Saeed Yousofi

• Doctor of Psychology
• University of Sistan and Baluchestan

The size of energy storage resources has a vital role in the cost, size, and weight of power electronics converters. Multilevel converters usually operate at low switching frequencies to prevent high switching loss. Since modular multilevel converters are constructed of a series connection of some submodules, a lower switching frequency causes a hi...

Multilevel converters (MLCs) are pioneers in the field of electrical energy conversion. From the classification of MLCs, modular multilevel converter (MMC) is very popular due to its attractive structure and performance. The modular nature and no need for isolated DC resources are two great advantages in this converter, but the need for many sensor...

The modular multilevel converter (MMC) is one of the most commonly used power electronic converters in medium and high-power applications. However, reliability is one of the most critical challenges because of the many power switching devices applied in the MMC. Also, many voltage sensors in the converter topology have increased cost and hardware c...

Modular multilevel converters (MMCs) are used in medium and high power applications due to various advantages, such as modularity, scalability, high efficiency, and low THD. In this paper, an improved model predictive control (IMPC) is used to control the converter output current and the circulating current. Using a discrete mathematical model of M...

Modular multilevel converters (MMCs) play an essential role in power conversion for medium and high voltage industrial applications. These types of converters use many sensors for the process of measuring and sorting the voltage of their capacitors, but this increases cost and hardware complexity, as well as decreases reliability. One of the most w...

In this article, the combination of a new capacitor voltage sorting method and an open-loop control approach based on the energy estimation of the arms is used in the modular multilevel converters (MMCs). The presence of circulating current, the use of multiple voltage and current sensors, and the voltage imbalance of the capacitors increase the co...

This paper presents a new asymmetric voltage-source multilevel inverter with a reduced number of components. It is composed of several basic units, where each one can be designed to generate multilevel voltage with positive, zero, and negative levels. The basic units are connected in a cascaded fashion to provide the advantages of higher output vol...

A new DC/AC inverter with ability of supplying two AC loads, independently, based on flying‐capacitor topology is proposed. Flying capacitor enables the converter to have three‐level output voltages which results in high‐quality output waveforms. Comparing to conventional flying capacitor inverter (FCI) for supplying two loads, the new inverter has...

A new inverter that have double-outputs based on flying capacitor topology is proposed for photovoltaic applications. The flying capacitor enables the converter to generate three-level output voltages, thus resulting in high-quality output waveforms. The new inverter has fewer semiconductor switches and flying capacitors (up to 25% and 50% less, re...

Load–frequency control is one of the most important issues in power system operation. In this paper, a Fractional Order PID (FOPID) controller based on Gases Brownian Motion Optimization (GBMO) is used in order to mitigate frequency and exchanged power deviation in two-area power system with considering governor saturation limit. In a FOPID control...

A new inverter topology for single-phase photovoltaic (PV) systems is proposed in this study. The proposed inverter offers a four-level voltage in its output terminals. This feature results in easier filtering in comparison with other conventional two-level or three-level inverters. In addition, the proposed four-level inverter (PFLI) has a transfo...

Because of the characteristics of high efficiency and low cost, the transformer-less photovoltaic (PV) grid-connected inverters have been popularized in the application of solar electric generation system in residential market. However, in these inverters the ground leakage current through the stray capacitors between the PV array and the ground is...