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Current controlled operation of cascaded H-bridge converter for fast SoC balancing in grid energy storage

2019 IEEE Energy Conversion Congress and Exposition, ECCE 2019

Hussain, Amir; Raj, Krishna; Rajashekara, Kaushik; Krishnamoorthy, Harish; Atcitty, Stanley A.

In grid energy storage systems based on batteries, the interface converter topology plays a significant role in the optimized operation of the system. Among different types of multi-level converters, cascaded H-bridge converter (CHBC) provides the advantage of utilizing isolated battery pack (BP) with a lower number of series-connected cells and can perform state of charge (SoC) balancing by controlling the power flow to/from each BP. However, the rate of SoC balancing is limited due to low balancing current when the amount of power exchange is low. This paper proposes a new power control method using hybrid modulation strategy with extended operating region (HMSEOR) which enables the CHBC to perform fast SoC balancing at constant current irrespective of the amount of power exchange between the battery system and the grid. The HMSEOR allows power flow from a BP with a higher SoC to a BP with a lower SoC without compromising power exchange with the grid. The performance of the proposed SoC balancing method is validated through real-time hardware-in-the-loop (HIL) simulation and compared with the conventional SoC balancing at unity power factor operation.

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TYPE Conference Poster YEAR 2019
ScopusOSTIDOI

A Voltage Droop-Based State of Charge Control among Split Batteries in Modular Multilevel Converter for Grid Energy Storage Interface

2019 IEEE Industry Applications Society Annual Meeting, IAS 2019

Hussain, Amir; Raj, Krishna; Rajashekara, Kaushik; Krishnamoorthy, Harish; Atcitty, Stanley A.

In grid energy storage systems based on batteries, the interface converter topology plays a significant role in the optimized operation of the system. Among the different types of transformer-less high-power converters, the split battery type modular multilevel converter (SBMMC) has become a promising technology for interfacing the storage system with a medium voltage grid which can also perform battery management. This paper proposes a droop-based control for state of charge (SoC) balancing among the battery packs in SBMMC for a grid-connected battery energy storage system (BESS). First, steady-state analysis of the SBMMC is performed which forms the basis for SoC balancing scheme. Consequently, the droop-based control is applied to balance SoCs among the arms and submodules (SM) by controlling the reference voltages. For SoC balancing among the three phases of the upper and lower arms, appropriate zero sequence voltage (ZSV) is injected to the respective reference voltages of each arm. The proposed SoC balancing method has been validated through simulation results.

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TYPE Conference Poster YEAR 2019
ScopusOSTI

Distributed TABC based bi-directional converter for cell/sub-modular level battery energy storage system

2019 IEEE Texas Power and Energy Conference, TPEC 2019

Pragallapati, Nataraj; Ranade, Satish J.; Mueller, Jacob M.; Atcitty, Stanley A.

In this paper, Triple Active Bridge Converter (TABC) based Cell Level/Sub-Modular level power processing Battery Energy Storage System (BESS) is proposed to provide better efficiency, reliability and safety benefits. One TABC is connected to the two cells/two sub-modules of the battery pack, and all outputs of the TABC's are connected in series or parallel to achieve the required voltage or current. The main features of the proposed configuration are: to avoid the unnecessary charging/discharging phenomena, providing the isolation, and to improve the optimal power flow of each cell of the battery. Also, secondary voltage compensation and droop based decentralized control scheme is proposed to improve the power-sharing of each TABC and voltage regulation at the battery output under the effect of cable resistance considered. The proposed configuration and control strategy is validated under different loading conditions by MATLAB®, SIMULINK®.

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TYPE Conference Poster YEAR 2019
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Enabling Advanced Power Electronics Technologies for the Next Generation Electric Utility Grid (Workshop Summary Report)

Atcitty, Stanley A.; Mueller, Jacob M.; Chalamala, Babu C.; Sokoloff, David S.

The role of power electronics in the utility grid is continually expanding. As converter design processes mature and new advanced materials become available, the pace of industry adoption is poised to accelerate. Looking forward, we can envision a future in which power electronics are as integral to grid functionality as the transformer is today. The Enabling Advanced Power Electronics Technologies for the Next Generation Electric Utility Grid Workshop was organized by Sandia National Laboratories and held in Albuquerque, New Mexico, July 17 - 18, 2018 . The workshop helped attendees to gain a broader understanding of power electronics R&D needs—from materials to systems—for the next generation electric utility grid. This report summarizes discussions and presentations from the workshop and identifies opportunities for future efforts.

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TYPE SAND Report YEAR 2018
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Tribal Colleges and Universitie/American Indian Higher Education Consortium Advanced Manufacturing Technical Assistance Project

Atcitty, Stanley A.

The National Nuclear Security Agency (NNSA) created a Minority Serving Institution Partnership Plan (MSIPP) to 1) align investments in a university capacity and workforce development with the NNSA mission to develop the needed skills and talent for NNSA’s enduring technical workforce at the laboratories and production plants and 2) to enhance research and education at under-represented colleges and universities. Out of this effort, MSIPP launched a new program in early FY17 focused on Tribal Colleges and Universities (TCUs). The following report summarizes the project focus and status update during this reporting period.

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TYPE Other Report YEAR 2018
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Electrical components for marine renewable energy arrays: A techno-economic review

Energies

Collin, Adam J.; Nambiar, Anup J.; Bould, David; Whitby, Ben; Moonem, M A.; Schenkman, Benjamin L.; Atcitty, Stanley A.; Chainho, Paulo; Kiprakis, Aristides E.

This paper presents a review of the main electrical components that are expected to be present in marine renewable energy arrays. The review is put in context by appraising the current needs of the industry and identifying the key components required in both device and array-scale developments. For each component, electrical, mechanical and cost considerations are discussed; with quantitative data collected during the review made freely available for use by the community via an open access online repository. This data collection updates previous research and addresses gaps specific to emerging offshore technologies, such as marine and floating wind, and provides a comprehensive resource for the techno-economic assessment of offshore energy arrays.

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TYPE Journal Article YEAR 2017
ScopusOSTIDOI
Results 51–100 of 280
Results 51–100 of 280