CN103856039A - Power conversion device of power supply line network of trolley bus and power driving system - Google Patents
Power conversion device of power supply line network of trolley bus and power driving system Download PDFInfo
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- CN103856039A CN103856039A CN201410119875.3A CN201410119875A CN103856039A CN 103856039 A CN103856039 A CN 103856039A CN 201410119875 A CN201410119875 A CN 201410119875A CN 103856039 A CN103856039 A CN 103856039A
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Abstract
The invention discloses a power conversion device of a power supply line network of a trolley bus and a power driving system. The power conversion device comprises an electromagnetic interference filtering circuit which is connected with the power supply line network of the trolley bus and is used for filtering out electromagnetic interference in line network power supplied by the power supply line network of the trolley bus, a switch circuit which is connected with the output end positive electrode of the electromagnetic interference filtering circuit and is used for switching on or switching off the line network power, and a first filtering circuit which is connected between the switch circuit and a trolley bus load and is used for filtering the line network power and supplying the filtered line network power to the trolley bus load to drive the trolley bus load to run. The power conversion device can effectively purify an electromagnetic compatible environment of the trolley bus and alleviate fluctuation of the line network power; furthermore, power isolation between the line network power and vehicle-mounted power can be realized, so that the service life of a trolley bus motor is prolonged favorably; the speed regulation property of the trolley bus is improved, and the operation comfortability is enhanced; meanwhile, the safety of passengers and the trolley bus load is guaranteed.
Description
Technical field
The present invention relates to field of power electronics, specifically, relate to a kind of trolley wire network source conversion equipment and power drives system.
Background technology
Interurban is a kind ofly to provide the urban public traffic vehicles of electric energy by power supply gauze for each electricity consumption device of electric car inside, and two trolley heads of its current-collector by being arranged on roof obtain DC power supply from direct current gauze.
Fig. 1 shows the schematic diagram of existing trolley bus power drives system.As shown in Figure 1, the respective wire of two trolley head contact trolley wire nets of electric car current-collector, the DC power supply providing to receive gauze.This DC power supply outputs to the high-voltage load of electric car inside after by reactor L101, fuse F102, contactor J104 and fuse F105 circuit in series.Wherein, the high-voltage load of electric car comprises: for controlling the controller 106 of main drive motor M1, being the accessory power supply 107 of air pump motor M2 power supply, accessory power supply 108 for direction assist motor M3 power supply, 24V power transfer module 109, high-voltage charging machine 110, air-conditioning 111, heater 112, defroster 113 etc.In order to guarantee the fail safe of electric car, this system also includes lightning arrester F103, and one end of lightning arrester F103 is connected between fuse F102 and contactor J104, and the other end is connected with the negative pole of power supply gauze.
In addition, along with the development of battery technology, double source trolley bus is more and more applied, and Fig. 2 shows the schematic diagram of the power drives system of existing double source trolley bus.As shown in Figure 2, the power drives system of double source trolley bus has increased by one group of electrokinetic cell electric power system in parallel with gauze electric power system on the basis of the trolley bus power drives system shown in Fig. 1.The main device of electrokinetic cell electric power system is electrokinetic cell 215, the positive pole of electrokinetic cell 215 is connected with the input of fuse F105 by fuse F216, the contactor J217 circuit in series with diode D218, and negative pole is connected with the negative pole of power supply gauze with contactor J104 by contactor J217.
The gauze power supply that the power drives system of above-mentioned two kinds of trolley buses receives is all DC power supply of the specified 600V that obtained by transformation and uncontrollable rectification by three-phase main-frequency alternating current.When power supply gauze is electric car power supply, may there are many electric cars in the power supply gauze of 1～3 kilometer long simultaneously, and the power consumption of each electric car all can change in the scope of 0～220kW.
For example, in the time that electric car is braked, electric car is not from gauze power taking, and now the power consumption of electric car is 0.And electric car is while normally moving, the power consumption of electric car is 220kW.The variation of the power consumption of the electric car being connected with power supply gauze can cause the fluctuation of power supply gauze electric current.And the inductive effect that power supply gauze and feeder line exist can cause voltage concussion and fluctuation in the time of current fluctuation, and then cause gauze voltage to beat between 720V at 300V, the input voltage of the electric car being now connected with power supply gauze is also beated thereupon.In addition, there is the insulation joint of 10～20 centimetres in power supply gauze between different service areas, and the trolley head of trolley bus is when by insulation joint, and gauze supply power voltage just becomes 0V, so now the input voltage of trolley bus also exists the situation of acutely beating.
The voltage of direct-current input power supplying is beated on-board high-voltage load meeting is produced to a lot of harm.Vehicle-mounted accessory power supply in on-board high-voltage load and drive motor controller are to be made up of power electronic device such as contactor, electric capacity, insulated gate bipolar transistor convertor circuits, the voltage of beating can produce voltge surge and rush of current to these power electronic device, thereby has shortened the useful life of components and parts.Supply power voltage constant interval is excessive also can be demarcated and cause difficulty the working point of on-board high-voltage load, also can produce impact to the output of on-board high-voltage load, and then affects stand-by motor and normally work, thereby has shortened motor useful life.Gauze change in voltage cause the output speed of electric car drive motors and moment unstable, make car load speed adjusting performance variation, reduce driver's operation comfort, also bring potential safety hazard for electric car moves.
Meanwhile, because the power supply gauze of trolley bus is the overhead that is erected at urban road, the power supply gauze under this environment can be subject to a large amount of radio transmitting towers around, the electromagnetic interference of factory.And these electromagnetic interference can conduct in the electrical system of trolley bus by electrical network, it is severe that thereby the electromagnetic compatible environment that makes trolley bus becomes, affect the work of electric apparatus mounted on vehicle, the fault such as can cause that electric apparatus mounted on vehicle misoperation was even lost efficacy when serious interference.
Based on above-mentioned situation, need badly a kind of can be to the power supply change-over device of the DC power supply that trolley bus provides stable, reliable, electromagnetic interference is few.
Summary of the invention
For addressing the above problem, the invention provides a kind of trolley wire network source conversion equipment, described device comprises:
Electromagnetic interference filter circuit, it is connected with trolley wire net, the electromagnetic interference of the gauze power supply providing for trolley wire net described in filtering;
Switching circuit, it is connected with the output head anode of described electromagnetic interference filter circuit, for conducting or disconnect described gauze power supply;
The first filter circuit, it is connected between described switching circuit and electric car load, for described gauze power supply is carried out to filtering, and filtered gauze power supply is offered to described electric car load.
According to one embodiment of present invention, described electromagnetic interference filter circuit comprises three terminal capacitor.
According to one embodiment of present invention, described switching circuit comprises pre-charge circuit, described pre-charge circuit comprises the first resistance, the first contactor and the second contactor, and wherein said the first resistance and the first contactor circuit in series is in parallel with described the second contactor.
According to one embodiment of present invention, described the first filter circuit comprises LC filter circuit.
According to one embodiment of present invention, described device also comprises power isolation circuit, and it is connected between described the first filter circuit and electric car load, for described the first filter circuit and electric car load are carried out to isolated from power.
According to one embodiment of present invention, described power isolation circuit comprises:
Inverter circuit, its input is connected with described the first filter circuit, for the DC power supply of described the first filter circuit output is converted to the first AC power;
Isolating transformer, it is connected with described inverter circuit, for described the first AC power is converted to the second AC power, realizes the isolated from power between described the first AC power and the second AC power;
Rectification circuit, it is connected with described isolating transformer, for described the second AC power is converted to DC power supply, uses for described electric car load.
According to one embodiment of present invention, described inverter circuit comprises full bridge inverter.
According to one embodiment of present invention, described rectification circuit comprises diode rectifier circuit.
According to one embodiment of present invention, described device also comprises the second filter circuit, it is connected between described power isolation circuit and electric car load, and it carries out filtering for the DC power supply that described rectification circuit is exported, and filtered DC power supply is offered to described electric car load.
The present invention also provides a kind of electric car power drives system, and described system comprises:
Electric car load;
Power supply gauze, it is used to described electric car load that power supply is provided;
Power supply change-over device as above, it is connected between described electric car load and power supply gauze, exports to described electric car load, to drive described electric car load running for the gauze power supply that the described power supply gauze receiving is provided after processing.
The invention provides a kind of novel trolley wire network source conversion equipment, also provide a kind of electric car that uses this device to drive electrical system simultaneously.Gauze power supply change-over device provided by the invention carrys out filtering trolley wire net from radio transmitting tower, factory's electromagnetic radiation etc. receive electromagnetic interference around by electromagnetic interference filter circuit, can effectively purify the electromagnetic compatible environment of electric car, for the normal work of electric car provides safeguard.
Meanwhile, gauze power supply change-over device provided by the invention also reduces the constant interval of gauze voltage by switching circuit and filter circuit, can effectively improve the useful life of electric car motor, improves speed governing, the raising operational comfort of electric car.In addition, also come shielding wire network source and vehicle power by power isolation circuit, eliminated the potential safety hazard of car body electric leakage or electric discharge being brought because of gauze power supply, thereby provide guarantee for the safety of passenger and electric car load.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the present invention.Object of the present invention and other advantages can be realized and be obtained by specifically noted structure in specification, claims and accompanying drawing.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, will do simple introduction to needed accompanying drawing in embodiment or description of the Prior Art below:
Fig. 1 is the schematic diagram that existing single supply trolley bus drives electrical system;
Fig. 2 is the schematic diagram that existing duplicate supply trolley bus drives electrical system;
Fig. 3 be according to an embodiment of trolley wire network source conversion equipment of the present invention schematic diagram;
Fig. 4 be according to an embodiment of electric car power drives system of the present invention schematic diagram.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, to the present invention, how application technology means solve technical problem whereby, and the implementation procedure of reaching technique effect can fully understand and implement according to this.It should be noted that, only otherwise form conflict, each feature in each embodiment and each embodiment in the present invention can mutually combine, and the technical scheme forming is all within protection scope of the present invention.
Drive electrical system for the unconformable problem of gauze voltage fluctuation for existing trolley bus duplicate supply platform, the invention provides a kind of new trolley wire network source conversion equipment, Fig. 3 shows the schematic diagram of this device in the present embodiment.
As shown in Figure 3, in the present embodiment, trolley wire network source conversion equipment 300 comprises electromagnetic interference filter circuit 301, switching circuit 302 and the first filter circuit 303.
In the gauze power supply that trolley wire net provides, usually can there is the electromagnetic interference that the electromagnetic radiation from radio transmitting tower around, factory is introduced in a large number.Electromagnetic interference filter circuit 301 can the above-mentioned electromagnetic interference of filtering, and the quality of gauze power supply is improved, thereby reduces the impact of the electromagnetic environment on electric car load.In the present embodiment, electromagnetic interference filter circuit 301 comprises three terminal capacitor C3.As shown in Figure 3, the first port of three terminal capacitor C3 is connected with the positive pole of gauze power supply, the second port is connected with the negative pole of gauze power supply, the 3rd port is connected with ground, but the invention is not restricted to this, in other embodiments of the invention, electromagnetic interference filter circuit 301 can also adopt other reasonable circuit form.
From Fig. 3, find out, in the present embodiment, switching circuit 302 is connected between the output head anode of electromagnetic interference filter circuit 301 and the input anode of the first filter circuit 303, for come conducting or striping network source by the shutoff of self.In the present embodiment, switch element 302 is a pre-charge circuit, as shown in Figure 3, this pre-charge circuit comprises the first resistance R 1, the first contactor K1 and the second contactor K2, and wherein the first resistance R 1 and the first contactor K1 circuit in series is in parallel with the second contactor K2.
Pre-charge circuit not only can be realized the break-make to gauze power supply, also has route protection function.When the gauze power supply providing when trolley wire net exists by low voltage to the significantly saltus step of high voltage, first closed contactor K1 and disconnect contactor K2, when the voltage of electric car load-side and the pressure reduction of gauze voltage are less than after preset value, then disconnect contactor K1 and closed contactor K2.Because contactor K1 connects with resistance R 1, resistance R 1 can play metering function, excessive thereby the current fluctuation in protective circuit is unlikely to, and realizes the protection to load in circuit.
The first filter circuit 303 is connected between switching circuit 302 and electric car load, carries out filtering, and filtered power supply signal is offered to electric car load for the power supply signal that switching circuit 302 is exported.In the present embodiment, the first filter circuit 303 adopts LC filter circuit, comprise inductance L 1 and capacitor C 1, wherein, one end of inductance L 1 is connected with the output head anode of beginning circuit 302 as the input anode of the first filter circuit 303, the other end is connected with the input anode of electric car electric car load as the output head anode of the first filter circuit 303, and capacitor C 1 is connected in parallel between the input both positive and negative polarity of electric car load.
The power supply gauze of existing electric car mostly is three-phase main-frequency AC network, and the high potential existing between three-phase main-frequency AC network and the earth is poor, can make the direct current supply gauze of electric car also have higher electrical potential difference to the earth.If withstand voltage, the insulation measures of the high voltage component of trolley bus design unreasonable, or through work for a long time, the adverse circumstances such as rainwater, dust, salt fog easily cause failure of insulation, and gauze power supply can be to car body electric leakage or electric discharge, make to have potential safety hazard in the electrical system of trolley bus.And in passenger loading process, passenger steps on pin on the ground may produce electrical potential difference with contacting between the hand of car door or vehicle body, once failure of insulation far exceedes the voltage of safety standard, will cause the security incident that personnel get an electric shock.
Do not carry out isolated from power and the problem of potential safety hazard for trolley wire net and electric car load in above-mentioned existing electric car driving electrical system, as shown in Figure 3, in the present embodiment, trolley wire network source conversion transposition 300 also comprises power isolation circuit.And adopt the method that exchanges isolation for the isolation of high voltage source more, so in the present embodiment, power isolation circuit comprises inverter circuit 304, isolating transformer 305, rectification circuit 306.
The input of inverter circuit 304 is connected with the output of the first filter circuit 303, thereby is converted to the first AC power with the DC power supply that the first filter circuit 303 is exported.Isolating transformer 305 is connected with inverter circuit 304, and its first AC power that inverter circuit 304 can be exported is converted to the second AC power according to the turn ratio of self.Because between the primary coil of isolating transformer 303 and secondary coil not altogether, so can realize the isolated from power of the first AC power and the second AC power, thereby effectively guarantee the safety of passenger and electric car load.
Because what the power supply of electric car load adopted conventionally is DC power supply, is DC power supply, to be electric car load supplying so the second AC power that isolating transformer 305 produces also needs by rectification circuit 306 rectifications.
In the present embodiment, inverter circuit 304 adopts full bridge inverter, and rectification circuit 306 adopts diode bridge rectifier circuit, but the invention is not restricted to this, in other embodiments of the invention, inverter circuit 304 and rectification circuit 306 all can adopt other rational circuit form.
As shown in Figure 3, trolley wire network source conversion transposition 300 also comprises the second filter circuit 307, the second filter circuit 307 carries out filtering further for the DC power supply that rectification circuit 306 is produced, further to improve the DC power supply that outputs to electric car load.In the present embodiment, the second filter circuit 307 is identical with the circuit structure of the first filter circuit 303, does not repeat them here.It should be noted that, in other embodiments of the invention, the second filter circuit can also adopt other rational circuit form, the invention is not restricted to this simultaneously.
The present invention also provides a kind of electric car power drives system, and Fig. 4 shows the schematic diagram of this system.
As shown in Figure 4, electric car drives electrical system to comprise power supply gauze 401, trolley wire network source conversion transposition 300 and electric car load 402.Wherein, trolley wire network source conversion equipment 300 is connected with the power supply gauze 401 of electric car, process for the gauze power supply that the power supply gauze 401 receiving is provided, and gauze power supply after treatment is exported to electric car load 402, to provide the power supply after filtering and isolated from power for electric car load 402.
In the present embodiment, electric car drives electrical system also to comprise protective circuit 403, and it is connected between trolley wire net and supply lines network source conversion equipment 300, is used to supply lines network source conversion equipment 300 and electric car load 402 that protection is provided.
As shown in Figure 4, in the present embodiment, protective circuit 403 comprises reactor L101, fuse F102 and lightning arrester F103.Wherein, reactor L101 and fuse F102 are connected between the positive pole of supply lines network source and the input anode of supply lines network source conversion equipment 300; in the time that the electric current in supply lines network source output loop is excessive; protective circuit 403 can disconnect being connected between power supply gauze and supply lines network source conversion equipment 300, thus reach to power supply change-over device 300 with and the protection of the electric car load 402 of connection.Lightning arrester F103 is connected in parallel between the input both positive and negative polarity of supply lines network source conversion equipment 300, can make power supply change-over device 300 and electric car load 402 avoid lightning overvoltage or switching overvoltage infringement.In order further electric car load 402 to be carried out to overcurrent protection; in the present embodiment; between power supply change-over device 300 and electric car load 402, be also serially connected with fuse F105; in the time that the electric current flowing through in electric car load 402 is excessive; fuse F105 fusing; thereby being connected between deenergization conversion transposition 300 and electric car load 402, reach the object of electric car load being carried out to overcurrent protection.
The invention provides a kind of novel trolley wire network source conversion equipment, a kind of electric car power drives system that uses this device is also provided simultaneously, gauze power supply change-over device provided by the invention carrys out filtering trolley wire net from radio transmitting tower, factory's electromagnetic radiation receive electromagnetic interference around by electromagnetic interference filter circuit, can effectively purify the electromagnetic compatible environment of electric car, for the normal work of electric car provides safeguard.Meanwhile, gauze power supply change-over device provided by the invention also reduces the amplitude of variation of gauze voltage by switching circuit and filter circuit, can effectively improve the useful life of electric car motor, improves speed governing, the raising operational comfort of electric car.In addition, also come shielding wire network source and vehicle power by power isolation circuit, eliminated because gauze power supply is to car body electric leakage or the potential safety hazard of bringing of discharging, guaranteed electric car load and passenger's safety.
Although the disclosed execution mode of the present invention as above, the execution mode that described content just adopts for the ease of understanding the present invention, not in order to limit the present invention.Technical staff in any the technical field of the invention; do not departing under the prerequisite of the disclosed spirit and scope of the present invention; can do any modification and variation what implement in form and in details; but scope of patent protection of the present invention, still must be as the criterion with the scope that appending claims was defined.
Claims (10)
1. a trolley wire network source conversion equipment, is characterized in that, comprising:
Electromagnetic interference filter circuit, it is connected with trolley wire net, the electromagnetic interference of the gauze power supply providing for trolley wire net described in filtering;
Switching circuit, it is connected with the output head anode of described electromagnetic interference filter circuit, for conducting or disconnect described gauze power supply;
The first filter circuit, it is connected between described switching circuit and electric car load, for described gauze power supply is carried out to filtering, and filtered gauze power supply is offered to described electric car load.
2. device as claimed in claim 1, is characterized in that, described electromagnetic interference filter circuit comprises three terminal capacitor.
3. device as claimed in claim 1 or 2, it is characterized in that, described switching circuit comprises pre-charge circuit, described pre-charge circuit comprises the first resistance, the first contactor and the second contactor, and wherein said the first resistance and the first contactor circuit in series is in parallel with described the second contactor.
4. the device as described in claim 1 or 2 or 3, is characterized in that, described the first filter circuit comprises LC filter circuit.
5. the device as described in any one in claim 1～4, is characterized in that, described device also comprises power isolation circuit, and it is connected between described the first filter circuit and electric car load, for described the first filter circuit and electric car load are carried out to isolated from power.
6. device as claimed in claim 5, is characterized in that, described power isolation circuit comprises:
Inverter circuit, its input is connected with described the first filter circuit, for the DC power supply of described the first filter circuit output is converted to the first AC power;
Isolating transformer, it is connected with described inverter circuit, for described the first AC power is converted to the second AC power, realizes the isolated from power between described the first AC power and the second AC power;
Rectification circuit, it is connected with described isolating transformer, for described the second AC power is converted to DC power supply, uses for described electric car load.
7. device as claimed in claim 6, is characterized in that, described inverter circuit comprises full bridge inverter.
8. the device as described in claim 6 or 7, is characterized in that, described rectification circuit comprises diode rectifier circuit.
9. the device as described in any one in claim 6～8, it is characterized in that, described device also comprises the second filter circuit, it is connected between described power isolation circuit and electric car load, it carries out filtering for the DC power supply that described rectification circuit is exported, and filtered DC power supply is offered to described electric car load.
10. an electric car power drives system, is characterized in that, described system comprises:
Electric car load;
Power supply gauze, it is used to described electric car load that power supply is provided;
Power supply change-over device as described in any one in claim 1～9, it is connected between described electric car load and power supply gauze, after processing for the gauze power supply that the described power supply gauze receiving is provided, export to described electric car load, to drive described electric car load running.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410119875.3A CN103856039A (en) | 2014-03-27 | 2014-03-27 | Power conversion device of power supply line network of trolley bus and power driving system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410119875.3A CN103856039A (en) | 2014-03-27 | 2014-03-27 | Power conversion device of power supply line network of trolley bus and power driving system |
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| CN201410119875.3A Pending CN103856039A (en) | 2014-03-27 | 2014-03-27 | Power conversion device of power supply line network of trolley bus and power driving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109347189A (en) * | 2015-12-04 | 2019-02-15 | 郑州宇通客车股份有限公司 | A kind of power supply system for trolley bus and its method for controlling power supply |
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Application publication date: 20140611 |