A new unified control strategy for inverter-based micro-grid using hybrid droop scheme

Aboushal, M. A.; Moustafa, Mohamed M. Zakaria

doi:10.1016/j.aej.2019.10.006

Cited by 10 publications

(8 citation statements)

References 28 publications

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“…19. is the phase angle of VSC output voltage and _ is angular frequency error generated by loop filter of SRF-PLL can be calculated as [37]…”

Section: Srf-pllmentioning

confidence: 99%

Power Quality Enhancement For Decentralized Microgrids in Island Mode

Rasheed¹,

Gelani²,

Tahir³

et al. 2022

Preprint

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The microgrid is a small-scale, autonomous decentralized power plant with its own distributed generation, storage capacity and multiple loads, with the capacity to function in grid interconnected and an island mode. The decentralized control of microgrids with parallel operated voltage source converters (VSCs) is proposed in this paper to improve power quality using a machine learning approach. The DNN based MPPT controller is proposed and its best performance is presented. The SRF-PLL is utilized for AC side synchronization in VSC control. The proposed microgrid involves two PV arrays fed to two voltage source converters along with their independent controls, connected in parallel through LC filters and line coupling transformers and serves the loads at PCC. The proposed model is simulated using MATLAB/Simulink. The dq-framed inner loop control is employed to individually regulate the real and reactive power at the point of common coupling. Furthermore, the proposed model is analyzed and compared by employing a mathematical model of AC system dynamics, inner loop control, output voltage quality, AC harmonic spectrum analysis, and total harmonic distortion (THD) in both grid interconnected and island mode. In island mode, AC harmonic spectrum and THD are accomplished within the permissible range.

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“…19. is the phase angle of VSC output voltage and _ is angular frequency error generated by loop filter of SRF-PLL can be calculated as [37]…”

Section: Srf-pllmentioning

confidence: 99%

Power Quality Enhancement For Decentralized Microgrids in Island Mode

Rasheed¹,

Gelani²,

Tahir³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…In [173] and [174], the line and filter voltage drop is compensated by adding the voltage error signal to the reference voltage of droop. [187] implements the same concept in the currentcontrolled mode. In the virtual impedance method, by adding the virtual impedance in the control loop, the dominant impedance is controlled to be inductive [188], [184], or resistive [189].…”

Section: Hybrid Droopmentioning

confidence: 99%

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

et al. 2021

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This work analyzes interlinking converter control in hybrid AC/DC microgrids. The paper addresses the state-of-the-art general hybrid microgrid structure. The key power electronics topologies are used as bidirectional interface converters in the AC and DC parts. Different control structures of hybrid microgrids are categorized, followed by the classification of the main control functions, their control strategies, and the control techniques and a summary of their positive and negative aspects and applications. Control functions, their strategies and techniques are classified in the interlinking-converter based. Finally, overall control objectives, time-scaled control structures, and their strategies are outlined. The prospects, main challenges, research gaps, and the trend of the hybrid microgrid structure and control are reviewed and summarized in the conclusions.

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“…Parallel‐operated VSIs in the grid‐connected mode inject active and reactive power to the grid, 5 while appropriate voltage and frequency are provided by the main grid for proper operation of VSIs. The droop‐based control approach, due to its advantages such as simplicity, not needing a communication link and autonomous operation, is widely used in islanded MGs with parallel‐operated VSIs 6 . In the islanded operation mode, VSIs are responsible for providing voltage and frequency in the allowable range in addition to supplying the demanded load 5,7 .…”

Section: Introductionmentioning

confidence: 99%

“…The droop-based control approach, due to its advantages such as simplicity, not needing a communication link and autonomous operation, is widely used in islanded MGs with parallel-operated VSIs. 6 In the islanded operation mode, VSIs are responsible for providing voltage and frequency in the allowable range in addition to supplying the demanded load. 5,7 Power sharing is one of the main issues in islanded MGs with parallel-operated VSIs addressed by several publications in the literature.…”

Section: Introductionmentioning

confidence: 99%

Microgrid‐based parallel‐operated voltage‐source inverters: Stability analysis and enhancement in presence of active loads

Khalooei,

Rahimi

2023

Energy Science & Engineering

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This paper deals with the stability analysis and enhancement in the AC‐microgrid system comprising parallel‐operated voltage‐source inverters (VSIs) supplying an active‐load. The active‐load behaves such as a constant power load from the AC‐side. In the paper, two models for the active‐load modeling in the AC microgrid are considered: (i) simple model in which the active‐load is modeled as an ideal current source, (ii) detailed model in which all dynamics of the active‐load converter and related controllers are taken into account. The main findings and contribution of this paper are as follows. (a) All linearized state equations of the study system are extracted and transferred into a unified common dq‐reference frame, and then, small‐signal stability of the study system is carried out in the common reference frame by using the simple and detailed models of the active‐load. (b) It is shown that the simple model of the active‐load, as a current source, leads to more pessimistic results in comparison to the active‐load detailed model. (c) Impacts of the active‐load power and bandwidth of the active‐load voltage control loop on the system stability are examined. (d) Control of the generation‐side VSIs is modified and a stabilizing approach, called generation‐side virtual capacitor, is proposed for stabilizing the system under high active‐load penetration. Next, modal analysis and time‐domain simulations are used to investigate the study system responses with and without the proposed stabilizing approach.

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A new unified control strategy for inverter-based micro-grid using hybrid droop scheme

Cited by 10 publications

References 28 publications

Power Quality Enhancement For Decentralized Microgrids in Island Mode

Power Quality Enhancement For Decentralized Microgrids in Island Mode

Recent Contributions, Future Prospects and Limitations of Interlinking Converter Control in Hybrid AC/DC Microgrids

Microgrid‐based parallel‐operated voltage‐source inverters: Stability analysis and enhancement in presence of active loads

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