DSP implementation of a neutral current compensator

This paper presents an implementation of a neutral current compensator. The DSP based control circuit is applied to a four-wire three-leg voltage source converter with split DC link capacitor. It aim is to compensate the neutral current and thus the zero sequence currents derived from harmonics and first harmonic unbalance. Neutral current compensation and DC voltage regulation system are analysed. Simulation and experimental results are presented enabling to highlight the system robustness and neutral current compensation effectiveness.