Improving voltage stability of power systems by appropriate applications of Reactive Current Droop Compensation and Line Drop Compensation schemes

Voltage collapse is one of the most importance reasons leading to the catastrophic failure of power systems. Therefore, many attentions are paid to this research field in recent years. In this paper, The method to mitigate system voltage depressions is studied, which is implemented by combining Reactive Current droop Compensation scheme and Line Drop Compensation scheme. Based on a widely accepted voltage stability analysis tool, which can figure out which generators will have an impact on the maximum permissible loading of a bus and which will not, the control point of voltage regulator can be obtained. The dynamic analyses were carried out on the CIGRE Nordic test system to study the impact of control point location on time to collapse. It is proven with the test results that the voltage stability of power system can be improved with the new scheme.