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Implementation of Unified Power Flow Conditioner with SMC and FLC for Power Factor Improvement

Due to rapid developments in high-power semiconductor switches and their control structures, improvement of stability of power system network turns out to be possible with FACTS controllers of different combinations. Unified Power Flow Controller (UPFC) is one of the most commonly used FACTS device. In conventional UPFC, two voltage source inverters(VSI), one is for Static Synchronous Compensator known as STATCOM and another one for Static Synchronous Series Compensator known as SSSC, functioned from a common DC link provided by a DC storage capacitor. To analyze the performance of UPFC in Sliding Mode Control (SMC), it is simulated in MATLAB. It has been observed that the simulation explains P and Q power flow control. SMC is a non-linear control intended to consider the dynamics of the converter for non-linear on-off behavior of the converter. In general, the fuzzy logic encodes human reasoning into a program. Fuzzy Logic Control (FLC) when used as a controlling method for UPFC has better stability, small overshoot and fast response.