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Design and Simulation Analysis of Intercell Transformer based on Five-level T-type Inverter
Yu Han,Shanshan Wang,Xuanxi Liu,Hanyoung Bu,Dongmin Choi,Younghoon Cho 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
To improve the power density of the five-level T-type inverter, a three-phase intercell transformer (ICT) is proposed. The three-phase ICT is the integration of three separate coupled inductors of the proposed inverter on a single core. The ICT created by the coupled inductor often does not alter the output current but does lessen the current ripple in the windings. It also reduces losses, and with the smaller size, the power factor of the ICTs can be much higher than that of the inductor. The paper analyzes the structure of the six coil core, and an equivalent model of the magnetic circuit is established. The method was optimally analyzed by coupled simulation of Maxwell and Simplorer. Furthermore, this result is further verified in the PSIM simulation.
Terminal Voltage Analysis according to Filter Types of Motor Drive System with Long Cables
Xuanxi Liu,Yu Han,Shanshan Wang,Hanyoung Bu,Dohong Lee,Younghoon Cho 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
This work starts with a comparison between Ansys simulation software (HFSS, Q3D, and Q2D) combined with circuit diagram simulation (Ansys circuit) and actual measurements for a longitudinally homogeneous unit length of cable and finally selects the most suitable simulation method Q2D combined with Ansys circuit. The finite element simulation modeling and the circuit simulation can effectively simulate the inverter-cable-motor system, which can be a key tool to solve the overvoltage phenomenon at the motor end. In this paper, firstly, through the finite element modeling of the power cable, a finite element model matching the characteristic parameters of the cable is obtained, a high-frequency motor model is established in the circuit, and the frequency response of the cable and the motor is obtained through experimental and simulation comparison. This confirms the validity of the finite element simulation. And through the inverter drive regulation analysis of switching frequency, duty cycle on the motor end overvoltage, and cable length and motor end relationship, accurate simulation modeling will provide an effective way to analyze the motor overvoltage phenomenon and help to better simulate the inverter-long cable-motor system.