Small signal stability analysis of a hybrid AC/DC microgrid with static and dynamic loads

Ahmed, Moudud; Vahidnia, Arash; Meegahapola, Lasantha; Datta, Manoj

doi:10.1109/aupec.2017.8282414

Cited by 10 publications

(7 citation statements)

References 18 publications

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“…However, this mode is more sensitive to inductance. Mode (11,12) is a low frequency mode which has a high damping ratio. Large capacitance value can move this mode to right side and result in instability.…”

Section: B Eigenvalue Sensitivity To C Dc and L Pvmentioning

confidence: 99%

“…While the stability of individual ac and dc grids is wellestablished, few studies have discussed stability issues of hybrid microgrid. The impact of static and dynamic loads on a hybrid grid stability is presented in [11]. The complete model is obtained by combining the individual models of ac and dc grids but the stability of ILC is ignored.…”

Section: Introductionmentioning

confidence: 99%

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Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration

et al. 2019

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This paper presents small signal stability analysis of a hybrid microgrid from three different aspects. First, a generalized droop control of interlinking converter (ILC) is proposed which defines voltage and frequency droops at its terminals to achieve a bidirectional, autonomous power flow between grids. The impact of the droop gains on the stability is discussed and an operational range is defined for a stable system operation. Second, contrary to previous literature which have modeled the ac and dc grids by ideal sources and converters, the ac grid in this scheme is represented as a second-order synchronous generator and the dc grid is modeled as a PV system so as to analyze the dc grid dynamics in detail. It is observed that the dc link capacitor and inductor filter can lead to large system oscillations which can compromise stability. Third, the stability of the hybrid grid is analyzed from the aspect of short circuit ratio (SCR). Both rectifier and inverter mode of operation are used to understand how stability is affected with strength of ac grid. The time-domain simulations in PSCAD are used to confirm the validity of results obtained in frequency domain.

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Section: B Eigenvalue Sensitivity To C Dc and L Pvmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration

et al. 2019

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“…Hence, maintaining the stability of the hybrid AC/DC microgrid under autonomous mode is an enormous challenge. Many research studies on small‐signal stability of hybrid AC/DC microgrids have been carried out considering static and dynamic loads [7–9]. These studies have reported that the load dynamics have a significant influence on low‐frequency modes.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the droop gain of the VSC determines the power sharing and stability of the hybrid AC/DC microgrid, where a small droop gain will improve the stability margin of the microgrid. Although a small droop gain improves the stability of the microgrid, the power sharing performance of the VSC will be deteriorated [7–9].…”

Section: Introductionmentioning

confidence: 99%

Analysis and mitigation of low‐frequency oscillations in hybrid AC/DC microgrids with dynamic loads

Ahmed

Meegahapola

Vahidnia

et al. 2019

IET Generation, Transmission & Distribution

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“…The LCL filter parameters, inner current and outer voltage controllers affect the medium and the high-frequency oscillation modes, whereas droop controller parameters and load demand affect the low-frequency oscillation (LFO) modes. To study the stability of a hybrid AC/DC microgrid with the induction motor (IM) load, a small-signal stability analysis has been conducted in [9]. According to the study, IMs significantly influence the dynamic performance & stability of the entire hybrid AC/DC microgrid and have introduced LFO modes.…”

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confidence: 99%

An Adaptive Power Oscillation Damping Controller for a Hybrid AC/DC Microgrid

et al. 2020

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High penetration of dynamic loads, such as induction motors (IMs) could give rise to sustained voltage/frequency and power oscillations in hybrid AC/DC microgrids during disturbances. Majority of the published literature has investigated these stability issues with aggregated models of IMs in hybrid AC/DC microgrids, which do not properly reflect the actual dynamics of parallel operating IMs; hence, power oscillation damping (POD) controllers must be designed explicitly considering various oscillations induced by parallel operating IMs. This paper proposes an adaptive neuro-fuzzy inference system (ANFIS) based POD controller to damp low-frequency oscillations (LFOs) induced by IMs in hybrid AC/DC microgrids. The proposed supplementary POD controller was embedded to the energy storage system (ESS) controller, which provides additional damping power proportional to the frequency deviation. The following two features namely: 1) ability to adjust the gain based on the frequency deviation, and 2) ability to handle more non-linearity in the system dynamics, make the proposed adaptive ANFIS based POD controller more unique compared to conventional POD controllers. The effectiveness of the proposed ANFIS-POD controller is verified using non-linear dynamic simulations considering a range of disturbances in a hybrid AC/DC microgrid and different combinations of parallel operating IMs. Results indicate improved oscillatory stability performance in the hybrid AC/DC microgrid with the proposed ANFIS-POD controller. INDEX TERMS Adaptive neuro-fuzzy inference system (ANFIS), hybrid AC/DC microgrid, induction machine (IM), low frequency oscillations (LFOs), power oscillation damping (POD) controller. NOMENCLATURE

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Small signal stability analysis of a hybrid AC/DC microgrid with static and dynamic loads

Cited by 10 publications

References 18 publications

Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration

Small-Signal Analysis of a Hybrid Microgrid With High PV Penetration

Analysis and mitigation of low‐frequency oscillations in hybrid AC/DC microgrids with dynamic loads

An Adaptive Power Oscillation Damping Controller for a Hybrid AC/DC Microgrid

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