A New Design Of High Frequency Structure In Line Interactive UPS

UPS is an important external equipment. It is able to provide sustained, steady and uninterrupted power supply. The high frequency and digital control tends to be the promising methods in the UPS control technology. High frequency and digital control technology in line interactive UPS is the emphases of this paper.The traditional line interactive UPS generally adopted a low frequency structure. So it's heavy, bulky and expensive. Using high frequency structure in the inverter part of the UPS is effective to improve these deficiencies.UPS currently control strategy is mainly based on expert system rules extraction. Designers need to use their experience to set the control rules and parameters. Because the load type and capacity are uncertain, it is lack of specific load and adaptability, the quality control is general. An intelligent control method of using rough set, which has advantage of dealing with the uncertainty date, is used to control the line interactive UPS of high frequency structure. And the experiments show the feasibility and effectiveness of the program.