Z-Source Inverter for Fuzzy Logic Control Using Adjustable-Speed Drives System

An 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 waythat 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 Fuzzy logic control 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.The paper presents a fuzzy logic speed control system based on fuzzy logic approach for an indirect vector controlled induction motor drive for high performance. The analysis, design and simulation of the fuzzy logic controller for indirect vector control induction motor are carried out based on fuzzy set theory.