LOAD MODELING USING ANFIS TOOL IN VOLTAGE STABILITY STUDIES FOR 6 BUS AND 30 BUS SYSTEM

摘要

Voltage stability continues to be a limiting phenomenon in many power systems. When combined with a continual growth in load, the lack of sufficient and optimally located generation together with the failure to build new transmission facilities has lead many systems to be vulnerable to situations of uncontrollable system voltages. Voltage Instability can result in system blackout To deal with this serious issue, many utilities have mandated the study of voltage stability as a normal component in system planning and operation. While acceptable methods of voltage stability analysis have emerged in recent years, and comprehensive tools have been developed, the issue of load modeling remains a challenge. This paper is to model the loads in order to predict the maximum deliverable power. Modeling a load is a difficult problem because power system loads are aggregates of different devices. Load modeling is representation of composite loads in computer simulations designed to study load flows and dynamic system characteristics.In this paper, modeling of voltage dependent load and ZIP load is carried out using normal load modeling and using ANFIS. Error is calculated between the two models. Modal analysis is carried out to determine the weakest bus in the system which gives a chance to improve the stability of the system. Modeling has been carried out using six bus system and thirty bus system for both voltage dependent load and ZIP load The results of real and reactive power are compared and reported. ANFIS model the system with most accuracy.