دانلود رایگان مقاله لاتین سیستم خنک سازی هوا از سایت الزویر
عنوان فارسی مقاله:
کاربرد تحقیق حرارتی سیستم خنک سازی هوا در قدرت بالا NPC اینورتر سه سطح بر اساس بلوک ماژول قدرت
عنوان انگلیسی مقاله:
Application thermal research of forced-air cooling system in high-power NPC three-level inverter based on power module block
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
The thermal phenomenon in inverters is mainly caused by power losses of power devices. While power devices themselves are sensitive to temperature, and their conducting and switching characteristics will change with it, which will finally affect the performance of inverters. Therefore, accurate power loss calculation can optimize the cooling system design to ensure stable and reliable operation of inverters. At present, there are many researches on single IGBT (Insulated Gate Bipolar Transistor) module and power loss calculation of two-level inverters, and all the methods are similar. However, the NPC three-level inverter is much more complicated comparing with two-level inverters and the power loss calculation of their power devices is different as well. The main reasons are as follow: (1) The conducting frequencies of all power devices in each bride arm are asymmetric; (2) Each bridge arm installs additional clamping diodes; (3) There are always two power devices working at the same time in any direction of each bridge arm. In view of different characteristics above, several researches on power loss calculation of NPC three-level inverter were made, while some difference and problems still exist. In [1,2], it is the junction temperature which was ignored during the power loss calculation that caused certain errors between calculation and experiment results. The power losses of power devices in high-power NPC three-level inverter were calculated based on SVPWM modulation in [3], which are the average values in one modulation voltage cycle and are much more accurate. An ideal assumption that switching power loss has a linear relation to withstanding voltage were made both in [4,5]. However, it is valid approximately only within ± 20% range of test voltage. In [6], the thermal component model of IGBT was establishedto analyze the electrothermal analysis of IGBT module system. While, it is necessary to build a complicated RC component model to extract thermal resistance and time constants for a thermal network. A practical method was proposed in [7] to design converter cooling system based on power loss calculation of IGBT module, but its design process is complex and lack of experiments in high-power converters. It is considered in [8] that the reverse recovery losses of four anti-paralleled diodes in one bridge arm are totally the same, while in fact, the inner two diodes do not withstand voltage and have no reverse recovery losses. In literature [9], a fast power-loss and temperature simulation method was proposed, and the variation of temperature was described as a function of time using Fourier-based solution through the whole inverter power module structure. The power loss of IGBT module was calculated in [10] to design the cooling system with ANSYS, which is useful but has not been used in high-power applications. Similarly, several researches on forced-air cooling system were made so far. It is expressed in [11,12] that empirical formula and analysis model has been an alternative method to describe a number of different models accurately, and the theory power limit of forced-air cooling system was studied to optimize the heatsink. A fin type array of forced convection cooling plate was described in [13]. A guidance for selecting heatsink and recommendation on design process were offered in [14]. In [15], a comprehensive analysis process was presented and deduced a simple empirical equation, which has enough precision in analysis and design. The electro-thermal analysis of three phase inverter with cooling system was made by simulation in [16], but it is on the basis of equivalent RC thermal model to estimate chip temperature by simulating on water cooling system. In [17], the estimation of power loss considering the junction temperature is introduced and then used the finite element analysis to estimate the peak junction temperature prediction based on the measurement of IGBTs dynamic characteristics. 3-level IGBT modules with trench gate IGBT and their thermal analyses were made in [18], while it is effective only in some special operation modes, such as UPS(Uninterruptible Power Supply), PFC(Power Factor Correction) and PV(Photovoltaic) system. The purpose of this paper is to propose a simple and effective method to provide theory reference during cooling system design. The principle and modeling of power module block was organized in Section II to illustrate the structure and calculate the power losses of power devices. The total power losses of all power devices in one power module was considered as one power source, which will also act as heat sources in the heatsink of forced-air cooling system model to improve the accuracy of power-loss calculation. In Section III, the model based on the real structure was built and the cooling capacity was analyzed to fix calculate the operation point of cooling fan for selecting suitable fan, which will offer much practical references for inverter system design and improvement. The simulation and experiment were arranged in Section IV to prove the proposed method and a conclusion was drawn in Section V.
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کلمات کلیدی:
Application Thermal Research of Forced-Air Cooling System in High ... https://www.researchgate.net/.../309279593_Application_Thermal_Research_of_Forced-... Feb 17, 2017 - Download research paper: Application Thermal Research of Forced-Air Cooling System in High-Power NPC Three-Level Inverter Based on ... Application Thermal Research of Forced-Air Cooling System in High ... https://www.researchgate.net/...Thermal_Research_of_Forced-Air_Cooling_System_in_... Thermal Research of Forced-Air Cooling System in High-Power NPC Three-. Level Inverter Based on Power Module Block, Case Studies in Thermal. [PDF]Application thermal research of forced-air cooling system in ... - ISI-dl isi-dl.com/downloadpdf/136903 Oct 15, 2016 - Application thermal research of forced-air cooling system in high- power NPC three-level inverter based on power module block. Shi-Zhou Xu. [PDF]The Optimized Design of NPC Three-Level Inverter Forced-Air Cooling ... manuscript.jpe.or.kr/LTKPSWeb/uploadfiles/be/.../150420161002009847500.pdf by SZ Xu - Cited by 1 - Related articles target were analyzed, and the forced-air cooling system model based on a series of theoretical ... Keywords:Cooling system, power loss calculation, NPC three-level inverter, heatsink optimization ... and the research goal is to optimize the cooling system into ... high temperature, and a double failure rate comes out with. [PDF]The Optimized Design of a NPC Three-Level Inverter Forced-Air ... - JPE manuscript.jpe.or.kr/ltkPSWeb/pub/pubfpfile.aspx?ppseq=1259 forced-air cooling system model based on a series of theoretical analyses was ... Cooling system, Heat sink optimization, NPC three-level inverter, Power loss ... cooling system of three-level inverters, and the research goal ... calculations and thermal analysis for single IGBT modules ... For high power mine hoists, they.
