More and more distributed generations (DGs) such as solar, wind, and energy storage, etc, inject into the power grid mainly through the power electronics equipments. Large-scale power electronic equipments connected to the grid bring new challenges for traditional power quality. Power quality analysis theory and control technology for smart grid will provide the comprehensive and systematic solutions and approaches in the application of DGs. This special issue is dedicated to reflecting the latest progress and technologies in power quality. The first article reviews an overview of power quality analysis, detection, and control technologies for smart grid, and show the trends and prospects of power quality control technology. The rest of other 14 articles included focus on the following 3 topics: 1) Power quality analysis, detection and estimation; 2) Active control of power quality; 3) Passive control of power quality. In summary, these 15 papers are well organized to address various challenging and solution issues in power quality. This issue is dedicated to address an introduction of power quality analysis and control methods for smart grid mainly including microgrid, distributed power station, and DGs.