50kVA Regenerative Active load for power test system

This paper presents 50kVA active load with low loss, which regenerate the power to utility. To make the regenerative load, 3 phase back to back inverter using DSP320C33 have been made and tested. One inverter control the power flow of the test system and the other control the regeneration of the power to utility. It could be used as a nonlinear load, resistive load, and reactive load for single phase AC, DC, three phase AC. Also, load step change and unbalanced load is simply implemented by the proposed converter. The 50kW prototype is made and tested to verify the regenerative load function.

Introduction

The conventional electronic loads are typically designed with dissipative components, which generate substantial power losses and heat. For high power applications, such as 10's or 100's of kilo watts, the power losses are not only unacceptable, but also very difficult to dissipate the heat. The physical size of the entire electronic load will also make it unattractive.