An Accelerated Preventive Agent Based Scheme for Postdisturbance Voltage Control and Loss Reduction

In this paper, a novel agent based dynamic Volt/Var control approach is introduced, by which the voltage security (i.e., voltage profile and mid- and long-term stability) can be improved and also power loss is reduced under postdisturbance condition and in a wide-area manner. The proposed scheme employs organized multiagent system to preserve voltage magnitude of all busbars within permissible range and reduction of power losses after any disturbance through appropriate coordination of reactive power sources. To accelerate exploitation of on-load tap changers (OLTCs) as well as suppressing the possibility of encountering voltage instability which may be initiated by them, a preventive scheme based on sensitivity analysis is proposed which determines efficient number of multitap changes of OLTCs. To evaluate the effectiveness of the introduced algorithm, different scenarios have been performed in Nordic 32 test system, where the numerical results in all cases demonstrate the effectiveness and reliability of the proposed scheme.