Power system damping controller design-using multiple input signals

We have investigated the use of multiple input signals for the design of power system stabilizers and thyristor-controlled series-compensation controllers. These examples show the benefits of combining input signals to move the system zeros to more desirable locations, allowing the controller to be more effective in providing additional damping to the interarea modes. The multiple-input-signal controller can be used as the primary control system or as a backup system when some of the controllers are temporarily unavailable. In some cases, a multiple-input-signal controller structure may be more cost effective than installing a new control device. The choices of the input signals used for the controller designs in the example systems in the article have been based on good knowledge of the systems