Abstract
The voltage controlled buck converter by constant-frequency pulse-width modulation in continuous conduction mode gives rise to a variety of nonlinear behaviors depending on the circuit parameters values, which complicate their analysis and control. In this paper, a description of the DC/DC buck converter and an overview of some of its chaotic dynamics is presented. A solution based on the optimized PID controller is suggested to eliminate the observed nonlinear phenomena and to enhance the dynamics of the converter. The parameters of the controller are optimized with the Spotted Hyena Optimizer (SHO) which uses the sum of the error between the reference voltage and the output voltage as well as the error between the values of the inductor current in every switch opening instant to determine the fitness of each solution. The simulations results in MATLAB proved the efficiency of the proposed solution.
Highlights
DC-DC switched mode power converters have been widely used in many industrial and domestic applications such as hybrid cars, photovoltaic solar energy applications, cell phones chargers, etc. due to their high efficiency compared to the conventional linear regulators
The use of fuzzy logic complicates the control system and requires considerable computation time and a large memory space, while the use of the controllers based on metaheuristic algorithms ensure, at least, the same performance as the fuzzy controllers with less complexity and implementation cost [1921]
Most of previous works that use this type of controller are using the Integral Absolute Error (IAE) as an adaptation coefficient which is insufficient to estimate the fitness of each solution during the search
Summary
DC-DC switched mode power converters have been widely used in many industrial and domestic applications such as hybrid cars, photovoltaic solar energy applications, cell phones chargers, etc. due to their high efficiency compared to the conventional linear regulators. Controllers based on linear theory can be used due to their easy and low implementation cost and the good performance around the operating point [1, 2] They do not take into consideration the nonlinear phenomena that can occur in the converter in high frequencies or when one of the parameters of the converter changes [3,4,5,6]. Using the powerful tools of MATLAB and the state-space model of the buck converter as an example, we designed a PID regulator that guarantees both global stability of the system and parameter disturbance rejection (load, input voltage, reference voltage) This design is based on the Spotted Hyena Optimizer (SHO) to determine the optimum gains of the controller using appropriate adaptation coefficients. Bakria et al.: Chaos Control and Stabilization of a PID Controlled Buck Converter Using the
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