A multiport power-flow controller for DC transmission grids

Ranjram, Mike K.; Lehn, Peter W.

doi:10.1109/tpwrd.2015.2494499

Cited by 60 publications

(39 citation statements)

References 20 publications

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“…But the major shortcoming of this structure is that the meshed networks might have uncontrolled lines, which means there is insufficient control degrees of freedom to control the power flow of some lines. Therefore, additional devices for DC power flow control are required, which are capable of controlling the power flow in the meshed networks as well as expanding the power operation range …”

Section: Different Topologies Of Mtdc Systemsmentioning

confidence: 99%

“…Therefore, additional devices for DC power flow control are required, which are capable of controlling the power flow in the meshed networks as well as expanding the power operation range. 21 For the long distance transmission occasion such as West to East Electricity Transmission in China, another DC grid topology can be proposed as Figure 1A. This structure contains 2 DC backbones located in the west and east regions respectively and several transmission corridors between them.…”

Section: Different Topologies Of Mtdc Systemsmentioning

confidence: 99%

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Feasibility study of DC circuit breaker-less MTDC systems

Xiao

et al. 2018

Int Trans Electr Energ Syst

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Summary This paper discusses the feasibility of clamp double submodule (CDSM) type modular multilevel converter‐based multiterminal high‐voltage direct current (MTDC) systems. Firstly, the MTDC system structures, the topology of CDSM, the DC fault current blocking capability of CDSM, and the possible control scheme for clearing DC fault with CDSM‐type modular multilevel converters are introduced. Based on the DC fault clearing control scheme, the DC fault impact on the connected AC system with the proposed method is analyzed in detail. Two types of test systems are built for this study, including the MTDC systems with 1 DC backbone and 2 DC backbones suitable for different occasions. The simulation waveforms are compared with those containing high‐voltage direct current circuit breakers. The results show that the connected AC system postfault responses do not diverse too much with the 2 configurations, which proves the feasibility of the DC circuit breaker‐less MTDC system.

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Section: Different Topologies Of Mtdc Systemsmentioning

confidence: 99%

Section: Different Topologies Of Mtdc Systemsmentioning

confidence: 99%

Feasibility study of DC circuit breaker-less MTDC systems

Xiao

et al. 2018

Int Trans Electr Energ Syst

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“…C grids are currently considered as creditable alternatives to AC grids for integrating renewable energy sources (RES) due to the distinct advantages, such as less power conversion and transmission loss, no concerns on reactive power consumption and power angle stability, and flexible power flow controllability [1]- [2]. However, the capacitance inertia of DC grids is far less than the mechanic inertia of conventional AC grids with synchronous generators [3]- [5].…”

Section: Introductionmentioning

confidence: 99%

Adjustable Inertial Response From the Converter With Adaptive Droop Control in DC Grids

Wáng

Wang

et al. 2019

IEEE Trans. Smart Grid

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“…Transient stability studies based on extensive numerical simulation have also been proposed for MT-HVDC systems [7], as well as power flow analyses (e. g. [8]). Despite being debated for a long time, the latter still represents an open research subject, as proved, for example, by [9] and [10]. However, to the authors knowledge, all the studies on MT-HVDC grids presented so far take the existence of an equilibrium point for granted without a formal demonstration.…”

Section: Introductionmentioning

confidence: 99%

Dynamics and Stability of Meshed Multiterminal HVDC Networks

Sánchez

Garcés

Bergna-Diaz

et al. 2019

IEEE Trans. Power Syst.

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This paper investigates the existence of an equilibrium point in multiterminal HVDC (MT-HVDC) grids, assesses its uniqueness and defines conditions to ensure its stability. An offshore MT-HVDC system including two wind farms is selected as application test case. At first, a generalized dynamic model of the network is proposed, using hypergraph theory. Such model captures the frequency dependence of transmission lines and cables, it is non-linear due to the constant power behavior of the converter terminals using droop regulation, and presents a suitable degree of simplifications of the MMC converters, under given conditions, to allow system level studies over potentially large networks. Based on this model, the existence and uniqueness of the equilibrium point is demonstrated by returning the analysis to a load-flow problem and using the Banach fixed point theorem. Additionally, the stability of the equilibrium is analyzed by obtaining a Lyapunov function by the Krasovskiis theorem. Computational results obtained for the selected 4 terminal MT-HVDC grid corroborate the requirement for the existence and stability of the equilibrium point.Index Terms-Offshore wind energy, Multiterminal HVDC systems, HVDC, transient stability, equilibrium point, dynamic systems.

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A multiport power-flow controller for DC transmission grids

Cited by 60 publications

References 20 publications

Feasibility study of DC circuit breaker-less MTDC systems

Feasibility study of DC circuit breaker-less MTDC systems

Adjustable Inertial Response From the Converter With Adaptive Droop Control in DC Grids

Dynamics and Stability of Meshed Multiterminal HVDC Networks

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