Studies on the Scheme of Voltage Control Regulator

Recent power system events have shown that voltage collapse can be a root cause of some widespread outages. The thrust of this paper is to discuss some means of mitigating system voltage depressions that are available through the scheme which utilizes both reactive current droop compensation and line drop compensation. The point that the voltage regulator controls can be acquired by a new method which is based on a widely accepted voltage stability analysis tool. This tool can determine which generators will have an impact on the maximum permissible loading of a bus and which will not. The dynamic analyses were carried out on the CIGRE Nordic test system to study the impact of control point location on time to collapse and prove that the new scheme can improve the voltage stability.