scholarly journals Latencies in Power Systems: A Database-Based Time-Delay Compensation for Memory Controllers

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 208
Author(s):  
Alexander Molina-Cabrera ◽  
Mario A. Ríos ◽  
Yvon Besanger ◽  
Nouredine Hadjsaid ◽  
Oscar Danilo Montoya
Keyword(s):  
Time Delay ◽  
Power Systems ◽  
Time Delays ◽  
Closed Loop ◽  
Control Strategies ◽  
Area Measurement ◽  
Delay Compensation ◽  
Measurement Systems ◽  
Tie Lines ◽  
Time Delay Compensation

Time-delay is inherent to communications schemes in power systems, and in a closed loop strategy the presence of latencies increases inter-area oscillations and security problems in tie-lines. Recently, Wide Area Measurement Systems (WAMS) have been introduced to improve observability and overcome slow-rate communications from traditional Supervisory Control and Data Acquisition (SCADA). However, there is a need for tackling time-delays in control strategies based in WAMS. For this purpose, this paper proposes an Enhanced Time Delay Compensator (ETDC) approach which manages varying time delays introducing the perspective of network latency instead dead time; also, ETDC takes advantage of real signals and measurements transmission procedure in WAMS building a closed-loop memory control for power systems. The strength of the proposal was tested satisfactorily in a widely studied benchmark model in which inter-area oscillations were excited properly.

scholarly journals A deterministic approach for design of supervisory control of LPV systems with delay

PLoS ONE ◽  
2021 ◽  
Vol 16 (8) ◽  
pp. e0256408
Author(s):  
Ch. Nauman Zahid ◽  
Mina Salim ◽  
Raja Ali Riaz ◽  
Jamshed Iqbal
Keyword(s):  
Time Delay ◽  
Supervisory Control ◽  
Closed Loop ◽  
Control Structure ◽  
Real Life ◽  
Pressure Control ◽  
Smith Predictor ◽  
Delay Compensation ◽  
Lpv Systems ◽  
Time Delay Compensation

Linear Parameter Varying (LPV) systems and their control have gained attraction recently as they approximate nonlinear systems with higher order than ordinary linear systems. On the other hand, time delay is an inherent part of various real-life applications. A supervisory control structure is proposed in this paper for LPV systems subject to time delays. In the proposed control structure, a supervisor selects the most suitable controller from a bank of controllers; which desires to enhance the performance of closed-loop system in contrast with using a single robust controller. The analysis is based on the celebrated Smith predictor for time delay compensation and we provide a sufficient condition to assure the stability of the closed-loop switched system in terms of dwell time. Simulations on blood pressure control of hypertension patients in postoperative scenario are used to exemplify the effectiveness of the utilized technique. The operating region of the system is partitioned into five smaller operating regions to construct corresponding robust controllers and perform hysteresis switching amongst them. Simulation results witnessed that the proposed control scheme demonstrated a pressure undershoot less than the desired value of 10 mmHg while the Mean Arterial Pressure (MAP) remains within ±5 mmHg of the desired value.

Time Delay Compensation and Stability Issues in Teleoperation

2000 ◽  
Author(s):  
Carmen M. Caradima ◽  
David W. Wang
Keyword(s):  
Time Delay ◽  
Time Delays ◽  
Research Area ◽  
Haptic Device ◽  
Delay Compensation ◽  
Haptic Devices ◽  
Time Delay Compensation ◽  
The Stability ◽  
Stability Issues ◽  
Unknown Time Delays

Abstract The stability of teleoperation over the Internet is a growing research area. The unknown time delays of the data transmission, however, compromise performance and stability. It is assumed in this work that force information is not available which is the case for most commercial haptic devices. This paper examines two approaches to this challenging problem. The first approach focuses on using Kalman filters to predict, at the local haptic device, the present state of the remote haptic device. In this way, the time delays can be made to seem as if they did not exist. Simulation results are presented on experimental data to verify this technique. The second approach is to employ haptic devices which are mechanically designed to have linear dynamics. It is shown that our proposed feedback configuration is stable for all gains, up to a maximum time delay which can be precomputed. Experimental results are presented.

Time Delay Compensation for Closed-Loop Insulin Delivery Systems: A Simulation Study

1991 ◽  
Vol 14 (6) ◽  
pp. 350-358 ◽  
Author(s):  
G.P. Reboldi ◽  
P.D. Home ◽  
G. Calabrese ◽  
P.G. Fabietti ◽  
P. Brunetti ◽  
...  
Keyword(s):  
Time Delay ◽  
Simulation Study ◽  
Closed Loop ◽  
Insulin Delivery ◽  
Delivery Systems ◽  
Delay Compensation ◽  
Time Delay Compensation

RobustH∞Damping Control of Multi-FACTS Devices for Stability Enhancement of Power Systems with Signal’s Time Delay

2015 ◽  
Vol 19 (2) ◽  
pp. 239-246
Author(s):  
Fang Liu ◽  
◽  
Min Wu ◽  
Danyun Li ◽  
Yong He ◽  
...  
Keyword(s):  
Time Delay ◽  
Robust Control ◽  
Power Systems ◽  
Area Measurement ◽  
Measurement Systems ◽  
Damping Control ◽  
Facts Devices ◽  
Stability Enhancement ◽  
Delay Dependent ◽  
Damping Controller

In this paper, a robustH∞damping controller of multi-FACTS device for a power system is developed with considering the time delay of the remote feedback signals transmitted by wide-area measurement systems (WAMS). A free-weighting matrices method based on linear control design approach is presented to design the robustH∞damping controller to improve the dynamical performance of power systems. Firstly, the linearized reduced-order plant model is established, which efficiently considers the signal’s time delay and disturbance. Then, the design of multi-FACTS robustH∞damping controller is formulated as the standard control problem on delay-dependent state-feedback robust control based on the robust control theory. Finally, the simulation tests are carried out on the 2-area 4-machine power systems. Satisfactory test results verify the correctness of the proposed damping controller.

Designing Time Delay Compensation Methods for Functional Modes Using Sensory Evaluation

2015 ◽  
Vol 135 (7) ◽  
pp. 755-764 ◽  
Author(s):  
Shuhei Shimizu ◽  
Yoshiki Ohno ◽  
Takahiro Nozaki ◽  
Kouhei Ohnishi
Keyword(s):  
Time Delay ◽  
Sensory Evaluation ◽  
Delay Compensation ◽  
Compensation Methods ◽  
Time Delay Compensation
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