Abstract
With the wide application of non-linear loads and the large-scale access of distributed energy generations based on power electronics equipments, power quality problems in the distribution network are increasingly serious with new characteristics. Further in-depth research is of great significance in theory and practice. This paper provides an overview of power quality analysis, compensators, and control technologies under the new situation of smart grid. It focuses on the topologies and control methods for power quality conditioners, especially new characteristics of power quality and applicable control technologies in microgrids and distributed power plants. Finally, trends and prospects of power quality control technology are introduced, which is important to achieve security and efficient operation of the smart grid.
Highlights
In the modern smart grid, the diversity of loads and the demands for highly efficient consumption, as well as the use of renewable energy generation and grid connection technology through the power electronics interfaces, have brought great challenges to governing power quality [1,2,3,4]
This paper provides an overview of the power quality control technology in the smart grid
The active power filter (APF), STATCOM, unified power quality controller (UPQC) based on modular multilevel converter (MMC) have been discussed at a preliminary level [18,19,20]
Summary
In the modern smart grid, the diversity of loads and the demands for highly efficient consumption, as well as the use of renewable energy (solar, wind, biomass energy, etc.) generation and grid connection technology through the power electronics interfaces, have brought great challenges to governing power quality [1,2,3,4]. Power quality control theory and technology will play an important role in ensuring the stable and secure operation of the power grid when microgrids or distributed power plants are connected to it. It consists of power transmission part, power distribution part, and power consumption part. Active control and local compensation technology are two important means to suppress the circulating current or harmonic resonance, and to analyze the emission features between DGs and electrical loads in the distribution network. A brief description is introduced for novel power quality compensators featuring modular multilevel technology, such as solid-state transformers and high voltage DC converters. The paper analyzes the trends and prospects of power quality control technology
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