IEEE Electrification - March 2021 - 70

and the other is used to receive signals from the control
center and send them to the RTDS, representing quantum
communication. The flowchart of the algorithm running
in the remote server is depicted in Figure 4(c). The User
Datagram Protocol (UDP) is utilized in this testing environment, meaning any UDP packet whose destination IP and
port match those of the receiver will be received. When a
data packet sent from the RTDS is received by the control
center, a given number of quantum key bits are consumed
in the key pool. The key bits are continuously generated by
the QKD simulator and are then added into the key pool.
An existing design of the QKD-based NMs testbed is
illustrated in Figure 5, where three microgrids are connected
with each other. The control centers in different microgrids
are modeled in the same server sharing the same IP address

but having different ports. Each control center is assigned
three different ports-one used to receive measurements
from the RTDS and the others to receive data from other
two control centers. Six GTNETx2 cards with different IP
addresses are utilized, where three of them are used to send
measurements and three are to receive control signals. Six
QKD systems are established in the remote server, where
three of them are for the communications between
neighboring microgrids, and the other three are for the
communications between control centers and local controllers within the same microgrid. Each QKD system is associated with a key pool, meaning that the keys generated by
each QKD system are stored in a separate key pool, and
whenever there is a need to extract keys from a key pool, a
given number of bits will be consumed from that key pool.

Control
Center
Main Power
Grid

QSM

l

Local
Controller
Basis Z
Basis X

0

1

0

1

C

e
nn

ha

lC

a
sic

las

0

1

Basis X 0

1

Basis Z

nt

a
Qu

um

n

an

Ch

el

Classical
Channel
Cl
a
Ch ssic
an al
ne
l

Laser
Key
Generation

Loads

Key Pool

Loads

Key Consumption
PVs

Battery
Plaintext m

Shared Key k
Shared Key k
Ciphertext Ek (m)
Decryptor
Encryptor

Plaintext m

(a)

QSM
Loads

Storages
Control
Center

QSM

Loads

Wind

QSM

QSM
QSM

PVs

Diesel

PVs
Main
Power
Grid

QSM
QSM

Loads

Classical Communication
Quantum Communication

(b)
Figure 3. Examples of the QKD-based microgrid and NM architectures. (a) The QKD-based microgrid architecture. (b) The QKD-based NM architecture. (Source: Tang et al.) QSM: quantum-secure microgrid; PVs: photovoltaics.

70

I E E E E l e c t r i f i cati o n M agaz ine / MARCH 2021



IEEE Electrification - March 2021

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