CN110588449B - Traction substation power supply structure and control method thereof - Google Patents
Traction substation power supply structure and control method thereof Download PDFInfo
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- CN110588449B CN110588449B CN201911000797.4A CN201911000797A CN110588449B CN 110588449 B CN110588449 B CN 110588449B CN 201911000797 A CN201911000797 A CN 201911000797A CN 110588449 B CN110588449 B CN 110588449B
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
Abstract
The invention discloses a power supply structure of a traction substation and a control method thereof, and belongs to the technical field of electrified railway power supply. The primary side of the three-phase/two-phase transformer is connected with a three-phase power supply, the secondary side of the three-phase/two-phase transformer is connected with two traction buses through two feed-in lines respectively, the current transformer is connected in series with working feeder lines, two alternating-current sides of the single-phase alternating-current/direct-current transformer are connected with a corresponding group of working feeder lines on the two working buses respectively, the alternating-current side of the alternating-current/direct-current transformer of the energy storage device is connected with a group of working feeder lines on the working bus, the direct-current side of the alternating-current/direct-current transformer is connected with energy storage equipment of the energy storage device, the signal end of the integrated controller is connected with the secondary side of the current transformer, and the two-way signal end of the integrated controller is connected with control ports of the alternating-current/direct-current transformer and the energy storage equipment respectively. A control method is also disclosed. The method is beneficial to the economical, energy-saving and efficient operation of the traction substation of the electrified railway, and can realize the power dispatching between two power supply arms and compensate the negative sequence of the system.
Description
Technical Field
The invention relates to the technical field of electrified railway power supply.
Background
The traction load of the electrified railway fluctuates severely, and the peak value and the valley value of the power are greatly different. In order to meet the peak power requirement of the electric locomotive, the traction transformer is often large in installation capacity, so that the traction transformer is low in load rate, the capacity utilization rate of traction power supply equipment is low, and meanwhile, the electric energy production cost of an electric power system is increased. In addition, the power peaks also degrade the system power quality on another procedure. With the continuous increase of the traffic of high-speed railways, the capacity of the infrastructure of the traction power supply system is not kept up, and equipment expansion and updating are required. In addition, when the electric locomotive is in a regenerative braking operation condition, power is returned to the electric system, however, the electric network often limits the injection amount of the regenerative braking power on a certain program, which also presents new challenges for the traction power supply system. The energy storage device can be used as a buffer area of traction load, discharges at the peak of the load, charges at the valley of the load, and has the effect of relieving the fluctuation of the traction load, so that the pressure of peak power on a system and equipment is relieved, and the regenerative braking energy can be effectively absorbed.
The traction load on the two power supply arms of the traction substation is unevenly distributed, negative sequence current can be generated, and three-phase voltage unbalance of the power system is caused. The patent 'an electrified railway energy storage in-phase power supply device and a control method thereof' (application publication number: CN 107104444A) and 'an electrified railway in-phase energy storage power supply structure and a control method thereof' (application number: 101910332002.3) respectively provide a solution for peak clipping and valley filling of an in-phase energy storage power supply system, compensate for three-phase voltage unbalance of a power system, but are only aimed at the in-phase power supply system and are not suitable for an out-of-phase power supply traction substation.
In summary, how to comprehensively solve the problems of peak clipping, valley filling, regenerative braking absorption and voltage unbalance compensation of the out-of-phase power supply traction substation by using the energy storage technology is an urgent need to be studied at present.
Disclosure of Invention
The invention aims to provide a power supply structure of a traction substation and a control method thereof, which can effectively solve the technical problems of economical, energy-saving and efficient operation of the traction substation of an electrified railway, realization of power scheduling among out-of-phase power supply arms and negative sequence control.
In order to realize the technical problems to be solved, the invention adopts the following technical scheme:
a power supply structure of a traction substation comprises a three-phase/two-phase transformer TT, a feed-in line and a traction bus, wherein the traction substation is used for providing electric energy for a power supply arm of an electrified railway, and the feed-in line is divided into a first feed-in line L 1 And a second feed-in line L 2 The traction bus is divided into a first traction bus TB 1 And a second traction bus TB 2 The method comprises the steps of carrying out a first treatment on the surface of the The primary side of the three-phase/two-phase transformer TT is connected with a three-phase power supply of a power grid A, B, C, and the phase a in the two phases of the secondary side is connected with the primary side of the three-phase/two-phase transformer TT through a first feed-in line L 1 With first traction busbar TB 1 Phase b of the secondary two phases is connected through a second feed-in line L 2 With a second traction busbar TB 2 Are connected; from the first traction bus TB 1 And a second traction bus TB 2 The working feeder lines are led out to be five paths, wherein the first traction bus TB 1 Three paths are led out and respectively marked as a first working feeder line F 11 Second working feeder F 12 And a third working feeder F 13 The method comprises the steps of carrying out a first treatment on the surface of the Second traction bus TB 2 The two paths led out are respectively marked as a fourth working feeder F 21 And a fifth working feeder F 22 The method comprises the steps of carrying out a first treatment on the surface of the The working feeder line is provided with a current transformer, wherein a first working feeder line F 11 Is provided with a first current transformer CT 11 Second working feeder F 12 Is provided with a second current transformer CT 12 Third working feeder F 13 CT with third current transformer 13 Fourth working feeder F 21 CT with fourth current transformer 21 Fifth working feeder F 22 CT with fifth current transformer 22 The method comprises the steps of carrying out a first treatment on the surface of the First working feeder F 11 Fourth working feeder F 21 Supplying power to the electric locomotives of the power supply arms respectively; two alternating current sides of the single-phase alternating current-direct current-alternating current converter ADA are respectively connected with a third working feeder line F 13 Fifth working feeder F 22 Connecting; the energy storage device comprises an alternating current-direct current converter AD and energy storage equipment SD, wherein an alternating current side of the alternating current-direct current converter AD and a second working feeder line F 12 The direct current side of the alternating current-direct current converter AD is connected with the direct current side of the energy storage device SD; signal end P of integrated controller CCD 1 ～P 5 Respectively with the first current transformer CT 11 CT of the second current transformer 12 CT of third current transformer 13 CT of fourth current transformer 21 And a fifth current transformer CT 22 The output end is connected with the two-way signal end P of the integrated controller CCD 6 ～P 8 And the control ends of the single-phase AC-DC converter ADA are respectively connected with the control ends of the AC-DC converter AD, the energy storage equipment SD and the single-phase AC-DC converter ADA.
In order to realize the technical problems to be solved, the invention adopts the following technical scheme:
control method for power supply structure of traction substation and recording first current transformer CT 11 The current of (2) is I 11 Second current transformer CT 12 The current of (2) is I 12 Third current transformer CT 13 The current of (2) is I 13 CT of fourth current transformer 21 The current of (2) is I 21 Fifth current transformer CT 22 The current of (2) is I 22 Traction load power factor is 1, traction load threshold current is I ref When the three-phase/two-phase transformer TT is a balanced wiring,
(1) If I 11 +I 21 ≥I ref ，
The integrated controller CCD controls the AC-DC converter AD and the energy storage device SD to the first traction bus TB 1 Discharge, discharge current is denoted as I dis Wherein I dis Greater than or equal to I 11 +I 21 -I ref ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second step ofFeed-in line L 2 I.e. active scheduling: i 22 ＝(I 11 -I 21 -I dis )/2，I 13 ＝-I 22 Wherein I 22 More than or equal to 0 indicates that the power is represented by a second feed-in line L 2 Dispatch to the first feed-in line L 1 ，I 22 <0 indicates that the power is supplied from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22 ＝I ref /2-I 21 ，I 13 ＝-I 22 The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatch is 0;
(2) If I 11 +I 21 <I ref ，
The integrated controller CCD controls the AC-DC converter AD to be controlled by the first traction bus TB 1 Charging the energy storage device SD, and recording the charging current as I ch Wherein I ch Less than or equal to I ref -I 11 -I 21 ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22 ＝(I 11 -I 21 +I ch )/2，I 13 ＝-I 22 Wherein I 22 More than or equal to 0 indicates that the power is represented by a second feed-in line L 2 Dispatch to the first feed-in line L 1 ，I 22 <0 indicates that the power is supplied from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I ref -I 11 -I 21 When I 22 ＝I ref /2-I 21 ，I 13 ＝-I 22 The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatch is 0;
preferably, a control method of the power supply configuration of the traction substation, when the three-phase/two-phase transformer TT is 120 deg. wired,
(1) If I 11 +I 21 ≥I ref ，
The integrated controller CCD controls the AC-DC converter AD and the energy storage device SD to the first traction bus TB 1 Discharge, discharge current is denoted as I dis Wherein I dis Greater than or equal to I 11 +I 21 -I ref ；
Recording current I 22 Is I 22p Reactive current component I 22q The method comprises the steps of carrying out a first treatment on the surface of the Current I 13 Is I 13p Reactive current component I 13q . The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22p ＝(I 11 -I 21 -I dis )/2，I 13p ＝-I 22p Wherein I 22p More than or equal to 0 indicates that active power is fed into the line L from the second 2 Dispatch to the first feed-in line L 1 ，I 22p <0 indicates that active power is fed from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22p ＝I ref /2-I 21 ，I 13p ＝-I 22p The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatching:
if the first traction bus TB 1 Voltage leading the second traction bus TB 2 Voltage 60 deg., then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 60 deg., then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage leading the second traction bus TB 2 Voltage 120 DEG, then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 120 DEG, then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °;
(2) If I 11 +I 21 <I ref ，
The integrated controller CCD controls the AC-DC converter AD to be controlled by the first traction bus TB 1 Charging the energy storage device SD, and recording the charging current as I ch Wherein I ch Less than or equal to I ref -I 11 -I 21 ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22p ＝(I 11 -I 21 +I ch )/2，I 13p ＝-I 22p Wherein I 22p More than or equal to 0 indicates that active power is fed into the line L from the second 2 Dispatch to the first feed-in line L 1 ，I 22p <0 indicates that active power is fed from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22p ＝I ref /2-I 21 ，I 13p ＝-I 22p The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatching:
if the first traction bus TB 1 Voltage leading the second traction bus TB 2 Voltage 60 deg., then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 60 deg., then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage leading the second traction bus TB 2 Voltage 120 DEG, then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 120 DEG, then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 deg..
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the energy storage device is arranged on one power supply arm of the traction substation, so that the out-of-phase power supply energy storage economic operation is realized.
2. The invention comprehensively realizes the peak clipping and valley filling, regenerative braking energy absorption and negative sequence control functions of the traction power transformation station.
3. The control method is simple and easy to implement.
Drawings
FIG. 1 is a schematic diagram of a circuit configuration of the present invention.
FIG. 2 is a second schematic diagram of the circuit structure of the present invention.
FIG. 3 is a flow chart of a control method of the present invention.
FIG. 4 is a second flowchart of the control method of the present invention.
Detailed Description
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 a traction substation power supply configuration, where the traction power supply configuration includes: the traction substation is used for providing three-phase/two-phase transformers TT, feed-in wires and traction buses for electrified railway power supply arms, single-phase alternating-current-direct-current-alternating-current converters ADA for power dispatching of the power supply arms, energy storage devices for peak clipping and valley filling of traction loads and an energy storage comprehensive compensation controller CCD.
The feed-in line is divided into a first feed-in line L 1 And a second feed-in line L 2 The traction bus is divided into a first traction bus TB 1 And a second traction bus TB 2 The method comprises the steps of carrying out a first treatment on the surface of the The primary side of the three-phase/two-phase transformer TT is connected with a three-phase power supply of a power grid A, B, C, and the phase a in the two phases of the secondary side is connected with the primary side of the three-phase/two-phase transformer TT through a first feed-in line L 1 With first traction busbar TB 1 Phase b of the secondary two phases is connected through a second feed-in line L 2 With a second traction busbar TB 2 Are connected; from the first traction bus TB 1 And a second traction bus TB 2 The working feeder lines are led out to be five paths, wherein the first traction bus TB 1 Three paths are led out and respectively marked as a first working feeder line F 11 Second working feeder F 12 And a third working feeder F 13 The method comprises the steps of carrying out a first treatment on the surface of the Second traction busTB 2 The two paths led out are respectively marked as a fourth working feeder F 21 And a fifth working feeder F 22 The method comprises the steps of carrying out a first treatment on the surface of the The working feeder line is provided with a current transformer, wherein a first working feeder line F 11 Is provided with a first current transformer CT 11 Second working feeder F 12 Is provided with a second current transformer CT 12 Third working feeder F 13 CT with third current transformer 13 Fourth working feeder F 21 CT with fourth current transformer 21 Fifth working feeder F 22 CT with fifth current transformer 22 The method comprises the steps of carrying out a first treatment on the surface of the First working feeder F 11 Fourth working feeder F 21 Supplying power to the electric locomotives of the power supply arms respectively;
two alternating current sides of the single-phase alternating current-to-direct current-to-alternating current converter ADA are respectively connected with a third working feeder line F 13 Fifth working feeder F 22 Connecting;
the energy storage device comprises an alternating current-direct current converter AD and energy storage equipment SD, wherein the alternating current side of the alternating current-direct current converter AD and a second working feeder line F 12 The direct current side of the alternating current-direct current converter AD is connected with the direct current side of the energy storage device SD;
the signal end P of the integrated controller CCD 1 ～P 5 Respectively with the first current transformer CT 11 CT of the second current transformer 12 CT of third current transformer 13 CT of fourth current transformer 21 And a fifth current transformer CT 22 The output end is connected with the two-way signal end P of the integrated controller CCD 6 ～P 8 And the control ends of the single-phase AC-DC converter ADA are respectively connected with the control ends of the AC-DC converter AD, the energy storage equipment SD and the single-phase AC-DC converter ADA.
Preferably, said second working feed line F 12 Can also be connected to the second traction bus TB 2 The energy storage device is connected to the second traction bus TB 2 ；
Example two
As shown in fig. 2, the power substation power supply structure includes: the traction substation is used for providing three-phase/two-phase transformers TT, three-phase/two-phase standby transformers TTB, circuit breakers, standby circuit breakers, feed-in lines, standby feed-in lines and traction buses for the single-phase AC-DC-AC converter ADA for power dispatching of the power supply arm, an energy storage device for peak clipping and valley filling of traction load and an energy storage comprehensive compensation controller CCD.
The feed-in line is divided into a first feed-in line L 1 And a second feed-in line L 2 The standby feed-in line is divided into a first standby feed-in line L 1b And a second standby feed-in line L 2b The traction bus is divided into a first traction bus TB 1 And a second traction bus TB 2 The circuit breaker is divided into a first circuit breaker QF a And a second circuit breaker QF b The standby breaker is divided into a first standby breaker QF ab And a second standby breaker QF bb The method comprises the steps of carrying out a first treatment on the surface of the The primary side of the three-phase/two-phase transformer TT is connected with a A, B, C three-phase power supply, and the phase a in the two phases of the secondary side is connected with a first breaker QF a And a first feed-in line L 1 Connected with the first feed-in line L 1 And also with the first traction bus TB 1 Phase b of the secondary two phases is connected through a second breaker QF b And a second feed-in line L 2 Connected with the second feed-in line L 2 And also with a second traction bus TB 2 Are connected; the TTB primary side of the three-phase/two-phase standby transformer is connected with A 1 、B 1 、C 1 Three-phase power supply, a phase communication between two phases of secondary side and first standby breaker QF ab And a first standby feed-in line L 1b Connected with a first standby feed-in line L 1b And also with the first traction bus TB 1 Phase b of the secondary two phases is connected with the secondary two phases through a second standby breaker QF bb And a second standby feed-in line L 2b Connected with a second standby feed-in line L 2b And also with a second traction bus TB 2 Are connected; from the first traction bus TB 1 And a second traction bus TB 2 The working feeder lines are led out to be five paths, wherein the first traction bus TB 1 Three paths are led out and respectively marked as a first working feeder line F 11 Second working feeder F 12 And a third working feeder F 13 The method comprises the steps of carrying out a first treatment on the surface of the Second traction bus TB 2 The two paths led out are respectively marked as a fourth working feeder F 21 And a fifth working feeder F 22 The method comprises the steps of carrying out a first treatment on the surface of the The working feeder line is provided with a current transformer,wherein the first working feeder F 11 Is provided with a first current transformer CT 11 Second working feeder F 12 Is provided with a second current transformer CT 12 Third working feeder F 13 CT with third current transformer 13 Fourth working feeder F 21 CT with fourth current transformer 21 Fifth working feeder F 22 CT with fifth current transformer 22 The method comprises the steps of carrying out a first treatment on the surface of the First working feeder F 11 Fourth working feeder F 21 Supplying power to the electric locomotives of the power supply arms respectively;
two alternating current sides of the single-phase alternating current-to-direct current-to-alternating current converter ADA are respectively connected with a third working feeder line F 13 Fifth working feeder F 22 Connecting;
the energy storage device comprises an alternating current-direct current converter AD and energy storage equipment SD, wherein the alternating current side of the alternating current-direct current converter AD and a second working feeder line F 12 The direct current side of the alternating current-direct current converter AD is connected with the direct current side of the energy storage device SD;
the signal end P of the integrated controller CCD 1 ～P 5 Respectively with the first current transformer CT 11 CT of the second current transformer 12 CT of third current transformer 13 CT of fourth current transformer 21 And a fifth current transformer CT 22 The output end is connected with the two-way signal end P of the integrated controller CCD 6 ～P 8 And the control ends of the single-phase AC-DC converter ADA are respectively connected with the control ends of the AC-DC converter AD, the energy storage equipment SD and the single-phase AC-DC converter ADA.
In the traction power supply structure, the three-phase/two-phase transformer TT, the circuit breaker, the feed-in line and the traction bus form a path of electric energy channel; the three-phase/two-phase standby transformer TTB, the standby breaker, the standby feed-in line and the traction bus form another standby electric energy channel. The two paths of electric energy channels are respectively used for providing electric energy for the electrified railway power supply arm.
Example III
As shown in fig. 3, an embodiment of the present invention provides a control method for a power supply structure of a traction substation, when a three-phase/two-phase transformer TT is a balanced wiring,
(1) If I 11 +I 21 ≥I ref ，
The integrated controller CCD controls the direct current converter AD and the energy storage device SD to the first traction bus TB 1 Discharge, discharge current is denoted as I dis Wherein I dis Greater than or equal to I 11 +I 21 -I ref ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22 ＝(I 11 -I 21 -I dis )/2，I 13 ＝-I 22 Wherein I 22 More than or equal to 0 indicates that the power is represented by a second feed-in line L 2 Dispatch to the first feed-in line L 1 ，I 22 <0 indicates that the power is supplied from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22 ＝I ref /2-I 21 ，I 13 ＝-I 22 The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatch is 0;
(2) If I 11 +I 21 <I ref ，
The integrated controller CCD controls the AC-DC converter AD to be controlled by the first traction bus TB 1 Charging the energy storage device SD, and recording the charging current as I ch Wherein I ch Less than or equal to I ref -I 11 -I 21 ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22 ＝(I 11 -I 21 +I ch )/2，I 13 ＝-I 22 Wherein I 22 More than or equal to 0 indicates that the power is represented by a second feed-in line L 2 Dispatch to the first feed-in line L 1 ，I 22 <0 indicates that the power is supplied from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I ref -I 11 -I 21 When I 22 ＝I ref /2-I 21 ，I 13 ＝-I 22 The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatch is 0.
The three-phase/two-phase transformer TT of the embodiment adopts balanced wiring, comprises Scott, YNCD, an impedance matching balance transformer and the like, and the single-phase AC-DC-AC converter ADA only needs to carry out active power dispatching and does not need reactive power dispatching. And negative sequence full compensation is realized, and peak clipping and valley filling of traction load are realized.
Example IV
As shown in fig. 4, an embodiment of the present invention provides a control method of a power supply structure of a traction substation, when a three-phase/two-phase transformer TT is 120 deg. wired,
(1) If I 11 +I 21 ≥I ref ，
The integrated controller CCD controls the direct current converter AD and the energy storage device SD to the first traction bus TB 1 Discharge, discharge current is denoted as I dis Wherein I dis Greater than or equal to I 11 +I 21 -I ref ；
Recording current I 22 Is I 22p Reactive current component I 22q The method comprises the steps of carrying out a first treatment on the surface of the Current I 13 Is I 13p Reactive current component I 13q . The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22p ＝(I 11 -I 21 -I dis )/2，I 13p ＝-I 22p Wherein I 22p More than or equal to 0 indicates that active power is fed into the line L from the second 2 Dispatch to the first feed-in line L 1 ，I 22p <0 indicates that active power is fed from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22p ＝I ref /2-I 21 ，I 13p ＝-I 22p The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatching:
if the first traction bus TB 1 Voltage is ahead of the firstTwo traction bus TB 2 Voltage 60 deg., then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 60 deg., then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage leading the second traction bus TB 2 Voltage 120 DEG, then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 120 DEG, then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °;
(2) If I 11 +I 21 <I ref ，
The integrated controller CCD controls the AC-DC converter AD to be controlled by the first traction bus TB 1 Charging the energy storage device SD, and recording the charging current as I ch Wherein I ch Less than or equal to I ref -I 11 -I 21 ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22p ＝(I 11 -I 21 +I ch )/2，I 13p ＝-I 22p Wherein I 22p More than or equal to 0 indicates that active power is fed into the line L from the second 2 Dispatch to the first feed-in line L 1 ，I 22p <0 indicates that active power is fed from the first feed-in line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22p ＝I ref /2-I 21 ，I 13p ＝-I 22p The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatching:
if the first traction bus TB 1 Voltage leading the second traction bus TB 2 Voltage 60 deg., then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 60 deg., then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage leading the second traction bus TB 2 Voltage 120 DEG, then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °, if the first traction busbar TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 120 DEG, then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 deg..
The three-phase/two-phase transformer TT of the embodiment of the invention adopts 120-degree wiring, comprising Vv, YNd11 and the like, and the single-phase AC-DC-AC converter ADA is required to carry out active power dispatching and reactive power dispatching. And negative sequence full compensation is realized, and peak clipping and valley filling of traction load are realized.
Therefore, the embodiment of the invention is beneficial to alleviating traction load fluctuation and realizing power scheduling between the two power supply arms, thereby achieving economic, energy-saving and efficient operation of the traction substation, meeting national standard requirements in negative sequence and effectively utilizing train regenerative braking energy.
Claims (3)
1. A power supply structure of a traction substation comprises a three-phase/two-phase transformer TT, a feed-in line and a traction bus, wherein the traction substation is used for providing electric energy for a power supply arm of an electrified railway, and the feed-in line is divided into a first feed-in line L 1 And a second feed-in line L 2 The traction bus is divided into a first traction bus TB 1 And a second traction bus TB 2 The method comprises the steps of carrying out a first treatment on the surface of the The primary side of the three-phase/two-phase transformer TT is connected with a three-phase power supply of a power grid A, B, C, and the phase a in the two phases of the secondary side is connected with the primary side of the three-phase/two-phase transformer TT through a first feed-in line L 1 With first traction busbar TB 1 Phase b of the secondary two phases is connected through a second feed-in line L 2 With a second traction busbar TB 2 Are connected; the method is characterized in that: from the first traction bus TB 1 And a second traction bus TB 2 The working feeder lines are led out to be five paths, wherein the first traction bus TB 1 Three paths are led out and respectively marked as a first working feeder line F 11 Second working feeder F 12 And a third working feeder F 13 The method comprises the steps of carrying out a first treatment on the surface of the Second traction bus TB 2 The two paths led out are respectively marked as a fourth working feeder F 21 And a fifth working feeder F 22 The method comprises the steps of carrying out a first treatment on the surface of the The working feeder line is provided with a current transformer, wherein a first working feeder line F 11 Is provided with a first current transformer CT 11 Second working feeder F 12 Is provided with a second current transformer CT 12 Third working feeder F 13 CT with third current transformer 13 Fourth working feeder F 21 CT with fourth current transformer 21 Fifth working feeder F 22 CT with fifth current transformer 22 The method comprises the steps of carrying out a first treatment on the surface of the First working feeder F 11 Fourth working feeder F 21 Supplying power to the electric locomotives positioned on the respective power supply arms respectively; two alternating current sides of the single-phase alternating current-direct current-alternating current converter ADA are respectively connected with a third working feeder line F 13 Fifth working feeder F 22 Connecting; the energy storage device comprises an alternating current-direct current converter AD and energy storage equipment SD, wherein an alternating current side of the alternating current-direct current converter AD and a second working feeder line F 12 The direct current side of the alternating current-direct current converter AD is connected with the direct current side of the energy storage device SD; signal end P of integrated controller CCD 1 ～P 5 Respectively with the first current transformer CT 11 CT of the second current transformer 12 CT of third current transformer 13 CT of fourth current transformer 21 And a fifth current transformer CT 22 The output end is connected with the two-way signal end P of the integrated controller CCD 6 ～P 8 And the control ends of the single-phase AC-DC converter ADA are respectively connected with the control ends of the AC-DC converter AD, the energy storage equipment SD and the single-phase AC-DC converter ADA.
2. Control method for power supply structure of traction substation and recording first current transformer CT 11 The current of (2) is I 11 Second current transformer CT 12 The current of (2) is I 12 Third current transformer CT 13 The current of (2) is I 13 CT of fourth current transformer 21 The current of (2) is I 21 Fifth current transformer CT 22 The current of (2) is I 22 Traction load power factor is 1, traction transformerThe threshold current is I ref The method is characterized in that: when the three-phase/two-phase transformer TT is a balanced wiring,
(1) If I 11 +I 21 ≥I ref ，
The integrated controller CCD controls the AC-DC converter AD and the energy storage device SD to the first traction bus TB 1 Discharge, discharge current is denoted as I dis Wherein I dis Greater than or equal to I 11 +I 21 -I ref ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22 ＝(I 11 -I 21 -I dis )/2，I 13 ＝-I 22 Wherein I 22 More than or equal to 0 indicates that the power is represented by a second feed-in line L 2 Dispatch to the first feed-in line L 1 ，I 22 < 0 indicates that the power is supplied by the first feed line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22 ＝I ref /2-I 21 ，I 13 ＝-I 22 The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatch is 0;
(2) If I 11 +I 21 ＜I ref ，
The integrated controller CCD controls the AC-DC converter AD to be controlled by the first traction bus TB 1 Charging the energy storage device SD, and recording the charging current as I ch Wherein I ch Less than or equal to I ref -I 11 -I 21 ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22 ＝(I 11 -I 21 +I ch )/2，I 13 ＝-I 22 Wherein I 22 More than or equal to 0 indicates that the power is represented by a second feed-in line L 2 Dispatch to the first feed-in line L 1 ，I 22 < 0 indicates that the power is supplied by the first feed line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I ref -I 11 -I 21 When I 22 ＝I ref /2-I 21 ，I 13 ＝-I 22 The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatch is 0.
3. A control method for a power supply structure of a traction substation is characterized by comprising the following steps: when the three-phase/two-phase transformer TT is 120 deg. wired,
(1) If I 11 +I 21 ≥I ref ，
The integrated controller CCD controls the AC-DC converter AD and the energy storage device SD to the first traction bus TB 1 Discharge, discharge current is denoted as I dis Wherein I dis Greater than or equal to I 11 +I 21 -I ref ；
Recording current I 22 Is I 22p Reactive current component I 22q The method comprises the steps of carrying out a first treatment on the surface of the Current I 13 Is I 13p Reactive current component I 13q The method comprises the steps of carrying out a first treatment on the surface of the The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22p ＝(I 11 -I 21 -I dis )/2，I 13p ＝-I 22p Wherein I 22p More than or equal to 0 indicates that active power is fed into the line L from the second 2 Dispatch to the first feed-in line L 1 ，I 22p < 0 indicates that active power is fed from the first feed line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22p ＝I ref /2-I 21 ，I 13p ＝-I 22p The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatching:
if the first traction bus TB 1 Voltage leading the second traction bus TB 2 Voltage 60 deg., then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °; if the first traction bus TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 60 deg., then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °; if the first traction bus TB 1 Voltage leading the second traction bus TB 2 Voltage 120 DEG, then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °; if the first traction bus TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 120 DEG, then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °;
(2) If I 11 +I 21 ＜I ref ，
The integrated controller CCD controls the AC-DC converter AD to be controlled by the first traction bus TB 1 Charging the energy storage device SD, and recording the charging current as I ch Wherein I ch Less than or equal to I ref -I 11 -I 21 ；
The integrated controller CCD controls the single-phase AC-DC-AC converter ADA to carry out the first feed-in line L 1 And a second feed-in line L 2 I.e. active scheduling: i 22p ＝(I 11 -I 21 +I ch )/2，I 13p ＝-I 22p Wherein I 22p More than or equal to 0 indicates that active power is fed into the line L from the second 2 Dispatch to the first feed-in line L 1 ，I 22p < 0 indicates that active power is fed from the first feed line L 1 Dispatch to the second feed-in line L 2 The method comprises the steps of carrying out a first treatment on the surface of the When I dis Equal to I 11 +I 21 -I ref When I 22p ＝I ref /2-I 21 ，I 13p ＝-I 22p The method comprises the steps of carrying out a first treatment on the surface of the Reactive power dispatching:
if the first traction bus TB 1 Voltage leading the second traction bus TB 2 Voltage 60 deg., then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 °; if the first traction bus TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 60 deg., then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °; if the first traction bus TB 1 Voltage leading the second traction bus TB 2 Voltage 120 DEG, then I 13q Hysteresis I 13p 90 DEG, I 22q Advanced I 22p 90 °; if the first traction bus TB 1 Voltage hysteresis of second traction bus TB 2 Voltage 120 DEG, then I 13q Advanced I 13p 90 DEG, I 22q Hysteresis I 22p 90 deg..
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