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Only the current of shunt converter will exceed its limit.
According to (13), the limit current of shunt converter is 10.15 A (peak).
The clamping current of shunt converter is required using UPQC-SRI strategy.
The current of shunt converter I Sh is given by I_{text{Sh}} = I_{text{L}} left( {frac{{sqrt {1 - D^{2} } }}{D}cosvarphi - sinvarphi } right) (8).
Region II: When the voltage sag occurs in this area, both the series and shunt converters would exceed their current limits using UPQC-SRI, and then the current of shunt converter needs to be clamped.
Similar(55)
Electromagnetic Transient Program simulation results verify the correctness of the frequency spectrum characteristic analysis of the faulted currents of shunt reactor.
According to the fact that the faulted phase currents of shunt reactors contain only one oscillating frequency before the fault extinction and contain other two different oscillating frequencies when the fault is extinguished, this change of current frequency can be used to distinguish transient faults.
When sampling rate is an integral multiple of the faulted phase current frequency of shunt reactors under permanent faults, an abrupt increase of currents even harmonics which is caused by spectral leakage of the DFT algorithm under non-synchronous sampling can lead to identify transient faults and three-phase reclosing.
Then the current limitation of shunt converter should be I*.
Under this condition, the current injection of shunt converter should be limited.
Therefore, the current limit of shunt converter can be represented as I*.
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