Zero common-mode voltage modulation and input reactive power control method of direct matrix converter

A matrix converter, common mode voltage technology, applied in AC network voltage adjustment, reactive power compensation, reactive power adjustment/elimination/compensation and other directions, can solve the problems of complex calculation, uncontrollable input power factor, etc. Small, extended life, common mode current suppression effect

Active Publication Date: 2020-06-02
CENT SOUTH UNIV
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Problems solved by technology

However, the conventional modulation method using the rotation vector needs to judge the sector, and there are problems such as complex calculation and uncontrollable input power factor.

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  • Zero common-mode voltage modulation and input reactive power control method of direct matrix converter
  • Zero common-mode voltage modulation and input reactive power control method of direct matrix converter
  • Zero common-mode voltage modulation and input reactive power control method of direct matrix converter

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Embodiment Construction

[0047] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] As one of the embodiments of the present invention, this embodiment provides a modulation strategy for the common-mode voltage of a direct matrix converter and an input reactive power control method:

[0049] Such as figure 1 A modulation strategy of the common mode voltage of the direct matrix converter and a schematic diagram of the composition of the input reactive power control method in ...

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Abstract

The invention provides a zero common-mode voltage and input reactive power control method of a direct matrix converter, not only provides a space vector modulation method of the zero common-mode voltage of the direct matrix converter, but also provides a control method for controlling input reactive power on the basis of the modulation strategy. According to the modulation method, a clockwise rotation vector and an anticlockwise rotation vector are adopted at the same time, and expressions of the duty ratios of the vectors are given. The modulation method can achieve zero common-mode voltage of the direct matrix converter, common-mode current is effectively restrained, the service life of a motor is facilitated to be prolonged, and electromagnetic interference to surrounding equipment is reduced. According to the degree of freedom of the duty ratio in the modulation strategy, a control method for simply realizing input reactive power is provided. In addition, the control method provided by the invention does not need complex sector judgment; and the control method is small in calculation amount and suitable for practical application.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a zero-common-mode voltage modulation and input reactive power control method of a direct matrix converter. Background technique [0002] The direct matrix converter has been a research hotspot in the field of power electronics in the past ten years. It has many excellent characteristics, such as bidirectional energy flow, sinusoidal input and output currents, controllable input power factor, and no need for intermediate large-capacity energy storage links. Therefore, it has a wide range of applications in the fields of motor drive and wind power generation. [0003] However, matrix converters generate high frequency, high du / dt common-mode voltages at the neutral point of the motor load during operation. The common-mode voltage excites the stray inductance and coupling capacitance in the system, generates a large common-mode current, and generates elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/16H02J3/18
CPCH02J3/16H02J3/1842Y02E40/30
Inventor 孙尧谢诗铭粟梅林建亨王辉许国刘永露但汉兵熊文静
Owner CENT SOUTH UNIV
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