Many modern commercial ships are electric ships, i.e., they utilize integrated propulsion (IEP ), where motors with variable speed drives used for ship propulsion. This provides a number of advantages, such as reduced size and weight, power availability aboard the ship, vibration, more flexibility in generation engine placement by eliminating mechanical connection between engines Most cruise many yachts, even cargo IEP. There is also significant interest IEP military ships.

DC distribution systems typically consist of several feedback-controlled switched-mode converters forming a complex power system. Consequently, number issues related to stability arise due interactions among multiple converter subsystems. Recent studies have presented methods such as passivity-based criterion, where the and other dynamic characteristics an interconnected system can be effectively analyzed using bus-impedance measurement. Studies online measurement techniques, bus impedance...

DC power distribution systems typically consist of several source converters supplying load through single or multiple dc buses. Such complex are prone to stability issues caused by the interactions among feedback-controlled converters. Additionally, interconnected undergo considerable changes in their operating points. This can cause a system that is well-stabilized at certain point go unstable for another condition. Therefore, stabilization method capable adapting variations conditions...

In modern dc microgrids, several feedback-controlled power electronic converters are connected to the common bus. Although control loops of each individual converter designed with good stability margins, interconnection multiple source and load can cause performance concerns, due potential interactions. Therefore, in order ensure desired dynamic interconnected system, an interesting approach is perform online monitoring bus, properly damp bus impedance, which has been demonstrated...

In this study, a novel test procedure aimed at assessing the radiated immunity of units and subsystems interconnected by wiring harnesses is proposed experimentally validated. The based on crosstalk allows inducing terminations structure under same disturbance that would be induced field-to-wire coupling, without requiring large expensive facilities. This made possible resorting to generator circuit laid parallel in proximity cable fed two RF voltage sources, whose phase shift suitably...

A power-electronics-based DC-distribution system is a complex and extensively interconnected consisting of multiple power converters. Consequently, number issues related to stability arise due interactions among converter subsystems. Recent studies have presented methods such as passivity-based criterion where the other dynamic characteristics an can be effectively analyzed using bus-impedance measurement. Studies online techniques bus impedance obtained by combining together measurements...

Interconnected AC and DC power-distribution systems are prone to interactions that can reduce system stability. Since the parameters usually vary over time with operating conditions, adaptive controllers required guarantee desired operation. Recent studies have presented methods based on online measurements of converter small-signal transfer functions. This paper proposes a computationally efficient strategy for control enables each in adjust its own local control. In paper,...

In this work a method of stability monitoring and adaptive stabilization is proposed for DC power distribution systems (PDS). It has been shown that the PDS can be effectively analyzed using system bus impedance, which calculated as parallel combination all individual impedances converters connected to bus. Conventionally, these are measured in several lengthy measurements. This work, instead, proposes online estimation impedance voltage loop-gain source converter input load converter....

Bus impedance is an important parameter for stability analysis and control design of interconnected power-electronics systems that consist multiple power converters. This paper presents online multi-input-multi-output (MIMO) measurement method to monitor the bus a medium-voltage DC (MVDC) distribution system on all-electric ship. The based Fourier techniques simultaneous injection orthogonal perturbations using existing overcomes limitations previously presented techniques, which require...

The objective of this paper is to establish a methodology evaluate the performance candidate ship concept designs in context mission scenarios. To automate design evaluation, it necessary properly set an automated way system variables that identify desired operating point. This accomplished by defining constrained static optimization problem. A cost function minimized presence constraints determine control variable values provide optimal operation for given scenario. An example analyzed...

Given the recent progress in switching power electronics converters, DC systems enabled by have become an interesting design option for many applications, due to several advantages over traditional AC systems. However, as these larger, new challenges and control areas arise. Particularly, system-level stability can be compromised interaction among feedback-controlled converters connected same bus. Positive Feed-Forward has been proposed a stabilizing controller technique multi-converter...

Bidirectional converters have become extensively applied in various dc power systems that contain battery energy storage (BESSs). Such typically consist of several feedback-controlled converters, forming a complex distribution system. Consequently, number stability issues arise due to interactions among multiple converter sub-systems. Recent studies presented adaptive control methods for guaranteeing the multi-converter system under varying operating conditions. However, most not fully...

In this work an adaptive stabilization control scheme is proposed for multi-bus DC power distribution systems. Multibus systems are generally formed by several intermediate converters that interconnect the upstream source and downstream load converters. Therefore, in such systems, stability of multiple buses concern due to interactions among tightly-regulated interconnected Based on operating conditions, either source-or load-side could be unstable or prone instability. work, each bus will...

Power distribution systems are often dependent on the operation of a large number power-electronics converters that connected to common bus. The may be standalone stable but system still exhibit stability issues due interactions among multiple converter subsystems. Recent studies have presented methods such as passivity-based criterion, where can monitored by using bus-impedance measurements. method provides dynamic performance complete does not reveal effect single dynamics. Other based...

Interconnected power-electronics converters connected to a common bus have become increasingly important in various power-distribution systems. Due interactions between converter subsystems the multi-converter system can often stability issues even though each is standalone stable. Recent studies presented passivity-based criterion with which of be analyzed by measuring impedance. The technique provides complete but does not reveal dynamics single converter. studied other methods such as...

Because of the variable nature loads and presence harmonics in a network, variation capacitor bank steps results reduction life. Previous studies calculated optimum networks with to maximize power factor. This paper calculates harmonic networks, taking into consideration effect on lifetime load harmonics. For this purpose, genetic algorithm was employed determine capacitor. The proposed method applied an actual network Province Markazi Iran. showed be flexible reliable. Copyright © 2012 John...

With the objective of evaluating electrical and thermal systems an electric ship earlier in conceptual design phase, simulation tool Smart Ship System Design (S3D) has been developed. A set-based approach is implemented, which exercised for a set missions. This paper proposes methodology to be implemented S3D add level supervisory control discipline, capable choosing best plant configuration given demands required cooling other disciplines such as mechanical systems.

In this work a stabilization control scheme is proposed for DC power distribution systems that can adapt to frequent variations in the operating conditions of system. The takes advantage novel rapid multiple-input multiple-output (MIMO) impedance measurement method allows all system impedances be measured simultaneously. This unlike conventional methods where must one at time and hence several lengthy cycles are needed. To stabilize system, an adaptive resonance-enhanced voltage controller...