Novel Detection Method for Consecutive DC Commutation Failure Based on Daubechies Wavelet with 2nd-Order Vanishing Moments

Lin, Tao; Guo, Zhiwei; Wang, Liyong; Chen, Rusi; Bi, Ruyu

doi:10.3390/en11020261

Cited by 5 publications

(4 citation statements)

References 20 publications

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“…Wavelets were first applied in geophysics to analyse data from seismic surveys, which are used in oil and mineral exploration to get pictures of layering in subsurface rock. For more information about Meyer wavelet, see other studies(); Daubechies wavelet, see other studies(); Fast wavelet see other studies(); and Haar wavelet, see other studies. ()…”

Section: Haar Waveletsmentioning

confidence: 97%

A numerical approach to solve the model of an electromechanical system

Alkan

Aydın

Çoban

2018

Math Methods in App Sciences

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In this paper, the model of an electromechanical system, which is a system of linear differential equations, is studied. Haar wavelet collocation method (HWCM) is applied for finding the approximate solution of the model. HWCM reduces the system of the model into a matrix‐vector form that contains the unknown Haar coefficients, and these coefficients are easily calculated. To demonstrate the validity and applicability of HWCM, numerical solutions of the system for different parameter values in the system are presented. The obtained results demonstrate the efficiency and accuracy of the method. All of the computations are performed via a program written in Mathematica.

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Section: Haar Waveletsmentioning

confidence: 97%

A numerical approach to solve the model of an electromechanical system

Alkan

Aydın

Çoban

2018

Math Methods in App Sciences

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“…The commutation failure immunity index (CFII) proposed in [30] was used This abnormal phenomenon is mainly related to commutation failure. Lin et al [29] indicate that in the process of commutation failure caused by an AC fault, aside from the absolute value of bus voltage, the voltage drop speed also has a large effect on the commutation process. In the Ncut case, although the LOE SC always absorbs reactive power resulting in a lower bus voltage value compared with the Cut2 case, the LOE SC still provides a positive reactive power increment at the instant of system fault, which slows down the process of bus voltage drop, thus avoiding commutation failure to a certain extent.…”

Section: Impact On the Uhvdc Under Inverter Low Voltagementioning

confidence: 99%

Synchronous Condenser’s Loss of Excitation and Its Impact on the Performance of UHVDC

Guo

et al. 2020

Energies

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The synchronous condenser (SC) has a broad application prospect in ultra-high-voltage direct current (UHVDC) systems. The SC’s loss of excitation (LOE) is an important grid-related fault that may cause damage to the UHVDC. However, as the premise of the scientific protection configuration, knowledge of the SC’s LOE feature and its impact on UHVDC is still missing. This article first analyzes the SC’s LOE feature, offering a basic cognition of this fault. Secondly, the LOE SC’s reactive power response to system voltage variation is studied in the single-machine infinite-bus system. This lends a foundation for transient UHVDC research. Finally, the LOE SC’s impacts on steady and transient UHVDC are evaluated, respectively, considering different AC strengths and system faults through PSCAD/EMTDC (V4.6, Manitoba HVDC Research Center, Winnipeg, MB, Canada) simulations. The results show that: (1) LOE the SC absorbs reactive power while maintaining synchronous operation, its excitation current declines monotonically; (2) the LOE SC has an insignificant effect on steady-state UHVDC; (3) the LOE SC can restrain the overvoltage and benefit the rectifier’s transient stability; and (4) to reduce the inverter’s commutation failure, keeping LOE SC is more effective than separating it beforehand, while separating the LOE SC after the system voltage drop performs best. These conclusions could provide insights for the protection’s criterion and operation mode selections.

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“…However, this method cannot guarantee accurate prediction of the commutation voltage and DC current in every fault condition. In references [16, 17], the commutation failure is identified by using the mathematical morphology and wavelet variation to analyse the characteristic of DC current waveforms, whose threshold value depends on large data samples.…”

Section: Introductionmentioning

confidence: 99%

A detection method for HVDC commutation failure based on the variation rate of commutation inductance energy

Liu

Cheng

2022

IET Generation Trans & Dist

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Concerning the insufficient accuracy of the criterion for identifying commutation failure in HVDC transmission systems, a new detection method for commutation failure based on the variation rate of commutation inductance energy is proposed. First, the conducting states of the converter valves in both normal commutation and commutation failure conditions are analysed, and the correlation between the differential of valve‐side line current and the conducting state of the converter in different commutation scenarios is established. On this basis, combining the topologies of D/Y‐bridge converters, a model to calculate the variation rate of commutation inductance energy is built. Then, considering the fault characteristics of DC current, DC voltage and valve currents, it is found that the calculated value of the variation rate of commutation inductance energy is consistent with the actual value under normal commutation conditions but inconsistent under commutation failure conditions. This allows for the construction of a criterion for identifying the commutation failure. Finally, the simulation results obtained with the RT‐LAB platform verify that, the proposed method can detect the occurrence of commutation failure quickly without measuring the valve currents, and it remains accurate when dealing with commutation failure near the threshold.

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Novel Detection Method for Consecutive DC Commutation Failure Based on Daubechies Wavelet with 2nd-Order Vanishing Moments

Cited by 5 publications

References 20 publications

A numerical approach to solve the model of an electromechanical system

A numerical approach to solve the model of an electromechanical system

Synchronous Condenser’s Loss of Excitation and Its Impact on the Performance of UHVDC

A detection method for HVDC commutation failure based on the variation rate of commutation inductance energy

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