JPH04150703A - Power supply for electric motor vehicle - Google Patents

Abstract

PURPOSE:To supply power continuously through a simple constitution by a constitution wherein a superconducting energy storing means, mounted on an electric motor vehicle which is fed with power from a stringing through a current collector, is charged when the stringing is contacting with the current collector whereas it is discharged when the current collector is separated from the stringing. CONSTITUTION:A filter capacitor 9 is charged from a stringing 1 through a current collector 3, a circuit breaker 5 and a filter reactor 7 mounted on an electric motor vehicle. When current is collected normally, a load on the vehicle is fed with power from the filter capacitor 9 through a stationary power converter 11. On the other hand, a charge/discharge section 13 conducts gate turn off thyristors GTO 19, 21 to charge a superconducting coil 15 and when the current detected through a CT 17 reaches the capacity of the superconducting coil 15, one GTO 21 is made nonconductive. When the current collector separates from the stringing to cause voltage drop of the capacitor 9, the GTO 19 is also made nonconductive and the capacitor 9 is charged from the superconducting coil 15 through diodes 23, 25. Consequently, power is fed stably through a simple constitution even when power supply from the stringing 1 is interrupted temporarily.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a power supply device for an electric vehicle.

(Prior Art) In an electric vehicle, energy is generally received from a power line such as an overhead wire or a third rail through a current collector, but the current collector sometimes separates from the power line while the vehicle is running. If the power supply line and the current collector are separated, even if the electrical equipment on the ground and on the vehicle is normal, if there is no energy stored on the vehicle, the energy will be momentarily cut off, causing trouble in driving. For this reason, a rotating motor generator is installed on the vehicle, allowing the vehicle to continue running even if the energy from the power line stops momentarily. It is now possible to continue generating output using rotational energy.

(Problems to be Solved by the Invention) Incidentally, with the development of ordinary power devices, it is being considered to install a static power converter in place of the above-mentioned rotary motor generator. Although static power converters are superior to motor generators in that they are smaller, lighter, and maintenance-free, they have almost no energy storage function, so they have no choice but to stop output in the event of a momentary interruption of input energy. However, there is a problem in that it is not possible to obtain the desired results, and some kind of countermeasure has been desperately needed.

Note that countermeasures have been taken, such as installing multiple current collectors on a vehicle to reduce the probability of simultaneous derailment, but in cases where the power supply for all vehicle formations is switched on the ground side, such as by section switching. There is, but not enough. It is also conceivable to use a storage battery located above ψ, but this would require a large capacity, resulting in an increase in size and weight, which is another problem.

The present invention has been made in view of the above, and an object of the present invention is to provide a power supply device for electric vehicles that can continue stable power supply with a simple configuration even if the power supply from the overhead wire is momentarily cut off. It is in.

[Structure of the Invention] (Means for Solving Problem 11) In order to achieve the above object, the present invention provides an electric vehicle having a drive control means that receives power from an overhead wire via a current collector and drives electrical equipment on the vehicle. The superconducting energy storage means installed on the vehicle and the superconducting energy storage means are charged by power supply from the overhead wire when the current collector is tangential to the overhead wire, and superconducting energy 1 is charged when the current collector is disconnected from the overhead wire.
The gist of the present invention is to include a charging/discharging means for discharging from the 1n means to the drive control means.

(Function) In the electric vehicle power supply device according to the present invention, a superconducting energy storage means is provided on the vehicle, and when the current collector is tangential to the overhead wire, the superconducting energy storage means is charged by power supply from the overhead wire, and the superconducting energy storage means is charged with respect to the overhead wire. When electrical appliances are disconnected, the superconducting energy storage means supplies power from the overhead wire via the current collector and discharges it to the drive control means that drives the electrical equipment on the train, thereby ensuring continuous power supply.

(Example) Hereinafter, the present invention will be explained in detail using the drawings.

1v4 is a diagram showing the configuration of an embodiment of the present invention. In the same figure, 1 is an overhead wire, 3 is an electrical current collector, and the energy received from the overhead wire 1 through the current collector 3 is as follows: It passes through the circuit breaker 5 and the filter reactor 7 and is accumulated in the filter capacitor 9 that constitutes the drive control means. Using this filter capacitor 9 as a stabilizing base, power is supplied to a load corresponding to electrical equipment on the vehicle via a static power converter 11.

On the other hand, a charging/discharging section 13 is provided at both ends of the filter capacitor 9.
A superconducting coil 15 constituting a superconducting energy storage means is connected through the superconducting coil 15 . The charge/discharge unit 13 is a rack vIA
When the C current collector 3 is tangential to the contact line 1, the superconducting coil 15 is charged by the power supplied from the overhead line 1, and the current collector a3 to the overhead line 1 is charged.
It has a function of discharging from the superconducting filter 15 to the filter capacitor 9 when the line is disconnected from the line, and is equipped with a current detector 17°GTO19, 21 and a diode 23,25.

In this example, superconducting coil 1 is used as the storage energy source.
7 was targeted because superconducting coils can store energy in the form of current, so they are highly efficient and quick to start up.
This is because it is compatible with in-vehicle equipment that requires no maintenance. Specifically, energy is applied to superconducting coils.
If it is contained, an energy density of about 3 KWH/m' can be secured.

Next, the operation of this embodiment will be explained.

First, if the current collection from the overhead wire 1 by the current collector 3 is normal,
Static power converter 1 using filter capacitor 9 as power source
1 supplies power to the load on the vehicle.

On the other hand, in the charging/discharging section 13, the GT019, 21 are kept in a conductive state, and when the current detected by the current detection 11i17 reaches the capacity of the superconducting coil 15, one of the GT01
O21 is made non-conductive. Since this superconducting coil 15 has a large inductance, the superconducting coil 15-Wi current detector 17-diode 23-GTO
A current circulates in the circulation path called 19-superconducting coil 15, creating a state in which energy is stored as a current energy source.

Next, when the current collector 3 is disconnected from the overhead line 1 and the potential of the filter capacitor 9 decreases, the GTO is immediately
By turning l9 into a non-conducting state, superconducting coil 1
5-current detector 17->diode 23-filter capacitor 9->diode 25-superconducting coil 15 current conducting path is formed, and filter capacitor 9 is charged. Then, when the potential of the filter capacitor 9 reaches a required level, the GTO 19 is returned to the conductive state, thereby re-forming the above-mentioned circulation path.

Note that if the stored energy in the superconducting coil 15 begins to decrease due to charging of the filter capacitor 9, the GTOs 19 and 21 are brought into conduction state and the superconducting coil 15 is charged before the above-mentioned circulation path is formed. .

Therefore, according to this embodiment, even if the current collector separates from the overhead wire, the filter capacitor is immediately charged from the superconducting coil, so the filter capacitor can be used as an uninterruptible power supply, and a static power converter. Even when the device is mounted on a vehicle, it is possible to reliably prevent a situation where the output to the load stops due to a momentary interruption of the input energy from the overhead wire. Furthermore, there is no need to provide multiple current collectors that require maintenance or to increase the capacity of the on-vehicle storage battery.

FIG. 2 is a diagram showing another embodiment of the present invention.

In the figure, 27 is a VVVF inverter, 29 is a main motor, and the same parts as in FIG. 1 are given the same reference numerals and detailed explanations will be omitted. The feature is that when braking, the kinetic energy of the vehicle is converted into electrical energy and returned to the overhead wire 1 as regenerative energy, but when the track is off, there is no regenerative load and the regenerative braking function disappears. . In addition to the same effects as the embodiment, it can contribute to improving the reliability of regenerative braking and saving energy.

In addition, in each of the embodiments described above, the charging/discharging section 13 is connected to the GTO1.
9 and 21, but the present invention is not limited thereto, and it goes without saying that other semiconductor switches may be used.

[Effects of the Invention] As explained above, according to the present invention, a superconducting energy storage means is provided on the vehicle, and when the current collector is tangential to the overhead wire, the superconducting energy storage means is charged by power supply from the overhead wire, and the current collector for the overhead wire is charged. When the train is out of line, the superconducting energy storage means is supplied with power from the overhead wire via the current collector and discharged to the drive control means that drives the electrical equipment on the train, so that continuous power is always supplied. With a simple configuration, stable power supply can be continued even after momentary power interruptions.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of one embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of another embodiment of the present invention. 1... Overhead line 3... Current collector 5... Circuit breaker 7... Filter reactor 9... Filter capacitor 11... Static power converter 13... Charging/discharging section 15... Superconducting Coil 17... Current detector 19... GTO 21... GTO 23... Diode 25... Diode 27... VVVF inverter 29... Main motor

Claims (1)

[Claims] In an electric car having a drive control means that receives power from the overhead wire via a current collector to drive electrical equipment on the vehicle, a superconducting energy storage means provided on the vehicle and when the current collector is tangential to the overhead wire, power is supplied from the overhead wire. 1. A power supply device for an electric vehicle, comprising: a charging/discharging means for charging a superconducting energy storage means, and for discharging from the superconducting energy storage means to the drive control means when a current collector is disconnected from an overhead wire.