ABSTRACT:
This paper proposes a combined system of a thyristor-controlled
reactor (TCR) and a shunt hybrid power filter (SHPF) for harmonic and reactive
power compensation. The SHPF is the combination of a small-rating active power
filter (APF) and a fifth-harmonic-tuned LC passive filter. The tuned passive
filter and the TCR form a shunt passive filter (SPF) to compensate reactive
power. The small-rating APF is used to improve the filtering characteristics of
SPF and to suppress the possibility of resonance between the SPF and line
inductances. A proportional–integral controller was used, and a triggering
alpha was extracted using a lookup table to control the TCR. A nonlinear control
of APF was developed for current tracking and voltage regulation. The latter is
based on a decoupled control strategy, which considers that the controlled
system may be divided into an inner fast loop and an outer slow one. Thus, an
exact linearization control was applied to the inner loop, and a nonlinear feedback
control law was used for the outer voltage loop. Integral compensators were
added in both current and voltage loops in order to eliminate the steady-state
errors due to system parameter uncertainty. The simulation and experimental
results are found to be quite satisfactory to mitigate harmonic distortions and
reactive power compensation.
KEYWORDS:
1.
Harmonic suppression,
2.
Hybrid power filter
3.
Modeling
4.
Nonlinear control
5.
Reactive power compensation
6.
Shunt hybrid power filter and thyristor-controlled reactor (SHPF-TCRcompensator)
7.
Thyristor-controlled reactor (TCR)
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig. 1. Basic circuit of the proposed SHPF-TCR
compensator.
EXPECTED SIMULATION RESULTS:
Fig. 2. Steady-state response of the SHPF-TCR
compensator with harmonic generated load.
Fig. 3. Harmonic spectrum of source current in phase
1. (a) Before compensation.
(b) After compensation.
Fig. 4. Dynamic response of SHPF-TCR compensator
under varying distorted
harmonic type of load conditions.
Fig.
5. Dynamic response of SHPF-TCR compensator under the harmonic and reactive
power type of loads.
Fig. 6. Harmonic spectrum of source current in phase
1. (a) Before compensation. (b) After compensation.
Fig. 7. Steady-state response of the SHPF-TCR
compensator with harmonic produced load.
CONCLUSION:
In this paper, a SHPF-TCR compensator of
a TCR and a SHPF has been proposed to achieve harmonic elimination and reactive
power compensation. A proposed nonlinear control scheme of a SHPF-TCR
compensator has been established, simulated, and implemented by using the
DS1104 digital realtime controller board of dSPACE. The shunt active filter and
SPF have a complementary function to improve the performance of filtering and
to reduce the power rating requirements of an active filter. It has been found
that the SHPF-TCR compensator can effectively eliminate current harmonic and
reactive power compensation during steady and transient operating conditions
for a variety of loads. It has been shown that the system has a fast dynamic
response, has good performance in both steady-state and transient operations,
and is able to reduce the THD of supply currents well below the limit of 5% of
the IEEE-519 standard.
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