![]() ![]() In terms of modulation, many improved algorithms have been proposed, e.g., in, the space vectors pulse width modulation along with the shoot-through insertions were introduced to the single Z-source NPC three-level inverters. Nevertheless, the control difficulty, e.g., modulation method and stability assurance, would also increase because of the existing of Z-source network. For example, a switched quasi-Z-source DC-DC inverter has been used for PV Systems, and a novel Z-source three-level four-leg inverter has been researched to reduce the leakage current for three-phase PV inverters. With a Z-source network, this NPC three-level converters would have a wide range of adjustable voltage, some allowed shoot-through states and better harmonic distortion in the output, and have been widely used in the photovoltaic(PV) grid-connecting system and the ac drive field. ![]() ![]() NPC three-level converters have significant advantages, e.g., smaller device pressure, lower, and better harmonic distortion in the output. Lastly, comparison experiments have been carried out to make verification of this improved modulation mechanism. Besides, in order to obtain a fixed output harmonic frequency, a combination of this improved MPC and SVPWM has been studied and the shoot-through state insertion for the Z-source also has been analyzed in detail. In this paper, an improved MPC strategy has been developed, with a voltage prediction being designed to replace the current prediction, the calculation of the roll optimization could be effectively simplified significantly, and then the digital execution efficiency would be improved. However, for a neutral-point clamped three-level Z-source converter, the performance of the normal MPC strategy would highly depend on the computation processing rate because of the multiple times optimization calculation. Model predictive control (MPC) method has been widely used to reduce the computational complexity of the traditional space vector pulse width modulation (SVPWM). ![]()
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