The Impact of Electric Vehicles Aggregator on the Stability Region of Micro-Grid System with Communication Time Delay

2019 ◽  
Author(s):  
Hakan Gunduz ◽  
Sahin Sonmez ◽  
Saffet Ayasun
Keyword(s):  
Time Delay ◽  
Electric Vehicles ◽  
Stability Region ◽  
Grid System ◽  
Communication Time ◽  
Micro Grid ◽  
The Stability ◽  
The Impact

Impact of electric vehicles aggregators with communication delays on stability delay margins of two-area load frequency control system

2021 ◽  
pp. 014233122110144
Author(s):  
Ausnain Naveed ◽  
Şahin Sönmez ◽  
Saffet Ayasun
Keyword(s):  
Time Delay ◽  
Electric Vehicles ◽  
Characteristic Equation ◽  
Frequency Control ◽  
Analytical Formula ◽  
Load Frequency Control ◽  
System Stability ◽  
Load Frequency ◽  
Communication Time ◽  
The Impact

This paper investigates the impact of electric vehicles (EVs) aggregator with communication time delay on stability delay margin of a two-area load frequency control (LFC) system. A frequency-domain exact method is used to calculate stability delay margins for various values of proportional-integral (PI) controller gains. The proposed method first eliminates the transcendental terms in the characteristic equation without using any approximation and then transforms the transcendental characteristic equation into a regular polynomial using a recursive approach. The key result of the elimination process is that real roots of the new polynomial correspond to imaginary roots of the transcendental characteristic equation. With the help of new polynomial, delay-dependent system stability and root tendency with respect to the time delay is determined. An analytical formula is then developed to compute delay margins in terms of system parameters. The qualitative impact of EVs aggregator on stability delay margins is thoroughly analysed and the results are verified by time domain simulations and quasi-polynomial mapping-based root finder (QPmR) algorithm.

Analysis of the impact of the processing time-delay on the stability of a digital GMI magnetometer

2021 ◽  
Author(s):  
Papa Silly Traore ◽  
Serge Konan ◽  
Aktham Asfour ◽  
Jean-Paul Yonnet
Keyword(s):  
Time Delay ◽  
Processing Time ◽  
The Stability ◽  
The Impact

An Efficient Approach for Stability Analysis and Parameter Tuning in Delayed Feedback Control of a Flying Robot Carrying a Suspended Load

2019 ◽  
Vol 141 (8) ◽  
Author(s):  
Wei Dong ◽  
Ye Ding ◽  
Luo Yang ◽  
Xinjun Sheng ◽  
Xiangyang Zhu
Keyword(s):  
Time Delay ◽  
Feedback Control ◽  
Spectral Radius ◽  
Stability Region ◽  
Parameter Tuning ◽  
Suspended Load ◽  
Delayed Feedback ◽  
Delayed Feedback Control ◽  
The Stability ◽  
Flying Robot

This paper presents an accurate and computationally efficient time-domain design method for the stability region determination and optimal parameter tuning of delayed feedback control of a flying robot carrying a suspended load. This work first utilizes a first-order time-delay (FOTD) equation to describe the performance of the flying robot, and the suspended load is treated as a flying pendulum. Thereafter, a typical delayed feedback controller is implemented, and the state-space equation of the whole system is derived and described as a periodic time-delay system. On this basis, the differential quadrature method is adopted to estimate the time-derivative of the state vector at concerned sampling grid point. In such a case, the transition matrix between adjacent time-delay duration can be obtained explicitly. The stability region of the feedback system is thereby within the unit circle of spectral radius of this transition matrix, and the minimum spectral radius within the unit circle guarantees fast tracking error decay. The proposed approach is also further illustrated to be able to be applied to some more sophisticated delayed feedback system, such as the input shaping with feedback control. To enhance the efficiency and robustness of parameter optimization, the derivatives of the spectral radius regarding the parameters are also presented explicitly. Finally, extensive numeric simulations and experiments are conducted to verify the effectiveness of the proposed method, and the results show that the proposed strategy efficiently estimates the optimal control parameters as well as the stability region. On this basis, the suspended load can effectively track the pre-assigned trajectory without large oscillations.

scholarly journals A Study on an Out-of-Step Detection Algorithm Using the Time Variation of Complex Power: Part I, Mathematical Modeling

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4065
Author(s):  
You-Jin Lee ◽  
Jeong-Yong Heo ◽  
O-Sang Kwon ◽  
Chul-Hwan Kim
Keyword(s):  
Transmission Lines ◽  
Smart Grids ◽  
Detection Algorithm ◽  
Grid System ◽  
Step Detection ◽  
Power Swing ◽  
Complex Power ◽  
Power Part ◽  
Micro Grid ◽  
The Stability

Power quality and stability have become the most important issues in power system operations, Micro Grids, and Smart Grids. Sensitive equipment can be seriously damaged when exposed to unstable power swing conditions. An unstable system may cause serious damage to Micro Grid System elements such as generators, transformers, transmission lines, and so forth. Therefore, out-of-step detection is essential for the safe operation of a Micro Grid system. In general, Equal Area Criterion (EAC) is a method for evaluating the stability of Smart Grid systems. However, EAC can be performed only if it is possible to analyze the active power and generator angle. This paper presents an analysis of the trajectory of complex power using a mathematical model. The variation of complex power is analyzed using a mathematical method, and then the relationship between complex power and EAC is presented, and a simulation performed. Later, in part II, a novel out-of-step detection algorithm based on part I will be presented and tested.

scholarly journals Networked Control of Electric Vehicles for Power System Frequency Regulation with Random Communication Time Delay

Energies ◽  
2017 ◽  
Vol 10 (5) ◽  
pp. 621 ◽  
Author(s):  
Yunpeng Guo ◽  
Liyan Zhang ◽  
Junhua Zhao ◽  
Fushuan Wen ◽  
Abdus Salam ◽  
...  
Keyword(s):  
Time Delay ◽  
Power System ◽  
Electric Vehicles ◽  
Networked Control ◽  
Frequency Regulation ◽  
Communication Time ◽  
System Frequency

scholarly journals Design of PI controller for Liquid Level System using Siemens Distributed Control System

2019 ◽  
Vol 8 (3) ◽  
pp. 2783-2789
Keyword(s):  
Time Delay ◽  
Stability Region ◽  
Dead Time ◽  
Pi Controller ◽  
Liquid Level ◽  
Order System ◽  
System Response ◽  
Level System ◽  
Geometric Center ◽  
The Stability

The PI controller design for a liquid level system using the weighted geometric center method is discussed. Every real-time process have dead time. This dead time leads to the generation of oscillation in the system response. The oscillation generated due to dead time introduces instability in system performance. This paper presents a tuning method based on calculating a geometric center in the stability region for a higher order system. In this, the stability region calculated by plotting (Kp , Ki )-plane based on boundary locus stability technique. Further centre point computed in the stability locus by a geometric center method. This center point will provide Kp , Ki value for tuning the PI controller. The First Order Plus Dead Time (FOPDT) process considered to elaborate the method for computing the tuning parameters. A nonlinear time-delay system and a plant having time-delay response are controlled in simulation. The performance of the newly obtained PI controller based on weighted geometric center method is compared with the existing results to show the usefulness of the control scheme. Moreover, disturbance rejection ability of the newly obtained PI controller based on weighted geometric center method is demonstrated by applying disturbances. In addition, the designed controller implemented using Siemens DCS PCS7 V8.1 platform.

scholarly journals Impact of micro hydro power plants on transient stability for the micro grid 20 kV system

2021 ◽  
Vol 24 (3) ◽  
pp. 1278
Author(s):  
Syarifuddin Nojeng ◽  
Syamsir Syamsir ◽  
Reny Murniati
Keyword(s):  
Power Plant ◽  
Power System ◽  
Electric Power ◽  
Transient Stability ◽  
Interconnection Network ◽  
Electric Power System ◽  
Hydro Power ◽  
Micro Grid ◽  
The Stability ◽  
The Impact

Transient stability analysis is conducted to determine the ability of the electric power system in maintaining the operating stability after a major disturbance. The disturbance can be trigger an impact on the stability of the rotor angle, voltage, and system frequency which can cause loss of synchronization. In this paper, the impact of the interconnection of the Tombolo-Pao mini hydro power plant (MHPP) on the stability of the system was analyzed by several scenarios to determine the behavior of system parameters in a 20 kV system interconnection network. This research is an implementation of regulatory provisions relating to the study of the connection to the PLN distribution network through by regulator. Based on the result of simulation study, transient stability of generators at TomboloPao power plant about 0.1 second, will not occur with network configuration according to modeling activation of anti-islanding protection of Tombolo Pao Power Plant which is set by 2 second. The simulation results show that the location of the disturbance in the electric power system has been influenced by the behavior of the power plant (synchronous generator) which can lead to the instability of the micro-hydro connected to the micro-grid system 20 kV.

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