Stability analysis model for multi-node undersea observation networks

Cabled undersea observation networks have been attracting increasing research attention due to the abilities of abundant power distribution and broad bandwidth communication. Stability of their power supply systems is crucial for their normal operation. However, rare studies were carried out on stability analysis of such multi-node undersea power supply systems. This paper focuses on analyzing the steady-state characteristics of multi-node tree topology power supply system for regional coastal ocean observation network. Firstly, the equivalent model of power delivery submarine cable is introduced, as well as the cable parameters calculating method. Then, based on features of the power network, simplified model of constant power load (CPL) and voltage algorithm of multi-node tree topology network are proposed and built respectively, to obtain each node voltage of a given network. The algorithm was carried out on MATLAB, and simulation model of the observatory network was set in Pspice based on CPL theory. Full-response time-domain method was proposed to analyze the dynamic process at scenarios of startup and load step change. Simulations and experiments were carried out, from which results showed good consistence, verifying the theoretical methods.