Small-signal modeling, integration, and hardware implementation for optimized DC distribution system based on hierarchical control master–slave structure

Lee, Seung-Woon; Kim, Jong-Hoon

doi:10.1016/j.epsr.2019.105998

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…The instantaneous input power of the converter is constant under the action of closed-loop control, so the power electronic converter is called constant power load (CPL) [7], [8]. However, CPL exhibits negative impedance characteristics, which reduces the damping and degrades the stability margin [9], [10]. Several solutions have been proposed to mitigate the issue.…”

Section: Introductionmentioning

confidence: 99%

Phase Shaping Method for Negative Input Admittance of Buck Converter Based on Sliding Mode Disturbance Observer

et al. 2021

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The power electronic converter that supplies power to the unmanned ship's servers can cause self-excited oscillation of the LC input filter under heavy load. To suppress voltage oscillation, an input impedance shaping method based on a sliding mode disturbance observer is presented. The self-excited oscillation mechanism of the LC filter caused by the buck converter's positive feedback is analyzed by using the small-signal model. The sliding mode disturbance observer calculates the input voltage according to the output voltage, inductance current and duty cycle of the buck converter. The feedforward compensation of the observed voltage reshapes the input admittance of the buck converter, making the system not meet the conditions of self-excited oscillation and suppressing the voltage oscillation of the LC filter. The phase shaping of input admittance is compared with the traditional amplitude shaping by the Bode diagram and Nyquist diagram. The experimental results show that the phase shaping method could better suppress the LC filter's self-excited oscillation and the sliding mode disturbance observer reduced the hardware cost.

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