2,2 Power System Stability Characteristics 2.2.1 Introduction and Results Predicting the stability of a large scale power network is an extremely complex problem. In general, because of the intricate interactions among the various lines, generators and load devices, a full modelling of an electric power network requires the solution of a complex system of coupled time varying differential equations. Solutions, generally, cannot be obtained within normal time and budget constraints on a digital computer. They are certainly beyond the resources of this limited study, but even with the larger studies one must usually be content with results based on average network properties and with qualitative descriptions of potential difficulties at the level of individual elements. This section presents a qualitative discussion of the system characteristics in order to convey an appreciation of the problems that can occur. It should be noted that the stability characteristics discussed herein, are the same as those required of conventional generation capacity. The results of this relatively qualitative investigation of stability indicate that: The sudden, unexpected loss of the SPS output would cause a loss of load whenever the power pool was meeting a total load of roughly 40 GWe or less. The largest power pool considered in this study meets a load of 40 GWe or less, 88% of the time. 2. Sudden fluctuations in the SPS output could cause the operation of protective devices which themselves could exacerbate the stability problems. The key points to be made in the following discussion are that if satellite power systems create frequent fluctuations in
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