Guilherme Sebastião da Silva

PD modulation strategy for modular multilevel converters

This paper proposes a Phase Disposition (PD) modulation strategy for the Modular Multilevel Converter (MMC). The proposed modulation strategy produces output line-to-line voltages with 4N+1 levels. Furthermore, a sorting algorithm guarantees the individual submodule capacitor voltage balancing and a hysteresis controller keeps the inner currents into a desired band. Simulation results are presented to demonstrate the good performance of the proposed modulation strategy.

Space vector pulse width modulation for Modular Multilevel Converters

This paper proposes a space vector vector pulse width modulation (SVPWM) stratey for Modular Multilevel Converters (MMCs). The proposed modulation generates multilevel output line-to-line voltages with 4N+1 levels. Furthermore, the virtual vectors are developed for the MMC and it allowed to establish the converter voltage limits and implement a proper inner currents control. Moreover, the voltages across the submodule dc capacitors can be well balanced with closed-loop controllers and a sorting algorithm. Finally, simulation results are presented to support the theoretical analysis demonstrating the good performance of the proposed modulation technique.

Synchronization methods applied on active power filters — A comparative study

This paper proposes an analysis of the impact of five different synchronization methods on the performance of the compensation currents generated by shunt active filters. The discrete model of shunt active filter is presented considering its implementation in a DSP. Furthermore, two control loops are used to perform the control, an external loop to regulate dc-ling voltage that uses a servo system control and an internal loop to control the currents generated by active filter that employs deadbeat robust control. Finally, experimental results obtained from a 3.3kVA prototype are presented, demonstrating the performance of the currents generated by three-phase shunt active filter.