IEEE Power & Energy Magazine - May/June 2019 - 98

may be restricted to operate as radial configurations due to
uncontrollable power flow issues or the risk of short circuit
currents exceeding the interrupt capability of existing switchgear equipment. allowing meshed network configurations
enhanced through hVdc interties can greatly increase system efficiency and reliability. the first urban area Vsc-hVdc
intertie is being installed in Beijing, china. this demonstration project installs a back-to-back Vsc-hVdc intertie on one
220-kV tie line between two adjacent load areas. these two
load areas have two 220-kV tie lines that are normally disconnected due to system constraints.
in many cases, hVdc interties can be cost-effective solutions, as shown in Figure 3, to address multiple network
expansion and operation issues. Figure 4 illustrates different

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application scenarios of subtransmission hVdc for urban
power grids. Figure 5 shows representative operating configurations and voltage and power ranges of point-to-point or
back-to-back subtransmission hVdc systems. the subtransmission hVdc systems can be implemented with symmetric
monopole or bipole configurations. symmetric monopole
configurations are more likely for urban power grid applications, and it is feasible to implement a subtransmission hVdc
system without converter transformers.

Subtransmission HVdc Applications
in Urban Power Grids
hVdc direct infeed applications supporting the subtransmission network utilize narrow rights-of-way, which should

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External System

External System
(a)

(b)

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(c)

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(d)

figure 4. The application scenarios of subtransmission VSC-HVdc include direct infeed to load centers, interties between
adjacent load areas or substations, and multiterminal systems. (a) HVdc infeed to urban load areas, (b) HVdc intertie of
adjacent load areas, (c) HVdc coupling of critical substations, and (d) a multiterminal HVdc system.
98

ieee power & energy magazine

may/june 2019



IEEE Power & Energy Magazine - May/June 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2019

Contents
IEEE Power & Energy Magazine - May/June 2019 - Cover1
IEEE Power & Energy Magazine - May/June 2019 - Cover2
IEEE Power & Energy Magazine - May/June 2019 - Contents
IEEE Power & Energy Magazine - May/June 2019 - 2
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IEEE Power & Energy Magazine - May/June 2019 - Cover3
IEEE Power & Energy Magazine - May/June 2019 - Cover4
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