Modeling and control of shipboard power systems with inverter air conditioners for frequency regulation

Liu Yu

doi:10.54097/kqxs7t56

Authors

Liu Yu

DOI:

https://doi.org/10.54097/kqxs7t56

Keywords:

Inverter air conditioner (IAC), Frequency regulation, Time delay, System stability, Demand response (DR)

Abstract

Because of the characteristics of sustainable development of renewable energy resources (RESs), the large-scale RESs are integrated into the smart grid. Nevertheless, frequency can easily fluctuate beyond the acceptable limit on account of the intermittent of RESs. In this paper, the regulation method called demand response (DR) is applying by adjusting the controllable load resources of demand side. As one of the essential loads, massive inverter air conditioners (IACs) can change their state in a short time and have little influence on user experience. Thus, it is adopted to provide frequency support in frequency regulation of shipboard microgrid (SMG) in this work. However, this also preventively introduces multiple time delays on the other hand, which result in oscillation and instability of the SMG with high probability. To handle this issue, the stability of the SMG with the participation of IACs is analysed and the delay-dependent stability criteria are further derived by employing appreciate Lyapunov-Krasovskii functional candidate, some delay-dependent techniques and linear matrix inequality method when considering single time delay and multiple time delays respectively. Then, the effect of frequency control and the comparison results of influence cause by time delay are demonstrate in different scenarios, which validates of the validity and superiority proposed method.

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