A Switched Reluctance Generator Converter System

Abstract

Provided is a switch reluctance generator converter system. The system is composed of twelve diodes, seven switch tubes, two capacitors and three phase windings and is not provided with a special excitation source, two branches of each phase winding are in parallel connection during excitation and play a role of strengthening the excitation effect, while the excitation is carried out, electric power output can be achieved when the condition of the voltage of a first capacitor voltage higher than that of an output end is met, while electric energy is output in the power generation stage, the first capacitor providing the excitation electric energy is charged reversely; the whole system has the advantages that the extendibility and flexibility are strong, the loss is low, the quality of theelectric energy is high, and various small and medium power single-generator set systems are made to adapt to the load needing direct current power supply or the demand of direct current micro-grids.

Description

technical field [0001] The invention relates to the field of switched reluctance motors, in particular to a flexible, controllable, low-loss, high-reliability switched reluctance generator converter system that does not require an excitation power supply, can self-strengthen the excitation, and can output electric energy during both the excitation stage and the power generation stage. and its control methods. Background technique [0002] The structure of the switched reluctance motor is simple and strong, the manufacturing cost is low, there are no windings on the rotor, no permanent magnets, and the reliability is high; when used as a generator, one of the phase windings does not work without affecting the power output of the other phase windings, and the fault tolerance is strong ,have a broad vision of application. [0003] In recent years, DC transmission has been increasingly valued by the power sector. Local DC power grids have begun to take shape in some places. Hig...

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Problems solved by technology

[0005] The excitation, freewheeling and power generation of the switched reluctance generator must be realized around the operation control of the inverter circuit connected to its winding. Without the winding inverter circuit, the switched reluctance generator naturally has no meaning; when it comes to the inverter circuit, naturally The use of a large number of controllable power electronic switching tubes is indispensable. In the application of these switching tubes, the switching loss, especially the switching loss of high-frequency switching operation, is a major research problem in the industry. Excessive switching loss causes the loss of system power and low efficiency. , and increases the possibility of damage to the switching tube due to large losses and severe heat generation

[0006] Since the excitation stage is mainly to absorb electric energy, it is hoped that the excitation current can be established more quickly in a short time, that is, the excitation will be strengthened, so as to leave more time for the power generation stage and a larger initial current, and improve the power output capability. Based on this, the industry is currently It is often necessary to design a special excitation power supply to strengthen the excitation, but these enhanced excitation methods often need to be realized by adding a special excitation power supply with a controllable switch tube, which reduces the reliability of the system and increases the complexity of the control. When the excitation power supply fails, the entire switched reluctance generator will stop and cannot operate, so that the advantages of the switched reluctance generator with high fault-tolerant performance of power generation cannot be brought into play. If the excitation is strengthened inside the converter branch of each phase winding , this problem does not exist

[0007] The excitation stage of the switched reluctance generator has always been considered in the industry to be the stage of completely absorbing electric energy. Of course, so far, the excitation stage of the existing switched reluctance generator converter system at home and abroad is also purely absorbing electric energy. stage, a major consequence of this is that for a period of time (excitation stage) the output end does not receive electric energy, that is to say, the voltage and current at the output end fluctuate greatly

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