The 2021 International Electrical Engineering Congress (iEECON2021) is a premier international academic conference organized by Rangsit University, Thailand and the Electrical Engineering Academic Association (Thailand), EEAAT. The iEECON2021 will provide a forum for researchers, engineers and industry experts to discuss recent developments, new ideas and breakthroughs in Electrical Engineering technologies. Topics of interest include power & energy, communications, electronics & control, digital signal processing, and computer & Information Technology. Each manuscript will be peer-reviewed, and revised according to the reviewers comments. Abstract of all submission accepted and presented will be published in the abstract book of iEECON2021, and the full manuscript will be submitted for inclusion into IEEE Xplore database. The iEECON2021 will be held in Pattaya, Thailand. Pattaya is 150 kilometres southeast of Bangkok, and faces the Thai Gulf. Pattaya is Asia's premier beach resort, and caters with equal appeal to families, couples and single visitors. Pattaya's relaxing tropical ambient is synonymous with every ingredient for memorable holidays.