<s>
EMTP	B-Application
is	O
an	O
acronym	O
for	O
Electromagnetic	O
Transients	O
Program	O
.	O
</s>
<s>
It	O
is	O
also	O
a	O
trademark	O
for	O
the	O
commercial	O
version	O
of	O
EMTP	B-Application
.	O
</s>
<s>
The	O
companion	O
circuit	O
model	O
used	O
the	O
trapezoidal	B-Algorithm
integration	I-Algorithm
rule	I-Algorithm
.	O
</s>
<s>
In	O
1966	O
,	O
Hermann	O
Dommel	O
was	O
invited	O
to	O
BPA	O
from	O
Germany	O
to	O
work	O
on	O
the	O
development	O
of	O
a	O
software	O
named	O
Electromagnetic	O
Transients	O
Program	O
(	O
EMTP	B-Application
)	O
.	O
</s>
<s>
The	O
EMTP	B-Application
development	O
was	O
part	O
of	O
a	O
project	O
for	O
the	O
development	O
of	O
load-flow	O
and	O
stability	O
analysis	O
software	O
at	O
BPA	O
.	O
</s>
<s>
This	O
project	O
was	O
directed	O
by	O
W	O
.	O
F	O
.	O
Tinney	O
whose	O
fundamental	O
contributions	O
to	O
the	O
solution	O
of	O
sparse	B-Algorithm
matrices	I-Algorithm
enabled	O
EMTP	B-Application
and	O
other	O
packages	O
to	O
simulate	O
large	O
power	O
systems	O
.	O
</s>
<s>
The	O
development	O
of	O
EMTP	B-Application
was	O
then	O
taken	O
over	O
and	O
significantly	O
accelerated	O
by	O
W	O
.	O
Scott	O
Meyer	O
.	O
</s>
<s>
In	O
1981	O
,	O
the	O
Development	O
Coordination	O
Group	O
(	O
DCG	O
)	O
of	O
EMTP	B-Application
was	O
proposed	O
and	O
formed	O
by	O
BPA	O
in	O
which	O
Hermann	O
Dommel	O
maintained	O
his	O
participation	O
.	O
</s>
<s>
Over	O
the	O
following	O
years	O
,	O
several	O
organizations	O
became	O
members	O
of	O
DCG-EMTP	O
to	O
contribute	O
research	O
,	O
development	O
and	O
field	O
tests	O
.	O
</s>
<s>
In	O
1984	O
BPA	O
left	O
the	O
DCG	O
and	O
W	O
.	O
Scott	O
Meyer	O
continued	O
independently	O
and	O
personally	O
developing	O
with	O
the	O
existing	O
EMTP	B-Application
code	O
under	O
the	O
new	O
name	O
EMTP-ATP	O
in	O
his	O
free	O
time	O
.	O
</s>
<s>
ATP	O
is	O
acronym	O
of	O
Alternative	O
Transients	O
Program	O
being	O
non-commercial	O
and	O
royalty-free	O
version	O
of	O
EMTP	B-Application
.	O
</s>
<s>
EMTP-ATP	O
was	O
then	O
in	O
1987	O
available	O
in	O
Europe	O
distributed	O
by	O
Leuven	O
EMTP	B-Application
Center	O
at	O
the	O
KU	O
Leuven	O
(	O
Katholieke	O
Universiteit	O
)	O
as	O
the	O
first	O
EMTP	B-Application
version	O
running	O
under	O
operating	O
system	O
DOS	B-Device
on	O
IBM	O
XT/AT	O
and	O
compatible	O
personal	B-Device
computers	I-Device
.	O
</s>
<s>
The	O
DCG	O
pursued	O
the	O
development	O
of	O
EMTP	B-Application
with	O
its	O
members	O
.	O
</s>
<s>
Several	O
full	O
versions	O
were	O
released	O
on	O
mainframe	O
computers	O
and	O
later	O
Unix	B-Application
workstations	O
.	O
</s>
<s>
In	O
1992	O
,	O
J	O
.	O
Mahseredjian	O
,	O
then	O
working	O
at	O
IREQ	O
(	O
Hydro-Québec	O
)	O
converted	O
the	O
EMTP	B-Application
code	O
to	O
work	O
on	O
OS/2	B-Application
,	O
Windows	B-Application
3.1	I-Application
and	O
Windows	B-Application
3.11	I-Application
.	O
</s>
<s>
The	O
first	O
Windows	B-Application
EMTP	B-Application
PC	B-Device
version	O
was	O
commercialized	O
by	O
Hydro	O
One	O
.	O
</s>
<s>
In	O
1996	O
a	O
major	O
EMTP	B-Application
version	O
was	O
released	O
on	O
Windows	B-Application
95	I-Application
.	O
</s>
<s>
At	O
that	O
time	O
it	O
became	O
acknowledged	O
and	O
urgent	O
in	O
the	O
DCG	O
to	O
modernize	O
the	O
EMTP	B-Application
code	O
and	O
improve	O
its	O
numerical	O
methods	O
.	O
</s>
<s>
In	O
1996	O
J	O
.	O
Mahseredjian	O
proposed	O
to	O
the	O
DCG	O
to	O
abandon	O
the	O
old	O
EMTP	B-Application
code	O
and	O
to	O
rewrite	O
it	O
from	O
scratch	O
using	O
modern	O
programming	O
languages	O
,	O
and	O
latest	O
numerical	O
methods	O
.	O
</s>
<s>
His	O
demonstrations	O
and	O
prototypes	O
triggered	O
the	O
EMTP	B-Application
recoding	O
(	O
restructuring	O
)	O
project	O
.	O
</s>
<s>
The	O
EMTP	B-Application
recoding	O
project	O
started	O
in	O
1998	O
by	O
J	O
.	O
Mahseredjian	O
.	O
</s>
<s>
J	O
.	O
Mahseredjian	O
worked	O
later	O
with	O
a	O
small	O
team	O
of	O
developers	O
,	O
including	O
mainly	O
S	O
.	O
Dennetière	O
,	O
O	O
.	O
Saad	O
,	O
C	O
.	O
Dewhurst	O
and	O
L	O
.	O
Dubé	O
,	O
to	O
deliver	O
the	O
new	O
commercial	O
version	O
of	O
EMTP	B-Application
,	O
in	O
2003	O
.	O
</s>
<s>
It	O
was	O
then	O
released	O
under	O
the	O
version	O
named	O
EMTP-RV	O
,	O
RV	O
meaning	O
restructured	O
version	O
.	O
</s>
<s>
This	O
new	O
commercial	O
EMTP	B-Application
code	O
introduced	O
several	O
major	O
improvements	O
in	O
graphical	O
user	O
interface	O
,	O
programming	O
practices	O
and	O
numerical	O
methods	O
.	O
</s>
<s>
The	O
DCG	O
has	O
been	O
dismantled	O
some	O
time	O
after	O
the	O
release	O
of	O
the	O
new	O
commercial	O
version	O
of	O
EMTP	B-Application
.	O
</s>
<s>
It	O
is	O
developed	O
and	O
maintained	O
by	O
the	O
team	O
of	O
J	O
.	O
Mahseredjian	O
inside	O
the	O
EMTP	B-Application
Alliance	O
.	O
</s>
<s>
The	O
fundamental	O
concept	O
of	O
companion	O
circuit	O
model	O
with	O
trapezoidal	B-Algorithm
integration	I-Algorithm
triggered	O
other	O
major	O
software	O
developments	O
.	O
</s>
<s>
MathWorks	O
commercializes	O
a	O
toolbox	O
named	O
Simscape	O
Electrical	O
which	O
is	O
based	O
on	O
the	O
state-space	O
approach	O
for	O
solving	O
electrical	O
circuits	O
and	O
benefits	O
from	O
the	O
powerful	O
control	O
system	O
simulation	O
environment	O
of	O
Simulink	B-Application
.	O
</s>
