Series Loss-Free Resistor: Analysis, Realization and Applications
An analysis of the transient behavior of DC
networks consisting of voltage sources, capacitors, and series loss-free
resistors (SLFRs) is presented. The realization of an SLFR was achieved by
means of a topological variation of the positive output-voltage buck-boost
converter operated in discontinuous-conduction mode (DCM). It is demonstrated
that even simple RC circuits containing SLFRs exhibit behavior that is
described by Abel nonlinear differential equations, which do not have an exact
analytical solution. Some possible applications of the SLFRs in power
electronics, DC microgrids and renewable energy power systems, include
loss-free charge and discharge of capacitor banks, voltage equalization of
capacitors, and loss-free voltage clamping circuits. The concept of the SLFR
can also be applied for voltage control in DC microgrids, employing the droop
voltage technique, equalization of power and current in voltage sources
associated in parallel (including batteries and DC-DC converters), and also
input and output voltage natural balance in input-series output-series (ISOS)
association of DC converters. The theoretical analysis results are validated
via numerical examples and computer simulation.
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