Aliasing Effect in Real-Time Sampling for Grid-Connected LCL-LC-Filtered Inverter with Capacitor Current Feedback

Shi, Yiwen; Xu, Jinming; Xie, Shaojun

doi:10.1109/ecce-asia49820.2021.9479317

Cited by 2 publications

(2 citation statements)

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“…Third, suppressing low-order harmonics through anti-aliasing filters is also a common approach. In [23], it is verified by simulation that the LCL-LC filter produces much lighter sampling aliasing than the LCL filter. However, this method can affect the sampling accuracy and require additional filtering components.…”

Section: Introductionmentioning

confidence: 82%

“…However, the method proposed in [25] has the highest computational complexity compared with other harmonic and aliasing suppression methods and cannot filter out all switching harmonics (SHs). On the other hand, the improved repetitive filter in [23] reduces the advantage of multiple sampling and only removes integer switching harmonics, resulting in the presence of low-frequency harmonics in the control loop. However, the proposed method in this paper can filter out all switching harmonics.…”

Section: Comparison Of Different Harmonic and Aliasing Suppression Me...mentioning

confidence: 99%

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Aliasing Suppression Method for a Three-Phase Grid-Connected Photovoltaic Inverter Based on Multi-Sampling and Mean Filtering

Geng,

Xu,

2024

Energies

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In order to reduce the sampling delay and improve bandwidth, sability margin, and the robustness of the active damping in LCL-filtered grid-connected inverters, real-time sampling provides a convenient method. However, aliasing is easily introduced in the control loop because of high-frequency switching harmonics, resulting in a rise in low-order harmonics. To address the challenge of aliasing under real-time sampling, a new method based on multisampling and mean filtering is proposed by combining the proposed harmonic detection and control methods in this paper. This method works by sampling and controlling the fundamental current and selective subharmonic currents separately. The fundamental current control loop without any additional filters maintains real-time sampling, while multisampling and mean filters are applied to the harmonic current control loop. The proposed control method can not only improve the dynamic response performance and control stability of the system but also effectively suppress the selective low-order current harmonics and the aliasing of sampling. Finally, the correctness of the proposed sampling scheme and control strategy is verified by the simulation based on R2018b, MathWorks, Natick, MA, USA and an experimental prototype of a three-phase grid-connected photovoltaic inverter rated at 230 V/50 Hz/40 kW.

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Section: Introductionmentioning

confidence: 82%

Section: Comparison Of Different Harmonic and Aliasing Suppression Me...mentioning

confidence: 99%

Aliasing Suppression Method for a Three-Phase Grid-Connected Photovoltaic Inverter Based on Multi-Sampling and Mean Filtering

Geng,

Xu,

2024

Energies

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show abstract

An Improved Control Strategy to Reduce Torque Spikes and Ripple for Bearingless Switched Reluctance Motors

Yu,

Cao,

Deng

et al. 2024

IEEE Trans. Ind. Inf.

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Aliasing Effect in Real-Time Sampling for Grid-Connected LCL-LC-Filtered Inverter with Capacitor Current Feedback

Cited by 2 publications

References 10 publications

Aliasing Suppression Method for a Three-Phase Grid-Connected Photovoltaic Inverter Based on Multi-Sampling and Mean Filtering

Aliasing Suppression Method for a Three-Phase Grid-Connected Photovoltaic Inverter Based on Multi-Sampling and Mean Filtering

An Improved Control Strategy to Reduce Torque Spikes and Ripple for Bearingless Switched Reluctance Motors

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