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Modular multilevel converters (MMC) have been at the heart of numerous research projects and publications over the last decade. This topology is particularly challenging when it comes to real-time simulation; it has thousands of power-switching devices, control signals, and differential equations to solve. This has led to various models with different levels of detail. Although, all models are equally...
This paper presents a new control method for indirect matrix converter operating under unbalanced grid voltages. The proposed method aims to achieve balanced output voltages as well as a near unity input power factor operation. First, an opportune reference current accurately generated, and a proportional integral resonant controller are designed in a dq reference frame that is synchronized with the...
In this paper, Selective Harmonic Mitigation (SHM) and Selective Harmonic Elimination (SHE) modulation techniques are combined to generate the appropriated firing pulses for a 4-leg 3-Level Neutral Point Clamped (NPC) inverter. SHM modulation technique is applied to the phase legs in order to get a desired modulation index (ma) and to mitigate the lower order odd non-triplen harmonics (5th, 7th, …)...
A single-dc-source 5-level cascaded H-bridge (CHB) inverter is studied in this paper. All possible switching sequences are analyzed and a sensor-less voltage balancing approach is proposed that regulates the second dc bus (capacitor) voltage at half of the first dc bus amplitude (isolated dc source). The output voltage levels include zero, capacitor voltage and the dc source amplitude. The simple...
Three-phase four-leg neutral point clamped (NPC) inverter is more suitable in dealing with all sort of the loads especially unbalanced/nonlinear due to harmonics issues. Most control strategies applied on four-leg NPC are classified as high switching frequency lead to high power losses and low efficiency. In this paper, selective harmonic elimination pulse width amplitude modulation (SHE-PWAM) technique...
Although, series compensators including dynamic voltage restorer and series active filters in general are considered reliable, a stability analysis of their configuration and their control algorithm is mandatory before their large propagation in the power system. The stability study of three-phase controllers applied in drives and Active filters seems complex and unusual. Thus, this paper presents...
Current-injection rectifiers have found great interest in the Power Electronics community. This is mainly due to their high efficiency related to the reduced number of hard-switching devices, and their reliability with respect to other commonly known rectifiers. This paper presents an experimental investigation of a totally passive three-phase current injection rectifier with an emphasis on the parameters...
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