Reactive power in power system reliability assessment, load limitation and compensation

This article examines the impact of reactive power support limits on the reliability of the power system. When evaluating the reliability of power systems, several load interruptions are caused by violations of the voltage limits, which can be eliminated with the help of reactive power support. Existing methods for assessing the consequences of violations of the voltage limit and reactive power limit do not provide the amount of reactive power support necessary to eliminate violations. The presented work provides a quantitative measure of reactive power compensation to improve reliability. This measure is based on the construction of the probability distribution function of the required reactive power compensation. The expected load loss and expected undersupply energy reliability indicators are used to assess the lack of reactive power support. A non-linear model based on AC power flow is used to accurately represent measures to remove system load limitation.