CN206367387U - A kind of city rail vehicle power supply circuit and city rail vehicle - Google Patents

Abstract

The utility model discloses a power supply circuit for an urban rail vehicle and an urban rail vehicle, comprising a plurality of supercapacitors; the plurality of supercapacitors are connected in parallel and connected to a power receiving device; each supercapacitor supplies power for a traction inverter. The utility model connects multiple supercapacitors in parallel, and the parallel connected supercapacitors provide power for multiple traction inverters of the vehicle. Then when one supercapacitor fails, the remaining two supercapacitors will provide power for all traction inverters. The inverter provides power, and the vehicle will not lose power; only one power receiving device is needed, the cost is low, and the failure point is reduced; multiple inverters share a high-speed circuit breaker, which effectively reduces the number of high-speed circuit breakers and greatly reduces the cost. ; The scalability of the power supply circuit is stronger.

Description

A kind of urban rail vehicle power supply circuit and urban rail vehicle

technical field

The utility model relates to the high-voltage electric field of the vehicle control part, in particular to a power supply circuit of an urban rail vehicle and an urban rail vehicle.

Background technique

Existing trams use pantographs or other power-receiving equipment to receive electric energy from the catenary or three-rail, etc., for vehicle traction and power supply for the entire vehicle, and the energy generated by electric braking is fed back to the grid for other vehicles on the same grid. Running vehicles, if other vehicles cannot absorb it, the feedback electric energy will be consumed in the form of heat on its braking resistor, resulting in energy waste. As shown in Figure 1, the circuit cannot be separated from the catenary when it is powered by the catenary, and the electric braking energy cannot be absorbed by itself when the vehicle is electrically braked, and can only be transmitted to the catenary. When the catenary cannot absorb it, it will use The heating of the braking resistor consumes excess capacity and wastes energy; multiple traction inverters need to be controlled separately by multiple high-speed circuit breakers, and the cost is high; the air conditioning system needs the three-phase output of the auxiliary inverter to work, which cannot be avoided The air conditioner stops working caused by the stop working.

At present, there is a power supply circuit using an independent power supply scheme (as shown in Figure 2), that is, each supercapacitor only provides energy to one traction inverter, and when the supercapacitor fails, the corresponding traction inverter will also stop working , with poor redundancy. At the same time, each group of supercapacitors needs to use a receiver when charging, which is costly and increases the number of failure points. Due to the independent power supply of the supercapacitor bank, each traction inverter needs to be installed with a high-speed circuit breaker (HSCB), and the cost is relatively high.

Contents of the invention

The technical problem to be solved by the utility model is to provide an urban rail vehicle power supply circuit and an urban rail vehicle in view of the deficiencies in the prior art.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a power supply circuit for urban rail vehicles, including a plurality of supercapacitors; the plurality of supercapacitors are connected in parallel to the power receiving device; Power supply for multiple traction inverters of the vehicle.

One end of a high-speed circuit breaker is connected to the terminal, and the other end is connected to all traction inverters. Multiple traction inverters share one high-speed circuit breaker, effectively reducing the number of high-speed circuit breakers and greatly reducing circuit costs.

Each traction inverter is connected to the high-speed circuit breaker through a contactor, which is convenient for controlling the operation of the traction inverter.

The positive input terminal of the DC inverter air conditioner of the urban rail vehicle is connected to the terminal, and the negative input terminal of the DC inverter air conditioner is connected to the negative pole of the super capacitor. The air conditioning system can work independently without being attached to the three-phase output of the auxiliary inverter, greatly reducing the The air conditioner failure caused by the inverter stop working.

The urban rail vehicle of the present utility model adopts the above-mentioned power supply circuit.

Compared with the prior art, the utility model has the beneficial effects as follows: the utility model uses a supercapacitor to supply power, and can absorb all the electric energy generated by electric braking without loss of electric energy; Charging is only performed when passengers get on and off the bus in the platform area, and the power grid is not required during operation; multiple supercapacitors are connected in parallel, and the parallel connected multiple supercapacitors provide power for multiple traction inverters of the vehicle, then when a supercapacitor After the capacitor fails, the remaining two supercapacitors will provide power for all traction inverters, and the vehicle will not lose power; only one power receiving device is needed, which is low in cost and reduces the point of failure; multiple inverters share a high-speed The circuit breaker effectively reduces the number of high-speed circuit breakers and greatly reduces the cost; the air-conditioning system can work independently and does not depend on the three-phase output of the auxiliary inverter, which greatly reduces the air-conditioning failure caused by the auxiliary inverter stopping; power supply The scalability of the circuit is stronger.

Description of drawings

Fig. 1 is the schematic diagram of existing power supply circuit;

Fig. 2 is the schematic diagram of the power supply circuit of the existing independent power supply scheme;

Fig. 3 is a schematic circuit diagram of an embodiment of the utility model;

in:

1: Pantograph (cannot be separated from catenary); 2: Inverter air conditioner; 3: 8KW charger; 4: 15KVA auxiliary inverter; 5: Super capacitor; 6: Pantograph (only used on the platform); 7: DC frequency conversion air conditioner;

detailed description

As shown in Figure 3, an embodiment of the utility model includes three supercapacitors; after the three supercapacitors are connected in parallel, they are connected to the power receiving device through the terminal; after multiple supercapacitors are connected in parallel, they supply power to multiple traction inverters of the vehicle One end of a high-speed circuit breaker is connected to the terminal, and the other end is connected to all traction inverters; multiple supercapacitors are connected in parallel to supply power to multiple traction inverters in the vehicle; one end of a high-speed circuit breaker HSCB is connected to the terminal, and the high-speed The other end of the circuit breaker terminates all traction inverters.

Each traction inverter is connected to the high-speed circuit breaker through a contactor.

The positive input terminal of the DC frequency conversion air conditioner of the urban rail vehicle is connected to the terminal, and the negative input terminal of the DC frequency conversion air conditioner is connected to the negative pole of the super capacitor.

The supercapacitor can store electric energy, so the vehicle can use the supercapacitor system to supply power and can absorb all the electric energy generated by electric braking without causing power loss; after the supercapacitor is charged in the platform area, the supercapacitor can provide the vehicle with working power during operation , so it gets rid of the shackles of the catenary; the air-conditioning system does not depend on the three-phase output of the auxiliary inverter, which greatly reduces the air-conditioning failure caused by the shutdown of the auxiliary inverter.

The one-to-one power supply mode in which a single supercapacitor supplies power to a single traction inverter will inevitably cause vehicle power loss when the supercapacitor fails. For example, a vehicle uses three sets of supercapacitors to supply power to three traction inverters respectively. But when a supercapacitor fails, the corresponding traction inverter will not work, and the vehicle will lose 1/3 of its power. After the three supercapacitors are connected in parallel, they can provide power to the three traction inverters of the vehicle at the same time, then when one supercapacitor fails, the remaining two supercapacitors will provide power to the three traction inverters, and the vehicle will not lose power.

In addition, after the supercapacitor adopts the parallel power supply mode, the receiver (the receiver can be the bottom receiver or the roof receiver) can be unified into one, which can reduce the number of fault points. The supercapacitor parallel design allows multiple traction inverters to share one high-speed circuit breaker, effectively reducing the number of high-speed circuit breakers and greatly reducing costs.

Claims (5)

1. a kind of city rail vehicle power supply circuit, it is characterised in that including many super capacitors；After many super capacitors are in parallel It is connected by binding post with current-collecting device；Powered after many super capacitors are in parallel for many traction invertors of vehicle.

2. city rail vehicle power supply circuit according to claim 1 a, it is characterised in that high-speed circuit breaker one terminates described Binding post, the other end terminates all traction invertors.

3. city rail vehicle power supply circuit according to claim 2, it is characterised in that every traction invertor is connect by one Tentaculum is connected with the high-speed circuit breaker.

4. city rail vehicle power supply circuit according to claim 3, it is characterised in that the DC frequency converting air-conditioner of city rail vehicle is just The input termination binding post, DC frequency converting air-conditioner negative input termination super capacitor negative pole.

5. a kind of city rail vehicle, it is characterised in that using the power supply circuit described in one of the claims 1~4.