Universal Active Filter for Standalone Hydro-Electric System with SPV and Battery Support

The integration of universal active power filter (UAPF) with standalone hydroelectric system having double stage solar photovoltaic (SPV) and bidirectional battery supported for improvement of the system power quality (PQ), is presented in this work. The power from the self-excited induction generator (SEIG) driven by the hydro turbine is the main source of this standalone system. However, when its operating at variable loads, as well as nonlinear loads, etc. the PQ issues are arisen. So, the PQ indices are improved by integrating a UAPF, which consists of two voltage source converters (VSCs) having a common DC link. The voltage qualities are enhanced using the series compensator of UAPF and maintains the harmonics free constant magnitude voltage across the sensitive loads, regardless of any variation in generator voltage. Moreover, the power indices for instance power factor, current harmonics, reactive power, etc. are improved through the shunt compensator of the UAPF, instantaneously along with voltage quality enhancement. The fundamental components of distorted currents of crucial load are extracted by means of improved lowpass generalized integrator (IL-GI) control algorithm, which are further utilized for estimation of the reference signals and the switching pulses, to ensure the effective and efficient power quality improvement during various conditions. The IEEE-519 standard is being followed by the load voltage and the source current.