A Multifunctional and Wireless Droop Control for Distributed Energy Storage Units in Islanded AC Microgrid Applications

Sun, Xiaofeng; Hao, Yancong; Wu, Qingfeng; Guo, Xiaoqiang; Wang, Baocheng

doi:10.1109/tpel.2016.2531379

Cited by 84 publications

(68 citation statements)

References 36 publications

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“…Although the rank of coefficient matrix E−M is n (rank (E−M) < n + 1), the solution space of (19) is still definite for an initial condition f * (0) = 50 − mQ * (i.e., special solution). The CFR calculation is similar to an iteration process of (14) with the initial value: 50 − mQ * . Due to the uncertainty of load changes, it is preferential to obtain the frequency reference at the current running moment.…”

Section: Of 18mentioning

confidence: 99%

“…Due to the uncertainty of load changes, it is preferential to obtain the frequency reference at the current running moment. Even in case of continuous or frequent load variations, the proposed CFR calculation at all load change moments is feasible, otherwise, use (14) directly to calculate the frequency reference at the current running moment. …”

Section: Of 18mentioning

confidence: 99%

“…Relative to point O, frequency references reduce as much as original frequency increases (∆ f (j − 1), ∆ f (j)). When loads change at t = j, DG reactive power output is changed from Q (j − 1) to Q(j) and frequency reference is changed from f * (j − 1) to f * (j) according to (14). If frequency reference remains constant at t = j, the frequency deviation ∆ f (j) will exist.…”

Section: Of 18mentioning

confidence: 99%

See 2 more Smart Citations

An Improved Droop Control Strategy Based on Changeable Reference in Low-Voltage Microgrids

et al. 2017

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This paper proposes an improved droop control strategy based on changeable reference in low-voltage microgrids. To restore running frequency of distributed generation to a rated value without affecting its reactive power output, changeable frequency reference, mainly compensating for frequency deviation, are proposed corresponding to various load demands. In terms of active power sharing inaccuracy associated with mismatched line impedance, changeable voltage amplitude reference is proposed to obtain a droop line suitable for the actual voltage of distributed generations. By further improvement of the active droop coefficient, power sharing is accurate with a difference in actual voltages of distributed generations. Virtual negative inductance is used to neutralize the redundant line inductance for strictly improving sharing accuracy. A robust control method based on Lyapunov function is used to handle the robustness problem in case of load variation. The control scheme is entirely decentralized, so communication links among distributed generations are redundant. Finally, simulation studies demonstrate the effectiveness of a control strategy.

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Section: Of 18mentioning

confidence: 99%

Section: Of 18mentioning

confidence: 99%

Section: Of 18mentioning

confidence: 99%

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An Improved Droop Control Strategy Based on Changeable Reference in Low-Voltage Microgrids

et al. 2017

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“…In essence, the 'modified global indicator' concept has been demonstrated to be effective for improving reactive power sharing in ac MGs, but only in typical structure with common bus [13,14]. In this paper, we extend the application of such global indicator concept to dc MGs with multiple buses.…”

Section: Introductionmentioning

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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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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“…A small power system consisting of power converter-based generation, ES devices, small classic synchronous generation, and various types of loads forms a microgrid (MG) [4]. While a number of research works on MG have been done on various aspects, including control strategy [5][6][7][8][9][10], energy management systems [11][12][13][14][15][16][17], marketing policies [18][19][20][21] and system design [22][23][24][25][26][27], this paper mainly focuses on the optimal sizing of Distributed Energy Resources (DERs), especially the capacity of ES devices in MG.…”

Section: Introductionmentioning

confidence: 99%

Optimized Planning of Power Source Capacity in Microgrid, Considering Combinations of Energy Storage Devices

et al. 2016

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Since renewable energy resource is universally accepted as a promising method to solve the global energy problem, optimal planning and utilization of various distributed generators (DG) and energy storage (ES) devices deserve special concern. ES devices possess various characteristics in power density, energy density, response speed (switching speed) and lifetime. Besides, as different load types have various requirements on power supply reliability according to their importance, coordinated planning with consideration of reasonable matching between power source and load can efficiently improve power supply reliability and economic efficiency via a customized power supply and compensation strategy. This paper focuses on optimization of power source capacity in microgrid and a coordinated planning strategy is proposed with integrated consideration of characteristics of DG, ES and load. An index named additional compensation ratio (ACR) for balancing economic efficiency and reliability is proposed and considered in the strategy. The objective function which aims to minimize life cycle cost (LCC) is established considering economic efficiency, reliability and environmental conservation. The proposed planning strategy and optimizing model is calculated and verified through case study of an autonomy microgrid.

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A Multifunctional and Wireless Droop Control for Distributed Energy Storage Units in Islanded AC Microgrid Applications

Cited by 84 publications

References 36 publications

An Improved Droop Control Strategy Based on Changeable Reference in Low-Voltage Microgrids

An Improved Droop Control Strategy Based on Changeable Reference in Low-Voltage Microgrids

Decentralised control method for DC microgrids with improved current sharing accuracy

Optimized Planning of Power Source Capacity in Microgrid, Considering Combinations of Energy Storage Devices

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