At the core the Zhuhai MVDC distribution
network are half-bridge MMCs Tangjia and
Jishan substations, and integrated gate-
commutated thyristor (IGCT)-based cross-
clamped MMC (ICC-MMC) Jishan substation.
The project uses modular multilevel converters,
a three-level hierarchical control system, and
hybrid circuit breakers enhance system
performance.
Figure 6-4 Overview MVDC projects funded the Korean government
.7. The three-terminal network
employs VSCs link the buses with
the ±10 bus. Under optimal control Tangjia
substation, simulation results showed reduced
network loss and enhanced voltage quality.
It supported flexible access new energy
generation, energy storage, charging
equipment, and both and loads.
These converters support bidirectional power flow
and enable fault blocking and system recovery
during faults, ensuring stable operation under
fault conditions.
As shown Figure 6-5, the system operates with
a ±10 pseudo-bipolar configuration, connecting
Tangjia (20 MW), Jishan (10 MW), and Jishan II
(10 MW) substations. This
initiative provided valuable demonstration of
future medium voltage distribution network
design and implementation. Tangjia substation operates
in voltage control mode, while Jishan and II
substations operate power control mode. This ±10 network links
Tangjia substation (20 MW), Jishan substation
(10 MW), and Jishan substation (10 MW),
integrating new energy generation, energy storage,
EV charging equipment, and both and loads
to improve power supply reliability and quality. The
system also incorporates modular transformers
to convert voltage for ±375 and ±110 low-
voltage microgrids.57
MVDC projects around the world
6.1 Case study: Zhuhai MVDC
distribution network, China
The Zhuhai MVDC distribution network was
China’s first demonstration medium voltage
DC distribution system
