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Algebraic modulation method of three-phase current type converter

A three-phase current, modulation method technology, applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, which can solve problems such as complex performance optimization

Pending Publication Date: 2022-06-17
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

However, compared with space vector modulation, the above carrier modulation scheme is more complicated in terms of performance optimization

Method used

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  • Algebraic modulation method of three-phase current type converter
  • Algebraic modulation method of three-phase current type converter
  • Algebraic modulation method of three-phase current type converter

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Embodiment Construction

[0059] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments:

[0060] The invention provides an algebraic modulation method for a three-phase current-mode converter, and proposes a new type of algebraic modulation framework, which can realize the optimization of performance indicators through the selection of free variables and the arrangement of switching sequences, and solves the problem of complex optimization of the existing carrier modulation performance. , space vector modulation computationally complex problems.

[0061] figure 1 It is a working flow chart of an algebraic modulation method for a three-phase current-mode converter of the present invention, figure 2 The topology structure of the bidirectional three-phase current-mode converter of the present invention is as follows, including an input AC voltage source 1, an input inductor 2, an input capacitor 3, a switch network 4, a DC ...

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Abstract

The invention discloses an algebraic modulation method of a three-phase current type converter, and aims to convert a duty ratio distribution problem into a solving problem of a non-homogeneous linear equation set. The method comprises the following specific steps: firstly, constructing a non-homogeneous linear equation set of the duty ratio according to a system mathematical model, and solving a general solution of a duty ratio matrix by virtue of a linear algebraic correlation theory; secondly, according to the physical constraint of the duty ratio, obtaining a feasible solution range of a free variable by means of a geometric method; then, one point is selected from the feasible solution region to serve as a value of a free variable, and a final duty ratio matrix is determined; and finally, reasonably arranging a switch action sequence according to specific performance requirements (low loss, low common-mode voltage, low direct current ripple and the like), and obtaining driving pulses of each switch. According to the modulation method, trigonometric function calculation is avoided, the system operation cost is saved, and the modulation method has the advantages of being easy to implement, high in flexibility and high in universality.

Description

technical field [0001] The invention belongs to the technical field of AC power conversion devices, and relates to an algebraic modulation method of a three-phase current-mode converter. Background technique [0002] The inherent short-circuit protection, adjustable power factor, and ease of regeneration of current-mode converters make them attractive in industrial applications such as medium-voltage drives, distributed generation systems, and high-voltage direct current (HVDC) systems. Especially for the application of distributed power generation system, the current-mode converter only needs one conversion to convert the DC voltage of the distributed power generation system (such as solar energy and fuel cells) to the grid-connected AC voltage. Therefore, the excellent characteristics of the current source type converter make it attract more and more attention. [0003] The modulation strategy directly affects the performance of the current-mode converter. The current ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217H02M1/088H02M1/12H02M1/14
CPCH02M7/217H02M1/088H02M1/12H02M1/14
Inventor 熊文静蒋枋楠刘厅易书栋林建亨孙尧粟梅韩华刘永露宁光富
Owner CENT SOUTH UNIV
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