System Improvements of Photovoltaic Inverters with SiC-Transistors

2010 ◽  
Vol 645-648 ◽  
pp. 1171-1176 ◽  
Author(s):  
Dirk Kranzer ◽  
Florian Reiners ◽  
Christian Wilhelm ◽  
Bruno Burger
Keyword(s):  
Power Density ◽  
Single Phase ◽  
State Of The Art ◽  
Production Costs ◽  
World Record ◽  
Pv Inverter ◽  
Three Phase ◽  
Single Phase Inverter ◽  
Basic Characteristics ◽  
The Impact

In this paper the system improvements of PV-inverters with SiC-transistors are demonstrated. The basic characteristics of engineering prototypes of normally-off SiC-JFETs and SiC-MOSFETs were measured and their differences in the application are considered. To demonstrate the improvement in PV-inverter performance, a 5 kW single-phase and a three-phase full bridge inverter with normally-off SiC-JFETs were developed at Fraunhofer ISE. Different switching frequencies up to 144 kHz were applied and the impact on production costs and inverter performance was rated under the aspects of an industrial product development. This means, the influences on the efficiency and power density. In this work, a world record in PV-inverter efficiency of 99 % was achieved in a single-phase inverter and for the three-pase inverter, the power density was tripled with respect to commercially available state of the art PV-inverters.

Single Phase PV Inverter Applying a Dual Boost Technology

2016 ◽  
Vol 5 (2) ◽  
pp. 95 ◽  
Author(s):  
Sudha Bhutada ◽  
S.R. Nigam
Keyword(s):  
Single Phase ◽  
Electrical Energy ◽  
Simulation Software ◽  
Matlab Simulation ◽  
Generation System ◽  
Photovoltaic Panel ◽  
Pv Inverter ◽  
Single Phase Inverter ◽  
Pv Generation ◽  
Pv Grid

<p>In this paper, a single-phase PV inverter applying a dual boost converter circuit inverter is proposed for photovoltaic (PV) generation system and PV grid connected system. This system is designed to improve integration of a Single phase inverter with Photovoltaic panel. The DC 24V is converted into to 86V DC and then 86V DC to 312V DC. The 312 V DC is then successfully inverted to AC 220V. Hence solar energy is powerfully converted into electrical energy for fulfilling the necessities of the home load, or to link with the grid. Matlab Simulation software was used for simulation of the circuit and outcome is presented in this paper.</p>

CFD Analysis of Thermal Shadowing and Optimization of Heatsinks in 3rd Generation Open Compute Server for Single-Phase Immersion Cooling

2019 ◽  
Author(s):  
Jimil M. Shah ◽  
Ravya Dandamudi ◽  
Chinmay Bhatt ◽  
Pranavi Rachamreddy ◽  
Pratik Bansode ◽  
...  
Keyword(s):  
Thermal Management ◽  
Power Density ◽  
Heat Sink ◽  
Single Phase ◽  
Data Centers ◽  
Air Cooling ◽  
Third Generation ◽  
Dielectric Fluids ◽  
Immersion Cooling ◽  
The Impact

Abstract In today’s networking world, utilization of servers and data centers has been increasing significantly. Increasing demand of processing and storage of data causes a corresponding increase in power density of servers. The data center energy efficiency largely depends on thermal management of servers. Currently, air cooling is the most widely used thermal management technology in data centers. However, air cooling has started to reach its limits due to high-powered processors. To overcome these limitations of air cooling in data centers, liquid immersion cooling methods using different dielectric fluids can be a viable option. Thermal shadowing is an effect in which temperature of a cooling medium increases by carrying heat from one source and results in decreasing its heat carrying capacity due to reduction in the temperature difference between the maximum junction temperature of successive heat sink and incoming fluid. Thermal Shadowing is a challenge for both air and low velocity oil flow cooling. In this study, the impact of thermal shadowing in a third-generation open compute server using different dielectric fluids is compared. The heat sink is a critical part for cooling effectiveness at server level. This work also provides an efficient range of heat sinks with computational modelling of third generation open compute server. Optimization of heat sink can allow to cool high-power density servers effectively for single-phase immersion cooling applications. A parametric study is conducted, and significant savings in the volume of a heat sink have been reported.

Synchronization of a Single-phase Photovoltaic Generator With the Low-Voltage Utility Grid

2011 ◽  
Vol 134 (1) ◽  
Author(s):  
Nader Anani ◽  
Omar Al-Kharji ◽  
Prasad Ponnapalli ◽  
Saleh Al-Araji ◽  
Mahmoud Al-Qutayri
Keyword(s):  
Renewable Energy ◽  
Single Phase ◽  
Low Voltage ◽  
Phase Lock Loop ◽  
Phase Detector ◽  
Small Scale ◽  
Correct Operation ◽  
Phase Lock ◽  
Pv Inverter ◽  
Single Phase Inverter

The increased generation of electrical energy from renewable sources and its integration into the low voltage grid have necessitated regulations governing the connection of renewable energy generators to the grid. This was deemed necessary to preserve the integrity and the correct operation of the grid. This paper presents a new architecture of a hybrid phase lock loop circuit topology for synchronizing a single-phase inverter fed from a renewable energy source such as a photovoltaic (PV) generator to the low voltage grid. The system uses a digital phase lock loop (DPLL) architecture, which is based on the arctan phase detector, driving a phase lock loop (PLL) to synchronize a PV inverter with the grid. The proposed system has been tested by simulation using simulink/matlab. The test results demonstrate the ability of the system to synchronize a PV inverter with the grid and to re-establish synchronization following a sudden perturbation in the grid voltage such as a single or a multistep change in phase. The system is digital and can be readily implemented using an FPGA (field programmable gate array) and hence can be easily embedded in a home or small scale single-phase PV inverter.

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