Power System Spinning Reserve Determination in a Multi System Configuration

The application of probability methods to the spinning reserve area has been illustrated in several recent publications. This material has included the effects of unit deratings1, peaking and hot reserve equipment2 and the benefits associated with interconnected systems3. In the latter case, the effects of load forecast uncertainty and the consideration of unit derating levels were included in the two system interconnection studies. Results were shown for the Saskatchewan and Manitoba Power Systems3. This paper also presented a general approach to interconnection studies in which the assisting system is represented by an equivalent multi-level assistance unit. This equivalent reflects the units in operation and the available reserve in the assisting system and the existing transfer capability between the two systems. The transfer capability may not be a constant value as is normally used in system planning studies but may vary with system conditions.