Analysis and Suppression of the Frequency-Aliasing Phenomenon Related to the Sorting-Algorithm-Based Voltage-Balance Strategy in an MMC System

Wang, Chuyang; Zhang, Li; Xie, Wenjun; Xiao, Lan; Zhang, Zitao; Zhang, Ziwei; Chen, Dianhao

doi:10.1109/tpel.2021.3098629

Cited by 5 publications

(2 citation statements)

References 31 publications

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“…Figure 2 shows the conventional VBC [27][28][29]. The reference signal is generated based on the closed-loop control [30]. Under the modulation process, the N i SMs should be inserted according to the reference signal.…”

Section: Conventional Vbcmentioning

confidence: 99%

A Capacitance Monitoring Strategy Based on Offset Error Compensation for Modular Multilevel Converters

Jiang,

Deng,

et al. 2024

Energies

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The modular multilevel converter (MMC) is a research hotspot in medium-voltage and high-voltage applications. The measurement offset error would cause an increase in the monitoring error of the submodule (SM) capacitance of the MMC, affecting the estimation accuracy of the SM capacitance monitoring. This paper proposes a capacitor monitoring strategy based on the offset error compensation, where two reasonable capacitor monitoring periods are selected in one fundamental period under the proposed voltage-balancing control (VBC) based on the virtual capacitor voltage (VCV) to compensate for the offset error impact on the capacitance monitoring. The proposed strategy can effectively eliminate the offset error impact on the capacitance monitoring, which ensures the accuracy of the SM capacitance monitoring in the MMCs. The effectiveness of the proposed monitoring strategy is confirmed by the simulations and experiments.

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Section: Conventional Vbcmentioning

confidence: 99%

A Capacitance Monitoring Strategy Based on Offset Error Compensation for Modular Multilevel Converters

Jiang,

Deng,

et al. 2024

Energies

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“…However, the high-frequency operation of the switching device interferes with the sampling of the signal, causing the sampled signal to carry high-frequency harmonic components. High-frequency switching harmonics are introduced into the control loop, resulting in lowfrequency aliasing in regular-sampling pulse-width modulation (PWM) [14]. Due to sample aliasing, the grid-connected current of the photovoltaic (PV) inverter may be severely distorted [15].…”

Section: Introductionmentioning

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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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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Small-signal stability of AC/DC capacity and MMC controller voltage loop dominated systems

Bai

2023

J. Power Electron.

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Analysis and Suppression of the Frequency-Aliasing Phenomenon Related to the Sorting-Algorithm-Based Voltage-Balance Strategy in an MMC System

Cited by 5 publications

References 31 publications

A Capacitance Monitoring Strategy Based on Offset Error Compensation for Modular Multilevel Converters

A Capacitance Monitoring Strategy Based on Offset Error Compensation for Modular Multilevel Converters

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

Small-signal stability of AC/DC capacity and MMC controller voltage loop dominated systems

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