On the Processing of Harmonics and Interharmonics: Using Hanning Window in Standard Framework

Testa, A.; Gallo, Daniele; Langella, R.

doi:10.1109/tpwrd.2003.820437

Cited by 199 publications

(77 citation statements)

References 3 publications

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“…The fluctuating wind speed at one single spatial point is simulated by the MS, WAWS, and AR methods, respectively, in the same initial condition listed as follows: the average wind velocity 0 = 31.654 m/s, the number of the sampling points = 1200, time step Δ = 0.1 s, and the measuring point (in meters) is located at (0, 0, 5). The error between the energy [34] of the simulated and theoretical results solved by (17) can assess the accuracy of the simulation method by fast Fourier transform (FFT) [35] and frequency-time conversion methods [36,37]: where ( ) is time series of wind velocity, ( ) the amplitude spectrum obtained from ( ) by FFT, and the lasting time of time series of wind speed. The energy Ω is calculated by the square of the amplitude spectral mode divided by the lasting time .…”

Section: Validation For the Ms Methodmentioning

confidence: 99%

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Zhou

Han

et al. 2017

Shock and Vibration

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The offshore structures that play a vital role in oil and gas extraction are always under complicated environmental conditions such as the random wind loads. The structural dynamic response under the harsh wind is still an important issue for the safety and reliable design of offshore structures. This study conducts an investigation to analyze the wind-induced structural response of a typical offshore deck structure. An accurate and efficient mixture simulation method is developed to simulate the fluctuating wind speed, which is then introduced as the boundary condition into numerical wind tunnel tests. Large eddy simulation (LES) is utilized to obtain the time series of wind pressures on the structural surfaces and to determine the worst working condition. Finally, the wind-induced structural responses are calculated by ANSYS Parametric Design Language (APDL). The numerically predicted wind pressures are found to be consistent with the existing experimental data, demonstrating the feasibility of the proposed methods. The wind-induced displacements have the certain periodicity and change steadily. The stresses at the top of the derrick and connections between deck and derrick are relatively larger. These methods as well as the numerical examples are expected to provide references for the wind-resistant design of the offshore structures.

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Section: Validation For the Ms Methodmentioning

confidence: 99%

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Zhou

Han

et al. 2017

Shock and Vibration

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“…This condition results in error when some algorithms, such as the DFT, are utilized. For this reason, the signal used by the algorithm should contain one or more complete cycles [3]. Some methods are proposed as a form of enhancing the leakage effect due to the asynchronous sampling [9]- [12].…”

Section: Variable Window Length Methodsmentioning

confidence: 99%

“…Usually these algorithms require an integer number of cycles of the fundamental component in order to obtain better results [3]. This is a straightforward procedure when the signal has a constant fundamental frequency.…”

Section: Introductionmentioning

confidence: 99%

Variable window length applied to a modified Hanning filter for optimal amplitude estimation of power systems signals

Mendonca

Martins

Pinto

et al. 2015

2015 IEEE Power &Amp; Energy Society General Meeting

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“…The time-domain approaches, such as the instantaneous p-q method, suffer from errors in case of grid distortions and PLL dynamics. The frequency-domain methods, on the other hand, utilize the discrete Fourier transform (DPF), or the recursive DFT algorithms [12], for the individual harmonic estimation of nonlinear currents. This section presents the Hanning-windowed FFT for reference current generation (RCG) for the CHB-APF.…”

Section: A Resonant Current Controller Designmentioning

confidence: 99%

“…Systematic design guidelines for the CHB-APF have not been addressed in the previous studies. In this paper, an effective controller design methodology for the CHB-APF is proposed, including a proportional-resonant (PR) current controller, a dc-link voltage balancing controller (VBC) and the Windowed-FFT algorithm [11], [12] for reference current generation (RCG). This paper is organized as follows.…”

Section: Introductionmentioning

confidence: 99%

Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers

Han¹

2012

Journal of Power Electronics

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This paper presents control strategies for cascaded H-bridge multilevel active power filters (APFs). A current loop controller is implemented using a proportional-resonant (PR) regulator, which achieves zero steady-state error at target frequencies. The power balancing mechanism for the dc-link capacitor voltages is analyzed and a voltage balancing controller is presented. To mitigate the picket-fence effect of the conventional FFT algorithm under asynchronous sampling conditions, the Hanning Windowed-FFT algorithm is proposed for reference current generation (RCG). This calculates the frequency, amplitude and phase of individual harmonic components accurately and as a result, selective harmonic compensation (SHC) is achieved. Simulation and experimental results are presented, which verify the validity and effectiveness of the devised control algorithms.

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On the Processing of Harmonics and Interharmonics: Using Hanning Window in Standard Framework

Cited by 199 publications

References 3 publications

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Numerical Simulation of Fluctuating Wind Effects on an Offshore Deck Structure

Variable window length applied to a modified Hanning filter for optimal amplitude estimation of power systems signals

Control Strategies for Multilevel APFs Based on the Windowed-FFT and Resonant Controllers

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