Abstract—The DC-DC converter for fuel cell vehicles should be characterized by high-gain, low voltage stress, small size and high efficiency. However, conventional two-level, three-level and cascaded boost converters cannot meet the requirements. A new non-isolated DC-DC converter with switched-capacitor and switched-inductor is proposed in this paper, which can obtain high-gain, wide input voltage range, low voltage stresses across components and common ground structure. In this paper, the operating principle, component parameters design, and comparisons with other high-gain converters are analyzed. Moreover, the state-space averaging method and small-signal modeling method are adopted to obtain the dynamic model of converter. Finally, simulation and experimental results verify the effectiveness of the proposed topology. The input voltage of the experimental prototype ranges from 25V to 80V. The rated output voltage is 200V and rated power is 100W. The maximum efficiency is 93.1% under rated state. The proposed converter is suitable for fuel cell vehicles.

Abstract—This paper presents a novel single-stage buck boost transformerless inverter (BBTI) topology for single phase grid-connected solar PV applications. In this topology, the input PV source shares the common ground with neutral of the grid which eliminates the leakage currents. Further, the proposed topology has the buck-boost ability which tracks the maximum power point even under the wide variation of input PV voltage. Another feature of the proposed topology is that it uses only one energy storage inductor which provides symmetric operation during both half cycles of the grid. In addition, the two out of five switches of the proposed topology operate at a line frequency, thereby, it exhibits low switching losses and the other three switches conduct in any mode of operation which incurs low conductions losses. A simple sine triangle pulse width modulation strategy is proposed to control the proposed inverter topology is analyzed at all operating modes and explained in detail. Experiments are carried out on the 300W laboratory prototype and all the major results are included in the paper, which shows that the proposed system gives higher efficiency with lower THD in output current.

Abstract— A traditional H-bridge inverter requires a minimum of four controllable switches and this multiplies with the levels in the inverter output voltage goes up. This work represents an improved multilevel inverter with a reduced number of switches. An improved structure using the sub multilevel concept is proposed for a five-level inverter. This modified H-bridge inverter uses the same level of an inverter with a 25% reduction in the number of switches. This results in reduced switching losses, installation cost, and converter cost. Special care is taken to obtain an optimal number of switches. The proposed inverter is simulated for a five-level using Matlab/Simulink with phase disposition pulse width modulation (PDPWM) control for both resistive and resistive inductive load. A comparison between conventional and modified H-bridge inverter is shown.

Abstract—Robust and intelligent control algorithm design is very essential in the development of power electronics converter to maintain constant output voltage regardless of the variations in input voltage and load. In this article, simulation and analysis of interleaved DC-DC converter for electric vehicle charging applications using adaptive neuro-fuzzy inference system (ANFIS) are presented. The ANFIS based control algorithm for the DC-DC converter is designed to stabilize output voltage and enhance the performance of the system during transient operations. To verify the design, two-phase interleaved synchronous DC-DC buck converter is simulated in MATLAB-Simulink based environment and simulation results on resistive load are presented.

The increasing number of megawatt-scale photovoltaic (PV) power plants and other large inverter-based power stations that are being added to the power system are leading to changes in the way the power grid is operated. In response to these changes, new grid code requirements establish that inverter based power stations should not only remain connected to the grid during faulty conditions but, also provide dynamic support. This feature is referred in the literature to as momentary cessation operation. The few published studies about momentary cessation operation for PV power plants have not shed much light on the impact of these systems on the overall power system stability problem. As an attempt to address this issue, this paper proposes a control scheme for PV inverters that improves the transient stability of a synchronous generator connected to the grid. It is shown through the paper that the proposed control scheme makes the PVinverters dc link capacitors absorb some of the kinetic energy stored in the synchronous machine during momentary cessation. Besides that, the proposed solution is also able to improve voltage stability through the injection of reactive power. Experimental and simulation results are presented in order to demonstrate the effectiveness of the proposed control scheme

ABSTRACT KEYWORDS Oneofthecentral problems in control theory is related to the design of controllers for the improve ment of system performance. The aim of this paper is to design an efficient digital fractional-order proportional-integral-derivative (FO-PID) controller for the speed control of buck converter fed per manent magnet DC (PMDC) motor. Speed control is achieved by a pulse width modulated control. The FO-PID controller parameters (gain and order) are obtained by using the ant colony optimiza tion (ACO) technique. The effectiveness of the proposed control scheme is simulated and verified using MATLAB/Simulink results. The performance comparison shows that the speed control of buck converter fed PMDC motor is improved with proposed FO-PID controller than that of integer-order PID controller.

Abstract- In this paper, a distributed incremental adaptive filter (DIAF) controlled utility interfaced photovoltaic (PV) - battery microgrid system is presented with power quality features. From protection aspects, grid tied solar inverters are required to shut down at loss of the utility. However, the multi-purpose PV-battery system is developed to provide energy to the critical loads, even at loss of distribution network. The bidirectional controlled converter with a battery also mitigates the intermittency of a PV array under rapid variations in the weather. The extracted maximum power is supplied to the voltage source converter (VSC), which is transferred to the nonlinear loads and the utility. The distributed incremental adaptive filter is used to control the VSC with contribution of PV power and the battery. In addition, the DIAF control provides harmonics mitigation, load balancing and power factor improvement functionalities in order to deal with system connected with nonlinear loads. A PV power feed-forward (PVFF) term is incorporated in the current control for injection of active power to the utility as well as to improve the dynamic operation of residential PV-battery microgrid. The battery energy storage (BES) reduces the fuel bills and it is also utilized to provide smoothing attributes to the microgrid. The effectiveness of PV-battery microgrid is validated experimentally developed in the laboratory. Index Term- PV-battery microgrid, power quality and distributed incremental adaptive filter.

Abstract- This paper introduces a single-switch, high step-up, DC-DC converter based on coupled-inductor (CL) with three winding and voltage multiplier cell (VMC) to obtain a very high voltage conversion ratio. A passive clamp circuit is applied in the converter to recycle the energy of leakage inductance and reduce voltage stress of the main power switch. This leads to utilize a power switch with low on-state resistance and low voltage-rating that decreases the conduction losses. Several advantages include low operating duty cycle, high voltage conversion ratio, low turn ratio of the coupled inductor, leakage inductance reverse recovery, reduced voltage stress of semiconductors, alleviation of diodes reverse recovery issue and high efficiency make the presented topology appropriate for sustainable energy applications such as photovoltaic systems. The operation principle and steady-state analysis of the suggested topology in continuous conduction mode (CCM) are expressed in detail. Also, design procedure and theoretical efficiency analysis of the proposed topology are presented. Moreover, a comparison study is performed to demonstrate the superiority of the presented converter over several similar recently proposed DC-DC converters. Finally, the proposed DC-DC converter feasibility and performance are justified through fabricated 216 W laboratory prototype at 50 kHz switching frequency.

Abstract—Most of two-stage converters for electric bike battery charging comprise of boost converter for PFC followed by dc-dc converter with universal-input voltage. These two-stage conversions suffer from poor efficiency and increased component count. In this paper, a single- stage switched inductor Cuk converter based power factor correction converter is proposed which offers high step-down gain, low current stress, high efficiency and reduced component counts. The operational analysis and design equations for various components of proposed converter are carried out in continuous current mode (CCM). This paper presents mathematical modelling, analysis, simulation and experimentation on proposed converter rated for 500 W, 48V/10.4A. The performance investigation of proposed converter with respect to power quality indices like voltage THD, current THD and total power factor are carried out with various types of load such as resistive load and battery load in both constant voltage (CV) and constant current (CC). Furthermore, the dynamic performance of proposed converter with battery charging is investigated in constant voltage mode and constant current mode with respect to wide change of supply variations.

Abstract: High step-up converters are required for distributed photovoltaic generation systems, due to the low voltage of the photovoltaic source. In this paper a new hybrid high voltage gain DC-DC converter, created by merging the standard boost converter with a coupled inductor and different switched capacitor techniques, resulting in a hybrid converter. With a single switch and no requirement of higher duty cycle values, the proposed converter achieves a high voltage gain and high efficiency, in addition to lowered voltage and current stress of the components. A 200 W prototype was implemented experimentally to evaluate the converter, which reached a maximum efficiency of 97.6%.