AN INTER-AREA TRANSMISSION AND VOLTAGE LIMITATION (TVLIM) PROGRAM

This paper presents a new planning tool, called the Transmission and V oltage Limitation (TVLIM) program, which provides a graphical display of the set of all feasible and secure inter-area megawatt transfers. T he TVLIM program identifies the voltage magnitude limits, thermal load ing limits, and voltage stability limits that limit power transfer bet ween areas. These limits define the boundary of a security region, cal led the TVLIM region, in the space of area imports of real power. Two TVLIM regions are generated, one for the base case operating condition and the other for the next contingency set. The next contingency TVLI M region identifies the limiting contingencies in addition to the weak links in the network. A 39-bus and a 300-bus test system are used to illustrate the TVLIM display.