A super-twisting sliding mode observer for boost inverter-based hybrid photovoltaic -battery system control

Abstract

This paper proposes an observer-based control scheme for a three-phase differential boost inverter in a hybrid PV-battery system. In a conventional control scheme for three-phase differential boost inverter (DBI)-based PV system, the measurements of input inductor current and voltage across output capacitors are required for obtaining the desired voltage at the load end. In a typical three-phase differential boost inverter operation, four voltage sensors and seven current sensors are required to achieve the desired AC voltage. In this paper, an observer-based strategy for elimination of these sensors without compromising power quality is reported. For estimation of boost inverter inductor current and output capacitor voltage, only DC-link capacitor voltage and the load currents are measured. A super-twisting sliding mode observer is used for estimation of the states of the boost inverter. A comparative study between the first-order sliding mode observer and super-twisting sliding mode observer is also presented. The simulation and experimental results show that the proposed observer-based control scheme works satisfactorily under various operating conditions such as sudden change of load, changes in solar insolation, and also under unbalanced load conditions.

Sensorless Control for DC–DC Boost Converter via Generalized Parameter Estimation-Based Observer

“…By incorporating the progressive control method, the sensorless control algorithm can be designed. In addition, the small-signal injection technique [27], extended Kalman filter method (EKF) [28,29], high gain observer [30] and sliding mode observer [31][32][33] are developed to estimate the current of boost converters. For the interleaved boost converter, authors have proposed a sensorless current balance controller on the basis of the phase current estimate [34].…”