access icon free Voltage stability analysis of unbalanced distribution systems using backward/forward sweep load-flow analysis method with secant predictor

© The Institution of Engineering and Technology
Received 27/06/2012, Accepted 06/12/2012, Revised 27/11/2012, Published

This study presents a new method for tracing voltage power curves in unbalanced radial distribution power systems. The proposed method starts with the base case loading conditions and leading to the maximum loading point (MLP) whereas no ill-conditioning problems were detected. The calculation is performed by first-order polynomial secant predictor and the solution is corrected using the backward/forward radial power-flow method. Adaptive stepwise control is implemented to improve the overall solution process and reduce the number of the calculated points along the traced curve. The results calculated using the developed method are for both a 33-bus radial feeder and the unbalanced IEEE 13-node and IEEE123-node feeders. The results show that the developed method accurately traces the voltage power curves up to MLP. Comprehensive analysis on unbalanced scenarios shows that load unbalance greatly affects the stability limit of the study system.

Inspec keywords: IEEE standards; polynomials; distribution networks; power system stability; adaptive control

Other keywords: maximum loading point; backward-forward sweep load-flow analysis method; ill-conditioning problems; adaptive stepwise control; first-order polynomial secant predictor; IEEE123-node feeders; MLP; base case loading conditions; secant predictor; stability limit; IEEE 13-node; voltage stability analysis; unbalanced scenarios; voltage power curves tracing; unbalanced radial distribution power systems

Subjects: Distribution networks; Algebra

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