Control method of duplex-winding high-power explosion-proof electric machine system based on IGCT five electrical levels

Abstract

The invention discloses a control method of a duplex-winding high-power explosion-proof electric machine system based on IGCT five electrical levels. The control method of the duplex-winding high-power explosion-proof electric machine system based on the IGCT five electrical levels includes the steps: setting set values of a rotating speed and a flux linkage, computing set values of a d-axis and a q-axis under a synchronous rotating coordinate system through a PI adjuster of the rotating speed and the flux linkage, accordingly acquiring an amplitude value of a reference voltage vector, and then acquiring a rotary reference voltage vector through transformation of coordinates; acquiring six-phase voltage needed by a duplex-winding motor through a five-electrical-level space vector pulse width modulation algorithm according to a set rotary reference voltage vector; and acquiring needed information of voltages, currents and the rotating speeds through a voltage, current and rotating speed detecting module, and acquiring information of the flux linkage and rotating angles through flux linkage observing. According to the control method of the duplex-winding high-power explosion-proof electric machine system based on the IGCT five electrical levels, compared with an inverter with two electrical levels and three electrical levels, the inverter has the advantages that harmonic content of voltages and currents is greatly reduced and harmonic orders are increased, wherein the voltages and the currents are output by the inverter, and the phenomenon that imbalance of two set winding currents is caused by inconsistency of winding parameters is avoided.

Description

technical field [0001] The invention belongs to the field of high-power variable-frequency AC speed regulation, and in particular relates to a control method for a dual-winding high-power explosion-proof motor system based on IGCT five-level, wherein the IGCT-based five-level inverter is combined with vector control technology Realize the control of the explosion-proof electric drive system of the double-winding high-power motor of the pipeline compressor. Background technique [0002] The topology of ordinary two-level inverters is relatively simple. In order to obtain high power, the switching devices are generally connected in series to withstand high voltage, and the switching devices are connected in parallel to withstand high current. However, due to the discrete type of power device parameters, it will bring a series of problems such as static and dynamic voltage equalization and current equalization. Uncertain factors in technology have a great influence, the reliab...

AI Technical Summary

Problems solved by technology

Technical uncertainties have a great influence, the reliability is not high, and the output is only two levels, the voltage fluctuates greatly, and large harmonics are generated

Therefore, the application range of this inverter structure is very limited.

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