Steady state voltage stability with AVR voltage constraints

• Published in: International journal of electrical power & energy systems Vol. 43; no. 1; pp. 650 - 659
• Main Authors: Razmi, H., Shayanfar, H.A., Teshnehlab, M.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2012; Elsevier
• Subjects: Applied sciences; Automatic Voltage Regulator (AVR) voltage limit; Disturbances. Regulation. Protection; Dynamical systems; Dynamics; Electric potential; Electric power generation; Electric power plants; Electrical engineering. Electrical power engineering; Electrical machines; Electrical power engineering; Exact sciences and technology; Miscellaneous; Power networks and lines; Power system Differential–Algebraic Equation (DAE) model; Regulation and control; Saddle Limit Induced Bifurcation (SLIB) point; Saddle Node Bifurcation (SNB) point; Saturation; Steady state voltage stability; Voltage; Voltage collapse; Voltage stability; England; United Kingdom; Great Britain; Europe; Saddle Node Bifurcation (SNB) point; Steady state voltage stability; Power system Differential–Algebraic Equation (DAE) model; Automatic Voltage Regulator (AVR) voltage limit; Saddle Limit Induced Bifurcation (SLIB) point; Automatic regulation; Electric stress; Steady state stability; Voltage fall; Power system stability; Voltage control; Degradation; Predictor corrector method; Reactive power; Voltage stability; Power system Differential-Algebraic; Voltage fluctuation; Damaging; Voltage regulators; Equation (DAE) model; Saturation; Bifurcation; Power system faults; Steady state; Bus system; Electrical network; Dynamic stability; Electric power production
• ISSN: 0142-0615; 1879-3517
• DOI: 10.1016/j.ijepes.2012.06.051

► A steady state voltage stability assessment of power systems was investigated. ► A detailed model of power system components was considered. ► The effects of AVR voltage limits of all units in voltage stability were studied. ► Voltage collapse associated with the SNB and SLIB points were studied. ► The results of worst case contingencies were presented. Voltage collapse phenomena are highly affected by the limits of Automatic Voltage Regulator (AVR) voltage that indirectly controls the amount of reactive power generation. Saturation of the limits of the AVR voltage of a unit may result in deterioration of voltage stability. In addition, in some cases when the power network is operating close to the voltage collapse point, the AVR voltage saturation of a unit can change the system voltages immediately from a stable to an unstable state. Thus, a dynamic voltage collapse leading to blackout is expected. This paper presents a steady state analysis of voltage instability associated to the AVR voltage saturation phenomena. For this purpose, a new methodology based on the predictor–corrector method is introduced to trace the total system equilibrium of the power system model. This methodology considers the AVR voltage limits of all generation units and computes both Saddle Node Bifurcation (SNB) and Saddle Limit Induced Bifurcation (SLIB) points. The New England 39-bus system is adopted to illustrate the effectiveness of the proposed method.