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Optimal Modulation Method for Five-leg Inverter

A modulation method and inverter technology, applied in control systems, control generators, vector control systems, etc., can solve problems such as low voltage utilization

Inactive Publication Date: 2016-03-30
NORTH CHINA UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0027] Aiming at the disadvantage of low voltage utilization in the traditional modulation strategy of the five-arm inverter in the background technology, the present invention proposes a new modulation strategy to optimize and adjust the voltage vector of the five-arm inverter and make full use of the five-arm inverter The zero-vector overlap time of the inverter modulates the inverter that is not working originally; the method includes the following steps:

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  • Optimal Modulation Method for Five-leg Inverter
  • Optimal Modulation Method for Five-leg Inverter
  • Optimal Modulation Method for Five-leg Inverter

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Embodiment Construction

[0053] 1. Modulation method to improve the voltage utilization rate of the five-arm inverter

[0054] The technical problem to be solved by the present invention is to provide a control strategy suitable for the above circuit, which can effectively improve the voltage utilization rate of the five-leg inverter and improve the load capacity of the five-leg inverter. The technical solution adopted by the present invention to solve the above technical problems is to use the zero-vector overlap time of inverter A and inverter B in the traditional modulation strategy to perform SVPWM modulation on the inverter that is originally in zero-vector.

[0055] Figure 4 From the traditional five-arm inverter PWM modulation strategy shown, it can be seen that in the first half of the sampling period, inverter A performs SVPWM modulation, and inverter B always maintains a zero vector. The work of inverter A can be divided into α 1 , β 1 and zero vector three segments. T 01 SVPWM modulat...

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Abstract

The invention discloses an optimizing and modulating method of a five-axle arm inverter, and belongs to the field of control of power electronics and electric drive. Due to the fact that the zero-vector overlapping time of the five-axle arm inverter is fully used for conducting optimization and adjustment on voltage vectors and is used for conducting modulation on a primary idle inverter, voltage using ratio of the five-axle arm inverter is effectively improved and loading-on capacity of the five-axle arm inverter is improved. Re-distribution is conducted on the voltage vectors of the five-axle arm inverter, times of simultaneous motion of a plurality of switches at a zero-vector moment are reduced, backward voltages of voltages of an output line of the inverter are effectively reduced, higher harmonic is lowered, and therefore voltage waveform quality of the output line of the five-axle arm inverter is improved.

Description

technical field [0001] The invention relates to a control method for a power electronic converter, in particular to a control method for improving the performance of a five-arm inverter driving a double asynchronous motor, especially a PWM modulation method for improving the voltage utilization rate of a five-arm inverter and optimizing the five-arm inverter PWM modulation method of inverter line voltage output. Background technique [0002] A simple electric drive system is mainly driven by an inverter to drive a motor to run with load and speed regulation. However, in many industrial applications such as textiles, papermaking, oil production, automobiles, and aerospace, most of them require multiple motors to run with load at the same time. , due to performance indicators, system redundancy, economic effectiveness and other requirements, multi-machine transmission systems are often used. The research shows that the five-leg inverter is used as the drive source, and a comm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/24H02P27/08H02P5/74H02M1/12H02M1/44H02P21/00
Inventor 梅杨李正熙
Owner NORTH CHINA UNIVERSITY OF TECHNOLOGY