CN201457105U - Alternating Current Drives for Vehicles Operating Short Distances - Google Patents

Abstract

The AC transmission device for short-distance running vehicles described in the utility model includes a traction inverter, an AC traction motor, a bipolar mobile pantograph, a vehicle-mounted charger, and a super capacitor. The bipolar mobile pantograph The positive pole is connected to the input terminal of the vehicle charger, and the negative pole is connected to the supercapacitor; the two output terminals of the vehicle charger are connected to the supercapacitor; the two input terminals of the traction inverter are connected to the supercapacitor. The device uses a supercapacitor as the power source, has a fast charging speed, realizes pure electric operation, has no pollutant discharge during use, and has no secondary pollution of the battery, and is environmentally friendly. In the case of rising oil prices and increasing pressure on environmental protection, power plants powered by supercapacitors operate in short distances and fixed areas, significantly improving the economic and environmental indicators of vehicles. The device is suitable for large motor vehicles operating on short-distance and fixed routes, such as port tractors and airport shuttle vehicles.

Description

Alternating Current Drives for Vehicles Operating Short Distances

technical field

The utility model relates to an electric drive vehicle, in particular to an AC drive device for a short-distance running vehicle.

Background technique

Existing large-scale motor vehicle, its power unit roughly is divided into three classes: the first class: internal combustion engine+mechanical transmission device, it uses petroleum as energy source, realizes step-by-step speed regulation through the gearbox. This method has the characteristics of mature technology, strong battery life, and a wide range of power options, but it has high pollution, large emissions, and poor fuel economy, making it difficult to meet the needs of energy conservation and environmental protection. The second category: internal combustion engine + electric transmission, which uses the internal combustion engine to drive the generator to generate electricity, and then through the battery energy storage and electric energy conversion links, the traction motor drives the wheels to run, which is an increasingly mature electric vehicle transmission method. This method uses battery energy storage to provide vehicle starting and acceleration energy, so that the engine power can be relatively reduced, but the complexity and cost of the vehicle are high, and there are still problems of engine fuel emission and secondary pollution of the energy storage battery. The third category: wire network + electric transmission device, which is to wire on the vehicle running line, the vehicle obtains electric energy through the pantograph, and then drives the vehicle through a DC or AC traction motor. It has the advantages of clean energy, no emissions, and good environmental protection. However, the engineering volume of the wire grid is large and the wire network is intertwined, which affects the landscape of the line and greatly limits its application.

The power plant is one of the core components of the vehicle. It realizes the operation of the vehicle through energy conversion. The energy conversion method, power level, traction and braking characteristics, environmental protection and other factors are used to measure the performance of the vehicle and the cost performance. Key factor. Motor vehicles operating in short distances and fixed areas, such as port tractors, airport shuttles, etc., cannot achieve economical and environmentally friendly operation by using the above-mentioned three types of power devices.

Contents of the invention

The utility model provides an AC drive device for short-distance running vehicles in order to solve the problems of high operating costs and environmental protection of motor vehicles running in short-distance and fixed areas.

The utility model is realized by adopting the following technical scheme: the AC transmission device of the short-distance running vehicle includes a traction inverter, an AC traction motor, and it also includes a bipolar mobile pantograph, a vehicle charger, and a super capacitor. The positive and negative poles of the bipolar mobile pantograph are connected to the input terminals of the vehicle charger; the two output terminals of the vehicle charger are connected to the supercapacitor; the two input terminals of the traction inverter are connected to the supercapacitor.

The AC transmission device of the short-distance running vehicle uses a supercapacitor as the working power source. When in use, a charging station is built in the operating area of the device or a charging grid is partially erected, and a bipolar mobile pantograph and a vehicle-mounted charger are used as the working power source. The capacitor is charged, and then the traction inverter is used to invert the DC power into a three-phase AC power supply, and then the AC traction motor works to provide power for the vehicle.

The AC transmission device for short-distance running vehicles described in the utility model uses a super capacitor as a power source, has a fast charging speed, can realize pure electric operation, has no pollutant discharge during use, and has no secondary pollution of the battery, and is environmentally friendly. Good performance, and can realize energy regenerative braking, improve energy saving and consumption reduction indicators. In the case of rising oil prices and increasing pressure on environmental protection, power plants powered by supercapacitors operate in short distances and fixed areas, significantly improving the economic and environmental indicators of vehicles. The device is suitable for large motor vehicles operating on short-distance and fixed routes, such as port tractors and airport shuttle vehicles.

Description of drawings

Fig. 1 is a schematic structural diagram of an AC drive for a short-distance running vehicle.

In the attached picture: CDJ-car charger, Fc-supercapacitor, NBQ-traction inverter, M-AC traction motor, AP-bipolar mobile pantograph, R-braking resistor, Q-charging protector, KM-DC circuit breaker.

Detailed ways

Now in conjunction with accompanying drawing 1 the specific embodiment of the present utility model is described further.

As shown in Figure 1, the AC transmission device of the short-distance running vehicle described in the present invention includes a traction inverter NBQ, an AC traction motor M, a bipolar mobile pantograph AP, an on-board charger CDJ, and a supercapacitor Fc , the positive and negative poles of the bipolar mobile pantograph AP are connected to the input terminals of the on-board charger CDJ; the two output terminals of the on-board charger CDJ are connected to the supercapacitor Fc; the two input terminals of the traction inverter NBQ are connected to the The supercapacitor Fc is connected.

The working process of the device is: bipolar mobile pantograph → vehicle charger → super capacitor → traction inverter → AC traction motor. In specific use, build a charging station or partially erect a charging grid in the operating area of the device, use the mobile pantograph AP and the on-board charger CDJ to charge the working power supply, that is, the supercapacitor Fc, and then use the traction inverter NBQ to reverse the direct current It becomes a three-phase AC power supply, and then provides power for the vehicle through the work of the traction motor M.

The supercapacitor Fc has the dual characteristics of a capacitor and a battery, and it consists of multiple supercapacitors connected in series and in parallel. It has high power density (1~2.5kW/kg); long cycle life, which can be used for 100,000 to 500,000 times; high charge and discharge efficiency, which can be greater than 95%; stable performance and maintenance-free, wide operating temperature limit (-40 ° C ~ + 50℃), no heavy metal secondary pollution, etc., it can provide the energy required for vehicle operation within a short distance (2-6 kilometers), and absorb the braking electric energy of the motor when braking. The supercapacitor Fc is equipped with a voltage and temperature detection device, which has certain functions of state detection and fault diagnosis. Supercapacitor Fc is a new, efficient, reliable and environmentally friendly power source.

The on-board charger CDJ is a DC/DC converter with controllable output voltage and current, which can charge the grid power into the supercapacitor Fc, that is, to realize constant voltage charging and constant current charging.

The bipolar mobile pantograph AP is a sliding pantograph with an automatic lifting and lowering device. Its positive pole is connected to the on-board charger CDJ, and its negative pole is connected to the supercapacitor Fc. When the motor vehicle runs to the charging station, it can The capacitor Fc is used for parking charging. If the charging network is to be built, the charging network can be built with a length of about 200 meters. When the vehicle runs to the charging network, the pantograph of the bipolar mobile pantograph AP rises and connects with the power grid, thus providing super The capacitor Fc is used for mobile charging, and the supercapacitor Fc is charged to saturation after the vehicle passes through the charging network, thereby realizing mobile charging.

In order to improve the function of the power device, a charging protector Q can be added to the device, and the charging protector Q is connected in series between the positive pole of the bipolar mobile pantograph AP and the vehicle charger CDJ. In the charging state, the charging protector Q is in the closed state. When the supercapacitor Fc is charged to saturation, the charging protector Q is disconnected first, and then the bipolar mobile pantograph AP is withdrawn from the charging grid to protect the safety of the charging system. .

In order to improve the function of the power device, a DC circuit breaker KM can be added to the device, and the DC circuit breaker KM is connected in series between the output terminal of the charger CDJ and the traction inverter NBQ. When the device is in normal working state, the DC circuit breaker KM is in the closed state. When the electrical system on the device has a short circuit, overcurrent or other faults in the line, the DC circuit breaker KM automatically trips and disconnects, thereby realizing the protection on the device. Electrical System.

In order to improve the function of the power device, a braking resistor R can be added to the device, and the two ends of the braking resistor R are respectively connected to the two input ports of the traction inverter NBQ. When braking, the control system follows the regenerative braking First, the principle of resistor R braking as a supplement. That is, energy regenerative braking is given priority, and the super capacitor Fc is used to directly absorb the braking feedback energy, which has high energy conversion efficiency and is conducive to improving the energy-saving index of vehicle operation; When the Fc charge is saturated, the excess electric energy of the traction motor is consumed to the resistor R through the inverter NBQ to perform resistance braking and improve the braking performance of the vehicle.

The above bipolar mobile pantographs, vehicle chargers, supercapacitors, charging protectors, DC circuit breakers, and braking resistors are all mature products on the market.

Claims (5)

1. the alternating current driving device of short range operational vehicle, comprise traction invertor (NBQ), AC traction motor (M), it is characterized in that: it also comprises bipole mobile pantograph (AP), vehicle-mounted charge machine (CDJ), super capacitor (Fc), and the both positive and negative polarity of described bipole mobile pantograph (AP) links to each other with vehicle-mounted charge machine (CDJ) input end; Described vehicle-mounted charge machine (CDJ) two mouths link to each other with super capacitor (Fc); Described traction invertor (NBQ) two input ends link to each other with super capacitor (Fc).

2. the alternating current driving device of short range operational vehicle as claimed in claim 1 is characterized in that: it also comprises charging protector (Q), and described charging protector (Q) is serially connected between the positive pole and battery charger (CDJ) of bipole mobile pantograph (AP).

3. the alternating current driving device of short range operational vehicle as claimed in claim 1 or 2 is characterized in that: it also comprises dc circuit breaker (KM), and described dc circuit breaker (KM) is serially connected between the mouth and traction invertor (NBQ) of battery charger (CDJ).

4. the engine installation of electronlmobil as claimed in claim 1 or 2, it is characterized in that: it also comprises braking resistor (R), described braking resistor (R) two ends link to each other with two input ports of traction invertor (NBQ) respectively.

5. the engine installation of electronlmobil as claimed in claim 3, it is characterized in that: it also comprises braking resistor (R), described braking resistor (R) two ends link to each other with two input ports of traction invertor (NBQ) respectively.

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