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[转载]【电力电子】【2018.09】三相并网SIC太阳能逆变器的设计与实现

已有 209 次阅读 2021-7-22 20:56 |系统分类:科研笔记|文章来源:转载

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本文为土耳其中东技术大学(作者:MEHMET CANVER)的硕士论文,共133页。

 

本研究设计并实际制作了一个30kw电压型三相逆变器及SiC-MOSFET模组,以配合移相全桥(PSFB)最大功率追踪(MPPT)转换器,使这两个转换器构成一个完整的系统解决方案。商业化SiC功率MOSFET的出现,使得开关频率比传统Si基开关器件有了很大的提高。这种情况是本论文在提高开关频率范围的主要动机之一,目的是减少逆变器的无源元件体积,如LCL滤波器和直流环节电容器的体积,减少损耗,从而减少散热片的体积、提高效率。

 

设计并实现了一种由总装机容量为23.75kw太阳能电池板供电的PSFB-MPPT逆变器。对输出特性进行了研究,并在并网闭环模式下将功率高达22.32kw的电源接入电网。研究了死区时间和输出线电流变化对逆变器开关特性、漏源电压、未滤波线电流和零电压开关现象的影响。在不同的输出功率下记录了总谐波失真,在最大输出功率为22.32kw时,总谐波失真最小值为3.84%。根据不同的输入和输出功率计算实验效率值。在额定输出功率的一半时获得了98.55%的峰值效率,在峰值输出功率时获得了98%的效率。

 

In this research work a 30 kW gridconnected voltage source three-phase inverter with SiC MOSFET module has beendesigned and implemented, in order to work with a phase-shifted full bridge(PSFB) maximum power point tracker (MPPT) converter, in such a way that thesetwo converters compose a full system solution. The emergence of commercial SiCbased power MOSFETs, which have short turnon and turn-off times, has enabled toincrease switching frequency as compared to traditional Si based switchingcomponents. This circumstance was one the main motives of this thesis in thescopes of increasing the switching frequency, in order to reduce passivecomponent volumes of inverter such as LCL filter and DC link capacitor volume,decreasing losses which leads to reduce the heat sink volume and having betterefficiency. Designed and implemented inverter had been operated in the fieldwith PSFB MPPT converter, energized by 23.75 kW total installed capacity solararrays. Output characteristics had been investigated, and in the grid connectedclose loop mode various powers up to 22.32 kW had been transferred into grid.Inverter switching characteristics, drain-source voltage, unfiltered linecurrent and zero voltage switching phenomenon were examined with the change ofdead time and output line current. Total harmonic distortion had been recordedat various output powers, and a minimum THD value of 3.84% had been obtained atmaximum output power of 22.32 kW. Experimental efficiency values was calculatedfrom various recorded input and output powers. 98.55% peak efficiency at halfof rated output power and 98% efficiency at peak output power had beenobtained.

 

1.  引言

2. 光伏系统和三相逆变器综述

3. 三相并网逆变器的工作原理、分析与控制

4. 三相并网逆变器的设计与实现

5. 三相并网逆变器的实验结果

6. 结论与未来展望


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