An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance

Wang, Panbao; Liu, Xiaonan; Yang, Xu; Wang, Wei; Xu, Dianguo

doi:10.1109/tpel.2015.2499310

Cited by 312 publications

(168 citation statements)

References 34 publications

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“…Equation (29) shows that deviation of output voltage results from the current difference going through a low pass filter G d (S) and dc gain K DC . The longer decay time constant t is, the more accurate current sharing can be achieved, but on the other hand, the larger voltage deviation happens.…”

Section: Analysis Of the Proposed Current Sharing Control Systemmentioning

confidence: 99%

“…The longer decay time constant t is, the more accurate current sharing can be achieved, but on the other hand, the larger voltage deviation happens. To guarantee that the voltage deviation does not exceed its maximum acceptable value, the value of the decay time constant should be limited according to (19), (20) and (29).…”

Section: Analysis Of the Proposed Current Sharing Control Systemmentioning

confidence: 99%

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Decentralised control method for DC microgrids with improved current sharing accuracy

Yang

Jin

et al. 2017

IET Generation, Transmission & Distribution

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A decentralised control method that deals with current sharing issues in dc microgrids (MGs) is proposed in this study. The proposed method is formulated in terms of 'modified global indicator' concept, which was originally proposed to improve reactive power sharing in ac MGs. In this work, the 'modified global indicator' concept is extended to coordinate dc MGs, which aims to preserve the main features offered by decentralised control methods such as no need of communication links, central controller or knowledge of the microgrid topology and parameters. This global indicator is inserted between current and voltage variables by adopting a virtual capacitor, which directly produces an output current sharing performance that is less relied on mismatches of the multi-bus network. Meanwhile, a voltage stabiliser is complementary developed to maintain output voltage magnitude at steady state through a shunt virtual resistance. The operation under multiple dc-buses is also included in order to enhance the applicability of the proposed controller. A detailed mathematical model including the effect of network mismatches is derived for analysis of the stability of the proposed controller. The feasibility and effectiveness of the proposed control strategy are validated by simulation and experimental results.

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Section: Analysis Of the Proposed Current Sharing Control Systemmentioning

confidence: 99%

Section: Analysis Of the Proposed Current Sharing Control Systemmentioning

confidence: 99%

Decentralised control method for DC microgrids with improved current sharing accuracy

Yang

Jin

et al. 2017

IET Generation, Transmission & Distribution

View full text Add to dashboard Cite

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“…The effect of the communication delay Td on previous communication channel based secondary control methods are discussed in [16]- [18]. In this subsection, the impact of the communication delay on the stability is analyzed using eigenvalue analysis.…”

Section: Effect Of Communication Delaymentioning

confidence: 99%

An Enhanced Secondary Control Approach for Voltage Restoration in the DC Distribution System

Gao¹,

Bozhko²,

Wheeler³

2016

SAE Technical Paper Series

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The paper will deal with the problem of establishing a desirable power sharing in multi-feed electric power system for future moreelectric aircraft (MEA) platforms. The MEA is one of the major trends in modern aerospace engineering aiming for reduction of the overall aircraft weight, operation cost and environmental impact. Electrical systems are employed to replace existing hydraulic, pneumatic and mechanical loads. Hence the onboard installed electrical power increases significantly and this results in challenges in the design of electrical power systems (EPS). One of the key paradigms for future MEA EPS architectures assumes high-voltage dc distribution with multiple sources, possibly of different physical nature, feeding the same bus(es). In our study we investigate control approaches to guarantee that the total electric load is shared between the sources in a desirable manner. A novel communication channel based secondary control method is proposed in this paper. Stability of the proposed method is investigated and it proves that the system stability margin is upgraded using the compensation method. The analytical results of the study will be supported by both time-domain simulations and experimental results.

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“…Thus, even a small difference in the output voltage between the paralleled sources will cause the one that is a few mV higher to hog all the current. The lower the output voltage of the module is, the more severe this problem is [10].…”

Section: Introductionmentioning

confidence: 99%

“…To address the aforementioned challenges, different control schemes for DC microgrids are reported in [7,[10][11][12][13][14][15][16]. Commonly, these control schemes can be categorized as centralized and decentralized control [10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Proportional Load Sharing and Stability of DC Microgrid with Distributed Architecture Using SM Controller

Rashad

Raoof

Ashraf

et al. 2018

Mathematical Problems in Engineering

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DC microgrids look attractive in distribution systems due to their high reliability, high efficiency, and easy integration with renewable energy sources. The key objectives of the DC microgrid include proportional load sharing and precise voltage regulation. Droop controllers are based on decentralized control architectures which are not effective in achieving these objectives simultaneously due to the voltage error and load power variation. A centralized controller can achieve these objectives using a high speed communication link. However, it loses reliability due to the single point failure. Additionally, these controllers are realized through proportional integral (PI) controllers which cannot ensure load sharing and stability in all operating conditions. To address limitations, a distributed architecture using sliding mode (SM) controller utilizing low bandwidth communication is proposed for DC microgrids in this paper. The main advantages are high reliability, load power sharing, and precise voltage regulation. Further, the SM controller shows high robustness, fast dynamic response, and good stability for large load variations. To analyze the stability and dynamic performance, a system model is developed and its transversality, reachability, and equivalent control conditions are verified. Furthermore, the dynamic behavior of the modeled system is investigated for underdamped and critically damped responses. Detailed simulations are carried out to show the effectiveness of the proposed controller.

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An Improved Distributed Secondary Control Method for DC Microgrids With Enhanced Dynamic Current Sharing Performance

Cited by 312 publications

References 34 publications

Decentralised control method for DC microgrids with improved current sharing accuracy

Decentralised control method for DC microgrids with improved current sharing accuracy

An Enhanced Secondary Control Approach for Voltage Restoration in the DC Distribution System

Proportional Load Sharing and Stability of DC Microgrid with Distributed Architecture Using SM Controller

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