Robust MMSOGI‐FLL control algorithm for power quality improvement of solar PV‐SyRG pico hydro‐BES based islanded microgrid with dynamic load

Sharma, Rohini; Kewat, Seema; Singh, Bhim

doi:10.1049/iet-pel.2019.1002

Cited by 15 publications

(7 citation statements)

References 28 publications

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“…In literature, many synchronization methods are presented such as synchronous reference frame phase locked loop (SRF-PLL), generalized integrator (GI), second order generalized integrator (SOGI), double fundamental signal extractor (DFSE) etc. While SRF-PLL, GI and SOGI-PLL outputs suffered from sinusoidal ripple in estimated frequency [13], phase shifted fundamental [14,15], direct current (DC) offsets and sub-harmonics [16], modified SOGI (MSOGI) [17], second order SOGI (SO-SOGI) [18], mixed second and third order generalized integrator (MSTOGI) [19] and modified multi SOGI-FLL [20] tried to resolve them but suffered from poor performance of lower order dominant harmonics and slow response. Further, slow response problem of the PLL topologies [21], were replaced by frequency locked loop (FLL) [22,23].…”

Section: Introductionmentioning

confidence: 99%

An active clamped L‐L type ZVS current‐fed front‐end DC–DC converter based solid state transformer in grid connected mode PV applications

Kumar,

Agarwal

2023

IET Power Electronics

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This paper utilised a solid‐state transformer (SST) with an active clamped L‐L type current fed front‐end converter for maximum power extraction (MPE) and voltage boost operation. The proposed system employed perturb and observe (P&O) based MPE and upheld the ZVS operation of all primary side switches and ZCS operation of all secondary side rectifier diodes for various insolation conditions. The proposed system developed a new fundamental extractor titled multi‐level cascaded dual double fundamental signal extractor (MCDDFSE) and is utilized in the control algorithm for synchronization with the utility grid. The main objective of the proposed system was to deliver a compact size, reduced weight and cheaper magnetic components‐based front‐end converter of SST on the photovoltaic (PV) array side and a fast, secure and trustworthy mitigation technique for the grid current harmonics on the utility grid side. The proposed system was trialled on the platform of OPAL‐RT (RT‐LABv2021.3.2.307) for various grid abnormalities and its behaviour was found well within the IEEE 519 standards.

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Section: Introductionmentioning

confidence: 99%

An active clamped L‐L type ZVS current‐fed front‐end DC–DC converter based solid state transformer in grid connected mode PV applications

Kumar,

Agarwal

2023

IET Power Electronics

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“…A microgrid comprising solar and wind needs a backup because of its intermittent nature. Inverter-connected battery backup is one of the proposals suggested in the study by Jayawardana et al (2019) and Sharma et al (2020). The other proposal is a connected diesel/biogas-based generating plant (Barik and Das, 2018).…”

Section: Introductionmentioning

confidence: 99%

Improving frequency response for AC interconnected microgrids containing renewable energy resources

Elshenawy

Fahmy²,

Elsamahy³

et al. 2022

Front. Energy Res.

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Interconnecting two or more microgrids can help improve power system performance under changing operational circumstances by providing mutual and bidirectional power assistance. This study proposes two interconnected AC microgrids based on three renewable energy sources (wind, solar, and biogas). The wind turbine powers a permanent magnet synchronous generator. A solar photovoltaic system with an appropriate inverter has been installed. In the biogas generator, a biogas engine is connected to a synchronous generator. M1 and M2, two interconnected AC microgrids, are investigated in this study. M2 is connected to a hydro turbine, which provides constant power. The distribution power loss, frequency, and voltage of interconnected AC microgrids are modeled as a multi-objective function (OF). Minimizing this OF will result in optimal power flow and frequency enhancement in interconnected AC microgrids. This research is different from the rest of the research works that talk about the virtual inertia control (VIC) method, as it not only improves frequency using an optimal controller but also achieves optimal power flow in microgrids. In this paper, the following five controllers have been studied: proportional integral controller (PI), fractional-order PI controller (FOPI), fuzzy PI controller (FPI), fuzzy fractional-order PI controller (FFOPI), and VIC based on FFOPI controller. The five controllers are tuned using particle swarm optimization (PSO) to minimize the (OF). The main contribution of this paper is the comprehensive study of the performance of interconnected AC microgrids under step load disturbances, the eventual grid following/forming contingencies, and the virtual inertia control of renewable energy resources used in the structure of the microgrids, and simulation results are recorded using the MATLAB™ platform. The voltages and frequencies of both microgrids settle with zero steady-state error following a disturbance within 0.5 s with less overshoots/undershoots (3.7e-5/-0.12e-3) using VIC. Moreover, the total power losses of two interconnected microgrids must be considered for the different controllers to identify which one provides the best optimal power flow.

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“…The most significant reported negative impacts of EAFs include voltage fluctuations [1,2], transient overvoltages [3], protection systems maloperation [4], power fluctuation [5][6][7], torsional vibrations [7,8] and mechanical oscillations of nearby generators shafts [9]. To resolve these issues, various solutions have been proposed such as using reactive power compensation devices, application of static VAR compensators (SVCs), active power filters, flexible AC transmission systems and energy storage systems [4,10,11]. It should be noted that the application of reactive power compensation devices and their control methods are more considered in the research works.…”

Section: Introductionmentioning

confidence: 99%

Governor controller improvement to enhance SSSG performance in presence of electrical arc furnace

Bekhradian

Sanaye‐Pasand

Davarpanah

et al. 2022

IET Generation Trans & Dist

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Electrical Arc Furnaces (EAFs) consume time‐varying power. This causes mechanical torque variations in the nearby small scale synchronous generators (SSSGs) and reduces their life expectancy. In this paper, an appropriate EAF model is implemented and verified by using field measurements. Moreover, an actual distribution system to which an SSSG is connected to supply industrial loads including an EAF is investigated based on time‐domain simulation studies. To enhance dynamic performance of the SSSG adjacent to an EAF load, two novel approaches are presented in this paper. The first method is utilized for proper adjustment of governor controller parameters. Analytical and simulation‐based studies are accomplished to determine proper parameters of the SSSG conventional governor controller to mitigate the mechanical oscillations caused by EAF. These comprehensive investigations reveal that the governor PI controller proportional parameter should be adjusted as small as possible to mitigate the SSSG oscillations; while, the oscillations are fairly independent of integrator parameter. Besides, the integrator parameter should be set as high as possible to improve the SSSG dynamic performance. Moreover, a new modified SSSG governor controller including steady‐state and transient control loops is developed and a novel control strategy is proposed to enhance steady‐state and transient performance of SSSG. Finally, robustness and effectiveness of the proposed controller and its parameters are investigated using field measured EAF current signals for various transients. It should be noted that the proposed strategies of this paper can be also applied to similar cases where a nonlinear time varying load is connected to an SSSG.

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Robust MMSOGI‐FLL control algorithm for power quality improvement of solar PV‐SyRG pico hydro‐BES based islanded microgrid with dynamic load

Cited by 15 publications

References 28 publications

An active clamped L‐L type ZVS current‐fed front‐end DC–DC converter based solid state transformer in grid connected mode PV applications

An active clamped L‐L type ZVS current‐fed front‐end DC–DC converter based solid state transformer in grid connected mode PV applications

Improving frequency response for AC interconnected microgrids containing renewable energy resources

Governor controller improvement to enhance SSSG performance in presence of electrical arc furnace

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