Fast( one to two cycle)control of load unbalance, could be identified and controlled, on the basis of, the limiting value of negative sequence component, and could be achieved by reducing it to the limiting value, refer my paper,' Microprocessor based load balance control (transformer or alternator)............using symmetrical component'.
Donald, Valuing load balancing has been an issue for me since I published my first paper, "Tie Riding Freeloaders--The True Impediment to Transmission Access," Public Utilities Fortnightly, 1989 December 21. Several of these papers are on my web site, LivelyUtility.com
I filed comments last week with FERC on this issue. In the library on my website (LivelyUtility.com) under the FERC Comment section. Look for Docket No. AD14-3.