Supraharmonics reduction in LED drivers via random pulse-position modulation

Garrido-Zafra, Joaquín; Moreno-Munoz, A.; Gil-de-Castro, Aurora; Ortiz-López, Manuel; Morales, Tomás

doi:10.1080/00207217.2018.1494336

Cited by 5 publications

(4 citation statements)

References 13 publications

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“…The most significant HFD sources were revealed to be photovoltaic (PV) power parks and electric vehicles (EVs) [16] and their charging stations (EVCSs), which are more intimately interconnected in the MV and LV grids, rather than larger wind parks and other large power installations, usually connected farther away in the grid an closer to the highvoltage level, with some exceptions [17,33,34].…”

Section: Typical Amplitude and Frequency Of Hfdsmentioning

confidence: 99%

“…In the literature, several papers are focused on the topic of HFD. These research studies are focused on measuring the level of emissions generated by different sources [9,10] and their effects on LV and MV power system components [11], evaluation methods of HFD levels [12,13], propagation through power network impedance [14,15], and mitigation strategies [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

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Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

Agazar,

D’Avanzo,

Frigo

et al. 2024

Sensors

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The phenomenon of high-frequency distortion (HFD) in the electric grids, at both low-voltage (LV) and medium-voltage (MV) levels, is gaining increasing interest within the scientific and technical community due to its growing occurrence and the associated impact. These disturbances are mainly injected into the grid by new installed devices, essential for achieving decentralized generation based on renewable sources. In fact, these generation systems are connected to the grid through power converters, whose switching frequencies are significantly increasing, leading to a corresponding rise in the frequency of the injected disturbances. HFD represents a quite recent issue, but numerous scientific papers have been published in recent years on this topic. Furthermore, various international standards have also covered it, to provide guidance on instrumentation and related algorithms and indices for the measurement of these phenomena. When measuring HFD in MV grids, it is necessary to use instrument transformers (ITs) to scale voltages and currents to levels fitting with the input stages of power quality (PQ) instruments. In this respect, the recently released Edition 2 of the IEC 61869-1 standard extends the concept of the IT accuracy class up to 500 kHz; however, the IEC 61869 standard family provides guidelines on how to test ITs only at power frequency. This paper provides an extensive review of literature, standards, and the main outputs of European research projects focusing on HFD and ITs. This preliminary study of the state-of-the-art represents an essential starting point for defining significant waveforms to test ITs and, more generally, to achieve a comprehensive understanding of HFD. In this framework, this paper provides a summary of the most common ranges of amplitude and frequency variations of actual HFD found in real grids, the currently adopted measurement methods, and the normative open challenges to be addressed.

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Section: Typical Amplitude and Frequency Of Hfdsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

Agazar,

D’Avanzo,

Frigo

et al. 2024

Sensors

View full text Add to dashboard Cite

show abstract

“…There are mainly several ways to reduce CM noise under the condition of removing the Y-capacitor. The first method is to suppress the noise source or to reduce the spectrum amplitude of the noise source, including frequency-jitter control algorithm [5][6][7], a Correspondence to: Qi Liu. E-mail: lq_seu@126.com *National ASIC System Engineering Research Centre, Southeast University, Sipailou#2, Nanjing, 210096, China **Lianyungang JARI Electronics Co. Ltd, Shenghulu#18, Lianyungang, 222007, China soft switching [8,9], clamping technology, etc.…”

Section: Introductionmentioning

confidence: 99%

“…There are mainly several ways to reduce CM noise under the condition of removing the Y‐capacitor. The first method is to suppress the noise source or to reduce the spectrum amplitude of the noise source, including frequency‐jitter control algorithm [5–7], soft switching [8,9], clamping technology, etc. This is the most direct method, but it cannot be implemented in all topologies.…”

Section: Introductionmentioning

confidence: 99%

An EMI‐Optimized Transformer for De‐Y Flyback Converter with Low Common‐Mode Noise

Wang

Shao

Liu

et al. 2021

IEEJ Transactions Elec Engng

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member Y-capacitors are widely used in flyback converters to suppress common-mode (CM) noise to comply with the strict electromagnetic interference (EMI) standards. However, Y-capacitors increase the leakage current between the primary and secondary side, which is not allowed in the applications with high safety requirements. In this paper, the displacement current models of two conventional De-Y methods are quantitatively established to analyze their limitations for the flyback converter. Then, a hybrid EMI-optimized transformer is proposed to improve the limitations. The proposed structure can completely balance the CM noise between the primary and secondary sides, making the flyback converter comply with the EMI standard under the conditions of no Y-capacitor. Compared with the traditional methods, the proposed method has a better capability for CM noise suppression, higher universality and the same cost. Finally, the simulation and experimental results verify that the CM noise of the new transformer structure decreases about 10 dB compared with that of the conventional one.

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Characterization of the impact of PV and EV induced voltage variations on LED lamps in a low voltage installation

Ravindran

Sakar

Rönnberg

et al. 2020

Electric Power Systems Research

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Supraharmonics reduction in LED drivers via random pulse-position modulation

Cited by 5 publications

References 13 publications

Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

Power Grids and Instrument Transformers up to 150 kHz: A Review of Literature and Standards

An EMI‐Optimized Transformer for De‐Y Flyback Converter with Low Common‐Mode Noise

Characterization of the impact of PV and EV induced voltage variations on LED lamps in a low voltage installation

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