微型逆变器与变换器控制策略研究

发布时间：2018-06-14 21:59

本文选题：微型逆变器 + 微型变换器　；参考：《南京航空航天大学》2014年硕士论文

【摘要】：光伏并网发电装置和储能装置是新能源发电系统的重要组成部分。由于不同光伏组件，不同储能装置之间的差异性，传统的集中式光伏发电架构和集中式储能架构在可靠性以及系统能源利用率等方面存在重要缺陷。为解决该问题，分布式光伏发电架构与分布式储能架构应运而生。微型逆变器和微型变换器在分布式新能源发电系统中得到了广泛运用。本文首先介绍了微型逆变器的特点以及优势。对交错反激光伏并网微型逆变器的常用控制策略：电流临界连续和电流断续工作模式进行了损耗分析，指出针对200W交错反激光伏并网微型逆变器，电流断续工作模式更为有效。在此基础上，针对电流断续工作模式(DiscontinousConduction Mode, DCM)的损耗进行了详细分析，提出一种在半个工频周内采用一相DCM和两相DCM混合调制的控制策略。所提混合调制策略可以根据负载情况不同，降低变换器的主导损耗，优化变换器效率。为验证理论分析的正确性，在实验室搭建了一台200W的交错反激光伏并网微型逆变器，并给出了详细的实验结果和分析。本文分析了传统移相控制和三角波控制时双有源全桥双向DC-DC变换器的工作特性并进行了对比，指出采用传统移相控制和三角波控制混合调制可以使变换器在全负载范围实现高效率。在此基础上，本文对三角波控制时双有源全桥双向DC-DC变换器的损耗分析进行了详细分析，提出一种变频混合调制策略；轻载时，采用变频三角波控制方式；重载时，采用定频传统移相控制方式。所提变频混合调制策略根据不同负载情况下主导损耗不同，，采用不同控制策略，降低变换器总损耗，提高变换器效率。为验证理论分析的正确性，研制了一台12V输入、380V输出的500W的双有源全桥双向变换器，并进行了实验验证。实验结果验证了所提变频混合调制策略相比于传统移相控制策略的优势。
[Abstract]:Photovoltaic grid-connected power plant and energy storage device are important components of new energy generation system. Because of the difference between different PV modules and energy storage devices, the traditional centralized photovoltaic power generation architecture and centralized energy storage architecture have important defects in reliability and energy efficiency of the system. In order to solve this problem, distributed photovoltaic generation architecture and distributed energy storage architecture emerged as the times require. Micro-inverters and micro-converters are widely used in distributed new energy generation systems. This paper first introduces the characteristics and advantages of miniature inverter. The current critical continuous mode and current intermittent mode are used to analyze the common control strategies of the interleaved inverter. It is pointed out that the current intermittent mode is more effective for the 200W interleaved laser grid-connected miniature inverter. On this basis, the loss of discontinuous production mode (DCMs) is analyzed in detail, and a control strategy using one-phase DCM and two-phase DCM mixed modulation in half frequency cycle is proposed. The proposed hybrid modulation strategy can reduce the dominant loss of the converter and optimize the efficiency of the converter according to the different load conditions. In order to verify the correctness of the theoretical analysis, a 200W interleaved inverse laser volt grid-connected miniature inverter is built in the laboratory, and the detailed experimental results and analysis are given. In this paper, the operating characteristics of dual active full-bridge bi-directional DC-DC converters with traditional phase-shifting control and triangular wave control are analyzed and compared. It is pointed out that the traditional phase-shift control and triangular wave control hybrid modulation can achieve high efficiency in the full load range. On this basis, the loss analysis of dual-active full-bridge bi-directional DC-DC converter under triangle wave control is analyzed in detail, and a frequency conversion hybrid modulation strategy is proposed. Adopt constant frequency traditional phase shift control mode. According to the different dominant loss under different loads, the proposed hybrid modulation strategy uses different control strategies to reduce the total loss of the converter and improve the efficiency of the converter. In order to verify the correctness of the theoretical analysis, a 500W dual-active full-bridge bidirectional converter with 12V input and 380V output is developed and verified experimentally. The experimental results show that the proposed hybrid modulation strategy is superior to the traditional phase shift control strategy.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46;TM615

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