A Voltage and Frequency Droop Control Method for Parallel Inverters

Brabandere, K. De; Bolsens, B.; Keybus, Jeroen Van den; Woyte, Achim; Driesen, Johan; Belmans, Ronnie

doi:10.1109/tpel.2007.900456

Cited by 1,495 publications

(543 citation statements)

References 12 publications

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“…A method to realize droop control by controlling active and reactive currents was proposed in [36]. The key merit of this control method is that the system is incapable of yielding infinitely impulse current when short circuit occurs (…”

Section: Reactive Power Sharing Based On Reactive Current Controlmentioning

confidence: 99%

Adaptive Virtual Impedance Droop Control Based on Consensus Control of Reactive Current

et al. 2018

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It is difficult to achieve accurate distribution of reactive power based on conventional droop control due to the line impedance mismatch in an islanded microgrid. An adaptive virtual impendence method based on consensus control of reactive current is proposed in this paper. A distributed control structure without the central controller has been established. In this structure, each distributed generation unit (DG) is an independent agent, one-way communication is used between the adjacent DGs, and the reactive power sharing is equivalent to a problem of reactive power current consensus. It has been proven that the system is asymptotically stable under the proposed control strategy. When the adjacent DG's reactive power is not proportionally distributed, the current weight error term will generate a virtual impedance correction term through the proportional-integral controller based on the reactive current consensus control strategy, thus introducing adaptive virtual impedance to eliminate mismatches in output impedance between DGs. Reactive power auto-proportional distribution can be achieved without knowing the line impedance. At the same time, the power control loop is simplified and the virtual impedance compensation angle is employed to compensate the decreased reference voltage magnitude and varied phase angle due to the introduction of the virtual impedance, so the stability of the system can be improved. Finally, the correctness and effectiveness of the proposed strategy are verified by modeling analysis and microgrid simulations.

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Section: Reactive Power Sharing Based On Reactive Current Controlmentioning

confidence: 99%

Adaptive Virtual Impedance Droop Control Based on Consensus Control of Reactive Current

et al. 2018

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“…Thus, if the output current is mixed with high frequency noises, noise amplification will occur which could deteriorate the control stability. An improved droop control scheme was proposed for reactive power sharing in islanded microgrids, which uses the error reduction operation by low-bandwidth synchronization signal and the voltage recovery operation to compensate the voltage reduction due to the error reduction operation [11,12]. A secondary voltage control scheme was proposed for reactive power sharing in islanded microgrid [24].…”

Section: Droop Control Conceptmentioning

confidence: 99%

A New Reactive-Power Sharing Scheme for Two Inverter-Based Distributed Generations with Unequal Line Impedances in Islanded Microgrids

et al. 2017

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This paper proposes a new reactive-power sharing scheme to reduce the circulating current when two inverter-based distributed generations (DGs) operate in parallel through unequal line impedances in an islanded microgrid. If the terminal voltages of the two DGs are not equal due to the unequal line impedances, a circulating current due to reactive-power unbalance occurs, which increases system loss. The proposed droop control compensates the terminal voltage difference to reduce the circulating current by considering a feed-forward path of the line voltage drop. The feasibility of the proposed droop control was first verified through computer simulations, and then experiments with a hardware set-up in the lab. The experimental results were compared with the simulation results to confirm the feasibility of the proposed droop control.

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“…The power imbalance is a common scenario in MGs, being caused by the discontinuity in the energy generation or by the changes in the power demand. Nowadays, adequate strategies have been developed to manage the power dispatch in the MGs, which can be: centralized, decentralized or distributed [12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…According to [1], some decentralized control strategies based on the droop method [20] do not need the implementation of a communications system and provide the plug and play function of DG units. Nevertheless, a communication system is necessary for monitoring the power dispatch in the MG so that the power dispatch can be optimized and the status of each power unit can be known [17].…”

Section: Introductionmentioning

confidence: 99%

Practical Analysis and Design of a Battery Management System for a Grid-Connected DC Microgrid for the Reduction of the Tariff Cost and Battery Life Maximization

et al. 2018

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This study is focused on two areas: the design of a Battery Energy Storage System (BESS) for a grid-connected DC Microgrid and the power management of that microgrid. The power management is performed by a Microgrid Central Controller (MGCC). A Microgrid operator provides daily information to the MGCC about the photovoltaic generation profile, the load demand profile, and the real-time prices of the electricity in order to plan the power interchange between the BESS and the main grid, establishing the desired state of charge (SOC) of the batteries at any time. The main goals of the power management strategy under study are to minimize the cost of the electricity that is imported from the grid and to maximize battery life by means of an adequate charging procedure, which sets the charging rate as a function of the MG state. Experimental and simulation results in many realistic scenarios demonstrate that the proposed methodology achieves a proper power management of the DC microgrid.

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A Voltage and Frequency Droop Control Method for Parallel Inverters

Cited by 1,495 publications

References 12 publications

Adaptive Virtual Impedance Droop Control Based on Consensus Control of Reactive Current

Adaptive Virtual Impedance Droop Control Based on Consensus Control of Reactive Current

A New Reactive-Power Sharing Scheme for Two Inverter-Based Distributed Generations with Unequal Line Impedances in Islanded Microgrids

Practical Analysis and Design of a Battery Management System for a Grid-Connected DC Microgrid for the Reduction of the Tariff Cost and Battery Life Maximization

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