Abstract
In this paper a compensation strategy in a distribution system using single phase Transformerless Hybrid series Active power Filter (THSeAF) based on voltage source converters (VSC) is proposed. Sliding Mode Controller is implemented on the load side and source side of the system. The modeling of the system is derived using state space analysis. The frequency response characteristics have been derived and the stability of the system is studied. It is founded that the designed system has good stability margins when the SMC is applied at the source side compared to load side. Simulation results obtained in PSCAD/EMTDC v 4.6 have been observed for power quality issues like voltage sags, voltage swells, voltage distortions and their concurrent occurrence. It is observed that the designed controller for THSeAF works well in obtaining a stable and constant load voltage during these power quality issues. The THD present in the load voltage is near about 1%. A short circuit protection circuit for THSeAF is implemented through a circuit breaker in the simulation. It is observed through simulation that the THSeAF is isolated during the fault and hence protected. The SMC is found to be robust in obtaining a constant load voltage with low THD and an improved power factor.
Published Version
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