FIG. 4 is a block diagram of another exemplary FACTS 400. FACTS 400 includes transmission lines 102, 104, and 106, load 108, power sources 110, 112, and 114, and var compensator 128. FACTS 400 also includes a second load 402 to which real and reactive power are delivered through transmission lines 404, 406, and 408. Real and reactive power delivered to load 402 through transmission lines 404, 406, and 408 is generated by power sources 410, 412, and 414.

In certain embodiments, transmission lines 102, 104, and 106 represent one transmission path within a grid, and transmission lines 404, 406, and 408 represent another transmission path within the grid. In such embodiments, power sources 110, 112, 114, 410, 412, and 414 are synchronous. In alternative embodiments, power sources 110, 112, 114, 410, 412, and 414 are asynchronous, and FACTS 400 further includes one or more additional transformers or power electronics to couple transmission lines 404, 406, and 408 to transmission lines 102, 104, and 106.