Voltage regulation in medium voltage DC systems

Barati, Farhad; Li, Dan; Dougal, Roger A.

doi:10.1109/ests.2013.6523763

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…Moreover, the bi-directional buck converter gives us the opportunity to have a high-performance DC bus voltage control. The idea of this work was first presented in [23] for an Electric Ship Medium-Voltage DC (MVDC) distribution system. It was proven using the numerical modeling and simulations in PSCAD/EMTDC software environment.…”

Section: Introductionmentioning

confidence: 99%

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A Hierarchical Control of Supercapacitor and Microsources in Islanded DC Microgrids

Barati

Ahmadi²,

Keysan

2023

IEEE Access

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This paper proposes a hierarchical control approach for SuperCapacitor (SC) energy storage and microsources in islanded DC microgrids. It takes into account microsources' dynamic and steadystate limitations. The proposed approach relies on an architecture presented for the SC's and microsources' interfaces with the DC bus. In the proposed architecture, DC microsources interface with the DC bus through buck converters. Moreover, the SC interfaces with the DC bus through the bi-directional buck converter. The instantaneous loads currents are measured and employed in the secondary control to calculate the reference currents for buck converters. In the primary control, we run buck converters as current sources. Moreover, the bi-directional buck converter is run to regulate the DC bus voltage. The proposed approach is generic; meaning that it can be employed for any islanded DC microgrid. Without loss of generality, to prove its effectiveness, we utilized it for a Low Voltage DC (LVDC) microgrid in this paper. Analysis, design, simulations, and experimental verifications are presented for the LVDC microgrid. The experimental results confirm that, by employing the proposed approach, the DC bus voltage deviations from its reference voltage is 5% and it restores in less than 1 sec.INDEX TERMS Islanded DC microgrids, hierarchical control, SC energy storage, microsources' dynamic and steady-state limitations.

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Section: Introductionmentioning

confidence: 99%

“…It was proven using the numerical modeling and simulations in PSCAD/EMTDC software environment. The current paper is a generalized and comprehensively extended one compared to our previous work in [23] in terms of the followings.…”

Section: Introductionmentioning

confidence: 99%

A Hierarchical Control of Supercapacitor and Microsources in Islanded DC Microgrids

Barati

Ahmadi²,

Keysan

2023

IEEE Access

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“…A new trend in energy management of low voltage micro grids, is to use UC modules and associated bi-directional converters, to regulate bus voltage [5], [6]. A simplified configuration of this strategy in a DC micro grid, is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

A Variable Current-Limit Control Scheme for a Bi-directional Converter used in Ultracapacitor Applications

Ahmadi

Barati

Karimi

2018

Electric Power Components and Systems

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In ultracapacitor applications, generally, a bi-directional converter is connected to a DC bus and is designed to compensate rapid load variations on the bus. During transient phases, overloaded DC bus can push the converter out of its operating limits. For providing the necessary power, converters should be put in parallel, while each converter is limited into its optimal operating range. In a boost converter this operating limit can be related to the inductor current and UC voltage. In this study, a variable current-limit is proposed for inductor current which then determines the operating range of the boost converter. This method will provide stability of the converter during overload transients. An experimental setup consisting of a bi-directional converter, a controllable load/source and an ultracapacitor is presented, to validate the proposed method. Several scenarii are applied to analyse the performance of the system in overloaded phases and theoretical and experimental results are presented. Manuscript received in final form on xx, xxx.

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“…For the current Medium-Voltage Direct Current (MVDC) shipboard power system design, voltage control and regulation both under prefault and post-fault outage conditions have been considered as one of the most critical design factors for improving security, reliability and survivability [1]. The desirable performance evaluation metrics have been specifically mentioned in by ESRDC as the standard for voltage-regulation related system studies in both steady-state and transient conditions [2]. This set of dynamic operating performance criteria shown in Table I is adopted in this paper.…”

Section: Introductionmentioning

confidence: 99%

Development of a control-based performance management system for shipboard power systems

Shi

Abdelwahed

Zhu

et al. 2015

2015 IEEE Electric Ship Technologies Symposium (ESTS)

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This paper presents a coordinated and automated approach to determine the system adjustment strategy for Shipboard Power Systems (SPS) to improve the transient performance and prevent potential voltage instability following a system contingency. In contrast with the conventional design schemes that heavily rely on the human operators and pre-specified rules/set points, this paper focuses on the development of the capability to automatically and efficiently detect and react to system state changes caused by disturbances and damages by incooperating different system components and component-level controllers to formulate an overall system-level solution. To achieve this objective, in this paper we proposed a performanceoriented, model-based predictive framework that can be applied to a variety of SPS applications to meet the stringent performance requirements under different operating conditions. Simulation results have proven the capability of the proposed framework to effectively and efficiently improve the dynamic system performance during the transient period with little or none human interventions.

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Voltage regulation in medium voltage DC systems

Cited by 10 publications

References 9 publications

A Hierarchical Control of Supercapacitor and Microsources in Islanded DC Microgrids

A Hierarchical Control of Supercapacitor and Microsources in Islanded DC Microgrids

A Variable Current-Limit Control Scheme for a Bi-directional Converter used in Ultracapacitor Applications

Development of a control-based performance management system for shipboard power systems

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