A five-phase inverter space vector modulation system and method with optimal switching loss

A technology of space vector modulation and five-phase inverter, which is applied in the control system, AC motor control, output power conversion device, etc. It can solve the problem that the switching loss of the inverter is not optimal, and the zero-voltage vector distribution phase is not fully utilized. Information and other issues

Active Publication Date: 2018-04-17
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

[0005] The traditional strategy is based on the idea of ​​continuous signal modulation, which theoretically does not make full use of the zero-voltage vector distribution method and the phase information of the current, so the switching loss of the inverter is not optimal

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  • A five-phase inverter space vector modulation system and method with optimal switching loss
  • A five-phase inverter space vector modulation system and method with optimal switching loss
  • A five-phase inverter space vector modulation system and method with optimal switching loss

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Embodiment Construction

[0070] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0071] Such as figure 1 As shown, the present invention provides a five-phase inverter space vector modulation system with optimal switching loss, including the following components:

[0072] The current signal acquisition unit is used to receive the phase current i of the five-phase inverter R ,i S ,i T ,i U ,i V ;

[0073] The first coordinate transformation unit is used to convert the current signal (i.e. the phase current i) under the aforementioned five-phase coordinate system ca ,i cb ,i cc ,i cd ,i ce ) into the current signal i in the two-phase stationary coordinate system 1 ;

[0074] The voltage signal acquisition unit is used to receive the DC voltage V of the five-phase inverter dc ;

[0075] A voltage sector judging unit, configured to calculate the voltage sector signal k according to the voltage signal in a giv...

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Abstract

The invention discloses a five-phase inverter space vector modulation method with optimal switching loss. The steps are: collecting the DC voltage of the five-phase inverter; The duty cycle of the four space voltage vectors; collect the phase current of the five-phase inverter and transform it into the current signal in the two-phase stationary coordinate system: calculate the first phase according to the current sector signal and the duty cycle of the four space voltage vectors The duty cycle of the first zero vector and the second zero vector; judging which sector the current voltage is in, according to the duty cycle of the first zero vector and the duty cycle of the four space voltage vectors and the corresponding switch sequence table according to the sector number Calculate the driving signals of the five bridge arm switch tubes. This method can achieve the optimal efficiency of the inverter from the perspective of control strategy without changing the hardware of the inverter. The invention also discloses a five-phase inverter space vector modulation system with optimal switching loss.

Description

technical field [0001] The invention belongs to the technical field of inverter modulation, in particular to a five-phase inverter space vector modulation system and modulation method with optimal switching loss. Background technique [0002] With the rapid development of power electronics technology and the improvement of control theory, it is a development trend to combine power electronics technology with control theory to control motor drive systems with high efficiency and high performance. With the in-depth research and wide application of the three-phase motor system, the development of industry and the construction of national defense have been greatly improved, but the inherent structure of the three-phase motor system has also exposed problems when solving practical industrial applications in some special occasions. How to continue to operate in the event of a failure without reducing the capacity of the system, and how to increase the capacity of the motor while i...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387H02P27/12
CPCH02M7/5387H02P27/12H02M1/0054Y02B70/10
Inventor 许海军卜飞飞黄文新刘皓喆
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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