Hybrid Fractional Repetitive Control for Magnetically Suspended Rotor Systems

Cui, Peiling; Wang, Qirui; Zhang, Guoxi; Gao, Qian

doi:10.1109/tie.2017.2752119

Cited by 41 publications

(17 citation statements)

References 25 publications

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“…The CP unit overcomes digital sampling delay. However, it introduces the high frequency perturbation i L , and from (13), it can be written as (15).…”

Section: Proposed Virtual High Frequency Damping Methods a Vhd Dmentioning

confidence: 99%

“…However, when constructing s 2 term, the impedance expression also changed. And from (13), it can be derived as:…”

Section: B Operation Principle Of the Vhd Algorithmmentioning

confidence: 99%

“…However, the control structures are becoming complex with the increasing number of resonant frequencies in the PR controllers, which requires that the digital controllers have higher performance [12]. Repetitive controllers are popular for its ability to regulate a series of harmonics components, while its dynamic response and frequency adaptability need to be improved in the grid-connected system [13], [14]. There are many literatures focus on the predictive control to overcome the digital delay and achieving precise current control with minimum distortion and harmonic noise, but the methods need the good knowledge of the system parameters [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

An Active High Frequency Damping Scheme for the Current Control of L Filter-Based Grid-Connected Inverter

et al. 2019

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A virtual high frequency damping (VHD) method is proposed in this paper for the improving of L filter-based grid-connected inverter's stable margin as well as its output current waveform performance. The precise frequency domain model of system, which involves pulse width modulation (PWM) and digital control delay, is sophisticated studied. Based on which, the quantitative relationship between the proportional (P) control gain and the inductance value as well as the digital control delay is revealed, and the system global control gain margin is obtained. Furthermore, the stability problems caused by the larger value of control gain under the traditional control method and a current sampling prediction (CP) method are studied, respectively. Therefore, the guidelines for the designing of system's virtual damping is provided, and VHD method as well as its phase compensation approach are thereby proposed to attenuate the oscillation of system output current, in particular of the high frequency oscillation, and to improve system performance in terms of expanding the current loop operating bandwidth and increasing the system stable margin. The simulation and experimental results both clearly validate the correctness and feasibility of the proposed VHD method. INDEX TERMS Active damping methods, current control, digital control, harmonics, stability.

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“…The CP unit overcomes digital sampling delay. However, it introduces the high frequency perturbation i L , and from (13), it can be written as (15).…”

Section: Proposed Virtual High Frequency Damping Methods a Vhd Dmentioning

confidence: 99%

“…However, when constructing s 2 term, the impedance expression also changed. And from (13), it can be derived as:…”

Section: B Operation Principle Of the Vhd Algorithmmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

An Active High Frequency Damping Scheme for the Current Control of L Filter-Based Grid-Connected Inverter

et al. 2019

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“…At each time step, the current command to a control system is adjusted based on the error seen in the previous period. A difficulty is that performance of conventional RC (CRC) can be very sensitive to accurate knowledge of the period, and to any fluctuation of that period with time [11]. In CRC one can only adjust the overall gain to influence the sensitivity.…”

Section: Introductionmentioning

confidence: 99%

A Novel Second Order Repetitive Control That Facilitates Stability Analysis and its Application to Magnetically Suspended Rotors

et al. 2019

Self Cite

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Repetitive control is an effective method to eliminate the effects of a periodic disturbance on a control system. In some applications the period is not known with sufficient accuracy, or the period may fluctuate sufficiently to seriously compromise performance. Second order repetitive control has been developed in response to this issue. Existing methods of analyzing stability for such systems are either very difficult to use, or excessively conservative sufficient conditions. A novel second order repetitive control is proposed here which achieves the behavior of second order but uses data from only one period in the past. This better meets the requirements for real time storage, but more importantly, it allows us to develop a stability criterion that is much less conservative. The experimental results demonstrate that the suppression effect can achieve a high level under frequency fluctuation with the proposed control method.

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“…Another problem is how to achieve frequency adaptability of RC with the constant sampling frequency. Related fractional RCs are given based on Lagrange interpolation [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

CRC and NHPWM method for test bench based on cascaded converter

Yang

Shao

et al. 2019

IET Power Electronics

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This study describes a megawatt test bench based on the cascaded converter for the stability test of renewable energy generation system under different grid disturbances. The test bench is composed of two cascaded converters, which are used to control the output of fundamental voltage and harmonic voltage. Aiming at the defects of the traditional repetitive controller (RC) and hybrid pulse-width modulation (HPWM) method, configurable RC (CRC) and novel HPWM (NHPWM) method are presented. By flexibly configuring the zeros and poles of CRC, the harmonic order that can be tracked accurately and the time delay of CRC can be easily changed. Besides, with NHPWM, the number of modules modulated by carrier phaseshifted PWM can be arbitrarily configured according to the output voltage quality and switching loss. Therefore, the flexible CRC and NHPWM are beneficial to achieve high control accuracy of fundamental and harmonic voltage and fast dynamic response while considering the switching loss, which is verified by simulation. The detailed harmonic analysis and calculation method of NHPWM are given, which are also proved correct by comparison of theoretical calculation and simulation results.

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Hybrid Fractional Repetitive Control for Magnetically Suspended Rotor Systems

Cited by 41 publications

References 25 publications

An Active High Frequency Damping Scheme for the Current Control of L Filter-Based Grid-Connected Inverter

An Active High Frequency Damping Scheme for the Current Control of L Filter-Based Grid-Connected Inverter

A Novel Second Order Repetitive Control That Facilitates Stability Analysis and its Application to Magnetically Suspended Rotors

CRC and NHPWM method for test bench based on cascaded converter

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