Identification of Small-Signal Dynamic Faults in Distribution Systems Utilizing Intelligent Classifiers

2020 ◽  
Author(s):  
Ali Jafarian Abianeh ◽  
Majid Hosseini ◽  
Matin Hosseini ◽  
Masoud Barati ◽  
Farzad Ferdowsi
Keyword(s):  
Distribution Systems ◽  
Small Signal ◽  
Dynamic Faults ◽  
Signal Dynamic

scholarly journals Modelling and Simulation for Small Signal Stability of Multi-machine Power System under Various Disturbance Conditions

2020 ◽  
Vol 4 (1) ◽  
Author(s):  
Ohnmar Swe
Keyword(s):  
Power System ◽  
Time Domain ◽  
Test System ◽  
Small Signal ◽  
Time Domain Simulation ◽  
Small Signal Stability ◽  
Signal Stability ◽  
Rotor Angle ◽  
Network Fault ◽  
Signal Dynamic

This paper presents the small signal stability of multi-machine power system over the 58-Bus, 26-Machine, Yangon Distribution Network and is validated with MATLAB software under various disturbance conditions. Time-domain solution analysis is employed to determine the small signal dynamic behavior of test system. Transtability model is used to perform time-domain simulation in SIMULINK. The simulation is carried out for normal condition, reference voltage of regulator (Vref) disturbance, mechanical torque (Tm)disturbance and network (fault) disturbance and the conditions of change in center of inertia for rotor angle (delta COI),  slip for center of inertia (slip COI), field current and mechanical torque are observed. According to the simulation results, perturbation of Vref shows only instability on the system. But ramping of Tm and network disturbance can cause large disturbance on the system and unstable conditions can be observed.

scholarly journals Small-Signal Stability Criteria in AC Distribution Systems—A Review

Electronics ◽  
2019 ◽  
Vol 8 (2) ◽  
pp. 216 ◽  
Author(s):  
Atta Rahman ◽  
Irtaza Syed ◽  
Mukhtar Ullah
Keyword(s):  
Stability Analysis ◽  
Distribution Systems ◽  
Phase System ◽  
Small Signal ◽  
Small Signal Stability ◽  
Distribution Grid ◽  
Signal Stability ◽  
Synchronous Reference Frame ◽  
Nyquist Stability ◽  
Analytical Tools

AC distribution grid is prone to instability due to negative impedance and constant power nature of the load if it is dominant with power electronics-based components. There are various time-domain and frequency-domain modelling methods which use various methodologies and analytical tools. Also, there are many small-signal stability analysis (SSSA) methods and their different variants for different specific conditions and situation. This paper presents a review of SSSA methods in AC distribution grid using impedance-based models in a synchronous reference frame (SRF). By simplifying and converting the system into load and source subsystem, the impedances of both subsystems are determined by perturbation method. For a single-phase system, Hilbert transform can be used to derive the equivalent SRF model. Afterwards, the Nyquist stability criterion can be used for stability analysis.

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