A Doubly-fed Switched Reluctance Generator Converter System

Abstract

A double-fed switched reluctance generator converter system, which is composed of a storage battery, a converter main circuit, an excitation charging and energy feeding circuit, and an output capacitor. , each phase circuit itself can directly realize the functions of high voltage output and enhanced excitation at the same time, and the excitation charging and energy feeding circuit can realize charging, excitation, reverse energy feeding and adjustable functions at the same time, taking into account to obtain a good charging excitation The power quality and backfeed voltage, and the isolation and decoupling of the power generation output and the excitation, so that the invention solves the excellent effect of integrating and compounding a set of converter systems to directly realize multiple functions, and is suitable for switched reluctance under various driving powers Applications in the field of generator systems.

Description

technical field [0001] The invention relates to the field of switched reluctance motor systems, in particular to a switched reluctance generator converter system and a control method thereof, in which a converter main circuit directly outputs high voltage, an excitation circuit can be automatically charged, and energy can be fed back. Background technique [0002] Because of its simple and firm structure, no winding on the rotor, convenient heat dissipation, high reliability, and strong fault tolerance, the switched reluctance motor has a wide range of application prospects. [0003] In the working of switched reluctance generator, it is generally divided into two stages: excitation and power generation. In the excitation stage, it is often hoped that the required winding current can be established as soon as possible, so as to leave enough time for the subsequent stage of power generation to generate output. By increasing the excitation Voltage enhanced excitation is a mean...

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Problems solved by technology

[0003] In the working of switched reluctance generator, it is generally divided into two stages: excitation and power generation. In the excitation stage, it is often hoped that the required winding current can be established as soon as possible, so as to leave enough time for the subsequent stage of power generation to generate output. By increasing the excitation Voltage enhanced excitation is a means, but it often requires a separate excitation circuit with adjustable excitation voltage, which increases the complexity of structure and control

[0004] The excitation methods of switched reluctance generators generally include separate excitation and self-excitation. The excitation of the external excitation mode is stable and does not affect the output terminal, but the maintenance cost is high and requires a separate excitation power supply such as a battery. The self-excitation mode does not require a separate power supply. The separately excited type has the disadvantages of frequently replacing the battery, etc., but in the conventional self-excitation mode, it will generally cause large fluctuations at the output end, and at the same time, the input excitation power is unstable and the power quality is low. At present, there are self-excitation with a special excitation circuit. A type structure converter system can realize the decoupling of the output side of the power generation and the excitation voltage, thereby avoiding this problem, but the excitation circuit can only function as a single excitation power supply, and needs to work together with the main power generation circuit at the same time. The battery is used as the excitation power supply. If the excitation circuit is only responsible for charging the battery at the same time, the problem of the long-term uninterrupted follow-up work of the excitation circuit can be solved. However, the output side of the excitation circuit has higher requirements, because it is more efficient and safe to charge the battery. Charge

[0005] In most applications of switched reluctance generators, it is often necessary to increase the voltage through a special booster circuit after generating output to meet the requirements, which greatly increases the complexity of structure and control, making reliability and efficiency Decrease, or take advantage of the difference in the converter circuit of each phase winding of the switched reluctance generator, and directly boost the voltage in series after each output, but this structure faces the problem of low power quality at the output side

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