IEEE Power & Energy Magazine - March/April 2020 - 62

The CURENT LTB utilizes distributed software modules
to establish a systemic testing framework where multiple
interoperable software packages work simultaneously.
room functions, including state estimation, contingency
screening, security assessment, and generation scheduling,
are also integrated as modules, implementing both standard algorithms and research prototypes. Note that in the
effort of developing the LTB, existing software packages,
both commercial and open source, can be evaluated and
utilized whenever possible to achieve efficiencies.
The main contributions of the LTB as a virtual power
grid for research and testing are as follows:
✔✔ the design of a decoupled software architecture for
representing the large-scale power system dynamics
and cyber control systems
✔✔ the development of a distributed messaging environment for integrating interoperable software modules
for simultaneous execution and systematic testing
✔✔ the development of a tool for visualizing the data and
interacting with the software modules in runtime.

LTB Architecture for Decoupled
Closed-Loop Testing
A closed-loop testing architecture is proposed for the LTB
to leverage modular software and distributed messaging for
developing full-featured virtual power systems with simula-

tion, monitoring, energy management, and closed-loop control
capabilities. The CURENT LTB utilizes distributed software
modules to establish a systemic testing framework where multiple interoperable software packages work simultaneously to
represent the online closed-loop power system operation.
The LTB architecture integrates categories of software
modules using distributed messaging. To characterize the
modern power systems with physical dynamics and dataenabled applications, the software pieces are divided into
four categories, as shown in Figure 1. Tools are packaged
as modules with their data interfaces properly defined for
communication and simultaneous execution. Modules can
be distributed over multiple processes or computers for parallel execution.

Simulators, Test Systems, and Scenarios
The simulators provide interfaces for querying the
parameter data and streaming time-stamped raw simulation data. Any simulator can be interfaced with the LTB
architecture if it provides the program interfaces for
workflow control and data acquisition during runtime.
Three simulators-ANDES, GridDyn, and OPAL-RT ePHASORsim-have been integrated with possible extension

EMS

Control Systems

Economic Dispatch

Historian and
Visualization

s

nt

ie

...

Cl

Base Test Systems

High Renewable
Scenarios

Power System
Simulator

ie

Distributed
Messaging
Modules:
Server

s
nt

ie
Cl

Simulators, Test Systems, and Scenarios

Cl

AGC

Wide-Area Damping
Control

Extended AGC
Control

System Separation
Control

s

...

ts

Contingency
Screening

Substation Simulators

nt

Cl
ien

State Estimation

PMU Measurement
Simulator

RTU Measurement
Simulator

Control Signal
Receiver

Data Concentrator
...

figure 1. The CURENT LTB architecture. AGC: automatic generation control; PMU: phasor measurement unit; RTU:
remote telemetry unit.
62	

ieee power & energy magazine	

march/april 2020



IEEE Power & Energy Magazine - March/April 2020

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - March/April 2020

Contents
IEEE Power & Energy Magazine - March/April 2020 - Contents
IEEE Power & Energy Magazine - March/April 2020 - Cover2
IEEE Power & Energy Magazine - March/April 2020 - 1
IEEE Power & Energy Magazine - March/April 2020 - 2
IEEE Power & Energy Magazine - March/April 2020 - 3
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IEEE Power & Energy Magazine - March/April 2020 - 96
IEEE Power & Energy Magazine - March/April 2020 - Cover3
IEEE Power & Energy Magazine - March/April 2020 - Cover4
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