A switched reluctance generator converter and its control method

Abstract

The invention discloses a switched reluctance generator converter and a control method thereof. The converter is composed of a converter main circuit and a self-excitation variable-excitation circuit,and totally comprises a three-phase winding, seven switching tubes, eleven diodes, eight capacitors, an inductor and one resistor; branch windings of each phase winding of the converter main circuitare connected in parallel during excitation of each phase winding, and are automatically connected in series during power generation; an output voltage is increased; the negative electrodes of the converter main circuit and the self-excitation variable-excitation circuit are in a common ground state; input and output currents of the self-excitation variable-excitation circuit are not interrupted during operation, and an output excitation voltage of the self-excitation variable-excitation circuit can be adjusted through a duty ratio of the seventh switching tube; other switching tubes except the seventh switching tube are all in a single pulse wave switching mode; and therefore, the whole converter can be strengthened and diversified in excitation, and is high in input and output electric energy quality, high in output voltage, low in switching loss, simple and convenient to control and suitable for the fields of various switched reluctance generator systems, especially high-speed low-power switched reluctance generator systems.

Description

technical field [0001] The invention relates to the field of switched reluctance generator systems, in particular to a switched reluctance generator converter with self-enhanced variable excitation, common ground for excitation and power generation, low switching loss, and high power quality, and a control method thereof. Background technique [0002] Switched reluctance generators have received more and more attention in recent years, but their high reliability, low cost, and simple and sturdy motor body cannot cover up their high requirements for converters. Without converters, the motor will not work. [0003] The operation of each phase winding of the switched reluctance generator is divided into an excitation stage and a power generation stage, which are carried out in time-sharing. The excitation stage absorbs electric energy, and the power generation stage releases electric energy. Therefore, the shorter the excitation stage time and the faster the excitation current c...

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Problems solved by technology

[0002] Switched reluctance generators have received more and more attention in recent years, but their high reliability, low cost, and simple and sturdy motor body cannot cover up their high requirements for converters. Without converters, the motor will not work

[0003] The operation of each phase winding of the switched reluctance generator is divided into an excitation stage and a power generation stage, which are carried out in time-sharing. The excitation stage absorbs electric energy, and the power generation stage releases electric energy. Therefore, the shorter the excitation stage time and the faster the excitation current can be established, it is bound to improve the power generation. There are many ways to strengthen the output capacity and excitation. For example, the excitation voltage can be adjusted according to the needs, and the excitation voltage can be increased to strengthen the excitation. This requires a special excitation circuit. At present, most of the excitation circuits and the main inverter circuit The space often needs to be isolated, which will inevitably increase the cost and the complexity of the structure and control

[0004] Moreover, since the excitation circuit is mostly in self-excitation mode, when the current at the input end of the excitation circuit is intermittent, it will cause interference to the output side of the generator. If the current at the output side of the excitation circuit is intermittent, the excitation performance will be greatly reduced. Mode Although the power is stable, the cost of manual maintenance is too high

[0005] Various types of converters must use a large number of switching tubes. Switching loss has become a problem that must be paid attention to in this field at present, which will greatly reduce the conversion efficiency and reliability. It is bound to increase the complexity of the structure and control and reduce the reliability

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