A pole assignment of state feedback based on system matrix for three-phase four-leg inverter of high speed PM generator driven by micro-turbine

Recently more attention has been paid to the distributed power systems due to their high flexibility and reliability. The high speed permanent magnet (PM) generator driven by micro-turbine has been widely investigated since it has small size, high efficiency and power density. The output high frequency AC power of the high speed PM generator needs to be converted into the AC power with constant frequency and voltage using AC/DC/AC converter. In order to solve the unbalanced load problem, the three-phase four-leg inverter instead of three-phase three-leg inverter was adopted. In this paper, a pole assignment method based on system matrix was proposed for three phase four leg inverter. Small signal model was profound analysed and transfer function matrix was proposed. State space feedback control strategy applying pole assignment was adopted. The simulation results show the feasibility of the proposed design structure and control strategy.