Robust stabilization of load frequency control system under networked environment

Khalil, Ashraf; Wang, Jihong; Mohamed, Omar

doi:10.1007/s11633-016-1041-z

Cited by 26 publications

(15 citation statements)

References 22 publications

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“…The impact of communication time delay on automatic generation control (AGC) performance and frequency regulation has been analysed in [11][12][13]. Lately, the impact of the signal delay on the deregulated AGC has found significant interest [14,15]. In a competitive market to supply an effective AGC ancillary service, an open communication infrastructure is highly needed.…”

Section: Realistic Load Frequency Control (Lfc) In Competitive Enviromentioning

confidence: 99%

Modified group search optimisation‐based comparative performance evaluation of thyristor controlled series capacitor‐based fractional order damping controllers to improve load frequency control performance in restructured environment

Morsali

Zare

Hagh

2017

IET Generation, Transmission & Distribution

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Section: Realistic Load Frequency Control (Lfc) In Competitive Enviromentioning

confidence: 99%

Modified group search optimisation‐based comparative performance evaluation of thyristor controlled series capacitor‐based fractional order damping controllers to improve load frequency control performance in restructured environment

Morsali

Zare

Hagh

2017

IET Generation, Transmission & Distribution

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“…The time delays in the communication links induced into the power systems are within the range of a few milliseconds to one hundred milliseconds depending on the communication network type used, the transmission protocol, network load, and other factors [3,4]. The time delay is in the order of a few seconds in the load frequency control systems [5,6]. The presence of the time delay could lead to poor system performance, or at worst, system instability.…”

Section: Introductionmentioning

confidence: 99%

An Accurate Method for Delay Margin Computation for Power System Stability

Khalil

Peng

2018

Energies

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The application of the phasor measurement units and the wide expansion of the wide area measurement units make the time delay inevitable in power systems. The time delay could result in poor system performance or at worst lead to system instability. Therefore, it is important to determine the maximum time delay margin required for the system stability. In this paper, we present a new method for determining the delay margin in the power system. The method is based on the analysis in the s-domain. The transcendental time delay characteristics equation is transformed to a frequency dependent equation. The spectral radius is used to find the frequencies at which the roots cross the imaginary axis. The crossing frequencies are determined through the sweeping test and the binary iteration algorithm. A single machine infinite bus system equipped with automatic voltage regulator and power system stabilizer is chosen as a case study. The delay margin is calculated for different values of the power system stabilizer (PSS) gain, and it is found that increasing the PSS gain decreases the delay margin. The effectiveness of the proposed method has been proved through comparing it with the most recent published methods. The method shows its merit with less conservativeness and fewer computations.

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“…In order to achieve these tasks the automatic generation control (AGC) signals are sent through dedicated communication links, and if this link fails, voice communication through telephone lines is used [2]. To guarantee uniform frequency in multi-area power systems, the area control error (ACE) and the generator control error (GCE) signals are distributed between the different areas [3]. Since the control signals are exchanged over communication networks, the time delay is inevitable, especially if the open communications are adopted in the power system [4].…”

Section: Introductionmentioning

confidence: 99%

“…This period is usually selected to be very conservative which is determined from experience. The delay margin is also very important in determining the upper bound for the sampling time and aiding the control designer in the tuning [3,8]. In this paper, we present an accurate method for computing the delay margin for LFC systems.…”

Section: Introductionmentioning

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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Robust stabilization of load frequency control system under networked environment

Cited by 26 publications

References 22 publications

Modified group search optimisation‐based comparative performance evaluation of thyristor controlled series capacitor‐based fractional order damping controllers to improve load frequency control performance in restructured environment

Modified group search optimisation‐based comparative performance evaluation of thyristor controlled series capacitor‐based fractional order damping controllers to improve load frequency control performance in restructured environment

An Accurate Method for Delay Margin Computation for Power System Stability

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

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