Influences of the anti-aliasing filter damping factor in an active power filtering environment

Kanieski, João Marcos; Scapini, Rafael Z.; Gründling, Hilton Abílio; Cardoso, Rafael

doi:10.1109/induscon.2010.5740027

Cited by 5 publications

(5 citation statements)

References 4 publications

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“…In the converter control system, commonly used antialiasing strategies can be classified into three types: sampling moment arrangement [16][17], oversamplingbased digital filtering [14], analog filtering [18].…”

Section: A Limitations Of Commonly Used Anti-aliasing Strategiesmentioning

confidence: 99%

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High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

Duan

Sheng

et al. 2023

IEEE Access

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The digital controller of the grid-connected converter achieves closed-loop control by sampling key voltage and current signals. High-frequency commutation of power electronic switches introduces high-frequency ripples into the signals, which may cause sampling aliasing. Severe distortion may happen in the output current of the converter because of the sampling aliasing. This paper explains how the aliasing problem arises by analyzing the spectrum of signals for sampling control. The explanation shows the severity of the aliasing problem and the necessity of adopting anti-aliasing methods. Next, this paper analyzes the impact of commonly used anti-aliasing low-pass filters on current control stability. From the conclusions, adopting a low-pass anti-aliasing filter reduces the stability margin of the current loop, which needs improvement. So this paper proposes a novel hybrid anti-aliasing filter based on the combination of the notch and low pass analog filters. An experiment on a 6kVA prototype verifies the proposed anti-aliasing method. This paper shows distortion and step-response oscillation of the output current when proposed and traditional anti-aliasing methods adopted. The comparison shows the advantages of the proposed anti-aliasing method.KEYWORDS grid-connected converter, high-frequency ripples, anti-aliasing strategy, stability margin.

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Section: A Limitations Of Commonly Used Anti-aliasing Strategiesmentioning

confidence: 99%

“…Therefore, some sample anti-aliasing strategies [14]- [18] should be adopted to suppress the aliasing problem. Some of these anti-aliasing strategies, such as analog low pass filters [18], may introduce phase lag to the sampled signals.…”

Section: Introductionmentioning

confidence: 99%

High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

Duan

Sheng

et al. 2023

IEEE Access

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“…Some other scholars have investigated aliasing from a sampling perspective. The analysis method based on frequency domain transformation in the literature [18] shows that high-frequency signals transition into low-frequency signals through sampling aliasing. It is proposed to use an analog anti-aliasing filter to remove high-frequency signals before sampling.…”

Section: Introductionmentioning

confidence: 99%

Ripple Attenuation and Aliasing Suppression in Multisampling Digitally Controlled Inverters

Yu,

Niu,

Shi

et al. 2024

IEEE Access

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The application of multisampling technology in voltage-source inverters (VSIs) systems can significantly reduce the control delay and break the bandwidth limitations of traditional synchronous sampling schemes. However, when sampling the capacitor voltage, the high-frequency ripple is introduced into the control loop, leading to the local vertical crossing (VC) phenomenon. Previous studies have demonstrated that a moving average filter (MAF) or improved repetitive filter (IRF) can effectively remove the high-frequency ripple. However, they introduce additional phase lag, which undermines the advantages of multisampling technology in terms of phase boost. The approach of spectrum analysis can be used to study the impact of voltage ripple. The results indicate that after modulation, the output signal contains low-frequency harmonics, and the superposition of the ripple makes the modulation process more susceptible to saturation. Therefore, a 20k ripple notch filter (RNF) is proposed to attenuate the ripple signal while introducing a more minor phase lag. Additionally, a 90° phase shift filter is proposed to suppress the aliasing signals generated in the system. Finally, the effectiveness of the proposed methods is verified through the experimental test of a 10kW single-phase VSI system.INDEX TERMS aliasing, control delay, voltage source inverters (VSIs), multisampling, low-order harmonics

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“…In an early stage, some simulation based analysis is presented to illustrate the aliasing phenomenon when sampling at valley/peak of carrier wave within one switching period [21][22]. In [23], based on the natural sampling SPWM, a multi-frequency PWM model is established to analyze the amplitude and phase of aliased low-order harmonics.…”

Section: Introductionmentioning

confidence: 99%

“…However, the multisampled SHs still exist if adding a high-pass filter, because the turnover frequency of high-pass filter should be lower than the resonant frequency. The anti-aliasing low-pass filter or moving-average filter are used in [21][22][35][36][37], but the introduced delay is large and it will reduce the advantage of multisampling control. Simplified repetitive filter (SRF), among others, provides a competitive approach to filter out SHs, which utilizes the periodic nature of harmonic distortions, and does not affect the phase boost of multisampling control [20].…”

Section: Introductionmentioning

confidence: 99%

Aliasing Suppression of Multisampled Current-Controlled LCL-Filtered Inverters

Zhou

Wang

et al. 2022

IEEE J. Emerg. Sel. Topics Power Electron.

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Multisampling control provides an attractive way to reduce the control delays in LCL-filtered grid-connected inverters. Thereby, the bandwidth and stability margin will be improved. However, high frequency switching harmonics (SHs) is introduced in the control loop when the inverter-side current is sampled. In order to investigate the effect of multisampled high frequency SHs, the relationship between the double-update pulse width modulation (PWM) and multiupdate PWM is deduced through geometric deduction. It is shown that the multi-update PWM is equivalent to doubleupdate PWM with sampling instant shift, and the equivalent Nyquist frequency is equal to the switching frequency. Moreover, the non-averaged value of current is sampled within one switching period and aliased low-order harmonics will appear in the grid-side current. Hence, filtering the multisampled SHs is necessary, and an improved repetitive filter is proposed to remove all the sampled SHs and keep the advantage of phase boost by using the multisampling control. The method is evaluated with a single-loop inverter-side current control, and its effectiveness is verified through the simulation and experiment.

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Influences of the anti-aliasing filter damping factor in an active power filtering environment

Cited by 5 publications

References 4 publications

High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

High-Frequency Current Ripple Sample Anti-Aliasing Strategy of Digitally Controlled Converter Based on Notch Filter

Ripple Attenuation and Aliasing Suppression in Multisampling Digitally Controlled Inverters

Aliasing Suppression of Multisampled Current-Controlled LCL-Filtered Inverters

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