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A method for calculating svpwm without angle and grid-connected inverter system

An angle-free, sector-free technology, applied in the direction of irreversible DC power input conversion to AC power output, single-network parallel feeding arrangement, output power conversion device, etc., which can solve problems such as large amount of calculation and complex algorithm.

Inactive Publication Date: 2015-11-25
XIHUA UNIV
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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a method for calculating SVPWM without angle and a grid-connected inverter system, aiming to solve the problems of complex algorithm and large amount of calculation existing in the traditional SVPWM algorithm

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  • A method for calculating svpwm without angle and grid-connected inverter system

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Embodiment Construction

[0089] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0090] The application principle of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0091] Such as figure 1 As shown, the method for the non-angle operation SVPWM of the embodiment of the present invention comprises the following steps:

[0092] S101: regard the three-level inverter as two levels, only consider the large vector and the zero vector, determine the large sector where the reference vector is located, and calculate the action time of each synthetic vector;

[0093] S102: Through simple comparison and calculation, the small sector i...

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Abstract

The invention discloses a non-angle operation SVPWM method and a grid-connected inverter system. The non operation SVPWM method includes the following steps that a three-level inverter is regarded as a two-level inverter, only the large vector and the zero vector are considered, a large fan zone where a reference vector exists is judged and action time of all resultant vectors is calculated; through simple comparison and calculation, a small fan zone in a three-level space vector diagram where the reference vector exists and action time of all the resultant vectors can be obtained. The three-level voltage source type grid-connected inverter system comprises a direct-current bus voltage control module, a reference current generating module and a non-angle operation SVPWM module. According to the non-angle operation SVPWM method and the grid-connected inverter system, power of the system can be controlled respectively and meanwhile, complete non-angle operation of the inverter system can be achieved. The two-level space vector is applied in modulation and converted into a three-level space vector in a linear mode and calculation of a trigonometric function is completely avoided, the calculation amount of the controller is greatly reduced, digitalization is facilitated and the non-angle operation SVPWM method and the grid-connected inverter system have obvious advantages in industrial application.

Description

technical field [0001] The invention belongs to the technical field of inverter digital control, and in particular relates to a method for calculating SVPWM without angle and a grid-connected inverter system. Background technique [0002] In recent years, with the combination of energy market and environment-friendly energy demand, the distributed generation system has been developed rapidly. Distributed power generation units include renewable and non-renewable energy sources, such as solar battery packs, wind power generators, and fuel generators. For the grid connection of renewable energy, power electronics technology plays a key role, especially for voltage source inverters. At present, in order to optimize the performance of the inverter control system and make the control easier, research on new control methods is becoming more and more intense. [0003] The continuous increase in rated power of equipment for medium and high voltage applications has stimulated the u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/483H02J3/38
Inventor 董秀成钟顺时王小龙
Owner XIHUA UNIV
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