IEEE Power & Energy Magazine - May/June 2019 - 69

dc Line Voltage
60
RTS
HS

(kV)

40
20
0

(MW)

(kA)

-20
0.4

8
6
4
2
0
-2
0.4

250
200
150
100
50
0
-50
0.4

0.42

0.44

0.46

0.48

0.5
Time (s)
(a)

0.52

0.54

0.56

0.58

0.6

dc Line Current
RTS
HS

0.42

0.44

0.46

0.48

0.5
Time (s)
(b)

0.52

0.54

0.56

0.58

0.6

dc Line Power
RTS
HS

0.42

0.44

0.46

0.48

0.5
Time (s)
(c)

0.52

0.54

0.56

0.58

0.6

figure 10. A performance comparison between RTS and HS on the IEEE 39 bus with an HVdc system shows very similar results.

Simulation Accuracy

understanding of the true nature of oscillations in power system
dynamics and select appropriate boundaries for the purpose of
analysis. the project team observed that the criteria based on
electrical distance and voltage sensitivity are useful for identify-
ing the areas vulnerable to artificial transients and determining
the adequate interface buses. As shown in figure 9, increases in
the internal area represented by more detailed modeling can be
used to increase the accuracy of the overall simulations.

existing tsA tools have limitations in observing phenomena,
such as commutation failures, system imbalances, some types
of load dynamics, and the effects of large penetrations of con-
verter-based generators. however, the hs directly enables the
analysis of emt characteristics. Because the emt tool performs
calculations with instantaneous phase values, whereas the tsA
tool does so with root mean square-positive sequence values, a
method that interfaces these differ-
ences is required. Conventionally,
approaches such as curve fitting
TSA
TSA
and fast fourier transforms have
RTS
STATCOM
been used. however, these meth-
RTS
1.5 GW
ods have raised concerns about the
loss of values at the interface and the
computations limiting rts. the
LCC HVdc
project team, therefore, utilized the
energy balance method to transfer
active and reactive power through
345 kV
765 kV
the boundary interfaces to inter-
HVdc
345 kV
connect two different tools in real
765 kV
HVdc
time. Artificial transients or oscil-
lations exist because the tsA uses
positive sequence-analysis, which figure 11. A representation of RTS and TSA boundary for performing an inverterrequires engineers to have a sound side fault of HVdc to compare the performance between full RTS and the HS.
may/june 2019

ieee power & energy magazine

69



IEEE Power & Energy Magazine - May/June 2019

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - May/June 2019

Contents
IEEE Power & Energy Magazine - May/June 2019 - Cover1
IEEE Power & Energy Magazine - May/June 2019 - Cover2
IEEE Power & Energy Magazine - May/June 2019 - Contents
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