A new adjustable-speed drives (ASD) system based on high-performance Z-source inverter

A new adjustable-speed drives (ASD) system based on the high-performance Z-source inverter. It can overcome limitations of conventional Z-source inverter system. The proposed system can operate at wide range load with small inductor. It eliminates the possibility of the DC-link voltage aberrances; simplify the Z-source network inductor and controller design. It increase the inverter modulation index M and decrease the ripple current by changing the magnitude and distribution of the harmonics and then decrease the iron loss of the motor. The IGBT switch is controlled in such a way that it is in off state when inverter is in shoot-through state and switch is in on state when inverter is in non-shoot through state. The v/f ratio is maintain constant to maintain DC link voltage constant and control the modulation index of PWM gate pulses of the inverter. The operating principle and analysis has been carried out and proposed model is simulated. The simulation result verifies the validity of the proposed high-performance Z-source inverter adjustable speed drives system.