Method for implementing bi-level specific resonance-eliminating pulse-width modulation base on IGCT

Abstract

The invention relates to a method used for realizing two-level SHEPWM (specific harmonic eliminating pulse width modulation) on the basis of IGCT; corresponding switch pulse sequence is generated by modulation ratio m arranged from big to small; the forming format is memorized in a FLASH memory; a digital signal processor reads out the switch angle of 1 / 4 period corresponding to A phase in the FLASH memory according to the corresponding modulation ratio and the frequency parameter, symmetrically extends the angle to 360 DEG and constructs the switch angles for B phase and C phase; a timer is started after conversion calculation; in a timing breaking sub-program, the IGCT switch action time interval between three phases complies with the requirement after phase pulse width disposal. According to the switch characteristic of the IGCT, the design characteristic and the like of the output LC filter circuit, the method adopts specific harmonic elimination pulse width modulation to realize that the high-voltage frequency converter to have excellent output waveform in the whole output frequency section, and only needs to memory the switch angle data of 1 / 4 period of A phase at the same time, thus having small memory quantity.

Description

technical field [0001] The invention belongs to the technical field of power electronics applications, and in particular relates to an IGCT-based two-level specific harmonic elimination pulse width modulation implementation method. Background technique [0002] As a power electronics application technology, high-voltage frequency conversion technology converts high-voltage electricity with fixed frequency and amplitude into a voltage signal that can change frequency and amplitude arbitrarily, so that the electromagnetic torque generated by electric energy can be flexibly matched with the load high-voltage motor to obtain better Drive characteristics, and maximize the utilization of electrical energy. GE, ABB, ROBINCON, SIMENS and other large foreign companies and some domestic companies have high-voltage inverter products. The current specific harmonic elimination pulse width modulation method is mostly based on IGBT, but it requires a large switching angle data storage spac...

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Problems solved by technology

GE, ABB, ROBINCON, SIMENS and other large foreign companies and some domestic companies have high-voltage inverter products. The current specific harmonic elimination pulse width modulation method is mostly based on IGBT, but it requires a large storage space for switching angle data, and generally requires Store three-phase corresponding switch angle data, the data volume is large, and the processing and use are complicated

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