The impact of the time delay on the load frequency control system in microgrid with plug-in-electric vehicles

2017 ◽  
Vol 35 ◽  
pp. 365-377 ◽  
Author(s):  
Ashraf Khalil ◽  
Zakariya Rajab ◽  
Asma Alfergani ◽  
Omar Mohamed
Keyword(s):  
Control System ◽  
Time Delay ◽  
Electric Vehicles ◽  
Frequency Control ◽  
Load Frequency Control ◽  
Load Frequency ◽  
Frequency Control System ◽  
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.

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