VGB POWERTECH 10 (2019)

Analysis of a grid integrated wind energy conversion system VGB PowerTech 10 l 2019
Signal mag.
Mag in % of Fundametal
200
0
-200
0,5
0.45
0.4
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
In F i g u r e 14 , the presentation of the
PMSG actual and immediate power is utilizing
the anticipated procedure. In F i g -
u r e 1 5 , the dc-link voltage of the anticipated
system is depicted. At this point, the
dc-link augment time is 0.001 second, peak
exceed time is 0.05 seconds and stable position
accomplish the 0.55 seconds specifically
resolving progression at equivalent
Selected signal: 25 cycles. FFT window (in red): 1 cycles
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Time in sec
Fundamantal (50 Hz)=289, THD=8.00 %
0 200 400 600 800 1,000 1,200
Fig. 16. THD analysis of proposed method.
Frequency in Hz
voltage is 190V correspondingly. In F i g -
u r e 16 , the output THD investigation of
anticipated process is depicted. The THD is
8 % for the productivity of anticipated control
procedure of the grid incorporated
power system. In these consequences, it is
resolute that the synchronize control policy
is the appropriate explanation to remove
the greatest power from the obtainable
wind and diminish the harmonic in the
grid incorporated power system. The anticipated
control procedure is competent
procedure the non-linearity of the power
system and enhanced constancy of grid
voltage and power. The evaluation of anticipated
procedure and obtainable method
is clarified in the sub segment 5.2.
Comparison analysis
In comparison analysis, the two conditions
are investigated and carry out the dc
link voltage policy. Here, the resolving
time, exceed time and expanding times are
investigated. From the above condition, resolving
time, peak exceed time and undershoot
time are investigated. In the evaluation
graphs F i g u r e 17 (a), the anticipated
procedure offers adjoining voltage
value to finest value and shift frequently.
But, the voltage values are very extreme
from the finest one which is not reasonable
for contributing enhanced voltage for the
obtainable method. In F i g u r e 17 (b),
the peak exceed time is the anticipated,
MFO process and FA-ANN procedure are
t= 0.05 seconds, t= 0.055 seconds and t=
0.06 seconds correspondingly. Likewise,
the resolving time is anticipated, MFO process
and FA-ANN procedure are 0.55 seconds
at resultant 190 V, 0.56 seconds at
equivalent 195 V and 0.57 seconds at
equivalent 205 V investigated. This evaluation
demonstrate that the anticipated process
is the optimum process to disbelieving
the nonlinearity in this power system
through huge dependability, extra robust
and fine presentation than the further
methods which are depicted in F i g -
ure 17.
Figure 18 and Figure 17 illustrate
that the contrast investigations of THD in
obtainable process like MFO and FA-ANN.
Tab. 3. Comparison of %THD of existing and
proposed method.
THD
%
PSO
[36]
Existing methods
Proposed
method
FA-ANN MFO MFO-ANN
9.755 11.47 10.96 8.00
Voltage in V
250
200
150
100
proposed
MFO
50
FA-ANN
0
0 0.1 0.2 0.3 0.4 0.5
a)
Time in sec
Voltage in V
b)
350
300
250
200
150
100
proposed
MFO
50
FA-ANN
0
0 0.2 0.4 0.6 0.8 1
Time in sec
Fig. 17. Comparison analysis of dc voltages in (a) case-1 and (b) case-2.
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