scholarly journals Direct Method-Based Transient Stability Analysis for Power Electronics-Dominated Power Systems

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Yanbo Che ◽  
Zihan Lv ◽  
Jianmei Xu ◽  
Jingjing Jia ◽  
Ming Li
Keyword(s):  
Stability Analysis ◽  
Power Systems ◽  
Power Electronics ◽  
Transient Stability ◽  
Direct Method ◽  
System Modeling ◽  
System Stability ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Transient Stability Analysis

With the extensive application of power electronics interfaced nonsynchronous energy sources (NESs) in modern power systems, the system stability especially the transient stability is prominently deteriorated, and it is crucial to find a comprehensive and reasonably simple solution. This paper proposes a direct method-based transient stability analysis (DMTSA) method which concludes the key steps as follows: (1) the system modeling of Lyapunov functions using mixed potential function theory and (2) the stability evaluation of critical energy estimation. A voltage source converter- (VSC-) based HVDC transmission system is simulated in a weak power grid to validate the proposed DMTSA method under various disturbances. The simulation results verify that the proposed method can effectively estimate the transient stability with significant simplicity and generality, which is practically useful to secure the operation and control for power electronics-dominated power systems.

A Direct Method for Transient Stability Analysis of Power Systems with Detailed Models

1988 ◽  
Vol 15 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Peter W. Sauer ◽  
Anup K. Behera ◽  
M. A. Pai ◽  
James R. Winkelman ◽  
Joe H. Chow
Keyword(s):  
Stability Analysis ◽  
Power Systems ◽  
Transient Stability ◽  
Direct Method ◽  
A Direct Method ◽  
Transient Stability Analysis

scholarly journals Quasi-Z-Source Inverter-Based Photovoltaic Power System Modeling for Grid Stability Studies

Energies ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 508
Author(s):  
Lluís Monjo ◽  
Luis Sainz ◽  
Juan José Mesas ◽  
Joaquín Pedra
Keyword(s):  
Power Systems ◽  
Power System ◽  
System Modeling ◽  
Power Conversion ◽  
System Stability ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Stability Problems ◽  
Sensitivity Studies ◽  
And Control

Quasi-Z-source inverters (qZSIs) are becoming a powerful power conversion technology in photovoltaic (PV) power systems because they allow energy power conversion in a single stage operation. However, they can cause system resonances and reduce system damping, which may lead to instabilities. These stability problems are well known in grid-connected voltage source converter systems but not in quasi-Z-source inverter (qZSI)-based PV power systems. This paper contributes with Matlab/Simulink and PSCAD/EMTDC models of qZSI-based PV power systems to analyze transient interactions and stability problems. These models consider all power circuits and control blocks of qZSI-based PV power systems and can be used in sensitivity studies on the influence of system parameters on stability. PV power system stability is assessed from the proposed models. The causes of instabilities are analyzed from numerical simulations and possible solutions are proposed.

Transient stability analysis and control of power systems with considering flux decay by energy function approach

2012 ◽  
Vol 60 (1) ◽  
pp. 3-8
Author(s):  
D. Lu ◽  
X. Zhang
Keyword(s):  
Stability Analysis ◽  
Power Systems ◽  
Energy Function ◽  
Transient Stability ◽  
Stability Boundary ◽  
Function Approach ◽  
Fault System ◽  
Rotor Angle ◽  
And Control ◽  
Transient Stability Analysis

Transient stability analysis and control of power systems with considering flux decay by energy function approach In this paper, transient stability of power systems with structure preserving models is considered. A Hamiltonian function which can be regarded as a Lyapunov function for the system is proposed. Based on this, the influence of flux decay dynamics, especially during a fault, on transient stability is analyzed. With the increase of load power, the variation of stability boundary in the rotor angle/E'q plane is shown. The Energy-based excitation control, aiming at injecting additional damping into the post-fault system may reduce the critical clearing time (CCT). This can be demonstrated by the comparison of different flux decay dynamics in the fault-on condition, and the reason is illustrated by the relationship between rotor angle/E'q and the stability boundary. An improved control strategy is proposed and applied to increase the CCT. Simulation results verify that improvement is obtained both in transient stability and dynamic performance.

Sign in / Sign up

Export Citation Format

Share Document