Adaptive PID Control of DC-link Voltage via DC/DC Buck-Boost Converter

Abstract

Mainly, a photovoltaic (PV) system is able to generate wide ranges of
voltage and current at terminal output. However, a PV cell is required to
functionally maintain a constant direct current (DC) voltage at a desired
level during real-time variations of incident light illumination and ambient
temperature. To obtain this goal, a power electronic convertor, that is a DC/
DC converter together with control scheme topology, is implemented in this
study. However, a conventional linear PID control law is not suitable to be an
effective controller for regulating the output voltage of a DC/DC converter
due to nonlinearity. An adaptive PID control scheme is proposed to
stabilize the output voltage of the DC/DC converter, in order to maintain and
stabilize the constant DC-link voltage in power line and load variations. The
results of steady state and transient responses show that the performance
of the proposed control scheme is more efficient than the conventional PID
control scheme.
Adaptive PID Control of DC-link Voltage
via DC/DC Buck-Boost Converter

Keywords: DC/DC converter; PID Control; Buck-boost Converter;
Photovoltaic system