One problem with a single source three-level inverter is the drafting of its neutral-point voltage. This may occur during transition or when unbalanced loads are connected to the inverter system. Variation of neutral-point voltage may greatly deteriorate the power quality. In this paper, we employ an equivalent-input-disturbance approach to deal with this problem. By adding an extra neutral leg, the control problem of neutral-point voltage is converted to a disturbance rejection problem. This method suppresses the variation of the neutral-point voltage to a low level and reduces the capacity of DC-link capacitors. Simulation results show the effectiveness of the method.
|Number of pages||7|
|Journal||Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control|
|Publication status||Published - 2013 Jan 1|
- Neutral-point voltage
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering