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A THREE-LEVEL INVERTER-BASED STATIC VAR COMPENSATOR

ABSTRACT

 In this thesis, the principles of operation, modeling and analysis of an advanced static VAr compensator (ASVC) which employs a neutral-point-clamped (NPC), three-level pulse-width modulation (PWM), voltage source inverter (VSI), have been investigated. For the three-level inverter, output terminal voltages vary between +Vdc/2 and 0 or –Vdc/2 and 0, whereas in the conventional PWM inverter output voltage vary between +Vdc/2 and –Vdc/2. Thus, the blocking voltage of each switching device in three-level inverter is one half of dc-link voltage, whereas it is full dc-link voltage for two-level inverter. The harmonics content of three-level inverter output voltage is far less than that of the two-level inverter at the same switching frequency. The three-level inverter can therefore be operated at lower switching frequency without excessive harmonic content. And so, it has lower switching losses and higher efficiency. It is suitable for high-voltage and high-power applications The principles of operation of various types of power system static VAr compensators are first reviewed, including their specific applications in power systems. Using d-q reference frame transformation, a mathematical model for the compensator is derived and analyzed to obtain the dynamic and steady-state characteristics. Two types of analyses carried out include phase angle control of the ASVC and simultaneous application of phase angle and modulation index of the switching pattern as control variables. Results obtained show that the proposed ASVC is stable and has low harmonics content. It requires small filter / reactive elements and hence it is economical and efficient. To improve the speed of response of the ASVC to system conditions, a Proportional-plus-Integral (PI) controller is usually employed in the control strategy. A PI controller has thus been designed and applied. A design example of the ASVC is also carried out to demonstrate its application. The software - implementation of these analyses is in the Matlab environment.

Project detailsContents
 
Number of Pages124 pages
Chapter one Introduction
Chapter two Literature review
Chapter three  methodology
Chapter  four  Data analysis
Chapter  five Summary,discussion & recommendations
ReferenceReference
QuestionnaireQuestionnaire
AppendixAppendix
Chapter summary1 to 5 chapters
Available documentPDF and MS-word format


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