Power take-off and power generation system for carrying tools such as road, rail and overwater tools

Abstract

The invention discloses a power take-off and power generation system for carrying tools such as road, rail and overwater tools. The power take-off and power generation system comprises an overall system, wherein the overall system is composed of one or more permanent magnet motors, zero or more storage batteries and a multi-input power converter; and the multi-input power converter is composed ofa three-stage circuit topology, a preceding-stage single-path input or multi-path input DC-DC boost / buck conversion circuit, an intermediate-stage power collection bus capacitor and a backward-stage DC-AC conversion circuit. The power take-off and power generation system has higher efficiency, reduces the influence on the driving force of a carrying tool to the maximum extent, can control the input power of one or more generators with different voltages, frequencies, phases and powers which are simultaneously accessed in real time so as to meet the requirement that primary power supplies withdifferent output characteristics are controlled to operate in parallel, can be connected with one or more storage battery packs at the same time, can control the power flow in real time according to the output power condition of the generator, achieves the energy storage and power compensation functions, adopts three-phase four-bridge-arm topological output, and has great phase shift load capacityand reactive power load capacity.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and is specifically applied to a new power generation system in which the main engine and auxiliary machines of vehicles such as highways, railways, and waterways or wheel axles take power to generate electricity during parking, especially during traveling. Background technique [0002] With the development of electrical and electronic equipment, various civil and military special vehicles and other vehicles have an increasing demand for electricity when parking or driving, and the existing power generation systems cannot meet the needs. [0003] 1. Technical background of on-board power generation [0004] a) Existing cars are equipped with claw-pole silicon rectifier generators, the output voltage is DC 28V, and the power is generally 3kW and 4kW. It is only for the vehicle itself, and cannot provide more power for on-board electrical equipment. IF AC; [0005] b) The existing gener...

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Problems solved by technology

[0004] a) Existing cars are equipped with claw-pole silicon rectifier generators, the output voltage is DC 28V, and the power is generally 3kW, 4kW, which is only used for the vehicle itself, and cannot provide higher power frequency / power for the on-board electrical equipment. Medium frequency alternating current;

[0005] b) Existing generating sets are generally large in size and heavy in weight, seriously occupying the load of vehicles. Except for a few low-power generating sets, most of them cannot be carried on the vehicle for auxiliary power generation;

[0006] c) Existing automotive engine power generation systems generally use excitation generators. In addition to their large weight and volume and low efficiency, the output frequency is limited by the engine speed, so they can only generate electricity at a constant speed while parking, and cannot supply power while driving; There is also the practice of using a permanent magnet generator. In addition to improving the power density, there is also the problem that the output voltage and output frequency change with the engine speed, and it can only be used for power generation when parking;

[0007] d) At home and abroad, there are attempts to use hydraulic motors to stabilize frequency to drive excitation motors for driving power generation schemes, but due to many problems such as volume, weight, speed adaptation range, output stability, etc., engineering applications cannot be implemented

[0008] 2. Technical background of train power generation without power access

[0020] 5) The AC inverter of photovoltaic power generation is a three-phase three-leg balanced output, and the off-phase load capacity is poor

Three-phase four-arm output is required for driving power generation, and the off-phase load capacity is super strong;

[0021] 6) The grid-connected output of photovoltaic power generation does not consider reactive power, and the output power factor of driving power generation can reach ±0.8;

[0035] In view of the above demand characteristics, it is impossible to use traditional power generation technology

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