A Single-Stage Closed Loop Control of SC-Based Inverter

Abstract

This work presents a closed loop five-Level grid-connected inverter. The inverter is based on the switched capacitor approach. The suggested architecture has a lower number of components and is able to maintain a voltage balance across the various capacitors in the system. The construction that has been presented offers a number of benefits, including the capacity to produce five-level voltage output, lower current THD, and enhanced efficiency. Additionally, leakage-current in the circuit is eliminated due to the common grounding configuration. The current injected into the grid is controlled by a PI controller. As a result, a carefully controlled current of the desired quality can be injected into the system using just one renewable energy source. In order to test the suggested topology, the level-shifted sinusoidal pulse width modulation scheme is adopted. The design of switched capacitors as well as the computation of power loss in switches is offered. The performance of this suggested inverter topology is evaluated in comparison to other topologies that are recently presented in the literature. In addition, the power losses and efficiency are calculated using thermal modeling of the topology in PLECS software. MATLAB-2018/Simulink is used to simulate and analyze the PV-connected grid system.