High voltage direct current transmission - A Review, Part II - Converter technologies

Okba, Mohamed H.; Saied, Mohamed H.; Mostafa, M. Z.; Moneim, T. M. Abdel

doi:10.1109/energytech.2012.6304651

Cited by 21 publications

(6 citation statements)

References 75 publications

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“…The VSC-HVDC can maintain a constant DC voltage under reversed power flow and avoid load shedding under critical network contingencies. Furthermore, the VSCs in HVDC transmission can be further classified into two and threelevel [8,9]. The modular multilevel converters (MMC) are the next major breakthough in VSC-HVDC technology, minimizing the losses in two and three-level converters.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…High-power AFE converter is a very popular and significant topic in modern power electronics, especially considering the development of the hybrid wind and solar photovoltaic generation and smart grid [1][2][3][4][5][6]. Several specific industry applications of high-power AFE converters are shown in Figure 1, and the high-power AFE converter applications according to main industry branches are listed in Table 1 [7][8][9][10][11][12]. Many researchers and scientists are working on its related topology structures, controller designs and modulation techniques to improve the overall performance of the power system .…”

Section: Introductionmentioning

confidence: 99%

Formulations, Solving Algorithms, Existing Problems and Future Challenges of Pre-Programmed PWM Techniques for High-Power AFE Converters: A Comprehensive Review

et al. 2022

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Considering the development of the hybrid wind and solar photovoltaic generation and smart grid, Active Front-End (AFE) converters for high-power applications are facing significant opportunities and challenges related to power quality and efficiency. The Pre-programmed Pulse-Width Modulation (PPWM) techniques can strictly control the harmonic spectrum of a specified voltage or current waveform generated by a high-power AFE converters, and have been extensively applied to reduce or even eliminate the harmonic distortion with low switching losses for high-power converters in order to deal with these issues aforementioned. For the PPWM techniques with low switching frequency, Selective Harmonic Elimination (SHE) and Selective Harmonic Mitigation (SHM) have been the prevailing solutions and gain widespread popularity, among which SHM can provide further control of the harmonic spectrum in cases of similar switching losses to SHE. Over the past several decades, the applications of SHE and SHM have been extended to high-power AFE converters. Thus, the aim of this study is to provide a comprehensive literature review regarding their various formulations, solving algorithms, and existing problems to high-power AFE converters. In addition, the suggestions for future applications of PPWM in high-power AFE converters are also discussed.

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“…In HVDC transmission systems, converter transformers are the essential components. The insulation systems of HVDC converter transformers could suffer from DC biased AC voltage [2]. To understand the streamer and breakdown mechanisms in HVDC converter transformer insulation under combined voltage waveforms, it is worth investigating the phenomena under DC voltage first.…”

Section: Introductionmentioning

confidence: 99%

Streamer characteristic and breakdown in a mineral oil and a synthetic ester liquid under DC voltage

Xiang

Liu

Wang

2018

IEEE Trans. Dielect. Electr. Insul.

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This paper presents experimental studies of streamer propagation and breakdown in a mineral oil and a synthetic ester liquid under both positive and negative DC voltages. A point-plane electrode configuration with a tip radius of 10 µm was used. Characteristics of streamer length, propagation velocity and shape were analysed based on shadowgraph images obtained at a gap distance of 10 mm using a multi-channel ultra-high speed camera. Under positive polarity, the streamers in both liquids propagate in the 2 nd mode; the stopping length of the synthetic ester is longer than that of the mineral oil at the same applied voltage level. However there is no obvious streamer propagation (less than 10% of the gap distance) under negative polarity even when the applied voltage approaches to the breakdown voltage; the streamers in both liquids stay in the 1 st mode. Breakdown tests at various gaps of 2 mm, 5 mm, 10 mm, 20 mm and 30 mm were also investigated. 50% breakdown voltages of the synthetic ester liquid are lower than those of the mineral oil at all the gap distances investigated under both polarities.

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High voltage direct current transmission - A Review, Part II - Converter technologies

Cited by 21 publications

References 75 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

Formulations, Solving Algorithms, Existing Problems and Future Challenges of Pre-Programmed PWM Techniques for High-Power AFE Converters: A Comprehensive Review

Streamer characteristic and breakdown in a mineral oil and a synthetic ester liquid under DC voltage

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