Power Sharing Method for a Grid connected Microgrid with Multiple Distributed Generators

Nguyen, Khanh-Loc; Won, Dong-Jun; Ahn, Seon-Ju; Chung, Ilyong

doi:10.5370/jeet.2012.7.4.459

Cited by 29 publications

(29 citation statements)

References 24 publications

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“…Under balanced conditions, the aforementioned state equations (1) in the stationary abc reference frame can be transformed to the equations in the stationary αβ reference frame by using the following expression [2], [3]:…”

Section: System Description and Mathematical Modelmentioning

confidence: 99%

A Strategy Based Adaptive Voltage Controller and Optimal Load Current Observer for Three-Phase Inverter in Stand-Alone Distributed Generation Systems

2017

IJAERD

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Section: System Description and Mathematical Modelmentioning

confidence: 99%

A Strategy Based Adaptive Voltage Controller and Optimal Load Current Observer for Three-Phase Inverter in Stand-Alone Distributed Generation Systems

2017

IJAERD

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“…The parameter i c in (13) and (14) are set to 0.15, 0.15, and 0.05 for DG1, DG2, and BESS, respectively. Because the full output power of DG1 can be expressed as 0.3 p.u.…”

Section: Simulation Studiesmentioning

confidence: 99%

“…Therefore, the power margin of each power inverters should be measured accurately and the amount of harmonic compensation should be distributed appropriately to multiple DRs. Second, DRs have diverse control scheme depending on their types and operational strategies [12][13]. Therefore, the multiple objective functions should be considered to coordinate of multiple DRs.…”

Section: Introductionmentioning

confidence: 99%

Intelligent Coordination Method of Multiple Distributed Resources for Harmonic Current Compensation in a Microgrid

Kang¹,

Yoo²,

Chung³

et al. 2012

Journal of Electrical Engineering and Technology

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-Nonlinear electronic loads draw harmonic currents from the power grids that can cause energy loss, miss-operation of power equipment, and other serious problems in the power grids. This paper proposes a harmonic compensation method using multiple distributed resources (DRs) such as small distributed generators (DGs) and battery energy storage systems (BESSs) that are integrated to the power grids through power inverters. For harmonic compensation, DRs should inject additional apparent power to the grids so that certain DRs, especially operated in proximity to their rated power, may possibly reach their maximum current limits. Therefore, intelligent coordination methods of multiple DRs are required for efficient harmonic current compensation considering the power margins of DRs, energy cost, and the battery state-of-charge. The proposed method is based on fuzzy multiobjective optimization so that DRs can cooperate with other DRs to eliminate harmonic currents with optimizing mutually conflicting multi-objectives.

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“…Under balanced conditions, the above state equations (1) in the stationary abc reference frame can be transformed to the equations in the stationary αβ reference frame by using the following expression [2]- [3] …”

Section: System Description and Mathematical Modelmentioning

confidence: 99%

An Adaptive Voltage Control Strategy of Three-Phase Inverter for Stand-Alone Distributed Generation Systems

Duc

Leu

Choi

et al. 2013

IEEE Trans. Ind. Electron.

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Abstract-This paper proposes an adaptive control method of three-phase inverter for standalone distributed generation systems (DGSs). The proposed voltage controller includes two control terms: an adaptive compensating term and a stabilizing term. The adaptive compensating control term is constructed to avoid directly calculating the time derivatives of state variables. Meanwhile, the stabilizing control term is designed to asymptotically stabilize the error dynamics of the system. Also, a fourth-order optimal load current observer is proposed to reduce the number of current sensors and enhance the system reliability and cost effectiveness. Stability of the proposed voltage controller and the proposed load current observer is fully proven by using Lyapunov theory. The proposed control system can establish good voltage regulation such as fast dynamic response, small steady state error, and low total harmonic distortion (THD) under sudden load change, unbalanced load, and nonlinear load. Finally, the validity of the proposed control strategy is verified through simulations and experiments on a prototype DGS testbed with a TMS320F28335 DSP. For a comparative study, the feedback linearization for multi-input and multi-output (FL-MIMO) control scheme is implemented and its results are presented in this paper.Index Terms-Adaptive control, distributed generation system (DGS), load current observer, standalone, three-phase inverter, voltage control. I. INTRODUCTIONDistributed generation systems (DGSs) using renewable energy sources (such as wind turbines, photovoltaic arrays, biomass, fuel cells, etc.) are gaining more and more attention in electric power industry to replace existing fossil fuels and reduce global warming gas emissions. Nowadays, the DGSs are extensively used in grid-connected applications, but they are more economical in a standalone operation in case of rural villages or remote islands because connecting to the grid may lead to higher cost [1]- [5].In standalone applications, the load-side inverter of the Manuscript received May 31, 2012; revised September 21, 2012; accepted for publication November 10, 2012. This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MEST) (No. 2012R1A2A2A01045312).Copyright (c) 2012 IEEE. Personal use of this material is permitted. However, permission to use this material for any other purposes must be obtained from the IEEE by sending a request to pubs-permissions@ieee.org.The authors are with the Division of Electronics and Electrical Engineering, Dongguk University-Seoul, Seoul 100-715, South Korea (email: jinwjung@dongguk.edu).DGS operates analogous to an uninterruptible power supply (UPS) for its local loads [6]. Control of standalone DGSs or UPSs is an attractive research area in recent years. In these applications, the regulation performance of inverter output voltage is evaluated in terms of transient response time, steady state error, and total harmonic distortion (THD). Furthermore, the quality of invert...

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Power Sharing Method for a Grid connected Microgrid with Multiple Distributed Generators

Cited by 29 publications

References 24 publications

A Strategy Based Adaptive Voltage Controller and Optimal Load Current Observer for Three-Phase Inverter in Stand-Alone Distributed Generation Systems

A Strategy Based Adaptive Voltage Controller and Optimal Load Current Observer for Three-Phase Inverter in Stand-Alone Distributed Generation Systems

Intelligent Coordination Method of Multiple Distributed Resources for Harmonic Current Compensation in a Microgrid

An Adaptive Voltage Control Strategy of Three-Phase Inverter for Stand-Alone Distributed Generation Systems

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