CN104979827A - Electrified railway power supply device and system thereof - Google Patents
Electrified railway power supply device and system thereof Download PDFInfo
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- CN104979827A CN104979827A CN201510391657.XA CN201510391657A CN104979827A CN 104979827 A CN104979827 A CN 104979827A CN 201510391657 A CN201510391657 A CN 201510391657A CN 104979827 A CN104979827 A CN 104979827A
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Abstract
The invention provides an electrified railway power supply device and a system thereof. The electrified railway power supply device comprises a three-phase transformer, four three-phase converters, at least four single-phase converters and a single-phase transformer. The primary side of the three-phase transformer is connected with a three-phase high-voltage utility grid. The secondary side of the three-phase transformer is connected with the input sides of the three-phase converters. The output sides of the three-phase converters are connected with the input sides of the single-phase converters. The output sides of the single-phase converters are connected with the secondary side of the single-phase transformer. The primary side of the single-phase transformer outputs a single-phase AC voltage to an electrified railway traction power supply network. According to the invention, the three-phase AC power is converted into the single-phase AC power, so that the power phase separation problem can be completely eliminated.
Description
Technical field
The present invention relates to power domain, particularly relate to a kind of electrified railway power supply device and system thereof.
Background technology
At present, the incompatibility phenomenon of China's attached wires of AC electrified railway electric power system when being applied to high speed passenger transportation and Heavy-haul Freight is day by day obvious.The motor train unit of high speed passenger transportation and the alternating current electric locomotive of Heavy-haul Freight all need AC single phase electricity, in current electric power system structure, no matter take which kind of mode, all can produce the three-phase imbalance of electric power system, and then produce negative-sequence current, affect electric power system power supply quality.
For avoiding producing larger threephase load imbalance, traction substation adopts commutation to connect, by traction substation transformer primary side rotation access Three-phase Power Systems, after commutation connects, each power supply section adopts neutral section insulator isolation, the i.e. generation of " electric phase-splitting ", due to the generation of electric phase-splitting, train point to get along problems such as producing the complicated and pantograph arcing of speed loss, operation easier.
Generally there are two kinds of approach in existing cophase supply technical scheme, a kind of scheme for increasing flow controller on three-phase two-phase transformer foundation, a kind of for use single-phase AC-DC-AC converter back-to-back carry out two-phase power conversion scheme, above two schemes, the common issue of existence is that transformer device structure more complicated, capacity utilization are not high.
Summary of the invention
The invention provides a kind of electrified railway power supply device and system thereof, to solve above-mentioned one or more disappearance.
The invention provides a kind of electrified railway power supply device, described electrified railway power supply device comprises a three-phase transformer, four 3-phase power converters, at least four single-phase converters and a single-phase transformer; Wherein, the former limit of described three-phase transformer is connected with three-phase high-voltage utility network, the secondary limit of described three-phase transformer is connected with the input side of described 3-phase power converter, the outlet side of described 3-phase power converter is connected with the input side of described single-phase converter, the outlet side of described single-phase converter is connected with the secondary limit of described single-phase transformer, and the former limit output single-phase alternating voltage of described single-phase transformer is to electric railway traction power supply network.
In an embodiment, the former limit of described three-phase transformer is Y connection, and the secondary limit of described three-phase transformer comprises four groups of three-phase transformers and exports, and wherein two groups of three-phase transformers export as Y connection, and all the other two groups of three-phase transformers export as Δ shape connection; The input side of described four 3-phase power converters exports with three-phase transformer described in four groups respectively and connects one to one.
In an embodiment, the secondary limit of described single-phase transformer comprises at least four limit windings, and described time limit winding connects one to one with the outlet side of described single-phase converter respectively; The former limit of described single-phase transformer comprises at least four former limit windings, and the tap series connection of described former limit winding exports described single-phase AC voltage.
In an embodiment, described electrified railway power supply device comprises: circuit breaker and isolating switch, is all arranged at the side on the former limit of described three-phase transformer.
In an embodiment, described electrified railway power supply device comprises: circuit breaker and isolating switch, is all arranged at the side on the former limit of described single-phase transformer.
In an embodiment, the outlet side of described 3-phase power converter is connected in parallel to Support Capacitor; The input side of described single-phase converter is connected in parallel to Support Capacitor.
In an embodiment, described 3-phase power converter and described single-phase converter all adopt three-level structure and PWM to control.
In an embodiment, be connected by overvoltage protecting device and high-pass filtering device between the outlet side of described 3-phase power converter and the input side of described single-phase converter.
In an embodiment, described three-phase transformer and described single-phase transformer are the transformer of 50Hz.
The present invention also provides a kind of electrified railway power supply system, and described electrified railway power supply system comprises: the electrified railway power supply device as described in the various embodiments described above, as described in three-phase high-voltage utility network, control cubicle, cooling device and as described in electric railway traction power supply network; Wherein, the side on the side on the former limit of described three-phase transformer and the former limit of described single-phase transformer is provided with circuit breaker and isolating switch; Described cooling device is connected to lower the temperature with at least one in described three-phase transformer, described 3-phase power converter, described single-phase converter, described over-voltage protector, described high-pass filtering device and described single-phase transformer; Described control cubicle is all connected with described 3-phase power converter, described single-phase converter, described over-voltage protector, described circuit breaker and described isolating switch, to control its operating state; The power supply system of described three-phase high-voltage utility network is 110kV, 50Hz or 220kV, 50Hz; Described electric railway traction power supply network power supply system is 55kV, 50Hz or 27.5kV, 50Hz.
The present invention by public high-voltage fence electric energy after three-phase transformer pressure regulation, through 3-phase power converter and single-phase converter conversion, then through single-phase transformer pressure regulation, can be formed traction substation single-phase electric energy and exports.Several traction substation Parallel opertation, form a single phase place electric network composition, realize cophase supply.
The electrified railway power supply Apparatus and system of the embodiment of the present invention, the traction power supply net that all traction substations in railway line can be made to provide forms a unified single phase system, eliminates electric phase-splitting.Meanwhile, each electric substation is greater than by designing its capacity the output capacity that this electric substation powers needed for section, and when off-grid is broken down in an electric substation, other adjacent electric substations can port redundancy capacity rapidly, thus ensures the stable operation of traction power supply net.In addition the present invention completely eliminates the negative-sequence current problem that traction power supply net three-phase imbalance brings to public power supply network, takes full advantage of prior art, improves the service efficiency of transformer.The present invention itself can adopt modularized design, has taken into full account design margin, improves the reliability of cophase supply system.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.In the accompanying drawings:
Fig. 1 is the circuit diagram of the electrified railway power supply device of the embodiment of the present invention;
Fig. 2 is the circuit diagram of the 3-phase power converter in one embodiment of the invention;
Fig. 3 is the circuit diagram of the single-phase converter in one embodiment of the invention;
Fig. 4 is the structural representation of the electrified railway power supply system of the embodiment of the present invention.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further details.At this, schematic description and description of the present invention is for explaining the present invention, but not as a limitation of the invention.
Fig. 1 is the circuit diagram of the electrified railway power supply device of the embodiment of the present invention.As shown in Figure 1, electrified railway power supply device comprises three-phase transformer part 110,3-phase power converter part 120, single-phase converter part 140 and single-phase transformer part 150.Three-phase transformer part 110 is containing a three-phase transformer T1, and 3-phase power converter part 120 is containing four 3-phase power converter A, and single-phase converter part 140 is containing at least four single-phase converter B, and single-phase transformer part 150 is containing a single-phase transformer T2.
The former limit (input side/left side) of three-phase transformer T1 is connected with three-phase high-voltage utility network, and this three-phase high-voltage utility grid standard can be 110kV, 50Hz or 220kV, 50Hz.The secondary limit (outlet side/the right) of three-phase transformer T1 is connected with the input side of 3-phase power converter A, the outlet side of 3-phase power converter A is connected with the input side of single-phase converter B, the outlet side of single-phase converter B is connected with the secondary limit of single-phase transformer T2, the former limit output single-phase alternating voltage of single-phase transformer T2 is to electric railway traction power supply network, and this electric railway traction power supply network can be electric locomotive provides supply of electric power.
Three-phase transformer T1 can be used for the three-phase alternating voltage be reduced to by the three-phase alternating current that three-phase high-voltage utility network inputs needed for 3-phase power converter A, 3-phase power converter A can be used for three-phase alternating voltage to be converted to direct voltage, single-phase converter B can be used for direct voltage to be converted to single-phase AC voltage, and single-phase transformer T2 is used for the single-phase AC voltage be converted to by the single-phase AC voltage that single-phase converter B exports needed for electric railway traction power supply network.
The electrified railway power supply device of the embodiment of the present invention, by three-phase transformer, 3-phase power converter, single-phase converter and single-phase transformer, three-phase alternating current is converted to single-phase alternating current, electric railway cophase supply completely can be realized, eliminate threephase load energy imbalance, cancel electric phase-splitting to arrange, ensure stable, the Effec-tive Function of electric power system simultaneously, ensure punctual, the high-speed cruising of train.
In an embodiment, again as shown in Figure 1, the former limit of three-phase transformer T1 can be Y connection, the secondary limit of three-phase transformer T1 can comprise four groups of three-phase transformers and export (namely time limit winding exports), wherein two groups of three-phase transformers export and can be Y connection, and all the other two groups of three-phase transformers export and can be Δ shape connection.The input side of four 3-phase power converter A exports with four groups of three-phase transformers respectively and connects one to one, namely wherein two 3-phase power converter A export with the Y shape time limit winding of two groups of three-phase transformer T1 and are connected, and two other 3-phase power converter A exports with the △ shape secondary limit winding of three-phase transformer T1 and is connected.
Fig. 2 is the circuit diagram of the 3-phase power converter in one embodiment of the invention.As shown in Figure 2, each 3-phase power converter A as shown in Figure 1 can contain electronic power switch parts VT1a ~ VT4a, D1a ~ D6a, VT1b ~ VT4b, D1b ~ D6b, VT1c ~ VT4c, D1c ~ D6c and electric capacity C1, C2.Wherein, the input side 3AC of 3-phase power converter A contains three end lines, with the secondary limit winding switching of three-phase transformer T1.Three lines of the outlet side of 3-phase power converter A in three end lines difference corresponding diagram 1 of the outlet side of 3-phase power converter A.
The electrified railway power supply device of the embodiment of the present invention, containing four 3-phase power converters, the capacity needs of traction substation only can be met by three 3-phase power converters, in other words, when reducing any one in four 3-phase power converters, the total capacity of all the other 3-phase power converters is greater than the output capacity needed for traction substation.Therefore, any one 3-phase power converter breaks down, and all can not affect the normal operation of homophase electrified railway power supply device.
Fig. 3 is the circuit diagram of the single-phase converter in one embodiment of the invention.As shown in Figure 3, the single-phase converter B shown in Fig. 1 can contain electronic power switch parts VT1a ~ VT4a, D1a ~ D6a, VT1b ~ VT4b, D1b ~ D6b and electric capacity C1, C2.Wherein, the input side (left side) of single-phase converter B is containing three end lines, three lines of the input side of single-phase converter B in difference corresponding diagram 1, the outlet side 2AC of single-phase converter B contains two end lines, two lines of the outlet side of single-phase converter in difference corresponding diagram 1.
The electrified railway power supply device of the embodiment of the present invention, containing at least four single-phase converters, the capacity needs of traction substation only can be met by three single-phase converters, in other words, when reducing any one single-phase converter, the total capacity of all the other single-phase converters is greater than the output capacity needed for traction substation.Therefore, any one single-phase converter breaks down, and all can not affect the normal operation of cophase supply electrified railway power supply device.
In an embodiment, more as shown in Figure 1, the secondary limit (input side) of single-phase transformer T2 can comprise at least four limit windings, and above-mentioned time limit winding can connect one to one with the outlet side of above-mentioned each single-phase converter B respectively.The former limit (outlet side) of single-phase transformer T2 can comprise at least four former limit windings, and the tap of above-mentioned former limit winding can be connected and be exported above-mentioned single-phase AC voltage (output of traction substation single-phase voltage) to above-mentioned electric railway traction power supply network.
In an embodiment, the three-phase transformer T1 shown in Fig. 1 can be the transformer of 50Hz, to access the three-phase high-voltage utility network of 50Hz; Single-phase transformer T2 shown in Fig. 1 also can be the transformer of 50Hz, to export the energy of the 50Hz frequency needed for electric railway traction power supply network.
In the embodiment of the present invention, three-phase transformer and single-phase transformer adopt the transformer of 50Hz, can match, and meet the demand of electric railway traction power supply network with the supply standard of three-phase high-voltage utility network.
Again as shown in Figure 1, the electrified railway power supply device of the embodiment of the present invention also can comprise an intermediate DC link 130.In this intermediate DC link 130, excess voltage protection and high-pass filtering circuit can be set.In an embodiment; this excess voltage protection can be made up of electronic power switch parts VT, a D and resistance R; this high-pass filtering circuit can be made up of an electric capacity C, an inductance L and a resistance R, then the intermediate DC link 130 shown in Fig. 1 is containing two groups of overvoltage crowbars and high-pass filtering circuit.In other embodiments, excess voltage protection and high-pass filtering circuit can realize by other circuit forms.
Above-mentioned excess voltage protection can be realized by the form of overvoltage protecting device, and above-mentioned high-pass filtering circuit can be realized by high-pass filtering device.After increasing intermediate DC link 130, not directly be connected between the outlet side of 3-phase power converter T1 and the input side of single-phase converter T2, but be connected with high-pass filtering device by overvoltage protecting device.
In the embodiment of the present invention, too high direct voltage can be consumed by the resistance in overvoltage protecting device or excess voltage protection, to ensure that direct voltage in DC link is in normal range (NR); Can be used for filtering DC side high order harmonic component by high-pass filtering device or high-pass filtering circuit.
In an embodiment, the 3-phase power converter T1 shown in Fig. 1 and single-phase converter T2 all can adopt three-level structure, and adopts PWM to control.As shown in Figure 1, the outlet side of 3-phase power converter A contains three output lines, respectively corresponding varying level, and the input side of single-phase converter B is also containing three input end lines, respectively corresponding varying levels.In other embodiments, other many level block can also be adopted.
In the embodiment of the present invention, adopt three-level structure and PWM to control, effectively can reduce harmonic content, reduce power switch pipe electric pressure, improve power factor, realize the mutual transmission etc. of energy in alternating current-direct current both sides.
In an embodiment, the outlet side of the 3-phase power converter A shown in Fig. 1 can be connected in parallel to Support Capacitor C, and each 3-phase power converter A can be connected in parallel two Support Capacitors; The input side of single-phase converter B also can be connected in parallel to Support Capacitor C, and each single-phase converter B can be connected in parallel two Support Capacitors.
In the embodiment of the present invention, by being connected Support Capacitor in the DC side of 3-phase power converter with the DC side parallel of single-phase converter, the stability of direct voltage effectively can be improved.
As shown in Figure 1, the electrified railway power supply device of the embodiment of the present invention also can comprise control switch part.In an embodiment, the control switch part 160 comprising circuit breaker K1 and isolating switch K2 (such as three-phase isolation switch) is arranged on the side on the former limit of three-phase transformer A, i.e. input side, alternatively the position of three-phase high-voltage utility network input voltage to electrified railway power supply device, to access and to disconnect the control of three-phase high-voltage utility network.
In another embodiment, the control switch part 170 comprising circuit breaker K1 and isolating switch K2 can be arranged on the side on the former limit of single-phase transformer B, i.e. outlet side, also can be the input of electric railway traction power supply network, to access and to disconnect the control that above-mentioned single-phase AC voltage is delivered to this electric railway traction power supply network.
In other embodiments, various electrified railway power supply devices shown in Fig. 1 can comprise control switch part 160 and control switch part 170 simultaneously, to control whether to access the voltage of three-phase high-voltage utility network in the lump and whether above-mentioned single-phase AC voltage to be delivered to this electric railway traction power supply network.
In the various embodiments described above, using the element of same-sign can represent that these elements belong to same function element, must not be that value capacity, type are identical." connection " in the various embodiments described above can be direct connection, also can be indirect connection, comprises other parts namely.The present invention is all not construed as limiting this." the former limit " of above-mentioned transformer is relative concept with " secondary limit ", and in embodiments of the present invention, " the former limit " of transformer can have higher voltage, and " the secondary limit " of transformer can have lower voltage.
The embodiment of the present invention also provides a kind of electrified railway power supply system.Fig. 4 is the structural representation of the electrified railway power supply system of the embodiment of the present invention, as shown in Figure 4, electrified railway power supply system comprises: the electrified railway power supply device shown in above-mentioned Fig. 1 to Fig. 3, also comprises three-phase high-voltage utility network 200, control cubicle 400, cooling device 300 and electric railway traction power supply network 500.
Cooling device 300 can be connected with one or more in the three-phase transformer T1 in electrified railway power supply device, 3-phase power converter A, single-phase converter B and single-phase transformer T2, to lower the temperature to transformer or current transformer.Cooling device 300 can be connected with one or more in the over-voltage protector in intermediate DC link part 130, high-pass filtering device, to lower the temperature to the one or more device in intermediate DC link part 130 or element.The validity of device in electrified railway power supply device or element is ensured with this.
Control cubicle 400 all can be connected with the over-voltage protector in the 3-phase power converter A in electrified railway power supply device, single-phase converter B and intermediate DC link part 130, high-pass filtering device, to manipulate the operating state of each part mentioned above.Control cubicle 400 also can be connected with the circuit breaker K1 in electrified railway power supply device and/or isolating switch K2, to manipulate the state of control switch part 160 and/or control switch part 170.
In electrified railway power supply system, this three-phase high-voltage utility grid standard can be 110kV, 50Hz or 220kV, 50Hz, namely the voltage exporting electrified railway power supply device to can be 110kV or 220kV, and frequency can be 50Hz, to match with national grid supply standard.This electric railway traction power supply network power supply system can be 55kV, 50Hz or 27.5kV, 50Hz, and namely required input voltage can be 55kV or 27.5kV, and required input frequency can be 50Hz, to meet the energy requirement of electric locomotive.
Electrified railway power supply device in the electrified railway power supply system of the embodiment of the present invention can be the situation of above-mentioned any embodiment, and its effect that can reach also can be described above, therefore do not repeat them here.
It should be noted that, the control cubicle in electrified railway power supply system, cooling device also can optionally be arranged in electrified railway power supply device, at this, are only that the affiliated division of part is different, do not limit the part of electrified railway power supply device.
The present invention by public high-voltage fence electric energy after three-phase transformer pressure regulation, through 3-phase power converter and single-phase converter conversion, then through single-phase transformer pressure regulation, can be formed traction substation single-phase electric energy and exports.Several traction substation Parallel opertation, form a single phase place electric network composition, realize cophase supply.
The electrified railway power supply Apparatus and system of the embodiment of the present invention, the traction power supply net that all traction substations in railway line can be made to provide forms a unified single phase system, eliminates electric phase-splitting.Meanwhile, each electric substation is greater than by designing its capacity the output capacity that this electric substation powers needed for section, and when off-grid is broken down in an electric substation, other adjacent electric substations can port redundancy capacity rapidly, thus ensures the stable operation of traction power supply net.In addition the present invention completely eliminates the negative-sequence current problem that traction power supply net three-phase imbalance brings to public power supply network, takes full advantage of prior art, improves the service efficiency of transformer.The present invention itself can adopt modularized design, has taken into full account design margin, improves the reliability of cophase supply system.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; the protection range be not intended to limit the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an electrified railway power supply device, is characterized in that, described electrified railway power supply device comprises a three-phase transformer, four 3-phase power converters, at least four single-phase converters and a single-phase transformer; Wherein:
The former limit of described three-phase transformer is connected with three-phase high-voltage utility network, the secondary limit of described three-phase transformer is connected with the input side of described 3-phase power converter, the outlet side of described 3-phase power converter is connected with the input side of described single-phase converter, the outlet side of described single-phase converter is connected with the secondary limit of described single-phase transformer, and the former limit output single-phase alternating voltage of described single-phase transformer is to electric railway traction power supply network.
2. electrified railway power supply device as claimed in claim 1, is characterized in that:
The former limit of described three-phase transformer is Y connection, and the secondary limit of described three-phase transformer comprises four groups of three-phase transformers and exports, and wherein two groups of three-phase transformers export as Y connection, and all the other two groups of three-phase transformers export as Δ shape connection;
The input side of described four 3-phase power converters exports with three-phase transformer described in four groups respectively and connects one to one.
3. electrified railway power supply device as claimed in claim 1, is characterized in that, the secondary limit of described single-phase transformer comprises at least four limit windings, and described time limit winding connects one to one with the outlet side of described single-phase converter respectively; The former limit of described single-phase transformer comprises at least four former limit windings, and the tap series connection of described former limit winding exports described single-phase AC voltage.
4. electrified railway power supply device as claimed in claim 1, described electrified railway power supply device comprises: circuit breaker and isolating switch, is all arranged at the side on the former limit of described three-phase transformer.
5. electrified railway power supply device as claimed in claim 1, described electrified railway power supply device comprises: circuit breaker and isolating switch, is all arranged at the side on the former limit of described single-phase transformer.
6. electrified railway power supply device as claimed in claim 1, it is characterized in that, the outlet side of described 3-phase power converter is connected in parallel to Support Capacitor; The input side of described single-phase converter is connected in parallel to Support Capacitor.
7. the electrified railway power supply device as described in any one of claim 1 to 6, is characterized in that, described 3-phase power converter and described single-phase converter all adopt three-level structure and PWM to control.
8. the electrified railway power supply device as described in any one of claim 1 to 6, is characterized in that, is connected between the outlet side of described 3-phase power converter and the input side of described single-phase converter by overvoltage protecting device and high-pass filtering device.
9. electrified railway power supply device as claimed in claim 1, it is characterized in that, described three-phase transformer and described single-phase transformer are the transformer of 50Hz.
10. an electrified railway power supply system, it is characterized in that, described electrified railway power supply system comprises: electrified railway power supply device, described three-phase high-voltage utility network, control cubicle, cooling device and described electric railway traction power supply network as claimed in claim 8; Wherein,
The side on the side on the former limit of described three-phase transformer and the former limit of described single-phase transformer is provided with circuit breaker and isolating switch;
Described cooling device is connected to lower the temperature with at least one in described three-phase transformer, described 3-phase power converter, described single-phase converter, described over-voltage protector, described high-pass filtering device and described single-phase transformer;
Described control cubicle is all connected with described 3-phase power converter, described single-phase converter, described over-voltage protector, described circuit breaker and described isolating switch, to control its operating state;
The power supply system of described three-phase high-voltage utility network is 110kV, 50Hz or 220kV, 50Hz; Described electric railway traction power supply network power supply system is 55kV, 50Hz or 27.5kV, 50Hz.
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| CN201510391657.XA CN104979827A (en) | 2015-07-06 | 2015-07-06 | Electrified railway power supply device and system thereof |
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| CN109733252A (en) * | 2019-01-07 | 2019-05-10 | 中国铁道科学研究院集团有限公司 | Ground automatic passing over of neutral section circuit and its control method, control device and control system |
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Application publication date: 20151014 |