Average Periodic Delay-Based Frequency Adaptable Repetitive Control With a Fixed Sampling Rate and Memory of Single-Phase PFC Converters

Baek, Seunghoon; Cho, Younghoon; Lai, Jih‐Sheng

doi:10.1109/tpel.2020.3035527

Cited by 19 publications

(5 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Time delay is an inherent problem of digital control system. In the existing technologies, the delay time T d always is approximately 1.5 T s , where T s is sampling period [22, 23]. T d can be divided into two parts, one is calculation delay T cal , the other is the modulation delay T PWM .…”

Section: Coupling Characteristic Analysismentioning

confidence: 99%

Complete decoupling compensation of three‐phase inverter with LCL filter in synchronous reference frame

Shi

Huang

Zheng

2022

IET Power Electronics

View full text Add to dashboard Cite

A decoupling control strategy of three‐phase inverter, which can realize complete decoupling of the active and reactive current in the synchronous reference frame (SRF) is proposed here. There are two coupling factors of current loop in SRF, one is time delay caused by digital control, and the other is AC filter. Dynamic time delay compensation is applied to eliminate coupling caused by the first factor. The phase of the bridge leg voltage can be predicted. The difference between it and the phase of reference voltage which takes part in pulse width modulation (PWM) is the dynamic compensation angle, which can compensate the time delay. High‐order feedforward compensation is applied to eliminate coupling caused by the second factor. Complex vector model of the LCL filter is derived and the high‐order coupling coefficients can be offset by feedforward compensation. The coupling characteristics and compensation principles are analysed in detail. The system stability is discussed. Finally, the simulation and experimental results are given to verify the theoretical analysis.

show abstract

Section: Coupling Characteristic Analysismentioning

confidence: 99%

Complete decoupling compensation of three‐phase inverter with LCL filter in synchronous reference frame

Shi

Huang

Zheng

2022

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…However, in many industrial or cost-effective applications, the usage of wide bandgap devices is not suitable and hence, alternative control solutions must be adopted to take advantage of the RC structure. A specific manipulation of the delay line to overcome the performance degradation of the RC due to the frequency variations of the signal to be tracked is illustrated in [22]. In the presented cases, the RC is executed with a variable period to keep the delay-line at a constant depth, hence, the introduced variable delays must be accurately considered.…”

Section: Introductionmentioning

confidence: 99%

Analytical Delay Evaluation for FPGA-Based Repetitive Controller in AC Variable Frequency Applications

Faro,

Lidozzi,

di Benedetto

et al. 2024

IEEE Open J. Ind. Applicat.

View full text Add to dashboard Cite

Repetitive Controller provides a very low THD in the quantities under control. It exhibits an inherent issue when operated to track variable frequency references. The paper deals with the analysis of the operating conditions when the controller is executed at variable frequency without any resynchronization with respect to the PWM carrier, which is the most common mode of operation. The delays introduced are then evaluated analytically concerning the sampling and output frequency that must be tracked. The proposed analysis allows obtaining the maximum delay affecting the control chain, which introduced by the Repetitive Control desynched operation. The knowledge of the delay introduced in the control loops is at the basis of any control tuning procedure and gains selection, even when adaptive control

show abstract

“…The family of fixed sample rate RC strategies includes several different approaches. In [4], the control variables are updated depending on the phase of the grid voltage to reflect the grid frequency deviations in the average period delay unit. In [5] the Virtual Variable Sampling (VVS) method, which creates an adjustable virtual delay unit to closely approximate a variable sampling delay, is proposed to allow the discrete Fourier transform based selective harmonic RC to be frequency adaptive.…”

Section: Introductionmentioning

confidence: 99%

Constant Delay-Line Repetitive Control Analysis for Variable Frequency Operation

Faro

Benedetto

Lidozzi

et al. 2022

IEEE Open J. Power Electron.

View full text Add to dashboard Cite

The proposed paper deals with the complete analysis which is the basis of the common tuning procedure of variable sampling Repetitive Controllers for adjustable output frequency applications. The described approach can be applied without limitations to grid-tied inverters (narrow frequency variations), as well as to AC waveform generators (wide frequency variations). The operation of the proposed approach is to keep the Repetitive Control main delay line at a constant size, resulting in a very suitable implementation on FPGA-based control platforms. The effects of the desynchronization between the PWM modulator and the Control Loop will be accurately described, and the inherent delays will be expressed in closed form. Additional effects, like beating frequencies, are illustrated as well and described by closed-form expressions. Experimental verification is carried out to prove the effectiveness of the presented analysis.

show abstract

Average Periodic Delay-Based Frequency Adaptable Repetitive Control With a Fixed Sampling Rate and Memory of Single-Phase PFC Converters

Cited by 19 publications

References 44 publications

Complete decoupling compensation of three‐phase inverter with LCL filter in synchronous reference frame

Complete decoupling compensation of three‐phase inverter with LCL filter in synchronous reference frame

Analytical Delay Evaluation for FPGA-Based Repetitive Controller in AC Variable Frequency Applications

Constant Delay-Line Repetitive Control Analysis for Variable Frequency Operation

Contact Info

Product

Resources

About