Grid Interaction of Wind Power Generation System Using Maximum-Likelihood Estimator Framework for Power Quality Improvement

Abstract

The renewable energy intermittency indicating generation unavailability and volatility in a microgrid need to be addressed with prime attention. Here, in this work, the operational reliability and generation adequacy are reinforced by integrating a battery as the energy storage to the variable speed wind power generation system (WPGS). The grid interconnection to the system and combined performance offer significant benefits of improved power quality (PQ), energy sufficiency and surety by managing the local load support. The control of the battery allows the generation of the grid reference current. The grid side power converter utilizes the maximum-likelihood estimator based adaptive filter for improving the PQ indices by addressing the prevailing concerns stemmed by nonlinear loads. The control has high tracking performance while dealing with the contingency event of load variation. The machine side power converter utilizes vector control for obtaining the switching pulses. A hardware prototype is developed and the test results acquired substantiate that the work carried out is effective, reliable and offer improved PQ indices.