Low Voltage Ride-Through of Single-Phase Transformerless Photovoltaic Inverters Yongheng Yang Frede Blaabjerg Huai Wang Aalborg University, Aalborg Denmark

Y. Yang, F. Blaabjerg, and H. Wang "Low voltage ride-through of single-phase transformerless photovoltaic inverters,” IEEE Trans. Industry Applications, in press.

 Abstract 
Transformerless photovoltaic (PV) inverters are going to be more widely adopted in order to achieve high efficiency, as the penetration level of PV systems is continuously booming. However, problems may arise in highly PV-integrated distribution systems. For example, a sudden stoppage of all PV systems due to anti-islanding protection may contribute to grid disturbances. Thus, standards featuring with ancillary services for the next generation PV systems are under a revision in some countries. The future PV systems have to provide a full range of services as what the conventional power plants do, e.g. Low Voltage Ride-Through (LVRT) under grid faults and grid support service. In order to map future challenges, the LVRT capability of three mainstream single-phase transformerless PV inverters under grid faults are explored in this paper. Control strategies with reactive power injection are also discussed. The selected inverters are the full-bridge inverter with bipolar modulation, the full-bridge inverter with DC bypass and the Highly Efficient and Reliable Inverter Concept (HERIC). A 1 kW single-phase gridconnected PV system is analyzed to verify the discussions. The tests confirmed that, although the HERIC inverter is the best candidate in terms of efficiency, it is not very special feasible in case of a voltage sag. The other two topologies are capable of providing reactive current during LVRT. A benchmarking of those inverters is also provided in this paper, which offers the possibility to select appropriate devices and to further optimize the transformerless system.

ORIGINAL URL

http://vbn.aau.dk/files/102349282/77954_tia.2013.2282966.pdf

A NOVEL FORWARD SINGLE-STAGE HIGH POWER CORRECTION CONVERTER WITH CONTROLLER DESIGN - HSUEH -CHAN CHEN

ABSTRACT
In this thesis ,the principle of the graft scheme is dicussed.By means of graft scheme ,the buck-boost and forward converter are combined to create a novel forward single-stage high power correction (HPFC) converter. The main advantages for the proposed converter are unity power factor,low voltage stress of the bulk capcitor,anthe output voltage regulation.
LINK
http://www.mediafire.com/file/m46m6ryzz53458r/A_NOVEL_FORWARD_SINGLE-STAGE_HIGH_POWER_CORRECTION_CONVERTER.pdf

Analysis of Discharge Lamp Driving Characteristics using PSpice Jeong-Ho Cho Department of Electrical Engineering, Graduate School of Industry, Pusan National University

Analysis of Discharge Lamp Driving Characteristics using PSpice Jeong-Ho Cho Department of Electrical Engineering, Graduate School of Industry, Pusan National University 

 ABSTRACT 
A new PSpice dynamic fluorescent lamp model has been developed which describes the non-linear resistance of fluorescent lamps operating at high-frequency. The model is based on exponential approximation that represents the equivalent resistance variation as function of power, constructed, by experimental results for several power levels. Simulation and experimental results are presented to verify the feasibility of the model and, moreover, and electronic ballast example using the proposed model is presented to further demonstrate its applications.

DEVELOPMENT OF 30KVA INVERTER USING SIC MOSFET FOR 180◦C AMBIENT TEMPERATURE OPERATION -Feng Qi1, Miao Wang1, Longya Xu1, Bo Zhao2, Zhe Zhou2 1The Ohio State University, USA -2Smart Grid Research Institute of SGCC, China

LINK http://www.mediafire.com/file/l0hmo41isv7jw8a/INVERTER_SIC.pdf

Sistemas Eletrônicos para Iluminação - Ricardo Nederson do Prado Alexandre Campos Àlysson Raniere Seidel Rafael Adaime Pinto - Universidade Federal Santa Maria - BRASIL

 LINK MINICURSO COMPLETO
http://www.mediafire.com/file/lb8p0qd3ztd7666/ILUMINACAO.pdf