CN110336473B - Low-voltage power supply special for railway and semi-closed loop control method - Google Patents
Low-voltage power supply special for railway and semi-closed loop control method Download PDFInfo
- Publication number
- CN110336473B CN110336473B CN201910624020.9A CN201910624020A CN110336473B CN 110336473 B CN110336473 B CN 110336473B CN 201910624020 A CN201910624020 A CN 201910624020A CN 110336473 B CN110336473 B CN 110336473B
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage
- power supply
- converter module
- converter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
-
- 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
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
-
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Rectifiers (AREA)
Abstract
The invention relates to a railway special low-voltage power supply and a semi-closed loop control method, wherein a main circuit of the railway special low-voltage power supply comprises seven converter modules M1, five connecting reactors L, three coupling capacitors C, a single-phase uncontrollable rectifier bridge, a three-phase uncontrollable rectifier bridge, three output filter modules F and a common inductor Lm. The power supply performs PWM rectification on a converter module M1 by adopting a rectification PWM closed-loop voltage-stabilizing control algorithm, and a single-phase uncontrollable rectifier bridge performs current supplement reflux; meanwhile, a voltage boosting semi-closed loop control algorithm is adopted to realize internal voltage boosting on the three converter modules M1 by using a connecting reactance L and a coupling capacitor C; and finally, the three converter modules M1 are used for outputting three-phase 380V voltage by adopting a PWM closed-loop inversion control algorithm, so that a stable alternating current power supply is provided for a railway low-voltage power system, the structure is simple and ingenious, the implementation is easy, the implementation cost is low, and the expansion and the popularization and application are facilitated.
Description
Technical Field
The invention belongs to the technical field of electrified railway low-voltage power distribution, and particularly relates to a railway special low-voltage power supply and a semi-closed loop control method.
Background
Railway power distribution is always an important component in the field of railway power supply, and railway signal equipment, information equipment, communication equipment, tunnel ventilation, illumination, turnout snow melting and the like all need a railway low-voltage 380V power supply. Wherein, part of the first-stage load needs two or even three independent power supplies to supply power. However, in areas such as Xinjiang, Tibet and Qinghai, the surrounding environment is severe, and the construction project of the public power grid is lacked, so that the low-voltage power supply is difficult to obtain. However, in order to meet the design requirements, multiple power supplies must be connected for power supply, and the contradiction is not always relieved.
In the conventional measure, a transformer of 27.5/0.22kV or 27.5/0.4kV is adopted for power supply. On one hand, 27.5kV is affected by the impact and nonlinearity of the railway locomotive, voltage fluctuation and voltage harmonic exist, the voltage quality of 0.22kV and 0.4kV sides is deteriorated, and a series of low-voltage loads cannot work reliably. On the other hand, partial load requires a three-phase 380V power supply, and the 27.5/0.4kV transformer can only be obtained in partial traction substations and cannot be obtained in subareas along AT substations, so that the application range of the transformer is limited.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the railway special low-voltage power supply which is applicable to single-phase input and three-phase input occasions, provides a stable 380V power supply for a railway low-voltage power distribution system, has a simple and ingenious structure, is easy to realize, and has low realization cost, and the semi-closed loop control method of the railway special low-voltage power supply.
In order to solve the technical problems, the invention adopts the following technical scheme:
a low-voltage power supply special for railways comprises a main circuit, wherein the main circuit consists of seven converter modules M1, five connecting reactors L, three coupling capacitors C, a single-phase uncontrollable rectifier bridge, a three-phase uncontrollable rectifier bridge, three output filter modules F and a common inductor Lm; the input end of a first converter module M1 is provided with a first connecting reactor L and a second connecting reactor L which are respectively connected to the phase A and the phase C on the input side, the output end of the first converter module M1 is connected in parallel with a single-phase uncontrollable rectifier bridge, the alternating current side of the single-phase uncontrollable rectifier bridge is connected to the phase B on the input side, meanwhile, the direct current side of the single-phase uncontrollable rectifier bridge is connected in parallel with a second converter module M1, a third converter module M1 and a fourth converter module M1, one bridge arm of the second converter module M1, the third converter module M1 and the fourth converter module M1 is provided with a third connecting reactor L, a fourth connecting reactor L and a fifth connecting reactor respectively, and the third connecting reactor L, the fourth connecting reactor L and the fifth connecting reactor L are connected to the first coupling capacitor C through the third connecting reactor L, the fourth connecting reactor L and the fifth connecting reactor L, The p point of the second coupling capacitor C and the third coupling capacitor C; the other leg of the second, third and fourth converter module M1, M1, M1 is connected to q-point of the first, second and third coupling capacitor C, respectively; meanwhile, the p points of the first coupling capacitor C, the second coupling capacitor C and the third coupling capacitor C are respectively connected to the phase A, the phase B and the phase C on the input side, and the q points of the first coupling capacitor C, the second coupling capacitor C and the third coupling capacitor C are connected to the input end of the three-phase uncontrollable rectifier bridge; the output end of the three-phase uncontrollable rectifier bridge is connected with a large-capacity energy storage capacitor in parallel, two ends of the large-capacity energy storage capacitor are connected with a fifth converter module M1, a sixth converter module M1 and a seventh converter module M1 in parallel, and the alternating current sides of the fifth converter module M1, the sixth converter module M1 and the seventh converter module M1 are respectively provided with a first filter module F, a second filter module F and a third filter module F; one output end of the first filter module F, one output end of the second filter module F and one output end of the third filter module F are respectively an A-phase output end, a B-phase output end and a C-phase output end of the low-voltage power supply, the other output end of the first filter module F, the second filter module F and the third filter module F forms a star point and leads out a ground wire used as the low-voltage power supply, and meanwhile, the star point leads out an N-phase output end used as the low-voltage power.
Further, each of the seven converter modules M1 is composed of 4 IGBTs and energy storage capacitors, and 4 IGBTs constitute a single-phase fully-controlled H-bridge, and the energy storage capacitors are connected in parallel to the dc side of the single-phase fully-controlled H-bridge.
Furthermore, each of the three output filter modules F is composed of a filter inductor, a filter capacitor and a damping resistor, the input end of the filter inductor is used as the input end of the filter module F, and the output end of the filter inductor is connected in parallel with the filter capacitor and the damping resistor which are connected in series.
Furthermore, the input side of the railway special low-voltage power supply adopts A, B, C three-phase input, or adopts A phase to be connected with a live wire, B phase to be connected with the single-phase input of a zero line and C phase to be suspended, or when high power is required, A and C are connected in parallel to be connected with the live wire, and B phase to be connected with the zero line.
A semi-closed loop control method of a railway special low-voltage power supply comprises the steps of firstly utilizing a full-control rectification PWM voltage stabilization control method to carry out high-power energy gathering, then carrying out voltage boosting semi-closed loop control, specifically adopting a semi-closed loop PWM inversion control algorithm to generate compensation voltage in the semi-closed loop PWM voltage stabilization control method, compensating dropped voltage, coupling the compensated voltage by adopting a capacitor, then carrying out three-phase uncontrollable rectification on the coupled and boosted voltage, and finally outputting rectified direct-current voltage through three-phase split-phase inversion so as to be suitable for unbalanced loads.
Further, the full-control rectification PWM voltage stabilization control method specifically includes that the stabilization of direct-current side voltage is realized through A-phase and C-phase full-control PWM rectification and B-phase uncontrollable rectification; the voltage boosting semi-closed loop control is applied to 3 converter modules M1 connected with a single-phase uncontrollable rectifier bridge in parallel, and if the depth of voltage at an input side is S volts, the corresponding direct-current voltage is D volts at the moment, and the duty ratio output by the 3 converter modules M1 is S/D all the time; the three-phase split-phase inversion output is a PWM inversion control algorithm, and is particularly applied to 3 converter modules M1 connected with a three-phase uncontrollable rectifier bridge and a high-capacity energy storage capacitor in parallel to output stable three phases of 380V.
The invention has the beneficial effects that:
through the technical scheme, the invention can be applied to the electrified railway and can be suitable for single-phase input and three-phase input occasions, provides a stable 380V power supply for a railway low-voltage distribution system, realizes internal voltage promotion, does not need to increase the number of sensors, saves materials, enables the power supply structure to be simpler and more ingenious, simultaneously adopts a plurality of same converter modules M1 and the like, realizes modular design and installation, is beneficial to maintenance, production and assembly, effectively reduces the processing difficulty and cost, and is beneficial to popularization and application and expansion.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the railway-specific low-voltage power supply of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1:
the low-voltage power supply special for railways comprises a main circuit 100, wherein the main circuit 100 comprises seven converter modules M1 (namely, a first converter module M11, a second converter module M15, a third converter module M16, a fourth converter module M17, a fifth converter module M116, a sixth converter module M117 and a seventh converter module M118), five connecting reactors L (namely, a first connecting reactor L2, a second connecting reactor L3, a third connecting reactor L8, a fourth connecting reactor L9 and a fifth connecting reactor L10), three coupling capacitors C (namely, a first coupling capacitor C11, a second coupling capacitor C12 and a third coupling capacitor C13), a single-phase uncontrollable rectifier bridge, a three-phase uncontrollable rectifier bridge and three output filter modules F (namely, a first filter module F19, a second filter module F19, a third filter module M3925, a fourth converter module M17, a fifth converter module M116, a sixth converter module M117 and a seventh converter module, A second filter module F20 and a third filter module F21) and a common inductor Lm; the input end of a first converter module M11 is provided with a first connecting reactor L2 and a second connecting reactor L3 which are respectively connected to the phase A and the phase C on the input side, the output end of the first converter module M11 is connected in parallel with a single-phase uncontrollable rectifier bridge 4, the alternating current side of the single-phase uncontrollable rectifier bridge 4 is connected to the phase B on the input side, meanwhile, the direct current side of the single-phase uncontrollable rectifier bridge 4 is connected in parallel with a second converter module M15, a third converter module M16 and a fourth converter module M17, one bridge arm of the second converter module M15, the third converter module M16 and the fourth converter module M17 is respectively provided with a third connecting reactor L8, a fourth connecting reactor L9 and a fifth connecting reactor L10, and the third connecting reactor L8, the fourth connecting reactor L9 and the fifth connecting reactor L10 are respectively connected to a first connecting capacitor C11, a second connecting reactor L3 and a fifth connecting reactor L10, The p point of the second coupling capacitor C12 and the third coupling capacitor C13; the other leg of the second, third and fourth converter module M15, M16, M17 is connected to q-point of a first, second and third coupling capacitor C11, C12, C13, respectively; meanwhile, the p points of the first coupling capacitor C11, the second coupling capacitor C12 and the third coupling capacitor C13 are respectively connected to the input side phase a, the phase B and the phase C, and the q points of the first coupling capacitor C11, the second coupling capacitor C12 and the third coupling capacitor C13 are connected to the input end of the three-phase uncontrollable rectifying bridge 14; the output end of the three-phase uncontrollable rectifier bridge 14 is connected in parallel with a large-capacity energy storage capacitor 15, two ends of the large-capacity energy storage capacitor 15 are connected in parallel with a fifth converter module M116, a sixth converter module M117 and a seventh converter module M118, and the alternating current sides of the fifth converter module M116, the sixth converter module M117 and the seventh converter module M118 are respectively provided with a first filter module F19, a second filter module F20 and a third filter module F21; one output end of the first filter module F19, the second filter module F20 and the third filter module F21 is respectively an A-phase output end, a B-phase output end and a C-phase output end of the low-voltage power supply, the other output end of the first filter module F19, the second filter module F20 and the third filter module F21 forms a star point and leads out a ground wire as the low-voltage power supply, and the star point is led out as an N-phase output end of the low-voltage power supply through a shared inductor Lm. Moreover, each of the seven converter modules M1 consists of 4 IGBTs and a storage capacitor, and 4 IGBTs constitute a single-phase fully-controlled H-bridge, and the storage capacitor is connected in parallel to the dc side of the single-phase fully-controlled H-bridge; each of the three output filter modules F consists of a filter inductor, a filter capacitor and a damping resistor, the input end of the filter inductor is used as the input end of the filter module F, and the output end of the filter inductor is connected with the filter capacitor and the damping resistor in series in parallel.
The working principle of the low-voltage power supply special for the railway is as follows: the method comprises the steps of firstly utilizing a full-control rectification PWM voltage stabilization control method to carry out high-power energy gathering, then carrying out voltage lifting semi-closed loop control, specifically adopting a semi-closed loop PWM inversion control algorithm to generate compensation voltage inside, compensating the dropped voltage, coupling the compensated voltage by adopting a capacitor, then carrying out three-phase uncontrollable rectification on the coupled and lifted voltage, and finally outputting the rectified direct current voltage through three-phase split-phase inversion so as to be suitable for unbalanced loads. The method comprises the steps of carrying out full-control rectification on a direct-current side voltage, wherein the full-control rectification PWM voltage stabilization control method is characterized in that the stabilization of the direct-current side voltage is realized in a mode of full-control PWM rectification of an A phase and a C phase and uncontrollable rectification of a B phase; the voltage-boosting semi-closed loop control is specifically applied to 3 converter modules M1 connected in parallel with a single-phase uncontrollable rectifier bridge, assuming that the depth of the voltage on the input side is S V, the corresponding direct-current voltage at the moment is D V, and the duty ratio output by the 3 converter modules M1 is always S/D (for example, assuming that the depth of the voltage on the input side is S V, the corresponding direct-current voltage at the moment is D V, and the duty ratio output by the 3 converter modules M1 is always S/D; S/D is already a PWM signal control method required by the converter module M1, a full closed loop is not needed, a sensor and the like are omitted, only the lowest voltage drop depth S needs to be set, and therefore the voltage-boosting semi-closed loop control is realized); the three-phase split-phase inversion output is a PWM inversion control algorithm, and is particularly applied to 3 converter modules M1 connected with a three-phase uncontrollable rectifier bridge and a high-capacity energy storage capacitor in parallel to output stable three phases of 380V.
Therefore, the railway special low-voltage power supply is applied to railway electric low-voltage power distribution, namely, a single-phase 220V or three-phase 380V power supply with poor electric energy quality can be converted into a stable 380V power supply, on one hand, voltage fluctuation and voltage harmonic waves existing on a traction side are isolated, a perfect sinusoidal power supply is output, on the other hand, single-phase input and three-phase input can be compatible, the railway traction substation, an AT (automatic terminal) station along the line and a subarea station can be installed compatibly, and the overall functionality is enriched; the control method provided by the invention is adopted to realize internal voltage promotion, the number of sensors is not required to be increased, materials are saved, the power supply structure is simpler and more ingenious, meanwhile, a plurality of identical converter modules M1 and the like are adopted, the modular design and installation are realized, the maintenance, the production and the assembly are facilitated, the processing difficulty and the cost are effectively reduced, the popularization, the application and the expansion are facilitated, particularly, the power unit part is universal, the mutual replacement can be realized, and the engineering practice value is stronger.
Of course, the input side of the low-voltage power supply special for the railway adopts A, B, C three-phase input, or adopts A phase to be connected into a live wire, B phase to be connected into a single-phase input of a zero line, and C phase to be suspended, or when high power is required, A and C are connected into the live wire in parallel, and B phase to be connected into the zero line.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. A special low-voltage power supply for railways is characterized in that: the three-phase three-; wherein, the input end of the first converter module M1 (1) is provided with a first connecting reactor L (2) and a second connecting reactor L (3) which are respectively connected to the phase A and the phase C on the input side, the output end of the first converter module M1 (1) is connected in parallel with a single-phase uncontrollable rectifier bridge (4), the alternating current side of the single-phase uncontrollable rectifier bridge (4) is connected to the phase B on the input side, simultaneously, the direct current side of the single-phase uncontrollable rectifier bridge (4) is connected in parallel with a second converter module M1 (5), a third converter module M1 (6) and a fourth converter module M1 (7), one bridge arm of the second converter module M1 (5), the third converter module M1 (6) and the fourth converter module M1 (7) is respectively provided with a third connecting reactor L (8), a fourth connecting reactor L (9) and a fifth connecting reactor (10), and are respectively connected to the p points of a first coupling capacitor C (11), a second coupling capacitor C (12) and a third coupling capacitor C (13) through a third connecting reactor L (8), a fourth connecting reactor L (9) and a fifth connecting reactor (10); the other leg of the second converter module M1 (5), the third converter module M1 (6) and the fourth converter module M1 (7) is connected to the q-point of the first coupling capacitor C (11), the second coupling capacitor C (12) and the third coupling capacitor C (13), respectively; meanwhile, the p points of the first coupling capacitor C (11), the second coupling capacitor C (12) and the third coupling capacitor C (13) are respectively connected to the phase A, the phase B and the phase C of the input side, and the q points of the first coupling capacitor C (11), the second coupling capacitor C (12) and the third coupling capacitor C (13) are connected to the input end of a three-phase uncontrollable rectifying bridge (14); the three-phase uncontrollable rectifier bridge (14) is characterized in that the output end of the three-phase uncontrollable rectifier bridge is connected with a large-capacity energy storage capacitor (15) in parallel, the two ends of the large-capacity energy storage capacitor (15) are connected with a fifth converter module M1 (16), a sixth converter module M1 (17) and a seventh converter module M1 (18) in parallel, and the alternating current sides of the fifth converter module M1 (16), the sixth converter module M1 (17) and the seventh converter module M1 (18) are respectively provided with a first filter module F (19), a second filter module F (20) and a third filter module F (21); one output end of the first filter module F (19), the second filter module F (20) and the third filter module F (21) is an A-phase output end, a B-phase output end and a C-phase output end of the low-voltage power supply respectively, the other output end of the first filter module F (19), the second filter module F (20) and the third filter module F (21) forms a star point and leads out a ground wire serving as the low-voltage power supply, and the star point leads out an N-phase output end serving as the low-voltage power supply through a shared inductor.
2. A railway-specific low-voltage power supply according to claim 1, wherein: each of the seven converter modules M1 consists of 4 IGBTs and a storage capacitor, and 4 IGBTs constitute a single-phase fully-controlled H-bridge, and the storage capacitor is connected in parallel to the dc side of the single-phase fully-controlled H-bridge.
3. The railway-specific low-voltage power supply according to claim 1, wherein: each of the three output filter modules F is composed of a filter inductor, a filter capacitor and a damping resistor, the input end of the filter inductor is used as the input end of the filter module F, and the output end of the filter inductor is connected in parallel with the filter capacitor and the damping resistor which are connected in series.
4. The railway-specific low-voltage power supply according to claim 1, wherein: the input side of the low-voltage power supply special for the railway adopts A, B, C three-phase input, or adopts A phase to be connected into a live wire, B phase to be connected into a single-phase input of a zero line, and C phase to be suspended, or when high power is required, A and C are connected into the live wire in parallel, and B phase to be connected into the zero line.
5. A semi-closed loop control method based on the railway-specific low-voltage power supply according to any one of claims 1 to 4, characterized in that: firstly, carrying out high-power energy input by using a full-control rectification PWM voltage-stabilizing control method, and then carrying out voltage boosting semi-closed loop control; the voltage-boosting semi-closed loop control is applied to 3 converter modules M1 connected with a single-phase uncontrollable rectifier bridge in parallel, the voltage drop depth of an input side is S V, the corresponding direct-current voltage at the moment is D V, the duty ratio output by the 3 converter modules M1 is S/D all the time, specifically, compensation voltage is generated by adopting a semi-closed loop PWM (pulse-width modulation) inversion control algorithm in the converter, the dropped voltage is compensated, the compensated voltage is coupled by adopting a capacitor, then, the voltage after coupling boosting is subjected to three-phase uncontrollable rectification, and finally, the rectified direct-current voltage is output through three-phase split-phase inversion so as to be suitable for unbalanced loads.
6. The method of claim 5, wherein: the full-control rectification PWM voltage stabilization control method specifically comprises the steps that the stabilization of direct-current side voltage is realized in a mode of full-control PWM rectification of an A phase and a C phase and uncontrollable rectification of a B phase; the three-phase split-phase inversion output is a PWM inversion control algorithm, and is particularly applied to 3 converter modules M1 connected with a three-phase uncontrollable rectifier bridge and a high-capacity energy storage capacitor in parallel to output stable three phases of 380V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910624020.9A CN110336473B (en) | 2019-07-11 | 2019-07-11 | Low-voltage power supply special for railway and semi-closed loop control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910624020.9A CN110336473B (en) | 2019-07-11 | 2019-07-11 | Low-voltage power supply special for railway and semi-closed loop control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110336473A CN110336473A (en) | 2019-10-15 |
| CN110336473B true CN110336473B (en) | 2021-05-18 |
Family
ID=68146286
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910624020.9A Active CN110336473B (en) | 2019-07-11 | 2019-07-11 | Low-voltage power supply special for railway and semi-closed loop control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110336473B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200964066Y (en) * | 2006-11-02 | 2007-10-24 | 青岛经济技术开发区创统科技发展有限公司 | Power supply for electrified railroad station |
| CN106533198A (en) * | 2016-12-28 | 2017-03-22 | 苑雪飞 | High-frequency transformer-based railway purification power supply device |
| CN107276106A (en) * | 2017-06-05 | 2017-10-20 | 普世通（北京）电气有限公司 | A kind of low pressure phase selection balance system and its method of work |
| CN109167509A (en) * | 2018-09-27 | 2019-01-08 | 珠海万力达电气自动化有限公司 | Take into account the railway run-through line power supply of traction voltage compensation with railway power power supply |
| CN109194178A (en) * | 2018-09-27 | 2019-01-11 | 珠海万力达电气自动化有限公司 | A kind of high voltage power supply suitable for large capacity energy regenerating and railway power power supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018195089A1 (en) * | 2017-04-17 | 2018-10-25 | Philip Teague | Methods for precise output voltage stability and temperature compensation of high voltage x-ray generators within the high-temperature environments of a borehole |
-
2019
- 2019-07-11 CN CN201910624020.9A patent/CN110336473B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN200964066Y (en) * | 2006-11-02 | 2007-10-24 | 青岛经济技术开发区创统科技发展有限公司 | Power supply for electrified railroad station |
| CN106533198A (en) * | 2016-12-28 | 2017-03-22 | 苑雪飞 | High-frequency transformer-based railway purification power supply device |
| CN107276106A (en) * | 2017-06-05 | 2017-10-20 | 普世通（北京）电气有限公司 | A kind of low pressure phase selection balance system and its method of work |
| CN109167509A (en) * | 2018-09-27 | 2019-01-08 | 珠海万力达电气自动化有限公司 | Take into account the railway run-through line power supply of traction voltage compensation with railway power power supply |
| CN109194178A (en) * | 2018-09-27 | 2019-01-11 | 珠海万力达电气自动化有限公司 | A kind of high voltage power supply suitable for large capacity energy regenerating and railway power power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110336473A (en) | 2019-10-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101316074B (en) | Back-to-back three-power level midpoint clamping current transformer of wind power generation system | |
| CN204103797U (en) | The T-shaped inverter of a kind of accurate Z source three level | |
| CN101534063B (en) | Cascade connection polyphase converter | |
| CN103490419B (en) | Flexible alternating-current direct-current hybrid power supply system of power distribution network | |
| CN107370392B (en) | Electric power electric transformer towards mesohigh intelligent distribution network | |
| CN105978376A (en) | Grid-connected inverter circuit and control method thereof | |
| CN105226957A (en) | A kind of three-phase-single-phase potential device of no industrial frequency transformer | |
| CN103701309A (en) | Alternating-direct current power supply system for variable frequency equipment and variable frequency air conditioner | |
| CN111431394A (en) | Novel step-down single-phase three-level bridgeless PFC converter system | |
| US20180145585A1 (en) | Hybrid transformation system based on three-phase pwm rectifier and multi-unit uncontrolled rectifier and control method thereof | |
| CN205051584U (en) | Three -phase - single -phase potential device of no frequency transformer | |
| CN201332271Y (en) | Electrified railway power compensator | |
| CN209134309U (en) | A kind of three-phase alternating current-direct current buck translation circuit | |
| CN216564947U (en) | Power supply device for converting single phase into three phases | |
| CN105305853A (en) | Multi-pulse wave rectifier using active power factor correction technology and design method thereof | |
| CN105450076A (en) | Z-source three-level inverter and air conditioning system | |
| CN115995804B (en) | Urban rail transit flexible direct current distribution system | |
| CN110336473B (en) | Low-voltage power supply special for railway and semi-closed loop control method | |
| CN107994770A (en) | Single-stage current type converter with series multistage switch L.C. network | |
| CN111628665B (en) | Medium-high voltage power electronic transformer based on series digital voltage stabilizer | |
| CN210821908U (en) | High-speed railway load characteristic adjusting device based on modularization multi-level | |
| CN107134938B (en) | Single-phase three-level half-bridge inverter capable of realizing capacitor voltage equalizing | |
| CN105553275A (en) | Six-phase inverter type high power DC boost converter and control method thereof | |
| CN103219903B (en) | The many buses of a kind of direct-current grid export rectifying conversion apparatus and control method | |
| CN219124107U (en) | Purification power supply capable of converting single phase into three-phase balance |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |