Stability of Shipboard DC Power Distribution: Online Impedance-Based Systems Methods

Riccobono, Antonino; Cupelli, Marco; Monti, Antonello; Santi, Enrico; Roinila, Tomi; Abdollahi, Hessamaldin; Arrúa, Silvia; Dougal, Roger A.

doi:10.1109/mele.2017.2718858

Cited by 87 publications

(52 citation statements)

References 10 publications

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“…Therefore, their cut-off frequency should be chosen significantly lower than the expected crossover frequency of the loop under investigation. Different attenuation levels, obtained by changing the cut-off frequency or the order of the filter, resultf As can be noticed, the choice of f lpf does not affect the average values of the obtained estimates, but it affects the superimposed sinusoidal fluctuation at 2f , as highlighted also in (8) and (9). Fig.…”

Section: B Mt Applied To the Droop Loopmentioning

confidence: 81%

“…A significant example of the latter case can be found in shipboard dc power distribution systems, where the behavior seen by a converter from its load and source sides can tremendously change along the course of a mission; this rises stability concerns about the interactions among the subsystems. In this context, continuous, online estimates of the stability-margins can be effectively exploited to tune the converters controllers, thus ensuring a reliable operation [9].…”

Section: Introductionmentioning

confidence: 99%

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Analysis of an Online Stability Monitoring Approach for DC Microgrid Power Converters

Khodamoradi

Liu

Mattavelli

et al. 2019

IEEE Trans. Power Electron.

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An on-line approach to evaluate and monitor the stability margins of dc microgrid power converters is presented in this paper. The discussed online stability monitoring technique (MT) is based on the Middlebrook's loop-gain measurement technique, adapted to the digitally controlled power converters. In this approach, a perturbation is injected into a specific digital control loop of the converter and after measuring the loop gain, its crossover frequency and phase margin are continuously evaluated and monitored. The complete analytical derivation of the model, as well as detailed design aspects, are reported. In addition, the presence of multiple power converters connected to the same dc bus, all having the stability monitoring unit, is also investigated. An experimental microgrid prototype is implemented and considered to validate the theoretical analysis and simulation results, and to evaluate the effectiveness of the digital implementation of the technique for different control loops. The obtained results confirm the expected performance of the stability monitoring tool in steady-state and transient operating conditions. The proposed method can be extended to generic control loops in power converters operating in dc microgrids.

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Section: B Mt Applied To the Droop Loopmentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

Analysis of an Online Stability Monitoring Approach for DC Microgrid Power Converters

Khodamoradi

Liu

Mattavelli

et al. 2019

IEEE Trans. Power Electron.

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show abstract

“…Many physical nonlinear systems in general satisfy the Euler-Lagrange (EL) conditions and therefore can be represented in the PCH framework [13]. The PCH model of a non-linear system is given by equation (1). It results from the network modelling of a physical system containing lumpedparameters with independent energy storage elements [10] [12].…”

Section: A Port-controlled Hamiltonian (Pch) Systemsmentioning

confidence: 99%

“…Here, the vector ( , ) captures two types of interconnection, namely the standard interconnection and the "constant source inputs" [10]. For a buck converter however, the control variable is separable from the interconnection structure, leading to the PCH model given in (1). The advantage of a Type (1) PCH system is the derivability of the control law from the matching equation in a straightforward manner.…”

Section: A Port-controlled Hamiltonian (Pch) Systemsmentioning

confidence: 99%

A Structure Preserving Approach for Control of Future Distribution Grids and Microgrids Guaranteeing Large Signal Stability

Cupelli

Bhanderi

Gurumurthy

et al. 2018

2018 IEEE Conference on Control Technology and Applications (CCTA)

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This paper describes the application of the Port Controlled Hamiltonian Network for Modelling and Control of non-linear power system dynamics. Goal of this work is to propose a methodology for system level design for power electronics driven electrical networks able to guarantee large signal stability. Starting from a model-level modular approach, the system is defined using the interconnection concept. The paper focuses on a DC micro-grid scenario where several converters interact with a lumped load. Contrary to previous work, the load is modelled as a Constant Power Load (CPL) introducing new challenges in terms of system stability.

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“…The ongoing interactions between PEIs and RESs introduce new barriers related to stability and control issues [2][3][4]. For the stability analysis of any system, which is a preliminary assessment of its reliable operation, small-and large-signal analyses are widely used.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Grid-Connected Photovoltaic Systems with Dynamic Phasor Model

2019

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The typical layout of power systems is experiencing significant change, due to the high penetration of renewable energy sources (RESs). The ongoing evaluation of power systems is expecting more detailed and accurate mathematical modeling approaches for RESs which are dominated by power electronics. Although modeling techniques based on state–space averaging (SSA) have traditionally been used to mathematically represent the dynamics of power systems, the performance of such a model-based system degrades under high switching frequency. The multi-frequency averaging (MFA)-based higher-index dynamic phasor modeling tool is proposed in this paper, which is entirely new and can provide better estimations of dynamics. Dynamic stability analysis is presented in this paper for the MFA-based higher-index dynamical model of single-stage single-phase (SSSP) grid-connected photovoltaic (PV) systems under different switching frequencies.

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Stability of Shipboard DC Power Distribution: Online Impedance-Based Systems Methods

Cited by 87 publications

References 10 publications

Analysis of an Online Stability Monitoring Approach for DC Microgrid Power Converters

Analysis of an Online Stability Monitoring Approach for DC Microgrid Power Converters

A Structure Preserving Approach for Control of Future Distribution Grids and Microgrids Guaranteeing Large Signal Stability

Stability Analysis of Grid-Connected Photovoltaic Systems with Dynamic Phasor Model

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