Experimental study of the VFD’s speed stabilization efficiency under torque disturbances

Kodkin, Vladimir L.; Anikin, A. S.

doi:10.11591/ijpeds.v12.i1.pp80-87

Cited by 5 publications

(12 citation statements)

References 11 publications

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“…The traditional method for assessing the quality of rotation speed stabilization is experiments with a stepwise change in the load torque [23]- [26]. The processes of parrying surges of "stepwise" load in a drive with VCS shown in Figure 1(a) have no significant advantages over processes in a drive with SCS as shown in Figure 1(b)), neither the time of the transient process, nor the value of the "drawdown" of the rotation speed.…”

Section: Problem Definitionmentioning

confidence: 99%

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Experimental study of the VFD's speed stabilization processes under torque disturbances

Kodkin

Anikin

2023

IJPEDS

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<span lang="EN-US">Maintaining speed with various jumps and changes in load torque is one of the main tasks of variable frequency drives (VFD). The article considers the operation of the VFD under the influence of periodic perturbations of variable frequency and amplitude. The dependence of the transient function of the VFD and the family of frequency characteristics associated with it on the frequency of the stator voltage and slip underlies the methodology for experimental studies of such drives. The traditional method is based on the response to harmonic stimulation and works well for a non-linear system. In the course of the work, it was found that the introduction of dynamic positive feedback (DPF) allows to compensate for disturbances of varying frequency and amplitude. Experiments with a sinusoidal change in the load torque have shown the effectiveness of introducing the DPF in front of conventional sensorless control systems (vector and scalar).</span>

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Section: Problem Definitionmentioning

confidence: 99%

“…A drive with dynamic positive torque feedback (active component of the stator current) has higher rates of speed stabilization and load parrying in Figure 2(b). The operation of such control is described in detail in the [26]- [28].…”

Section: Problem Definitionmentioning

confidence: 99%

Experimental study of the VFD's speed stabilization processes under torque disturbances

Kodkin

Anikin

2023

IJPEDS

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“…In the works [5][6][7][8][9][10][11], a nonlinear transfer function was proposed linking the mechanical torque developed by the SCIM and the absolute slip-the difference between the frequency of the stator voltage and the speed of rotation of the engine. The formula of this function includes, as variables, the frequency of the stator voltage and the relative slip.…”

Section: Mathematics Describing Modes Of Operationmentioning

confidence: 99%

“…The formula can be called a nonlinear transfer function or a dynamic Kloss formula. In the articles [5][6][7][8], the conclusion of the proposed nonlinear transfer function is given in sufficient detail, the result is as follows:…”

Section: Mathematics Describing Modes Of Operationmentioning

confidence: 99%

Experimental Studies of Asynchronous Electric Drives with “Stepwise” Changes in the Active Load

Kodkin¹,

Anikin²,

Baldenkov³

et al. 2022

Control Systems in Engineering and Optimization Techniques

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The article offers the results of experimental studies of asynchronous electric 10 motors with “squirrel cage” rotor with frequency control. The results of bench tests of the modes of parrying stepwise changes in the load created by a similar frequency-controlled electric drive are presented. A preliminary qualitative analysis of the known control methods is carried out and it is shown that the assumptions made when creating their algorithms in the modes of countering the load become too significant. The reasons for this are the fundamental inaccuracies of the vector equations of asynchronous electric motors with frequency regulation. The proposed interpretation of asynchronous electric motors by nonlinear continuous transfer functions, outlined in the articles written by the same authors earlier, and the corrections they proposed turned out to be more accurate for the operating modes under consideration than the traditional methods of interpretation and correction of the frequency control of asynchronous electric motors This made it possible to assess as objectively as possible the effectiveness of the interpretation of asynchronous electric drives and methods of their regulation. Numerous articles on this topic over the past 25–30 years have not provided such results.

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“…Drive equations used to derive control algorithms are generalized equations of IMD with a very large number of simplifications and assumptions, the main being the assumption of the sinusoidal nature of all currents and magnetic fluxes in the motor [5,[10][11][12][13]. The accuracy of torque control in such electric drives, as follows from experiments [5,11,[14][15][16][17][18], is not very high, especially for sensorless regulation (that is, for the vast majority of IMD). There are many methods to refine vector control, which FC manufacturers are in no hurry to implement.…”

Section: Introductionmentioning

confidence: 99%

On the Physical Nature of Frequency Control Problems of Induction Motor Drives

Vladimir

Anikin

2021

Energies

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This article considers the possibility of connecting the problems of the engineering synthesis of frequency control systems for induction motor drives (IMD) with the theory of the identification of IMD based on the equations of a generalized AC electric machine. The article presents experimental studies of load parrying in IMD with vector (VC) and scalar (SC) controls. These results indicate the absence of fundamental advantages in a drive with VC. This advantage should manifest in a more efficient formation of the moment and fast transients. A method was proposed for describing IMD by nonlinear transfer functions, making it possible to formulate the principle of the correction of IMD and a method for assessing their efficiency. The article shows that the correction based on the proposed nonlinear transfer functions of the induction motor is much more efficient than the traditional VC, which was confirmed by detailed experiments and modeling. The most important results are given in the article. An assumption was made that the efficiency advantage was due to more accurate identification of the dynamics of an IMD with a gear function instead of vector equations.

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Experimental study of the VFD’s speed stabilization efficiency under torque disturbances

Cited by 5 publications

References 11 publications

Experimental study of the VFD's speed stabilization processes under torque disturbances

Experimental study of the VFD's speed stabilization processes under torque disturbances

Experimental Studies of Asynchronous Electric Drives with “Stepwise” Changes in the Active Load

On the Physical Nature of Frequency Control Problems of Induction Motor Drives

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