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Fixed-frequency finite set model prediction control method for two-level three-phase inverter

A three-phase inverter, finite set model technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output and other directions, can solve problems such as high sampling frequency and increase hardware burden, and achieve high precision High, speed up the operation speed, the effect of increasing the switching frequency

Active Publication Date: 2018-10-23
SOUTH CHINA UNIV OF TECH
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  • Application Information

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Problems solved by technology

This method is simple and effective, while retaining the fastness, but the sampling frequency is much higher than the reference switching frequency, which greatly increases the burden on the hardware

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  • Fixed-frequency finite set model prediction control method for two-level three-phase inverter
  • Fixed-frequency finite set model prediction control method for two-level three-phase inverter
  • Fixed-frequency finite set model prediction control method for two-level three-phase inverter

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with specific examples.

[0026] like figure 1 and figure 2 As shown, the fixed frequency finite set model predictive control method for the two-level three-phase inverter provided in this embodiment is specifically implemented as follows:

[0027] 1) Assuming that the circuit is a linear load, the filter inductance on the AC output side is L, the resistive load is R, the ABC three-phase parameters are equal, and the system sampling frequency is F s , then the period is T s =1 / F s . The switching function S in the three-phase ABC static coordinate system is defined as S={Sa, Sb, Sc}, when the upper bridge arm of each phase is turned on, S i (i=a, b, c)=1, when the lower bridge arm is turned on, S i (i=a, b, c)=0; we can get a total of 8 switching functions S, that is, S=[000; time, the last sampling time is k-1 time.

[0028] 2) Transform the mathematical model of the two-level three-phase inv...

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Abstract

The invention discloses a fixed-frequency finite set model prediction control method for a two-level three-phase inverter. According to the method based on improvement of the traditional finite set model prediction control method, each real discrete voltage vector is equally divided into N parts; and 8N parts of reference voltage vectors are synthesized into a virtual voltage vector. The optimal virtual voltage vector is obtained by real-time calculation by the reference voltage vector in a 60-degree coordinate system instead of virtual vector table traversing; the obtained optimal virtual vector is multiplied by a unique time matrix of a located section; and thus a proportion of acting time of a real switch vector to a switch cycle is calculated, wherein the proportion is an integral multiple of 1 / 2N. A PWM modulator generates a switch change-over signal and the fixed switch frequency is realized; and the control precision is improved.

Description

technical field [0001] The invention relates to the technical fields of power electronic conversion technology, intelligent control and two-level three-phase inverters, in particular to a fixed-frequency finite set model predictive control method for two-level three-phase inverters. Background technique [0002] The traditional finite set model predictive control only acts on one real switching vector in one switching cycle, but the real switching vector and the reference voltage vector cannot be completely equal, there must be an error, and this error will eventually be reflected on the output current. To eliminate the error, the sampling frequency must be increased, but the increase in the sampling frequency will lead to an increase in switching loss, which creates a pair of contradictions. In addition, because there is no correlation between the control between two adjacent switching periods, the traditional finite set model predictive control converter has the disadvanta...

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Application Information

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IPC IPC(8): H02M7/5387H02M7/483
Inventor 杜贵平蒋超雷雁雄
Owner SOUTH CHINA UNIV OF TECH