Open AccessTOTAL HARMONIC DISTORTION REDUCTION BY USING SSSC WITH AND WITHOUT BVSI
Author(s) -
Surya Prakash
Publication year - 2014
Publication title -
international journal of power system operation and energy management
Language(s) - English
Resource type - Journals
ISSN - 2231-4407
DOI - 10.47893/ijpsoem.2014.1124
Subject(s) - control theory (sociology) , transmission line , inverter , capacitor , harmonics , voltage source , voltage , reactance , harmonic , total harmonic distortion , ac power , line (geometry) , electric power transmission , computer science , engineering , electrical engineering , physics , mathematics , acoustics , control (management) , geometry , artificial intelligence
This electronic document is a “live” template. The various In present a new Static Synchronous Series Compensator (SSSC) for the control of active power flow on a transmission line is proposed and its effectiveness is investigated. The new SSSC is based on injecting a voltage in a given line to counter or augment the voltage &Powerproduced by the inductive reactance of the line. The resulting compensator, therefore, emulates the control of transmission line reactance and thus, it assists in control by the power transmission capacity. The voltage to be injected in a line is produced by a Binary Voltage Source Inverter (BVSI). BVSI is an attractive recently proposed Voltage Source Inverter. Its output contains very little harmonics and it utilizes very few dc sources unlike conventional multi-level VSIs. The % phase output of the BVSI is synchronized to the line frequency and its phase is arranged to be in or out of phase with the Linereactance drop. The proposed BVSI-SSSC is realized by using three binary proportioned dc sources, which may be appropriately dimensioned capacitors. The resulting output of a BVSI-SSSC is a 15-step ac voltage waveform. The BVSISSSC has a sophisticated set of coordinated controlled which ensure: BVSI frequency is in synchronism with the system frequency, firing pulses are regulated for inverter valves to ensure minimum harmonic content, the selection of Modulation Index and arrangement regulates an appropriate phase relationship to create the desired change in the power flow, andadjustment of firing angles to ensure that the capacitors creating dc binary proportioned sources maintain desired charge on them. Armillary controls may be added to create positive system damping through active power control, and voltagedependent controllers may be added to limit over and under voltage (charging) of capacitors during fault conditions.