IEEE Electrification - June 2021 - 68

behavior of wind generation systems as they relate to the
power system control and stability. This CIGRÉ working
group, CIGRÉ WG C4.601, culminated in the publication of
a document that outlined a possible path forward for the
development of so-called generic models for wind turbine
generators in 2007. Around the same time, in 2005, the
WECC started a new task force chartered with attempting
to develop the first set of generic models for WTGs. This
work ended in around 2008/2009 with the development of
the so-called first generation of generic wind turbine generator
models in the WECC. In 2010, the WECC redefined
this task force as the Renewable Energy Modeling Task
Force of the WECC, chartered with developing the second
generation of generic renewable energy system models to
cover wind turbine technologies, PV, and BESS. In late
2010, the International Electrotechnical Commission (IEC)
also started a new task force, IEC TC88 WG27, to develop
an international standard for generic wind turbine generator
models. The WECC effort culminated in around
2015/2016 in the development of a suite of modularized
models that can facilitate the modeling of WTG, PV, BESS,
and even some hybrid plants. The Electric Power
Research Institute (EPRI) has been, and continues to be, a
key technical contributor to these efforts. These models
have been available in the most commonly used commercial
power system simulation software platforms
and are being used by utilities and others in North America
and some other regions. The IEC models are similar in
nature to the WECC models but have some added features,
particularly for doubly fed asynchronous generator
type wind turbines. The IEC models have been adopted
by some software vendors in Europe and are likely to
gain traction in Europe.
The WECC MVS continues, together with many participants
from the industry, to further develop and add to
the suite of modular generic models for IBRs. Over the
past couple of years, two new generic models (named
REGC_B and REGC_C by the WECC MVS) have been proposed
and discussed. The major difference between the
existing REGC_A generic generator/converter interface
and these two new models is that while the REGC_A
model has a current source interface with the network, a
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152.5
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147.5
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142.5
140
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Time (s)
1.15
1.125
1.1
1.075
1.05
1.025
0.975
1
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Time (s)
EMT Domain
60.15
60.1
60.05
60
59.95
59.9
59.85
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Time (s)
Positive Sequence
Figure 5. A comparison of IBR active power, reactive power, voltage magnitude, and system electrical frequency between the EMT domain and
the positive sequence REGC_C model for the load increase and decrease scenario.
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IEEE Electrification Magazine / JUNE 2021
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35
30
25
20
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Time (s)
RMS Voltage Magnitude (p.u.)
Active Power (MW)
Electrical Frequency (Hz)
Reactive Power (Mvar)

IEEE Electrification - June 2021

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