Impedance-based stability analysis and design considerations for DC current distribution with long transmission cable

Reconfigurable Power Converter for Constant Current Underwater Observatory

“…However, parasitic parameters under long submarine cables are not considered. Wang, Saha, and Zane [25] analyze the stability of an SRC with CC output being regulated in considering the cable effect, but only discuss the influence of small current fluctuation on the steady-state, whereas heavy For underwater power systems, the extra cost of the wasted electricity is often very low compared with either the cost of manufacturing, deployment, or maintenance of the whole system. For CC underwater power systems with long cables, compared with sacrificing the stability of CC/CV conversion to put the whole system in danger, sacrificing efficiency to gain higher stability is often cost effective.…”

“…However, parasitic parameters under long submarine cables are not considered. Wang, Saha, and Zane [25] analyze the stability of an SRC with CC output being regulated in considering the cable effect, but only discuss the influence of small current fluctuation on the steady-state, whereas heavy load changes are not considered. Due to the presence of parasitic parameters such as the capacitance Electronics 2020, 9,307 3 of 18 and inductance on long cables [25][26][27], the dynamic response of a long-cable CC system is relatively slow and the mentioned CC/CV methods may face challenges such as voltage oscillation or instability especially when heavy load change occurs [19].…”

“…Electronics 2020, 9,307 3 of 18 load changes are not considered. Due to the presence of parasitic parameters such as the capacitance and inductance on long cables [25][26][27], the dynamic response of a long-cable CC system is relatively slow and the mentioned CC/CV methods may face challenges such as voltage oscillation or instability especially when heavy load change occurs [19]. The relatively low stability leads to relatively low reliability.…”

Reduced-Order Modelling Method of Grid-Connected Inverter with Long Transmission Cable

“…In detail, the cascaded-Π circuit models of LTC are built in [6]- [13]. However, practical frequencydependent characteristics of LTC is not revealed in [6], [8]- [11], which fails to perform effective stability analysis due to the lack of corresponding damping characteristics. To reveal practical frequency characteristics and corresponding damping characteristics of LTC, an improved cascaded-Π circuit model is developed in [12], [13], where a series of extra RL branches are paralleled with each Π section of conventional cascaded-Π circuit.…”

Impedance-Based Modelling Method for Length-Scalable Long Transmission Cable for Stability Analysis of Grid-Connected Inverter

“…Then, Norton equivalent circuit can be established on the basis of derived impedance formula [5]. As for the LTC, most existing works modelled the LTC as cascaded Π circuit instead of modelling it as Norton/ Thevenin equivalent circuit [3], [12], [13]. A decoupled two-port circuit model of LTC is proposed to represent terminal characteristics of power cable, where a voltage controlled voltage source and a current controlled current source are placed at sending end and receiving end, respectively [6].…”