Optimal Double-Halfbridge Pulse Width Modulation by Current-Dispersion Criterion

Belousov, I. V.; Samoseiko, Veniamin F.; Saushev, Alexander V.

doi:10.1109/iwed.2019.8664344

Cited by 2 publications

(4 citation statements)

References 7 publications

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“…Получим аналитические оценки дисперсии тока нагрузки для однофазной модуляции на однофазной нагрузке. Согласно работам [13], [14] локальная дисперсия тока зависит от моделирующей функции полумоста g X , коэффициента смещения импульсов относительно центра интервала модуляции Da X и приближенно может быть представлена в виде…”

Section: результаты (Results)unclassified

“…При этом рассмотрим наиболее распространенный в практике случай, когда напряжение на нагрузке изменяется по синусоидальному закону. Согласно данным работы [14] будем полагать, что модулирующая функция полумоста A определяется выражением…”

Section: результаты (Results)unclassified

“…В работах [12]- [14] установлено, что коэффициенты смещения импульсов относительно центра интервала модуляции Da X , функция предмодуляции g 0 , а также период ШИМ T 0 определяют набор свободных переменных. Таким образом, задача оптимального управления системой преобразователь -электродвигатель сводится к определению свободных переменных таким образом, чтобы добиться минимума локальной дисперсии тока.…”

Section: методы и материалы (Methods and Materials)unclassified

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Optimal Pulse Width Modulation in the Electric Drive Control System

Belousov

Samoseiko

Saushev

2022

jour

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The process of pulse width modulation (PWM) in the converter - electric motor system is considered. It is noted that the main task of pulse-width modulation of the voltage generated by the electron-key converter in the converter - electric motor system is to reduce current pulsations during the modulation period. It is proved that the dynamic process of changing the current in an electric machine on the PWM period can be approximated by an R, L-filter. It is established that the most important task of PWM is to minimize the current modulation error in the electric motor. The analysis of possible criteria for assessing the quality of the modulation process in electric drive control systems is carried out. It is shown that as an optimality criterion for assessing the quality of modulation in a converter - electric motor system, it is advisable to use an integral quadratic criterion of relative error, called local current dispersion, as well as the average value of local current dispersion over the period of the modulating function, called integral current dispersion. The process of single-phase modulation on a single-phase load is considered. Analytical estimates of the load current dispersion for this process are obtained. A condition, under which the current dispersion takes a minimum value, is recorded. The efficiency of pulse-width modulation optimization by the criterion of current dispersion is investigated. The average dispersion of currents in the load with a centrally symmetric arrangement of pulses on the modulation interval is taken as the base value of the dispersion. An expression that allows us to evaluate the efficiency of optimizing the current dispersion, taking into account the increment of the center of the modulation interval, is obtained. The dependence illustrating the efficiency of optimization by the criterion of pulse displacement relative to the center of the PWM interval on the relative frequency of modulation at different amplitudes of the modulating voltage is constructed. An expression is obtained for estimating the average value of the local current dispersion over the half-period of the modulating function.

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Section: методы и материалы (Methods and Materials)unclassified

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Optimal Pulse Width Modulation in the Electric Drive Control System

Belousov

Samoseiko

Saushev

2022

jour

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“…It follows that the current dispersion is proportional to the modulation power loss in the motor winding. In [12][13][14] issues of optimal pulse width modulation in inverter-motor system according to the criterion of minimum current dispersion in the load are considered. At the decision of these tasks the necessary condition is the estimation of filtering properties of drive motors as a part of electric drive.…”

Section: Introductionmentioning

confidence: 99%

Assessment of filtering properties of asynchronous electric drive with pulse width modulation

Belousov

Samoseiko²,

Saushev³

2022

E3S Web Conf.

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The process of pulse-width modulation in the converter-motor system is considered. It is noted that the main task of pulse width modulation of voltage formed by the electronic key converter in the converter-motor system is to reduce current pulsations during the modulation period. It is established, that the dynamic process of current change in the electric machine during the period of pulse-width modulation can be approximated by R, L filter. It is shown, that the most important task of pulse-width modulation is minimization of modulation error by current in electric motor. The analysis of possible criteria of estimation of modulation process quality in control systems of electric drive is carried out. It is noted that as a criterion of optimality to assess the quality of modulation in the converter-electromotor system, it is advisable to use the integral quadratic criterion of relative error, called the local variance of the current, as well as the average value of the local variance of the current at the period of the modulating function, called the integral variance of current. The process of estimating the filtering ability of electric machines as part of the electric drive is considered. A system of basic values based on nominal values of electric motor stator voltage, its nominal angular speed and nominal stator current has been selected. The index of filtering properties of the load considering introduction of basic values has been proposed. The equations of an asynchronous electric machine with constant coefficients in the complex form of writing are given. The dependency of the real part of roots of the characteristic equation for an asynchronous machine as a function of angular speed of the rotor rotation is constructed. An analytical expression for the estimation of the filtering properties of asynchronous machines is obtained. The comparison of different types of electric machines according to this parameter is made.

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Optimal Double-Halfbridge Pulse Width Modulation by Current-Dispersion Criterion

Cited by 2 publications

References 7 publications

Optimal Pulse Width Modulation in the Electric Drive Control System

Optimal Pulse Width Modulation in the Electric Drive Control System

Assessment of filtering properties of asynchronous electric drive with pulse width modulation

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