Sign-error based adaptive control technique for single stage grid tied SPV system

Abstract

This paper proposes the use of a sign-error based adaptive control for a three phase single stage grid-tied SPV (Solar Photovoltaic) system. The SPV grid tied system, consists of a SPV array, a voltage source converter (VSC), a ripple filter and three phase loads (balanced and unbalanced) connected to a 3 phase AC grid. The SPV array coupled with the VSC does two tasks namely: 1) provides active power to grid; 2) acts as a distributed static compensator (DSTATCOM). DSTATCOM reduces harmonics in grid current within an IEEE-519 standard, improves power factor and regulates the voltage at the point of common coupling. To maximize the power extracted from the SPV array, the perturb and observe approach is used for maximum power point tracking. The proposed SPV grid tied system is modeled in MATLAB software and its performance is simulated at different loads and changing insolation levels.