Stability analysis of parallel DC-DC converters controlled over communication network Online publication date: Thu, 28-Oct-2021
by Ashraf Khalil; Ang Swee Peng; Ali Asheibi
International Journal of Power Electronics (IJPELEC), Vol. 14, No. 4, 2021
Abstract: In this paper, we propose a method for computing the delay margin of parallel DC-DC converters controlled over communication network. The parallel converters implement master-slave control strategy where the control signals are exchanged over communication network. The system is modelled as a general time delay system and the delay margin required for system stability is computed. The transcendental characteristics equation is transformed to frequency dependent equation. The spectral radius is used to find the frequencies at which the roots cross the imaginary axis. The crossing frequencies are determined through the sweeping test and the binary iteration algorithm. The impact of the system and the controller parameters on the maximum delay margin is studied. It is found that the capacitance, the load resistance and the input voltage have strong effects on the delay margin, while for the controller parameters, the delay margin decreases with increasing the master voltage controller gain.
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