Direct boost variable power generation voltage variable excitation non-isolated switch reluctance generator conversion system

Abstract

A direct boost variable power generation voltage variable excitation non-isolated switch reluctance generator conversion system is formed by nine diodes, nine switch tubes, a three-phase winding, fourcapacitors, and three inductors. During each phase winding excitation and power generation operation, a power generation voltage value is naturally increased. Through a fifth switch tube (a first phase winding, other corresponding ones), continuously changing power generation voltages can be further obtained. Through a ninth switch tube which is the only switch tube, under the condition that an isolation link is not needed, continuously variable excitation voltages can be acquired and can directly participate in power generation output. Simultaneously, a storage battery is abandoned and an excitation design is reinforced. Based on that, a problem that a power generation voltage is continuously adjusted by the conversion system is solved, and an excitation voltage directly affects an output power generation voltage; controllability is enhanced; and with a simple structure and control, flexibility and adaptability of the system are greatly improved. The system is suitable for various low-power compact high-speed switch reluctance generator system fields.

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, which directly raise the generating voltage, the generating voltage is adjustable, the excitation voltage is adjustable, there is no isolation link and no battery common ground. Background technique [0002] Among the mainstream motors, the switched reluctance motor has the simplest and strongest structure, and has no winding on the rotor and guide bars to dissipate heat, so the cost should be the lowest, and it should have broad application prospects, including being used as a generator, compared with permanent magnet synchronous The cost of generators has been greatly reduced. However, the current research and application development on it is relatively slow. The key reason is that its converter system is immature and has not yet reached the level of large-scale finalized application. ...

AI Technical Summary

Problems solved by technology

[0002] Among the mainstream motors, the switched reluctance motor has the simplest and strongest structure, and has no winding on the rotor and guide bars to dissipate heat, so the cost should be the lowest, and it should have broad application prospects, including being used as a generator, compared with permanent magnet synchronous The cost of generators has been greatly reduced. However, the current research and application development on it is relatively slow. The key reason is that its converter system is immature and has not yet reached the level of large-scale finalized application. Especially when it is used as a generator, it can be seen that the converter system The core position of the system in the switched reluctance generator system

[0003] When the switched reluctance generator is running, the windings of each phase are independently energized according to the relative position information of the stator and rotor, and the fault tolerance is good. However, the poor controllability of the current converter system in the industry is one of the factors hindering its development. In addition to the switching angle and winding current variable at low speed, the rest such as power generation voltage and excitation voltage cannot be adjusted through its own converter system, while the input excitation voltage and output power generation voltage are key performance parameters. Therefore, a huge It hinders its maximum power tracking output and the improvement of power generation efficiency and benefits, especially in wind power and other new energy fields that emphasize power generation efficiency and benefits, which greatly hinders the application of switched reluctance generator systems. There are some in the system industry, but either the adjustment range is too narrow, or it cannot be completely decoupled from the power generation voltage, and the interference is large, or some do not have the above problems, but require more complex variable excitation circuit systems such as isolation transformers and multiple switch tubes. Relying on the switched reluctance generator converter system to adjust the power generation voltage, there are very few in the industry at present, and some concepts have been proposed, but either cannot be verified in depth, or the range of change is limited, the change method is single, and often requires a special converter structure and its control to achieve

[0004] In most switched reluctance generator systems currently used, the voltage required by the user, that is, the load side, is often higher than the direct output voltage of the traditional switched reluctance generator, thus requiring a special booster device and control system. The converter system only performs its own excitation and power generation output, and the entire system has a complex structure, which is also one of the problems hindering the application of the switched reluctance generator system. The power electronic system is too complex, and the reliability is bound to be low and the cost is high. Considering the extensive use of devices such as isolation and transformers, the volume and weight occupy a large area, which greatly affects the expansion of the application field of the system

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