Accurate Reactive Power Sharing in an Islanded Microgrid Using Adaptive Virtual Impedances

Mahmood, Hisham; Michaelson, Dennis; Jiang, Jin

doi:10.1109/tpel.2014.2314721

Cited by 384 publications

(229 citation statements)

References 33 publications

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“…The DG local controller adopts the proposed voltage droop control method in accordance with Equ. (7).…”

Section: A Proposed Control Strategymentioning

confidence: 99%

“…However, the conventional droop control method is subjected to inherent limitations of power sharing. Although real power-frequency droop (P-f droop) can share real power accurately, reactive power sharing with reactive power-voltage amplitude droop (Q-V droop) is sensitive to DG output impedance and transmission line impedance [5]- [7]. In practical microgrids, feeders may have both non-trivial inductive and resistive components.…”

Section: Introductionmentioning

confidence: 99%

“…In practical microgrids, feeders may have both non-trivial inductive and resistive components. The different distances among DG units lead to mismatch in the physical impedance of the feeders, thereby resulting in significant reactive power circulation [7].…”

Section: Introductionmentioning

confidence: 99%

“…However, this control scheme cannot eliminate sharing errors. In [7], the reactive power references obtained from the central energy management system are used to tune the adaptive virtual impedance, which can compensate for the mismatch in voltage drops across feeders. The method proposed in [17] utilizes low-bandwidth synchronization flag signals to activate a compensation stage for both real and reactive power sharing.…”

Section: Introductionmentioning

confidence: 99%

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Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Guo¹,

Wu²,

Lin³

et al. 2016

Journal of Power Electronics

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Owing to mismatched feeder impedances in an islanded microgrid, the conventional droop control method typically results in errors in reactive power sharing among distributed generation (DG) units. In this study, an improved droop control strategy based on secondary voltage control is proposed to enhance the reactive power sharing accuracy in an islanded microgrid. In a DG local controller, an integral term is introduced into the voltage droop function, in which the voltage compensation signal from the secondary voltage control is utilized as the common reactive power reference for each DG unit. Therefore, accurate reactive power sharing can be realized without any power information exchange among DG units or between DG units and the central controller. Meanwhile, the voltage deviation in the microgrid common bus is removed. Communication in the proposed strategy is simple to implement because the information of the voltage compensation signal is broadcasted from the central controller to each DG unit. The reactive power sharing accuracy is also not sensitive to time-delay mismatch in the communication channels. Simulation and experimental results are provided to validate the effectiveness of the proposed method.

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“…The DG local controller adopts the proposed voltage droop control method in accordance with Equ. (7).…”

Section: A Proposed Control Strategymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Guo¹,

Wu²,

Lin³

et al. 2016

Journal of Power Electronics

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show abstract

“…The second category is the virtual impedance-based decoupling control [14][15][16][17][18]. Through introducing a virtual inductance and subtracting its voltage drop at the input side of the voltage loop, the system impedance can be adjusted for power decoupling.…”

Section: Introductionmentioning

confidence: 99%

Power Decoupling Method Based on the Diagonal Compensating Matrix for VSG-Controlled Parallel Inverters in the Microgrid

Zhou

2017

Energies

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Abstract:The thought of the virtual synchronous generator (VSG) for controlling the grid-connected inverters and providing virtual inertia to the microgrid is emerging as a wide extension of the droop control, power coupling that always exists in the low-voltage microgrid, which may deteriorate the dynamic response and the stability of the system. In this paper, the principle of VSG control is introduced first. As an important issue of VSG control, the mechanism of the power coupling in the low-voltage microgrid is analyzed and the small-signal equivalent model of the power transmission loop is established. Subsequently, a power decoupling method based on the diagonal compensating matrix for VSG is proposed, which can realize the power decoupling with no impact on the original control channel. Meanwhile, the feasibility analysis of the decoupling method and the improved approach for reactive power sharing are also discussed. Simulation results verify the effectiveness of the decoupling strategy for VSGs.

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Microgrids Stability

2023

Microgrids

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Accurate Reactive Power Sharing in an Islanded Microgrid Using Adaptive Virtual Impedances

Cited by 384 publications

References 33 publications

Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Power Decoupling Method Based on the Diagonal Compensating Matrix for VSG-Controlled Parallel Inverters in the Microgrid

Microgrids Stability

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