Design and Performance Analysis of High Power Static 400-Hz Supply

Static power converters are used for many applications, like frequency converters for motors, uninterruptible power supplies(UPS´s), general power supplies, and also with ground power units(GPU) for airplanes. This paper analyses the performance of high power static 400 Hz supply system. In such a system, the topology is a three single- phase H-bridge inverter with a multi-limb output transformer with star-star connection. In this paper, we compares two ways of control. In the supply system, we adopt a fully digital control method. The method can be used for inverter, which is used in 400 Hz aircraft ground power units. In order to improve the output voltage´s waveform. It uses a harmonic controller for controlling the output voltage´s low order harmonics. We test on a 90-kVA 400 Hz GPU prototype based-on a 16-bit fix-point DSP, which show good performance of the proposed method feeding linear or unbalanced load.