the T-phase cascade converter module of the two-phase-single-phase intersection orthometric-orthogonal multi-module cascade converter in a one-to-one correspondence manner; the positive output end of the M-phase cascade converter module of the two-phase-single-phase intersection orthometric and multiple-module cascade converter is connected with a contact net through a filter inductor, and the negative end of the M-phase cascade converter module is connected with the positive output end of the T-phase cascade converter module; and the output negative end of the T-phase cascade converter module of the two-phase-single-phase intersection orthometric and multiple-module cascade converter is connected with a rail.
The output end of the M-phase multi-tap isolation transformer comprises n sub-output ends alpha 1, alpha 2, alpha 3, … and alpha n which are sequentially arranged and mutually isolated; the output end of the T-phase multi-tap isolation transformer comprises n sub-output ends beta 1, beta 2, beta 3, … and beta n which are sequentially arranged and isolated from each other.
The M-phase cascade converter module of the two-phase-single-phase-intersected orthometric-orthogonal multi-module cascade converter comprises n M-phase cascade converter sub-modules which are sequentially connected; the T-phase cascade converter module of the two-phase-single-phase-intersection orthometric and multiple-module cascade converter comprises n T-phase cascade converter submodules which are connected in sequence.
The M-phase cascaded converter submodules have the same structure and respectively comprise a single-phase rectification unit, a direct-current capacitor and a single-phase inversion unit;
the sub-output ends of the M-phase multi-tap isolation transformer are respectively connected with the input ends of the single-phase rectifying units Mi in a one-to-one correspondence manner; the output end Mic of the single-phase rectification unit Mi is respectively connected with the direct current capacitor CαiOne terminal of and single-phase inversion unitThe input end Nia of the Ni is connected, and the output end Mid of the single-phase rectification unit Mi is respectively connected with the direct current capacitor CαiThe other end of the single-phase inverter unit is connected with an input end Nib of the single-phase inverter unit Ni; the output negative terminal Nid of the single-phase inverter unit Ni is connected to the output positive terminal of the (i + 1) th single-phase inverter unit, when i is 1, the output positive terminal N1c of the single-phase inverter unit N1 is connected to a catenary through a filter inductor, and when i is N, the output negative terminal Nnd of the single-phase inverter unit Nn is connected to the T-phase cascade sub-module, where i is 1, 2, …, N, and N represents the total number of M-phase cascade converter sub-modules.
The T-phase cascade submodules have the same structure and respectively comprise a single-phase rectification unit, a direct-current capacitor and a single-phase inversion unit;
the sub-output ends of the T-phase multi-tap isolation transformer are respectively connected with the input ends of the single-phase rectification units Ti in a one-to-one correspondence manner; the output end Tic of the single-phase rectification unit Ti is respectively connected with the direct current capacitor CβiIs connected with the input end Sia of the single-phase inversion unit Si, and the output end Tid of the single-phase rectification unit Ti is respectively connected with the direct current capacitor CβiThe other end of the single-phase inverter unit is connected with an input end Sib of the single-phase inverter unit Si; the output positive terminal Sic of the single-phase inverter unit Si is connected to the output negative terminal of the i-1 th single-phase inverter unit, when i is equal to 1, the output positive terminal S1c of the single-phase inverter unit S1 is connected to the output negative terminal Nnd of the single-phase inverter unit Ni when i is equal to n, and when i is equal to n, the output negative terminal Snd of the single-phase inverter unit Sn is connected to a rail, where i is equal to 1, 2, …, n, and n represents the total number of T-phase cascaded converter sub-modules.
The M-phase cascaded converter submodule is used for adjusting the amplitude, the frequency and the phase of the output voltage, and the T-phase cascaded converter submodule is used for adjusting the amplitude, the frequency and the phase of the output voltage.
The input end of the M-phase cascade transformer module of the two-phase-single-phase-intersection direct-alternating-current multi-module cascade converter consists of n single-phase rectifier modules which are respectively a single-phase rectifier module M1, a single-phase rectifier module M2, a single-phase rectifier module … and a single-phase rectifier module Mn and are respectively used as a direct-current capacitor Cα1DC capacitor Cα2… and a DC capacitor CαnProviding a straightCurrent voltage vα1D.c. voltage vα2… and a DC voltage vαn；
The input end of the T-phase cascade transformer module of the two-phase-single-phase-intersection DC-AC multi-module cascade converter consists of n single-phase rectifier modules which are respectively a single-phase rectifier module T1, a single-phase rectifier module T2 … and a single-phase rectifier module Tn and are respectively used for being a DC capacitor Cβ1DC capacitor Cβ2… and a DC capacitor CβnProviding a direct voltage vβ1D.c. voltage vβ2… and a DC voltage vβn。
The single-phase output end of the two-phase-single-phase intersection orthometric multi-module cascade converter comprises an output end of an M-phase cascade transformer module and an output end of a T-phase cascade transformer module, and both adopt a cascade structure;
the output end of the M-phase cascade transformer module consists of N single-phase inverters, namely a single-phase inverter N1, single-phase inverters N2, … and a single-phase inverter Nn;
the output end of the T-phase cascade transformer module consists of n single-phase inverters, namely a single-phase inverter S1, single-phase inverters S2, … and a single-phase inverter Sn;
the three-phase-two-phase traction transformer is any traction transformer with two-phase output characteristics, such as a Vv transformer, an YNd11 transformer or an YNd transformer.
In one embodiment of the invention
The invention provides a scheme for realizing a run-through power supply system based on a two-phase-single-phase cascade converter by utilizing an existing three-phase-two-phase traction transformer.
The invention adopts a three-phase-two-phase traction transformer to convert A-phase, B-phase and C-phase three-phase power grid alternating current into M-phase and T-phase alternating current for output, a multi-tap isolation transformer converts two-phase voltage into two groups of isolated single-phase electricity, single-phase rectifier units in an M-phase cascade submodule and a T-phase cascade submodule are utilized to convert the alternating current into a plurality of direct currents, and single-phase inverter units in the M-phase cascade submodule and the T-phase cascade submodule are utilized to convert the direct currents into a plurality of alternating currents; the output ends of the single-phase inverters in the M-phase cascade submodule and the T-phase cascade submodule are sequentially connected in series and then output to a traction network through a filter inductor, and the single-phase inverters can be directly merged into the traction network without adopting a step-up transformer, so that the through power supply of the whole-line substation is realized.
In another embodiment of the invention
As shown in fig. 2, the invention can be applied to different power supply systems, can be compatible with the existing traditional partition power supply mode, and can realize four-quadrant operation due to the fact that the ac-dc-ac cascade converter can realize four-quadrant operation, so that functional quantity can bidirectionally flow between a three-phase power grid and a traction grid, reactive energy of a traction load cannot be transferred to the three-phase power grid, and the three-phase power grid can operate under a unit power factor, thereby solving the problem of electric energy quality.
In another embodiment of the invention
As shown in fig. 3, the single-phase inverter in the ac-dc-ac cascade converter can provide the required reactive energy and harmonic for the locomotive load, and the amplitude, phase and frequency of the voltage output by the single-phase inverter are adjustable, so that the through in-phase power supply of the whole line is realized, the problem of power quality is solved, and the passing phase is completely cancelled in the whole line.
Because the amplitude, the frequency and the phase of the voltage output by the cascade converter are completely controllable, the voltage can be connected with the output of other substations with similar structures in a grid-connected mode to form a through traction power supply system. The invention has certain practical guiding significance for the development of the electrified railway in China and is also beneficial to inhibiting the influence of the traction load electric energy quality problem on a three-phase power grid.
Claims (7)
1. A two-phase-single-phase intersection direct-alternating cascade converter system is characterized by comprising a three-phase-two-phase traction transformer, a multi-tap isolation transformer and a two-phase-single-phase intersection direct-alternating multi-module cascade converter;
the primary side three-phase winding of the three-phase-two-phase traction transformer is respectively connected with the A-phase, the B-phase and the C-phase three-phase power grid voltage, the secondary side M-phase output winding of the three-phase-two-phase traction transformer is connected with the input winding of the M-phase multi-tap isolation transformer, and the secondary side T-phase output winding of the three-phase-two-phase traction transformer is connected with the input winding of the T-phase multi-tap isolation transformer; the output end of the M-phase multi-tap isolation transformer and the output end of the T-phase multi-tap isolation transformer are respectively connected with the input end of the M-phase cascade converter module and the input end of the T-phase cascade converter module of the two-phase-single-phase intersection orthometric-orthogonal multi-module cascade converter in a one-to-one correspondence manner; the positive output end of the M-phase cascade converter module of the two-phase-single-phase intersection orthometric and multiple-module cascade converter is connected with a contact net through a filter inductor, and the negative end of the M-phase cascade converter module is connected with the positive output end of the T-phase cascade converter module; and the output negative end of the T-phase cascade converter module of the two-phase-single-phase intersection orthometric and multiple-module cascade converter is connected with a rail.
2. The two-phase-single-phase orthogonal cascade conversion system according to claim 1, wherein the output terminal of the M-phase multi-tap isolation transformer comprises n sequentially arranged sub-output terminals isolated from each other; the output end of the T-phase multi-tap isolation transformer comprises n sub-output ends which are sequentially arranged and mutually isolated.
3. The two-phase-single-phase orthogonal cascade conversion system according to claim 1, wherein the M-phase cascade converter module of the two-phase-single-phase orthogonal multi-module cascade converter comprises n M-phase cascade converter sub-modules connected in sequence; the T-phase cascade converter module of the two-phase-single-phase-intersection orthometric and multiple-module cascade converter comprises n T-phase cascade converter submodules which are connected in sequence.
4. The two-phase-single-phase-intersected DC-AC cascade conversion system according to claim 3, wherein each M-phase cascade converter submodule has the same structure and comprises a single-phase rectification unit, a DC capacitor and a single-phase inversion unit;
the sub-output ends of the M-phase multi-tap isolation transformer are respectively connected with the input ends of the single-phase rectifying units Mi in a one-to-one correspondence manner; the output end Mic of the single-phase rectification unit Mi is respectively connected with the direct current capacitor CαiIs connected with the input end Nia of the single-phase inversion unit Ni, and the output end Mid of the single-phase rectification unit Mi is respectively connected with the direct currentCapacitor CαiThe other end of the single-phase inverter unit is connected with an input end Nib of the single-phase inverter unit Ni; the output negative terminal Nid of the single-phase inverter unit Ni is connected to the output positive terminal of the (i + 1) th single-phase inverter unit, when i is 1, the output positive terminal N1c of the single-phase inverter unit N1 is connected to a catenary through a filter inductor, and when i is N, the output negative terminal Nnd of the single-phase inverter unit Nn is connected to the T-phase cascade sub-module, where i is 1, 2, …, N, and N represents the total number of M-phase cascade converter sub-modules.
5. The two-phase-single-phase-intersected DC-AC cascade conversion system according to claim 3, wherein each T-phase cascade converter submodule has the same structure and comprises a single-phase rectification unit, a DC capacitor and a single-phase inversion unit;
the sub-output ends of the T-phase multi-tap isolation transformer are respectively connected with the input ends of the single-phase rectification units Ti in a one-to-one correspondence manner; the output end Tic of the single-phase rectification unit Ti is respectively connected with the direct current capacitor CβiIs connected with the input end Sia of the single-phase inversion unit Si, and the output end Tid of the single-phase rectification unit Ti is respectively connected with the direct current capacitor CβiThe other end of the single-phase inverter unit is connected with an input end Sib of the single-phase inverter unit Si; the output positive terminal Sic of the single-phase inverter unit Si is connected to the output negative terminal of the i-1 th single-phase inverter unit, when i is 1, the output terminal positive terminal S1c of the single-phase inverter unit S1 is connected to the output negative terminal Nnd of the single-phase inverter unit Ni when i is n, and when i is n, the output negative terminal Snd of the single-phase inverter unit Sn is connected to the rail, where i is 1, 2, …, n, and n represents the total number of T-phase cascaded converter sub-modules.
6. The two-phase-single-phase-intersecting orthometric-orthogonal cascade converter system of any one of claims 4-5, wherein the M-phase cascade converter submodule is used for adjusting the amplitude, frequency and phase of the output voltage, and the T-phase cascade converter submodule is used for adjusting the amplitude, frequency and phase of the output voltage.
7. The two-phase-single-phase-intersecting dc-ac cascade converter system of claim 1, wherein the three-phase-two-phase traction transformer is any one of traction transformers with two-phase output characteristics.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865896A (en) * | 2021-10-29 | 2021-12-31 | 上海电器科学研究所（集团）有限公司 | Urban rail transit traction system combination test platform |
| CN114204827A (en) * | 2022-01-10 | 2022-03-18 | 西南交通大学 | Non-isolated cascade two-phase-single-phase converter and railway traction power supply system |
| CN114553047A (en) * | 2022-01-21 | 2022-05-27 | 东北电力大学 | Three-phase AC-DC converter based on three-phase transformer cascade connection |
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| CN113865896A (en) * | 2021-10-29 | 2021-12-31 | 上海电器科学研究所（集团）有限公司 | Urban rail transit traction system combination test platform |
| CN114204827A (en) * | 2022-01-10 | 2022-03-18 | 西南交通大学 | Non-isolated cascade two-phase-single-phase converter and railway traction power supply system |
| CN114204827B (en) * | 2022-01-10 | 2023-03-14 | 西南交通大学 | Non-isolated cascade two-phase-single-phase converter and railway traction power supply system |
| CN114553047A (en) * | 2022-01-21 | 2022-05-27 | 东北电力大学 | Three-phase AC-DC converter based on three-phase transformer cascade connection |
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