Novel Controllable-Line-Commutated Converter for Eliminating Commutation Failures of LCC-HVDC System

Gao, Chong; Yang, Jun; He, Zhiyuan; Tang, Guangfu; Zhang, Juanjuan; Li, Tingting; He, Dongshan

doi:10.1109/tpwrd.2022.3183599

Cited by 12 publications

(3 citation statements)

References 20 publications

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“…Wang et al [5] have studied the impact of harmonics on the commutation failure in thyristor inverters. Gao et al [6] have studied the commutation failure in the HVDC LCC system, and the authors have proposed a novel controllable LCC based on combination of semiconductor devices.…”

Section: Introductionmentioning

confidence: 99%

Impact of DC Filters Energies on the Commutation Failure in HVDC CIGRE Benchmark

Chiheb,

Rekik,

Messikh

et al. 2023

Advances in Transdisciplinary Engineering

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The present work is devoted to study and simulate of the functioning of monopolar HVDC LCC system of 500 kV in the presence of an AC power grids voltage disturbance. The CIGRE HVDC LCC Benchmark was simulated using MATLAB/Simulink in presence of AC grids voltage variations: first an overvoltage in AC grid 1 and second voltage drop in AC grid 2 have been simulated. All of these simulations are done to evaluate the robustness of the CIGRE HVDC LCC benchmark against AC grids voltage variation, and to investigate the ability of HVDC link function after disappearing of the simulated variation. The results showed that the HVDC LCC system is sensitive to overvoltage higher than 15 % appearing at the rectifier level, and is sensible too to voltage drops with more than 10 % at the invert level. In these conditions, a commutation failure leading to short-circuit was observed, which interrupt the HVDC link operation, and doesn’t permit re-establishment of link function after fault disappearing. To find the reason of the commutation failure appearing, the magnetic and electrostatic energies stored in DC filter elements have been measured and analyzed. The analysis show that when the magnetic energy is greater than the electrostatic one, the commutation failure appears.

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Section: Introductionmentioning

confidence: 99%

Impact of DC Filters Energies on the Commutation Failure in HVDC CIGRE Benchmark

Chiheb,

Rekik,

Messikh

et al. 2023

Advances in Transdisciplinary Engineering

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show abstract

“…Ref. [7] proposes a new type of controllable line commutated converter (CLCC) topology with controllable shutdown capability based on the design idea of mixing full-control and half-control devices, but the main branch IGBT through-current is too large, and the total valve loss increases. Ref.…”

Section: Introductionmentioning

confidence: 99%

A Dynamic Nonlinear VDCOL Control Strategy Based on the Taylor Expansion of DC Voltages for Suppressing the Subsequent Commutation Failure in HVDC Transmission

Li,

Han,

Liu

et al. 2023

Energies

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Subsequent commutation failure in high-voltage DC transmission systems seriously emphasizes the safe and stable operation of power systems. Via analyzing the mechanism of commutation failure and the principle of voltage-dependent current order limiter (VDCOL), this paper proposes a dynamic nonlinear VDCOL control strategy based on the Taylor expansion of DC voltage for suppressing subsequent commutation failure. To solve the problem of fluctuating DC current command value caused by a large drop in DC voltage, this paper constructs a nonlinear VDCOL control that can be dynamically adjusted according to the AC bus voltage level, and Taylor expansion of DC voltage is used to obtain its first-order and second-order differential components. Different scales of differential elements are chosen to predict the DC voltage compensation value while balancing sensitivity and accuracy. The compensated DC voltage, used as the starting voltage of VDCOL, is input to the VDCOL control constructed in this paper to suppress the subsequent commutation failure of the transmission system by reducing the fluctuation of the current command value. Finally, the standard test model of HVDC is established based on the actual parameters, and the simulation results show that the Method proposed in this paper has an effective suppressing effect in the case of single-phase or three-phase faults of different severity and is conducive to the restoration of the system power transmission.

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“…Yu and Pang (2022) proposed a pilot protection scheme by using the random matrix for DC lines in the symmetrical bipolar MMC-HVDC grid. Gao et al (2022)…”

Section: Introductionmentioning

confidence: 99%

A novel primary and backup relaying scheme considering internal and external faults in HVDC transmission lines

Swetapadma

Agarwal²,

Abdelaziz

et al. 2022

Front. Energy Res.

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Discrimination of different DC faults near a converter end of a DC section consisting of a filter, a smoothing reactor, and a transmission line is not an easy task. The faults occurring in the AC section can be easily distinguished, but the internal and near-side external faults in the DC section are very similar, and the relay may cause false tripping. This work proposes a method to distinguish external and internal faults occurring in the DC section. The inputs are the voltage signals at the start of the transmission line and the end of the converter filter. The difference in voltage signals is calculated and given to an intelligent controller to detect and discriminate the faults. The intelligent controller is designed using machine learning (ML) and deep learning (DL) techniques for fault detection. The long short-term memory (LSTM-) based relay gives better results than other ML methods. The proposed method can distinguish internal from external faults with 100% accuracy. Another advantage is that a primary relay is suggested that detects faults quickly within a fraction of milliseconds. Nevertheless, another advantage is that a backup relay has been designed in case the primary relay cannot operate. Results show that the LSTM-based protection scheme provides higher sensitivity and reliability under different operation modes than the conventional traveling wave-based relay.

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Novel Controllable-Line-Commutated Converter for Eliminating Commutation Failures of LCC-HVDC System

Cited by 12 publications

References 20 publications

Impact of DC Filters Energies on the Commutation Failure in HVDC CIGRE Benchmark

Impact of DC Filters Energies on the Commutation Failure in HVDC CIGRE Benchmark

A Dynamic Nonlinear VDCOL Control Strategy Based on the Taylor Expansion of DC Voltages for Suppressing the Subsequent Commutation Failure in HVDC Transmission

A novel primary and backup relaying scheme considering internal and external faults in HVDC transmission lines

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