CN212555848U - Dual power supply overhead line converter system for electric wheel off-highway vehicle - Google Patents

Abstract

The utility model relates to a dual supply overhead line converter system for electronic round of off-highway vehicle, this system includes: the alternating current input side of the main converter is connected with a generator of a vehicle, the output side of the main converter is connected with two traction motors of the vehicle, the input side of the overhead line cabinet is connected with a power grid through a pantograph, and the output side of the overhead line cabinet is connected with the main converter to input electric energy for the main converter. Alternating current output by the main generator is converted into stable direct current after being rectified and inverted by the main converter and is used as input current of a connected traction motor, the direct current side is connected to a power grid through the wiring cabinet, and the power grid voltage is connected to the direct current side of the converter after passing through a filter circuit of the wiring cabinet to supply power to the direct current side. By adopting the converter system, a dual-energy solution is provided for the off-highway vehicle, the problems of low operation efficiency, high implementation cost and the like in the prior art can be solved, and the operation efficiency of the application vehicle is improved on the premise of reducing the mining cost of the mine car in multiple dimensions.

Description

Dual power supply overhead line converter system for electric wheel off-highway vehicle

Technical Field

The utility model relates to a topological technical field of converter circuit especially relates to a dual supply overhead line converter system for electronic round of non-highway vehicle.

Background

In the field of electric drive systems of the existing electric wheel mine cars, the electric wheel mine car which is running at present mostly adopts a single power supply overhead line circuit, a diesel engine drives a generator to supply power to a converter, and the diesel engine adopted by the electric wheel mine car directly adopts a generator drive technology, so that the following defects exist:

1) the power of the diesel engine is limited, the heavy load uphill speed is low, the production efficiency is seriously influenced, and the fuel consumption is large.

2) The price of the diesel oil is greatly increased, so that the transportation cost per ton is greatly increased, and the operation cost of the electric wheel dumper is greatly increased.

3) The emissions from diesel engines can cause severe air pollution.

4) When the vehicle runs downhill, all braking energy is consumed by the braking resistor, and the braking energy cannot be recovered, so that waste is caused.

Further, as disclosed in chinese patent CN201410570269.3 "stringing system for electric wheel off-highway dump truck", the system is a dual power solution for electric wheel mining vehicle, which describes a stringing system and a stringing method thereof, and does not provide related descriptions of stringing circuit and converter. Chinese patent CN201310570828.6, "an auxiliary device for stringing an electric power system", discloses an auxiliary device for stringing an electric power system, which comprises a driving device for the auxiliary device for stringing an electric power system, a locking mechanism for the auxiliary device for stringing an electric power system, a gear shaft for the auxiliary device for stringing an electric power system, and a positioning mechanism for the auxiliary device for stringing an electric power system; the locking mechanism of the power system stringing auxiliary device is fixedly or movably connected with the driving device of the power system stringing auxiliary device, and the positioning mechanism of the power system stringing auxiliary device is fixedly or movably connected with the driving device of the power system stringing auxiliary device through the gear shaft of the power system stringing auxiliary device.

SUMMERY OF THE UTILITY MODEL

To the above problem, the utility model provides a dual power overhead line converter system for electronic round of off-highway vehicle, this system adopt dual power overhead line main circuit structure, and is concrete, and this system includes:

the alternating current input side of the main converter is connected with a generator of the vehicle, and the output side of the main converter is connected with two traction motors of the vehicle; and

and the input side of the stringing cabinet is connected with a power grid through a pantograph, and the output side of the stringing cabinet is connected with the main converter and is used for inputting electric energy to the main converter.

Preferably, the main converter comprises:

a rectifying unit connected to an output side of the vehicle generator, and converting alternating current from the generator into direct current;

the input ends of the first inversion unit and the second inversion unit are connected with the output end of the rectification unit, the output ends of the two inversion units are respectively connected to two traction motors of the vehicle, and direct current output by the rectification unit is converted into alternating current with adjustable frequency and amplitude to drive the traction motors of the vehicle;

the two inversion units are respectively packaged with two capacitors, the four capacitors are connected in parallel to form a filtering loop and an energy storage branch circuit, and the filtering loop filters current transmitted to a vehicle traction motor and receives feedback voltage from the traction motor under the condition of vehicle braking.

In one embodiment, the overhead line cabinet comprises:

a contactor for controlling the input and cut-off of the network voltage;

and the filtering unit is connected between the contactor and the main converter and is used for filtering the direct current transmitted to the main converter.

In one embodiment, the main converter further comprises:

and the intermediate voltage discharge loop is provided with two discharge resistors which are connected in series to the positive busbar and the negative busbar, and the direct-current voltage is discharged through the discharge resistors under the abnormal power-off condition.

In one embodiment, the main converter further comprises:

and one end of the high-voltage indicating unit is connected with the output end of the filtering unit and the output end of the rectifying unit in the overhead line cabinet, and the other end of the high-voltage indicating unit is connected with the input end of the intermediate voltage discharging loop.

Further, the rectifying unit of the main converter adopts a diode rectifying unit.

In one embodiment, the main converter further comprises:

and the grounding detection unit is connected with the intermediate voltage discharge circuit and judges the grounding condition through half-voltage detection.

In one embodiment, the overhead cabinet further comprises:

and the fuse is connected with the input end of the breaker and cuts off the circuit when the input current of the power grid is overlarge.

In one embodiment, the overhead cabinet further comprises:

and a diode unit connected between the pantograph and the fuse to prevent the input voltage from reversely damaging the system circuit.

In an optional embodiment, the overhead line cabinet further comprises:

and the voltage and current detection unit is connected between the diode unit and the fuse and monitors the voltage or current input by the power grid by adopting a voltage sensor or a current sensor.

Compared with the prior art, the utility model has the advantages of:

the utility model provides a dual supply overhead line converter system for electronic round of off-highway vehicle, its main converter's alternating current input side is connected with the generator of vehicle, and two traction motor of vehicle are connected to the output side, and the input side of overhead line cabinet passes through the pantograph to be connected with the electric wire netting, the output side with main converter connects, for main converter input electric energy. Alternating current output by the main generator is converted into stable direct current after being rectified and inverted by the main converter and is used as input current of a connected traction motor, the direct current side is connected to a power grid through the wiring cabinet, and the power grid voltage is connected to the direct current side of the converter after passing through a filter circuit of the wiring cabinet to supply power to the direct current side. By adopting the converter system, a dual-energy solution is provided for the off-highway vehicle, the problems of low operating efficiency, high implementation cost and the like in the prior art are solved, the mining cost of the mine car is reduced in multiple dimensions, the consumption of diesel oil for driving is reduced, the environmental pollution is reduced, the operation reliability of the traction motor is improved, meanwhile, energy can be recycled in the vehicle braking process, the braking energy can be returned to a power grid, and the electric energy resource is saved.

Drawings

The invention is described in more detail below with reference to the accompanying drawings. Wherein:

fig. 1 shows a schematic diagram of a dual power overhead converter system for an electric wheel off-highway vehicle according to an embodiment of the present invention.

Detailed Description

The utility model provides a dual power overhead line converter system, belong to a dual power overhead line main circuit structure as dual energy solution, it can be applied to non-public road mining car, for example electronic round mining car, this system can effectively solve above-mentioned technical defect, when going uphill and downhill path, realize the energy switching through control switch, the pantograph rises as required, the converter realizes the steady connection between the rear of pantograph current collection and direct current bus, absorb powerful current impact behind the pantograph current collection, finally realize electronic round mining car and move under the operating mode that the pantograph current collection, braking energy can repay to the electric wire netting during while downhill path, reduce for fuel consumption cost by a wide margin, also will prolong the life-span of engine simultaneously by a wide margin, reduce the maintenance cost of engine, reduce open pit mining cost. The present invention will be further explained with reference to the accompanying drawings.

Example one

Fig. 1 shows a schematic structural diagram of a dual power overhead converter system for an electric-wheel off-highway vehicle according to an embodiment of the present invention, as shown in fig. 1, the system includes:

the alternating current input side of the main converter is connected with a generator of the vehicle, and the output side of the main converter is connected with two traction motors of the vehicle; and

and the input side of the stringing cabinet is connected with a power grid through a pantograph, and the output side of the stringing cabinet is connected with the main converter and is used for inputting electric energy to the main converter.

Further, in practical applications, the main converter may include:

a rectifying unit 2 connected to an output side of the vehicle generator, and converting ac power from the generator into dc power;

the input ends of the first inversion unit and the second inversion unit are connected with the output end of the rectification unit, the output ends of the two inversion units are respectively connected to two traction motors of the vehicle, and direct current output by the rectification unit is converted into alternating current with adjustable frequency and amplitude to drive the traction motors of the vehicle;

the two inversion units are respectively packaged with two capacitors, the four capacitors are connected in parallel to form a filtering loop and an energy storage branch circuit, and the filtering loop filters current transmitted to a vehicle traction motor and receives feedback voltage from the traction motor under the condition of vehicle braking.

The overhead line cabinet includes:

a contactor 10 for controlling the input and cut-off of the grid voltage;

and a filter unit 11 connected between the contactor and the main converter for filtering the direct current transmitted to the main converter.

In an alternative embodiment, the rectifying unit 2 of the main converter is a diode rectifying unit.

In practical application, the alternating current output by the main generator 1 is converted into direct current after passing through the rectifying unit 2, and the direct current is used as the input of the inverter circuit 5, the inverter circuit comprises two groups of inverter units, and the two groups of inverter units are respectively connected with the two traction motors in the embodiment to drive the motors to operate. The direct current side is connected to a power grid through a stringing cabinet serving as a stringing control unit, and the grid voltage of the power grid is connected to the direct current side of the main converter through the pantograph 6 and after passing through the contactor 10 and the filter unit 11, so as to supply power to the direct current side.

The utility model discloses a dual supply overhead line exchanges transmission system, control traction motor's that can be level and smooth input voltage, steady change traction motor's output. When the alternating current transmission system works: alternating current output by the main generator 1 is converted into direct current after passing through the rectifying unit 2, capacitors are packaged in the two inversion units, the four capacitors are connected in parallel to form a filtering loop and an energy storage branch circuit, stable direct current is output after being filtered by the capacitors, and the alternating current is inverted into three-phase variable-frequency variable-voltage alternating current after passing through the inversion module circuit 5 and is output to the traction motor to drive the traction motor.

The utility model provides a converter system circuit topological structure is through verifying, has very high reliability, satisfies electronic round of mine car completely to the requirement of electricity system of driving, and oil consumption reduction improves the efficiency of electronic round of mine car. Energy can be recycled during downhill braking, braking energy can be returned to a power grid, cost is saved, and meanwhile, the power grid provides a second power supply end, so that the running reliability of the off-highway vehicle is further guaranteed.

Example two

The utility model discloses a converter system includes the utility model discloses a main converter and overhead line cabinet. The main converter comprises a diode rectifying unit and a main inverting unit. The overhead line cabinet comprises a contactor and a filtering unit. Alternating current output by the main generator is converted into direct current through the rectifier module and is used as input of the inverter modules, and the two groups of inverter modules are respectively connected with the two traction motors to drive the motors to operate. The direct current side is connected with a power grid through a stringing unit, the power grid provides voltage for the converter during traction, and energy is fed back to the power grid during braking. Besides, in a preferred embodiment, the main converter may further include:

and the intermediate voltage discharge loop 4 is provided with two discharge resistors which are connected in series to the positive busbar and the negative busbar, and the direct-current voltage is discharged through the discharge resistors under the abnormal power failure condition.

And a high voltage indicating unit 3, one end of which is connected with the output end of the filtering unit 11 and the output end of the rectifying unit in the overhead line cabinet, and the other end of which is connected with the input end of the intermediate voltage discharging circuit 4, wherein under the condition of abnormal power failure, the high voltage indicating unit prompts when the direct current side of the rectifying unit is monitored to be electrified.

The direct current link is provided with an intermediate voltage discharge loop 4 and a high voltage indicating unit 3 which are connected in series to a positive busbar and a negative busbar through two discharge resistors, direct current voltage can be discharged through the resistors under the condition of abnormal power failure, if the direct current side is electrified, the high voltage indicating lamp can indicate, and the converter is forbidden to operate at the moment.

Further, the overhead line cabinet further comprises:

and a diode unit 7 connected between the pantograph and the fuse, preventing the input voltage from reversely damaging the system circuit.

And a fuse 9 connected to an input terminal of the circuit breaker and interrupting a circuit when a grid input current is excessive.

In this embodiment, the pantograph 6 contacts with the power grid, and introduces the dc voltage of the power grid into the dc side of the converter after passing through the overhead line cabinet, and then supplies power to the motor through the inverter module. The rack cabinet comprises a parallel diode unit 7, which prevents the reverse damage of the inversion module caused by the input direct current voltage. The fuse 9 prevents damage to the main converter in the event of excessive current. The K1 of the contactor 10 controls the input and the removal of the power grid voltage, and the power supply can be removed in time under the fault state, so that the fault expansion is avoided. The filtering unit 11 filters the input power supply to prevent the main converter from being damaged by overlarge impact current.

Further, in an optional embodiment, the main converter further includes:

and the grounding detection unit is connected with the intermediate voltage discharge circuit, judges the grounding condition through half-voltage detection and monitors a grounding fault signal of the circuit.

And the voltage and current detection unit 8 is connected between the diode unit and the fuse and is used for monitoring the voltage or the current input by the power grid by adopting a voltage sensor or a current sensor.

When the braking condition is met, the traction motor 1 and the traction motor 2 feed back energy to the main converter, the direct-current voltage of the main converter is increased, the direct-current voltage can be fed back to a power grid through the overhead line cabinet, and the braking energy is fully utilized.

Specifically, the utility model discloses the function of each subassembly of well dual supply overhead line converter system in entire system is shown as following table:

function statistical table for each component of converter system

This converter adopts dual supply overhead line mode, and it is slow to have solved traditional converter circuit operating speed when the vehicle goes up a slope, the braking energy is consumed by resistance when the oil consumption is high and the braking, and the problem of unable abundant recovery, braking energy can be through overhead line cabinet feedback electric wire netting when braking operating mode, in addition, the utility model discloses a concrete embodiment is last, and is simple and easy, still has advantages such as simple structure is compact, easy realization, reliability height, the utility model discloses a converter system main circuit converter passes through overhead line mode work, has improved efficiency, reduces the oil consumption, saves the cost.

It should be noted that, except the utility model discloses in the converter main circuit topological structure that has clearly described, increase the fuse in the major loop, increase the capacitive filtering link in the direct current link, increase main circuit topology design methods such as sensor in converter input side, direct current side, output side, all belong to the utility model discloses the technical scope who claims.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. The present invention is not limited to the particular embodiments disclosed herein, but encompasses all technical solutions falling within the scope of the claims.

Claims (10)

1. A dual power overhead converter system for an electric wheel off-highway vehicle, the system comprising:

the alternating current input side of the main converter is connected with a generator of the vehicle, and the output side of the main converter is connected with two traction motors of the vehicle; and

and the input side of the stringing cabinet is connected with a power grid through a pantograph, and the output side of the stringing cabinet is connected with the main converter and is used for inputting electric energy to the main converter.

2. The converter system of claim 1, wherein said primary converter comprises:

a rectifying unit connected to an output side of the vehicle generator, and converting alternating current from the generator into direct current;

the input ends of the first inversion unit and the second inversion unit are connected with the output end of the rectification unit, the output ends of the two inversion units are respectively connected to two traction motors of the vehicle, and direct current output by the rectification unit is converted into alternating current with adjustable frequency and amplitude to drive the traction motors of the vehicle;

the two inversion units are respectively packaged with two capacitors, the four capacitors are connected in parallel to form a filtering loop and an energy storage branch circuit, and the filtering loop filters current transmitted to a vehicle traction motor and receives feedback voltage from the traction motor under the condition of vehicle braking.

3. The converter system of claim 1, wherein the overhead cabinet comprises:

a contactor for controlling the input and cut-off of the network voltage;

and the filtering unit is connected between the contactor and the main converter and is used for filtering the direct current transmitted to the main converter.

4. The converter system of claim 2, wherein said primary converter further comprises:

and the intermediate voltage discharge loop is provided with two discharge resistors which are connected in series to the positive busbar and the negative busbar, and the direct-current voltage is discharged through the discharge resistors under the abnormal power-off condition.

5. The converter system of claim 4, wherein said primary converter further comprises:

and one end of the high-voltage indicating unit is connected with the output end of the filtering unit and the output end of the rectifying unit in the overhead line cabinet, and the other end of the high-voltage indicating unit is connected with the input end of the intermediate voltage discharging loop.

6. The converter system according to claim 2, wherein the rectifying unit of the main converter is a diode rectifying unit.

7. The converter system of claim 2, wherein said primary converter further comprises:

and the grounding detection unit is connected with the intermediate voltage discharge circuit and judges the grounding condition through half-voltage detection.

8. The converter system of claim 3, wherein the overhead cabinet further comprises:

and the fuse is connected with the input end of the breaker and cuts off the circuit when the input current of the power grid is overlarge.

9. The converter system of claim 3, wherein the overhead cabinet further comprises:

and a diode unit connected between the pantograph and the fuse to prevent the input voltage from reversely damaging the system circuit.

10. The converter system of claim 6, wherein the overhead cabinet further comprises:

and the voltage and current detection unit is connected between the diode unit and the fuse and monitors the voltage or current input by the power grid by adopting a voltage sensor or a current sensor.

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