Design of an Input-Parallel Output-Parallel Multi-Module DC-DC Converter Using a Ring Communication Structure

Hu, Tao; Khan, Muhammad Mansoor; Xu, Kai‐Da; L, Zhou; Rana, Ahmad

doi:10.6113/jpe.2015.15.4.886

Cited by 10 publications

(6 citation statements)

References 22 publications

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“…The impact of communication delay on secondary frequency control was discussed in [29], and a gain scheduling method was suggested to compensate for the communication delay. In [30], a ring communication structure with communication delay was discussed, while consensus network problems were discussed with or without communication delay in [31]. To the best of the authors' knowledge, not much research has been conducted to investigate the impact of communication delay on the system control performance to ensure a good bandwidth.…”

Section: Motivationmentioning

confidence: 99%

“…Operational delays are usually smaller compared to communication delays and have a minor influence on system stability [34]. Moreover, the sampling frequency is very fast in all nodes, which may be neglected in this network [30]. Therefore, the communication delay impact is kept in focus to ensure a good voltage control bandwidth of the system.…”

Section: Communication Delay Impact On System Performancementioning

confidence: 99%

“…In the local node of each converter, the average DC bus voltages are estimated for the cooperative control. The estimated communication delay for an individual node to take the average value of voltage is (N − 1)T d [30], where N represents the total number of previous crossing nodes.…”

Section: Communication Delay Impact On System Performancementioning

confidence: 99%

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Structural Improvements in Consensus-Based Cooperative Control of DC Microgrids

Mumtaz¹,

Khan²,

Fang³

et al. 2019

Electronics

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This study is dedicated to establishing a comparative analysis of the performance ofdifferent local controllers on the cooperative control of DC microgrids. One of the elementary andchallenging issues in DC microgrids is the assurance of fairness in proportional current sharingwhile accomplishing voltage regulation in parallelly connected distributed energy sources. In thiswork, structural improvements are proposed to enhance the system stability and controlperformance. A finite-gain controller was employed in the outer voltage control loop with a simpleproportional (P) controller in the inner current control loop of a converter. Due to the finite-gaincontroller, droop-like power sharing was achieved without droop coefficient. In order to furtherenhance the power-sharing accuracy and DC voltage regulation, a different method was adopted inconsensus-based cooperative control to estimate the average current and average voltage difference.Moreover, small signal analysis was used to scrutinize the stability and control performance of thelocal controller, while different communication delays and current disturbances were applied toexamine the performance of the controller. Finally, a four-node-based DC microgrid setup wasdeveloped in MATLAB/Simulink environment, and simulation results of the proposed and existingtechniques were scrutinized. The simulations results demonstrated the effectiveness of the proposedcontroller.

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Section: Motivationmentioning

confidence: 99%

Section: Communication Delay Impact On System Performancementioning

confidence: 99%

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Structural Improvements in Consensus-Based Cooperative Control of DC Microgrids

Mumtaz¹,

Khan²,

Fang³

et al. 2019

Electronics

Self Cite

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“…The problem is formulated as a single objective optimization problem, which is finally solved by a genetic algorithm There are two main challenges that need to be tackled in a modular DC/DC conversion system. The first issue concerns the voltage stability and current balance problems of each module that arise because of the presence of differences in the various module parameters in real applications [13]. To guarantee the correct operation of parallel-parallel DC/DC conversion systems, the balance between the modules must be ensured, i.e., voltage stability and proper sharing of the output current among the converters parallel connected at the output side.…”

Section: Introductionmentioning

confidence: 99%

Optimal Size of a Smart Ultra-Fast Charging Station

2021

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An ever-increasing penetration of electric vehicles (EVs) on the roads inevitably leads to an ever-stringent need for an adequate charging infrastructure. The emerging ultra-fast charging (UFC) technology has the potential to provide a refueling experience similar to that of gasoline vehicles; hence, it has a key role in enabling the adoption of EVs for medium-long distance travels. From the perspective of the UFC station, the differences existing in the EVs currently on the market make the sizing problem more challenging. A suitably conceived charging strategy can help to address these concerns. In this paper, we present a smart charging station concept that, through a modular DC/DC stage design, allows the split of the output power among the different charging ports. We model the issue of finding the optimal charging station as a single-objective optimization problem, where the goal is to find the number of modular shared DC/DC converters, and where the power rate of each module ensures the minimum charging time and charging cost. Simulation results show that the proposed solution could significantly reduce the required installed power. In particular, they prove that with an installed power of 800 kW it is possible to satisfy the needs of a UFC station composed of 10 charging spots.

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“…Secondary controls form the outer loop on top of the primary control. At the secondary level, all the nodes share the values with their neighbors to observe and converge the system to one common set point for the system to remain stable and balanced [14][15][16]. Secondary and tertiary controls are implemented in a centralized or decentralized fashion where they communicate with their neighbors through communication links.…”

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confidence: 99%

A Hierarchical Control Methodology for Renewable DC Microgrids Supporting a Variable Communication Network Health

Shahid

Khan

et al. 2018

Electronics

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The monitoring and control of renewable energy sources (RESs) based on DC (Direct Current) microgrids (DC MG) are gaining much consideration at this time. In comparison with the isolated individual control of converters in a microgrid, DC microgrids provide better voltage regulation and harmonized energy generation/consumption. To address the inherent vulnerability of communication links, robust methods have been proposed that improve the resilience of communication-based control. However, the failure of the communication links in microgrid control layers remains a considerable issue that may lead to one or more nodes being disconnected and operating as a communication island. Such types of communication islanding may cause the unpredictable behavior of the system and further destabilization may lead to a cascaded failure. This paper proposes a fast algorithm to detect and evaluate network connectivity based on the information stored at every node in the form of a look-up table. The control structure has been modified under communication islanding, and a communication connectivity observer is used at every node to detect and address power flow issues under communication islanding. The proposed method has been verified through mathematical analysis, simulation, and experimental results.

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Design of an Input-Parallel Output-Parallel Multi-Module DC-DC Converter Using a Ring Communication Structure

Cited by 10 publications

References 22 publications

Structural Improvements in Consensus-Based Cooperative Control of DC Microgrids

Structural Improvements in Consensus-Based Cooperative Control of DC Microgrids

Optimal Size of a Smart Ultra-Fast Charging Station

A Hierarchical Control Methodology for Renewable DC Microgrids Supporting a Variable Communication Network Health

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