Hybrid power system and control method thereof

Abstract

The invention discloses a hybrid power system and a control method thereof. The hybrid power system comprises an engine, a brushless doubly-fed motor and a frequency conversion device, wherein the engine is connected with a load, and the brushless doubly-fed motor is indirectly connected with the load by connecting the engine in series; the brushless doubly-fed motor is adopted to replace a permanent magnet motor, and a power winding and a control winding of the brushless doubly-fed motor can perform frequency conversion and speed regulation at the same time so that the speed regulation range is wider; the super capacitor and the storage battery are used for supplying power at the same time, and the discharging performance and the power storage capacity can be guaranteed; when the winding on one side goes wrong, the winding can be opened to control an asynchronous motor, so system safety is improved; due to existence of the super capacitor, the power winding is a high-voltage winding, and circuit loss can be reduced; the brushless doubly-fed motor is a dual-port motor, a control winding and a power winding can be controlled at the same time, control schemes are diversified, and power and cruising ability can be better optimized.

Description

technical field [0001] The invention belongs to the technical field of vehicle power systems, and in particular relates to a hybrid power system and a control method thereof. Background technique [0002] With the popularization of the concept of green life, more and more types of pure electric or other new energy vehicles are used worldwide. Among them, vehicles such as buses and taxis have been able to better use new energy power. Due to the large differences in vehicle gross weight and operating conditions, the application of pure electric technology for heavy-duty transport vehicles is still in the initial stage. There are currently three types of power schemes in urban transport vehicles. One is internal combustion engine power, which will be used for heavy-duty vehicles with large total mass or long operating mileage; the second is pure electric power, which will be applied to vehicles with small total mass or short operating mileage; Moderate quality and operating ...

AI Technical Summary

Problems solved by technology

[0004] 1) The magnetic circuit structure and design calculation are relatively complex, and the material processing is difficult;

[0005] 2) The problem of constant voltage control, it is difficult to weaken the magnetic field at high speed;

[0006] 3) Severe heat generation during high-speed operation, which may easily lead to loss of magnetism;

[0007] 4) The cost problem, the price of permanent magnet materials and the difficulty of processing, have increased the overall cost

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