DC-side harmonic analysis and DC filter design in hybrid HVDC transmission systems

Liao, Jianquan; Zhou, Niancheng; Wang, Qianggang

doi:10.1016/j.ijepes.2019.06.013

Cited by 21 publications

(4 citation statements)

References 22 publications

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“…The DC filter incorporates three sets of high-voltage capacitors, with each composed of four capacitor units connected in parallel within a bridge arm. These capacitors play a vital role in managing voltage drops and are the most vulnerable components within DC filters, exhibiting the highest failure rate [17][18][19][20]. The equivalent capacitances for these sets are designated as C 1 , C 2 , and C 3 , with Z 2 and Z 1 denoting the equivalent impedances below C 3 and the combination of C 1 and C 2 , respectively.…”

Section: Details Of DC Filter Ground Faultsmentioning

confidence: 99%

An Improved Fault Localization Method for Direct Current Filters in HVDC Systems: Development and Application of the DRNCNN Model

Liu,

Qiao

et al. 2024

Machines

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This paper focus on direct current (DC) filter grounding faults to propose a novel dilated normalized residual convolutional neural network (DRNCNN) fault diagnosis model for high-voltage direct current (HVDC) transmission systems. To address the insufficiency of the traditional model’s receptive field in dealing with high-dimensional and nonlinear data, this paper incorporates dilated convolution and batch normalization (BN), significantly enhancing the CNN’s capability to capture complex spatial features. Furthermore, this paper integrates residual connections and parameter rectified linear units (PReLU) to optimize gradient propagation and mitigate the issue of gradient vanishing during training. These innovative improvements, embodied in the DRNCNN model, substantially increase the accuracy of fault detection, achieving a diagnostic accuracy rate of 99.28%.

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Section: Details Of DC Filter Ground Faultsmentioning

confidence: 99%

An Improved Fault Localization Method for Direct Current Filters in HVDC Systems: Development and Application of the DRNCNN Model

Liu,

Qiao

et al. 2024

Machines

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“…The authors in refs. [16][17][18] analysed that the winding current is mainly 6k�1 harmonic, and the content of each harmonic does not change much with the power. Li et al [19] studied the winding and core vibration during the whole operation, found the vibration characteristics are different in different states, and the vibration dominant frequency is concentrated at 200 and 400 Hz, which is different from the power transformer concentrated at 100 Hz.…”

Section: Introductionmentioning

confidence: 99%

“…The authors in refs. [16–18] analysed that the winding current is mainly 6k±1 harmonic, and the content of each harmonic does not change much with the power. Li et al.…”

Section: Introductionmentioning

confidence: 99%

Axial and radial electromagnetic‐vibration characteristics of converter transformer windings under current harmonics

et al. 2022

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The winding current harmonic content of converter transformer in operation is rich. However, affected by harmonics, the radial vibration characteristics are quite different from the power transformer, structural loosening and deformation caused by winding vibration are more prominent. Therefore, in view of the influence of current harmonics on axial and radial vibrations, this study builds a 3D winding electromagnetic vibration finite element simulation model, analyses the components and contents of current harmonics, compares the leakage flux and vibration distribution under the fundamental, harmonic and superimposed currents. The correlation relationship between the harmonic components and axial and radial vibration characteristics is obtained, and the vibration measurement test of ±800 kV converter transformer in operation is carried out to verify the correctness of the analysis method. The results show that the winding radial vibration amplitude will exceed the axial vibration affected by harmonics. More importantly, under the superposition of the fundamental, 5th and 7th harmonic current, the vibration contribution of the converter transformer tank is mainly radial vibration, and the vibration dominant frequency is shifted from 100 Hz under the fundamental current to 400 Hz.

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“…e π model is suitable for analysis at low frequencies [29], whereas the universal line model is most appropriate for underground and submarine cables [33][34][35]. Other researchers used different methods for calculating the transmission line parameters [36][37][38][39][40][41][42][43][44][45][46][47] and the PSCAD/EMTDC program based on the CIGRE Benchmark to study the simulation models.…”

Section: Introductionmentioning

confidence: 99%

Effects of Conditional Changes on High-Voltage Direct Current Transmission Line Characteristic

Pothisarn

Ngaopitakkul

Leelajindakrairerk

et al. 2022

Journal of Electrical and Computer Engineering

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The high-voltage direct current (HVDC) transmission system, which links the Gurun Substation of the National Electric Authority of Malaysia (Tenaga Nasional Berhad, TNB) with the Khlong Ngae Station of the Electricity Generating Authority of Thailand (EGAT), has been extensively researched to achieve the highest quality because it is the largest of its kind in Thailand, and there is a plant to expand its transmission power. However, the impact on the whole system is under-researched. To study and develop this system, the HVDC transmission line is modelled with the MATLAB/Simulink program and a laboratory setup to investigate the effect of transmission line distance, load power, and voltage on power loss, voltage drop, and waveform. The HVDC transmission line parameters are calculated from the actual transmission line parameters and converted to the simulation model parameters using the per-unit method. The model is verified and tested by the simulation program before creating the experimental setup. The simulation and experimental results demonstrate the effects of changing system conditions via the three aspects. All the three conditions directly affect the HVDC transmission line; nevertheless, they affect each aspect differently.

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DC-side harmonic analysis and DC filter design in hybrid HVDC transmission systems

Cited by 21 publications

References 22 publications

An Improved Fault Localization Method for Direct Current Filters in HVDC Systems: Development and Application of the DRNCNN Model

An Improved Fault Localization Method for Direct Current Filters in HVDC Systems: Development and Application of the DRNCNN Model

Axial and radial electromagnetic‐vibration characteristics of converter transformer windings under current harmonics

Effects of Conditional Changes on High-Voltage Direct Current Transmission Line Characteristic

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