An improved droop control for simultaneous voltage and frequency regulation in an AC microgrid using fuzzy logic

Ahmadi, Saleh; Bevrani, Hassan; Shokoohi, Shoresh; Hasanii, Elham

doi:10.1109/iraniancee.2015.7146455

Cited by 5 publications

(6 citation statements)

References 17 publications

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“…Besides, the angular frequency of DG 1 is set as the reference angular frequency for the DG 2 . Region 2 and 6 are formed by using (21), which contains LCL filters of each DG unit. Region 3 and 7 are formed by the loads, and virtual resistors are depicted in region 4.…”

Section: E Linearized Model Of the Complete Mg Systemmentioning

confidence: 99%

“…In order to deal with the above problems in the islanded microgrid, a number of improved control methods have been proposed, which can be divided into improved droop control [20][21][22][23][24][25] and improved secondary control methods [26][27][28][29][30][31][32][33][34]. An improved virtual power-based control method with a unified rotation angle in the power transformation has been presented in [20], which can effectively realize power decoupling and then ensure system stability.…”

Section: Introductionmentioning

confidence: 99%

“…However, since the voltage and current control loops, filters and loads are not considered in the small-signal model of the presented control strategy, the analysis of stability of the system is incomplete. A fuzzy logicbased improved droop control method is presented to balance the state of charge of DG energy storage systems [21]. However, the disturbance of the feeders and loads are not considered.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of Washout Filter-Based Power Sharing Strategy—An Equivalent Secondary Controller for Islanded Microgrid Without LBC Lines

Han

Xu³

et al. 2018

IEEE Trans. Smart Grid

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As a supplement of the droop control, the concept of secondary controlled microgrid (MG) has been extensively studied for voltage and frequency restoration. However, the low band-width communication (LBC) channels are needed to exchange information between the primary and secondary controllers, and the performance of the secondary controller degrades due to the uncertain communication delay and data drop-out in the LBC lines. Recently, a washout filter-based power sharing method was presented without communication lines and additional control loops. In this paper, the equivalence between secondary control and washout filter-based power sharing strategy for islanded microgrid is demonstrated, and the generalized washout filter control scheme has been obtained. Additionally, the physical meaning of control parameters of secondary controllers is also presented. Besides, a complete small-signal model of the generalized washout filter-based control method for islanded MG system is built, which can be utilized to design the control parameters and analyze the stability of MG system. Finally, extensive simulation and experimental results are provided to confirm the validity and effectiveness of the derived equivalent control scheme for islanded MG.

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Section: E Linearized Model Of the Complete Mg Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Washout Filter-Based Power Sharing Strategy—An Equivalent Secondary Controller for Islanded Microgrid Without LBC Lines

Han

Xu³

et al. 2018

IEEE Trans. Smart Grid

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“…In this way, the energy storage system reduces the power variation and controls the voltage and frequency stability. In [14], a fuzzy approach was considered for generalized droop control depending on an intelligent model for voltage and frequency regulation in a microgrid. In this case, fuzzy logic is utilized to adjust the coefficients of droop control-based voltage and frequency regulation optimally.…”

Section: Introductionmentioning

confidence: 99%

Modeling of Parallel Distributed Inverters Incorporating Millimeter Wave Communications for an Islanded AC Microgrid

Tiwari

Islam

Mahin

et al. 2022

Preprint

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With the recent increase in renewable penetration, the electrical network system has changed greatly in structure, function, and operating characteristics. Recently, inverter-based microgrids working in grid-connected and islanded mode are the prominent sources of power to harness renewable energy. This paper presents a model of a microgrid containing parallel inverters, supported by a millimeter wave-based communication system to provide power to critical loads in an islanded scenario. The communication system is mainly utilized for assisting the power sharing of the inverters. To evaluate the performance of the proposed scheme, a six-bus modified IEEE test system is considered having six inverters and is tested on inductive and capacitive loads for different line impedances. Moreover, the control center of the microgrid has plug and play options to switch on and off inverters during operating and emergency conditions. Furthermore, the performance of the communication network has been thoroughly analyzed in terms of communication latency and bandwidth. Results show that the proposed microgrid model along with modified proportional integral derivative (MPID) allows accurate power sharing among the inverters with minimal fluctuations under different testing conditions for both resistive and reactive line impedances. The smooth transition from grid-connected mode to islanded mode shows that the designed system can ensure power availability during emergency conditions.

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“…A DC nanogrid can operate in standalone mode or connected to a local power grid. It is also possible to distribute energy through an ac bus, i.e., ac nanogrid, or using a hybrid approach [10]- [14].…”

Section: Introductionmentioning

confidence: 99%

High-Voltage Gain DC-DC Converter For Photovoltaic Applications In DC Nanogrids

Pontes¹,

Silva²,

Sá³

2020

Eletrônica de Potência

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Photovoltaic (PV) systems used in DC Nanogrids present prominent advantages associated with low maintenance need and operation costs. Owing to the low output voltage of the PV module, highly efficient high-voltage gain DC-DC converters are required for connection with the DC nanogrid. This work presents a novel DC-DC converter topology with current source characteristic for PV applications and current injection in DC nanogrids. The introduced converter uses coupled inductors and switched capacitors to achieve high voltage gain with low component count and without using extreme duty ratios. Besides, the main switch is turned on with nearly zero current, thus contributing to minimized switching losses. The qualitative and quantitative analyzes of the circuit are presented in detail and a prototype rated at 200 W is developed and evaluated in the laboratory. Experimental results demonstrate efficient renewable energy conversion, where the maximum efficiency is 96.8%.

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An improved droop control for simultaneous voltage and frequency regulation in an AC microgrid using fuzzy logic

Cited by 5 publications

References 17 publications

Analysis of Washout Filter-Based Power Sharing Strategy—An Equivalent Secondary Controller for Islanded Microgrid Without LBC Lines

Analysis of Washout Filter-Based Power Sharing Strategy—An Equivalent Secondary Controller for Islanded Microgrid Without LBC Lines

Modeling of Parallel Distributed Inverters Incorporating Millimeter Wave Communications for an Islanded AC Microgrid

High-Voltage Gain DC-DC Converter For Photovoltaic Applications In DC Nanogrids

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