Mode-Adaptive Decentralized Control for Renewable DC Microgrid With Enhanced Reliability and Flexibility

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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“…where ω c is the cutting frequency of the low pass filter for output current, the voltage loop G conv (s) ≃ 1 [30].…”

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

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“…Droop schemes have been employed to control the load sharing among dispatchable energy units in dc MGs [10], [21]- [23]. Droop controlled converters in dc MGs can be modeled as an ideal voltage source in series with a droop resistance [22], [23].…”

Section: Modal Analysismentioning

confidence: 99%

“…Droop controlled converters in dc MGs can be modeled as an ideal voltage source in series with a droop resistance [22], [23]. Fig.…”

Section: Modal Analysismentioning

confidence: 99%

On Secondary Control Approaches for Voltage Regulation in DC Microgrids

Peyghami

Mokhtari

Davari³

et al. 2017

IEEE Trans. on Ind. Applicat.

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“…Energy storage systems (ESS) with bidirectional DC-DC converters are essential in renewable energy based microgrids, electric vehicles (EVs), transportations, et al [1][2][3][4][5]. Bidirectional DC-DC converters play the role of converting and transferring the electrical energy of the storage elements, which conduct both charge and discharge operation.…”

Section: Introductionmentioning

confidence: 99%

Non-isolated stacked bidirectional soft-switching DC-DC converter with PWM plus phase-shift control scheme

Jiang²,

Yang

et al. 2017

J. Mod. Power Syst. Clean Energy

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In this paper, a non-isolated stacked bidirectional DC-DC converter with zero-voltage-switching (ZVS) is introduced for the high step-up/step-down conversion systems. The extremely narrow turn-on and/or turn-off duty cycle existing in the conventional bidirectional buck-boost converters can be extended due to the stacked module configuration for large voltage conversion ratio applications. Furthermore, the switch voltage stress is halved because of the series connection of half bridge modules. The PWM plus phase-shift control strategy is employed, where the duty cycle is adopted to regulate the voltages between the input and output sides and the phaseshift angle is applied to achieve the power flow regulation.This decoupled control scheme can not only realize seamless bidirectional transition operation, but also achieve adaptive voltage balance for the power switches. In addition, ZVS soft-switching operation for all active switches is realized to minimize the switching losses. Finally, a prototype of 1 kW operating at 100 kHz is built and tested to demonstrate the effectiveness of the proposed converter and the control strategy.

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Mode-Adaptive Decentralized Control for Renewable DC Microgrid With Enhanced Reliability and Flexibility

Cited by 362 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

On Secondary Control Approaches for Voltage Regulation in DC Microgrids

Non-isolated stacked bidirectional soft-switching DC-DC converter with PWM plus phase-shift control scheme

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