CN109217330B - In-phase power supply and transformation system of electrified railway - Google Patents

In-phase power supply and transformation system of electrified railway Download PDF

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Publication number
CN109217330B
CN109217330B CN201811066548.0A CN201811066548A CN109217330B CN 109217330 B CN109217330 B CN 109217330B CN 201811066548 A CN201811066548 A CN 201811066548A CN 109217330 B CN109217330 B CN 109217330B
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phase
transformer
traction
power supply
traction substation
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CN109217330A (en
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李群湛
李晋
解绍锋
刘刚
郭锴
宫衍圣
陈民武
黄文勋
黄小红
周志录
易东
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Southwest Jiaotong University
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Southwest Jiaotong University
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • 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
    • H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
    • H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
    • 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]
    • 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

Abstract

The invention discloses an in-phase power supply and transformation system of an electrified railway, and relates to the technical field of alternating current electrified railway power supply. The in-phase power supply and transformation system comprises n traction substations, single-phase high-voltage transmission lines and a traction network, wherein the first traction substation comprises a three-phase high-voltage bus, a first main transformer connected with the three-phase high-voltage bus and a negative sequence compensation device connected with the three-phase high-voltage bus; and the second traction substation to the nth traction substation are respectively connected with the single-phase high-voltage transmission line and the traction network. The negative sequence compensation device is arranged in the first traction substation and comprises a three-phase compensation transformer, a three-phase reactive compensation device and a measurement and control unit; the negative sequence compensation device generates negative sequence power flow through the three-phase reactive power compensation device, and does not change the active power flow of the whole system; meanwhile, the advantages of high power transmission and long transmission distance of the high-voltage transmission line are utilized, and the power supply mileage of the electrified railway without split-phase penetration is greatly prolonged.

Description

In-phase power supply and transformation system of electrified railway
Technical Field
The invention relates to the technical field of alternating current electric railway power supply, in particular to a high-voltage long-distance in-phase power supply and transformation technology.
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. The technology that the traction substation adopts a single-phase traction transformer or a combined type in-phase power supply technology to cancel the electric phase splitting at the outlet of the traction substation has been successfully applied, the effect is very good, the bilateral communication of the subarea is similar to the loop closing operation of a power grid, the application of the subarea is limited by the condition of the power grid, for example, the power grid transmission line and the traction grid form a parallel connection relationship, the voltage level is relatively close, the problem that the passing power (balanced current) in the traction grid is relatively large can occur, the implementation of bilateral power supply (loop closing) is influenced due to the lack of related standards, but the passing power is not generated by a power supply structure, namely, the power supply mode of the radiation type structure, namely, the segmented bus bars of the same transformer substation of the power grid respectively supply a plurality of traction substations, in other words, tree power supply is formed on a network graph theory: the substation is a tree root and each traction substation is a leaf. At this time, the single-phase traction transformer or the combined in-phase power supply technology is adopted in the traction substation to cancel the electric split phase at the outlet of the traction substation, and the bilateral communication technology is adopted in the subarea to cancel the electric split phase at the outlet of the traction substation, so that the passing power in the traction network is not caused, and the win-win situation of the power grid and the railway is created.
Here we call the traction substations, which are the same substation of the power grid, to supply power to the traction substations in a radial structure, a traction substation group. The optimized traction substation group for through-type in-phase power supply is configured as follows: the primary sides of the traction substation groups are powered by the sectional buses of the same substation, at most 1 traction substation in the groups is a negative sequence compensation substation, the rest is a single-phase substation, and the voltages of all single-phase traction buses in the groups are the same.
Therefore, the inventor provides a negative sequence centralized compensation control system of a traction substation group and a control method thereof (application number: 2018106212100), and the core of the system is that a negative sequence compensation device ADA of the negative sequence compensation substation adjusts the active power of a non-negative sequence compensation substation in the traction substation group, and the centralized compensation of the negative sequence is realized by changing the active power flow of the traction substation group, so that the negative sequence reaches the standard. The research shows that when the size of the traction substation group is larger, the size of active power flow to be changed is larger, the electric distance is longer, the technical difficulty is larger, and the economic index of network loss is worse and even cannot be realized; meanwhile, the same transformer substation of the power grid supplies power to a plurality of traction substations in a radiation type structure, the length of the radiation type high-voltage transmission line and the limit value of investment can be limited, the number of traction substation groups is limited, and the electrified railway mileage of canceling the electric phase separation at the position by adopting a bilateral communication technology at a subarea is limited.
The invention can greatly prolong the power supply mileage of electrified railways without split phase penetration, does not change the active power flow of the traction substation group, solves the technical problem of centralized negative sequence compensation of the traction substation group through reactive power flow control, and ensures that the negative sequence management reaches the national standard.
Disclosure of Invention
The invention aims to provide an in-phase power supply and transformation system of an electrified railway, which not only can effectively solve the technical problem of short power supply mileage of the electrified railway without split-phase penetration, but also can effectively solve the technical problem of concentrated real-time compensation of negative sequences generated by the in-phase power supply and transformation system.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an in-phase power supply and transformation system of an electrified railway comprises a first traction substation, a second traction substation, … …, an nth traction substation, a single-phase high-voltage transmission line and a traction network connected with the same. The first traction substation comprises a three-phase high-voltage bus, a first main transformer connected with the three-phase high-voltage bus and a negative sequence compensation device connected with the three-phase high-voltage bus; the second traction substation, the … … and the nth traction substation are respectively connected with the single-phase high-voltage transmission line and the traction network, and n is more than or equal to 2.
Preferably, the negative sequence compensation device is installed in the first traction substation and comprises a three-phase compensation transformer, a three-phase reactive compensation device connected with the three-phase compensation transformer and the measurement and control unit connected with the three-phase reactive compensation device.
Further preferably, the measurement and control unit comprises a voltage transformer, a first current transformer, a second current transformer and a controller, wherein the primary side of the voltage transformer is connected between the phase A and the phase B in the three-phase high-voltage bus in parallel, the primary side of the first current transformer is connected in series with a phase A feeder line of the primary side of the main transformer of the first traction substation, and the primary side of the second current transformer is connected in series with a phase A feeder line of the three-phase high-voltage bus to the single-phase high-voltage transmission line.
Preferably, the input end of the controller is connected with the measuring ends of the voltage transformer, the first current transformer and the second current transformer respectively, and the output end of the controller is connected with the control end of the three-phase reactive power compensation device.
Preferably, the first main transformer of the first traction substation, the second main transformers of the second traction substation, … … and the nth main transformer of the nth traction substation all adopt single-phase wiring.
Further preferably, one end of the primary side of the first main transformer is connected with the A phase of the three-phase high-voltage bus in series through a first current transformer, and the other end of the primary side of the first main transformer is connected with the B phase of the three-phase high-voltage bus; one end of the secondary side of the first main transformer is connected with the traction net, and the other end of the secondary side of the first main transformer is grounded.
Further preferably, one end of the primary side of the second main transformer and one end of the primary side of the nth main transformer are respectively connected with an a-phase feeder line of the single-phase high-voltage transmission line, and the other ends of the primary side of the second main transformer and the primary side of the nth main transformer are respectively connected with a B-phase feeder line of the single-phase high-voltage transmission line; and one end of the secondary side of the second main transformer and one end of the secondary side of the nth main transformer are connected with the traction network, and the other ends of the secondary sides of the second main transformer and the nth main transformer are grounded.
Preferably, the primary side of the three-phase compensation transformer of the negative sequence compensation device is connected with the phase A, the phase B and the phase C of the three-phase high-voltage bus, and the secondary side of the three-phase compensation transformer is connected with the three-phase reactive compensation device.
Compared with the prior art, the invention has the beneficial effects that:
1. the through type in-phase power supply can be implemented in a larger range, the electric split phase is canceled in the maximum range, and no through power is generated in the power grid.
2. The negative sequence centralized compensation is carried out by setting a traction substation in the in-phase power supply and transformation system, so that the whole structure of the system can be simplified most.
3. The required three-phase reactive power compensation device only generates a negative sequence component, does not generate a positive sequence component, namely does not occupy the positive sequence capacity of a power grid, and the three-phase compensation transformer matched with the device only transmits negative sequence power, does not transmit positive sequence power, has the technical advantage of no paying capacity electric charge, and simultaneously does not change the active power flow of a traction network of a traction power transformation station and does not increase the power loss of an additional traction network.
4. The traction network is communicated in phase in a larger range, so that the utilization of the electric energy of the regenerated train by the traction train is facilitated, the electricity consumption of the electric power system is reduced, and the energy-saving effect is greatly improved.
5. The reactive compensation device 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.
6. Superior performance, advanced technology, reliable method and easy implementation.
Drawings
Fig. 1 is a schematic structural diagram of an in-phase power supply and transformation system of an electrified railway in an embodiment of the invention.
FIG. 2 is a structural frame diagram of the measurement and control unit in an embodiment of the present invention.
FIG. 3 is a schematic diagram of the input/output relationship of the controller according to an embodiment of the present invention.
Detailed Description
In order to better understand the inventive concept, the working principle of the invention is as follows: the power factor of the AC-DC-AC train is very high, 1 can be considered, the power factors of all traction substations are the same, three-phase high-voltage buses PCC (negative sequence checking points) are used, the total negative sequence current generated at the PCC can be calculated by scalar algebraic sum, the total negative sequence current or power can be intensively compensated in one traction substation by installing a negative sequence compensation system, and the national standard requirement is met after the compensation, wherein the negative sequence compensation generates negative sequence current through a three-phase reactive power compensation device thereof, the active power flow of the in-phase power supply and transformation system is not changed, and meanwhile, the advantages of high power transmission and long transmission distance of the high-voltage transmission line are utilized, so that the power supply mileage of the electrified railway without split phase penetration is greatly prolonged.
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1, the embodiment of the invention provides an in-phase power supply and transformation system of an electrified railway, which comprises a first traction substation SS 1 Second traction substation SS 2 … … and an nth traction substation SS n Single-phase high-voltage transmission line HL and traction network 0CS, n is more than or equal to 2; the first traction substation (SS 1 ) Comprises a three-phase high-voltage bus (HB), a first main transformer (TT) connected with the three-phase high-voltage bus (HB) 1 ) And a negative sequence compensation device (NCS) connected to the three-phase high-voltage bus (HB); the second traction substation SS 2 … … and an nth traction substation SS n Are respectively connected with the single-phase high-voltage transmission line HL and the traction network 0 CS. In the direct power supply mode, the distance between adjacent traction transformer stations is generally about 50 km.
In the embodiment of the present invention, the first traction substation SS 1 Is a first main transformer TT of 1 Second traction substation SS 2 Is a second main transformer TT 2 … … and nth traction substation SS n N-th main transformer TT of (a) n All adopt single-phase wiring. The first main transformer TT 1 One end of the primary side is connected in series with a first current transformer CT 1 Then is connected with the A phase of the three-phase high-voltage bus HB, and the other end of the three-phase high-voltage bus HB is connected with the B phase of the three-phase high-voltage bus HB; the first main transformer TT 1 One end of the secondary side is connected with the traction net OCS, and the other end of the secondary side is grounded. The second main transformer TT 2 … … and nth main transformer TT n One end of the primary side of the single-phase high-voltage transmission line HL is connected with the phase A feeder line of the single-phase high-voltage transmission line, and the other end of the primary side of the single-phase high-voltage transmission line HL is connected with the phase B feeder line of the single-phase high-voltage transmission line; and one end of the secondary side of the second main transformer and one end of the secondary side of the nth main transformer are connected with the traction network, and the other ends of the secondary sides of the second main transformer and the nth main transformer are grounded.
The primary side of the three-phase compensation transformer of the negative sequence compensation device is connected with the phase A, the phase B and the phase C of the three-phase high-voltage bus, and the secondary side of the three-phase compensation transformer is connected with the three-phase reactive compensation device. The three-phase reactive power compensation device SVG 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.
Referring to fig. 2, in an embodiment of the present invention, the negative sequence compensation device NCS is installed in the first traction substation SS 1 And comprises a three-phase compensation transformer MT, a three-phase reactive power compensation device SVG connected with the three-phase compensation transformer MT and a measurement and control unit MC connected with the three-phase reactive power compensation device SVG. The measurement and control unit MC comprises a voltage transformer PT, a first current transformer CT 1 And a second current transformer CT 2 And a controller CD, the primary side of the voltage transformer PT is connected between the A phase and the B phase of the three-phase high-voltage bus HB in parallel, the first current transformer CT 1 The primary side is connected in series with the first traction substation SS 1 Is a first main transformer TT of 1 Primary side A phase feeder line, the second current transformer CT 2 The primary side is connected in series with an A-phase feeder line of the three-phase high-voltage bus HB for the single-phase high-voltage transmission line HL.
Referring to fig. 3 again, in the embodiment of the present invention, the input end of the controller CD is connected to the voltage transformer PT and the first current transformer CT respectively 1 And a second current transformer CT 2 The output end of the controller CD is connected with the three-phase reactive power compensation deviceThe control end of SVG is connected.
In the embodiment of the invention, the main transformer TT of the first traction substation 1 The primary side, the single-phase high-voltage transmission line HL and the voltage transformer PT can 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.
As shown in fig. 1, 2 and 3, the negative-sequence allowable capacity of the three-phase high-voltage bus HB is set to be S d Traction network load power factor=1, and the traction network load power factor is calculated by a voltage transformer PT and a current transformer CT 1 The measured instantaneous active power is s 1 (t), potential transformer PT and current transformer CT 2 The instantaneous active power measured synchronously is s 2 (t) instantaneous active power s at time instant t 1 (t) and instantaneous active Power s 2 The sum of (t) is s (t), the controller CD controls the instantaneous negative sequence power s output by the three-phase reactive power compensation device SVG at the moment t C The phase of (t) is opposite to that of s (t), and s C The size of (t) is: s is(s) C (t)＝s(t)-S d Wherein, when s C When (t) < 0, let s C (t) =0, representing the shutdown of the three-phase reactive compensation device SVG.
In summary, the embodiment of the invention sets a traction substation to perform negative sequence centralized compensation in the in-phase power supply and transformation system, so that the whole system structure is simplified to the greatest extent, the required three-phase reactive power compensation device 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 three-phase reactive power compensation device only transmits the negative sequence power, does not transmit the positive sequence power, has the technical advantage of paying no capacity electricity fee, and simultaneously does not change the active power flow of the traction network of the traction substation and does not increase the power loss of the additional traction network. The traction network is communicated in phase in a larger range, so that the utilization of the electric energy of the regenerated train by the traction train is facilitated, the electricity consumption of the electric power system is reduced, and the energy-saving effect is greatly improved. The reactive compensation device 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. Superior performance, advanced technology, reliable method and easy implementation.

Claims (7)

1. The utility model provides an electrified railway homophase power supply and transformation system, includes first traction substation (SS 1), second traction substation (SS 2), … … and nth traction substation (SSn) and single-phase high voltage transmission line (HL) and traction network (0 CS), its characterized in that: the first traction substation (SS 1) comprises a three-phase high-voltage bus (HB), a first main transformer (TT 1) connected with the three-phase high-voltage bus (HB) and a negative sequence compensation device (NCS) connected with the three-phase high-voltage bus (HB), and the first traction substation (SS 1) is connected with the traction network (0 CS); the single-phase high-voltage transmission line (HL) is connected with the three-phase high-voltage bus (HB), the second traction substation (SS 2), the … … and the nth traction substation (SSn) are respectively connected with the single-phase high-voltage transmission line (HL) and the traction network (0 CS), and n is more than or equal to 2; the negative sequence compensation device (NCS) is arranged in the first traction substation (SS 1) and comprises a three-phase compensation transformer (MT) for transmitting negative sequence power, a three-phase reactive compensation device (SVG) connected with the three-phase compensation transformer (MT) and used for generating a negative sequence component, and a measurement and control unit (MC) connected with the three-phase reactive compensation device (SVG).
2. The electrified railway in-phase power supply and transformation system of claim 1, wherein: the measurement and control unit (MC) comprises a voltage transformer (PT), a first current transformer (CT 1), a second current transformer (CT 2) and a Controller (CD), wherein the primary side of the voltage transformer (PT) is connected between an A phase and a B phase in the three-phase high-voltage bus (HB) in parallel, the primary side of the first current transformer (CT 1) is connected in series with an A-phase feeder of a primary side of a first main transformer (TT 1) of a first traction substation (SS 1), and the primary side of the second current transformer (CT 2) is connected in series with an A-phase feeder of the three-phase high-voltage bus (HB) to the single-phase high-voltage transmission line (HL).
3. An electrified railway in-phase power supply and transformation system according to claim 2, wherein: the input end of the Controller (CD) is respectively connected with the voltage transformer (PT), the first current transformer (CT 1) and the measuring end of the second current transformer (CT 2), and the output end of the Controller (CD) is connected with the control end of the three-phase reactive compensation device (SVG).
4. The electrified railway in-phase power supply and transformation system according to claim 1, characterized in that the first main transformer (TT 1) of the first traction substation (SS 1), the second main transformer (TT 2) of the second traction substation (SS 2) and the nth main transformer (TTn) of the nth traction substation (SSn) are all wired with a single phase.
5. The same-phase power supply and transformation system of the electrified railway according to claim 4, wherein one end of the primary side of the first main transformer (TT 1) is connected with the A of the three-phase high-voltage bus (HB) in series through the first current transformer (CT 1), and the other end of the primary side of the first main transformer is connected with the B of the three-phase high-voltage bus (HB); one end of the secondary side of the first main transformer (TT 1) is connected with the traction network (OCS), and the other end of the primary side is grounded.
6. An electrified railway in-phase power supply and transformation system according to claim 5, characterized in that the primary side ends of the second main transformers (TT 2, … …) and the nth main transformer (TTn) are respectively connected with the a-phase feeder line of the single-phase high-voltage transmission line (HL), and the other ends thereof are respectively connected with the B-phase feeder line of the single-phase high-voltage transmission line (HL); and one end of the secondary side of the second main transformer (TT 2) and the n-th main transformer (TTn) is connected with the traction network (OCS), and the other end of the secondary side is grounded.
7. An electrified railway in-phase power supply and transformation system according to any of the claims 1-6, characterized in that the primary side of the three-phase compensation transformer (MT) of the negative sequence compensation device (NCS) is connected to the a-phase, B-phase and C-phase of the three-phase high voltage bus (HB), and the secondary side of the three-phase compensation transformer (MT) is connected to the three-phase reactive compensation device (SVG).
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CN114336643B (en) * 2022-03-17 2022-05-17 西南交通大学 System for utilizing passing power of bilateral power supply traction network of regional station and control method
CN114336642B (en) * 2022-03-17 2022-06-07 西南交通大学 Bilateral power supply ride-through power utilization system of traction network and control method
CN114336639B (en) * 2022-03-17 2022-05-24 西南交通大学 Intelligent traction substation and power flow control method thereof

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