Construction of Nonlinear Droop Relations to Optimize Islanded Microgrid Operation

Elrayyah, Ali; Cingoz, Fatih; Sözer, Yilmaz

doi:10.1109/tia.2014.2387484

Cited by 62 publications

(30 citation statements)

References 25 publications

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“…In nonlinear droop control, the frequency and voltage of the system are changed as a function of the optimized sharing between the DGs of the active and reactive power, respectively. In [14] the authors apply this method to minimize the operating cost, verifying the effectiveness of the method in an experimental case study. The nonlinear-droop control is also mentioned in [15][16][17] where the authors propose different approaches to this issue.…”

Section: Introductionmentioning

confidence: 90%

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

et al. 2018

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The paper proposes an improved primary regulation method for inverter-interfaced generating units in islanded microgrids. The considered approach employs an off-line minimum losses optimal power flow (OPF) to devise the primary frequency regulation curve’s set-points while satisfying the power balance, frequency and current constraints. In this way, generators will reach an optimized operating point corresponding to a given and unique power flow distribution presenting the minimum power losses. The proposed approach can be particularly interesting for diesel-based islanded microgrids that face, constantly, the issue of reducing their dependency from fossil fuels and of enhancing their generation and distribution efficiency. The Glow-worm Swarm Optimization (GSO) algorithm is selected as a key heuristic tool for solving the optimization problem. The main program is carried out in Matlab environment. A case study with a parametric analysis is implemented and all results are assessed and compared with the conventional droop control method to show the effectiveness of the proposed method as well as the improved reliability of the system.

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Section: Introductionmentioning

confidence: 90%

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

et al. 2018

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“…Applying a multi-objective stochastic optimization approach to solve the optimal energy management issues in MGs has been reported in [17]. To achieve an optimized operation of an off-grid MG, nonlinear droop relations are implemented in [18]. In [19], optimal control strategy for MG under both off-grid and grid-connected mode has been studied.…”

Section: Introductionmentioning

confidence: 99%

“…For different optimal control problems mentioned in e.g., [16][17][18][19][20], a variety of optimization targets are considered to formulate the H 2 performance. For robust control problems discussed in e.g., [21][22][23][24], H ∞ performance has been focused.…”

Section: Introductionmentioning

confidence: 99%

“…As is mentioned above, some existing works only investigate either optimization of operation cost and energy management (e.g., [16][17][18][19][20]), or robustness against internal instability and external disturbances (e.g., [21][22][23][24]) of MG systems. In this paper, this is the very first time that both two aspects are considered simultaneously in the field of EI, rather than in conventional energy systems.…”

Section: Introductionmentioning

confidence: 99%

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A Class of Control Strategies for Energy Internet Considering System Robustness and Operation Cost Optimization

Hao

Qin

et al. 2018

Energies

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Aiming at restructuring the conventional energy delivery infrastructure, the concept of energy Internet (EI) has become popular in recent years. Outstanding benefits from an EI include openness, robustness and reliability. Most of the existing literatures focus on the conceptual design of EI and are lack of theoretical investigation on developing specific control strategies for the operation of EI. In this paper, a class of control strategies for EI considering system robustness and operation cost optimization is investigated. Focusing on the EI system robustness issue, system parameter uncertainty, external disturbance and tracking error are taken into consideration, and we formulate such robust control issue as a structure specified mixed H 2 /H ∞ control problem. When formulating the operation cost optimization problem, three aspects are considered: realizing the bottom-up energy management principle, reducing the cost involved by power delivery from power grid (PG) to microgrid (MG), and avoiding the situation of over-control. We highlight that this is the very first time that the above targets are considered simultaneously in the field of EI. The integrated control issue is considered in frequency domain and is solved by a particle swarm optimization (PSO) algorithm. Simulation results show that our proposed method achieves the targets.

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“…However, this technique is rarely exploited to control grid-connected inverters. The main usage of droop curves is on controlling and managing load sharing among parallel inverters connected to microgrids on the stand-alone mode [9]. Some works also use a dc voltage droop control to manage power flow on microgrid dc busses [10]- [13].…”

Section: Introductionmentioning

confidence: 99%

Procedure to Match the Dynamic Response of MPPT and Droop-Controlled Microinverters

Godoy

Bizarro²,

Andrade

et al. 2017

IEEE Trans. on Ind. Applicat.

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Due to the absence of communication needs and great reliability, the droop-control technique is a great choice for controlling of inverters that are subjected to load sharing or to work in an islanded mode. On the other hand, current-controlled inverters are often used in grid-connected systems due to their fast response to power the implementation of maximum power point tracking (MPPT) algorithms to maximize the power extracted from these systems. However, the application of such algorithms in gridconnected droop-controlled systems is hampered by differences in the dynamic responses of the respective techniques. In this context, this study presents the development of a strategy that enables a push-pull converter controlled by MPPT and a low-power plug and play grid-connected inverter governed by droop control to operate stably even under variations in solar radiation. The goal is achieved based on the following two approaches: designing the dclink capacitor properly and using a control loop in order to adapt the droop curves in accordance with the available input power. Theoretical analysis and experimental results have proven the viability of the approach.

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Construction of Nonlinear Droop Relations to Optimize Islanded Microgrid Operation

Cited by 62 publications

References 25 publications

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

A Class of Control Strategies for Energy Internet Considering System Robustness and Operation Cost Optimization

Procedure to Match the Dynamic Response of MPPT and Droop-Controlled Microinverters

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