Underwater arc discharge is one of the most effective water treatment methods because of the effects of intense shockwaves and high ultraviolet radiations. In this thesis, a high-voltage underwater arc discharge system is proposed to study the inactivation of Escherichia coli bacteria, which has an arc-robust feature. It consists of a high-voltage capacitor charger and […]

 The purpose of this thesis is to improve the fault tolerance method based on the hardware of the CHB converter. In this thesis, three new fault tolerance methods for the CHB converter are presented. These three methods produce balanced line-line voltages at the output of the CHB converter without isolating the healthy cells. The first […]

Grid-tied photovoltaic (PV) inverters usually have galvanic isolation. PV systems with transformer have several stages of power conversion which reduce the efficiency, increase the cost of the system. Therefore, removing the transformer can be a suitable option for PV systems.  However, the leakage current can flow through the system because of no galvanic isolation. This […]

مبدل چندسطحی مدولار به دلیل مزایایی مانند مدولار بودن، کیفیت ولتاژ خروجی بهتر، تلفات توان کمتر نیمه هادی ها و نیاز به یک لینک DC ، به طور گسترده ای در کاربردهای توان متوسط و توان بالا استفاده می شود. به دلیل استفاده از تعداد زیاد ادوات نیمه هادی در ساختار این مبدل، احتمال رخداد […]

Maintaining the stability of solar systems is among the most important technical issues in this field. Conventional control methods cannot maintain grid-connected photovoltaic system’s stability under unbalanced conditions in grid-connected inverters. This thesis proposes a novel control and modulation method for a new structure based on cascaded h-bridge converters for grid-connected photovoltaic systems under asymmetric […]

Due to increased number of switches in multilevel converters the possibility of failure is more. To avoid further damages the uninterruptable operation of converter, fault detection and localization and fault-tolerant operation are vital. In this project, a fault detection and localization method, and a method for fault-tolerant operation of CHB converters are proposed.The fault occurrence […]

Modular Multilevel Converter, due to its interesting features and distinctive advantages compared to other multi-level converters, has gained a lot of attention. This type of converter is especially interesting for ac to dc and dc to ac conversions at high voltage levels. Voltage balancing, control and reduction of voltage ripple in floating capacitors are the […]

In this project, the proposed inverter is based on inverting buck-boost DC/DC converter which has been modified to meet the requirements for three phase application. Besides, a novel switching pattern has been used. The overall strategy is that based on the amplitude and phase of three phase grid voltages and the amount of power considered […]

Growth in high voltage power conversion applications in recent years shows the importance and requirement of high voltage/high power converters in power electronic applications. The major limitation in this industry is the maximum voltage blocking capability of semiconductor switches. To overcome this restriction, the power switches are connected in series to build a high voltage […]

Proposed hybrid converter is a series convection of the full-bridge NPC and the CHB converter. Hybrid converter can make equal number of output voltage levels with less number of power switches compared to basic multilevel converters.   Applications: Power Quality Drive