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IV. SIMULATION RESULTS
- To verify the application of the SRF-based controllers
applied to the three-phase four-wire system, the UPQC
and line interactive UPS system were simulated with the
simulation tool PSIM version 7.0
- The two, four-leg PWM converters operate at 20 kHz
switching frequency while the unbalanced non-linear loads
are composed of three single-phase diode bridge rectifiers,
followed by R-L loads as flow
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IV. SIMULATION RESULTS
- Phase-voltage is equal to 127 V
- Values of the unbalanced R-L loads are:
Ra = 10Ω, Rb = 7.5Ω, Rc = 5Ω and La = Lb = Lc = 10 mH.
TABLE I: S IMULATION P ARAMETERS
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IV. SIMULATION RESULTS
Fig. 5 shows the input and output voltages of the UPQC.
(a) Input voltages
(vsa, vsb, vsc )
(b) Output voltages
(vLa, vLb, vLc )
Fig. 5 UPQC voltages
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IV. SIMULATION RESULTS
The load currents and the source compensated currents for
independent phase control compensation are shown in Fig.6
(a) Load currents
(ILa, ILb, ILc )
(b) Input currents
(Isa, Isb, Isc )
Fig. 6. UPQC Currents for Independent
Phase Control Compensation
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IV. SIMULATION RESULTS
The load currents and the source compensated currents for
unbalanced load compensation are shown in Fig.7
(a) Load currents
(ILa, ILb, ILc )
(b) Input currents
(Isa, Isb, Isc )
Fig. 7. UPQC currents for Load Unbalance Compensation
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IV. SIMULATION RESULTS
(a) DC-bus voltage
(b) Phase ‘a’
load current
(c) Phase ‘a’
source current
Fig. 8. DC-bus Control for Independent
Phase Control Compensation
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