Abstract
This paper investigates on-load tap changer OLTC effect on voltage stability. Chaos theory used in this analysis is via the calculation of the maximum power transmission. Resulted chaotic behavior is exhibited by singular induced bifurcation which clearly shows the voltage stability of the power system with OLTC from a singular induced bifurcation point of view. The paper is organized as follows: 1) increasing in the maximum reactive power via increasing the ratio of OLTC and the possibility of voltage collapse decrease under the same load command. 2) Noting that the voltage instability is directly affected by the load characteristics, shown via the effect of OLTC on the voltage instability under different static load models. 3) Studying voltage stability in state space and the effects of the generator excitation current limit, the OLTC and load dynamics on voltage collapse. In addition, a small-disturbance voltage stability region of a power system is constructed. The voltage stability of the system is determined by the dynamic characteristics of both the OLTC and the load.
Highlights
In the last three decades, worldwide, voltage collapse system black-outs have stimulated researchers’ interest on voltage stability [1,2]
The dynamic process of the voltage collapse has been analyzed based on load, on-load tap changer (OLTC) dynamics and using the load bus voltage V as a state variable in the load model [11, 12]
Dynamic and static aspects of voltage collapse have been qualitatively investigated [13] and has presented a time-domain simulation to analyze the effects of the OLTC and load dynamics on the voltage collapse in the input/output parameter space (P, V) [14]
Summary
In the last three decades, worldwide, voltage collapse system black-outs have stimulated researchers’ interest on voltage stability [1,2]. The dynamic mechanism of the voltage collapse due to the OLTC operation has been presented [10], where the voltage collapse process has been reconstructed employing a nonlinear dynamic model of the OLTC, the static impedance load and decoupled reactive power-voltage equations. The dynamic process of the voltage collapse has been analyzed based on load, OLTC dynamics and using the load bus voltage V as a state variable in the load model [11, 12]. Dynamic and static aspects of voltage collapse have been qualitatively investigated [13] and has presented a time-domain simulation to analyze the effects of the OLTC and load dynamics on the voltage collapse in the input/output parameter space (P, V) [14]. This paper studies the effect of load and OLTC characteristics, the generator excitation current limit, OLTC and load dynamics on the voltage stability
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