Fully Integrated TL-C-L Filter for Grid-Connected Converters to Reduce Current Harmonics

Al-Barashi, Majid M.; Liu, Zhigang; Saeed, Mahmoud S. R.; Wu, Siqi

doi:10.1109/ecce-asia49820.2021.9479097

Cited by 7 publications

(33 citation statements)

References 16 publications

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“…Table 1 lists the designed parameters for the LCL, LLCL, and magnetic integrated LLCL filters, while Figure 6 shows a comprehensive design flowchart of the magnetic integrated LLCL filter. Furthermore, ac/dc grid-tied inverters with magnetic integrated LLCL filters can have an identical controller structure like that implemented in [17,21,28,32], thus would not be explored herein.…”

Section: Analysis On Power Losses In Inductors and Calculation Of Win...mentioning

confidence: 99%

“…The magnetic integration technique has been adopted to solve the second issue, that is, minimizing the size and expenses of the LCL filter and its modified configurations too [24][25][26][27][28][29][30][31][32]. This technique replaces several discrete inductors with an integrated one, utilizing one magnetic core wound with various windings.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Al-Barashi

Liu

et al. 2022

IET Power Electronics

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This paper presents a design technique of magnetic integrated LLCL filters for grid-tied inverters. With the proposed design technique, the LLCL filter's resonant frequency can be higher than the Nyquist frequency. Furthermore, the proposed concept was only reported for the LCL filter in the previous research works. In addition, the modulation process will produce dominant switching harmonics for unipolar PWM H-bridge inverters at the double switching frequency. Thus, putting the resonant frequency beyond the Nyquist frequency will increase the stability zone. The proposed design methods maximize the filter inductors' utilization and resist the grid impedance variations under weak grid conditions, depending on the improved stability zone. Comparative simulation and HIL experimental results are presented to confirm the effectiveness of the proposed magnetic integrated LLCL filter design. The HIL experimental results and the simulation results agree well with each other.

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Section: Analysis On Power Losses In Inductors and Calculation Of Win...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Al-Barashi

Liu

et al. 2022

IET Power Electronics

Self Cite

View full text Add to dashboard Cite

show abstract

“…The viability of the magnetic integration strategy using one multi-winding magnet core for attaining the task of many separate inductors was investigated in [25][26][27][28][29][30][31][32]. Moreover, this paper presents and reports the fully integrated T-LCL filter's advantages.…”

Section: Magnetic Circuit Analysismentioning

confidence: 99%

“…After applying these design procedures, the parameters of the fully integrated T-LCL, separated T-LCL, LCL, and L filters can be listed in Table 2. Moreover, a similar control system to that provided in [31,33,36,49,50] may be used for the traction converter with the proposed filter, so it will not be explored herein. The verification results will be given in Section 4 to prove the presented filter design validity.…”

Section: Modelling and Parameter Design Of Fully Integrated T-lcl Filtermentioning

confidence: 99%

“…A general drawback of trap filters is that the extra filter elements, especially the trap inductors with additional magnetic cores, cause increases in size and expenses. Adopting the magnet integration method, which uses one multiwinding magnetic core to substitute many separate inductors resulting in increased power density and network performance, is one approach to overcoming this drawback [25][26][27][28][29][30][31][32]. The utilization of the trap-filters mutual inductances was explored and will be further analysed briefly in the following sections.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing power quality of high‐speed railway traction converters by fully integrated T‐LCL filter

Al-Barashi

Meng

Liu

et al. 2022

IET Power Electronics

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Modulating the traction converters produces current harmonics at the switching frequencies and their multiples. These harmonics should be minimized to meet the network specifications. The LC‐trapped filters, tuned to these frequencies, can easily meet this requirement, but the existing applicable trap filters have not been studied with the traditional traction system topologies. Thus, this paper presents a trapped LCL filter with an LC resonator on the converter side, called a fully integrated T‐LCL filter, for the traction power supply system. The model and analysis reported in this research demonstrate that the presented filter has several advantages, which can be summarized by: reducing the size by winding many coils through magnetic integration, attenuating the switching frequency and its multiple harmonics that reduce the current total harmonic distortion, assuring durability against the filter parameters differences, and preserving system stability under transient conditions. The proposed filter can become a promising trap filter based on these advantages. Simulation models of an ac/dc single‐phase traction rectifier with the proposed filter were created and tested in MATLAB/Simulink, verifying its superiority. Finally, the filter is validated by performing hardware‐in‐the‐loop experiments.

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Structure evolving and comparative analysis of grid-connected converter output filter

Zhou

Huang

2023

Electr Eng

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Fully Integrated TL-C-L Filter for Grid-Connected Converters to Reduce Current Harmonics

Cited by 7 publications

References 16 publications

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Magnetic integrated LLCL filter with resonant frequency above Nyquist frequency

Enhancing power quality of high‐speed railway traction converters by fully integrated T‐LCL filter

Structure evolving and comparative analysis of grid-connected converter output filter

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