Modified Approach for Harmonic Reduction in Transmission System Using 48-pulse UPFC Employing Series Zig-Zag Primary and Y-Y Secondary Transformer
نام مقاله به فارسی:
نام مقاله به انگلیسی:
روش اصلاح شده برای کاهش هارمونیک در سیستم انتقال با استفاده از ۴۸ پالس UPFC شامل سری ZIG-ZAG اولیه و YY ثانویه ترانسفورماتور
In this paper THD (Total Harmonic Distortion) is analysed and compared by using UPFC in a multi-line transmission system of 500 KV having 5-buses in two different arrangements. The UPFC converters are arranged as a Diode Clamped multilevel Converter (DCMLC) that leads to the cost reduction as compared with other multi-level converters. The comparison has been done by both series zig-zag/2Y-2Δ and series zig-zag/4Y transformer configuration for 48-pulses GTO based diode clamped converter. The THD is reduced to 42.59% and 58.82% of input waveform at bus B2 by using series zig-zag/4Y transformer configuration. This transformer converter configuration also reduces the difficulty of designing the transformer winding ratio. For calculation of THD, FFT analysis is carried out using MATLAB.
The UPFC is a device, which can control simultaneously all the three parameters of line power flow which are line impedance, voltage and phase angle [1-2]. It improves terminal voltage regulation, series capacitor compensation and transmission angle regulation . The UPFC is made out of two voltage-source converters (VSCs) i.e static compensator (SATACOM) and and a static synchronous series compensator (SSSC) with semiconductor devices having turn-off capability, sharing a common DC capacitor and connected to a power system through coupling transformers as shown in fig 1 .
|نوع مقاله||ژورنال ijisa|
|شبیه سازی||در محیط MATLAB|