IEEE Electrification - December 2020 - 56

mutual support relationship, while the off-grid mode
enables the microgrid to block the influence of grid failures and has the ability to reduce load loss under isolated
grid operation. A microgrid is equivalent to a single controlled unit from the viewpoint of the power grid, which
can provide power grid support, improve energy efficiency,
save energy, and reduce consumption. For the users in the
microgrid, it can meet the power supply safety and power
quality requirements.
The development of the microgrid has been very rapid,
and it is widely applied in industrial and commercial
parks, islands, the military, and other fields. By the end
of 2018, 367 microgrid projects were completed, 217
microgrid projects were under construction, and the total
installed capacity was 8.4 GW. The user classification and
proportion of microgrid projects are shown in Figure 2, in
which the shaded part indicates the projects to be built.
The microgrid is mainly used in industrial and commercial parks.

Microgrid
Wind
Power

Energy
Storage

Charging
Station

Control

Grid

PV Power

On
Status
Forecasting

Off

Others

Figure 1. A conceptual graph of a microgrid. (Source: TBEA Xinjiang
Sunoasis Co., Ltd.; used with permission.)

Completed 367
Microgrids

217 Microgrids
Under Construction

0.5%

3%
6%
Others
Campus
Military

13.4%

14%

Microutility
15%
Island
17%
Commercial and
Industrial
23%

3%
2%
0.2%

Figure 2. The proportion of micronetwork projects in different areas
in 2018.

I E E E E l e c t r i f i cati o n M agaz ine / DECEMBER 2020

By the second quarter of 2019, the number of microgrid
projects in operation and planned in the world had rapidly in--
creased to 4,475, with a total installed capacity of 26,965 MW.
China is the second largest microgrid market in the world,
where about 80% of the projects will be built. The largescale construction of microgrids puts forward higher
requirements for the study of the planning, construction,
and operation of microgrids. Microgrids will be an indispensable part of smart grid construction. In China, vigorously promoting microgrid technology is a strong support
to adjust the energy structure, solve power consumption
problems in remote areas, and protect the environment.
In this article, we introduce a demonstration industrial
park microgrid in China that is designed and built by
Tebian Electric Apparatus (TBEA) Xinjiang SunOasis Co.,
Ltd. This company has been focusing on PVs, wind power,
power electronics, and the energy internet for several
years, providing customers with overall solutions for the
development, investment, design, construction, commissioning, and operation of renewable energy projects.
In the field of microgrids, the company develops energy-management systems (EMSs), central controllers, energy-storage systems, and other key products for microgrid
applications. Taking the EMS as an example, TBEA makes
full use of big data, cloud computing, and artificial intelligence techniques to build an energy-management platform called TB-eCloud. This platform can realize the whole
lifecycle operation management of microgrids efficiently,
intelligently, and conveniently, resulting in an increase in
the efficiency of energy utilization of at least 3%.
In addition, the company puts forward unique microgrid
planning and operation options for industrial and commercial parks, data centers, islands, and remote areas. These
options can realize the integration of primary and secondary equipment as well as the flexible scheduling of
microgrids. Figure 3 shows four microgrids constructed by
TBEA: the Xi'an Industrial Park microgrid, Qinghai PV energy-storage power station, Zhuhai dc microgrid, and Dongguan ac/dc-hybrid microgrid, respectively.
The Xi'an Industrial Park microgrid, which can achieve
two-stage demand response based on capacity electricity
price, includes the world's ﬁrst high-voltage, grid-connected PV power station, 1-MW/1-MWh lithium battery energy
storage, and a 960-kW charging station. This park is the
first industrial park microgrid with the aim of exploring
advanced commercial operation modes and new business
models of energy services.
The project in Qinghai consists of a 50.49-MW PV
power station and 15-MW/18-MWh energy-storage systems. TBEA develops its own inverter and the energystorage systems, which aim to increase the annual
accommodation of the PV power generation by about 23%.
Two years of running show that the project not only
improves the output characteristics of the PV power station but also provides ancillary services for the grid, realizing the innovation of the business mode.

IEEE Electrification - December 2020

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