Delay-dependent stability of LFC in Microgrid with varying time delays

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

doi:10.1109/iconac.2016.7604945

Cited by 18 publications

(8 citation statements)

References 12 publications

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“…This article investigates a delay dependent stability under deregulated environment. Here, a single delay is considered before the controller, which is generated due to loss of synchronism among solar‐wind‐thermal power plant, different nonlinearity (thermal power plant) and communication between large interconnected hybrid system and it is denoted by an exponential term

e^{- s τ_{d}}

, 6,37 where

τ_{d}

represents total counted time delay in the system.…”

Section: Methods Of Approach Of the Proposed System Including Delay I...mentioning

confidence: 99%

Development of MADB of P‐I controller using LMI technique in a renewable energy based AGC system and study its application in a deregulated environment including energy storage device

Biswas

Roy

Chatterjee

2021

Optim Control Appl Methods

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In recent decades, inclusion of renewable resources is considered as one of the most promising options for the long run uninterrupted power supply without depending on conventional resources. Thus, the renewable energy generation will get more attention and massive growing, so that the goal of 40% share of electricity in the worldwide energy portfolio in 2050 would be realized. But during replacement of renewable energy by conventional energy, engineers are facing a lot of problem due to solar generation, wind generation change their characteristic rapidly with weather condition, which may cause large synchronizing imbalance between different units and generate large system delay or communication delay in large interconnected grid. In this article, the authors propose linear matrix inequalities techniques to developed margin of allowable delay for delay dependent stable hybrid system. Initially, to judge the efficacy of proposed chaotic atomic search optimization (CASO) algorithm over other evolutionary algorithms with PID controller, a thermal‐hydro gas system is considered. The second part of this article is motivated by the fact that proposed CASO algorithm with P‐I controller is superior in contrast to bacterial foraging algorithm technique. In addition to this, some energy storage devices such as fuel cell, aqua electrolyzer, and ultra‐capacitor are used to achieve a better dynamic response within specified delay margin. Moreover, to study the impact of communication delays (delay margin) due to the loss of synchronism between solar‐wind (for their unpredicted environmental features) and thermal unit (nonlinearities like generation rate constraints, boiler dynamics, and governor with the dead band) are considered in thermal unit and the simulation results verify with the effectiveness of the proposed approach on providing a balance between the delay margin and the damping performances is evaluated under deregulated environment. The simulation results help to make an inter‐relation between the delay margin and the controller gain (P‐I) which help the system operator in designing controllers gain for stable operation of the proposed hybrid system.

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e^{- s τ_{d}}

, 6,37 where

τ_{d}

represents total counted time delay in the system.…”

Section: Methods Of Approach Of the Proposed System Including Delay I...mentioning

confidence: 99%

Development of MADB of P‐I controller using LMI technique in a renewable energy based AGC system and study its application in a deregulated environment including energy storage device

Biswas

Roy

Chatterjee

2021

Optim Control Appl Methods

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show abstract

“…Variable delay can lead to system instability when transferring data in the communication network. The authors of [132] investigate the stability of the LFC system in an islanded microgrid with a time delay. The authors of [133] propose to solve the problem of LFC in a restructured electrical system through a fuzzy controller based on bee mating optimization (HBMOF).…”

Section: Lfc and Deregulationmentioning

confidence: 99%

A Comprehensive Review of Load Frequency Control Technologies

Rasolomampionona,

Połecki,

Zagrajek

et al. 2024

Energies

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Load frequency control (LFC) is one of the most important tools in power system control. LFC is an auxiliary service related to the short-term balance of energy and frequency of power systems. As such, it allows the acquisition of a central role in enabling electricity exchanges and providing better conditions. The classification of LFC can be carried out from different angles: we can enumerate, among others, the type of control used. The following types of control are presented in this review: classical, optimal, and robust control. More advanced controls can also be used for classification: fuzzy logic control, ANN control, genetic algorithms, PSO control, etc. The influence of renewables and power control tools like FACTS is also considered as a category to be analyzed. The last classifications are related to two important subjects—the influence of DC links on LFC efficiency and the dangers of cyberattacks on the LFC.

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“…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

Self Cite

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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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Delay-dependent stability of LFC in Microgrid with varying time delays

Cited by 18 publications

References 12 publications

Development of MADB of P‐I controller using LMI technique in a renewable energy based AGC system and study its application in a deregulated environment including energy storage device

Development of MADB of P‐I controller using LMI technique in a renewable energy based AGC system and study its application in a deregulated environment including energy storage device

A Comprehensive Review of Load Frequency Control Technologies

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

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