Abstract
In grid independent Wind Energy Conversion System, the chance of a mismatch between available wind power and user demand is very high. Therefore, such systems are equipped with an energy storage device like a battery for a typical grid independent system being used even in this research activity. In this paper, mathematical models like Wind Turbine (WT), Permanent Magnet Synchronous Generator (PMSG), Maximum Power Point Tracking (MPPT) controller etc. are built for Wind Energy Conversion System in Saber-RD simulator. The real-time issues observed in parallel-connected wind systems are overloading of PMSG and one of the turbines (out of two) running at higher speed over the other because of which unequal power sharing that occurs while feeding the battery. Certain other issues have been investigated through the modeling and simulation of a given WECS which are crucial to the understanding, analyzing & solving issues faced when more than one WECS each rated 5.1kWp are parallel operated. Such practical systems termed Hybrid (Wind+ Solar) Renewable Energy Systems built on the roof tops of 3 GVP Institutions have been in operation for the last 4 years as grid independent systems. Based on the investigations, it is found that the addition of inductance as a function of synchronous inductance in series with one or more of several PMSGs (Permanent Magnet Synchronous generator) is cost effective to solve the problem of unequal power-sharing while feeding battery storage. The article discusses the validation of such simulation results derived from the sub system models are first validated for given Wind Energy Conversion System and extended to two systems to find the cost-effective solution for issues faced in the operation of such multiple (two in this case) system.
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