Modeling and Design of DC Boost and AC Side Voltage Controllers in Asymmetrical ?-Source Inverter.

In this paper a control system is proposed to simultaneously control the voltage boost and output voltage of assymetrical ?-Source Inverters. Dynamic model of the system is used to design the controllers. Voltage boost on assymetrical ?-Source Inverters is done by voltage control of impedance network capacitor and the regulation of inverter shoot through duty cycle. Since the stability margin of the system is low due to the right half plane zero in its dynamic model, the design of fast control system is impossible therefore a nonlinear feedforward control loop is used to faster the control system performance. Linear control system is used to control the AC-side in synchrony reference frame such that the AC voltage control system regulates the output voltage by means of modulation index regulation. The proposed control system performance is investigated by simulation in MATLAB/Simulink.