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| Three phase four leg voltage source inverter (3P4L VSI) has the ability to carry unbalance and nonlinear loads, which makes it suitable to operate as distributed generator under stand-alone circumstance. However, the added neutral leg at the same time increases the complexity of the control process so that the computation burden becomes inevitably heavier. Model predictive control strategy has been proven robust to control four leg inverters, to solve the existing drawback of variable switching frequency which leads to possible instability, as well as to decrease the controller computation burden, this paper has proposed a strategy combined an effective modulation state with an optimized model predictive control method based on the mathematic model of the inverter. The high performance with fixed switching frequency and higher computation efficiency of the proposed strategy is validated by both simulation and experimental results. |
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| Keywords:Model Predictive Control, Three Phase Four Leg Inverter, Stand-Alone VSI, Unbalanced Voltage Compensation |
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