ANALYSIS OF DELAY COMPENSATION METHODS IN HARDWARE-IN-THE-LOOP TESTS

2021 ◽  
pp. 100-112
Author(s):  
Eduardo Moraes Coraça ◽  
Janito Vaqueiro Ferreira
Keyword(s):  
Hardware In The Loop ◽  
Delay Compensation ◽  
Compensation Methods

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

Force-based delay compensation for hardware-in-the-loop simulation divergence of 6-DOF space contact

2017 ◽  
Vol 233 (1) ◽  
pp. 151-165
Author(s):  
Qian Wang ◽  
Chenkun Qi ◽  
Feng Gao ◽  
Xianchao Zhao ◽  
Anye Ren ◽  
...  
Keyword(s):  
Dynamic Model ◽  
Dynamic Models ◽  
Contact Process ◽  
Three Dimensional ◽  
Compensation Method ◽  
Degree Of Freedom ◽  
Hardware In The Loop ◽  
Delay Compensation ◽  
Measurement Delay ◽  
Six Degree Of Freedom

The contact process of a space docking device needs verification before launching. The verification cannot only rely on the software simulation since the contact dynamic models are not accurate enough yet, especially when the geometric shape of the device is complex. Hardware-in-the-loop simulation is a choice to perform the ground test, where the contact dynamic model is replaced by a real device and the real contact occurs. However, the Hardware-in-the-loop simulation suffers from energy increase and instability since time delay is unavoidable. The existing delay compensation methods are mainly focused on a uniaxial or three-dimensional contact. In this paper, a force-based delay compensation method is proposed for the hardware-in-the-loop simulation of a six degree-of-freedom space contact. A six degree-of-freedom dynamic model of the spacecraft motion is derived, and a six degree-of-freedom delay compensation method is proposed. The delay is divided into track delay and measurement delay, which are compensated individually. Experiment results show that the proposed delay compensation method is effective for the six degree-of-freedom space contact.

Simulation Research on Networked Control System Based on NS-2

2012 ◽  
Vol 490-495 ◽  
pp. 608-612
Author(s):  
Xiao Hui Zhang ◽  
Mu Li ◽  
Na Li
Keyword(s):  
Time Delay ◽  
Data Transmission ◽  
Networked Control System ◽  
Network Control ◽  
Delay Compensation ◽  
Simulation Research ◽  
Compensation Methods ◽  
Environment Simulation ◽  
Network Transmission ◽  
Time Delay Compensation

A key issue in NCS is network transmission. In the research of network control, in some special fields, the system performance could be evaluated based on the real-time character of data transmission in the LAN, but the result gotten in this kind of method isn’t representative. In this paper, a simulation model is firstly established via the NS-2 software under research of network transmission, and then the interval segmentation time-delay and the constant time-delay compensation methods of network control are investigated under this environment. Simulation result validates the effectiveness of the model.

scholarly journals Fast harmonic analysis for PHIL experiments with decentralized real-time controllers

2021 ◽  
Author(s):  
Erhan Sezgin ◽  
Anurag Mohapatra ◽  
Vedran S. Peric ◽  
Ozgül Salor ◽  
Thomas Hamacher
Keyword(s):  
Harmonic Analysis ◽  
Real Time ◽  
Communication Link ◽  
Hardware In The Loop ◽  
Voltage Measurement ◽  
Delay Compensation ◽  
Grid Synchronization ◽  
Point Of Common Coupling ◽  
Common Coupling ◽  
Execution Rates

<i>The paper has been submitted to PSCC 2022 and is currently awaiting reviews.<br></i><br>This paper proposes and implements, a harmonic analysis algorithm for microgrid Power Hardware-in-the-loop (PHIL) experiments, when the point of common coupling (PCC) voltage cannot be directly wired to the local prosumer controllers due to long distances between them. Using frequency-shifting and filtering ideas, the voltage measurement is converted to magnitude and phase information. This is passed over an asynchronous communication link to another controller, where it is recovered into a waveform after delay compensation. The method allows for accurate power calculations and grid synchronization over distributed prosumer controllers. The proposed method can work at different execution rates depending on real time (RT) workload and is shown to be robust against step changes, harmonics and communication delays. The method is demonstrated with two PHIL experiments at the CoSES, TU Munich lab in grid connected and island mode.

scholarly journals Model-Independent Derivative Control Delay Compensation Methods for Power Systems

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 342 ◽  
Author(s):  
Muyang Liu ◽  
Ioannis Dassios ◽  
Georgios Tzounas ◽  
Federico Milano
Keyword(s):  
Power Systems ◽  
New England ◽  
Delay System ◽  
Open Loop ◽  
System Stability ◽  
Small Signal Stability ◽  
Delay Compensation ◽  
Compensation Methods ◽  
The Stability ◽  
Derivative Control

The paper examines the effectiveness of utilizing the derivatives of time delayed, wide-area signals in mitigating their destabilizing impact on power system dynamic response. In particular, the paper discusses two derivative control-based delay compensation methods, namely proportional-derivative (PD) and predictor-based delay compensation. The two methods are compared in terms of their open-loop signal fidelity and their impact on the closed-loop system stability. The paper also provides a technique to carry out small-signal stability analysis with inclusion of derivative control based compensation, which leads to a Neutral Time-Delay System (NTDS). In addition, we provide a new theorem on the stability of the NTDS. Finally, nonlinear time domain simulations and eigenvalue analysis based on the IEEE 14-bus and New England 39-bus systems were carried out for the sake of comparison of the two delay compensation methods.

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