CN103879295B - Vehicle electric supply installation - Google Patents

Abstract

The invention provides a vehicle power supply device, which includes a control unit, an energy storage unit, and a traction inverter; the control unit is electrically connected to the energy storage unit, and the energy storage unit is connected to the traction inverter The control unit controls the energy storage unit to absorb the electric energy fed back by the traction inverter according to the working state of the traction inverter. The vehicle power supply device provided by the present invention controls the energy storage unit to absorb the electric energy fed back by the traction inverter through the control unit according to the working state of the traction inverter when the vehicle is braking, so as to realize energy recovery, and then recover the above-mentioned recovered electric energy It is further effectively used, and the vehicle power supply device provided by the present invention is easy to maintain due to its simple structure.

Description

Vehicle power supply unit

technical field

The invention relates to electrical technology, in particular to a vehicle power supply device.

Background technique

The vast majority of urban rail transit systems are used to carry passengers commuting in the city, and in many cases urban rail transit systems will be regarded as the backbone of urban traffic. Generally, the urban rail transit system is the method used by many cities to solve the traffic congestion problem.

When the vehicle is braking, the traction inverter will feed back energy, causing the network voltage of the power grid to rise. In order to balance the network voltage of the power grid, a resistor will be connected to the rear end of the traction inverter to consume the electric energy fed back by the inverter. Thereby ensuring the network voltage balance of the power grid. In addition, when the current vehicle passes through the no-power zone, the current vehicle will not have power supply from the grid, resulting in all equipment (lights, air conditioners, etc.) that require electric energy to work in a non-working state. When the motor vehicle passes through the dead zone, the battery is usually used to supply power for the traction inverter to achieve short-term traction so that the vehicle can pass through the dead zone smoothly; The electric energy is transmitted to the vehicle in the non-electric area, so as to realize the normal operation of the auxiliary power supply device (light and air conditioner, etc.) on the vehicle in the non-electric area. The specific main circuit structure is shown in FIG. 1 , which is a schematic diagram of the circuit structure of a vehicle power supply device in the prior art.

However, the use of resistance to consume energy leads to underutilization of energy; in addition, the bus runs through the entire vehicle, increasing the bus wiring and control equipment, which also increases the failure points of the vehicle, resulting in an increase in the maintenance cost of the vehicle. The battery supplies power to the traction inverter. Once the liquid in the battery leaks, it will cause environmental pollution, and the service life of the battery is limited. Therefore, the battery needs to be replaced, which increases the workload of maintenance personnel.

Contents of the invention

The invention provides a vehicle power supply device, which is used to solve the problems of energy waste and heavy workload of maintenance personnel in the prior art.

The invention provides a vehicle power supply device, including a control unit, an energy storage unit, and a traction inverter;

The control unit is electrically connected to the energy storage unit, the energy storage unit is electrically connected to the traction inverter, and the control unit controls the energy storage unit to absorb the energy according to the working state of the traction inverter. The electric energy fed back by the traction inverter mentioned above.

The above-mentioned vehicle power supply device preferably further includes an auxiliary power device, the auxiliary power device is electrically connected to the energy storage unit, and the control unit controls the The energy unit supplies power to the auxiliary power supply unit.

Furthermore, the control unit controls the energy storage unit to provide electric energy for the traction inverter according to the electric energy demand of the traction inverter.

Preferably, the energy storage unit is a supercapacitor.

The vehicle power supply device provided by the present invention controls the energy storage unit to absorb the electric energy fed back by the traction inverter through the control unit according to the working state of the traction inverter when the vehicle is braking, so as to realize energy recovery, and then recover the above-mentioned recovered electric energy Further effective utilization, and the vehicle power supply device provided by the present invention is easy to maintain due to its simple structure.

Description of drawings

FIG. 1 is a schematic diagram of a circuit structure of a vehicle power supply device in the prior art;

Fig. 2 is a schematic structural diagram of an embodiment of a vehicle power supply device of the present invention;

Fig. 3 is a schematic structural diagram of the main circuit of the vehicle power supply device in practical application of the present invention.

detailed description

Fig. 2 is a schematic structural diagram of an embodiment of the vehicle power supply device of the present invention. As shown in Figure 2, the vehicle power supply device provided by this embodiment includes: a control unit 11, an energy storage unit 12 and a traction inverter 13, wherein the control unit 11 is electrically connected to the energy storage unit 12, and the energy storage unit 12 is connected to the traction The inverter 13 is electrically connected, specifically, the energy storage unit 12 is connected in series to the DC input end of the traction inverter 13, and the control unit 11 controls the energy storage unit 12 to absorb the energy generated by the traction inverter 13 according to the working state of the traction inverter 13. Feedback power.

In practical applications, the working condition of the subway is frequent starting and braking. Every time the subway vehicle starts, the traction inverter needs to absorb a large amount of electric energy, which will cause the subway network voltage to drop, and when the vehicle brakes, it will generate Huge energy raises the network voltage, but the network voltage fluctuation range of the subway is limited. If it exceeds this range, the grid protection action will be triggered. The alternating current is converted into direct current to supply power to the traction motor of the vehicle. When the vehicle brakes, due to the inertia of the vehicle, the rotor of the traction motor is still rotating, and the vehicle continues to move forward. Therefore, after braking, the traction inverter 13 will The alternating current generated by the motor is rectified into direct current. When the control unit 11 detects that the working state of the traction inverter 13 is in the rectified state, that is, when the vehicle is in the braking state, the energy storage unit 12 is controlled to absorb the energy fed back by the traction inverter 13 . In addition, since the braking action of the vehicle is initiated by the staff in the driver's control room, during braking, the staff can manually control the control unit 11 so that the DC rectified by the traction inverter can charge the energy storage unit 12 .

The vehicle power supply device provided in this embodiment controls the energy storage unit to absorb the electric energy fed back by the traction inverter through the control unit according to the working state of the traction inverter when the vehicle is braking, so as to realize energy recovery, and then recover the above-mentioned Electric energy is further effectively utilized, and the vehicle power supply device provided by this embodiment is easy to maintain due to its simple structure.

Fig. 3 is a schematic diagram of the main circuit structure of the vehicle power supply device in practical application according to the present invention. Preferably, the vehicle power supply device provided in this embodiment also includes an auxiliary power supply device 14. On the basis of the above embodiment, the following will refer to Fig. 3 The above-mentioned vehicle power supply device is further described. Specifically, the vehicle includes two motor vehicles and two trailers as an example. 13, and the vehicle connected to the grid through a pantograph; and the above-mentioned two trailers refer to a vehicle provided with an auxiliary power supply device 14, wherein the auxiliary power supply device 14 is connected to the energy storage unit 12 in series.

Specifically, when the vehicle is running, when the driver controls the handle to the brake position, it means that the vehicle is braking. At this time, the traction inverter 13 will feed back energy to the grid and the energy storage unit 12, and the traction inverter 13 will regenerate The electric energy generated by the motor will charge the energy storage unit 12. Furthermore, when the trailer enters the non-electric zone, the control unit 11 will control the energy storage unit 12 to release energy to supply power for the auxiliary power supply device 14, thereby realizing the equipment powered by the auxiliary power supply device. (lighting equipment and air conditioners, etc.) work normally in areas without electricity. The auxiliary power supply device 14 and the energy storage unit 12 can be connected through a diode (not shown in the figure), and the unidirectional conduction characteristic of the diode ensures that when the energy storage unit 12 is discharged, it only provides electric energy for the auxiliary power supply device 14, The electric energy of the energy storage unit 12 is prevented from being absorbed by the traction inverter 13 .

When the vehicle is started, the traction inverter 13 needs to consume a large amount of electric energy, and the energy storage unit 12 absorbs the electric energy generated when the vehicle regeneratively brakes, and can also serve as a power source for the traction inverter 13 when the rail vehicle is performing high-power traction or entering a non-electric zone. To provide electric energy, at this moment, the control unit 11 controls the energy storage unit 12 to provide electric energy for the traction inverter 13 according to the electric energy requirement of the traction inverter 13, so as to start the vehicle. In addition, since the starting of the vehicle is completed by the staff in the driver's control room, the staff can manually control the control unit 11, and then control the energy storage unit 12 to provide electric energy for the traction inverter, so as to realize the rapid start of the vehicle. The energy storage unit 12 in the present invention can also provide electric energy for the traction inverter after the vehicle enters the dead zone, so that the vehicle passes through the dead zone smoothly.

Preferably, in the above embodiments provided by the present invention, the energy storage unit 12 may also be a supercapacitor.

Due to the fast charging and discharging speed of the supercapacitor, it can quickly absorb electric energy when the traction inverter feeds back electric energy, realize rapid energy recovery, and reduce the impact on the power grid, and when the traction inverter 13 needs a large amount of electric energy, the supercapacitor can Rapid release of electric energy enables the vehicle to accelerate in a short time. In addition, the supercapacitor has a long service life and can be charged and discharged up to hundreds of thousands of times, which can effectively save costs, and because the supercapacitor adopts a solid structure, it will not pollute the environment.

The vehicle power supply device provided by the present invention can be used in the case where the dead zone is relatively short, and can also be used in the case where the dead zone is long. In the power zone, the vehicle power supply device provided by the present invention can utilize the electric energy absorbed by the energy storage unit during the braking process to effectively realize the power supply to the traction inverter and the auxiliary power supply device. The vehicle power supply device provided by the invention not only effectively utilizes energy, but also solves the power supply problem of the traction inverter and the auxiliary power supply device in the non-electric zone.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (3)

1. A vehicle power supply device, characterized in that it comprises a control unit, an energy storage unit, and a traction inverter; The control unit is electrically connected to the energy storage unit, the energy storage unit is electrically connected to the traction inverter, and the control unit controls the energy storage unit to absorb the energy according to the working state of the traction inverter. The electric energy fed back by the traction inverter; The vehicle power supply device also includes an auxiliary power supply device electrically connected to the energy storage unit, and the control unit controls the energy storage unit to be the auxiliary power supply unit according to whether the auxiliary power supply device is in a dead zone. power supply unit; The auxiliary power supply device is connected to the energy storage unit through a diode. 2. The vehicle power supply device according to claim 1, wherein the control unit controls the energy storage unit to provide electric energy for the traction inverter according to the electric energy demand of the traction inverter. 3. The vehicle power supply device according to any one of claims 1 to 2, wherein the energy storage unit is a supercapacitor.