W. Q. FAN ET AL. 1219
Table 1. Data sheet of TSC split-phase compensation test.
Note: A1 represents the first unbalanced load group in A-phase, B1 repre-
sents the first unbalanced load group in B-phase, A2 represents the second
unbalanced load group in A-phase, the three current values represent the
current in the A,B,C phase respectively.
Table 2. Data sheet of power supply harmonic.
Then the three-phase current unbalanced level can be
expressed b y :
max( ,,) min( ,,)
%
abc abc
av
III III
PVIR I
100%
(2)
As shown in the Table 1, we can see that when the
un-balanced load occurred in the grid, the main controller
can give TSC spilt-phase compensation units switching
order according to the TSC’s switching state and drasti-
cally reduce the current unbalanced level, with th e inten-
tion of unbalanced compensation of The Device.
4.2.3. Fi lter Test
Reactors are connected in series with the capacitors in
the TSC branch to compose the filter, but it can only fil-
ter certain times harmonic, we take the fifth harmonic for
example, Table 2 shows the rest harmonic current in the
grid when the fifth harmonic with the current of 40.7 A
was injected in the grid and two-TSC banks were
switched on. We can see from the table that after two
units TSC’s switching, the rest harmonic current in the
grid is 14.37 A and the harmonic suppression rate attains
to 64.70%, at the same time the test can verify the filter
functio n o f The Device.
5. Conclusions
The Device is a multifunctional compensation device
with a high cost-performance rate, the field test and si-
mulation in the RTDS system can verify that the device
can realize the rapidly continuous reactive power com-
pensation, at the same time has the ability to co mpensate
unbalanced load, filter and harmonic prevention, so it is
worth popularizing to improve power factor and power
quality.
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