DC micro grid small signal stability analysis

Karimi, Amin; Pirayesh, Abolfazl; Aghdam, Tohid Soleymani; Ajalli, Majid

doi:10.1109/epdc.2013.6565958

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…These modes are characterized by low-frequency modes, mainly determined by the droop controllers of the DG unit. It was also reported that oscillatory conditions depend on the parameters of converters and controllers, line impedance, and load [53]. Low-frequency modes are dictated mainly by the power-sharing controllers and the power filters [49,52].…”

Section: Small-signal Stability In Microgridmentioning

confidence: 99%

Small-Signal Stability and Resonance Perspectives in Microgrid: A Review

et al. 2023

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The microgrid (MG) system is a controlled and supervised power system consisting of renewable energy (RE)-based distributed generation (DG) units, loads, and energy storage. The MG can be operated autonomously or while connected to the grid. Higher intermittencies and uncertainties can be observed in MGs compared to the conventional power system, which is the possible source of small-signal stability in MG systems. It can be seen as disturbances around the stable operating point, which potentially lead to the small-signal instability problem within MGs. Small-signal instability issues also emerge due to the lack of damping torque in the MG. The integration of power electronic devices and complex control algorithms within MGs introduces novel challenges in terms of small-signal stability and possible resonances. The occurrence of interaction in a low- or no-inertia system might worsen the stability margin, leading to undamped oscillatory instability. The interaction within the MG is characterized by various frequency ranges, from low-frequency subsynchronous oscillation to high-frequency ranges around the harmonic frequencies. This study presents an overview of the dynamic model, possible sources of small-signal instability problems, and resonance phenomena in MGs. The developed models of MG, including structure, converter-based power generation, and load and control algorithms, are briefly summarized to provide the context of MG system dynamics. A comprehensive critical review of the previous research, including small-signal stability and resonance phenomenon for MGs, is also provided. Finally, key future research areas are recommended.

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Section: Small-signal Stability In Microgridmentioning

confidence: 99%

Small-Signal Stability and Resonance Perspectives in Microgrid: A Review

et al. 2023

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“…However, as a main component in dc microgrid, the voltage controlled converter in [12] is replaced by an equivalent dc source, which may eliminate many unstable factors. A droop based dc microgrid has been discussed in [13]- [14]. Both of them have taken the effect of connecting cable impedances into consideration.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of a DC microgrid with master-slave control structure

Guo

Feng

et al. 2014

2014 IEEE Energy Conversion Congress and Exposition (ECCE)

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Nowadays there is an increasing interest on dc microgrid for its higher energy efficiency and higher reliability as compared to the ac system. This paper addresses the stability problem in a dc microgrid with master-slave control structure. Considering the discrete sampling and control algorithm in a digital system, the small-signal models of this dc microgrid have been derived in the z plane. Eigenvalue analysis results show that the system stability and transient response will be affected by the variation of the dc load parameters, the number of slave distributed generations (DGs), and the type of dc load. A centralized oscillation suppression controller, which is composed of a proportional compensator followed by a bandpass filter, is proposed to overcome the unstable oscillations caused by different eigenvalues. The validity of the proposed approach is confirmed by simulations. I.978-1-4799-5776-7/14/$31.00 ©2014 IEEE

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“…It is known that, in general, load characteristics together with DG characteristics may influence the stability of a network [1].As shown in AC power systems, different loads have different characteristics and thus their influences on system stability are different. However, as to DC microgrids, loads characteristics and their influences are still uncertain while recent research simply considers a single type of loads [2]- [4]. Manuscript In AC systems, loads are usually modelled by Polynomial Load Model or Exponential Load Model [5] to describe the relationship between load capacity and voltage.…”

Section: Introductionmentioning

confidence: 99%

Small-signal modeling and stability analysis of DC microgrid with multiple type of loads

Zhao

Yin

et al. 2014

2014 International Conference on Power System Technology

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DC microgrid is an efficient solution for integration of multiple Distributed Generations (DGs) and loads. The stability of DC system can be influenced by different kinds of loads. In this paper, the small signal model is established for DC microgrid with multi-type of loads. Lyapunov Stability Theory is applied to investigate the dynamic stability of DC microgrid. Traces of eigenvalues demonstrate that high portion of Constant Power Loads (CPL) may bring negative effect to DC microgrid while Constant Current Loads (CCL) has little influence.

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DC micro grid small signal stability analysis

Cited by 5 publications

References 11 publications

Small-Signal Stability and Resonance Perspectives in Microgrid: A Review

Small-Signal Stability and Resonance Perspectives in Microgrid: A Review

Stability analysis of a DC microgrid with master-slave control structure

Small-signal modeling and stability analysis of DC microgrid with multiple type of loads

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