Integrated predictive control and fault diagnosis algorithm for single inductor-based DC-DC converters for photovoltaic systems

Abstract

Purpose Power converters are an integral part of the energy conversion process in solar photovoltaic (PV) systems which is used to match the solar PV generation with the load requirements. The increased penetration of renewable invokes intermittency in the generated power affecting the reliability and continuous energy supply of such converters. DC-DC converters deployed in solar PV systems impose stringent restrictions on supplied power, continuous operation and fault prediction scenarios by continuously observing state variables to ensure continuous operation of the converter. Design/methodology/approach A converter deployed for a mission-critical application has to ensure continuous regulated output for which the converter has to ensure fault-free operation. The fault diagnostic algorithm relies on the measurement of a state variable to assess the type of fault. In the same line, a predictive controller depends on the measurement of a state variable to predict the control variable of a converter system to regulate the converter output around a fixed or a variable reference. Consequently, both the fault diagnosis and the predictive control algorithms depend on the measurement of a state variable. Once measured, the available data can be used for both algorithms interchangeably. Findings The objective of this work is to integrate the fault diagnostic and the predictive control algorithms while sharing the measurement requirements of both these control algorithms. The integrated algorithms thus proposed could be applied to any converter with a single inductor in its energy buffer stage. Originality/value laboratory prototype is created to verify the feasibility of the integrated predictive control and fault diagnosis algorithm. As the proposed method combine the fault detection algorithm along with predictive control, a load step variation and manual fault creation methods are used to verify the feasibility of the converter as with the simulation analysis. The value for the capacitors and inductors were chosen based on the charge-second and volt-second balance equations obtained from the steady-state analysis of boost converter.

Analysis and circuit design of isolated forward SEPIC converter with minimum-phase stability

“…Nowadays, dc–dc converters have received significant attention and broadly applied in many applications discussed in Wang et al (2019), Venkateswaran et al (2020), Nandha Gopal and Muthuselvan (2020), Sumathy et al (2021), Goudarzian (2019), Goudarzian and Khosravi (2019a), Goudarzian and Edib (2022) and Goudarzian (2023a). The traditional boost converter is normally used to achieve a high dc–dc voltage conversion, owing to its simple structure.…”

A new technique for right half plane zero elimination from dynamics of a boost converter using magnetic coupling concept

“…Conventional boost dc/dc converters are generally used in renewable energy applications with battery systems, energy harvesting, biomedical circuits, battery chargers, electric vehicles, electric drives, switching power supplies, power factor correction circuits and photovoltaic systems for stepping-up the input voltage (Wang et al , 2019; Goudarzian et al , 2019a; Goudarzian et al , 2019b; Nandha Gopal and Muthuselvan, 2020; Venkateswaran et al , 2020; Kamaraj and Nallaperumal, 2020). To reduce the voltage and current stresses on components, dc/dc converters should generally operate in the continuous conduction mode (CCM).…”