Power flow improvement of 220 kv transmission line using static synchronous series compensator. A case of iringa- shinyanga transmission line

International Journal of Electrical and Electronics Engineering

© 2020 by SSRG - IJEEE Journal

Volume 7 Issue 3

Year of Publication : 2020

Authors : Nicholaus George Moyo, Exaud Saul Tweve

10.14445/23488379/IJEEE-V7I3P105

How to Cite?

Nicholaus George Moyo, Exaud Saul Tweve, "Power flow improvement of 220 kv transmission line using static synchronous series compensator. A case of iringa- shinyanga transmission line," SSRG International Journal of Electrical and Electronics Engineering, vol. 7,  no. 3, pp. 24-30, 2020. Crossref, https://doi.org/10.14445/23488379/IJEEE-V7I3P105

Abstract:

A reliable electrical power system plays a vital role in the economy of any society and its failure may seriously affect the economy. In order to achieve the reliable performance of power system different research are being carried out.Flexible AC Transmission Systems (FACTS) devices can control power flow in the transmission system to improve asset utilization, relieve congestion and limit loop flows. The Static Synchronous Series Compensator (SSSC) is a voltage source based series FACTS device that provides capacitive or inductive compensation independent of line current. The SSSC, a voltage source inverter connected in series with the transmission line injects the voltage in quadrature with the line current. In recent years, the demand for electrical power has increased and is expected to keep increasing in the northern part of Tanzania as a number of mining development projects have made progress in northwest regions (Geita, Musoma and Shinyanga) and the economic growth taking place in central region (Dodoma) and northeast regions of Tanzania (Arusha and Kilimanjaro). While power for the north comes mainly from hydroelectric source in the south, it is urgently needed to increase the capacity for transmitting power from the south to the north. The north grid is experiencing a power shortfall due to increase of load demand. This paper describes the active and reactive power flow into the line for purpose of compensation as well as enhancement of power transmission capability of transmission line using SSSC. Neutral point clamped (NPC) threephase, three level voltage source converter was designed using Insulated Gate Bipolar Transistor (IGBTs). The control circuit for voltage source converter was designed using Pulse Width Modulation (PWM) control technique. The peak demand for north regions has been studied. In this paper the load demand forecast for north regions of Tanzania has been performed to estimate the load for the next years. The single line diagram of the transmission line connected in series with SSSC using couplingtransformerwas modeled in MATLAB/Simulink. The simulation results showed that the SSSC performance was satisfactory in increasing power transfer capacity.

Keywords:

SSSC, FACTS,Voltage Source Converter (VSC), Sinusoidal PWM, Load forecasting.

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