Análise e controle do inversor com fonte dividida conectado à rede elétrica

Abstract

This paper proposes the implementation of two control strategies. The first one is called Predictive Control based on Finite State Models (MPC) and the second is the Proportional Integral Linear Controller (PI) associated with the PWM (Pulse Width Modulation). The MPC, to date, has not been analyzed for the Split Source Inverter (SSI). The chosen MPC strategy of control is a Finite Set (FS-MPC - Finite Set MPC) considering a three-phase SSI analysis connected to the grid. The proposed controller implements, through an algorithm, the discrete model of the split source inverter to predict the future behavior of the input and output currents for each switching state. The control action is defined minimizing a cost function that has as parameters the samples of these currents, previously mentioned. In relation to the PI Controller, the modeling of the control meshes of the voltage and current variables is demonstrated. Also, the design criterion are highlighted of controller gains and the modeling of PWM. The SSI was recently constructed as an alternative option for commonly used Impedance Source Inverter (ZSI). This top ology joins the stage of voltage rise and inversion in a single stage and requires the same number of active switches from the conventional Voltage Source Inverters (VSI ), three additional diodes, two passive elements (C and L) and the same eight switching states. The performance of the proposed control strategies are validated through simulation results.

Key-words: Predictive Control based on Finite State Models, Impedance Source Inverter, Split Source Inverter.