Five-phase inverter model prediction current control method based on duty ratio optimization

A five-phase inverter and current control technology, applied in motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of difficult weight coefficient setting and complex algorithm implementation, and achieve easy digital realization, The effect of simplifying the evaluation function and reducing the current ripple

Pending Publication Date: 2020-08-28
CHENGDU YUNDA TECH CO LTD +1
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Problems solved by technology

However, the introduction of common-mode voltage constraints and the adjustment of weight coefficients make the algorithm complex, especially in the

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  • Five-phase inverter model prediction current control method based on duty ratio optimization
  • Five-phase inverter model prediction current control method based on duty ratio optimization
  • Five-phase inverter model prediction current control method based on duty ratio optimization

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Embodiment Construction

[0026] The present invention will be described in further detail below in combination with the accompanying drawings and specific implementation methods.

[0027] According to an embodiment of the present application, refer to figure 1 , The object of the invention is a five-phase two-level voltage source inverter. In the five-phase motor system, according to the extended Parker rotation transformation matrix, the symmetrical physical quantities in the natural coordinate system can be mapped to two orthogonal subspaces of α-β and x-y respectively, and the fundamental wave and 10k±1 (k=1,2 ,3…) harmonics are mapped to α-β space; 3rd and 10k±3 (k=1,2,3…) harmonics are mapped to x-y subspace; 10k±5 (k=1,2 ,3…) harmonics are mapped into the zero-sequence subspace, and this term always remains zero for star-connected five-phase symmetric loads.

[0028] Define the switch function as S i (i=a,b,c,d,e), S i = 1, the upper bridge arm is turned on; S i =0, the lower bridge arm is ...

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Abstract

The invention discloses a five-phase inverter model prediction current control method based on duty ratio optimization. The method specifically comprises the steps of selecting four adjacent large vectors of an alpha-beta subspace to synthesize a virtual voltage vector according to a specific duty ratio, and eliminating the harmonic voltage of an x-y subspace; selecting the virtual voltage vectorto construct a finite control set, and simplifying a prediction model and an evaluation function; estimating the action time of the virtual voltage vector in each control period, optimizing the duty ratio, and reducing current ripples; selecting two large vectors in opposite directions to be combined according to the same duty ratio, the volt-second value of each control period is adjusted, and therefore common-mode voltage is restrained; and designing and optimizing a switch sequence, and realizing average switching action times of each bridge arm. According to the invention, the common-modevoltage is reduced by 80% while the low-order harmonic current is effectively suppressed; and the evaluation function is simplified, the current tracking precision is improved, and the current ripplesare reduced.

Description

technical field [0001] The invention belongs to the field of design and manufacture of a five-phase motor AC control system in the field of power electronics and electric transmission, and in particular relates to a five-phase inverter model prediction current control method based on duty cycle optimization. Background technique [0002] Model predictive control has the advantages of simple and flexible control, low switching frequency and multi-objective optimization. One of the commonly used methods in the field, this method directly controls the current, the concept is intuitive and the implementation is simple, and it has become a research hotspot in the field of motor control. The classic FCS-MPCC estimates the current change trend at the next moment in each control cycle, selects the optimal vector according to the evaluation function, and applies the optimal vector to the next control cycle. However, most of the time, the error between the actual current and the refe...

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Application Information

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IPC IPC(8): H02P21/22H02P21/14H02P21/00H02P27/12H02M7/5387H02M1/12
CPCH02P21/22H02P21/14H02P21/0017H02P27/12H02M7/53871H02M1/12H02M1/123
Inventor 何鸿云宋文胜余彬陈溉泉王青元崔恒斌冯晓云李婷婷葛兴来
Owner CHENGDU YUNDA TECH CO LTD
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