Power Quality aspects of Smart Grids

Abstract

This paper gives an overview of the smart grids developments, seen from a power-quality viewpoint; describes the main relations between smart grids and power quality, and goes into some detail for some of the aspects. Different types of real and virtual energy storage are distinguished. Power-quality monitoring in the smart grid is discussed in detail. Further aspects discussed in the paper are: emission by new devices; interference between devices and power-line communication; allocation of emission limits; improving voltage quality; immunity of devices; and weakening of the transmission grid. Although the smart grid brings many new power-quality challenges, these should not result in the introduction of unnecessary barriers against the introduction of new technology.

Method of efficiently predicting the conducted emissions of multiple VSCs

“…It was reported in [2] that conducted emissions from PV inverters has caused accuracy problems with smart meters where they operate in close proximity. It was suggested in [3] that an adequate assessment of harmonic emissions is required in smart grids to guarantee the compatibility between all equipment connected to the grid. Thus the Electromagnetic Compatibility (EMC) of the converter conducted emission is of grave concern for utilities, consumers and design engineers.…”

Batteries Charging Systems for Electric and Plug-In Hybrid Electric Vehicles

“…These requirements should be a characteristic of both parts of the system: the energy supplied by the power grid, as well as the energy consumed by the equipment connected to the grid [18]. Besides the harmonics, other power quality problems, as inter-harmonics, noise (electromagnetic interference), momentary interruptions, sags, swells, flicker, notches, and transients can also occur [19] [20].…”

High Frequency Harmonics Emission in Smart Grids

“…The term 'smart grid', is nowadays very often used in many publications and so far has not been explicitly defined, however it refers mainly to such an operation of electricity delivery process that allows to optimize energy efficiency by flexible interconnection of central and distributed generators through transmission and distribution system to industrial and consumer end-users [1], [3], [11], [13], [15], [17]. This functionality of power delivery system requires the use of power electronic converters at generation, consumer and grid operation levels.…”