Direct current inversion speed-control circuit of lithium battery locomotive

Abstract

The invention discloses a direct current inversion speed-control circuit of a lithium battery locomotive. a lithium battery power DC is connected to a direct current inverter IGPT by a resistance-capacitance filter LC and outputs frequency trigger signals to the direct current inverter IGPT, and the IGPT outputs three-phase alternating current balanced voltage to realize the speed control on an alternating current variable frequency motor JD; an advance / back control switch QF and a speed control potentiometer Wg form a control signal source, an electronic analog signal setter GDL outputs control information to a digital frequency arithmetic control unit CIM, and negative voltage and current feedbacks including current feedback FDI and voltage feedback FDU carry out automatic level control on output electrical parameters; and control signals of a touch screen CRD communicate with the numerical frequency arithmetic control unit CIM through a program controller PLC, process the assisted interlocking information and realize the display on the touch screen CRD. The high-energy high-current lithium battery has the beneficial effects of small volume, high energy storage capacity, low environmental pollution, superior performance, low carbon, energy saving and long service life, thereby being an ideal power supply for underground electric locomotives. By using electronic signals for variable-frequency speed control and using the three-phase alternating current variable-frequency motor for driving, the overall system realizes the leap from mechanical clutch power switch to numerical information control.

Description

technical field [0001] The patent of the present invention relates to a speed regulation circuit of an electric locomotive driven by a DC frequency conversion speed regulation system using a high-energy and high-power lithium battery as a power source. Background technique [0002] The electric locomotives used for underground coal mine transportation currently use lead-acid batteries as power sources. The disadvantages are: large volume, many consumables, low energy conversion efficiency, distilled water and sulfuric acid are often added during use, and flammable and explosive hydrogen gas is generated. Great environmental pollution, unsafe. In addition, mine electric locomotives generally use resistance or chopper DC speed regulation systems. The system is outdated in technology and consumes high energy materials. The first is that the resistors connected in series for resistor speed regulation consume a lot of energy, wasting precious energy in vain, and the heat genera...

AI Technical Summary

Problems solved by technology

[0002] The electric locomotives used for underground coal mine transportation currently use lead-acid batteries as power sources. The disadvantages are: large volume, many consumables, low energy conversion efficiency, distilled water and sulfuric acid are often added during use, and flammable and explosive hydrogen gas is generated. Pollution to the environment, unsafe

The system technology is outdated, high energy consumption materials

One is that the resistors connected in series for speed regulation by resistors consume a lot of energy, wasting precious energy in vain, and the heat generated by them will cause harmful failures to instruments, wires, and mechanical operating surfaces.

The second is that the structure of the DC motor is complex, it uses a lot of copper, the process is difficult, and the cost is high; the current exchange adopts a carbon brush structure, and the carbon brush and commutator are prone to sparks, which is unsafe; the commutator is easy to wear and deform, and there are many faults during use. Large quantity, high maintenance cost

The third is the polarized speed regulation of the DC system. The switching of the switch to the DC working current produces current arcing and burns out the switch; frequent sudden changes in current have a great impact on the life of the motor; sudden changes in the speed of the locomotive during operation cause shocks to the machinery , the mechanical device is easily damaged

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