Abstract
This paper presents an Impedance Source Inverter for A.C electrical drives. The impedance source inverter employs a unique impedance network cable with inverter main circuit and rectifier. By controlling the shoot-through duty cycle, the z-source inverter system using MOSFETS provide ride-through capability during voltage sags, reduces line harmonics, improves power factor and high reliability, and extends output voltage range. Analysis, simulation, and experimental results will be presented to demonstrate these new features. It reduces harmonics, electromagnetic interference noise and it has low common mode noise.
Highlights
The traditional inverters are VOLTAGE SOURCE INVERTER (VSI) and Current Source Inverter (CSI)
The dc link voltage is roughly equal to 1.35 times the line voltage, and the V-source inversion is a buck converter that can only produce an ac voltage limited by the dc link voltage
The Vsource inverter based PWM VSI and CSI are characterized by relatively low efficiency because of switching losses and considerable EMI generation
Summary
The traditional inverters are VOLTAGE SOURCE INVERTER (VSI) and Current Source Inverter (CSI). For light load operation or small drives with no significant inductance, the line current becomes discontinuous “double-pulse,” and the dc voltage is closer to 1.41 times the line –to-line input voltage 400V motor, the low obtainable output voltage significantly limits output power that is proportional to the square of the voltage. This inverter has unique features compared with the traditional sources It consists of voltage source of the rectifier supply, Impedance network, three phase inverter and with A.C. motor load. Capacitors required less capacitance and smaller in size This impedance network, the constant impedance output voltage fed to the three phase inverter main circuit. This is a two-port network that consists of split inductors L1 and L2 and capacitors C1 and C2 connected in X-shape This state provides the unique buck-boost feature to the inverter
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