Delay-dependent stability of DC Microgrid with time-varying delay

Khalil, Ashraf; Elkawafi, Salma; Elgaiyar, Anass Ibrahim; Wang, Jihong

doi:10.1109/iconac.2016.7604946

Cited by 11 publications

(3 citation statements)

References 14 publications

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“…The greater the communication delay in the system, the greater the voltage deviation and error in the controller, leading to substantial spikes [176]. In [177], the effects of communication delay on the system performance are studied. Here, the maximum allowable communication delay for a DC microgrid is computed using a mathematical model.…”

Section: Communication Challengesmentioning

confidence: 99%

A Review on Challenges in DC Microgrid Planning and Implementation

Jithin,

Purayil Haridev,

Mayadevi

et al. 2023

Journal of Modern Power Systems and Clean Energy

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DC microgrids are gaining more attention with the increased penetration of various DC sources such as solar photovoltaic systems, fuel cells, batteries, etc., and DC loads. Due to the rapid integration of these components into the existing power system, the importance of DC microgrids has reached a salient point. Compared with conventional AC systems, DC systems are free from synchronization issues, reactive power control, frequency control, etc., and are more reliable and efficient. However, many challenges need to be addressed for utilizing DC power to its full potential. The absence of natural current zero is a significant issue in protecting DC systems. In addition, the stability of the DC microgrid, which relies on inertia, needs to be considered during system design. Moreover, power quality and communication issues are also significant challenges in DC microgrids. This paper presents a review of various value streams of DC microgrids including architectures, protection schemes, power quality, inertia, communication, and economic operation. In addition, comparisons between different microgrid configurations, the state-of-the-art projects of DC microgrid, and future trends are also set forth for further studies.

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Section: Communication Challengesmentioning

confidence: 99%

A Review on Challenges in DC Microgrid Planning and Implementation

Jithin,

Purayil Haridev,

Mayadevi

et al. 2023

Journal of Modern Power Systems and Clean Energy

View full text Add to dashboard Cite

show abstract

“…Step 3: Use the binary iteration to find the crossing frequency, ω c , with a given error tolerance ω e [39,40]. We set…”

Section: Proof ([35-38])mentioning

confidence: 99%

A New Method for Computing the Delay Margin for the Stability of Load Frequency Control Systems

Khalil

Peng

2018

Energies

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Open communication is an exigent need for future power systems, where time delay is unavoidable. In order to secure the stability of the grid, the frequency must remain within its limited range which is achieved through the load frequency control. Load frequency control signals are transmitted through communication networks which induce time delays that could destabilize power systems. So, in order to guarantee stability, the delay margin should be computed. In this paper, we present a new method for calculating the delay margin in load frequency control systems. The transcendental time delay characteristics equation is transformed into a frequency dependent equation. The spectral radius was used to find the frequencies at which the root crosses the imaginary axis. The crossing frequencies were determined through the sweeping test and the binary iteration algorithm. A one-area load frequency control system was chosen as a case study. The effectiveness of the proposed method was proven through comparison with the most recent published methods. The method shows its merit with less conservativeness and less computations. The impact of the proportional integral (PI) controller gains on the delay margin was investigated. It was found that increasing the PI controller gains reduces the delay margin.

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“…Step Step 3: Use the binary iteration to find the crossing frequency, c  , with a given error tolerance e  [27,28]. We set…”

Section: Theorem 1:[24]mentioning

confidence: 99%

A New Method for Computing the Delay Margin for the Stability of Load Frequency Control Systems

Khalil¹,

Ping²

2018

Preprint

Self Cite

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The open communication is an exigent need for future power system where the time delay is unavoidable. In order to secure the stability of the grid, the frequency must remain within its limited range which is achieved through the load frequency control. The load frequency control signals are transmitted through communication networks which induces time delay that could destabilize the power systems. So, in order to guarantee the stability the delay margin should be computed. In this paper, we present a new method for calculating the delay margin in load frequency control systems. The transcendental time delay characteristics equation is transformed to frequency dependant equation. The spectral radius is used to find the frequencies at which the roots crosses the imaginary axis. The crossing frequencies are determined through the sweeping test and the binary iteration algorithm. A one-area load frequency control system is chosen as case study. The effectiveness of the proposed method has been proved through comparing with the most recent published methods. The method shows its merit with less conservativeness and less computations. The PI controller gains are preferable to be chosen large to reduce the damping, however, the delay margin decreases with increasing the PI controller gains.

show abstract

Delay-dependent stability of DC Microgrid with time-varying delay

Cited by 11 publications

References 14 publications

A Review on Challenges in DC Microgrid Planning and Implementation

A Review on Challenges in DC Microgrid Planning and Implementation

A New Method for Computing the Delay Margin for the Stability of Load Frequency Control Systems

A New Method for Computing the Delay Margin for the Stability of Load Frequency Control Systems

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