scholarly journals Modified Quasi-Steady State Model of DC System for Transient Stability Simulation under Asymmetric Faults

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Jun Liu ◽  
Zhanhong Wei ◽  
Wanliang Fang ◽  
Chao Duan ◽  
Junxian Hou ◽  
...  
Keyword(s):  
Steady State ◽  
Transient Stability ◽  
State Model ◽  
Calculation Error ◽  
Half Cycle ◽  
Quasi Steady State ◽  
Dc Voltage ◽  
Dc System ◽  
Steady State Model ◽  
Negative Effect

As using the classical quasi-steady state (QSS) model could not be able to accurately simulate the dynamic characteristics of DC transmission and its controlling systems in electromechanical transient stability simulation, when asymmetric fault occurs in AC system, a modified quasi-steady state model (MQSS) is proposed. The model firstly analyzes the calculation error induced by classical QSS model under asymmetric commutation voltage, which is mainly caused by the commutation voltage zero offset thus making inaccurate calculation of the average DC voltage and the inverter extinction advance angle. The new MQSS model calculates the average DC voltage according to the actual half-cycle voltage waveform on the DC terminal after fault occurrence, and the extinction advance angle is also derived accordingly, so as to avoid the negative effect of the asymmetric commutation voltage. Simulation experiments show that the new MQSS model proposed in this paper has higher simulation precision than the classical QSS model when asymmetric fault occurs in the AC system, by comparing both of them with the results of detailed electromagnetic transient (EMT) model of the DC transmission and its controlling system.

DEM-based virtual experimental blast furnace: A quasi-steady state model

2017 ◽  
Vol 314 ◽  
pp. 557-566 ◽  
Author(s):  
Qinfu Hou ◽  
Dianyu E ◽  
Shibo Kuang ◽  
Zhaoyang Li ◽  
A.B. Yu
Keyword(s):  
Blast Furnace ◽  
Steady State ◽  
State Model ◽  
Quasi Steady State ◽  
Steady State Model

scholarly journals A Quasi-Steady State Model of a Singularly Perturbed Wind Turbine with an Induction Generator and Nonlinear Frictions: A Bond Graph Approach

2020 ◽  
Vol 2020 ◽  
pp. 1-26
Author(s):  
Aaron Padilla-Garcia ◽  
Gilberto Gonzalez-Avalos ◽  
Noe Barrera-Gallegos ◽  
Gerardo Ayala-Jaimes
Keyword(s):  
Steady State ◽  
Nonlinear Systems ◽  
Wind Turbine ◽  
Bond Graph ◽  
Singularly Perturbed ◽  
State Model ◽  
Induction Generator ◽  
Quasi Steady State ◽  
State Variables ◽  
Steady State Model

The modelling in bond graph of a class of nonlinear systems with singular perturbations is presented. The class of nonlinear systems modelled by bond graphs is defined by the product of state variables and nonlinear dissipation elements. In order to obtain the mathematical model of the singularly perturbed nonlinear systems, a lemma based on the junction structure of the bond graph with a preferred integral causality assignment is proposed. The quasi-steady state model of the system is obtained by assigning a derivative causality to the storage elements for the fast dynamics and an integral causality to the storage elements for the slow dynamics. The proposed methodology to a wind turbine connected to an induction generator is applied. Simulation results of the exact and reduced models of this case study are shown.

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