Performance analysis of hybrid microgrids applying SoC-adaptive droop control

Gkountaras, Aris; Dieckerhoff, Sibylle; Sezi, Tevfik

doi:10.1109/epe.2014.6910834

Cited by 6 publications

(2 citation statements)

References 14 publications

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“…In [47], the fuzzy control system is employed to obtain the VR which is used to balance the SoC and reduce the voltage deviation at the common DC bus. In [61], a modified curve of injected/extracted power set point vs. SoC is proposed. The safe range of the SoC is selected as 10% ~ 90%.…”

Section: A Decentralized Controlmentioning

confidence: 99%

DC Microgrids–Part I: A Review of Control Strategies and Stabilization Techniques

Dragičević

Liu

Vasquez

et al. 2015

IEEE Trans. Power Electron.

1,083

647

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This paper presents a review of control strategies, stability analysis and stabilization techniques for DC microgrids (MGs). Overall control is systematically classified into local and coordinated control levels according to respective functionalities in each level. As opposed to local control which relies only on local measurements, some line of communication between units needs to be made available in order to achieve coordinated control. Depending on the communication method, three basic coordinated control strategies can be distinguished, i.e. decentralized, centralized and distributed control. Decentralized control can be regarded as an extension of local control since it is also based exclusively on local measurements. In contrast, centralized and distributed control strategies rely on digital communication technologies. A number of approaches to using these three coordinated control strategies to achieve various control objectives are reviewed in the paper. Moreover, properties of DC MG dynamics and stability are discussed. The paper illustrates that tightly regulated point-of-load (POL) converters tend to reduce the stability margins of the system since they introduce negative impedances, which can potentially oscillate with lightly damped power supply input filters. It is also demonstrated how the stability of the whole system is defined by the relationship of the source and load impedances, referred to as the minor loop gain. Several prominent specifications for the minor loop gain are reviewed. Finally, a number of active stabilization techniques are presented. Index Terms-DC microgrid (MG), local control, coordinated control, impedance specifications, stability. NOMENCLATURE Acronyms AVP Adaptive voltage positioning. BLDC Brushless DC. CC Central controller. CPL Constant power load. DBS DC bus signaling. DCL Digital communication link. DG Distributed generator. DPS Distributed power system. EET Extra element theorem. ESAC Energy storage analysis consortium. ESS Energy storage system. EV Electric vehicle. GM Gain margin.

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Section: A Decentralized Controlmentioning

confidence: 99%

DC Microgrids–Part I: A Review of Control Strategies and Stabilization Techniques

Dragičević

Liu

Vasquez

et al. 2015

IEEE Trans. Power Electron.

1,083

647

View full text Add to dashboard Cite

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“…Droop coefficient adjustment based on fuzzy logic is used in [143] to balance SoC of the ESS, whereas fuzzy logic based VR is employed to balance SoC of multiple ESSs in [144]. Adaptive droop adjustment needs expertise, and improper setting of droop curve may lead to the unstable operation of DC microgrid [145], [146]. PLS is also used in the decentralized method, which is a communication based method, and it is complex to implement than other two methods [147], [148].…”

Section: ) Decentralized Controlmentioning

confidence: 99%

Stability and Control Aspects of Microgrid Architectures–A Comprehensive Review

et al. 2020

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Self-governing small regions of power systems, known as "microgrids", are enabling the integration of small-scale renewable energy sources (RESs) while improving the reliability and energy efficiency of the electricity network. Microgrids can be primarily classified into three types based on their voltage characteristics and system architecture; 1) AC microgrids, 2) DC microgrids, and 3) Hybrid AC/DC microgrids. This paper presents a comprehensive review of stability, control, power management and fault ride-through (FRT) strategies for the AC, DC, and hybrid AC/DC microgrids. This paper also classifies microgrids in terms of their intended application and summarises the operation requirements stipulated in standards (e.g., IEEE Std. 1547. The control strategies for each microgrid architecture are reviewed in terms of their operating principle and performance. In terms of the hybrid AC/DC microgrids, specific control aspects, such as mode transition and coordinated control between multiple interlinking converters (ILCs) and energy storage system (ESS) are analysed. A case study is also presented on the dynamic performance of a hybrid AC/DC microgrid under different control strategies and dynamic loads. Hybrid AC/DC microgrids shown to have more advantages in terms of economy and efficiency compared with the other microgrid architectures. This review shows that hierarchical control schemes, such as primary, secondary, and tertiary control are very popular among all three microgrid types. It is shown that the hybrid AC/DC microgrids require more complex control strategies for power management and control compared to AC or DC microgrids due to their dependency on the ILC controls and the operation mode of the hybrid AC/DC microgrid. Case study illustrated the significant effects of microgrid feeder characteristics on the dynamic performance of the hybrid AC/DC microgrid. It is also revealed that any transient conditions either in the AC or DC microgrids could propagate through the ILC affecting the entire microgrid dynamic performance. Additionally, the critical control issues and the future research challenges of microgrids are also discussed in this paper.INDEX TERMS Energy storage system (ESS), hybrid AC/DC microgrid, IEEE Std. 1547-2018, interlinking converter (ILC), microgrid stability, power management, renewable energy sources (RESs).

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