Stability Analysis of Multi-Port MVDC Distribution Networks for All-Electric Ships

Javaid, Uzair; Freijedo, Francisco D.; Merwe, Wim van der; Dujić, Dražen

doi:10.1109/jestpe.2019.2926380

Cited by 22 publications

(11 citation statements)

References 35 publications

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“…State-of-the-art research on the control design and stability analysis of DC SPS investigated the influence of design parameters on the system stability [15], and in particular finding the required capacitance and the cable length of the DC-grid as presented in [16]. Voltage stability is also studied against the negative effect of constant power loads (CPL) in [17]- [19].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Modeling, Stability Analysis, and Power Management of Shipboard DC Hybrid Power Systems

Park

Zadeh

2022

IEEE Trans. Transp. Electrific.

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This paper proposes a framework for the stability analysis and control testing of marine hybrid power systems with DC power architecture. The dynamics of such active systems are increasingly influenced by interactive modes such as the highly dynamic loads and varying load sharing scenarios, electromechanical modes, and integration of energy storage systems (ESS). Hence, a dynamic model of the entire system is developed including the power electronics and ESS, electro-mechanical systems, different controllers-low level and high level-and propulsion loads. The proposed analytical model is used to establish not only the small-signal stability analysis but also time-domain simulations. Then, a set of dynamic analyses and tests has been performed to identify the stability challenges that a vessel may be exposed to during a real operation. The suggestions for improving the system performance are given as the control modification at different levels. To emulate the real operation, a ship operational profile is used for the tests. Finally, the proposed dynamic model is verified with the experimental results conducted in a fullscale hybrid power systems laboratory. The results show that the system dynamics can be affected significantly by the interaction of the high-level and low-level control of the converters, which is usually neglected in conventional models.

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Section: Introductionmentioning

confidence: 99%

Dynamic Modeling, Stability Analysis, and Power Management of Shipboard DC Hybrid Power Systems

Park

Zadeh

2022

IEEE Trans. Transp. Electrific.

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“…This in turn also limits the bandwidth. Still, the demand for such equipment is growing due to the need to support the development of recent medium voltage dc (MVdc) and medium voltage ac (MVac) applications, grid integration of renewable energy sources and storage devices, energy transmission and distribution in the MV range [11]- [13] and assure safe integration with the existing apparatus.…”

Section: Introductionmentioning

confidence: 99%

Hardware-in-the-Loop Characterization of Source-Affected Output Characteristics of Cascaded H-Bridge Converter

Petković

Dujić

2021

IEEE J. Emerg. Sel. Topics Power Electron.

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Recent trends in power system design such as an increasing share of renewable energy sources and integration of power electronics equipment for medium voltage applications are creating different subsystem interactions that require proper investigation, understanding, description, and estimation of global system stability through impedance-admittance measurements and identification. Four-quadrant Cascaded H-Bridge topology features high output voltage resolution and high effective switching frequency which enables high-dynamic, high-fidelity voltage perturbation injection for medium voltage impedance measurement. This paper assesses the impact that the active element on the input side has on the output side, where the injection of the perturbation signal is realized. Models of the input and output element are developed as well as the model of the connected system. To validate the theoretical developments, a new method to measure the single-phase output dynamics in the dq-frame is proposed and the measurement is performed using offline and real-time simulations on a hardware-in-the-loop platform.

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“…Another case in which the CPL hypothesis is conveniently assumed is in [26], where the researchers put the focus on the method for designing a fault-tolerant stabilizing system. CPL is also adopted for marine applications [27,28], while [29] considers a limitation in CPL bandwidth. Other ideas to overcome the ideal CPL are in [30,31], where reduced-order models are defined.…”

Section: Introductionmentioning

confidence: 99%

Weighted Bandwidth Method for Stability Assessment of Complex DC Power Systems on Ships

et al. 2021

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In shipboard DC grids, tightly controlled load converters can impair the system stability, thus provoking the ship blackout. Conversely, load converters regulated by low control bandwidths are capable of inducing a stabilizing action. This compensation is verifiable if the loads are few. On the contrary, the balancing of control dynamics is hardly evaluated if the bus feeds multiple (i.e., hundreds or more) DC controlled loads. In this paper, the weighted bandwidth method (WBM) is presented to assess the small-signal stability of a complex shipboard power system by aggregating the multiple converters into two sets of controlled loads. Once the validity of the aggregation is proven, a stability study is performed on the two-loads system. As the last system is more inclined to instability than the initial multiple-loads system, the verification of the two-loads stability criterion guarantees that the shipboard DC grid also remains stable. Finally, emulations on HIL verify the proposed stability assessment thus providing the first unique verification of WBM.

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Stability Analysis of Multi-Port MVDC Distribution Networks for All-Electric Ships

Cited by 22 publications

References 35 publications

Dynamic Modeling, Stability Analysis, and Power Management of Shipboard DC Hybrid Power Systems

Dynamic Modeling, Stability Analysis, and Power Management of Shipboard DC Hybrid Power Systems

Hardware-in-the-Loop Characterization of Source-Affected Output Characteristics of Cascaded H-Bridge Converter

Weighted Bandwidth Method for Stability Assessment of Complex DC Power Systems on Ships

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