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Conclusion

The method of linear flow estimation has been shown to be an effective guide in the development of preliminary network designs for later study by conventional transmission analysis techniques. The method has the flexibility to study situations ranging from those where no network presently exists to those where the existing network includes more than one voltage level. The flow-estimation technique, when combined with a procedure for selecting circuit additions, produces a network estimation method for the synthesis of future transmission networks.

A set of computer programs for long-range transmission planning has been developed using linear flow estimation for preparing network designs and AC load flow calculations for modifying these designs. A number of large networks representing both utility companies and power pools have been designed using the linear flow-estimation method. The results were confirmed by AC load flow calculations and used in determining the transmission investment costs in generation-transmission expansion studies.