Electric vehicle mounted power generation system and control method thereof

Abstract

The invention discloses an electric vehicle mounted power generation system. A dual-salient pole brushless direct-current power generator is adopted in the electric vehicle mounted power generation system, thus system structure is simplified and system cost is reduced. In the invention, a controller working power supply and an inside excitation source in the dual-salient pole brushless direct-current power generator is used as a power supply of a power generator controller, thus power supply safety of the generator controller is improved. The invention also discloses a control method of the electric vehicle mounted power generation system. By adopting an output current constant-current regulation and voltage-limit combined coordination control policy, power matching and system protection of a power generation system, a power storage battery and a drive system can be realized, system energy consumption is optimized and service life of the power storage battery pack is prolonged.

Description

technical field [0001] The invention relates to a power generation system, in particular to an electric vehicle vehicle power generation system and a control method thereof. Background technique [0002] With the global energy shortage and the aggravation of environmental pollution, the automobile industry has been severely tested and challenged by energy and environmental factors. The development of electric vehicles is the best way to solve the energy crisis and environmental pollution. Pure electric vehicles are driven by electric motors and use the electric energy of the on-board power battery pack as power. It is the ultimate choice to replace internal combustion engine vehicles and meet zero emissions. However, due to the limitation of the construction of charging stations and the performance of vehicle power battery packs, it is difficult for pure electric vehicles to be recognized by the market due to the restriction of driving range. In the process of developing to...

AI Technical Summary

Problems solved by technology

In the three-phase AC brushless synchronous motor, the air gap magnetic field of the three-phase AC brushless synchronous generator is easy to adjust, and there is no brush and slip ring, which realizes brushless. The disadvantage is that the brushless makes the motor structure complicated, due to the loss of electric excitation. presence, poor efficiency and power density

The asynchronous generator in the asynchronous motor power generation system is simple in structure, low in price, and easy to maintain, but the asynchronous generator needs to provide reactive power from the outside to realize power generation, and there is a problem of difficulty in voltage regulation and frequency regulation, the control method is complicated, and the cost of the whole system is high.

In the permanent magnet motor power generation system, the permanent magnet synchronous generator does not need excitation windings and DC excitation sources, and has high efficiency and power density. However, the motor is excited by permanent magnets, and it is difficult to adjust the air gap magnetic field and control its output voltage.

When the permanent magnet synchronous generator is used for power generation, an external power converter is required, which increases the cost of the system and the complexity of control

As a national strategic resource, rare earth permanent magnet materials are strictly restricted in mining and sales. With the rising price of rare earth permanent magnet materials, the manufacturing cost of permanent magnet motors continues to increase, which makes the cost of permanent magnet motor power generation systems rise.

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