Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Guo, Qian; Wu, Hongyan; Lin, Liaoyuan; Bai, Zhihong

doi:10.6113/jpe.2016.16.1.329

Cited by 13 publications

(7 citation statements)

References 28 publications

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“…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]. This scheme inserts an integral term into the voltage droop function in which the voltage compensation signal from the secondary voltage control is utilized as the reactive power reference.…”

Section: Droop Control Conceptmentioning

confidence: 99%

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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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Section: Droop Control Conceptmentioning

confidence: 99%

“…A secondary voltage control scheme was proposed for reactive power sharing in islanded microgrid [24]. This scheme inserts an integral term into the voltage droop function in which the voltage compensation signal from the secondary voltage control is utilized as the reactive power reference.…”

mentioning

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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“…The stability and dynamic performance of a system with the IM-P and IM-PQ methods are analyzed and compared with the small-signal state-space model following the modeling approach in [14], [28].…”

Section: B Dynamic and Stability Performancementioning

confidence: 99%

An Enhanced Power Sharing Strategy for Islanded Microgrids Considering Impedance Matching for Both Real and Reactive Power

Lin¹,

Guo²,

Bai³

2017

Journal of Power Electronics

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There exists a strong coupling between real and reactive power owing to the complex impedances in droop based islanded microgrids (MGs). The existing virtual impedance methods consider improvements of the impedance matching for sharing of the voltage controlled power (VCP) (reactive power for Q-V droop, and real power for P-V droop), which yields a 1-DOF (degree of freedom) tunable virtual impedance. However, a weak impedance matching for sharing of the frequency controlled power (FCP) (real power for P- droop, and reactive power for Q- droop) may result in FCP overshoots and even oscillations during load transients. This in turn results in VCP oscillations due to the strong coupling. In this paper, a 2-DOF tunable adaptive virtual impedance method considering impedance matching for both real and reactive power (IM-PQ) is proposed to improve the power sharing performance of MGs. The dynamic response is promoted by suppressing the coupled power oscillations and power overshoots while realizing accurate power sharing. In addition, the proposed power sharing controller has a better parametric adaptability. The stability and dynamic performances are analyzed with a small-signal state-space model. Simulation and experimental results are presented to investigate the validity of the proposed scheme.

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“…However, when considering the voltage deviations introduced by both the V-Q droop controller and the voltage drop on the equivalent impedance, the PCC voltage may be smaller than the minimum allowable value as illustrated in injected into the microgrid. Therefore, the droop controller should be improved to consider the PCC voltage deviation by using a second-level control scheme with communication [20]- [23] or the proposed communicationless method as elaborated in the next Section.…”

Section: B Pcc Voltage Deviation Under a Droop Control Scheme With Amentioning

confidence: 99%

“…Secondary frequency and voltage control via distributed averaging was proposed in [22], which uses localized information and nearest-neighbor communication to perform secondary control actions. An improved droop control strategy based on secondary voltage control was proposed in [23], where information on the voltage compensation signal is broadcasted from a central controller to each of the DG units. It has been demonstrated that the hierarchical control scheme can effectively restore the PCC voltage deviation.…”

Section: Introductionmentioning

confidence: 99%

A Communicationless PCC Voltage Compensation Using an Improved Droop Control Scheme in Islanding Microgrids

Ding¹,

Gao²,

Li³

et al. 2017

Journal of Power Electronics

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This paper proposes a point of common coupling (PCC) voltage compensation method for islanding microgrids using an improved power sharing control scheme among distributed generators (DGs) without communication. The PCC voltage compensation algorithm is implemented in the droop control scheme to reduce the PCC voltage deviation produced by the droop controller itself and the voltage drop on the line impedance. The control scheme of each individual DG unit is designed to use only locally measured feedback variables and an obtained line impedance to calculate the PCC voltage. Therefore, traditional voltage measurement devices installed at the PCC as well as communication between the PCC and the DGs are not required. The proposed control scheme can maintain the PCC voltage amplitude within an allowed range even to some extent assuming inaccurate line impedance parameters. In addition, it can achieve proper power sharing in islanding microgrids. Experimental results obtained under accurate and inaccurate line impedances are presented to show the performance of the proposed control scheme in islanding microgrids.

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Secondary Voltage Control for Reactive Power Sharing in an Islanded Microgrid

Cited by 13 publications

References 28 publications

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

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

An Enhanced Power Sharing Strategy for Islanded Microgrids Considering Impedance Matching for Both Real and Reactive Power

A Communicationless PCC Voltage Compensation Using an Improved Droop Control Scheme in Islanding Microgrids

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