3410

158 دكتري

دكتري

﴿مهندسي برق﴾

اصفهان: دانشگاه صنعتي اصفهان، دانشكده برق و كامپيوتر

1385

چهارده، 110، [II] ص. : مصور، نمودار

ص. ع. به فارسي و انگليسي

عليرضا بخشايي

سعيد حسين نيا، علي نبوي نياكي

حميد كارشناس، اسماعيل همداني گلشن

1396/03/01

كتابنامه

برق و كامپيوتر

مهندسي برق و كامپيوتر

ID158 دكتري

به فارسي و انگليسي : قابل رويت در نسخه ديجيتال

Abstract Better utilization of the existing ac transmission lines without risking the instability is a major challenge inpower system operation and control In many cases the instability occurs because of poor damping of poweroscillations in long distance or weak transmission lines One approach to reduce the risk of instability thusincrease the power transfer capacity is Power Oscillation Damping improvement Nowadays series FACTScontrollers such as Static Synchronous Series Compensator SSSC demonstrate superior and competitivefeatures to improve power oscillation damping Control issues of the SSSC have been addressed by a number ofresearchers Traditional linear Single Input Single Output SISO controllers design approaches such aseigenvalue eigenvector analysis and root locus are only useful when the system states remain in the vicinity of aspecific operating point In addition in most SISO approaches the dynamic interactions among control variablesand various control loops are neglected A serious issue is the dc link voltage dynamic which is assumed to beconstant in most SISO design This simplification can lead to serious problems in a practical implementation In this thesis multivariable and nonlinear controllers are proposed to improve the power oscillationdamping in a SMIB power system using SSSC Considerable interactions among the SSSC control variables andpower system variables are taken into consideration and the dc link voltage dynamic is not ignored Accordingly a nonlinear multivariable model for the SMIB power system equipped with an SSSC is developed Amultivariable controller in frequency domain is designed The proposed multivariable controller minimizes theinteractions among system variables and is less sensitive to the variation of the operating point In nonlinearsystem theory obtaining the Input Affine model for the system if possible is a critical step in the design andimplementation of many nonlinear and robust control approaches In this dissertation such a nonlinear andmultivariable input affine model for a power system installed with an SSSC is developed for the first time Next based on the developed input affine model and differential geometric approach a Multi Input Multi Output MIMO feedback linearized nonlinear controller is designed The proposed controller is employed to improvepower oscillation damping in addition to adjusting the dc link voltage of the SSSC Simulation results carried outin a PSCAD V4 1 software show the viability of the developed system model and the proposed controllers Simulation results also justify the superiority of the diagonal dominance and feedback linearization MIMOtechniques over the conventional SISO approaches in enhancing power oscillation damping and adjusting thedc link voltage Furthermore stability robustness of the proposed controllers is illustrated for a wide range ofoperating conditions variations Improving power oscillation damping for wide range of operating conditionsallows secure use of the unused line capacity and therefore increases the power transfer capacity of thetransmission system without increasing the risk of instability

عليرضا بخشايي

سعيد حسين نيا، علي نبوي نياكي

حميد كارشناس، اسماعيل همداني گلشن