The Modified Harmonic Domain: Interharmonics

Ramirez, Abner

doi:10.1109/tpwrd.2010.2061239

Cited by 49 publications

(20 citation statements)

References 7 publications

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“…In [14], the DFT is expressed in a matrix-vector formulation leading to a variant of traditional approach for computational savings. Such technique is also referred to as the modified harmonic domain [18]. From the practical perspective, some issues can be caused by improper application of DFT (e.g., asynchronous sampling) [26], including an aliasing effect, spectral leakage, and picket-fence effect.…”

Section: Introductionmentioning

confidence: 99%

Online Detection of Fundamental and Interharmonics in AC Mains for Parallel Operation of Multiple Grid-Connected Power Converters

Chen

et al. 2018

IEEE Trans. Power Electron.

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Abstract-Parallel operation of multiple grid-connected power converters through LCL filters is known to have the potential problem of triggering oscillations in the ac mains. Such oscillatory frequencies are not integral multiples of the fundamental frequency and hence form a new source of interharmonics. Early detection of such oscillations is essential for the parallel power converters to move out of the unstable zone. This paper presents an online observer-based algorithm that can perform fast detection of interharmonics within a specified frequency band. The algorithm has been adopted in a specific and reduced form from an integral observer algorithm for detection of fundamental and interharmonic voltage components in the ac mains. A new method based on the kernel signal for fast interharmonic detection is proposed and practically verified. It has been implemented in a digital controller to detect oscillations such as those occurring between two grid-connected power converters. The practical results indicate that the algorithm can locate such frequency within the specific frequency band within 1 mains cycle.

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Section: Introductionmentioning

confidence: 99%

Online Detection of Fundamental and Interharmonics in AC Mains for Parallel Operation of Multiple Grid-Connected Power Converters

Chen

et al. 2018

IEEE Trans. Power Electron.

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“…(iv) Iterative harmonic analysis is unable to model non-linear load. For the above reasons, the research work in interharmonics measurement is still on the way [25][26][27][28][29][30][31][32][33][34][35][36][37][38].…”

Section: Introductionmentioning

confidence: 99%

Development of leakage energy allocation approach for time‐varying interharmonics tracking

Lin¹

2015

IET Generation, Transmission & Distribution

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Recently, an increasing use of power electronic facilities in industry has produced considerable harmonics and interharmonics in power systems. The power supply quality is therefore seriously threatened. The discrete Fourier transform (DFT) is currently the most important tool in signal analysis. However, a misapplication of DFT may result in incorrect outcome because of some inherent limitations such as spectral leakage or aliasing effect etc. The existing interharmonics even raise more difficulty in signal analysis than harmonics. To overcome this dilemma, this study develops a strategy of leakage energy allocation method for both stationary and non-stationary interharmonics identification. The proposed algorithm can regain its original interharmonics amplitude by restoring all spilled leakage energy, and also finds its individual frequency component according to the distribution of spilled leakage energy. The performance effectiveness of the proposed approach is verified using the numerical examples in terms of reliability, rapid response and high-precision performance.

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“…Consequently, methods for computing the steady state of a network have evolved from considering fundamental power frequency [12][13][14][15][16], to processing a large number of frequencies [17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

“…In this tenor, we propose a GPU implementation of the multi-frequency hybrid BFS technique (hereafter referred to as BFS only) which is mainly applicable to radial and/or weakly meshed networks [12]. The BFS method is able to: (i) include harmonics and interharmonics [17,18], since it is formulated in a modified harmonic domain (MHD) [22], (ii) avoid computation and inversion of Jacobian matrices and (iii) handle nonlinear components in a hybrid time/frequency domain solution scheme [17,18].…”

Section: Introductionmentioning

confidence: 99%

Multi-frequency sweeping method for periodic steady-state computations on the graphics processor unit

Morales-Aguilar

Ramirez

Matar

2015

Electric Power Systems Research

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The Modified Harmonic Domain: Interharmonics

Cited by 49 publications

References 7 publications

Online Detection of Fundamental and Interharmonics in AC Mains for Parallel Operation of Multiple Grid-Connected Power Converters

Online Detection of Fundamental and Interharmonics in AC Mains for Parallel Operation of Multiple Grid-Connected Power Converters

Development of leakage energy allocation approach for time‐varying interharmonics tracking

Multi-frequency sweeping method for periodic steady-state computations on the graphics processor unit

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