Self-strong excitation bidirectional high-voltage gain interleaved switch reluctance motor power converter system

Abstract

A self-strong excitation bidirectional high-voltage gain interleaved switch reluctance motor power converter system comprises a main circuit, an excitation power supply and a bidirectional DC-AC-DC, wherein the main circuit, the excitation power supply and the bidirectional DC-AC-DC are mutually connected. The main circuit is simple in structure, and each phase winding is divided into two branchesconnected in parallel, so that the effect of enhanced excitation is achieved. The storage battery of the excitation power supply has an automatic charging function, and the bidirectional DC-AC-DC ensures that the switched reluctance motor can generate power when operating clockwise and electrically operates in counterclockwise direction. The functions of isolation, high-frequency transformation and high voltage gain is provided. The interleaved control mode during electric operation in counterclockwise direction can reduce the torque pulse. The system is more suitable for power generation / electric operation in different time period.

Description

technical field [0001] The invention relates to the field of motor systems, in particular to a switched reluctance motor power converter system for both power generation and electric motoring and a control method thereof. Background technique [0002] The switched reluctance motor has a simple and solid structure, low manufacturing cost, high performance in a wide speed range, no winding on the rotor, no permanent magnet, high reliability, and broad application prospects. [0003] Switched reluctance motors generally have 2-5 phase windings placed on the stator, and the phase windings that are energized are determined according to the relative position of the salient poles between the stator and rotor; when operating as a generator, it is slightly complicated, and each phase winding generally needs to be divided It is two stages of excitation and power generation. In the excitation stage, the phase winding of the motor absorbs the electric energy of the external excitation p...

AI Technical Summary

Problems solved by technology

[0005] In the excitation control of switched reluctance generators, the strengthening of the excitation phase is a hot research topic in recent years. The most typical example is the Z-source network converter proposed by Professor Peng Fangzheng. There are also other strengthening methods in the industry, such as these, most of them rely on separately increasing the external circuit to strengthen and increase the excitation voltage, so that the excitation current in the excitation phase rises faster and the time is shorter, and then there is a larger phase current before the power generation phase begins, and relatively more The wide power generation stage range makes the difference between the output electric energy in the power generation stage minus the electric energy consumed in the excitation stage is larger, that is, the output power is larger, but the external strengthening of the excitation circuit will inevitably make the structure complex, increase the complexity of the control, and reduce the reliability. sex

[0006] As for the starting solution of the switched reluctance generator, the industry often adds a battery series diode branch in front of the main circuit of the power converter. Large, it is necessary to check the power of the battery from time to time and replace the battery or charge it manually, which increases the cost of operation and maintenance

[0007] At present, in some fields, including the fields where switched reluctance motors have been applied, they will be required to adapt to the dual-mode operation of electric / power generation according to needs, that is, they can be operated as generators according to instructions, and can also be switched to motor conditions according to needs. If When the motor and generator are running, different power converters are used and switched according to needs, which will inevitably greatly increase the complexity of the structure. Therefore, the same set of power converters can flow bidirectional electric energy and ensure electric / generating operation, which will be very useful. future

[0008] As a switched reluctance generator, for example, as a power generation supply device in a microgrid network, or as a power supply for high-voltage load devices, the generated voltage directly output by the switched reluctance generator through the traditional power converter system is often too low to meet the requirements of the output side. Therefore, if the boost function is taken into account in the power converter system, the structure will inevitably be simplified

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