CN203995757U - A kind of low pressure inversion feedback type traction electric power system - Google Patents
A kind of low pressure inversion feedback type traction electric power system Download PDFInfo
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- CN203995757U CN203995757U CN201420385391.9U CN201420385391U CN203995757U CN 203995757 U CN203995757 U CN 203995757U CN 201420385391 U CN201420385391 U CN 201420385391U CN 203995757 U CN203995757 U CN 203995757U
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Abstract
本实用新型涉及一种低压逆变回馈式牵引供电系统，该低压逆变回馈式牵引供电系统由交流供电网、牵引变压器、不控整流器、直流牵引网、配电变压器、站内辅助用电设备、能量回馈逆变器组成；因此本实用新型通过在直流牵引网和配电变压器低压侧之间设置一个能量回馈逆变器，实现了直流牵引网侧的有功电能向配电变压器低压侧的流动，能够抑制列车再生制动过程中直流牵引网电压的升高，保障了牵引供电系统及列车运行的安全可靠；能够将多余的再生制动能量供给站内辅助用电设备使用，提高了再生制动能量的利用率，达到了降低城市轨道交通运营成本和节能环保的目的。
The utility model relates to a low-voltage inverter feedback traction power supply system. The low-voltage inverter feedback traction power supply system consists of an AC power supply network, a traction transformer, an uncontrolled rectifier, a DC traction network, a power distribution transformer, auxiliary electrical equipment in a station, The utility model is composed of an energy feedback inverter; therefore, the utility model realizes the flow of active electric energy from the DC traction network side to the low-voltage side of the distribution transformer by setting an energy feedback inverter between the DC traction network and the low-voltage side of the distribution transformer. It can suppress the voltage increase of the DC traction network during the regenerative braking process of the train, ensuring the safety and reliability of the traction power supply system and train operation; it can supply the redundant regenerative braking energy to the auxiliary electrical equipment in the station, which improves the regenerative braking energy The utilization rate has achieved the purpose of reducing the operating cost of urban rail transit and energy saving and environmental protection.
Description
Technical field
The utility model belongs to urban rail transit technology field, relates in particular to a kind of low pressure inversion feedback type traction electric power system.
Background technology
At present, urban track traffic becomes a metropolitan transport hub of modernization day by day, is bearing daily main traffic transportation.Along with the develop rapidly in city, the demand of urban track traffic is also promoted day by day, require its have safety, on schedule, at a high speed, the characteristic such as quick.City railway train be take electric traction as main, and because its traffic coverage is shorter, train starting braking is frequent, and traditional train braking technology relies on brake shoe mechanical braking, has wasted a large amount of kinetic energy in braking procedure.In recent years, along with the application of Regenerative Braking Technology, the capacity usage ratio of urban track traffic has obtained very large lifting, and the problem of also having brought traction net DC bus-bar voltage to raise simultaneously, must adopt corresponding technology to suppress the rising of DC bus-bar voltage.
Document " a kind of High Power Factor high performance-price ratio can be presented formula tractive power supply system " (publication number CN102328601A) has disclosed a kind ofly can present formula tractive power supply system, and this system comprises: Bulk Supply Substation, middle pressure ring net, first to N can be presented formula traction substation, direct current contact system and rail.Formula traction substation be can present and a set of 12 pulse wave rectifier units and the parallel connection of a set of PWM rectifier unit adopted, both utilized the advantage that diode rectification unit is simple and reliable, cheap, overload capacity is strong, realized again the two-way flow of energy, train braking energy back can be returned to AC network, save electric energy; In addition, utilize PWM rectifier unit to inject certain perception and capacitive reactive power to middle pressure ring net, can improve Bulk Supply Substation and exchange point of incoming cables power factor.But this system need to adopt the PWM rectifier unit of high voltage large capcity, increased technical risk and the cost of system; And, for decentralized power-supply system, Bulk Supply Substation is not set, power supply of urban orbit traffic is taken from local transmission network medium voltage side along the line, PWM rectifier unit and medium voltage side are connected, and to medium voltage side, inject unnecessary regenerating braking energy, the problem that can bring electric energy to send; And if control method is improper, PWM rectifier unit can be brought harmonic pollution to medium voltage side, affects the quality of power supply of whole medium-pressure electricity supply system.
Utility model content
The complicated operation that the utility model adopts high voltage large capcity PWM rectifier unit to exist for solving existing tractive power supply system, cost is higher, easily produces the problem that electric energy send and a kind of simple in structure, easy to install, low pressure inversion feedback type traction electric power system of increasing work efficiency is provided.
The technical scheme that the utility model is taked for the technical matters existing in solution known technology is:
The low pressure inversion feedback type traction electric power system of the utility model embodiment, this low pressure inversion feedback type traction electric power system by Alternating Current Power Supply net, traction transformer, not control rectifier, DC Traction Network, distribution transformer, stand in auxiliary consumer, energy feedback inverting device form;
Be connected with Alternating Current Power Supply net for the alternating current of Alternating Current Power Supply net being transformed into direct current and being the traction transformer of the train traction power supply in DC Traction Network and control rectifier not, be connected with control rectifier not the DC Traction Network that is used to train power supply, the distribution transformer that is low pressure by the medium voltage transformation in Alternating Current Power Supply net, be connected with distribution transformer and accept auxiliary consumer in the station of distribution transformer power supply, be connected with DC Traction Network with distribution transformer the unnecessary regenerating braking energy inversion in DC Traction Network is arrived to the AC low-tension side of distribution transformer and supplied to assist in station the energy feedback inverting device of consumer electricity consumption.
The utility model can also adopt following technical measures:
In embodiment of the present utility model, energy feedback inverting device is that a PWM is controlled inverter entirely, is connected between the DC bus side of DC Traction Network and the AC low-tension side of distribution transformer.
Further, Alternating Current Power Supply net is taken from urban power distribution network or is powered by City Rail Transit System special line.
Further, traction transformer converts the power supply voltage of local transmission network to the not applicable commutating voltage grade of control rectifier, realizes phase shift and electrical isolation simultaneously.
Further, control rectifier does not consist of thyristor.
Further, DC Traction Network has contact system power supply and two kinds of power supply modes of the 3rd rail power supply.
Further, distribution transformer is low pressure by the medium voltage transformation in Alternating Current Power Supply net, is the interior auxiliary consumer power supply of standing.
Further, stand in auxiliary consumer comprise illumination, elevator, air-conditioning and ventilating set.
Further, energy feedback inverting device has three kinds of mode of operations, is respectively reactive-load compensation, feed-back compensation, meritorious three kinds of patterns of feedback.
Further, energy feedback inverting device is by power circuit and composition of the control system; The two level structures that power circuit adopts full control binistor IGBT to form; Two closed loop controlling structures that control system adopts the voltage and current double closed-loop PI based on triangular carrier comparison to control.
Advantage and the good effect that the utlity model has are: because the utility model by arranging an energy feedback inverting device between DC Traction Network and distribution transformer low pressure side, realized active energy the flowing to distribution transformer low pressure side of DC Traction Network side, can suppress the rising of DC Traction Network voltage in train process of regenerative braking, ensure the safe and reliable of tractive power supply system and train operation; Auxiliary consumer in unnecessary regenerating braking energy supply station can be used, improve the degree of utilization of regenerating braking energy, reach the object that reduces urban track traffic operation cost and energy-conserving and environment-protective.The direct screening voltage class of energy feedback inverting device of the present utility model is lower, also lower to the requirement of inverter system, without special connection transformer; The flow direction of regenerating braking energy is simple, and electric energy can not send to electrical network, only for auxiliary consumer in station; In conjunction with corresponding control methods, except carrying out the feedback of regenerating braking energy, can also carry out certain reactive-load compensation to the interior auxiliary consumer of standing, further improve the whole electricity consumption situation of City Rail Transit System.The utility model meets the requirement of energy-conserving and environment-protective and low-carbon economy, significant for the operation level, the propelling Construction of Urban Rail Traffic that improve urban track traffic.
Accompanying drawing explanation
Fig. 1 is the low pressure inversion feedback type traction electric power system structural representation that the utility model embodiment provides;
In figure: 1, Alternating Current Power Supply net; 2, traction transformer; 3, control rectifier not; 4, DC Traction Network; 5, distribution transformer; 6, stand in auxiliary consumer; 7, energy feedback inverting device;
Fig. 2 is the energy feedback inverting device control principle drawing that the utility model embodiment provides.
The specific embodiment
For further understanding utility model content of the present utility model, Characteristic, hereby exemplify following examples, and coordinate accompanying drawing to be described in detail as follows: the utility model software module used or unit all belong to known module or unit, when buying hardware module or unit, this software module or unit have been installed.There is not the innovation of software or method in the utility model.
Refer to Fig. 1:
As shown in Figure 1, the low pressure inversion feedback type traction electric power system of the utility model embodiment mainly by: Alternating Current Power Supply net 1, traction transformer 2, control rectifier 3, DC Traction Network 4, distribution transformer 5, stand in auxiliary consumer 6, energy feedback inverting device 7 do not form;
Be connected with Alternating Current Power Supply net 1 for the alternating current of Alternating Current Power Supply net being transformed into direct current and being the traction transformer 2 of the train traction power supply in DC Traction Network and control rectifier 3 not, be connected with control rectifier 3 not the DC Traction Network 4 that is used to train power supply, the distribution transformer 5 that is low pressure by the medium voltage transformation in Alternating Current Power Supply net 1, be connected with distribution transformer 5 and accept auxiliary consumer 6 in the station of distribution transformer 5 power supply, be connected with DC Traction Network 4 with distribution transformer 5 the unnecessary regenerating braking energy inversion in DC Traction Network 4 is arrived to the AC low-tension side of distribution transformer 5 and supplied to assist in station the energy feedback inverting device 7 of consumer 6 electricity consumptions.
In embodiment of the present utility model, between Alternating Current Power Supply net 1 and DC Traction Network 4, by traction transformer 2, be connected with control rectifier 3 not, Alternating Current Power Supply net 1 is connected by distribution transformer with interior the assisting between consumer 6 in station, energy feedback inverting device 7 is actually a PWM and entirely controls inverter, is connected between the DC bus side of DC Traction Network 4 and the AC low-tension side of distribution transformer 5.
Alternating Current Power Supply net 1 can be taken from urban power distribution network, also can be powered by City Rail Transit System special line, is Electro-metering point and the quality of power supply examination point of City Rail Transit System and electric company herein.Flow of electrical power herein should be unidirectional, by Alternating Current Power Supply net to City Rail Transit System, and should there is not sending of electric energy, otherwise can cause two-way charging.Power factor herein and harmonic content all should meet the performance assessment criteria of power supply unit.
Traction transformer 2 converts the power supply voltage of Alternating Current Power Supply net to the not applicable commutating voltage grade of control rectifier 3, can also realize the effect of phase shift and electrical isolation simultaneously.Control rectifier 3 does not consist of thyristor.Conventional have 12 pulse waves not control rectification and 24 pulse waves are not controlled rectification.It is to consist of 30 ° of two groups of three-phase full-bridge rectifiers also phase shifts in parallel that 12 pulse waves are not controlled rectification.Typical 24 pulse waves not control rectifier are not controlled 15 ° of the in parallel and phase shifts of rectification by two group of 12 pulse wave and are formed.
DC Traction Network 4, for train provides DC traction power, has contact system power supply and two kinds of power supply modes of the 3rd rail power supply.When train carries out regenerative brake, the traction electric machine of train, in electrical generator operating mode, is converted into electric energy feedback to DC Traction Network by braking energy, can be other train traction power supplies in the same power supply section of DC Traction Network.When this part energy cannot be absorbed in time, the rising that can cause drawing net voltage, threatens to the safe operation of traction net and train.
Distribution transformer 5 is low pressure by the medium voltage transformation in Alternating Current Power Supply net 1, is interior auxiliary consumer 6 power supplies of standing.
In standing, auxiliary consumer 6 comprises illumination, elevator, air-conditioning and ventilating set etc.
Principle of work of the present utility model:
The utility model is by Alternating Current Power Supply net, traction transformer, auxiliary consumer forms in control rectifier, DC Traction Network, energy feedback inverting device, distribution transformer and station.Between Alternating Current Power Supply net and DC Traction Network, by traction transformer, be connected with control rectifier not, Alternating Current Power Supply net is connected by distribution transformer with interior the assisting between consumer in station, energy feedback inverting device is actually a PWM and entirely controls inverter, is connected between the DC bus side of DC Traction Network and the AC low-tension side of distribution transformer; Wherein, traction transformer and not control rectifier are transformed into direct current by the alternating current in Alternating Current Power Supply net, are the train traction power supply in DC Traction Network.
Distribution transformer is low pressure by the medium voltage transformation in Alternating Current Power Supply net, is the interior auxiliary consumer power supply of standing, and in standing, auxiliary consumer comprises illumination, elevator, air-conditioning and ventilating set etc.
When train carries out regenerative brake, braking energy is converted into electric energy, feeds back in DC Traction Network, when the unnecessary regenerating braking energy in DC Traction Network cannot be absorbed in time, can cause drawing net voltage and raise.
When DC Traction Network voltage raises, energy feedback inverting device starts, and the AC low-tension side by the unnecessary regenerating braking energy inversion in DC Traction Network to distribution transformer, for auxiliary consumer electricity consumption in station.
Coordinate relevant control policy, energy feedback inverting device can also carry out reactive-load compensation compensation to the interior auxiliary consumer of standing.
Refer to Fig. 2:
Energy feedback inverting device is mainly by power circuit and composition of the control system.
The two level structures that power circuit adopts full control binistor IGBT to form.
Control system adopts the voltage and current double closed-loop PI control method based on triangular carrier comparison.I
qrefit is the energy feedback inverting device output referenced reactive current value being calculated by reactive current detection method, concrete grammar is that distribution transformer low pressure side electric current is detected, detected value is carried out to abc/dq conversion, get its wattless component, as the command value of energy feedback inverting device output reactive component of current, to realize the full compensation to distribution transformer low pressure side.I
drefbe the energy feedback inverting device active current command value of being exported by DC bus-bar voltage control loop, the control by energy feedback inverting device output active current, realizes u
dcthe voltage u of trace command
dcrefthereby, reach the object of DC-side Voltage Stabilization.This is typical two closed loop controlling structures, and it is a steady state value that outer voltage is controlled DC bus side voltage, and current inner loop is controlled energy feedback inverting device AC outgoing current and followed the tracks of the variation of its command value.
Energy feedback inverting device has three kinds of mode of operations, is respectively three kinds of patterns such as reactive-load compensation (pattern one), feed-back compensation (pattern two), meritorious feedback (pattern three).In order to realize three kinds of mode of operations of energy feedback inverting device, set DC bus-bar voltage u
dcnormal value, low limit value and ceiling value scope.
To DC bus-bar voltage u
dcdetect in real time, when it is during in normal value, energy feedback inverting device is in pattern one, referenced reactive current value i
qreffor the value that above-mentioned reactive current detection method calculates, energy feedback inverting device output reactive-load track referenced reactive current value i
qref, meanwhile, active current command value i
drefbe zero, the transmission of not gaining merit of energy feedback inverting device, only carries out reactive-load compensation to the interior auxiliary consumer of standing.
When DC bus-bar voltage surpasses low limit value, energy feedback inverting device enters pattern two, referenced reactive current value i
qreffor the value that above-mentioned reactive current detection method calculates, energy feedback inverting device output reactive-load track referenced reactive current value i
qref, meanwhile, active current command value i
drefby outer voltage, produced the meritorious active current command value i that follows the tracks of of energy feedback inverting device output
dref, the transmission of gaining merit, can either feed back to distribution transformer low pressure side by the excess energy inversion of DC Traction Network side, can carry out reactive-load compensation to the interior auxiliary consumer of standing again.
When DC bus side voltage surpasses ceiling value, referenced reactive current value i is set
qrefbe zero, the output of energy feedback inverting device is idle is zero, and no-power compensation function exits, meanwhile, and active current command value i
drefby outer voltage, produced the meritorious active current command value i that follows the tracks of of energy feedback inverting device output
dref, the transmission of gaining merit, the All Told Measurement of energy feedback inverting device is all used for carrying out the meritorious inversion feedback in DC Traction Network, in the hope of suppressing rapidly to the full extent the rising of DC Traction Network voltage.
Specific embodiment of the utility model:
Low pressure inversion feedback type traction electric power system of the present utility model, as shown in Figure 1, by Alternating Current Power Supply net 1, traction transformer 2, control rectifier 3, DC Traction Network 4, distribution transformer 5, stand in auxiliary consumer 6, energy feedback inverting device 7 do not form.Between Alternating Current Power Supply net and DC Traction Network, by traction transformer, be connected with control rectifier not, in Alternating Current Power Supply net and station, between auxiliary consumer, by distribution transformer, connect, energy feedback inverting device is connected between the DC bus and distribution transformer low pressure side of DC Traction Network.
Alternating Current Power Supply net can be taken from urban power distribution network, also can be powered by City Rail Transit System special line, is Electro-metering point and the quality of power supply examination point of City Rail Transit System and electric company herein.Flow of electrical power herein should be unidirectional, by Alternating Current Power Supply net to City Rail Transit System, and should there is not sending of electric energy, otherwise can cause two-way charging.Power factor herein and harmonic content all should meet the performance assessment criteria of power supply unit.
Traction transformer converts the power supply voltage of local transmission network to the not applicable commutating voltage grade of control rectifier, can also realize the effect of phase shift and electrical isolation simultaneously.Control rectifier does not consist of thyristor.Conventional have 12 pulse waves not control rectification and 24 pulse waves are not controlled rectification.It is to consist of 30 ° of two groups of three-phase full-bridge rectifiers also phase shifts in parallel that 12 pulse waves are not controlled rectification.Typical 24 pulse waves not control rectifier are not controlled 15 ° of the in parallel and phase shifts of rectification by two group of 12 pulse wave and are formed.
DC Traction Network, for train provides DC traction power, has contact system power supply and two kinds of power supply modes of the 3rd rail power supply.When train carries out regenerative brake, the traction electric machine of train, in electrical generator operating mode, is converted into electric energy feedback to DC Traction Network by braking energy, can be other train traction power supplies in the same power supply section of DC Traction Network.When this part energy cannot be absorbed in time, the rising that can cause drawing net voltage, threatens to the safe operation of traction net and train.
Energy feedback inverting device can be reverse into alternating current by regenerating braking energy unnecessary in DC Traction Network, feeds back to distribution transformer low pressure side, is the interior auxiliary consumer power supply of standing.The power circuit of energy feedback inverting device forms by entirely controlling binistor, in conjunction with relevant control strategy, can realize meritorious inversion and no-power compensation function, and be equipped with corresponding protection system, test macro, operation interface and alarm function.
Treating process of the present utility model is as follows:
1, DC Traction Network voltage is in normal value, and energy feedback inverting device works in reactive-load compensation pattern (pattern one), only the interior auxiliary consumer of standing is carried out to reactive-load compensation.
2, when detecting DC bus-bar voltage, energy feedback inverting device rises, surpass after low limit value, enter feed-back compensation pattern (pattern two), send pattern two alarms simultaneously, drop into meritorious invert function, the meritorious inversion of DC Traction Network side is fed back to distribution transformer low pressure side, continue the interior auxiliary consumer of standing to carry out reactive-load compensation simultaneously.When DC bus-bar voltage being detected, be reduced to normal value when following, by pattern two, enter pattern one.
3, when detecting DC bus-bar voltage, energy feedback inverting device rises, surpass after ceiling value, enter inversion feedback pattern (pattern three), send pattern three alarms simultaneously, only drop into inversion feedback function, exit no-power compensation function, the All Told Measurement of energy feedback inverting device is used for carrying out inversion feedback, in the hope of suppressing rapidly to the full extent the rising of DC bus-bar voltage.When DC bus-bar voltage being detected, drop to normal value when following, by pattern three, enter pattern one.
The utility model by arranging an energy feedback inverting device between DC Traction Network and distribution transformer low pressure side, realized active energy the flowing to distribution transformer low pressure side of DC Traction Network side, on the one hand, can suppress the rising of DC Traction Network voltage in train process of regenerative braking, ensure the safe and reliable of tractive power supply system and train operation; On the other hand, auxiliary consumer in unnecessary regenerating braking energy supply station can be used, improve the degree of utilization of regenerating braking energy, reach the object that reduces urban track traffic operation cost and energy-conserving and environment-protective.The direct screening voltage class of energy feedback inverting device is lower, also lower to the requirement of inverter system, without special connection transformer; The flow direction of regenerating braking energy is simple, and electric energy can not send to electrical network, only for auxiliary consumer in station; In conjunction with corresponding control methods, except carrying out the feedback of regenerating braking energy, can also carry out certain reactive-load compensation to the interior auxiliary consumer of standing, further improve the whole electricity consumption situation of City Rail Transit System.The present invention meets the requirement of energy-conserving and environment-protective and low-carbon economy, significant for the operation level, the propelling Construction of Urban Rail Traffic that improve urban track traffic.
The above is only to preferred embodiment of the present utility model, not the utility model is done to any pro forma restriction, every foundation technical spirit of the present utility model is to any simple modification made for any of the above embodiments, equivalent variations and modification, all belong in the scope of technical solutions of the utility model.
Claims (10)
1. a low pressure inversion feedback type traction electric power system, it is characterized in that, this low pressure inversion feedback type traction electric power system by Alternating Current Power Supply net, traction transformer, not control rectifier, DC Traction Network, distribution transformer, stand in auxiliary consumer, energy feedback inverting device form;
Be connected with Alternating Current Power Supply net for the alternating current of Alternating Current Power Supply net being transformed into direct current and being the traction transformer of the train traction power supply in DC Traction Network and control rectifier not, be connected with control rectifier not the DC Traction Network that is used to train power supply, the distribution transformer that is low pressure by the medium voltage transformation in Alternating Current Power Supply net, be connected with distribution transformer and accept auxiliary consumer in the station of distribution transformer power supply, be connected with DC Traction Network with distribution transformer the unnecessary regenerating braking energy inversion in DC Traction Network is arrived to the AC low-tension side of distribution transformer and supplied to assist in station the energy feedback inverting device of consumer electricity consumption.
2. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, energy feedback inverting device is that a PWM is controlled inverter entirely, is connected between the DC bus side of DC Traction Network and the AC low-tension side of distribution transformer.
3. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, Alternating Current Power Supply net is taken from urban power distribution network or powered by City Rail Transit System special line.
4. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, traction transformer converts the power supply voltage of local transmission network to the not applicable commutating voltage grade of control rectifier, realizes phase shift and electrical isolation simultaneously.
5. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, control rectifier does not consist of thyristor.
6. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, DC Traction Network has contact system power supply and two kinds of power supply modes of the 3rd rail power supply.
7. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, distribution transformer is low pressure by the medium voltage transformation in Alternating Current Power Supply net, is the interior auxiliary consumer power supply of standing.
8. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, in standing, auxiliary consumer comprises illumination, elevator, air-conditioning and ventilating set.
9. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, energy feedback inverting device has three kinds of mode of operations, is respectively reactive-load compensation, feed-back compensation, meritorious three kinds of patterns of feedback.
10. low pressure inversion feedback type traction electric power system as claimed in claim 1, is characterized in that, energy feedback inverting device is by power circuit and composition of the control system; The two level structures that power circuit adopts full control binistor IGBT to form; Two closed loop controlling structures that control system adopts the voltage and current double closed-loop PI based on triangular carrier comparison to control.
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| CN106019068A (en) * | 2016-06-20 | 2016-10-12 | 北京交通大学 | Network voltage interruption detection and control method for multi-unit train network side converter |
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| CN106099978A (en) * | 2016-07-07 | 2016-11-09 | 许继集团有限公司 | Metro braking energy back feed device, control method for reactive-load compensation |
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| CN111347941B (en) * | 2018-12-20 | 2022-03-18 | 比亚迪股份有限公司 | Auxiliary power supply system for railway vehicle and control method thereof |
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| CN110126667B (en) * | 2019-04-19 | 2021-11-12 | 南京南瑞继保电气有限公司 | Working mode switching method of locomotive energy feedback device |
| CN110435485A (en) * | 2019-07-08 | 2019-11-12 | 许继集团有限公司 | A kind of progress control method, device and medium applied to inversion feedback device |
| CN113511113A (en) * | 2020-04-10 | 2021-10-19 | 利思电气（上海）有限公司 | Bidirectional traction rectifying device for urban rail transit |
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Address after: 300010 Tianjin city Hebei District Wujing Road No. 39 Patentee after: State Grid Corporation of China Patentee after: STATE GRID TIANJIN ELECTRIC POWER Co. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Patentee before: State Grid Corporation of China Patentee before: STATE GRID TIANJIN ELECTRIC POWER Co. |
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