Adaptive Droop Control Strategy for Load Sharing and Circulating Current Minimization in Low-Voltage Standalone DC Microgrid

Augustine, Sijo; Mishra, Mahesh K.; Lakshminarasamma, N

doi:10.1109/tste.2014.2360628

Cited by 402 publications

(164 citation statements)

References 28 publications

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“…Since load resistance is much larger than line resistances [28], the differential form of (13) can be expressed aṡ…”

Section: Proposed Improved Droop Control Methodsmentioning

confidence: 99%

“…At t 2 moment, system arrives at steady state I, but change rate of output voltage of each DG does not equal to zero. According to (28), the voltage stabiliser will shift the proposed droop curve by generating an increment of i * dc which will forceu dc towards to zero. At t 3 moment, change rate of output voltage becomes zerou dc (t 3 ) = 0 and output voltage maintains stable, the system arrives at steady state II.…”

Section: Complementary Voltage Stabilisermentioning

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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“…Since load resistance is much larger than line resistances [28], the differential form of (13) can be expressed aṡ…”

Section: Proposed Improved Droop Control Methodsmentioning

confidence: 99%

Section: Complementary Voltage Stabilisermentioning

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

show abstract

“…The impedances of the cables from the convertes to the load is supposed as the pure resistances. The load is a equivalent pure resistor load [9,10].…”

Section: The Circuit Of the DC Microgrid Control Systemmentioning

confidence: 99%

Parameters Designing of Slide Mode Variable Structure Controller of Bus Voltage of DC Microgrid Based on Proportion Switching Function

2017

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Abstract. Constant value control of the DC-bus voltage is a essential problem of the control system of the DC microgrids. DC-DC converters are applied in parallel to realize the transform of energy from the distributed generations (DGs) to the DC-bus. Droop control methods are applied to the DC-bus voltage while PI controllers are used in controlling the duty ratios of the converters. This method may bring out the slow response speed of the system accompanied by the large ripple of the voltage. The slide mode variable structure control can speed up the response and reduce the ripple of the voltage as well. In the traditional slide mode control based on the proportion switching function, the denominator of the transfer function of the controlled plant is a second-order characteristic polynomial without the constant term. The denominators of the transfer functions of the buck DC-DC converters contain the constant terms. The designing of the parameters of the slide mode control based on the proportion switching function is analyzed based on mathematics deductions. Simulation results show that the selected parameters can not only speed up the response of the system but also greatly reduce the ripple of the voltage.

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“…Considering the above facts, it is a nature idea to integrate different types of DC-coupled DERs and loads using DC common bus. Therefore, a DC microgrid is thereby established [5][6]. Compared to AC microgrids, DC microgrid is coupled using DC bus, as shown in the typical configuration in Fig.…”

Section: Introductionmentioning

confidence: 99%

Looped-chain-based active current sharing strategy in DC microgrids

Liu

et al. 2017

Archives of Electrical Engineering

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Abstract:The integration of renewable energy sources in modern electric grids have drawn increasing attention nowadays. In order to effectively manage large-scale renewable energy sources and achieve flexible and efficient operation, the concept of microgrids have been proposed. Considering the nature of DC outputs in many distributed energy resources (DERs), DC microgrids have been extensively studied in the past years. Among the operational issues in DC microgrids, current sharing issues have become an important topic since it is highly relevant to the operation of DC microgrids. By adopting a proper design of current sharing strategy in DC microgrids, the current rating violations in each interface converter can be successfully avoided. In this paper, a looped-chainbased active current sharing strategy is proposed to realize high accuracy current sharing in DC microgrids. In particular, the output current is shared between the neighboring interface converters. Hence, following a clockwise or counter-clockwise order, a loopedchain-based control diagram can be established to share the reference value of the output current. A final status in the whole DC microgrid is that the output current of every interface converter is equalized. Hence, the desired current sharing objective can be satisfied. A MATLAB simulation model is established to verify the proposed loopedchain-based active current sharing strategy in DC microgrids.

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Adaptive Droop Control Strategy for Load Sharing and Circulating Current Minimization in Low-Voltage Standalone DC Microgrid

Cited by 402 publications

References 28 publications

Decentralised control method for DC microgrids with improved current sharing accuracy

Decentralised control method for DC microgrids with improved current sharing accuracy

Parameters Designing of Slide Mode Variable Structure Controller of Bus Voltage of DC Microgrid Based on Proportion Switching Function

Looped-chain-based active current sharing strategy in DC microgrids

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