Operating characteristics of the convertible static compensator on the 345 kV network

Convertible static compensator (CSC), a versatile device based on FACTS technology was designed, developed, manufactured, installed, and tested. The project was a collaborative undertaking by NYPA, EPRI and Siemens Power Transmission & Distribution. The CSC was installed on a 345 kV substation with series elements inserted in two 345 kV lines. The CSC consists of two 100 MVA inverters, two 100 MVA series transformers, and a single 200 MVA shunt transformer with two identical secondary windings. The CSC can be operated in four basic configurations: static synchronous compensator, static synchronous series compensator, unified power flow controller, and interline power flow controller. The CSC was tested under various system conditions and the test results are discussed and analyzed. The tests confirmed the actual power flow control characteristics of the CSC and their close correlation with the design parameters. The CSC utilization on NYPA network results in the increased power flow transfers and enhanced power flow control capability on Marcy-New Scotland and Marcy-Coopers Corners lines. The power flow on Marcy-New Scotland line can be varied by ±125 MW, and on Marcy-Coopers Corners line by ±80 MW.