Adaptive Wide-Area Damping Control Scheme for Smart Grids with Consideration of Signal Time Delay

Cai, Guowei; Yang, Deyou; Liu, Cheng

doi:10.3390/en6094841

Cited by 15 publications

(3 citation statements)

References 27 publications

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“…This can make a particular local generator group dominate the overall system oscillation, which can make even a small disturbance affect the whole system to be unstable. When such a global oscillation occurs, adaptive wide-area damping control can be effective [16]. Therefore, when system oscillation is analyzed by the sync of low-frequency oscillations, it is possible to determine the stability margin of the overall system.…”

Section: Discussionmentioning

confidence: 99%

Synchronization of Low-Frequency Oscillation in Power Systems

2017

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Section: Discussionmentioning

confidence: 99%

Synchronization of Low-Frequency Oscillation in Power Systems

2017

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“…The possibility of retrieving the system model is appealing, but these methods are characterized by high computational burden. The order of the equivalent model, in fact, can be very high, since it is strictly dependent on the extension of the electrical system [9]. Moreover, the obtained equivalent model is valid for a limited time interval because of the constant evolution of the network topology.…”

Section: Approaches Available In Literaturementioning

confidence: 99%

An Optimized HT-Based Method for the Analysis of Inter-Area Oscillations on Electrical Systems

et al. 2019

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The paper deals with a novel method to measure inter-area oscillations, i.e., electromechanical oscillations involving groups of generators geographically distant from one another and ranging within the frequency interval from 0.1 Hz up to 1 Hz. The estimation of the parameters characterizing inter-area oscillations is a crucial objective in order to take the necessary actions to avoid the instability of the transmission electrical system. The proposed approach is a signal-based method, which uses samples of electrical signals acquired by the phasor measurement unit (PMU) and processes them to extract the individual oscillations and, for each of them, determine their characteristic parameters such as frequency and damping. The method is based on Hilbert transformations, but it is optimized through further algorithms aiming at (i) improving the ability to separate different oscillatory components, even at frequencies very close to each other, (ii) enhancing the accuracy associated with the damping estimates of each oscillation, and (iii) increasing the robustness to the noise affecting the acquired signal. Results obtained in the presence of signals involving the composition of two oscillations, whose damping and frequency have been varied, are presented. Tests were conducted with signals either synthesized in simulated experiment or generated and acquired with actual laboratory instrumentation.

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“…The major innovation of this paper is the delay margin calculation method which can evaluate the impact of delay and apply it to the design of a wide-area damping controller (WADC) with a faster calculation speed. Cai [12] deduced a low-order linearized model containing time-delay by using the subspace identification technique. Inter-area modes can be identified to obtain participation factors.…”

Section: Introductionmentioning

confidence: 99%

Eigen-Analysis Considering Time-Delay and Data-Loss of WAMS and ITS Application to WADC Design Based on Damping Torque Analysis

Zhou

Zhong

et al. 2018

Energies

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Data-loss from wide-area measurement systems (WAMS) is a stochastic event and eigenvalues of power systems containing data-loss cannot be calculated directly. This paper proposes a unified model of WAMS data containing time-delay and data-loss according to its mathematical expectation. Based on Pade approximation, the model is incorporated into a system linearized model with WAMS. Thus, an eigen-analysis can be conducted to analyze the impacts of data corruption and to calculate the system stability time-delay margin. Then, the unified model is applied to damping torque analysis (DTA) to derive the damping torque index (DTI) with WAMS. The DTI can be used to select feedback signals and conduct the parameter design of a wide-area damping controller (WADC). Finally, the 2-area 4-machine (2A4M) Kundur system and Eastern China power grid (ECPG) are simulated to validate the feasibility of the model and its application. The results demonstrate the impacts of data corruption on system dynamic performance and the ability of the method to improve the small-signal stability of interconnected power grids.

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Adaptive Wide-Area Damping Control Scheme for Smart Grids with Consideration of Signal Time Delay

Cited by 15 publications

References 27 publications

Synchronization of Low-Frequency Oscillation in Power Systems

Synchronization of Low-Frequency Oscillation in Power Systems

An Optimized HT-Based Method for the Analysis of Inter-Area Oscillations on Electrical Systems

Eigen-Analysis Considering Time-Delay and Data-Loss of WAMS and ITS Application to WADC Design Based on Damping Torque Analysis

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