scholarly journals Improvement of High-Power Three-Level Explosion-Proof Inverters Using Soft Switching Control Based on Optimized Power-Loss Algorithm

2015 ◽  
Vol 2015 ◽  
pp. 1-14
Author(s):  
Shi-Zhou Xu ◽  
Feng-You He
Keyword(s):  
Thermal Stability ◽  
High Power ◽  
Power Loss ◽  
Thermal Model ◽  
Heat Dissipation ◽  
Soft Switching ◽  
Power Devices ◽  
Loss Calculation ◽  
Output Characteristics ◽  
Thermal Stability Of

The high-power three-level explosion-proof inverters demand high thermal stability of power devices, and a set of theories and methods is needed to achieve an accurate power-loss calculation of power devices, to establish heat dissipation model, and ultimately to reduce the power loss to improve thermal stability of system. In this paper, the principle of neutral point clamped three-level (NPC3L) inverter is elaborated firstly, and a fourth-order RC equivalent circuit of IGBT is derived, on which basis the power-loss model of IGBT and the optimized maternal power-loss thermal model, using an optimized power-loss algorithm, are established. Secondly, in accordance with the optimized maternal power-loss thermal model, the generic formulas of power-loss calculation are deduced to calculate the power-loss modification values of NPC3L and soft switching three-level (S3L) inverters, which will be the thermal sources during thermal analysis for maternal power-loss thermal models. Finally, the experiment conducted on the 2.1 MW experimental platform shows that S3L inverter has the same excellent output characteristics with NPC3L inverter, reduces the power loss significantly by 213 W in each half-bridge, and decreases the temperature by 10°C, coinciding with the theoretical calculation, which verifies the accuracy of optimized power-loss algorithm and the effectiveness of the improvement.

scholarly journals Power Device Thermal Fault Tolerant Control of High-Power Three-Level Explosion-Proof Inverter Based on Holographic Equivalent Dual-Mode Modulation

2017 ◽  
Vol 2017 ◽  
pp. 1-9
Author(s):  
Shi-Zhou Xu ◽  
Chun-jie Wang ◽  
Yu-feng Peng
Keyword(s):  
Thermal Stability ◽  
High Power ◽  
Pulse Width Modulation ◽  
Fault Tolerant ◽  
High Thermal Stability ◽  
Equivalent Model ◽  
Power Device ◽  
Power Devices ◽  
Dual Mode ◽  
Output Characteristics

It is necessary for three-level explosion-proof inverters to have high thermal stability and good output characteristics avoiding problems caused by power devices, such as IGBT, so it becomes a hot and difficult research point using only one control algorithm to guarantee both output characteristics and high thermal stability. Firstly, the simplified SVPWM (Space Vector Pulse Width Modulation) algorithm was illustrated based on the NPC (neutral-point-clamped) three-level inverter, and then the quasi-square wave control was brought in and made into a novel holographic equivalent dual-mode modulation algorithm together with the simplified SVPWM. The holographic equivalent model was established to analyze the relative advantages comparing with the two single algorithms. Finally, the dynamic output and steady power device losses were analyzed, based on which the power loss calculation and system simulation were conducted as well. The experiment proved that the high-power three-level explosion-proof inverter has good output characteristics and thermal stability.

scholarly journals Thermal Characteristics of Spindle Supported with Water-Lubricated Hydrostatic Bearings

2019 ◽  
Vol 13 (5) ◽  
pp. 602-609 ◽  
Author(s):  
Yohichi Nakao ◽  
Rei Kirigaya ◽  
Dmytro Fedorynenko ◽  
Akio Hayashi ◽  
Kenji Suzuki ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Water Flow ◽  
Temperature Increase ◽  
Power Loss ◽  
Thermal Characteristics ◽  
Experimental Results ◽  
Total Power ◽  
Cooling Efficiency ◽  
Power Losses ◽  
Thermal Stability Of

Characteristics of a spindle supported with water-lubricated hydrostatic bearings were experimentally investigated. In particular, this paper focuses on the thermal characteristics of the spindle. The flowrates of water as the lubricating fluid were measured separately for the radial and thrust bearings, in relation to the supply pressure. Fluid power losses owing to pressure losses of the lubricating fluid were then introduced. Furthermore, the power losses owing to the water viscosity were determined by measuring the spindle torque and angular velocity. The experiments revealed that the total power loss of the spindle is approximately 300 W. The cooling effect of the lubricating water was then examined by introducing a temperature increase between the supply and drain water. The experimental results verified that the water temperature increased by approximately 0.8°C, at a spindle speed of 3000 min-1. Based on the temperature increase of the water, the power removed from the spindle by the water flow was estimated. By comparing the generated total power loss and the power transferred by the water flow, the cooling efficiency of the flow of lubricating-water was defined in this paper. If the cooling efficiency is 100%, the temperature change of the spindle can be zero regardless of the power loss, achieving ideal thermal stability of the spindle. Experimental results revealed that the cooling efficiency of the tested spindle was over 80%. This indicates that the flow of water as a lubricating fluid removes generated heat from the spindle effectively, and achieves improved thermal stability of the spindle.

Pyrene-fused PDI based ternary solar cells: high power conversion efficiency over 10%, and improved device thermal stability

2019 ◽  
Vol 3 (1) ◽  
pp. 93-102 ◽  
Author(s):  
Yanbin Gong ◽  
Kai Chang ◽  
Cheng Chen ◽  
Mengmeng Han ◽  
Xuejun Zhan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Solar Cells ◽  
Power Conversion Efficiency ◽  
High Power ◽  
Short Wavelength ◽  
Power Conversion ◽  
Wavelength Region ◽  
High Power Conversion Efficiency ◽  
Short Wavelength Region ◽  
Thermal Stability Of

A class of pyrene-fused PDI-NFAs are designed and synthesized for fabricating ternary OSC devices to improve the absorption in the short wavelength region, VOC and thermal stability of the ternary devices.

Study on Loss Calculation for Inverter Based on 1200V SiC MOSFET

2014 ◽  
Vol 672-674 ◽  
pp. 906-913
Author(s):  
Li Jun Xie ◽  
Jin Yuan Li ◽  
Kun Shan Yu
Keyword(s):  
Power Dissipation ◽  
Power Loss ◽  
Next Generation ◽  
Power Losses ◽  
Analysis Model ◽  
Power Devices ◽  
Loss Calculation ◽  
Converter Design ◽  
The Cost ◽  
Generation Power

SiC MOSFETs are expected as one of next generation power devices for their superior performances compared with conventional Si power devices and have become one of the new promising substitude to Si devices. The characteristics of 1200V SiC MOSFET are presented first and the power losses analysis model of SiC devices are given. As losses of power devices are essential parameters in converter design, the power dissipation of SiC MOSFET in SPWM inverter are calculated. In this paper, whether a free-wheeling-diode necessary is illustrated from the point of power dissipation and choice is made based on the power loss. According to the analysis result, the inverter without SBD shows less power losses, which can reduce the cost and volume of inverter.

Thermal Stability of CoTi-Substituted Manganese-Zinc Ferrites

2008 ◽  
Vol 44-46 ◽  
pp. 71-76 ◽  
Author(s):  
Hai Ning Ji ◽  
Zhong Wen Lan ◽  
Zhong Yu ◽  
L.Z. Li ◽  
Z.Y. Xu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrical Resistivity ◽  
Power Loss ◽  
Strong Influence ◽  
High Thermal Stability ◽  
Experimental Results ◽  
Interactive Process ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrites ◽  
Thermal Stability Of

In this paper, several new main compositions are presented with Mn2+ substituted by Ti4+ and Co2+ in Manganese-zinc ferrites in consideration of the strong influence of Ti4+ and Co2+ on thermal stability by different mechanisms. Moreover, the effects of these substitutions on such parameters as permeability, electrical resistivity, density, and power loss are analyzed. The experimental results show that the proper substitution of Ti4+ or Co2+ in manganese-zinc ferrites can increase the thermal stability remarkably. Furthermore, the effects of composition of Ti4+ and Co2+substitutions have interactive process, especially when Manganese-zinc ferrites with high thermal stability in 20°C~140°C are achieved when the substitution of Ti4+ is 0.10mol%and Co2+ is 0.05mol%.

Sign in / Sign up

Export Citation Format

Share Document