Voltage switching instruction based decoupling-coupling SVM demodulation method of matrix converter

Abstract

The invention relates to a voltage switching instruction based decoupling-coupling SVM demodulation method of a matrix converter. A bidirectional controllable switch circuit is decomposed to a one-way controllable switch circuit by means of a decoupling-coupling idea, and thus, the matrix converter can be decomposed to a positive group of general voltage type converters and a negative group of general voltage type converters; and with the adoption of a voltage type six-section space vector method, appropriate coupling logic synthesis is performed on the obtained SVM signal and a voltage positive-negative switching instruction signal to obtain flexible and independent control on the bidirectional switch of the matrix converter, thus, a three-phase voltage type non-isolation matrix rectifier achieves functions of AC input and DC output by a simple control logic, and the matrix converter can have functions of positive DC output and negative DC output. The method has the advantages that the control method is simple, the positive DC output voltage polarity and the negative DC output voltage polarity of the matrix rectifier can be achieved, the adaptability to a load is high, the DC voltage utilization rate is improved, the bidirectional flow of switching frequency energy is reduced, and a compact structure and high efficiency are achieved.

Description

technical field [0001] The invention relates to the field of modulation control of power electronic power converters, in particular to a matrix converter decoupling SVM modulation method based on voltage positive and negative switching instruction signals. Background technique [0002] A rectifier is a topological device that converts AC power into DC power. The voltage-type non-isolated matrix rectifier is evolved from the AC three-phase-three-phase converter. The voltage-type non-isolated matrix rectifier evolved on the basis of the matrix converter known as the universal converter. Compared with the traditional voltage-type PWM rectifiers have obvious advantages, such as wider voltage conversion range, output of positive and negative polarity voltage, stronger adaptability to load, bidirectional flow of energy, compact structure and high efficiency. [0003] However, due to the large number of switches in the matrix converter and the back-to-back connection of the bidire...

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Problems solved by technology

[0003] However, due to the large number of switches in the matrix converter and the back-to-back connection of the bidirectional switches, most of the control strategies are relatively complicated and most of them adopt the unified control of the bidirectional switches, which greatly reduces the flexibility of the control of the matrix converter. However, it is rare to realize the multi-polarity DC output of the voltage mode non-isolated matrix rectifier

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