Method for solving specific harmonic cancellation pulse width modulation inverter switching angle

A technology of specific harmonic elimination and switching angle, which is used in instruments, special data processing applications, electrical digital data processing, etc. It can solve the problems that the local optimal solution cannot guarantee the global optimality, and the inverter performance cannot be guaranteed.

Inactive Publication Date: 2013-09-25
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

Moreover, there may be multiple local extreme points in a specific harmonic elimination equation group, and the local optimal solution obtained by the numerical algorithm cannot be guaranteed to be the global optimal solution, so the performance of the inverter cannot be guaranteed to be optimal.

Method used

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  • Method for solving specific harmonic cancellation pulse width modulation inverter switching angle
  • Method for solving specific harmonic cancellation pulse width modulation inverter switching angle
  • Method for solving specific harmonic cancellation pulse width modulation inverter switching angle

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Embodiment Construction

[0023] Some specific examples are given below regarding the technical solution adopted by the present invention. It should be noted that the described examples are only intended to facilitate the understanding of the present invention, and do not limit it in any way.

[0024] Such as figure 2 Shown is the flow chart of the solving method of SHEPWM inverter switching angle of the present invention, mainly comprises the following steps: the harmonic elimination equation system is transformed into polynomial equation group; Its groebner basis is calculated to polynomial equation group; Only contain one in the solution groebner basis Variable polynomial equations, and eliminate the real solutions that do not meet the constraint conditions; according to the number of variables from the least to the most, they are substituted in order to solve the remaining polynomial equations, and the real solutions that do not meet the constraint conditions are eliminated; finally, the harmonic e...

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Abstract

The invention relates to a method for solving a specific harmonic cancellation pulse width modulation inverter switching angle. The method comprises the steps of firstly utilizing a trigonometric function duplication formula and a variable substitution for converting a harmonic cancellation equation set into a polynomial equation set, and solving a groebner base of the polynomial equation set; then, sequentially substituting variables into equations for solving the groebner base according to the number of the variables from small to large, and removing real solutions which do not conform to constraint conditions until all the equations are solved; finally, solving an anti-cosine to obtain the switching angle, evaluating the harmonic cancellation effect of the switching angle, and obtaining the globally optimal solution of the switching angel. The method is compared with a current frequently-used numerical algorithm, an initial value is not required to be given, all the real solutions of the harmonic cancellation equation set can be calculated, finally, the globally optimal solution is obtained, and the method has important value for practicality of a specific harmonic cancellation inverter.

Description

technical field [0001] The invention relates to the field of power electronic equipment, especially inverters, in particular to a method for solving switching angles of a Selective Harmonic Eliminated Pulse Width Modulation (SHEPWM) inverter. [0002] Background technique [0003] Specific Harmonic Elimination Pulse Width Modulation (hereinafter referred to as SHEPWM) technology is different from traditional waveform modulation PWM technology, it is a method to obtain the switching angle through mathematical calculation. Compared with the inverter using sinusoidal pulse width modulation technology, the inverter using SHEPWM technology has the characteristics of low switching frequency, small switching loss and high waveform quality. Due to the elimination of low-order harmonics, the remaining harmonics are mostly concentrated in high frequencies, which can greatly reduce the requirements for filters. In addition, higher voltage gains can be obtained to save energy. Such as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 杨克虎卫炜
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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