This project is aimed to design and implement grid-tied high frequency high power paralleled converter systems, including EMI filters, line filters, and three-phase three-wire (3ø3W) converters. The systems can achieve active/reactive power injection to grids and can fulfill the rectification with power factor connection. In addition, due to increase of renewable power usage, miniaturization of converters is the trend of Converter development. Thus, we will increase switching frequency to be higher than 100 kHz. To reduce switching loss, SiC or GaN switching devices will be adopted to realize the converters. This project will last for three years. In the first year, we will focus on theoretical analysis, high frequency component searching and design, and implement a 10 kVA converter for verification. In the second year, we will increase the power rating of the 3ø3W converter upto 33.3 kVA. This converter will be designed into a module, which is convenient for later parallel operation. In the third year, we will implement three 33.3 kVA converter modules and develop control scheme to reduce circulating currents among modules and to achieve their uniform current distribution.