Multi-Interharmonic Spectrum Separation and Measurement Under Asynchronous Sampling Condition

Sun, Zhen; He, Zhengyou; Zang, Tianlei; Li, Fangxing

doi:10.1109/tim.2016.2562278

Cited by 21 publications

(13 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason is that the discrete Fourier transform (DFT) is usually used to extract the fundamental phasor and its measurement errors introduced by the frequency spectrum leakage and the fence effect under asynchronous sampling [18]. The existing of harmonic components amplify the effect of the frequency spectrum leakage and fence effect if the signal is sampled asynchronously.…”

Section: School Of Electrical Engineering Xipu Campus Southwest Jiamentioning

confidence: 99%

See 1 more Smart Citation

Research on fault location scheme for inverter AC transmission line of AC–DC hybrid system

Deng

et al. 2018

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

memberAs the nonlinear characteristics of converters, the harmonic components of fault information hardly decays with the passage of time, which introduces an estimation error in the fault location in the inverter AC transmission line of an AC-DC hybrid system, especially under commutation failure condition. Therefore, a new fault location scheme, which combines the dynamic synchrophasor measurement algorithm and line equivalent impedance/admittance estimation algorithm, is proposed in this paper. The precision of phasor estimation under harmonic environment has been improved. Based on these, the pre-fault data of one circle is applied to estimate the line equivalent impedance and admittance. Finally, the traditional fault location formula based on the two-end information is employed to calculate the fault location. Evaluation results show that the proposed scheme is independent of the fault resistance, fault distance, and fault type. More importantly, it ensures a higher precision of fault location in comparison with the dynamic fault location algorithm, even under commutation failure.

show abstract

Section: School Of Electrical Engineering Xipu Campus Southwest Jiamentioning

confidence: 99%

“…where * and Re[X(t)] denote the conjugate operation and the real part of X (t), respectively. The continuous signal x (t) can be discretized in (18) with the sampling rate f s :…”

Section: Dynamic Synchrophasor Measurementmentioning

confidence: 99%

Research on fault location scheme for inverter AC transmission line of AC–DC hybrid system

Deng

et al. 2018

IEEJ Transactions Elec Engng

Self Cite

View full text Add to dashboard Cite

show abstract

“…On the other hand, the picket-fence effect is dealt with in [27] by a FT-based approach with interpolatory polynomial approximation for waveform reconstruction. Very recently, a multiple-interharmonics spectrum separation algorithm is proposed to distinguish intensive interharmonics in the case the signal is asynchronously sampled [33]. Apart from the DFT, the ESPRIT and Prony-based methods represent valid alternatives within the frequency domain but offers high-frequency-resolution DFT at the price of more computational requirements [14].…”

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.

View full text Add to dashboard Cite

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.

show abstract

“…With the development of smart grids, increasing numbers of power electronic devices have been connected to distribution networks, which inject a large amount of harmonics [1][2][3][4][5]. Various electrical power equipment and electronic products have a strong sensitivity to the harmonics in the distribution network, making harmonic elimination of great importance [6].…”

Section: Introductionmentioning

confidence: 99%

A Piecewise Bound Constrained Optimization for Harmonic Responsibilities Assessment under Utility Harmonic Impedance Changes

Zang

Wang

et al. 2017

Energies

Self Cite

View full text Add to dashboard Cite

Considering the effect of the utility harmonic impedance variations on harmonic responsibility, a method based on piecewise bound constrained optimization is proposed in this paper to evaluate the load harmonic responsibilities. The wavelet packet transform is employed to determine the change times of the utility harmonic impedances. The harmonic monitoring data is divided into several segments where the utility harmonic impedances are considered as constants. Then, the problem of harmonic responsibility assessment under utility harmonic impedance changes are settled by the piecewise bound constrained optimization model. Furthermore, the interior point, the sequential quadratic programming and the active set algorithm are respectively adopted to calculate all the instantaneous harmonic responsibilities of harmonic loads. Finally, the weighted summation is used to calculate the total harmonic responsibility. To demonstrate the validity, simulation tests are carried out on an experimental circuit and the IEEE 13-bus distribution system.

show abstract

Multi-Interharmonic Spectrum Separation and Measurement Under Asynchronous Sampling Condition

Cited by 21 publications

References 26 publications

Research on fault location scheme for inverter AC transmission line of AC–DC hybrid system

Research on fault location scheme for inverter AC transmission line of AC–DC hybrid system

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

A Piecewise Bound Constrained Optimization for Harmonic Responsibilities Assessment under Utility Harmonic Impedance Changes

Contact Info

Product

Resources

About