Overview of HVDC Transmission

Bahrman, M.

doi:10.1109/psce.2006.296221

Cited by 51 publications

(24 citation statements)

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“…It is proposed that the n-phase MMST, shown in Fig 2, is operated such that symmetrical sinusoidal voltages with DC offset are produced at the HV tap arms, as described by Equation (1). The use of symmetrical AC voltage components with no AC zero sequence component means that the AC voltage sums to zero and is not seen by the the HVDC bus.…”

Section: Mmst Topologymentioning

confidence: 99%

“…Unfortunately, in some of these cases the use of a dedicated AC transmission may be uneconomical and unaffordable. Under such circumstances being able to connect directly to a nearby bulk power HVDC transmission network would be desirable [1]. For this reason an inexpensive and efficient HVDC-MVAC conversion method is required-this type of connection is referred to here as a HVDC Tap.…”

Section: Introductionmentioning

confidence: 99%

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A Novel Multi-Modular Series HVDC Tap

Tang¹,

Watson²,

Wheeler³

et al. 2017

13th IET International Conference on AC and DC Power Transmission (ACDC 2017)

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Tapping energy from a HVDC transmission line to serve small remote communities has been considered by researchers and HVDC manufacturers since the 1960s. Many HVDC taps proposed consider the performance of diodes, Thyristors and GTOs and the utilization of bulky and expensive high voltage transformers. This paper proposes a novel HVDC tap topology, the n-phase multi-modular series tap (MMST), which utilises capacitors to decouple HV voltage and IGBT H-bridge sub-modules typically found in modular multilevel converters to transfer HVDC to MVAC. The number of phases and operating frequency can be picked according to the requirement of the application. The feasibility of n-phase MMST has been verified by the results from simulation carried out in PLECS software.

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Section: Mmst Topologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Novel Multi-Modular Series HVDC Tap

Tang¹,

Watson²,

Wheeler³

et al. 2017

13th IET International Conference on AC and DC Power Transmission (ACDC 2017)

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“…HVDC lines and cables are less expensive and have lower losses than those for three-phase AC transmission [11]. For high power application bidirectional PWM converter based multipulse-structure was proposed by Aiguo Xu & Shaojun in [1].…”

Section: Analysis Of Harmonics and Ripple Current In Multi-module Conmentioning

confidence: 99%

“…For high power application bidirectional PWM converter based multipulse-structure was proposed by Aiguo Xu & Shaojun in [1]. A brief overview of HVDC transmission was presented by Michael Bahrman in [11]. Fujii, et.al.…”

Section: Analysis Of Harmonics and Ripple Current In Multi-module Conmentioning

confidence: 99%

“…The outputs of each module are commonly connected with transformers. This approach can give a high-quality output voltage at a much lower switching frequency [6]- [10]. A number of researchers have worked on the multipulse converters, majority of them had one or the other drawbacks, for example with respect to the harmonic contents.…”

Section: Analysis Of Harmonics and Ripple Current In Multi-module Conmentioning

confidence: 99%

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Analysis of Harmonics and Ripple Current in Multi-module Converters with Increasing Number of Modules for High Power Applications

Venkatasubramanian¹,

Natarajan²

2016

IJPEDS

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Controlled rectifiers are considered as the most important hardware part in the field of HVDC systems in transmission lines and can be used for a number of power electronics based system operation, control and utility applications. In this paper, a brief design of a 12-pulse, 24-pulse, 36-pulse and a 48-pulse converter connected to the grid is presented along with the harmonic and ripple current analysis with its comparison statistics and thus providing a justification for the suitable ones. The performance of the 12, 24, 36 and 48-pulse converters are compared for their effectiveness in both quantitatively as well as qualitatively. Further, comparison of the 48-pulse converter on its THD and current ripple which is connected towards the grid with simple pulse width modulation technique is also proposed. It combines all features of the low switching concepts and DC current reinjection techniques. Some basic topological explanation of the controlled rectifiers and simulation results using MATLAB are also presented in this paper in order to justify the harmonic analysis. The simulation results along with the quantitative results shows the effectiveness of the proposed scheme for the cancelation or the elimination of the harmonics result in maximum harmonic mitigation, for high power utility applications, the 48-pulse converter is most fitting to improve the conversion efficiency, low di/dt and dv/dt and active and reactive power controllability. Keyword: Controlled INTRODUCTIONMultipulse converters are suitable for high-power applications with the advantages of ideal harmonic performance and low switching frequency, but it also has an drawbacks of poor regulation and less controllability. With very low switching frequency a bidirectional pulse width modulation (PWM) converter based on multipulse structure has got the same harmonic performance [1]. The harmonic performance and linear regulation capability of such converters can also be analyzed theoretically. The general structure of the multilevel converter is to synthesize a sinusoidal voltage from several levels of voltages, typically obtained from capacitor voltage sources. The so-called 'multilevel' generally starts from three levels. A three-level converter, also known as a 'neutral-clamped' converter, consists of two capacitor voltages in series and uses the center tap as the neutral [13]. To get high dynamic performance the controller parameters are optimized with adequate gain phase margin. A 3-kVA prototype can be built so that the simulation and experiment results could be validated and the proposed converter could be used for high-power conversions [3]. The performance analysis of a 2-level, 24-pulse voltage source converters (VSCs) for high voltage DC (HVDC) system can be used for power quality improvement [4]. High Voltage Direct Current (HVDC)

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