Frequency-domain modelling of interharmonics in HVDC systems

Hume, D.J.; Wood, Alan; Osauskas, C.M.

doi:10.1049/ip-gtd:20030067

Cited by 17 publications

(14 citation statements)

References 11 publications

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“…They have provided several practical recommendations for interharmonics. Hume et al [32] has presented a fast and accurate method for the direct calculation of non-characteristic frequencies occurring around HVDC links. The technique calculates small signal linearized frequency cross coupling interrelationships for both converters about a base operating point, modelling the coupling with matrix transfers.…”

Section: Termmentioning

confidence: 99%

“…The voltage-current correlation, wave shape check or inter-harmonic-harmonic co-existence, may help to recognize if the non-integral components are real inter-harmonics; Zero-padding is helpful for spectrum readability improvement. It can be used to locate the inter-harmonic frequency; If inter-harmonics do exist, the voltage and current spectra should show correlation; Inter-harmonics usually co-exist with harmonics; Use of long window size if applicable will be advantageous to locate the inter-harmonics; If magnitude of a signal appears modulated, it is very likely that the signal contains interharmonics; The 5 Hz resolution and group harmonic/inter-harmonic concept as recommended by the IEC [31] and IEEE [32] might not be sufficient for inter-harmonic detection especially for those interharmonics that cause flickers.…”

Section: Termmentioning

confidence: 99%

“…This is mainly due to the variability of the frequency and the amplitude of inter-harmonics and consequently of the waveform periodicity, and to a great sensitivity to the spectral leakage phenomenon. The detailed study about the inter-harmonics is given in [21][22][23][24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

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Power system harmonics research: a survey

Singh

2007

Int Trans Elec Energy Syst

155

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SUMMARYThe increased use of power electronic controlled equipment, such as variable speed drives, automated production lines, personal computers and non-linear electronic devices in power systems has given rise to a type of voltage and current waveform distortion called as 'harmonics'. Harmonic can be defined as the undesirable components of a distorted periodic waveform whose frequencies are the integer multiples (non-integer multiples in case of inter-harmonics, and the frequency less than fundamental frequency in case of sub-harmonics) of the fundamental frequency. Presence of these harmonics results in increased losses, equipment heating and loss-of-life, and interference with protection, control and communication circuits as well as customer loads. The research has been underway since very beginning for control of power system harmonics and to supply consumers with reliable and 'clean' fundamental-frequency sinusoidal electric power that does not represent a damaging threat to their equipment. This paper, therefore, reviews the progress made in power system harmonics research and development since its inception. Attempts are also made to highlight the current and future issues involved in the development of quality and reliable electric power technology for future applications. A list of 145 research publications on the subject is also appended for a quick reference.

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Section: Termmentioning

confidence: 99%

Section: Termmentioning

confidence: 99%

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Power system harmonics research: a survey

Singh

2007

Int Trans Elec Energy Syst

155

View full text Add to dashboard Cite

show abstract

“…[10,11] and the numerical differentiation method proposed in Ref. [12], closed-form equations are derived for the Jacobian term associated to each linear constraint equation:…”

Section: Linearised Constraint Equationsmentioning

confidence: 99%

“…Hence, a true linearisation of the equations associated to switching instants is not calculated in the approach. The inclusion of the AC and DC systems with the linearised HVDC converter is carried out by linearising each individual component and then combining all individual transfers together using nodal analysis [11].…”

Section: Introductionmentioning

confidence: 99%