دانلود رایگان مقاله Theory and Experiment on an Optimal Carrier Frequency of a Modular Multilevel Cascade Converter With Phase-Shifted PWM
IEEE Transactions on Power Electronics
Theory and Experiment on an Optimal Carrier Frequency of a Modular Multilevel Cascade Converter With Phase-Shifted PWM
This paper provides theoretical and experimental discussions on an optimal carrier frequency for a phase-shifted PWM modular multilevel cascade converter for grid connections. The discussions conclude that the ratio of the optimal carrier frequency with respect to the supply (ac) frequency is 5/2. A three-phase downscaled front-to-front (FTF) system is designed, constructed, and tested to confirm the theoretical discussion. It consists of a pair of three-phase modular multilevel cascade converters rated at 400 Vdc and 10 kW, where the carrier frequency is set to 450 Hz and the ac frequency to 180 Hz, that is, their ratio is equal to 5/2. Moreover, simulated waveforms are compared to experimental ones under the same operating conditions. Both experimental and simulated waveforms agree well with each other not only in steady states but also in transient states.
Index Terms—Front-to-front systems, grid connections, modular multilevel cascade converters, phase-shifted-carrier PWM.
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