An assessment of RAD based control algorithm for single-stage multitasking grid tied SECS

Abstract

This paper deals with a three phase single-stage multitasking grid tied SECS (Solar Energy Conversion system). A single three leg VSC (voltage Source Converter) topology is used in this work. The SECS not only feeds solar PV (PhotoVoltaic) energy into the grid but also serves the purpose of grid currents balancing, reactive power compensation, harmonics elimination and MPPT (Maximum Power Point Tracking). A feed-forward term for the solar contribution is used to improve the dynamic response for climatic changes. The PV array voltage and hence the dc link voltage is continuously adjusted to achieve MPPT. A RAD (Round Adaptive Detection) based algorithm is proposed for the control of three phase VSC. The system is modeled and simulated on MATLAB based platform. A wide range of simulation results are shown to demonstrate all features of proposed system. Moreover, all salient intermediate control signals are provided for assessment of control algorithm. The THD (Total Harmonics Distortion) of grid current has been found well under IEEE-519 standard.