CN217824275U - Electrified railway cophase power supply system - Google Patents
Electrified railway cophase power supply system Download PDFInfo
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- CN217824275U CN217824275U CN202221515568.3U CN202221515568U CN217824275U CN 217824275 U CN217824275 U CN 217824275U CN 202221515568 U CN202221515568 U CN 202221515568U CN 217824275 U CN217824275 U CN 217824275U
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Abstract
The invention discloses an electrified railway in-phase power supply system, which comprises a three-phase high-voltage bus, a traction network bus, a traction transformer, a compensation transformer, a three-phase compensation device and a coordination control unit, wherein the three-phase high-voltage bus is connected with the traction network bus; two ends of the primary side of the traction transformer are respectively connected with the phase A and the phase B of the three-phase high-voltage bus, and two ends of the first secondary side of the traction transformer are respectively connected with the traction network bus and the steel rail; the two ends of the primary side of the three-phase compensation transformer are respectively connected with the phase B and the phase C of the three-phase high-voltage bus, one end of the secondary side of the compensation transformer is connected with one end of the second secondary side of the traction transformer, and the other end of the second secondary side of the traction transformer and the two ends of the secondary side of the compensation transformer are respectively correspondingly connected with the three-phase port of the three-phase compensation device; and the output end of the coordination control unit is connected with the three-phase compensation device. The invention not only can realize the railway full-line in-phase power supply and cancel the electric split phase, but also effectively realizes the technical and economic optimization of the electrified railway in-phase power supply, and simultaneously can solve the problem of electric energy quality mainly based on the negative sequence of a three-phase system caused by the load of an electric locomotive of the electrified railway.
Description
Technical Field
The invention relates to the field of power supply of alternating current electrified railways, in particular to an electrified railway in-phase power supply system.
Background
The electrified railway in China generally adopts a single-phase power frequency alternating current system, and in order to balance a single-phase traction load in a three-phase power system as much as possible, the electrified railway usually adopts a scheme of alternating phase sequence and split-phase partition power supply. The adjacent power supply sections at the split-phase partition form a split-phase insulator, which is called electric split-phase or split-phase. In order to prevent accidents such as burning of a contact net suspension component and even interphase short circuit of an electric locomotive due to electric phase separation in an electrified way, an automatic phase passing technology is adopted under the condition that a driver cannot manually perform step back, auxiliary unit connection, main breaker disconnection, neutral section passing by train inertia, main breaker connection, auxiliary unit connection and traction power restoration to complete phase passing along with the continuous rise of the speed of a train, a ground switch automatically switches over the phase passing, vehicle-mounted automatic phase passing and on-column automatic phase passing and the like, but a transient electric process of the train passing through the electric phase passing in the switch switching still exists, larger operation overvoltage or overcurrent is easily generated, accidents such as burning loss of a traction net and vehicle-mounted equipment and the like are caused, and the power supply reliability and the safe operation of the train are influenced. Therefore, the electric phase separation link is the weakest link in the whole traction power supply system, and the train phase separation becomes the bottleneck of traction power supply of the high-speed railway and even the whole electrified railway.
The core of the high-speed and heavy-duty railway is a plurality of groups of traction converters controlled by four-quadrant PWM and controlled in a multiple mode, the harmonic content is small in actual operation, the power factor is close to 1, but the traction power of the AC-DC-AC electric locomotive or the motor train unit is large, for example, the rated power of a single-car high-speed motor train unit operated in a large marshalling reaches 25MW (equivalent to a common-speed railway 5 train), and the increasingly serious electric energy quality problem mainly comprising three-phase voltage unbalance (negative sequence) caused by the large-number running high-power single-phase loads to a three-phase power grid cannot be paid attention.
Theories and practices show that the adoption of the in-phase power supply technology can effectively treat negative sequence current while canceling the electric phase splitting at the outlet of the traction substation and eliminating the power supply bottleneck, so that the electric energy quality requirement mainly based on the three-phase voltage unbalance degree (negative sequence) limit value is met, and the harmonious development of electric power and railways is facilitated.
Disclosure of Invention
The invention aims to provide an electrified railway in-phase power supply system, which not only can realize railway full-line in-phase power supply and cancel electric phase splitting, but also can effectively realize the technical and economic optimization of the electrified railway in-phase power supply, and simultaneously can solve the problem of electric energy quality mainly based on a three-phase system negative sequence caused by the load of an electric locomotive of an electrified railway.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an in-phase power supply system of an electrified railway comprises a three-phase high-voltage bus, a traction transformer, a compensation transformer, a three-phase compensation device and a coordination control unit;
the two ends of the primary side of the traction transformer are respectively connected with the phase A and the phase B of the three-phase high-voltage bus, and the two ends of the first secondary side of the traction transformer are respectively connected with a traction network bus and a steel rail; the two ends of the primary side of the three-phase compensation transformer are respectively connected with the phase B and the phase C of the three-phase high-voltage bus, one end of the secondary side of the compensation transformer is connected with one end of the secondary side of the traction transformer, and the other end of the secondary side of the traction transformer and the two ends of the secondary side of the compensation transformer are respectively correspondingly connected with the three-phase port of the three-phase compensation device; and the output end of the coordination control unit is connected with the three-phase compensation device.
Further, the three-phase compensation device comprises a first three-phase compensation unit, a second three-phase compensation unit, a phase compensation unit 8230, a phase compensation unit n; the three-phase compensation device comprises a first three-phase compensation unit, a second three-phase compensation unit, a third three-phase compensation unit, a fourth three-phase compensation unit, a fifth three-phase compensation unit and a sixth three-phase compensation unit.
Further, the coordination control unit comprises a first voltage transformer, a second voltage transformer, a current transformer and a controller; the input end of the controller is respectively connected with the measuring end of the first voltage transformer, the measuring end of the second voltage transformer and the measuring end of the current transformer, and the output end of the controller is respectively connected with the control ends of the first three-phase compensation unit, the second three-phase compensation unit, \8230;, and the nth three-phase compensation unit.
Further, the first voltage transformer is connected to the phase A and the phase B of the three-phase high-voltage bus, and the second voltage transformer is connected to the phase B and the phase C of the three-phase high-voltage bus.
Furthermore, one end of the first secondary side of the traction transformer is led to a traction network bus through the current transformer.
Further, the first three-phase compensation unit, the second three-phase compensation unit, \8230 \ 8230;, and the nth three-phase compensation unit are three-phase AC-DC converters.
Compared with the prior art, the invention has the beneficial effects that:
1. in the system, the three-phase compensation device only generates a negative sequence component, namely, the negative sequence of the power grid can be controlled to meet the unbalanced degree of the three-phase voltage without changing the active power flow of the traction grid of the traction substation;
2. the invention provides a novel combination of a single-phase multi-secondary winding traction transformer, a single-phase compensation transformer and a three-phase negative sequence compensation device, realizes the optimal configuration of the transformer capacity with the same effect, saves the production cost, improves the operation flexibility of a traction substation, and can cancel an electric phase splitting link at an outlet of the traction substation.
3. The three-phase compensation device can be operated in parallel according to the capacity, and the expansion of the compensation capacity is easy.
4. The invention can save complex multi-winding matching transformer in the original in-phase power supply system and save cost.
5. The three-phase compensation device of the invention replaces a back-to-back converter in the original in-phase power supply system, thereby saving the cost.
Drawings
Fig. 1 is a schematic structural diagram of an electrified railway in-phase power supply system according to an exemplary embodiment.
Fig. 2 is a schematic diagram of a relationship structure between a coordinated control unit and a three-phase compensation device provided according to an exemplary embodiment.
Detailed Description
In order that the invention may be better understood, the invention will now be further described with reference to the accompanying drawings and detailed description.
As shown in fig. 1 and 2, the present embodiment provides an in-phase power supply system for an electrified railway, the in-phase power supply system includes a three-phase high-voltage bus HB, a traction transformer TT, a compensation transformer MT, a three-phase compensation device NC, and a coordination control unit MC;
the two ends of the primary side of the traction transformer TT are connected with the phase A and the phase B of the three-phase high-voltage bus HB respectively, and the two ends of the primary side of the traction transformer TT are connected with the traction network bus OCS and the steel rail R respectively; two primary sides of the three-phase compensation transformer MT are respectively connected with the phase B and the phase C of the three-phase high-voltage bus HB, one end of a secondary side of the compensation transformer MT is connected with one end of a secondary side of the traction transformer TT, and the other end of the secondary side of the traction transformer TT and two ends of the secondary side of the compensation transformer MT are respectively connected with three-phase ports of the three-phase compensation device NC correspondingly; and the output end of the coordination control unit MC is connected with the three-phase compensation device NC. In this embodiment, the compensating transformer MT is a single-phase connection transformer, and the voltage transformation ratio between the primary side and the first secondary side of the traction transformer TT is K 1 The voltage transformation ratio of the primary side and the secondary side of the traction transformer TT is K 2 The voltage transformation ratio of the primary side and the secondary side of the compensating transformer MT is K 3 In which K is 1 、K 2 、K 3 Electricity between the threeThe voltage-to-variable ratio relationship may be set according to actual conditions, for example, let K2= K3. The traction transformer TT transmits the line voltage of the three-phase high-voltage bus HB to the traction bus OCS through the primary side and the first secondary side winding, and the second secondary side of the traction transformer TT and the secondary side winding of the compensating transformer MT form the compensating transformer for compensating and governing negative sequence power brought by the load of the electric locomotive and unbalance of a three-phase power grid.
Preferably, the three-phase compensation device NC comprises a first three-phase compensation unit AD 1 A second three-phase compensation unit AD 2 The n three-phase compensation unit AD has the advantages of (8230) (\ 8230) ("n three-phase compensation unit AD n (ii) a The first three-phase compensation unit AD 1 A second three-phase compensation unit AD 2 The n three-phase compensation unit AD has the advantages of (8230) (\ 8230) ("n three-phase compensation unit AD n Are connected in parallel with each other. Here, n is a positive integer.
Preferably, as shown in fig. 2, the coordinated control unit MC comprises a first voltage transformer PT 1 A second voltage transformer PT 2 A current transformer CT and a controller CC; the input end of the controller CC is respectively connected with the first voltage transformer PT 1 The measuring terminal and the second voltage transformer PT 2 The measuring terminal of the current transformer CT is connected, the output terminal of the controller CC is respectively connected with the first three-phase compensation unit AD 1 A second three-phase compensation unit AD 2 The n three-phase compensation unit AD has the advantages of (8230) (\ 8230) ("n three-phase compensation unit AD n Is connected.
Preferably, the first voltage transformer PT 1 A phase A and a phase B connected to the three-phase high-voltage bus HB, and a second voltage transformer PT 2 And the phase B and the phase C are connected to the three-phase high-voltage bus HB.
Preferably, one end of the first primary side of the traction transformer TT is led to the traction network bus OCS through the current transformer CT.
Preferably, the first three-phase compensation unit AD 1 A second three-phase compensation unit AD 2 823060, 8230a n three-phase compensation unit AD n Is a three-phase AC-DC converter.
In this embodiment, the traction transformer TT supplies power to the traction network bus OCS, the coordination control unit MC calculates the negative sequence power of the traction network bus OCS, and then transmits the negative sequence power to the three-phase compensation device NC, and the compensation transformer MT and the three-phase compensation device NC are used for compensating and managing the negative sequence power and the imbalance of the grid voltage caused by the single-phase load of the electric locomotive. If necessary, the three-phase compensation device NC can also provide the reactive power and the harmonic compensation current required by the traction load.
In the embodiment of the invention, the comprehensive compensation method for compensating and managing the negative sequence power brought by the single-phase load of the electric locomotive and the voltage unbalance of the power grid by using the compensation transformer MT and the three-phase compensation device NC comprises the following specific steps:
(1) The coordination control unit firstly reads a first voltage transformer PT on a three-phase high-voltage bus 1 Voltage value of and a second voltage transformer PT 2 The voltage value of the three-phase high-voltage bus and the current value of the current transformer CT are calculated
And traction load current
Finally, calculating the active power P on the traction bus through the instantaneous power theory L And reactive power Q L ；
(2) In order to compensate the negative sequence current component and the positive sequence current reactive component of the traction load introduced on the three-phase high-voltage bus, the power supply only provides the active power of the traction load based on the instantaneous power theory and according to the complete compensation condition, namely the three-phase compensation device completely compensates the negative sequence current component and the positive sequence current reactive component, so that the active power P at the inlet wire of the three-phase high-voltage bus can be obtained HB ＝P L Reactive power Q HB =0, voltage combined three-phase high-voltage bus
The total current at the inlet wire of the three-phase high-voltage bus can be calculated
(3) Will draw current on the bus
Converted to three-phase high-voltage bus
(4) According to kirchhoff's current law, the total current at the inlet of the three-phase high-voltage bus subtracts the current conversion value on the traction bus
The current (converted to the three-phase high-voltage side) to be compensated of the three-phase compensation device can be obtained
(4) Because the primary side and secondary side currents of the traction transformer TT and the compensating transformer MT have the same phase, the currents to be compensated by the three-phase compensating device NC are
(5) According to the instantaneous power theory
And converting into negative sequence current and positive sequence reactive current which need to be compensated by the three-phase compensation device.
(6) And dividing the negative sequence current and the positive sequence reactive current which are converted into the negative sequence current and the positive sequence reactive current to be compensated by the three-phase compensation device NC into current commands of each compensation unit according to the number of the compensation units in the three-phase compensation device NC, and transmitting the current commands to each compensation unit.
(7) And when the current instruction received by each compensation unit is larger than the current corresponding to the maximum capacity of each compensation unit, each compensation unit operates according to the maximum capacity.
In conclusion, the in-phase power supply system can realize the full-line in-phase power supply of the railway without phase splitting, and ensures the high-speed and heavy-load operation of the locomotive; meanwhile, the system can eliminate the negative sequence, reactive power and harmonic influence of the railway traction load on the electric energy of the public power grid. The three-phase compensation transformer adopted by the invention is connected with a plurality of three-phase AC-DC converters, thus being beneficial to reducing the cost and being convenient to implement.
Claims (6)
1. The in-phase power supply system of the electrified railway is characterized by comprising a three-phase high-voltage bus (HB), a Traction Transformer (TT), a compensating transformer (MT), a three-phase compensating device (NC) and a coordination control unit (MC);
the two ends of the primary side of the Traction Transformer (TT) are respectively connected with the phase A and the phase B of the three-phase high-voltage bus (HB), and the two ends of the primary side of the Traction Transformer (TT) are respectively connected with the traction network bus (OCS) and the steel rail (R); two primary sides of the three-phase compensation transformer (MT) are respectively connected with the phase B and the phase C of the three-phase high-voltage bus (HB), one end of a secondary side of the compensation transformer (MT) is connected with one end of a second secondary side of the Traction Transformer (TT), and the other end of the second secondary side of the Traction Transformer (TT) and two ends of the secondary side of the compensation transformer (MT) are respectively correspondingly connected with three-phase ports of the three-phase compensation device (NC); the output of the coordinated control unit (MC) is connected to the three-phase compensation device (NC).
2. The system according to claim 1, characterized in that said three-phase compensation means (NC) comprise a first three-phase compensation unit (AD) 1 ) A second three-phase compensation unit (AD) 2 ) 823060, 82303080, and n three-phase compensation unit (AD) n ) (ii) a The first three-phase compensation unit (AD) 1 ) A second three-phase compensation unit (AD) 2 ) 8230the n-th three-phase compensation unit (AD) n ) Are connected in parallel with each other.
3. According to claim2 said system for co-phased supply of electric railways, characterized in that said coordinated control unit (MC) comprises a first Potential Transformer (PT) 1 ) A second voltage transformer (PT) 2 ) A Current Transformer (CT) and a controller (CC); the input terminal of the controller (CC) is connected with the first voltage transformer (PT) 1 ) Said second voltage transformer (PT) 2 ) The measuring end of the Current Transformer (CT) is connected, and the output end of the controller (CC) is respectively connected with the first three-phase compensation unit (AD) 1 ) A second three-phase compensation unit (AD) 2 ) 823060, 823030w, and the n three-phase compensation unit (AD) n ) Is connected with the control end of the controller.
4. The electrified railroad in-phase power supply system of claim 3, wherein the first voltage transformer (PT) 1 ) A phase A and a phase B connected to the three-phase high-voltage bus (HB), the second voltage transformer (PT) 2 ) And the phase B and the phase C are connected to the three-phase high-voltage bus (HB).
5. The electrified railroad in-phase power supply system of claim 3, wherein the first secondary side of the Traction Transformer (TT) is routed to a traction network bus (OCS) through the Current Transformer (CT).
6. The system of the electrified railway in-phase power supply according to claim 2, characterized in that said first three-phase compensation unit (AD) 1 ) A second three-phase compensation unit (AD) 2 ) "\ 8230; \ 8230;" and n-th three-phase compensation unit (AD) n ) Is a three-phase AC-DC converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221515568.3U CN217824275U (en) | 2022-06-17 | 2022-06-17 | Electrified railway cophase power supply system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221515568.3U CN217824275U (en) | 2022-06-17 | 2022-06-17 | Electrified railway cophase power supply system |
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| CN217824275U true CN217824275U (en) | 2022-11-15 |
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| CN202221515568.3U Active CN217824275U (en) | 2022-06-17 | 2022-06-17 | Electrified railway cophase power supply system |
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