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

A space vector modulation, five-phase inverter technology, used in control systems, AC motor control, output power conversion devices, etc., can solve the problem that the inverter switching loss is not optimal, and the zero voltage vector is not fully utilized to allocate phases. information, etc.

Active Publication Date: 2016-03-02
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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  • Five-phase inverter space vector modulation system and method with optimal switching loss
  • Five-phase inverter space vector modulation system and method with optimal switching loss
  • Five-phase inverter space vector modulation system and method with optimal switching loss

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Embodiment Construction

[0069] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0070] like figure 1 As shown, the present invention provides a five-phase inverter space vector modulation system with optimal switching loss, including the following components:

[0071] 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 ;

[0072] 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 ;

[0073] The voltage signal acquisition unit is used to receive the DC voltage V of the five-phase inverter dc ;

[0074] A voltage sector judging unit, configured to calculate the voltage sector signal k according to the voltage signal in a...

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Abstract

The invention discloses a five-phase inverter space vector modulation method with an optimal switching loss. The five-phase inverter space vector modulation method comprises the following steps: collecting a direct current voltage of a five-phase inverter; calculating duty ratios of four space voltage vectors according to a voltage sector signal, a first frequency voltage setting and a second frequency voltage setting; collecting a phase current of the five-phase inverter, and converting the phase current into current signals under a two-phase static coordinate system; calculating the duty ratios of a first zero vector and a second zero vector according to a current sector signal and the duty ratios of the four space voltage vectors; and judging in which sector the current voltage is located, and calculating drive signals of five bridge arm switch tubes according to the duty ratio of the first zero vector, the duty ratios of the four space voltage vectors and a switching sequence table corresponding to the sector number. According to the method, the optimal efficiency of the inverter is achieved from the angle of a control strategy on the basis of not changing hardware of the inverter. The invention further discloses a five-phase inverter space vector modulation system with the 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 Applications(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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