DC Pole to Pole Short Circuit Fault Analysis in VSC-HVDC Transmission System

Dessouky, Sobhy S.; Fawzi, M.; Ibrahim, Hamed A.; Ibrahim, Nagwa F.

doi:10.1109/mepcon.2018.8635237

Cited by 16 publications

(6 citation statements)

References 4 publications

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“…The vector control consisting of decoupled inner and outer control loops for modulating power and DC link capacitor voltage, respectively. The inner loop controls the real and reactive power independently using phase locked loop (PLL) and abc-to-dq transformation of voltage or current at PCC [26]. During transformation, the d-axis of the rotating d-q frame of reference is assumed to be aligned with the rotating AC voltage vector V t at PCC.…”

Section: Vector or Indirect Controlmentioning

confidence: 99%

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

Tiwari

Kumar

Gupta

et al. 2023

DGAEJ

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VSC-HVDC systems are widely used to integrate wind farms, asynchronous generations and networks operating at different frequencies. The Multi-terminal (MT) and multi-fed (MF) HVDC’s are the system mainly constituted of VSC’s, to integrate renewable sources and transmitting bulk power to conventional AC grids. A sudden change in the steady state even in adjacent networks may create severe disturbances in the operation of such HVDC systems. The disturbances in AC or DC networks directly influence the performance of systems, particularly in MT-HVDC and MF-HVDC systems. However, the HVDC systems are known for their intelligent control in modulating operational states as and when required. This paper presents the dynamic analysis of MF-HVDC system due to load changes, faults and other disturbances in the adjacent AC networks. The result indicates that VSC-HVDC provides decoupled control of active and reactive power with capability in adjusting operational mode during various minor and major disturbances. Based on the results obtained, the paper proposed a novel sensitivity factor indicating percentage coupling among various line parameters during disturbances. Furthermore, the VSC’s injects harmonic signals on both AC and DC sides of HVDC system. These harmonics voltage or currents signals may get amplified to a dangerously high magnitude at resonance frequencies. Thus, the frequency characteristics of different subsystems are also analyzed using FFT. A ±100 kV, 200 MW bipolar MF VSC-HVDC test systems is used to simulated the results in MATLAB/Simulink software.

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Section: Vector or Indirect Controlmentioning

confidence: 99%

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

Tiwari

Kumar

Gupta

et al. 2023

DGAEJ

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“…While this type is fault is relatively uncommon, they are causal to severe damage, including destroying power switches and massive power interruptions. DC pole-to-pole disturbances are more detectable and dangerous [8].…”

Section: • Pole-to-pole Faultsmentioning

confidence: 99%

A Current Retention Based Protection Algorithm for Dc Microgrids

Srinivas

Modi

2023

JREAS

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Microgrids have been identified as a step towards goals of global green energy generation as they offer attractive options of renewable resource inclusion in decentralized energy networks, thus providing incentive towards meeting a booming energy demand sustainably. They are however impaired by the characteristic nature of Distributed Renewable Energy Resources (DRERs). While DRERs and microgrids offer the advantage of sustainable energy generation and autonomous operation with respect to the traditional grid, their intermittency and unconventional characteristics due to deviation from the traditional power grid structures causes trepidation while opting for them. A cause of concern while employing microgrids in daily use is the peril to personnel and equipment during the occurrence of a fault. To mitigate severe loss of life and property, it is important to develop and design protection algorithms for microgrids. While there is a comparatively large pool of knowledge on AC microgrid protection, DC microgrid protection is challenging and is being focused on by researchers around the world. The unorthodox nature of these networks cause conventional protection algorithms to be unsuitable and make the protection of these microgrids tasking. The work in this paper aims to contribute to efforts in the protection of hybrid microgrids. While the work in this paper is limited to the DC side of the grid, the proposed algorithm is able to detect and identify the location of various types of DC faults. The algorithm is verified on a secondary radial hybrid microgrid and is further compared with existing DC protection algorithms on various performance parameters.

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“…where: U m is the amplitude of the AC side line voltage, ω s is the AC system power frequency angular velocity, α is the initial phase angle. The zero-state response [20] is only generated by the external excitation source u sac , and the DC side current component i lzs of the zero-state response is:…”

Section: Diode Natural Commutation Stagementioning

confidence: 99%

Archives of Electrical Engineering

Zhang,

Bi,

Wang

et al. 2021

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Accurate and reliable fault location is necessary for ensuring the safe and reliable operation of the VSC-HVDC transmission system. This paper proposed a single-terminal fault location method based on the fault transient characteristics of the two-terminal VSC-HVDC transmission system. The pole-to-pole transient fault process was divided into three stages, the time-domain expression of the DC current during the diode freewheel stage was used to locate the fault point, and a criterion for judging whether the fault evolves to the diode freewheel stage was proposed. Taking into account the enhancing effect of the opposite system to the fault current, the DC side pole-to-ground fault network was equated to a fourth-order circuit model, the relationship of fault distance with the characteristic roots of fault current differential equation was derived, and the Prony algorithm was utilized for datafitting to extract characteristic roots to realize fault location. A two-terminal VSC-HVDC transmission system was modelled in PSCAD/EMTDC. The simulation result verifies that the proposed principle can accurately locate the fault point on the VSC-HVDC transmission lines.

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DC Pole to Pole Short Circuit Fault Analysis in VSC-HVDC Transmission System

Cited by 16 publications

References 4 publications

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

Dynamic Analysis of VSC-HVDC System with Disturbances in the Adjacent AC Networks

A Current Retention Based Protection Algorithm for Dc Microgrids

Archives of Electrical Engineering

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