Dynamic adaptation of droop control curves for microgrid connected inverters with variable input power

Carniato, Leonardo A.; Godoy, Ruben Barros; Pinto, J.O.P.; Canesin, Carlos A.; Ribeiro, P. E. M. J.

doi:10.1109/cobep.2013.6785240

Cited by 5 publications

(4 citation statements)

References 8 publications

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“…Another research study adopted the same methodology to regulate the active power flow following the frequency values at no load to reduce the fuel cost of DGs [19]. A dynamic power sharing method for minimum operation costs is mentioned in [20]. However, results are just focused on the sharing of power to attain minimum operational cost without considering frequency limitations.…”

Section: Introductionmentioning

confidence: 99%

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: 99%

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

et al. 2018

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“…In order to build a microgrid, where the inverters can be controlled by droop control curves either in stand-alone mode or grid-connected mode, Godoy et al [1] has proposed choices for the slope of the curves that governs the power transfer through an evolutionary algorithm with the objective of optimizing the dynamic response. Complementarily, Carniato et al [20] have used the evolutionary algorithm together with artificial neural networks to find the optimized parameters of the droop control curves for each possible operating point in order to ensure the stability as well as reduced settling time and damped response free of overshoot. Furthermore, Arafat et al [6] proposed a transition controller strategy to perform transition between standalone operation mode and grid-connected operation mode, both using droop-control strategy.…”

Section: Introductionmentioning

confidence: 99%

“…The kind of microgrid proposed in [20] can handle multimodal energy sources and its inverters are controlled by the droop-control technique. The great advantage of using the droop control in grid-connected mode is that the inverters will always be controlled by a single control technique, switching only the control reference according to the operation mode.…”

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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“…Some control solutions are reported in the literature to implement parallel operation of microgrid inverters (MGIs) in both grid-connected and islanded modes without communication lines. The conventional droop method is often used to realize voltage regulation and frequency control in [2][3][4][5][6]. The virtual synchronous generator (VSG) method has been used to reproduce the static and dynamic properties of a real synchronous generator (SG) on a MGI in [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A dynamic voltage transient suppression control strategy for microgrid inverter

Zhang

Liu

et al. 2014

2014 International Power Electronics and Application Conference and Exposition

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China Machinery Industry Standard (CMIS) GB/T 12326-2008 prescribed in the islanded operation mode, microgrid inverter (MGI) output voltage dynamic transient range is less than 10% when the resistive load is switched rapidly between 0% and 100%. The three-loop power virtual synchronous generator (VSG) control methods are commonly used in MGI units to share the loads among the parallel MGIs. However, the transient output voltage of the MGI is beyond the CMIS when the resistive load steps sharply. In order to meet the CMIS, an output voltage differential feedback improved algorithm was employed. Comparing to the traditional control method, the improved method could obtain satisfying dynamic transient voltage suppression, resonance inhibition and improve system stability. These theoretical findings were eventually verified experimentally both on simulation and laboratory prototypes.

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Dynamic adaptation of droop control curves for microgrid connected inverters with variable input power

Cited by 5 publications

References 8 publications

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids

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

A dynamic voltage transient suppression control strategy for microgrid inverter

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