The Design Of 30kVA Three-phase Inverter And Analysis Of Inductor Winding Loss

With the development of the new energy, distributed power systems, and the wide use of UPS, research on the inverter is being given more and more attentions. The power rating and the power density are geting higher and higher. How to design a high power density inverter module becomes a R&D hotspot. LC filter is an important component of the inverter to reduce the output harmonics. And the inductor is the indispensable for the LC filter. The equivalent resistance of the inductor affects the performance of the inverter. So the winding loss and the AC resistance of the inductors should also be considered.This dissertation firstly introduces the modern control strategy for inverters, and how the equivalent resistance of the inductor affects on the performance of inverters is pesented. In the second chapter, the hardware design of the inverter module, including designs of its main circuit, the drive circuit, the sampling circuit, and the control circuit etc. is presented in detail.In the third chapter, the designs of the LC filter and the double loop control circuit are presented. And both the simulation results based on SABER platform and the experiment results on an experimental prototype are presented, which verify the theoretical analysis.In the forth chapter, a model of inductors is built up to reflect its more accurate characters. For different inductors, it gives different methods to analyze and calculate the winding losses and the AC resistances of the inductors. Finally different inductors wound by single-strand copper wires, Litz wires, and the parallel multi-strand wires have been made to prove the presented method.