Future trends in power quality
The chapter presents a review of power quality issues, measurements, monitoring, performance indices, impacts and standards associated with established PQ indices, impacts, emerging limitations and PQ future trends and challenges. The case study presented at the chapter-end presents three new designs of FACTS-based low-cost switched filter compensation devices acting as dynamic Modulated/PWM switched filters to reduce power quality THD of voltages and currents at point of common coupling. The three FACTS devices include hybrid switched power filter, switched/ MPFC and series-shunt FACTS switched power filter. The chapter is intended as a short guide and a review of power quality issues, limitations and emerging challenges due to the increasing use of renewable Energy AC-DC FACTS devices and compensating systems, mushrooming use of non-linear loads and new smart metering and interface issues with the smart grid.