Grid-Supportive Inverter Technologies for Power Quality Improvement

Abstract

This paper offers a comprehensive review of grid-supportive inverter technologies aimed at enhancing power quality. One area of exploration presents a two-stage three-phase three-wire solar photovoltaic (SPV) system. This system utilises a boost converter for optimal power point tracking and a three-leg voltage source converter to channel the harnessed SPV energy. Distinctively, this approach provides harmonics elimination, grid current balancing, and compensation for the nonactive portion of load currents, going beyond traditional solar inverter functionalities. An innovative adjustable step adaptive neuron-based control method is employed to gauge the genuine power reflecting segment of the load current, ensuring swift dynamic adaptability to environmental shifts. Another focal point addresses the complexities introduced by the rising integration of microgrid systems within the AC distribution framework. Highlighting the imperative of maintaining voltage and frequency, the narrative accentuates the pivotal role of energy storage systems (ESS) for the proficient operation of sensitive loads. A grid adaptive power management strategy (GA-PMS) is proposed, orchestrating the current references for renewable energy sources, ESS, and microgridconnected converters. This strategy guarantees uninterrupted microgrid functionality, priority-driven load shedding, and the maintenance of power quality standards at the local bus. Both areas significantly contribute to the evolution of grid-supportive inverter technologies and their potential in power quality betterment.