Masoud Barakati

• Doctor of Philosophy(PhD)
• Professor (Assistant) at University of Sistan and Baluchestan

A promising solution for operations in the moderate voltage and high-power ranges, the Alternate Arm Multilevel Converter (AAMC) distinguishes itself with a distinctive topology as an AC-DC Voltage Source Converter (VSC). However, traditional implementations require numerous sensors to maintain capacitor voltage balancing across series Full-Bridge...

The Nested Neutral Point Clamped (NNPC) converter, functioning as a voltage source Converter (VSC), provides an effective solution for applications requiring Medium-Voltage and High-Power (MVHP). Earlier implementations of this converter typically required many sensors to maintain capacitor voltages equally in all series Half-Bridge Sub-Modules (HB...

In this paper, first, a model predictive control (MPC) for a single-phase current source rectifier (CSR) is developed and used in electric vehicle (EV) charger structures. Due to the uncertainties in its model caused by varying points of connection to the power grid, a disturbance estimator is necessary. In addition to the uncertainties, the CSR mo...

In multilevel converters (MCs), system components such as capacitors and semiconductor switches are very susceptible to damage. Furthermore, utilizing voltage sensors to balance capacitor voltages increases the system’s cost and complexity while decreasing reliability. This paper presents methods for voltage balancing of capacitors, capacitance mon...

This book is the result of more than ten years of teaching the classic engineering optimization course to graduate students. The aim is to present optimization methods as simple and comprehensive as possible, along with fundamental proofs and diverse examples. It is suitable for teaching an optimization course that covers most linear and nonlinear...

A new sliding mode controller (SMC) design is proposed for a single-phase current source rectifier (CSR) integrated into onboard electric vehicle (EV) chargers. The controller's design aims to reduce the impact of varying grid impedance on the CSR's performance by using a disturbance estimator. The proposed method utilizes the Lagrange extrapolatio...

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...

Accessibility to sustainable and reliable electrical energy for remote area power supply (RAPS) systems under high penetration levels of wind energy requires adopting appropriate technologies and controllers. In recent years, energy storage has gained significant attention for smoothing inherent voltage and power fluctuations of standalone systems....

The modular multilevel converter (MMC) is an innovative structure that has expanded the usage of multilevel converters (MLCs) in the electrical industry. Since the MMC initially required a large number of sensors to manage the capacitor voltages, various studies have been done to reduce their number to improve the converter's reliability and reduce...

The nested neutral point clamp (NNPC) converter is one of the most promising solutions for medium voltage motor drive applications. However, reliability due to the presence of semiconductor switches in the structure of this converter is one of the most critical concerns. The semiconductor switches are always one of the main components prone to fail...

The alternate arm multilevel converter (AAMC) is a new type of voltage source converter topology introduced as an attractive option for medium voltage and high-power applications. In AAMC, many series full-bridge sub-modules (FB-SM) are used to achieve high-voltage applications. Despite this, a large number of voltage and current sensors are needed...

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...

Model predictive control (MPC) is considered one of the best non-linear control methods for controlling the modular multilevel converter (MMC) due to various advantages, such as no need for direct modelling, high dynamic response, and the ability to manage multiple control targets simultaneously. In this paper, a current closed-loop controller (CCL...

Current-source inverters (CSIs) have advantages, such as voltage boosting capability and direct current controllability, in high-power conversion applications with low switching frequency. However, inadequate damping of the passive $CL$ filter gives rise to low-order harmonic resonance. The recent research regarding active damping techniques gene...

The voltage harmonics and voltage unbalance, as well as voltage drop due to the electrical faults, can damage the sensitive loads. Various voltage compensators, such as the series active power filter (SAPF) and dynamic voltage restore (DVR) have been developed to overcome these problems. In this paper, a new compensator is introduced, which can sim...

Recently, the nested neutral point clamped (NNPC) converter has been developed for medium voltage applications. This converter has been considered for its desirable properties, such as application in a wide range of voltages, the low voltage stress on the switches, and excellent output waveform quality. This study presents a fast open-circuit fault...

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 paper, a new method for controlling the DC-link voltage and maximum power point tracking (MPPT) of the photovoltaic (PV) system in a hybrid PV-wind turbine system is introduced. The system under study is a modified PV-DFIG structure. In this system, the PV output power is injected into the grid through the both grid-side and rotor-side conv...

Due to its voltage boosting capability and current controllability, the current-source inverter (CSI) is a strong candidate for interfacing high-power photovoltaic (PV) systems with the utility grid. However, the harmonics from semiconductor switching or grid voltage give rise to resonance and render the converter unstable. Active damping technique...

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...

Controlling of a standalone wind dominated system under variable load conditions and fluctuating wind is a challenging task. Energy storage systems (ESSs) can play a significant role in stabilizing voltage of such systems. In this paper, a nonlinear controller is designed for a remote area power supply (RAPS) system consisting of the wind turbine b...

In this paper, for high and low numbers of voltage levels, two new generalized multilevel converters are introduced, which comprise a six‐switch H‐bridge and several switched‐source units. Switched‐source units consist of bidirectional and unidirectional switches along with a dc voltage source. The two proposed topologies are compared with topologi...

Temporary overvoltages (TOVs) typically caused by short-circuit faults and switching events can impose considerable damage on power system equipment. Furthermore, the penetration of distributed generations into the utility grids may intensify the problem arising from the TOVs. Despite recent research advancements, the TOV problems with current-sour...

In this paper, a standalone photovoltaic (PV) system with an improved sliding mode control (SMC) based on the maximum power point tracking algorithm is presented. The system contains a solar panel, a single‐ended primary‐inductor converter, a control part, and a load. Because of the nonlinear behavior of the switching and solar panels, designing a...

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...

This paper introduces a new generalized cascade switched-capacitor multilevel converter based on the cascaded connection of several switched-capacitor units. The presented circuit can boost the magnitude of input dc voltage sources using switched-capacitor units. An optimization method is used to achieve maximum output levels with the least number...

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...

Abstract More than one hundred countries are using wind energy due to their easy implementation, cheap energy, and high energy efficiency. Implementation of FACTS devices in Wind Energy Conversion Systems (WECS) has been dramatically improved due to cooperative and accurate performance of FACTS devices. However, dealing with wind turbine faults pro...

Modulation algorithms of indirect matrix converters (IMCs) are complicated and need powerful processors, such as DSP along with FPGA or CPLD for implementation. Using any extra hardware increases the cost and complexity and also reduces the reliability of the system. In this paper, a new realization for the space vector modulation (SVM) of the IMC...

A voltage source inverter (VSI) is widely used as an interface for distributed generation (DG) systems. However, high-power applications with increasing voltage levels require an extra power converter to reduce costs and complications. Thus, a current source inverter (CSI) is used. This study presents a precise phasor modeling and control details f...

The Z‐source network idea has opened up a new research area in the power electronics field. In this paper, a new switched‐inductor network, called extended switched‐inductor quasi‐Z‐source inverter (ESL‐qZSI), is proposed. From a topological point of view, the new inverter has an additional inductor and three diodes compared with the switched‐induc...

Frequency control is a critical issue in power systems. Today, increasing penetration of renewable energy sources have make this issue more complex. Renewable energy sources, due to their intermittent nature and low inertia, cause transient instability and frequency deviation of the power system. Adding the inertia virtually to the system by implem...

The issue of reliability in power electronic converters (PECs) has received comparatively less attention by researchers. Among PECs, the multilevel inverter is a favourite choice of industry in the area of medium-voltage and high-power uses. To study the reliability of PECs, first, the failure rates of elements such as diodes, capacitors, and switc...

Electric spring (ES) along with the smart load (SL) have recently been used as a smart technology for stabilising distribution networks. ESs are embedded on non-critical (NC) loads in order to protect critical loads against voltage fluctuations. Three different generations of ES have been developed in recent years. A comprehensive control scheme is...

Catalytic combustion of hydrocarbons is an important technology to produce energy. Compared to conventional flame combustion, the catalyst enables this process to operate at lower temperatures; hence, reducing the energy required for efficient combustion. The reaction and activation energies of direct combustion of hydrocarbons (CH → C + H) on a se...

Trajectory tracking control for helicopters, which are widely used in severe situations such as military and rescue missions, is a challenging field of research. In helicopter system, the stability problem and predefined trajectories tracking are main challenges, especially in the presence of external disturbances and dynamic model uncertainties. H...

With enormous demand for wind energy worldwide, application of doubly-fed induction generator (DFIG) wind turbines has proliferated in wind power plants in recent years. However, utilization of DFIG-based wind farms integrated with series compensated lines may lead to a particular type of subsynchronous resonance (SSR) called subsynchronous control...

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...

Electric Spring (ES) is an emerging technology which has been used previously for stabilizing power grid while contributing to the load shedding through the sacrificing non-critical load. This young ES has some limits and drawbacks which should be more nurtured to make it more mature. One of these weaknesses is no protection on the non-critical loa...

Support vector regression (SVR) is a learning method based on the support vector machine (SVM) that can be used for curve fitting and function estimation. In this paper, the ability of the nu-SVR to predict the catalytic activity of the Fischer-Tropsch (FT) reaction is evaluated and the result is compared with two other prediction techniques includ...

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...

In electric vehicles, the battery is exposure to an excessive stress because of continuously charging and discharging. In this paper, a hybrid energy storage system (HESS) combined of supercapacitors (SC) and batteries is deployed. An energy management strategy based on fuzzy logic controller (FLC) and rule based controller (RBC) are proposed to mi...

Energy is one of the most important requirements in development of societies. In the last decade, widespread attention has been paid to renewable energies. Despite the obvious advantages of renewable energy resources, their dependence on climate change is one of the most fundamental problems facing to the development of them. Optimal design of hybr...

This paper addresses a new control strategy for a variable wind energy conversion system. The proposed controller aims to regulate the output power tightly in response to the desired value changes and alleviate power oscillations against the disturbances, including wind speed variation and fluctuation of the voltage magnitude, as voltage sag and sw...

Switched boost inverter (SBI) topology exhibits advantage similar to Z-source inverter (ZSI) with fewer passive components; however it requires more active component. In this study a new class of single-stage high inversion gain inverters based on transformers is proposed. Switched trans boost inverter (STBI) is built by replacing inductor in switc...

Piezoelectric actuator is widely used in precision positioning mechanism for the advantages of ultra-high resolution, easy miniaturization, and rapid dynamic performance. But piezoelectricity material has nonlinear hysteresis effect. Due to this characteristic, accurate tracking is difficult to be achieved. In this paper, a model for piezoelectric...

In this paper, a hybrid energy storage system (HESS) included a supercapacitor (SC) is proposed for reducing the battery current stress in hybrid electric vehicles. The battery and SC sizes will be optimized based on a desired minimal mileage and a power demand profile, respectively. The proposed energy management strategy will be implemented by fu...

This paper addresses a new control strategy for a variable wind energy conversion system. The proposed controller aims to regulate the output power tightly in response to the desired value changes and alleviate power oscillations against the disturbances including wind speed variation and fluctuation of the voltage magnitude, as voltage sag and swe...

Islanding of DGs in micro grid has created many problems in operation and network management. Thus correct and accurate diagnosis of this phenomenon is one of the most important cases in micro grid protection. Passive methods are the most conventional methods in this case. These methods are based on electrical parameters measurement in the point in...

جزیره ای شدن منابع تولید پراکنده در ریزشبکه ها، مشکلات زیادی را در بهره برداری و مدیریت شبکه ایجاد می کنند. بنابراین تشخیص درست و به موقع این پدیده، یکی از مسائل مهم در حفاظت ریزشبکه می باشد. متداول ترین روش های تشخیص جزیره ای، روش های پسیو هستند، اما ناحیه ی غیرقابل تشخیص بزرگتری نسبت به سایر روش ها دارند. اساس این روش ها اندازه گیری پارامترهای ال...

Voltage disturbances, especially voltage sag, may cause considerable losses and problems in electrical devices. Dynamic voltage restorer (DVR) is a compensation series device which can avoid load voltage from grid disturbances. This paper proposes a new DVR structure based on three-phase to single- phase AC/AC matrix converter. Due to removal of DC...

Short-term load forecasting (STLF) of electric power systems plays an essential role in the optimal operation of power systems. Economic performance and reliability of a power system is substantially dependent on the load prediction. STLF is a complex process in electric grid due to having many non-linear factors, such as daily and weekly cyclical...

Using a precise short-term load forecasting (STLF) reduces the operating costs and increases reliability of power system operations. In this paper, a brain emotional prediction (BEP) method is used for STLF. The ability of the method is verified in a practical power system, using its electricity demand data. An algorithm is developed to choose the...

A novel short-term load forecasting method based on the lazy learning (LL) algorithm is proposed. The LL algorithm's input data are electrical load information, daily electricity consumption patterns, and temperatures in a specified region. In order to verify the ability of the proposed method, a load forecasting problem, using the Pennsylvania-New...

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...

This paper propose a new method for designing a stand-alone hybrid wind-PV-diesel-battery (WPDB) system that minimizes the inequality coefficient (IC), annualized cost of system (ACS), and maximizes correlation coefficient (CC) using multi-objective particle swarm optimization (MOPSO) algorithm. The proposed method uses data from solar radiation, t...

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...

In this paper, modeling and PWM based control of an electro-pneumatic system, including the four 2–2 valves and a double acting cylinder are studied. Dynamic nonlinear behavior of the system, containing fast switching solenoid valves and a pneumatic cylinder, as well as electrical, magnetic, mechanical, and fluid subsystems are modeled. A DC–DC pow...

A secure self-biased remote controller for precisely adjusting the micropump of a drug delivery system, working at 956 MHz, is proposed. The controller transceiver is secured by using a Barker code sequence. Surface acoustic wave device, as a bandpass filter, is designed with minimum insertion loss and a sharp bandwidth matching the single frequenc...

Design of sustainable energy systems for the supply of electricity need correct selection and sizing to reduce investment costs. In this article, a new sizing methodology is developed for stand-alone hybrid wind/photovoltaic (PV) power systems, using multi-objective optimisation algorithms. Multi-objective particle swarm optimisation algorithm and...

Hybrid Electric Vehicles (HEVs) are driven by two energy convertors, i.e., an Internal Combustion (IC) engine and an electric machine. To make powertrain of HEV as efficient as possible, proper management of the energy elements is essential. This task is completed by HEV controller, which splits power between the IC engine and Electric Motor (EM)....

Adaptive neuro-fuzzy inference system (ANFIS) is combining a neural network with a fuzzy system results in a hybrid neuro-fuzzy system, capable of reasoning and learning in an uncertain and imprecise environment. In this paper online training of ANFIS is done using radial basis function (RBF) neural network. In this online approach, identification...

A MEMS based capacitive sensor for high sensitivity micro-force measurement is proposed and discussed. A 3D-model is considered for only one equivalent capacitance, which resulted outputs can be extracted to the entire device, when multiplied by the number of the combs. The effects of various semiconductors as the base material are studied and the...

ANFIS is combining a neural network with a fuzzy system results in a hybrid neuro-fuzzy system, capable of reasoning and learning in an uncertain and imprecise environment.In this paper, an adaptive neuro-fuzzy inference system (ANFIS) is employed to control an unmanned aircraft vehicle (UAV). First, autopilots structure is defined, and then ANFIS...

A wind energy conversion system (WECS) including a variable wind turbine in grid-connected mode is considered to control. In this paper, each component of WECS model is systematically presented and then the integrated overall model is validated.Regarding to nonlinear nature of WECS and the complex system structure as multiple-input multiple-output...

The grid connected Wind Energy Conversion Systems (WECSs) have two practical topologies, the traditional fixed speed and the new variable speed. Variable speed systems have several advantages over the traditional ones, such as reduction of mechanical stress and increase in captured energy; however, the systems need a Power Electronic (PE) converter...

One problem with the design of a linearized controller for a wind energy conversion system (WECS) is the extremely nonlinear behavior of the system, resulting in a poor performance. The scope of this paper is to enhance the linearization precision and the controller performance efficiency, and to design a linear state feedback based on linear quadr...

In this paper, an improved bacterial foraging algorithm (IBFA) is employed to solve economicemission dispatch (EED) problem. Regarding to more interest to renewable energy sources especially wind energy in recent years, it is necessary to use of incorporate wind power plants into EED problem. To consider realistic conditions, EED is included bi-obj...

A wind energy conversion system (WECS) including a variable wind turbine in grid-connected mode is considered to control. In this paper, each component of WECS model is systematically presented and then the integrated overall model is validated.Regarding to nonlinear nature of WECS and the complex system structure as multiple-input- multiple-output...

In this paper, a nonlinear model associated to the fast switching on-off solenoid valve and pneumatic cylinder is dynamically presented. Furthermore, the electrical, magnetic, mechanical, and fluid sub-systems are studied. Two common control policies to track valve position, a proportional integrator (PI) based on pulse width modulation (PWM) and h...

Optimization of design parameters based on electromagnetic simulation of microwave circuits is a timeconsuming and iterative procedure. To provide a fast and accurate frequency response for a given case study, this paper employs a neural network modelling approach. First, one of the case study's outputs, i.e., scattering parameter (|S21|) in dB, is...

According to the growth of power generated by wind farms and the increased number of non-linear loads, providing a high quality electrical power, should be considered. This paper is addressed the issue of application and analysis of a Dynamic Voltage Restorer (DVR) to enhance the quality of power flows in a stand-alone microgrid, including wind ene...