Design and Control of Novel Grid Tied Multilevel Filter-less Inverter Using Current based Sliding Mode Control /

Abstract

The role of control techniques is increasing with increase in penetration of renewable energy sources on grid level. The importance of inverters also rises as it balances the supply between the renewable source and grid power system. The issues related to penetration of renewable energy like power quality maintenance, protection against the detection of islanding and maintaining the integrity of grid; control techniques play a vital role. This research work proposed an internal control technique known as current based sliding mode control (SMC), which is applicable on Multilevel inverter (MLI). The aim of proposed research work is to achieve 27 level output voltage by inverter, which approaches sinusoidal wave without using any filters. To control the output of multilevel inverter, current based SMC is implemented in order to increase the robustness, having good dynamic response, a smaller number of voltage ripples and smaller current total harmonic distortion (THD). Moreover, a comparative analysis of SMC is done with the conventional Proportional Integral (PI) controller. To validate the results of SMC applicable on MLI, an experimental setup is arranged in which dSPACE 1202 is used for implementing the control, and hardware in loop (HIL) system is made to achieve the real time results.