Effect of ambient temperature variations on estimation of proximity of the voltage collapse point

Abstract

Due to deforestation, greenhouse gases and increasing air conditioner systems, the temperatures are changing drastically and the effects are prominent in summer and winter seasons. These ambient temperature variations are affecting the transmission system parameters and also the voltages at various buses. Changes in the transmission line parameters have non‐negligible impact on system performance and present Energy Management applications are not considering these temperature variations in the power system state estimation. In this paper, impact of temperature variations on the power system Voltage Stability assessment is considered. Voltage stability assessment methods make use of the load flow results. Load flow results without considering the temperature variations are inaccurate in the real‐time and leading to the erroneous results in the voltage stability assessment. In view of this, studies have been carried out on IEEE 30‐bus, 118‐bus and 300‐bus systems, incorporating the seasonal temperature variations on various types of conductors, and also demonstrated the impact with conventional and ZIP type load models. In this paper, four voltage stability indices NLVSI, Lmn, FVSI and VCPI(power) are used for identifying the proximity of voltage collapse point, critical line, critical bus voltage, critical bus angle, total system active power loss, total system reactive power loss etc.

A Novel Voltage Collapse Path Analysis of Primary System Equivalent Model for Smart Grid

“…Recent years have brought development, good foundations for the research of brittleness theory of smart grid system has received some more research results [18,[19][20][21][22][23], which will have important guiding significance for the research of smart grid system. The introduction of new methods provides research directions for the research on the voltage collapse path, some papers propose relaxed decoupled direct calculation method to find voltage collapse points [24,25].…”