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This paper proposes design of fractional-order controller for a 4-leg inverter using the concept of Bode's ideal loop transfer function. The 4-leg inverters have been increasingly used to cater nonlinear loads and hence there control is a crucial issue. The linear model of 4-leg inverter has poor phase margin resulting in a highly oscillatory time-domain response. The designed controller makes the...
Commonly used 3-leg inverter interfaces in a microgrid are not capable of maintaining balanced and sinusoidal voltage at their terminals with unbalanced and nonlinear loads. Additional compensating circuits are required to take care of such loads. Simulation and experimental results of 4-leg inverter with nonlinear and unbalanced load justify its use from power quality improvement point of view in...
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