IEEE Electrification Magazine - June 2018 - 63

by the dc power supply, and the other 22 by the ac power
supply, with the control and management through the ac/
dc control cabinet.
by adopting the ac/dc hybrid power supply, some of
the ac/dc conversion loss will be reduced to improve
energy efficiency. in a municipal street lighting upgrading project, LeD street lamps were reconstructed through
a dc supply mode by centralized rectification. Meanwhile,
the dc charging pile could be integrated in the position of
LeD lamp so that the problem of eV charging could be
solved. additionally, the intelligent street lighting control
system supports the lighting control of free marshalling,
free dimming control, and other different control strategies to achieve a reasonable ratio of lighting and illumination adjustments. Project flexible lighting strategies
on demand achieve the change of the city lighting
service from passive to active, management from manual to automatic, and the automation of urban lighting management.

Smart Port of Nanjing
Longtan Port is the largest and most modern specialized
container port area on the Yangtze river, where boats'
electrical frequency is usually 50 hz. the Longtan shore
power scheme is to construct a low-voltage shore power
installation at the dock to provide 380-V/50-hz electricity,
with drawer-type switchgear equipped with perfect protection device, among which, ten outgoing lines are
respectively connected to a shore-based control cabinet,
which is connected to a shore-based socket box by a cable
and controls and protects the shore-based socket box. the
capacity of a low-voltage distribution room can provide
ten sets of required capacity of shore power installation,
which includes four sets of a shore power-receiving device
of 100 kVa, four sets of 200 kVa, two sets of 300 kVa, and
the total capacity of 1,800 kVa has designed to construct.
a shore-based control box equipped with hardware protection equipment includes leakage protection breakers,
power arresters, rs-485 signal lightning arrester, flood
switch, etc. the annual electricity consumption of shore
power of Longtan Port is up to 1,495.2 MWh, reducing
exhausted gas by 16.1 tons.

Conclusions
With the development of sensor networks, the iot, cloud
computing, and big data processing, the future development direction of smart city is digitization, informatization, and intellectualization. research into and applications
for a smart city include all aspects of the city's electricity,
transportation, water regime, and buildings and lighting
and provides a comprehensive solution for the city's intelligence have been presented. after years of theoretical and
practical efforts, great achievements in the construction of
a smart city were seen together with some influential
demonstration cities, such as Wuhan and nanjing. it is
foreseeable that with the continual efforts and exploration

in the smart city field, the city would become an efficient
resource-sharing platform that could enhance the visibility of urban elements, with the future becoming profoundly disruptive and revolutionary.

For Further Reading
L. G. anthopoulos and a. Vakali, "urban planning and smart
cities: interrelations and reciprocities," in The Future Internet
Assembly, f. Álvarez, f. Cleary, P. Daras, J. Domingue, a. Galis, a.
Garcia, a. Gavras, s. Karnourskos, s. Krco, M.-s. Li, V. Lotz, h.
Müller, e. salvadori, a.-M. sassen, h. schaffers, b. stiller, G.
tselentis, P. turkama, and t. zahariadis, eds. berlin, Germany:
springer, 2012.
n. taylor buck and a. While, "Competitive urbanism and
the limits to smart city innovation: the uK future cities initiative," Urban Studies, vol. 54, no. 2, pp. 501-519, 2017.
a. Meijer and t. Marcel, (2016, sept.). urban technological
innovation: Developing and testing a sociotechnical framework for studying smart city projects. Urban Affairs Rev.
[online]. 45(2), pp. 363-387. available: https://doi.org/
10.1177/1078087416670274
h. Chourabi, t. nam, s. Walker, J. r. Gil-Garcia, s. Mellouli,
K. nahon, t. a. Pardo, and h. J. scholl, "understanding smart
cities: an integrative framework," in Proc. 45th Hawaii Int. Conf.
System Science (HICSS), 2012.
Y. Jabareen, "Planning for countering climate change: Lessons from the recent plan of new York City-PlanYC 2030,"
Int. Planning Studies, vol. 18, no. 2, pp. 221-242, 2013.
V. scuotto, a. ferraris, and s. bresciani, "internet of
things: applications and challenges in smart cities: a case
study of ibM smart city projects," Bus. Process Manag. J., vol. 22,
no. 2, pp. 357-367, 2016.

Biographies
Jinda Zhu (zhujinda@sgepri.sgcc.com.cn) is the section
leader at the technology Center at nari Group Corporation, nanjing, China.
Houtao Sun (sunhoutao@sgepri.sgcc.com.cn) is with
technology Center, nari Group Corporation, nanjing,
China.
Di Wu (wudi2@sgepri.sgcc.com.cn) is with the technology Center, nari Group Corporation, nanjing, China.
Luyao Chen (chenluyao@sgepri.sgcc.com.cn) is the with
technology Center, nari Group Corporation, nanjing,
China.
Jian Luo (luojian2@sgepri.sgcc.com.cn) is with the
technology Center, nari Group Corporation, nanjing,
China.
Zhuofei Yu (yuzhuofei@sgepri.sgcc.com.cn) is with the
technology Center, nari Group Corporation, nanjing,
China.
Yonghua Chen (chenyonghua1@sgepri.sgcc.com.cn) is
with the technology Center, nari Group Corporation,
nanjing, China.
Jianfu Ni (nijianfu@sgepri.sgcc.com.cn) is with the
technology Center, nari Group Corporation, nanjing,
China.
Kun Huang (huangkun@sgepri.sgcc.com.cn) is with the
nari Group Corporation, nanjing, China.

IEEE Elec trific ation Magazine / j u n e 201 8

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