Abstract
The high potentiality of integrating renewable energies, such as photovoltaic, into a modern electrical microgrid system, using DC-to-DC converters, raises some issues associated with controller loop design and system stability. The generalized state space average model (GSSAM) concept was consequently introduced to design a DC-to-DC converter controller in order to evaluate DC-to-DC converter performance and to conduct stability studies. This paper presents a GSSAM for parallel DC-to-DC converters, namely: buck, boost, and buck-boost converters. The rationale of this study is that modern electrical systems, such as DC networks, hybrid microgrids, and electric ships, are formed by parallel DC-to-DC converters with separate DC input sources. Therefore, this paper proposes a GSSAM for any number of parallel DC-to-DC converters. The proposed GSSAM is validated and investigated in a time-domain simulation environment, namely a MATLAB/SIMULINK. The study compares the steady-state, transient, and oscillatory performance of the state-space average model with a fully detailed switching model.
Highlights
Due to the revolutionary development of modern electrical systems such as electric vehicles, ships, and microgrids, DC-to-DC converters are widely used in industry [1,2,3,4,5,6]
The generalized state space average model (GSSAM) of parallel DC-to-DC converters is conducted in a MATLAB/SIMULINK environment, which is compared with a detailed switching model
This paper proposes a generalized state-space averaging model of parallel DC-to-DC converters
Summary
Due to the revolutionary development of modern electrical systems such as electric vehicles, ships, and microgrids, DC-to-DC converters are widely used in industry [1,2,3,4,5,6]. The conventional concept of a state-space average model of a DC-to-DC converter is used to minimize the simulation time as well as to design the converter controllers. A generalized state space average model (GSSAM), which is the efficient method that is proposed in [15], can be developed to represent the DC-to-DC converter's transient, steady-state and switching dynamics. The method takes the converter power during a switching period cycle and expresses it in terms of a group of state and output variables to represent the state space model [13]. The contributions of this paper are as follows: The proposal of a GSSAM for n-parallel buck, boost, and buck-boost converters with a separate DC source for each converter.
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