Читать книгу Power Electronics-Enabled Autonomous Power Systems - Qing-Chang Zhong - Страница 44

The kinetic balancing inertia of a conventional synchronous machine does not vary. However, the virtual inertia of a VSM is reconfigurable. This provides more flexibility for the PFR. Moreover, the virtual inertia of a VSM does not involve estimation of system frequency or the rate of change of frequency (RoCoF). This is very different from the synthetic inertia that changes the power according to the measured frequency and its rate of change, which causes noise amplification due to the measurement of (Duckwitz and Fischer 2017; Zhu et al. 2013). Another important factor related to system instability is damping. The damping of a VSM can be reconfigured to improve stability as well. See Chapter 14 for details about reconfiguration of virtual inertia and virtual damping.