Selection of Load Node Model in Power Systems: Fuzzy Logic Approach

Abstract: The performance of a power system during transient operating conditions is highly dependent on the type of loads connected to its nodes. The latter can be constant impedance, constant current, constant power, or any combination of these three types. Hence, in order to properly simulate transient conditions in a power system, it is important to select appropriate load models that accurately describe the actual node loads. Different mathematical models are commonly used to describe node loads. However, the selection and application of mathematical node models is a time consuming process and may not be appropriate when the assessment of the likelihood of transient and stability problems in a power system is required on-line during the operation of the system. This paper presents a new method for selection and implementation of load node models based on the application of indistinct (Fuzzy Logic) approach, whereby the required calculation is made faster than using conventional mathematical approach. Key words: Power system, indistinct set, fuzzy logic, load model, synchronous motor, static load, transient, logic statemen