Analytical Representation of the Relationship Between Generator Design and System Fault Behavior

Abstract

Abstract-This paper presents the development and application of an analytical method for formalizing the dependence of the behavior of a large power system under fault conditions on the equivalent impedance presented by a single generator. After selecting an appropriate generator model, it is demonstrated that network-wide fault behavior can be expressed as a rational function of the equivalent impedance presented by a single generator under fault conditions. This representation simplifies the identification and depiction of constraints imposed by system configuration on the ability of a generator replacement or augmentation to affect fault behavior. The effectiveness of the proposed method is confirmed by considering the three-phase fault currents produced in a six-bus test system. In addition, the new analytical method is extended to obtain a numerical estimate of the maximum possible change in fault behavior that could result from a generator replacement or augmentation. Overall, the new approach aids in the evaluation of the suitability of generator modification or augmentation schemes.Index Terms-Power generation faults, power generation planning, power system faults, rational functions.

On‐line short‐circuit current analysis and preventive control to extend equipment life

“…McDonald and Saha [12], Liu et al [13] and Mortezapour et al [14] tried to find how generator design can affect short‐circuit current by different measures such as the so‐called ‘breakpoint separation approach’ and Yu et al [15] studied how motors affect short‐circuit current.…”