CN205622509U

CN205622509U - Rolling stock DC voltage converter with electric energy bidirectional function

Info

Publication number: CN205622509U
Application number: CN201620454710.6U
Authority: CN
Inventors: 李兴
Original assignee: CENTEROLE (DALIAN) ELECTRIC TRANSMISSION TECHNOLOGY Co Ltd
Current assignee: CENTEROLE (DALIAN) ELECTRIC TRANSMISSION TECHNOLOGY Co Ltd
Priority date: 2016-05-18
Filing date: 2016-05-18
Publication date: 2016-10-05
Anticipated expiration: 2026-05-18

Abstract

The utility model discloses a rolling stock DC voltage converter with electric energy bidirectional function, including two the same, as each other to set up for symmetry circuit that carry out DC voltage bidirectional transform, two equivalent condensers that the high -pressure port of this voltage changer set up including establishing ties and four series connection set up the IGBT with the model, two equivalent condensers and four parallelly connected settings of IGBT, the half -way point of two equivalent condensers and the half -way point of four IGBT series branchs are connected and meet neutral point O again, the low pressure port of this voltage changer is provided with filter capacitor, filter capacitor is connected with the IGBT series branch of high -pressure side through two equivalent filter inductor. The utility model provides a rolling stock DC voltage converter with electric energy bidirectional function under the same electric current quota condition, adopts two low voltage rating's IGBT series connection more economical than the IGBT who adopts a high voltage rating.

Description

There is the rolling stock DC voltage converter of electric energy transmitted in both directions function

Technical field

This utility model relates to the DC-DC conversion control device of a kind of direct current energy, particularly relates to a kind of railway On rolling stock, the input direct voltage that excursion is the widest is carried out the DC voltage conversion of constant voltage conversion output Device.

Background technology

The DC power supply of rail vehicles is usually from locomotive, and its rated voltage is DC600V, locomotive This DC power supply is converted to three-phase four-wire system 50Hz power frequency supply by the vehicle-mounted inverter on vehicle, for car Various power loads on are powered.

First, either diesel locomotive or electric locomotive, its communication power supply one is voltage change range Very big, thus the DC voltage causing commutator to export significantly changes；Two is that this DC voltage is the most too high, Be difficult to efficient, safe and reliable, economically be converted to rolling stock power meet electrical isolation require DC600V stable DC supply voltage.The DC source of diesel locomotive is by by high-power diesel engine-generating Three-phase alternating current electric rectification that unit sends and obtain, due to the rotation speed change of diesel engine be generally in the range of 400～ 1000r/min, by the fluctuation range also up to DC850V of the DC voltage that fairing obtains ～DC2650V, and the DC source of electric locomotive is the single phase alternating current power supply rectification by being exported by main transformer And obtain, owing to main transformer primary voltage fluctuation range is up to AC19kV～AC31kV and locomotive traction Needs, the fluctuation range of DC voltage is also the biggest, be therefore badly in need of a kind of can be by the change on locomotive The DC voltage that scope is the biggest is converted to the changer of the relatively low galvanic current pressure of voltage.

Secondly, on rail vehicles, DC power supply may be connected to Driven by inverter motor, Even it is directly connected to accumulator (such as hybrid locomotrives), is therefore also required to DC600V low-pressure side electricity The high-pressure side of DC850V～DC2650V can be fed back to.

3rd, it is contemplated that the load equipment that locomotive DC power supply connects is more, for ensureing the reliable of equipment Safe operation, it is desirable to the low-pressure port of DC voltage converter has abnormal voltage defencive function, the most abnormal When voltage occurs, will carry out suppression process immediately, in order to avoid bringing disaster to connected load equipment.

In sum, rail vehicles DC voltage converter must have concurrently from high pressure port to low-pressure port Decompression transformation, boosting inverter from low-pressure port to high pressure port and abnormal voltage protect this three functions.

Traditional rail vehicles DC voltage converter generally uses typical DC-DC step-down conversion circuit As shown in figure 11, although decompression transformation can be realized in this circuit theory, but be intended to adapt to the width of high pressure port Voltage change range and High Level DC Voltage, the voltage nominal value of semiconductor switch device IGBT should be by ceiling voltage Value selects, and the device meeting this requirement is expensive.And IGBT nominal voltage is the highest, its switching frequency is just The lowest, and switching frequency is low brings equipment output harmonic wave big, harmonic wave to be reduced is necessary for strengthening filter inductance, The equipment cost performance of causing is the lowest, and the volume of equipment and quality certainly will be the biggest.This rail vehicles DC voltage Changer can be efficiently against all drawbacks of traditional rail vehicles DC power-supply system.

Utility model content

The utility model discloses a kind of rolling stock DC voltage conversion with electric energy transmitted in both directions function Device, including two identical, circuit carrying out DC voltage two-way changing of mutually symmetrical setting, this voltage The high pressure port of changer include be arranged in series two equivalent capacitance devices and four be arranged in series same model IGBT, said two equivalent capacitance device and four IGBT are arranged in parallel, the intermediate point of two equivalent capacitance devices It is connected with the intermediate point of four IGBT series arms and connects neutral point O again；The low-pressure port of this voltage changer Being provided with filter capacitor, described filter capacitor is gone here and there with on high-tension side IGBT by two equivalent filter inductances Connection branch road is connected.

Described four IGBT are respectively an IGBT, the 2nd IGBT, the 3rd IGBT and the 4th IGBT, Said two equivalence filter inductance is filter inductance I and filter inductance II, described filter inductance I and first The junction point of IGBT and the 2nd IGBT is connected, described filter inductance II and the 3rd IGBT and the 4th IGBT Junction point be connected.

Said two equivalent capacitance device is capacitor C1 and capacitor C2, the colelctor electrode c of a described IGBT The positive pole of terminating capacitor C1, the negative pole of the emitter e terminating capacitor C2 of described 4th IGBT, second The emitter e end of IGBT and the colelctor electrode c end of the 3rd IGBT be connected again with in two equivalent capacitance devices Between exit be connected, two equivalent capacitance devices in the middle of draw termination neutral point O.

Owing to have employed technique scheme, the machine with electric energy transmitted in both directions function that this utility model provides Car vehicle DC voltage changer, in the case of same electric current quota, uses the IGBT of two low-voltage rated values Series connection is more more economical than the IGBT using a high voltage rated value；The IGBT of low-voltage rated value compares high voltage The switch operating frequency that the IGBT of rated value allows is higher, is conducive to reducing filter inductance and the volume of electric capacity； Additionally low-pressure port is conducive to energy efficiency to the boosting inverter function of high pressure port.

Accompanying drawing explanation

In order to be illustrated more clearly that the embodiment of the present application or technical scheme of the prior art, below will be to enforcement In example or description of the prior art, the required accompanying drawing used is briefly described, it should be apparent that, describe below In accompanying drawing be only some embodiments described in the application, for those of ordinary skill in the art, On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Fig. 1 is circuit theory diagrams of the present utility model；

Fig. 2 is that energy can the circuit 1 of transmitted in both directions；

Fig. 3 is that energy can the circuit 2 of transmitted in both directions；

Fig. 4 is Fig. 2 and Fig. 3 two circuit input end concatenation, the circuit theory diagrams of outfan concatenation；

The circuit theory diagrams of current path 1 when Fig. 5 is circuit work；

The circuit theory diagrams of current path 2 when Fig. 6 is circuit work；

The circuit theory diagrams of current path 3 when Fig. 7 is circuit work；

The circuit theory diagrams of current path 4 when Fig. 8 is circuit work；

The circuit theory diagrams of current path 5 when Fig. 9 is circuit work；

The circuit theory diagrams of current path 6 when Figure 10 is circuit work；

Figure 11 is the schematic diagram of Typical pressure drop translation circuit in background technology；

Detailed description of the invention

For making the technical solution of the utility model and advantage clearer, below in conjunction with this utility model embodiment In accompanying drawing, the technical scheme in this utility model embodiment is carried out the most complete description:

The rolling stock DC voltage converter with electric energy transmitted in both directions function as shown in Fig. 1-Figure 10, should Voltage changer includes two identical, main circuits carrying out DC voltage two-way changing of mutually symmetrical setting. Two main circuit specular become DC voltage converter disclosed in the present application after arranging.This voltage changer High pressure port include be arranged in series two equivalent capacitance devices and four IGBT being arranged in series same model.Two Individual equivalent capacitance device is capacitor C1 and capacitor C2.Four IGBT be respectively an IGBT V1, second IGBT V2, the 3rd IGBT V3 and the 4th IGBT V4.Capacitor C1, capacitor C2 and four IGBT It is arranged in parallel.The intermediate point of capacitor C1, the intermediate point of capacitor C2 and four IGBT series arms is connected Connect and connect neutral point O again.The low-pressure port of this voltage changer is provided with filter capacitor C3, filter capacitor C3 is connected with on high-tension side IGBT series arm by two equivalent filter inductances.Two equivalent filtered electrical Sense is filter inductance I L1 and filter inductance II L2.A described filter inductance I L1 and IGBT V1 and The junction point of the 2nd IGBT V2 is connected.Described filter inductance II L2 and the 3rd IGBT V3 and the 4th IGBT The junction point of V4 is connected.

Two equivalent capacitance devices are capacitor C1 and capacitor C2, the colelctor electrode c termination of an IGBT V1 The positive pole of capacitor C1, the negative pole of the emitter e terminating capacitor C2 of the 4th IGBT V4, the 2nd IGBT The emitter e end of V2 and the colelctor electrode c end of the 3rd IGBT V3 be connected again with in two equivalent capacitance devices Between exit be connected, two equivalent capacitance devices in the middle of draw termination neutral point O.

The high side voltage of this DC voltage converter is added by capacitor C1 and the positive and negative two-terminal of capacitor C2, Low-pressure side positive polarity is guided to filter by an IGBT V1 and the 2nd IGBT V2 junction point filtered inductance I L1 Ripple capacitor C3 anode, low-pressure side voltage negative pole by the 3rd IGBT V3 and the 4th IGBT V4 junction point through filter Ripple inductance II L2 guides to filter capacitor C3 negative terminal, and load connects the positive and negative two ends of filter capacitor C3.

Four kinds of mode of operations of the present utility model are as follows:

1. conventional buck pattern conversion

(1). control an IGBT V1 and the 4th IGBT V4 conducting, the 2nd IGBT V2 and the 3rd IGBT V3 turns off, and now, high side voltage is added on filter inductance I L1 through an IGBT V1 and the 4th IGBT V4 Filter inductance II L2 and filter capacitor C3 and load, the path of electric current as shown in Figure 5, to filter capacitor C3 charges, to filter inductance I L1 and filter inductance II L2 energy storage.

(2). control the oneth IGBTV1, the 4th IGBT V4, the 2nd IGBT V2, the 3rd IGBT V3 close Disconnected, now, high-pressure side and low-pressure side are kept apart, the path of electric current as shown in Figure 6, rely on filter inductance I L1 and The energy storage of filter inductance II L2 maintains electric current.Make (1) and (2) two kinds of control alternate cycles, realize normal fall Buckling is changed.

2. the decompression transformation pattern of equivalent switching frequency multiplication

(3). control an IGBT V1 conducting, the 2nd IGBT V2, the 3rd IGBT V3, the 4th IGBT V4 Being both off, now, high side voltage positive terminal is added on filter inductance I L1 and filter inductance through an IGBT V1 II L2 and filter capacitor C3 and load, through the fly-wheel diode of the 3rd IGBT V3 return to capacitor C1 and The intermediate point of capacitor C2, as shown in Figure 7, the upper half of high side voltage is to filter capacitor in the path of electric current C3 charges, to filter inductance I L1 and filter inductance II L2 energy storage.

(4). control the 4th IGBT V4 conducting, an IGBT V1, the 2nd IGBT V2, the 3rd IGBT V3 Be both off, now, high side voltage midpoint the 2nd IGBT V2 fly-wheel diode be added on filter inductance I L1, Filter inductance II L2 and filter capacitor C3 and load, return to the negative pole of power supply through the 4th IGBT V4, electricity As shown in Figure 8, the lower half of high side voltage is charged to filter capacitor C3, to filter inductance in the path of stream I L1 and filter inductance II L2 energy storage.

(5). control an IGBT V1, the 4th IGBT V4, the 2nd IGBT V2, the 3rd IGBT V3 all Turning off, now, high-pressure side and low-pressure side are kept apart, and the path of electric current as shown in Figure 6, relies on filter inductance I L1 Energy storage with filter inductance II L2 maintains electric current.

Suitably control above-mentioned (3), the operation duration phase of (4) and (5), both can decompression transformation normally, can take into account again Two parts balance of voltage up and down of electric capacity, an IGBT V1 and the timing of the 4th IGBT V4 switching frequency one, wrong Convince the logical equivalent switching frequency increasing making outlet side by patient analysis to be twice.

3. electric energy feedback control model

(6) if. low-pressure side is loaded with inversion needs, can control the 2nd IGBT V2 and the 3rd IGBT V3 and lead Logical, an IGBT V1 and the 4th IGBT V4 turns off, and low-pressure side U2 is to filter inductance I L1 and filter inductance II L2 energy storage, the path of electric current is as shown in Figure 9.

(7). control an IGBT V1, the 4th IGBT V4, the 2nd IGBT V2, the 3rd IGBT V3 all Turn off, under the effect of filter inductance I L1 and filter inductance II L2 energy storage, through an IGBT V1 and the 4th The fly-wheel diode of IGBT V4, charges to high-pressure side electric capacity, and the path of electric current is as shown in Figure 10.Make (6) and (7) two kinds control alternate cycles, realize boosting inverter (feedback control).

4. abnormal voltage fault protection scheme

(8). in the case of normal decompression transformation, if having abnormal voltage to occur, for preventing from bringing disaster to the load of rear class, Controlling the 2nd IGBT V2 and the 3rd IGBT V3 conducting, an IGBT V1 and the 4th IGBT V4 turns off, Making voltage be inhibited, the path of its electric current is as shown in Figure 6.

By an IGBT V1 and the 4th IGBTV4 is optimized control in this utility model, can make The equivalent switching frequency multiplication of DC voltage converter decompression transformation, is more beneficial for filtering.

The above, only this utility model preferably detailed description of the invention, but protection model of the present utility model Enclose and be not limited thereto, the technology model that any those familiar with the art discloses at this utility model In enclosing, conceive in addition equivalent or change according to the technical solution of the utility model and utility model thereof, all Should contain within protection domain of the present utility model.

Claims

1. a rolling stock DC voltage converter with electric energy transmitted in both directions function, it is characterized in that: include two identical, circuit carrying out DC voltage two-way changing of mutually symmetrical setting, the high pressure port of this voltage changer includes be arranged in series two equivalent capacitance devices and four IGBT being arranged in series same model, said two equivalent capacitance device and four IGBT are arranged in parallel, and the intermediate point of the intermediate point of two equivalent capacitance devices and four IGBT series arms is connected and connects neutral point again；The low-pressure port of this voltage changer is provided with filter capacitor, and described filter capacitor is connected with on high-tension side IGBT series arm by two equivalent filter inductances.

The rolling stock DC voltage converter with electric energy transmitted in both directions function the most according to claim 1, it is further characterized in that: described four IGBT are respectively an IGBT, the 2nd IGBT, the 3rd IGBT and the 4th IGBT, said two equivalence filter inductance is filter inductance I and filter inductance II, the junction point of a described filter inductance I and IGBT and the 2nd IGBT is connected, and the junction point of described filter inductance II and the 3rd IGBT and the 4th IGBT is connected.

The rolling stock DC voltage converter with electric energy transmitted in both directions function the most according to claim 2, it is further characterized in that: said two equivalent capacitance device is capacitor C1 and capacitor C2, the positive pole of the colelctor electrode c terminating capacitor C1 of a described IGBT, the negative pole of the emitter e terminating capacitor C2 of described 4th IGBT, the emitter e end of the 2nd IGBT and the colelctor electrode c end of the 3rd IGBT are connected and are connected with the middle exit of two equivalent capacitance devices, draw termination neutral point in the middle of two equivalent capacitance devices.