Evaluation of DC Links on Dense-Load Urban Distribution Networks

Sciano, Damian; Raza, Ashhar; Salcedo, Reynaldo; Diaz‐Aguiló, Marc; Uosef, Resk Ebrahem; Czarkowski, Dariusz; León, Francisco de

doi:10.1109/tpwrd.2015.2512610

Cited by 42 publications

(28 citation statements)

References 15 publications

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“…However, the power flow in the converter-based DC line can be manipulated by the operator. Therefore, research has been conducted to delay the grid expansion, increase the flexibility of the power system and operate the grid more efficiently by using the converter and DC link-based facility which is capable of power flow control [7][8][9][10][11]. In [7], research has been conducted into delays in the expansion of new facilities by connecting each distribution feeder with an MVDC link as the back-to-back (BTB) type in urban areas where the installation of a new line and transformer is difficult due to high load density and a complicated network.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, research has been conducted to delay the grid expansion, increase the flexibility of the power system and operate the grid more efficiently by using the converter and DC link-based facility which is capable of power flow control [7][8][9][10][11]. In [7], research has been conducted into delays in the expansion of new facilities by connecting each distribution feeder with an MVDC link as the back-to-back (BTB) type in urban areas where the installation of a new line and transformer is difficult due to high load density and a complicated network. In addition, the application of an MVDC link at the normally open point (NOP) for use as soft open point (SOP) can be used to reduce power losses in the distribution network and balance loads between feeders [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

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Enhancing Line Capacity Utilization in Power Transmission System Using Active MVDC Link

et al. 2019

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As a proportion of generation using renewable energy increases in a power system, the need for facility investment is increasing in not only the distribution system but also the transmission system. However, it is inefficient to invest in new equipment to deal with the short peak output of renewable energy generation. For this reason, this paper proposes a method for operating the grid more flexibly, through an optimal operating strategy of the direct current (DC) line at medium-voltage (MV) level, thereby delaying the facility investment in the transmission line. In order to determine the optimal operating point of the converter connected with a DC line, the swarm intelligence-based optimization technique, which can minimize multi-objective function, is used. In addition, in order to overcome the communication dependency of the centralized control, which needs to receive information about the optimal operating point computed by the system operator, this paper proposes a decentralized emergency control (DEC) method in case of a communication fault.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhancing Line Capacity Utilization in Power Transmission System Using Active MVDC Link

et al. 2019

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“…Sometimes, high voltage and long distance transmission lines are required to operate in a parallel configuration with a low voltage class network, which is actually an EMLN. In addition, EMLNs exist in distribution networks, such as the isolated substations loop network in [1][2][3] and certain MV mesh distribution network in [4]. Therefore, EMLN research has broad practical significance.…”

Section: Introductionmentioning

confidence: 99%

Sufficient Condition for the Parallel Flow Problem of Electromagnetic Loop Networks

Yang

Guo

2018

Mathematical Problems in Engineering

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Electromagnetic loop networks (EMLNs) are pervasive in power networks. Their major characteristic is parallel flow. EMLNs with substantial parallel flow are considered to have a parallel flow problem. There is currently a serious disagreement about whether EMLNs have a parallel flow problem, which has resulted in different configurations of national grids. Therefore, this paper proposes a general model of EMLNs and derives the parallel current function, which formulates parallel flow, from the network equations of both the high and low voltage sides of an EMLN. Accordingly, the high and low voltage sides of an EMLN are equivalent to two sets of parallel identical multi-transmission lines. Finally, this paper considers operating margins and derives the sufficient condition under which parallel flow can be ignored. The sufficient condition not only determines whether an EMLN has a parallel flow problem but also reveals simple approaches to visually diminishing parallel flow. If the EMLN satisfies the sufficient condition, parallel flow can be ignored; otherwise, the EMLN needs to operate in a restricted way or to adopt open loop planning.

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“…Cao et al [16] proposed to adopt a back-to-back converter in a distribution network to reduce power losses and improve node voltage profiles. Sciano [17] utilised a short DC line to connect heavily meshed urban distribution networks to increase operational flexibility. Through the above references, we do see power electronic devices help AC distribution networks achieve flexible power transfer.…”

Section: Introductionmentioning

confidence: 99%

Releasing more capacity for EV integration by DC medium voltage distribution lines

Zhang

Chen

Shen

et al. 2017

IET Power Electronics

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With the integration of large-scale electric vehicles (EVs), more capacities of medium voltage distribution networks need to be released. However, there are limited spaces to build new lines, and voltage violation may happen due to the power fluctuation when EVs charge/discharge in a random way. This study proposes to convert some existing AC medium voltage distribution lines to DC and forms a hybrid AC/DC medium voltage distribution network through connecting existing AC lines with a voltage source converter (VSC). Transfer capacity of lines can be increased through DC distribution and flexible power shift between the AC and DC lines can be achieved, based on which more EVs can be accommodated. Configurations of hybrid AC/DC distribution networks are developed, and the capacities released are quantified. A control scheme, which includes a loss minimisation mode and a voltage regulation mode, is proposed in order to optimise real and reactive power outputs of the VSC. Simulation studies are performed to verify the proposed method.

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Evaluation of DC Links on Dense-Load Urban Distribution Networks

Cited by 42 publications

References 15 publications

Enhancing Line Capacity Utilization in Power Transmission System Using Active MVDC Link

Enhancing Line Capacity Utilization in Power Transmission System Using Active MVDC Link

Sufficient Condition for the Parallel Flow Problem of Electromagnetic Loop Networks

Releasing more capacity for EV integration by DC medium voltage distribution lines

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