IEEE 2015 Power Electronics Renewable Energy Projects Abstract Title List Topics

for stand-alone PV systems, based on an improved Flyback-Forward topology. It provides a compact single-unit solution with a combined feature of optimized maximum power point tracking

(MPPT), high step-up ratio, galvanic isolation, and multiple operating modes for domestic and aerospace applications. A theoretical analysis is conducted to analyze the operating modes followed by simulation and experimental work. This paper is focused on a comprehensive modulation strategy utilizing both PWM and

phase-shifted control that satisfies the requirement of PV power systems to achieve MPPT and output voltage regulation. A 250-W converter was designed and prototyped to provide experimental verification in term of system integration and high conversion

efficiency.

applications based on interleaved fly back converter topology operating

in discontinuous current mode. In today’s PV inverter technology, the simple and the low-cost advantage of the fly back topology is promoted only at very low power as micro inverter. Therefore, the primary objective of this study is to design the fly back converter

at high power and demonstrate its practicality with good performance as a central-type PV inverter. For this purpose, an inverter system rated at 2 kW is developed by interleaving of only

three flyback cells with added benefit of reduced size of passive filtering elements. A simulation model is developed in the piecewise linear electrical circuit simulator. Then, the design is verified and optimized for the best performance based on the simulation results. Finally, a prototype at rated power is built and evaluated

under the realistic conditions. The efficiency of the inverter, the total harmonic distortion of the grid current, and the power factor are measured as 90.16%, 4.42%, and 0.998, respectively. Consequently, it is demonstrated that the performance of the proposed

system is comparable to the commercial isolated PV inverters in the market, but it may have some cost advantage.

Transformer less PV Grid-Connected Inverter with Constant Common-Mode Voltage

to better eliminate the leakage current induced by the common mode

voltage, the clamping technology can be adopted to hold the common-mode voltage on a constant value in the freewheeling period. A full-bridge inverter topology with constant common-mode voltage (FB-CCV) has been derived and proposed in this paper, two unidirectional freewheeling branches are added into the ac

side of the FB-CCV, and the split structure of the proposed freewheeling

branches does not lead itself to the reverse-recovery issues for the freewheeling power switches and as such super junction MOSFETs can be utilized without any efficiency penalty. The passive clamping branches consist of a capacitor divider and two diodes, is added into the dc side of the FB-CCV, therefore, the weakness of active damping branch has been overcome, and the better clamping performance has been achieved in the freewheeling

period. In the dead time between the main switches and the freewheeling switches, the ant parallel diodes of diagonal main switches of the FB-CCV form the freewheeling path to clamp the

common-mode voltage at a constant value, and a quasi-unipolar SPWM strategy is presented. The operation principle, differential mode, and common-mode characteristics of the FB-CCV, Heric, H6, and HB-ZVR topologies are analyzed and compared in detail.

Finally, the viability of the FB-CCV is verified by a universal prototype inverter rated at 5 kW.

in order to obtain high step-up voltage gain. In addition, two capacitors

are charged during the switch-off period, using the energy stored in the coupled inductor which increases the voltage transfer gain. The energy stored in the leakage inductance is recycled

with the use of a passive clamp circuit. The voltage stress on the main power switch is also reduced in the proposed topology. Therefore, a main power switch with low resistance RDS(ON) can

be used to reduce the conduction losses. The operation principle and the steady-state analyses are discussed thoroughly. To verify the performance of the presented converter, a 300-W laboratory prototype circuit is implemented. The results validate the theoretical analyses and the practicability of the presented high step-up converter.

voltage range. It is derived by ntegrating a two-phase interleaved boost circuit and a full-bridge LLC circuit together by virtue of sharing the same full-bridge switching unit. Compared with conventional full-bridge LLC converter, the gain characteristic is improved

in terms of both gain range and optimal operation area, fixed-frequency pulse width-modulated(PWM)control is employed to achieve output voltage regulation, and the input current ripple

is minimized as well. The voltage across the turned-off primary side

switch can be always clamped by the bus voltage, reducing the switch voltage stress. Besides, its other distinct features, such as single-stage configuration, and soft switching for all switches also contribute to high power conversion efficiency. The operation principles are presented, and then the main characteristics regarding gain, input current ripple, and zero-voltage switching (ZVS) considering the nonlinear output capacitance of MOSFET are investigated and compared with conventional solutions. Also, the design procedure for some key parameters is presented, and two kinds of interleaved boost integrated resonant converter topologies are generalized. Finally, experimental results of a converter prototype with 120–240 V input and 24 V/25 A output verify all considerations.

in which high-power high-voltage step-up dc–dc converters are the key equipment to transmit the electrical energy. This paper proposes a resonant converter which is suitable for grid-connected renewable energy sources. The converter can achieve high voltage

gain using an LC parallel resonant tank. It is characterized by zero-voltage-switching (ZVS) turn-on and nearly ZVS turn-off of main switches as well as zero-current-switching turn-off of rectifier diodes; moreover, the equivalent voltage stress of the semiconductor devices is lower than other resonant step-up converters. The

operation principle of the converter and its resonant parameter selection is presented in this paper. The operation principle of the proposed converter has been successfully verified by simulation

and experimental results.

regulation of a hybrid energy storage system composed of batteries and super capacitors. With an effective frequency-domain shaping of the virtual output impedances, the battery and super capacitor converters are designed to absorb low-frequency and

high-frequency power fluctuations, respectively. In this way, their

complementary advantages in energy and power density can be effectively

exploited. Furthermore, the proposed concept can be integrated into a mode-adaptive power management framework with autonomous mode transitions. The entire solution features highly versatile functions based on fully decentralized control. Therefore,

both flexibility and reliability can be enhanced. The effectiveness of the presented solution is verified by experimental results.

Carbide Transistors

of ground currents and power  decoupling to be addressed is first discussed. The proposed solution of a bidirectional buck boost converter, dynamically varying dc link, and half-bridge inverters is then presented along with details on the basic functionality. Some aspects of selecting passive components for the circuit are discussed. The average dynamic model and control system are then presented. Finally, simulation and experiment results are shown demonstrating that the proposed topology is a viable solution.