CN108923429B - In-phase power supply substation - Google Patents
In-phase power supply substation Download PDFInfo
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- CN108923429B CN108923429B CN201811061669.6A CN201811061669A CN108923429B CN 108923429 B CN108923429 B CN 108923429B CN 201811061669 A CN201811061669 A CN 201811061669A CN 108923429 B CN108923429 B CN 108923429B
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- 238000005259 measurement Methods 0.000 claims abstract description 15
- 238000004804 winding Methods 0.000 claims description 12
- 230000001939 inductive effect Effects 0.000 claims description 8
- 230000008929 regeneration Effects 0.000 claims description 5
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- 238000000034 method Methods 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000000819 phase cycle Methods 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60M—POWER SUPPLY LINES, AND DEVICES ALONG RAILS, FOR ELECTRICALLY- PROPELLED VEHICLES
- B60M3/00—Feeding power to supply lines in contact with collector on vehicles; Arrangements for consuming regenerative power
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1878—Arrangements for adjusting, eliminating or compensating reactive power in networks using tap changing or phase shifting transformers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Control Of Electrical Variables (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention relates to the field of alternating current electric railway power supply, and particularly discloses an in-phase power supply substation. The in-phase power supply substation comprises a three-phase high-voltage bus, a single-phase main transformer connected with the three-phase high-voltage bus, a traction network connected with the single-phase main transformer and a negative sequence compensation device; the negative sequence compensation device mainly comprises a three-phase compensation transformer, a reactive power compensator and a measurement and control unit; the primary side of the three-phase compensation transformer is connected with ABC three phases of the three-phase high-voltage bus, and the secondary side of the three-phase compensation transformer is connected with the reactive compensator; and the reactive compensator is connected with the measurement and control unit. The invention can effectively cancel the electric split phase at the outlet of the traction substation, realize in-phase power supply and effectively solve the technical problem of real-time compensation of the negative sequence generated by the traction substation.
Description
Technical Field
The invention relates to the technical field of alternating current electric railway power supply.
Background
The electrified railway generally adopts a single-phase power frequency alternating current system powered by a public power system, and adopts a scheme of alternating phase sequence, split phase and partitioned power supply in order to ensure that single-phase traction load is distributed in a three-phase power system as balanced as possible. Adjacent power supply areas at the split-phase areas are isolated by a split-phase insulator to form electric split-phase, which is called split-phase for short. The electric split phase link is the weakest link in the whole traction power supply system, and the train is split excessively to become the bottleneck of traction power supply of a high-speed railway and even the whole electrified railway.
Theory and practice show that the single-phase traction transformer or the combined type in-phase power supply technology adopted in the traction substation can cancel the electric split phase at the outlet of the traction substation, and the bilateral communication technology adopted in the subarea can cancel the electric split phase at the outlet of the traction substation, so that the power supply bottleneck is eliminated, and the railway power supply capacity and the railway transportation capacity are improved. But the core of the method realizes negative sequence compensation by changing the active power flow of the traction substation, so that the negative sequence reaches the standard.
The invention does not change the active power flow of the traction substation, solves the technical problem of negative sequence compensation of the traction substation through reactive power flow control, and ensures that the negative sequence treatment reaches the national standard.
Disclosure of Invention
The invention aims to provide an in-phase power supply substation, which not only can effectively cancel the electric split phase at the outlet of a traction substation to realize in-phase power supply, but also can effectively solve the technical problem of real-time compensation of negative sequence generated by traction substation.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the in-phase power supply substation comprises a three-phase high-voltage bus, a single-phase main transformer connected with the three-phase high-voltage bus and a traction network connected with the single-phase main transformer; wherein: the in-phase power supply substation further comprises a negative sequence compensation device; the negative sequence compensation device consists of a three-phase compensation transformer, a reactive power compensator and a measurement and control unit; the primary side of the three-phase compensation transformer is connected with A, B, C three phases of the three-phase high-voltage bus, and the secondary side of the three-phase compensation transformer is connected with the reactive compensator; and the reactive compensator is connected with the measurement and control unit.
The measurement and control unit is composed of a voltage transformer, a current transformer and a controller; the input end of the controller is respectively connected with the measuring ends of the voltage transformer and the current transformer, and the output end of the controller is connected with the control end of the reactive compensator.
Further preferably, the primary side of the voltage transformer is connected in parallel between the phase A and the phase B in the three-phase high-voltage bus, and the primary side of the current transformer is connected in series with a feeder line of the phase A of the primary side of the single-phase main transformer.
Still further preferably, the reactive compensator is composed of a first reactive compensation unit and a second reactive compensation unit.
Specifically, when the three-phase compensation transformer is an YNd connection group, the first reactive compensation unit is connected with a phase port of a secondary side a of the three-phase compensation transformer, and the second reactive compensation unit is connected with a phase port of a secondary side b of the three-phase compensation transformer.
Specifically, when the three-phase compensation transformer is a DNd connection group, the secondary ca phase port of the three-phase compensation transformer is connected with the first reactive compensation unit, and the secondary bc phase port of the three-phase compensation transformer is connected with the second reactive compensation unit.
Preferably, the primary winding of the single-phase main transformer is connected with the A phase and the B phase in the three-phase high-voltage bus, one end of the secondary winding of the single-phase main transformer is grounded, and the other end of the secondary winding of the single-phase main transformer is led to a traction network for connection.
Further preferably, the negative sequence allowable capacity of the three-phase high-voltage bus is S d The power factor of the traction network load is set to be 1, the controller calculates negative sequence power S corresponding to the load passing through the single-phase main transformer by utilizing the current and the voltage respectively measured by the voltage transformer and the current transformer at the moment t, and the controller controls the first passive compensation unit to absorb inductive reactive power Q under the condition that the load of the single-phase main transformer is in traction working condition 1 The second reactive compensation unit absorbs the same amount of the capacitive reactive power Q 2 The first reactive compensation unit is controlled to absorb the reactive power Q when the load of the single-phase main transformer is in the regeneration working condition 1 The second reactive compensation unit absorbs the same amount of inductive reactive power Q 2 Let Q be 1 And Q is equal to 2 The sum of the negative sequence components generated is S C Q is then 1 、Q 2 The value of (2) is
Still further preferably, when Q 1 、Q 2 When < 0, let Q 1 ＝Q 2 =0, representing that both the first reactive compensation unit and the second reactive compensation unit are inactive.
Compared with the prior art, the invention has the beneficial effects that:
1. the electric split phase at the outlet of the traction substation is canceled, the traction network implements in-phase power supply in a larger range, the utilization of the electric energy of the regenerated train by the traction train is facilitated, the power consumption from the electric power system is reduced, and the energy-saving effect is greatly improved.
2. The required reactive compensator only generates a negative sequence component, does not generate a positive sequence component, namely does not occupy the positive sequence capacity of the power grid, and the three-phase compensation transformer matched with the reactive compensator only transmits negative sequence power, does not transmit positive sequence power, has the technical advantage of no need of paying capacity electric charge, and simultaneously does not change the active power flow of the traction network of the traction transformer.
3. The reactive compensator has reversible working condition, and can still send up-to-standard electric energy to the power grid when the in-phase power supply and transformation system is in an equivalent regeneration working condition.
4. The single-phase main transformer and the three-phase compensation transformer can be installed in a common box, so that occupied land is reduced.
5. Simple structure, excellent performance, advanced technology, reliable method and easy implementation.
Drawings
Fig. 1 is a schematic diagram of the in-phase power supply substation structure according to the present invention.
FIG. 2 is a schematic diagram of the relationship structure between the measurement and control unit and the reactive compensator according to the present invention.
FIG. 3 is a schematic diagram of the input and output relationships of the controller of the present invention.
Fig. 4 is a schematic diagram of a relationship structure between a three-phase compensation transformer and a reactive power compensator according to an embodiment of the invention.
Fig. 5 is a schematic diagram of a relationship structure between a three-phase compensation transformer and a reactive power compensator according to a second embodiment of the present invention.
Detailed Description
For a better understanding of the invention, the working principle of the invention is briefly described here: the power factor of the AC-DC-AC train is very high and can reach 1, and the negative sequence of the three-phase high-voltage bus reaches the standard checking point, so that the negative sequence current or power generated by the traction load can be compensated by installing a negative sequence compensation system, and the national standard requirement is met after the compensation, wherein the negative sequence compensation system generates the negative sequence power flow through a reactive compensator SVG thereof, and the original active power flow is not changed. The invention is further described below with reference to the drawings and detailed description.
Example 1
As shown in fig. 1, an embodiment of the present invention provides an in-phase power supply substation SS, where the in-phase power supply substation includes a three-phase high-voltage bus HB, a single-phase main transformer TT connected to the three-phase high-voltage bus HB, and a traction network OCS connected to the single-phase main transformer TT; wherein: the in-phase power supply substation SS also comprises a negative sequence compensation device NCS; the negative sequence compensation device NCS mainly comprises a three-phase compensation transformer MT, a reactive power compensator SVG and a measurement and control unit MC; the primary side of the three-phase compensation transformer MT is connected with ABC three phases of a three-phase high-voltage bus HB, and the secondary side of the three-phase compensation transformer MT is connected with the reactive compensator SVG; the reactive compensator SVG is connected with the measurement and control unit MC. In the embodiment of the invention, the primary winding of the single-phase main transformer TT is connected with the A phase and the B phase in the three-phase high-voltage bus HB, one end of the secondary winding of the single-phase main transformer TT is grounded, and the other end of the secondary winding of the single-phase main transformer TT is led to the traction network OCS. In the embodiment of the invention, the traction network OCS supplies power to the train LC.
As shown in fig. 2 and 3, the measurement and control unit MC is mainly composed of a voltage transformer PT, a current transformer CT and a controller CD; the input end of the controller CD is respectively connected with the measuring ends of the voltage transformer PT and the current transformer CT, and the output end of the controller CD is connected with the control end of the reactive compensator SVG. In the embodiment of the invention, the primary side of the voltage transformer PT is connected in parallel between the A phase and the B phase in the three-phase high-voltage bus HB, and the primary side of the current transformer CT is connected in series with the primary side A phase feeder line of the single-phase main transformer TT.
As shown in fig. 4, the reactive compensator SVG mainly comprises a first passive compensation unit SVG 1 And a second reactive compensation unit SVG 2 Composition is prepared. In the embodiment of the present invention, the three-phase compensation transformer MT is an YNd coupling group, and the first passive compensation unit SVG 1 The second reactive compensation unit SVG is connected with an alpha-phase port of the MT secondary side of the three-phase compensation transformer 2 And the phase-b port of the secondary side of the three-phase compensation transformer MT is connected.
Due to the inclusion of the first passive compensation unit SVG 1 And a second reactive compensation unit SVG 2 The reactive compensator SVG of (1) only generates a negative sequence component and does not generate a positive sequence component; the three-phase compensation transformer MT only transmits negative sequence power, and does not transmit positive sequence power. In the embodiment of the invention, the negative sequence allowable capacity of the three-phase high-voltage bus HB is set as S d The power factor of the traction network load is set to be 1, the controller CD calculates the negative sequence power S corresponding to the load passing through the single-phase main transformer TT by utilizing the current and the voltage respectively measured by the voltage transformer PT and the current transformer CT at the moment t, and the controller CD controls the first passive compensation unit SVG under the condition that the load of the single-phase main transformer TT is in traction working condition 1 Absorption of inductive reactive power Q 1 Second reactive power compensation unit SVG 2 Absorbing equivalent amount of capacitive reactive power Q 2 While the load of the single-phase main transformer TT is in the regeneration working condition, the first passive compensation unit SVG is controlled 1 Absorbing reactive power Q 1 Second reactive power compensation unit SVG 2 Absorbing an equal amount of inductive reactive power Q 2 Let Q be 1 And Q is equal to 2 The sum of the negative sequence components generated is S C Q is then 1 、Q 2 The value of (2) is When Q is 1 、Q 2 When < 0, let Q 1 ＝Q 2 =0, representing the first passive compensation unit SVG 1 And a second reactive compensation unit SVG 2 And stopping running.
In the embodiment of the present invention, the primary side of the single-phase main transformer TT and the voltage transformer PT may be connected to the B phase and the C phase of the three-phase high-voltage bus HB at the same time, or connected to the C phase and the a phase of the three-phase high-voltage bus HB at the same time, and the secondary side of the three-phase compensation transformer MT and the first passive compensation unit SVG 1 And a second reactive compensation unit SVG 2 The connection is also adjusted accordingly.
Example two
As shown in fig. 1, an embodiment of the present invention provides an in-phase power supply substation SS, where the in-phase power supply substation includes a three-phase high-voltage bus HB, a single-phase main transformer TT connected to the three-phase high-voltage bus HB, and a traction network OCS connected to the single-phase main transformer TT; wherein: the in-phase power supply substation SS also comprises a negative sequence compensation device NCS; the negative sequence compensation device NCS mainly comprises a three-phase compensation transformer MT, a reactive power compensator SVG and a measurement and control unit MC; the primary side of the three-phase compensation transformer MT is connected with ABC three phases of a three-phase high-voltage bus HB, and the secondary side of the three-phase compensation transformer MT is connected with the reactive compensator SVG; the reactive compensator SVG is connected with the measurement and control unit MC. In the embodiment of the invention, the primary winding of the single-phase main transformer TT is connected with the A phase and the B phase in the three-phase high-voltage bus HB, one end of the secondary winding of the single-phase main transformer TT is grounded, and the other end of the secondary winding of the single-phase main transformer TT is led to the traction network OCS. In an embodiment of the present invention, the traction network OCS supplies power to the load (train) LC.
As shown in fig. 2 and 3, the measurement and control unit MC is mainly composed of a voltage transformer PT, a current transformer CT and a controller CD; the input end of the controller CD is respectively connected with the measuring ends of the voltage transformer PT and the current transformer CT, and the output end of the controller CD is connected with the control end of the reactive compensator SVG. In the embodiment of the invention, the primary side of the voltage transformer PT is connected in parallel between the A phase and the B phase in the three-phase high-voltage bus HB, and the primary side of the current transformer CT is connected in series with the primary side A phase feeder line of the single-phase main transformer TT.
As shown in fig. 5, the reactive compensator SVG mainly comprises a first passive compensation unit SVG 1 And a second reactive compensation unit SVG 2 Composition is prepared. In the embodiment of the present invention, the three-phase compensation transformer MT is a DNd connection group, and the secondary ca phase port of the three-phase compensation transformer MT and the first passive compensation unit SVG 1 The terminal of the bc phase of the MT secondary side of the three-phase compensation transformer is connected with the second reactive compensation unit SVG 2 And (5) connection.
Due to the inclusion of the first passive compensation unit SVG 1 And a second step ofReactive power compensation unit SVG 2 The reactive compensator SVG of (1) only generates a negative sequence component and does not generate a positive sequence component; the three-phase compensation transformer MT only transmits negative sequence power, and does not transmit positive sequence power. In the embodiment of the invention, the negative sequence allowable capacity of the three-phase high-voltage bus HB is set as S d The power factor of the traction network load is set to be 1, the controller CD calculates the negative sequence power S corresponding to the load passing through the single-phase main transformer TT by utilizing the current and the voltage respectively measured by the voltage transformer PT and the current transformer CT at the moment t, and the controller CD controls the first passive compensation unit SVG under the condition that the load of the single-phase main transformer TT is in traction working condition 1 Absorption of inductive reactive power Q 1 Second reactive power compensation unit SVG 2 Absorbing equivalent amount of capacitive reactive power Q 2 While the load of the single-phase main transformer TT is in the regeneration working condition, the first passive compensation unit SVG is controlled 1 Absorbing reactive power Q 1 Second reactive power compensation unit SVG 2 Absorbing an equal amount of inductive reactive power Q 2 Let Q be 1 And Q is equal to 2 The sum of the negative sequence components generated is S C Q is then 1 、Q 2 The value of (2) is When Q is 1 、Q 2 When < 0, let Q 1 ＝Q 2 =0, representing the first passive compensation unit SVG 1 And a second reactive compensation unit SVG 2 And stopping running.
In the embodiment of the present invention, the primary side of the single-phase main transformer TT and the voltage transformer PT may be connected to the B phase and the C phase of the three-phase high-voltage bus HB at the same time, or connected to the C phase and the a phase of the three-phase high-voltage bus HB at the same time, and the secondary side of the three-phase compensation transformer MT and the first passive compensation unit SVG 1 And a second reactive compensation unit SVG 2 The connection is also adjusted accordingly.
Claims (7)
1. An in-phase power supply substation comprises three phasesA high-voltage bus (HB), a single-phase main transformer (TT) connected with the three-phase high-voltage bus (HB), and a traction network (OCS) connected with the single-phase main transformer (TT); the method is characterized in that: the in-phase power Supply Substation (SS) further comprises a negative sequence compensation device (NCS); the negative sequence compensation device (NCS) is composed of a three-phase compensation transformer (MT), a reactive power compensator (SVG) and a measurement and control unit (MC); the primary side of the three-phase compensation transformer (MT) is connected with A, B, C three phases of the three-phase high-voltage bus (HB), and the secondary side of the three-phase compensation transformer (MT) is connected with the reactive compensator (SVG); the reactive compensator (SVG) is connected with the measurement and control unit (MC); the reactive compensator (SVG) is formed by a first reactive compensation unit (SVG) 1 ) And a second reactive compensation unit (SVG) 2 ) When the three-phase compensation transformer (MT) is YNd connection group, a first passive compensation unit (SVG) 1 ) A second reactive power compensation unit (SVG) connected with the a-phase port of the secondary side of the three-phase compensation transformer (MT) 2 ) The phase-b port of the secondary side of the three-phase compensation transformer (MT) is connected; when the three-phase compensation transformer (MT) is a DNd connection group, the secondary ca phase port of the three-phase compensation transformer (MT) and a first passive compensation unit (SVG) 1 ) The secondary bc phase port of the three-phase compensation transformer (MT) is connected with a second reactive compensation unit (SVG) 2 ) Connecting; the primary winding of the single-phase main transformer (TT) is connected with A phase and B phase in the three-phase high-voltage bus (HB), one end of the secondary winding of the single-phase main transformer (TT) is grounded, and the other end of the secondary winding of the single-phase main transformer is led to the traction network (OCS) for connection.
2. An in-phase power supply substation according to claim 1, characterized in that: the measurement and control unit (MC) is composed of a voltage transformer (PT), a Current Transformer (CT) and a Controller (CD); the input end of the Controller (CD) is respectively connected with the measuring ends of the voltage transformer (PT) and the Current Transformer (CT), and the output end of the Controller (CD) is connected with the control end of the reactive compensator (SVG).
3. An in-phase power supply substation according to claim 2, characterized in that: the primary side of the voltage transformer (PT) is connected in parallel between the A phase and the B phase in the three-phase high-voltage bus (HB), and the primary side of the Current Transformer (CT) is connected in series with an A phase feeder line of the primary side of the single-phase main transformer (TT).
4. A power substation for in-phase supply according to any one of claims 1-3, characterized in that: reactive compensator (SVG) only produces negative sequence components, not positive sequence components; the three-phase compensation transformer (MT) transmits only negative sequence power, and does not transmit positive sequence power.
5. An in-phase power supply substation according to claim 1, characterized in that: first passive compensation unit (SVG) 1 ) And a second reactive compensation unit (SVG) 2 ) An equal amount of reactive power of opposite polarity is absorbed.
6. An in-phase power supply substation according to claim 1, characterized in that: let the negative sequence allowable capacity of the three-phase high-voltage bus (HB) be S d The method comprises the steps that a traction network load power factor is 1, a Controller (CD) calculates negative sequence power S corresponding to a load passing through a single-phase main transformer (TT) by using currents and voltages respectively measured by a voltage transformer (PT) and a Current Transformer (CT) at t time, and the Controller (CD) controls a first active compensation unit (SVG) under the condition that the load of the single-phase main transformer (TT) is in traction working condition 1 ) Absorption of inductive reactive power Q 1 Second reactive compensation unit (SVG) 2 ) Absorbing equivalent amount of capacitive reactive power Q 2 While the load of the single-phase main transformer (TT) is in the regeneration working condition, the first passive compensation unit (SVG) is controlled 1 ) Absorbing reactive power Q 1 Second reactive compensation unit (SVG) 2 ) Absorbing an equal amount of inductive reactive power Q 2 Let Q be 1 And Q is equal to 2 The sum of the negative sequence components generated is S C Q is then 1 、Q 2 Has a value of Q 1 =Q 2 =S C /=（S-S d ）//>。
7. The in-phase power supply substation of claim 6, wherein: when Q is 1 、Q 2 When < 0, let Q 1 =Q 2 =0, representing the first passive compensation unit (SVG 1 ) And a second reactive compensation unit (SVG) 2 ) And stopping running.
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| CN109088415B (en) * | 2018-09-12 | 2024-06-11 | 西南交通大学 | Negative sequence compensation device and method for in-phase power supply substation |
| CN109600051B (en) * | 2018-12-06 | 2020-06-19 | 中国科学院电工研究所 | Non-full-capacity through type in-phase power supply device and control method thereof |
| CN110208653A (en) * | 2019-06-20 | 2019-09-06 | 西南交通大学 | A kind of electric railway perforation tractive power supply system and its fault section recognition methods |
| CN114771360B (en) * | 2022-04-21 | 2023-04-07 | 西南交通大学 | Alternating current and direct current traction power supply structure and control method for electrified railway |
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