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- W2278850222 abstract "Quasi-Z-source based modular cascaded multilevel converter featuring both the advantages of multilevel converter like modularity, scalability, distributed maximum power point tracking (MPPT) capability and the advantages of quasi-Z-source network (qZSN) like high efficiency, no consideration for annoying switching dead-zone, wide dc voltage boosting range etc. is a promising option for high power solar photovoltaic (PV) system. Nevertheless, inherent mismatch and varied operating conditions (both called module-mismatch) are still the issues to be disclosed. Asymmetrical active power harvesting among individual PV converter modules resulting from module-mismatch will fluctuate dc voltages and polarize the distribution of the alternating terminal voltage and may derivatively destroy the coordination between the QZS and the H-bridges (HB). In this paper, a novel modulation method for qZSN based cascaded modular multilevel converter with two modes which are low-loss mode for normal operation and extended mode for module-mismatch operation is proposed. With the former mode, the switching times are reduced greatly and then low the switching loss. When encountered by module-mismatch, extended mode is able to re-distribute power and then to balance dc-link voltages. Based on the modulation method, a reactive power compensation algorithm (RPCA) with larger operating range is applied in order to mitigate the polarization of ac voltage. Finally, a 3MW/12kV system with the proposed modulation and control strategy is developed in Matlab/Simulink platform. Simulation results are presented to demonstrate the effectiveness of the proposed technology." @default.
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- W2278850222 date "2015-11-01" @default.
- W2278850222 modified "2023-09-26" @default.
- W2278850222 title "A novel modulation method applied in quasi-Z-source based cascaded pv system suffering module mismatch" @default.
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- W2278850222 doi "https://doi.org/10.1109/iecon.2015.7392871" @default.
- W2278850222 hasPublicationYear "2015" @default.
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