Impact of Different Receiving End Points on Transfer Capability of a 765kV HVAC Corridor into the Western Cape Network

When loads are supplied at a distance from the source, there are factors that will limit the power transfer. Such factors are amongst others, the line thermal capacity, the voltage stability limits and angular stability limits. When these limits are reached, certain solutions will be introduced to the network to ensure continuous supply of electricity to the customers. As one of the solutions to this problem, HVAC lines are from time to time considered to improve the performance of the network. This paper indicates that when planning a new HVAC injection to different receiving points where different loads are connected, different load flow results will be obtained depending on the load locations and sizes as well as the network topology at the injection points. Depending on where the power is injected, different system active power losses reduction or gain will be obtained. Again, the different injection points will result in different voltage stability limits.