Welcome to the 21st International Conference on Harmonics and Quality of Power ICHQP is one of the premier international conferences in the field of electrical power engineering and the only IEEE PES conference dedicated to the area of power quality. The conference presents academic and industrial work of technical excellence at the forefront of power quality research and practical developments. The 21 st ICHQP will continue this tradition, providing an excellent opportunity for individuals from academia and industry working in the area of power quality to come together to share and exchange ideas. The 21st ICHQP will be held in Tianfu International Convention Center, Chengdu(China) from October 15 to 18, 2024. The conference is hosted by Sichuan University, technically supported by the IEEE Power and Energy Society, technically sponsored by China Electrotechnical Society, Southwest Jiaotong University, Chongqing University, Asian Power Quality Industry Alliance, State Grid Sichuan Electric Power Company and Sichuan Society for Electrical Engineering, and sponsored by Liaoning Rongxin Power Technology Co.,Ltd. In the meantime, please contact us if you have questions on any aspect of the conference. The history of the IEEE International Conference on Harmonics and Quality of Power (ICHQP) can be traced back to 1984, when the IEEE International Conference on Harmonics in Power Systems (ICHPS) was established to facilitate the exchange of ideas amongst researchers working on power system harmonics. The conference series was renamed in 1996 as the IEEE ICHQP when its scope was expanded to include all aspects of power quality. Topic Over the years, the scope of ICHQP has been adjusted to drive innovation on the most important topics in power quality, with current topics of interest including, but not limited to: Power Quality Analysis Power Quality Mitigation Technologies Distribution System Planning for Power Quality Power Quality Monitoring /Reporting Methodologies and Indices Power Quality State Estimation Impacts on Systems and Equipment Power Quality Standards Equipment Power Quality Immunity Transients – Propagation, Measurements and Modelling Harmonic Generation and Propagation Interharmonics and other Non-Harmonic Distortion Power Quality Case Studies Probabilistic Aspects of Power Quality Economic Impacts and Management of Power Quality Renewable Generation / Distributed Generation and Power Quality Smart Grid Technologies for Power Quality Time-Varying Harmonics Light Flicker and Voltage Fluctuations High Frequency Distortion in the Range 9-150 kHz Power Quality in Liberalized Energy Markets Power Quality in E-mobility Infrastructures Lightning-induced Power Quality Issues Power Quality and Reliability Power Quality Data Analytics Forecasting Techniques Applied to Power Quality ……