Performance of Conventional Power Flow Routines for Real-Time Distribution Automation Applications

摘要

Three iterative techniques for power flow calculations of radial circuits were analyzed in this study to determine their desirability for real-time distribution system applications. The objective was to identify a technique that is fast (preferably using a simple algorithm), accurate (giving good estimates of voltage and power flows), and stable (yielding results for widely varying load conditions). In addition, we were interested in an analysis technique that performs well for radial circuit configurations (since conventional power flow techniques are employed primarily for large transmission network systems), that is able to utilize monitored data such as bus voltages and real and reactive power, and that is able to accomodate system reconfigurations. The Newton-Raphson technique was determined to be the most stable iterative technique for distribution feeder power flow analysis. However, the memory requirements and the computational requirements of the Newton-Raphson technique are excessive for real-time analysis of complex radial circuits. Equivalencing of the detailed radial feeders may be used to simplify the circuits and to improve the performance of the Newton-Raphson technique. Another technique that uses linear equations to solve for bus voltages and power flows combined with data base manipulating capabilities to handle system reconfiguration is being pursued as well. (ERA citation 11:019842)