Control and Modulation of a Multilevel Active Filtering Solution for Variable-Speed Constant-Frequency More-Electric Aircraft Grids

An Overview of Power Electronics Techniques in Electric Systems for Transport Applications

“…As the increasing use of power electronic subsystems bring several challenges to aircraft power distribution, a five-level voltage source converter (VSC) was employed in [39] to achieve the high performance control of harmonic currents along with a modified PWM strategy. In [40] the compensation of load harmonics in variable-speed constant-frequency (VSCF) aircraft power systems was realized by designing a five-level cascaded H-bridge active shunt filter. In addition, a 50% reduction in the converter switching frequency was accomplished by applying a novel modulation technique, which is based on a phase shift method in [41].…”

Overview of power quality analysis and control technology for the smart grid

“…Dead-beat control (DBC) is based on state equations of the converter and has a good dynamic performance with convenient parametric design, but its control performance is easily affected by circuit parameters and control delay. Compensating the control delay and adding state observation can strengthen the anti-jamming ability of the system [27][28][29]. Based on the finite control set of the converter, model predictive control (MPC) selects the output switch state to optimize the cost function.…”

On linear observers and application to fault detection in synchronous generators

“…Proof First, l R from (10d) is calculated for the (n+1)-dimensional system (32). Only the first n entries are considered which yields…”

“…They have recently been studied in [27] for a machine with constant frequency. Here, special emphasis is put on variable frequency generators as used in wind turbines [28,29] or naval and aircraft systems [30][31][32].…”