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Modeling for Thyristor Controlled Series Capacitor

Author: WangYiFei
Tutor: MaoZhiZhong
School: Northeastern University
Course: Control Theory and Control Engineering
Keywords: Flexible AC Transmission Systems TCSC Control Model
CLC: TM762
Type: Master's thesis
Year: 2005
Downloads: 329
Quote: 3
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Abstract


Flexible AC Transmission Systems ( FACTS ) technology has broad application prospects in the power system is one of the topics at the forefront of the power system studies in recent years . Controlled series compensation ( TCSC ) is an important member of the FACTS family , its simple structure, low cost, and have the ability to improve the power line transmission and improve the performance of the system stability . Therefore , TCSC research is relatively large theoretical significance and practical value . TCSC for the study, carried out the study of the following aspects : the establishment of a model of the TCSC steady state impedance , and the impedance characteristics of the analysis . The study found that , if the inductive reactance and capacitive reactance of the ratio is greater than 1 / 9 , the TCSC have a stable shape to read the resonant point , according to the trigger angle of the work area is divided into two parts : one is the inductive region , and the other is capacitive work area . If the ratio of inductive reactance and capacitive reactance of less than 1/9, the steady state more than one resonant point . Same time, by the dynamic equation is obtained across the TCSC harmonic voltage and analysis of TCSC harmonic characteristics . The study found that large harmonic voltage when the following two conditions are met : a capacitance and inductance than 3 to 2,5 to 2,7 to 2 ...... ; another is the square root of the ratio of capacitance and inductance with the conduction angle multiplied by 1/2 is an odd multiple of pi / 2 . In addition, through the establishment of sub-synchronous current and synchronous voltage relationship principle of TCSC inhibition of sub-synchronous oscillation ( SSR ) . Computer simulation studies have shown that , TCSC SSR does have a positive inhibition . TCSC control model on the basis of the analysis of the characteristics , based on the relationship between the firing angle inductor current . Work in the capacitive region , the gain of the model varies with the change of the trigger angle size . According to the firing angle , the capacitive area of work is divided into two sub-areas : a sub- region of the response is monotonic , and the other is a damped oscillation . The computer simulation results show that when the input phase , the model output and consistent system response .

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CLC: > Industrial Technology > Electrotechnical > Transmission and distribution engineering, power network and power system > Power system automation > Automatic control of electrical equipment
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