Novel five-level inverter seven-segment type SVPWM modulation method

A modulation method, seven-segment technology, applied in the field of seven-segment SVPWM modulation of five-level inverters, can solve the problems of lack of detailed research and few solutions for the digital implementation of SVPWM algorithm

CN103457502AInactive Publication Date: 2013-12-18HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2013-12-18
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a novel five-level inverter seven-segment type SVPWM modulation method. The method mainly comprises the steps of sector distinguishing, sector rotating and normalizing, small triangular area distinguishing, vector function time calculating, seven-segment vector output signal control signal generating, seven-segment three-phase voltage space-vector outputting and dead zone controlling and decoding. The novel five-level inverter seven-segment type SVPWM modulation method has the advantages that a five-level inverter SVPWM algorithm is easy to understand, calculation is simplified greatly through the sector normalizing processing, and due to the fact that no trigonometric function calculation is contained in the whole achieving process of the algorithm, digitization is convenient to achieve. The algorithm is easy to achieve regardless of whether a DSP or an FPGA is adopted, the algorithm can be expanded to the SVPWM modulation of more level inverters easily, and the novel five-level inverter seven-segment type SVPWM modulation method has important practical value to an alternating current variable frequency system.
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Description

technical field

[0001] The invention relates to the field of power electronics, in particular to a seven-segment SVPWM modulation method for a five-level inverter. Background technique

[0002] Compared with traditional two-level inverters, multi-level inverters have advantages such as flexible control methods, low harmonic content of output voltage, high inverter efficiency, and are suitable for high-voltage and high-power output, and have been widely accepted by the society. focus on. In recent years, diode-clamped three-level inverters have been widely used in the fields of medium and high voltage, high-power frequency conversion and speed regulation, and power active filtering. However, if you want to obtain higher output voltage and higher output power, you need to apply a multi-level inverter that can output more levels and a higher voltage level.

[0003] There are several kinds of PWM pulse width modulation technologies for multi-level inverters. Among them, the sp...

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Embodiment Construction

[0040] Further illustrate the present invention below in conjunction with accompanying drawing.

[0041] The present invention avoids complex trigonometric function operations, simplifies calculations, and is easy to implement digitally. Its main features are as follows:

[0042] A. Use twelve rules to judge the specific position of the reference voltage in the space voltage vector diagram. The twelve rules are as follows:

[0043] Rule One: U refβ ≥3U β

[0044] Rule 2: 3U β ≥U refβ ≥2U β

[0045] Rule Three: 2U β ≥U refβ ≥U β

[0046] Rule Four: U refβ ≥U β

[0047] Rule five: U refβ ≥ 3 ( U refα - U α )

[0048] Rule six: 3 ( U refα - U ...