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In science and engineering, many concepts are introduced without a clear physical meaning, e.g., imaginary numbers in mathematics and reactive power in electrical engineering. In this paper, a new operator, coined the ghost operator $g$ , is introduced to physically construct the ghost of a system. It satisfies $g^{2}=-1$ but is different from the imaginary operator. With the help of the port-Hamiltonian...
Cascaded Buck conversion system is a typical structure in dc distributed power system (DPS). It is known that, the interaction between its individually designed power modules/subsystems may cause the instability problem of the whole system. The traditional solution is to design this system by Middlebrook criterion. However, authors found that, even if the entire system meets Middlebrook criterion,...
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