Suppression of the Peak Harmonics from Loads by Using a Variable Capacitance Filter in Low-Voltage DC/DC Converters

Huang, Jin; Shi, Hongda

doi:10.1109/temc.2016.2552230

Cited by 10 publications

(2 citation statements)

References 33 publications

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“…In [2] two strategies are proposed to reduce the emission of harmonics, one of which proposes to reduce emissions along the propagation path using filtering devices. New passive mitigation technologies have been proposed, such as a variable capacitance filter [3]. However, this strategy has the disadvantage that it requires more space on the Printed Circuit Board (PCB) and obviously increases the cost, so it is preferable to find another solution to reduce the emission of these interferences.…”

Section: Introductionmentioning

confidence: 99%

Fast FPGA Prototyping to Explore and Compare New SPWM Strategies

Geninatti,

Ortiz-López,

Quiles-Latorre

et al. 2024

IEEE Trans. Circuits Syst. I

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This study presents a Flexible Test Bench (FTB) implemented with FPGA that synthesises of a large number of strategies that apply "Spread Spectrum" to reduce the energy of the fundamental harmonics present in a conventional Pulse Width Modulation (PWM). The FTB not only incorporates most of the known spread spectrum techniques but also allows to combine them and even to easily create new ones, thus providing a highly flexible test bench. The FTB has been described in standard VHDL, so it can be synthesised using any synthesis tool, and the number of logical resources used by each of them can be determined according to the spread spectrum strategy configured in its registers. Therefore, a tool is available to choose, according to the spectral response and the consumption of logic resources, the most suitable PWM spread spectrum strategy for each application. The particularity of the proposal is to have a unique hardware platform that allows the comparison of different techniques under the same physical implementation conditions since geometry and physical location are important when evaluating the conducted and radiated emission of the circuits. Another objective of our FTB is to solve in a unified way all the numerical aspects present in the FPGA-based implementation so that the numerical ranges and roundings used affect all the implemented techniques equally.

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Section: Introductionmentioning

confidence: 99%

Fast FPGA Prototyping to Explore and Compare New SPWM Strategies

Geninatti,

Ortiz-López,

Quiles-Latorre

et al. 2024

IEEE Trans. Circuits Syst. I

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“…For example, the authors in [10] proposed random-pulse position modulation (RPPM) method to mitigate SH emissions in neutral point clamped (NPC) inverters. Multiple filtering devices (e.g., variable capacitance filter) would be used to mitigate SH emissions [11].…”

Section: Introductionmentioning

confidence: 99%

Supraharmonics in Power Grid: Identification, Standards, and Measurement Techniques

et al. 2021

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In the electric power distribution system, power electronics technologies associated with renewable energy systems (RES) and smart grids have gained growing interest. The power electronics devices are used to convert, control, or transfer electric power from RES to the power grids. However, the continuous increase in switching frequencies resulting from these power electronics technologies has led to the emergence of new emissions in the range of 2-150 kHz, outside the classical frequency range for power quality. These emissions are known worldwide as supraharmonics (SH).These emissions negatively affect the power quality of electrical distribution systems and reduce their efficiency and lifetime. Thus, the supraharmonics emissions have been investigated in the literature, and several methods were developed focusing on identifying, measuring, and setting new standards to mitigate the impact of these emissions on the power quality. Although these individual studies have been well documented, a comparative overview of its identifications, current standards, and measurement techniques had not been described so far. Therefore, this study extensively reviews the related techniques and standards for identifying, measuring, and mitigating SH emissions. Moreover, the current research gap in this important field is highlighted, and an illustration on how this problem was tackled in the past few years is presented. Additionally, the SH characteristics alongside with insights into the mitigations and measurements are highlighted and analyzed accordingly. Finally, some important recommendations to mitigate SH emissions are suggested. This review will hopefully strengthen the efforts toward the development of SH domain by providing the necessary groundwork for further mitigations, standards, and measuring techniques improvement. INDEX TERMS Grid integration; harmonics emissions; high frequency; power quality; renewable energy sources; supraharmonics.

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