Active Harmonic Mitigation: What the Manufacturers Don't Tell You

Hoevenaars, A. H.; Farbis, Marek; McGraw, M.G.

doi:10.1109/mias.2020.2982484

Cited by 19 publications

(7 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the considered system, these oscillations occurred in the band over 2 kHz. This argument supports the legitimacy of conducting the analysis not only in the range of harmonics provided for in the PN-EN 50160 standard [35], but in justified cases in the widest possible band, at least up to the switching frequency of the converter transistors in the power circuit of the compensator [34] (which was done in this study). Therefore, one must be careful not to introduce additional parasitic harmonics when using a filter.…”

Section: Obtained Static Characteristics As a Function Of Equivalent ...supporting

confidence: 83%

Selected static characteristics of a parallel active power filter with feedback from the supply voltage

Grugel,

Mućko

2024

Archives of Electrical Engineering

View full text Add to dashboard Cite

The article presents selected static characteristics of a parallel active filter with voltage control in the supply line (VPAPF – Voltage-controlled Active Power Filter) as a function of parameters of the supply network. The tests were done on the basis of a simulation model of the supply network and an appropriate compensator. The test results showed that VPAPFs are most suitable for operation in weak networks, maintaining an almost constant level of voltage distortion, regardless of the value of the network impedance. In addition, the influence of the parameter G corresponding to the conductance value suppressing higher harmonics of the network voltage on the operation of the active power filter was determined.

show abstract

Section: Obtained Static Characteristics As a Function Of Equivalent ...supporting

confidence: 83%

Selected static characteristics of a parallel active power filter with feedback from the supply voltage

Grugel,

Mućko

2024

Archives of Electrical Engineering

View full text Add to dashboard Cite

show abstract

“…Once the new regulations are published, the solution can only be applied to equipment still in the design phase, such as the implementation of electromagnetic interference (EMI) filters and power electronics systems that, by controlling their mode of operation, can modify the spectral characteristics of high-frequency emissions [51]. The simplest method of SH mitigation is to use active filters which are necessary to compensate for wave distortion connected to the POC at the consumer side, as shown in Figure 13 [52]. These active filters comprise inductors and capacitors and could be either T shaped (LCL type) or π shaped (CLC type), depending on the filter equivalent circuit per phase [53].…”

Section: B Mitigation By Active Filtersmentioning

confidence: 99%

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

et al. 2021

View full text Add to dashboard Cite

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.

show abstract

“…• bidirectional electric power flow control with configurable cos(ϕ) values; • compliance with international electromagnetic compatibility standards [13]; • high efficiency rating at 95% to 98% [14].…”

Section: Three-level Active Front-endmentioning

confidence: 99%

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

et al. 2021

View full text Add to dashboard Cite

The existing publications on the analysis of power quality indicators in modern electric power supply systems are void of a comprehensive approach to improving these indicators in power systems by implementing multipulse connections. To the authors’ knowledge, this paper is the first to analyze current harmonic distortions in an 18-pulse connection of three-level active front-ends (AFE) featuring a programmed PWM. Raw data were obtained from, and current quality was analyzed for the power circuit of the main electric drive actuating the rolls in the rolling stand of a plate mill. The key feature of such circuitry is that the synchronous motor of each work roll is connected to the grid with an 18-pulse connection that uses three phase-shift transformers, where the phase shifts are 0° (delta/delta), 20° (delta/polygon) and −20° (delta/polygon). The circuitry connects three frequency converters (FC) with the AFEs in parallel. Phase-shift transformers were found to periodically overheat in the process. When overheating occurred, a programmed PWM voltage waveform was applied where harmonics 17 and 19 were eliminated. The goal and objectives were to analyze why the transformer would overheat and to find out how the issue could be addressed. The authors developed a simulation model of the research object in order to assess power quality parameters. Simulation results obtained in Matlab/Simulink were used to estimate the total harmonic distortions (THD) and individual harmonic factors for up to the 50th secondary transformer winding and grid harmonic with four different programmed AFE PWM voltage waveforms. The results helped find the best such waveform to prevent phase-shift transformers from overheating; one with harmonics 5, 7, 17 and 19 eliminated. The experimental and mathematical modeling results in the paper were confirmed by positive effects after industrial implementation of the system. Research performed directly on the operating equipment has been classified by the company and is not publicly available. These results are highly versatile and could be used in similar research on other circuitries to ensure the electromagnetic compatibility of nonlinear power-consuming devices.

show abstract

Active Harmonic Mitigation: What the Manufacturers Don't Tell You

Cited by 19 publications

References 31 publications

Selected static characteristics of a parallel active power filter with feedback from the supply voltage

Selected static characteristics of a parallel active power filter with feedback from the supply voltage

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

Finding the Best Programmable PWM Pattern for Three-Level Active Front-Ends at 18-Pulse Connection

Contact Info

Product

Resources

About