Modulation Method of Cascaded Three-phase Frequency Converter
A modulation method and frequency converter technology, applied in the field of power electronics, can solve the problems of increasing system volume and cost, and achieve the effects of improving total harmonic distortion, protecting insulation, and reducing motor terminal overvoltage
Active Publication Date: 2021-08-06
DELTA ELECTRONICS (SHANGHAI) CO LTD
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If a dv / dt filter is used to suppress the overvoltage at the motor end, it will increase the system size and cost
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[0045] Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.
[0046] Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided in order to give a thorough understanding of embodiments of the invention. However, those skilled in the art will appreciate that the technical solutions of the present invention may be practiced without one or mor...
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The present invention provides a modulation method of a cascaded three-phase frequency converter, comprising: obtaining a plurality of basic space voltage vectors according to the switching tube state and output level of a power unit in each stage; The basic space voltage vector is divided into large vector, medium vector, small vector and zero vector; multiple basic space voltage vectors are arranged into a vector space, and the vector space is divided into multiple sectors, where each sector corresponds to a Group large vector, medium vector, small vector and zero vector; determine the sector where the reference voltage vector is located, and the reference voltage vector is synthesized by a group of vectors corresponding to the sector where it is located; calculate the large vector, medium vector, and The action time of the small vector and the zero vector; assign the action sequence of the large vector, the medium vector, the small vector and the zero vector; generate the three-phase modulated wave signal according to the action sequence and action time; switch signal.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a modulation method of a cascaded three-phase frequency converter. Background technique [0002] With the development of power electronics technology, frequency converters are widely used in various power electronics systems due to their advantages of high efficiency and energy saving. At present, in order to meet the needs of high-voltage and high-power power electronic systems, people gradually start to use cascaded three-phase inverters. [0003] The most commonly used modulation scheme for cascaded inverters is unipolar frequency multiplication modulation. Its advantages are: the module outputs PWM waves of 0 and +1 in the positive half cycle of the output voltage, and outputs PWM waves of 0 and -1 in the negative half cycle. , and the frequency of the module output voltage is twice the switching frequency of the power device. [0004] figure 1 It is a schematic ...
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IPC IPC(8): H02M5/458
CPCH02M5/458H02M1/007H02M7/483H02P27/12H02P29/0241H02M7/53876H02P1/26H02P27/04
Inventor 陈凯赵文江郎永强包彼得
Owner DELTA ELECTRONICS (SHANGHAI) CO LTD