Abstract
In a DC microgrid system connected to photovoltaic distributed generation system, DC-DC converters play an important role to perform various functions. In this chapter, a DC microgrid system is presented in which DC-DC converter is utilized to regulate the DC bus voltage under different operating conditions. This chapter focuses on design, modeling, and control of a DC-DC converter. Considering DC-DC buck converter as an example, a systematic procedure is explained to obtain its mathematical model using the state-space averaging (SSA) approach. The steady-state and dynamic models of the buck converter connected to PV systems are derived. Finally, a control design algorithm is discussed to regulate the DC bus voltage in the presence of variations in PV voltage, DC busload, and reference DC bus voltage. The simulation and experimental results are demonstrated in order to validate the controller performance under various aforementioned operating conditions.
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