Comparative study of two repetitive process control techniques for a grid-tie converter under distorted grid voltage conditions

Jackiewicz, Krzysztof; Straś, Andrzej; Ufnalski, Bartłomiej; Grzesiak, Lech M.

doi:10.1016/j.ijepes.2019.05.003

Cited by 10 publications

(5 citation statements)

References 33 publications

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“…The reference signal is generated, which corresponds with the ideal increment of the position of 200 steps/revolution motor for a given microstepping resolution. This pair of signals (reference position and actual position) is then treated as input (reference position) and output (actual position) of the I I nd order damped oscillator [18][19][20] given by continuous transfer function (7). The choice of I I nd order system is inferred from [20].…”

Section: Resultsmentioning

confidence: 99%

Influence of Microstepping Signal Shape on Shaft Movement Precision and Torque Variation of the Stepper Motor

2021

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Stepper motors are widely used in many applications where discrete, precise movement is required. There is a variety of dedicated stepper motor controllers (sometimes referred to as “step sticks”) available on the market. Those controllers provide a number of different motor control schemes that vary by aspects like current control method, reference current shape or maximum resolution increase (microstepping). The two most widely acknowledged signal shapes are sine-cosine microstepping and quadrature microstepping. The choice of the control scheme impacts torque output, torque variation, positioning error and maximum power supply requirements. This paper presents a family of generalised microstepping signal shapes, ranging from sine-cosine microstepping to quadrature microstepping. Derivation of signal shapes as well as their mathematical analyses are provided. Those signals are then implemented on the control board. A series of experiments is performed on a test bench to analyse the influence of different signal shapes on the performance of the motor in both load and no load conditions. The comparison of the new generalized shapes influence on the motor operation to the commonly used sine-cosine and quadrature control is provided.

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Section: Resultsmentioning

confidence: 99%

Influence of Microstepping Signal Shape on Shaft Movement Precision and Torque Variation of the Stepper Motor

2021

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“…This has two major consequences: both controller types experience the same problems of lack of robustness, oscillatory transients and sensitivity to frequency variations, but at the same time it is reasonable to infer that all improving modifications frequently reported for practical resonant controllers should have their counterparts in the case of the repetitive controller. However, this fact seems to be overlooked and most control engineers in the field of power electronics tend to implement a set of oscillatory terms instead of one universal periodic signal generator -even if the latter seems to be more straightforward and imposes less computational burden [20].…”

Section: Practical Repetitive Controllermentioning

confidence: 99%

Bulletin of the Polish Academy of Sciences: Technical Sciences

Ufnalski¹,

Straś²,

Grzesiak³

2021

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The paper features a grid-tied converter with a repetitive current controller. Our goal here is to demonstrate the complete design workflow for a repetitive controller, including phase lead, filtering and conditional learning. All key parameters, i.e., controller gain, filter and fractional phase lead, are designed in a single optimization procedure, which is a novel approach. The description of the design and optimization process, as well as experimental verification of the entire control system, are the most important contributions of the paper. Additionally, one more novelty in the context of power converters is verified in the physical system -a conditional learning algorithm to improve transient states to abrupt reference and disturbance changes. The resulting control system is tested experimentally in a 10 kW converter.

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“…It imply the compensation of several harmonics is not an excessive computational burden for the converter operating with 10 kHz switching frequency and overall time available for calculation of 100 µs. The implementation details are presented in [6]. To highlight the contribution of oscillatory terms, first, the results for the control structure without oscillatory terms are presented in Fig.…”

Section: Experimental Studymentioning

confidence: 99%

“…Elimination of grid current distortion, understood as current unbalance and high content of higher harmonics, is a major area of interest in the field of control of power electronic converters operating under distorted voltage conditions [1][2][3][4][5][6][7]. Generally, the frequency spectrum of grid voltage disturbances is recognized.…”

Section: Introductionmentioning

confidence: 99%

“…Two main approaches to cope with periodic disturbances for grid connected converters include the concept of repetitive control or control structures with oscillatory terms (resonant controllers). Examples of implementation of the repetitive controller for AC/DC converters are presented in [11][12][13] and an attempt to compare these approaches is given in [6,14]. A slightly different approach based on the virtual electromagnetic torque has been proposed in [15,16].…”

Section: Introductionmentioning

confidence: 99%

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Bulletin of the Polish Academy of Sciences: Technical Sciences

Gałecki

Michalczuk

Kaszewski

et al. 2020

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The paper presents a three-phase grid-tied converter operated under unbalanced and distorted grid voltage conditions, using a multi-oscillatory current controller to provide high quality phase currents. The aim of this study is to introduce a systematic design of the current control loop. A distinctive feature of the proposed method is that the designer needs to define the required response and the disturbance characteristic, rather than usually unintuitive coefficients of controllers. Most common approach to tuning a state-feedback controller use linear-quadratic regulator (LQR) technique or pole-placement method. The tuning process for those methods usually comes down to guessing several parameters. For more complex systems including multi-oscillatory terms, control system tuning is unintuitive and cannot be effectively done by trial and error method. This paper proposes particle swarm optimization to find the optimal weights in a cost function for the LQR procedure. Complete settings for optimization procedure and numerical model are presented. Our goal here is to demonstrate an original design workflow. The proposed method has been verified in experimental study at a 10 kW laboratory setup.

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Comparative study of two repetitive process control techniques for a grid-tie converter under distorted grid voltage conditions

Cited by 10 publications

References 33 publications

Influence of Microstepping Signal Shape on Shaft Movement Precision and Torque Variation of the Stepper Motor

Influence of Microstepping Signal Shape on Shaft Movement Precision and Torque Variation of the Stepper Motor

Bulletin of the Polish Academy of Sciences: Technical Sciences

Bulletin of the Polish Academy of Sciences: Technical Sciences

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