An Impedance-Power Droop Method for Accurate Power Sharing in Islanded Resistive Microgrids

Razi, Reza; Iman‐Eini, Hossein; Hamzeh, Mohsen

doi:10.1109/jestpe.2019.2926319

Cited by 28 publications

(26 citation statements)

References 27 publications

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“…In the impedance-power droop method, the concept of virtual impedance is also used in the structure of a new algorithm [24]. In this method, the effect of inherent impedances on power sharing is minimized to the extent possible by using a suitable feedforward signal.…”

Section: Impedance-power Droop Methodsmentioning

confidence: 99%

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Robust hybrid control of parallel inverters for accurate power-sharing in microgrid

Razi

Pham

Hably

et al. 2020

2020 IEEE International Conference on Industrial Technology (ICIT)

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The communication link, low reliability, inaccurate power sharing and voltage and frequency deviations are some challenges in control methods of parallel inverters in high voltage microgrids. This paper proposes a hybrid control method using the impedancepower droop and conventional droop methods. In the proposed hybrid method, the impedance-power droop method works as the main strategy in steady state and the conventional droop method is employed as auxiliary strategy during startup and transient states. The notable advantages of the proposed method are low virtual impedances, no need for recognition of system parameters, simple and low calculations. Moreover, the voltage deviation in the steady state is minimized and the frequency deviation is completely eliminated. Finally, the performance of the control method is validated by simulation.

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Section: Impedance-power Droop Methodsmentioning

confidence: 99%

“…Finally, this method is capable of performing accurate active, reactive, and harmonic power sharing with little voltage change and without frequency deviation [24]. However, dependence on the communication link and compromise between speed and accuracy are the disadvantages of this method.…”

Section: Impedance-power Droop Methodsmentioning

confidence: 99%

Robust hybrid control of parallel inverters for accurate power-sharing in microgrid

Razi

Pham

Hably

et al. 2020

2020 IEEE International Conference on Industrial Technology (ICIT)

Self Cite

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“…The output voltage and the virtual flux of the inverter at k th sampling instant in the complex α − β frame are achieved using Equations ( 3) and (19). The virtual flux amplitude of the inverter and the angular difference between the inverter and the common bus virtual flux vectors have to be predicted.…”

Section: Prediction Mechanismmentioning

confidence: 99%

“…The line impedances can be reshaped to be purely inductive or resistive by incorporating virtual impedance. In this regard, an improved method was proposed in [19,20]. However, the value determination of the virtual impedances in different conditions is difficult.…”

Section: Introductionmentioning

confidence: 99%

A Novel Power Sharing Strategy Based on Virtual Flux Droop and Model Predictive Control for Islanded Low-Voltage AC Microgrids

et al. 2021

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The droop control scheme based on Q − ⍵ and P − V characteristics is conventionally employed to share the load power among sources in an islanded low-voltage microgrid with resistive line impedances. However, it suffers from poor active power sharing, and is vulnerable to sustained deviations in frequency and voltage. Therefore, accurate power sharing and maintaining the frequency and voltage in the desired ranges are challenging. This paper proposes a novel microgrid control strategy to address these issues. The proposed strategy consists of a virtual flux droop and a model predictive control, in which the virtual flux is the time integral of the voltage. Firstly, the novel virtual flux droop control is proposed to accurately control the power sharing among DGs. Then, the model predictive flux control is employed to generate the appropriate switching signals. The proposed strategy is simple without needing multiple feedback control loops. In addition, pulse width modulation is not required and tuning challenges for PI regulators are avoided. In order to evaluate the effectiveness of the proposed microgrid control strategy, simulation analysis is carried out in Matlab/Simulink software environment. The results show that accurate power sharing is achieved while a good dynamic response is provided. Furthermore, the voltage and frequency deviations are significantly improved.

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“…In this method, a positive virtual resistance to strengthen the feeder resistance is introduced; a negative virtual inductance to counteract the line inductance can realize power decoupling. In [9], a control scheme is proposed to eliminate the inherent impedance of the converter, thus making the line impedance the only factor affecting the powersharing. In [10], virtual impedance, having a positive resistive component and a negative inductive component, was employed to improve the accuracy of active power-sharing.…”

Section: Introductionmentioning

confidence: 99%

An Improved Virtual Inertia Control Strategy for Low Voltage AC Microgrids with Hybrid Energy Storage Systems

et al. 2022

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This paper proposes a novel virtual inertia control (VIC) method based on a feedforward decoupling strategy to address the low inertia issue of power-converter-interfaced microgrids. The feedforward control scheme is employed to eliminate the coupling between active and reactive power caused by line impedance. The active power-voltage droop can be applied to the battery converter in the hybrid energy storage system (HESS). A novel VIC method is developed for the supercapacitor (SC) converter of HESS to increase the inertia of the microgrid. Detailed small-signal modeling of the SC converter with the proposed VIC was conducted, and the transfer function model was obtained. Parameter analysis of the virtual inertia and virtual damping was carried out with the pole-zero map method, and the step response characteristic of output voltage amplitude with power variation was analyzed in detail, deriving the parameter design principle. The simulation study verifies the effectiveness and validity of the proposed control strategy. The proposed feedforward decoupling method and VIC can be widely applied in microgrids to enhance inertia and improve their power quality.

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An Impedance-Power Droop Method for Accurate Power Sharing in Islanded Resistive Microgrids

Cited by 28 publications

References 27 publications

Robust hybrid control of parallel inverters for accurate power-sharing in microgrid

Robust hybrid control of parallel inverters for accurate power-sharing in microgrid

A Novel Power Sharing Strategy Based on Virtual Flux Droop and Model Predictive Control for Islanded Low-Voltage AC Microgrids

An Improved Virtual Inertia Control Strategy for Low Voltage AC Microgrids with Hybrid Energy Storage Systems

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