CN103095201A - Internal combustion locomotive alternating current auxiliary generator excitation control device - Google Patents

Abstract

The invention discloses an internal combustion locomotive alternating current auxiliary generator excitation control device. Three-phase electricity output by an internal combustion locomotive auxiliary generator is input to the internal combustion locomotive alternating current auxiliary generator excitation control device, an output end of the internal combustion locomotive alternating current auxiliary generator excitation control device is connected with an end 1 of a controller, and an end 2 of the controller is connected with a locomotive storage battery. The internal combustion locomotive alternating current auxiliary generator excitation control device comprises a full-bridge rectifying circuit, a middle direct current circuit, a chopping power switch template, a control plate, an absorption circuit and a flywheeling diode. The internal combustion locomotive alternating current auxiliary generator excitation control device has the advantages that the auxiliary generator is good in voltage control effect and high in accuracy. The auxiliary generator excitation control device can rectify the three-phase electricity output by the auxiliary generator in a full-bridge mode so as to be small in effect on voltage of the auxiliary generator and high in wave coefficient. A chopping tube can work on the high frequency condition and is high in system response and high in adjusting accuracy on voltage of the auxiliary generator.

Description

Diesel locomotive exchanges auxiliary generator excitation control device

Technical field

The invention belongs to power electronic equipment, be specifically related to a kind of diesel locomotive and exchange auxiliary generator excitation control device.

Background technology

The China railways Secondary System of Diesel Locomotive adopts AC Drive at present, provides power supply by the locomotive AC auxiliary generator.Auxiliary generator adopts synchronous alternating-current generator, and auxiliary generator and diesel engine of locomotive synchronous rotary are controlled the auxiliary generator excitation, makes auxiliary generator output keep the U/f permanent character.

China's auxiliary generator excitation mainly contains 2 kinds of modes, phase control rectifier excitation mode and fixed excitation mode at present:

1) phase control rectifier excitation mode

The three-phase alternating current of auxiliary output is through the three-phase phase control rectifier, and the direct current that forms pulsation provides power supply to auxiliary excitation winding.And phase control rectifier output dc pulse senior general has influence on auxiliary three-phase alternating voltage form factor quality variation, also relates to the insulation life of auxiliary excitation winding simultaneously.

2) fixed excitation mode

The fixed excitation mode is to do the output voltage characteristic of locomotive AC auxiliary generator relatively softer, generally adopts the locomotive control electricity of locomotive storage batteries charger output directly to the power supply of auxiliary generator excitation winding.The auxiliary generator fixed excitation, making the auxiliary generator output voltage is not closed-loop control, and especially in load not simultaneously, auxiliary output voltage values can be different, make auxiliary generator output depart to a certain extent the U/f permanent character, unfavorable to the auxiliary system machine operation.

Summary of the invention

The present invention be directed to above shortcoming proposition a kind of effective to auxiliary voltage generator control, precision is high, responds fast device.

Technical scheme of the present invention is, a kind of diesel locomotive exchanges auxiliary generator excitation control device,

The three-phase alternating current that the diesel locomotive auxiliary generator sends inputs to diesel locomotive by input and exchanges auxiliary generator excitation control device, diesel locomotive exchanges auxiliary generator excitation control device output and is connected with 1 end of controller, 2 ends of controller are connected with locomotive storage batteries, also have following structure: the full bridge rectifier that the variable-frequency variable-voltage three-phase alternating current that combustion motor car auxiliary generator sends carries out rectification; Above-mentioned Rectified alternating current after rectification is carried out the intermediate dc loop of filtering, form galvanic current after filtering; The aforementioned stable direct current is carried out the copped wave power switch module of fixed frequency modulated PWM copped wave; Be connected with copped wave power switch module, be used for the control board of the above-mentioned copped wave power switch of conducting module device for power switching; Be used for absorbing the superpotential absorption circuit that produces in the device for power switching conducting of above-mentioned copped wave power switch module and closing process, in parallel with copped wave power switch module; When power device is closed in above-mentioned copped wave power switch module, provide the fly-wheel diode of continuous current circuit for auxiliary generator excitation winding electric current.

Advantage of the present invention: technology maturation is reliable, and auxiliary voltage generator is controlled effective, and precision is high.The auxiliary generator excitation unit carries out full-bridge rectification to auxiliary generator output three-phase alternating current, and with the phase control rectifier contrast, apparatus of the present invention are little on the impact of auxiliary voltage generator, and form factor is high; Copped wave power switch module can be operated under the upper frequency condition, and faster system response is high to the auxiliary voltage generator degree of regulation, makes auxiliary generator output can remain the U/f permanent character, has greatly optimized the auxiliary system working conditions of motor; Have simultaneously the failure excitation function, improve the reliability of locomotive.

Description of drawings

Fig. 1 is that diesel locomotive exchanges auxiliary generator excitation control device structural representation.

Fig. 2 is that diesel locomotive exchanges auxiliary generator excitation control device circuit diagram.

Be labeled as in figure: the D1-rectifier diode, the D10-fly-wheel diode, D11-copped wave diode, 101-control board, the Q1-device for power switching, C1-electric capacity, R1-resistance, LC1-auxiliary generator excitation winding, the QL1-controller, 1 end of 1-controller QL1,2 ends of 2-controller QL1, E-locomotive storage batteries.

Embodiment

Exchanging auxiliary generator excitation control device below in conjunction with the further combustion motor car of accompanying drawing describes.

This diesel locomotive exchanges auxiliary generator excitation control device, by full bridge rectifier, and intermediate dc loop, copped wave power switch module, control board, absorption circuit and sustained diode 10 compositions.The three-phase electricity that the diesel locomotive auxiliary generator sends is by input auxiliary generator excitation controlling device, diesel locomotive exchanges auxiliary generator excitation control device output and is connected with 1 end 1 of controller, 2 ends 2 of controller are connected with locomotive storage batteries E, the variable-frequency variable-voltage three-phase alternating current that full bridge rectifier combustion motor car auxiliary generator sends carries out rectification, adopt the three-phase bridge full bridge rectifier, by 6 rectifier diode D1(or diode (led) module) form; Filtering is carried out to above-mentioned Rectified alternating current after rectification in the intermediate dc loop, forms galvanic current after filtering, and the intermediate dc loop is comprised of filter C1; Copped wave power switch module is carried out fixed frequency modulated PWM copped wave to the aforementioned stable direct current, is composed in parallel by device for power switching Q1 and copped wave diode D10;Control board 101 is connected with copped wave power switch module, is used for controlling the switch of above-mentioned copped wave power switch module power device Q1, and control board is comprised of single-chip microcomputer and I/O element circuit; Absorption circuit is in parallel with copped wave power switch module, is used for absorbing the overvoltage that produces in above-mentioned copped wave power switch module power device Q1 switching process; When power device Q1 was closed in above-mentioned copped wave power switch module, sustained diode 10 provided continuous current circuit for auxiliary excitation winding electric current.In parallel with sustained diode 10 after controller QL1 and the series connection of auxiliary generator excitation winding, controller QL1 has 1 end and 2 ends, the output of fly-wheel diode is connected with 1 end 1 of controller QL1, and the input of sustained diode 10 is connected with the auxiliary generator excitation winding.The positive pole of storage battery E is connected with 2 ends of controller, and negative pole connects with the end that is connected with sustained diode 10 inputs of auxiliary generator excitation winding LC1.

Controller QL1 can be controlled by auxiliary excitation unit, completes excitation and the failure excitation function of auxiliary.Before the auxiliary generator generating, controller QL1 gets to 2 ends 2 of controller QL1, make locomotive storage batteries E voltage directly be added on auxiliary generator excitation winding LC1, for auxiliary generator is not controlled excitation, auxiliary generator generating this moment, its three-phase electricity of sending enters the auxiliary generator excitation unit after auxiliary excitation unit conversion, give auxiliary generator excitation winding LC1 power supply together with locomotive storage batteries E, controller QL1 gets to 1 end 1 afterwards, the auxiliary generator excitation just by auxiliary generator excitation unit oneself power supply, is completed auxiliary generator excitation process.When the auxiliary generator excitation unit breaks down, also controller QL1 can be got to 2 ends 2, carry out failure excitation, keep locomotive and substantially move, return to rear maintenance until locomotive.The requirement of generator failure excitation size auxiliary according to difference, can the connect power resistor of certain resistance of storage battery E carries out the dividing potential drop current limliting.

Claims (8)

1. diesel locomotive exchanges auxiliary generator excitation control device, the three-phase alternating current that the diesel locomotive auxiliary generator sends inputs to diesel locomotive by input and exchanges auxiliary generator excitation control device, diesel locomotive exchanges auxiliary generator excitation control device output and is connected with 1 end of controller, 2 ends of controller are connected with locomotive storage batteries, it is characterized in that having:

The full bridge rectifier that the variable-frequency variable-voltage three-phase alternating current that combustion motor car auxiliary generator sends carries out rectification,

Above-mentioned Rectified alternating current after rectification is carried out the intermediate dc loop of filtering, forms galvanic current after filtering,

The aforementioned stable direct current is carried out the copped wave power switch module of fixed frequency modulated PWM copped wave,

Be connected with copped wave power switch module, be used for the control board of the above-mentioned copped wave power switch of conducting module device for power switching,

Be used for absorbing the superpotential absorption circuit that produces in the device for power switching conducting of above-mentioned copped wave power switch module and closing process, in parallel with copped wave power switch module,

When power device is closed in above-mentioned copped wave power switch module, provide the fly-wheel diode of continuous current circuit for auxiliary generator excitation winding electric current.

2. diesel locomotive according to claim 1 exchanges auxiliary generator excitation control device, it is characterized in that: full bridge rectifier adopts the three-phase bridge full bridge rectifier, is comprised of 6 rectifier diodes (or diode (led) module).

3. diesel locomotive according to claim 1 exchanges auxiliary generator excitation control device, it is characterized in that: the intermediate dc loop is comprised of filter.

4. diesel locomotive according to claim 1 exchanges auxiliary generator excitation control device, and it is characterized in that: copped wave power switch module is comprised of device for power switching and copped wave diodes in parallel.

5. diesel locomotive according to claim 1 exchanges auxiliary generator excitation control device, and it is characterized in that: absorption circuit is composed in series by electric capacity and resistance.

6. diesel locomotive according to claim 1 exchanges auxiliary generator excitation control device, and it is characterized in that: control board is comprised of single-chip microcomputer and I/O element circuit.

7. diesel locomotive according to claim 1 exchanges auxiliary generator excitation control device, it is characterized in that: in parallel with fly-wheel diode after controller and the series connection of auxiliary generator excitation winding, the output of fly-wheel diode is connected with 1 end of controller, and the input of fly-wheel diode is connected with the auxiliary generator excitation winding.

8. diesel locomotive according to claim 1 exchanges auxiliary generator excitation control device, it is characterized in that: the positive pole of locomotive storage batteries is connected with 2 ends of controller, and negative pole connects with an end that is connected with the fly-wheel diode input of auxiliary generator excitation winding.

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