Required Shunt Compensation for an EHV Transmission Line

Student: Kim Sin Jonathan Pang

Supervisor: Tapan Saha

Category: Engineering Thesis Project - Power

The increase in the interconnections of Extra High Voltage (EHV) systems with the increased demand for electrical power has elevated concerns about system security and reliability. This increases brought about by environmental and economic pressures has led to an increasingly complex system. The two key concerns of an EHV system are power-frequency over-voltages and obtaining of the maximum power transfer limit over a long transmission line. It has been proven that by using the series and shunt compensations are the best available methods because the transmission distance can be reduced artificially and hence more power can be transferred.

The effect of shunt and series compensation on an EHV long transmission line is studied in this thesis. This is achieved by developing a MATLAB program to calculate the required compensations and by using PowerWorldŽ simulator to conduct a power system analysis on two test case systems to determine the shunt compensation at the load end to maintain the load voltage at a fixed percentage of the sending-end voltage and determine the maximum power transfer limit that may be transmitted under different conditions. The influence of various factors such as the line length, load power factor and the degree of series compensation on the maximum power transfer capability is also investigated. The results obtained have shown that by controlling the shunt and series compensation, it will improve remarkably on the transmission capability.

Thesis Document (PDF)