单相离网光伏逆变器研究与设计

发布时间：2018-03-31 07:16

本文选题：单相离网光伏逆变器　切入点：BOOST升压电路　出处：《南昌航空大学》2014年硕士论文

【摘要】：人类社会随着科技的进步正在飞速的发展，与此同时对能源的需求量逐渐增多，而当前全球所储存的能源正越加短缺，而且造成的一系列坏的影响正在威胁着人们的生存方式。于是新型可持续绿色能源将是一个前景广阔的研究方向。太阳能正是属于其中，光伏发电由此而生，它以清洁无污染、取之不尽用之不竭的巨大储存、资源普遍而无地域限制等优点而成为当前研究最为广泛的绿色能源之一。本课题以单相离网光伏逆变器为研究对象，对其进行了研究与设计。本文的主要研究内容有： 1、分析对比了光伏逆变器的主电路的各种拓扑结构，，主要分析研究了BOOST升压电路和全桥逆变电路。并同时分析对比了了逆变器的多种调制方式和控制策略，最终采取双极性SPWM调制和PI+重复控制策略。 2、在对各种拓扑分析了的基础上对系统主电路进行建模分析，对逆变器的前级升压电路和后级逆变电路分别作了详细的建模分析，对滤波器进行了设计。 3、在理论分析的基础上，设计了2.5kVA单相离网逆变器样机，对样机的各个模块的硬件进行了详细分析与设计，包括了DC/DC直流变换器与DC/AC逆变电路以及系统其他关键硬件部分，缓冲电路、驱动电路、采样电路等。并对系统几个主要功率器件进行了损耗分析。 4、最后对样机进行了实验验证，通过相关测试仪器观测不同的负载条件下各个电压和电流波形来验证实验结果。实验表明此光伏逆变器设计基本达到预期目标。
[Abstract]:With the progress of science and technology, the human society is developing rapidly. At the same time, the demand for energy is increasing, and the energy stored in the world is increasingly short. And a series of bad effects are threatening people's way of life. So new sustainable green energy will be a promising research direction. Solar energy is one of them, and photovoltaic power generation comes from it, which is clean and pollution-free. It has become one of the most widely studied green energy sources due to the inexhaustible huge storage and the universal resources without geographical restriction. This paper takes single-phase off-grid photovoltaic inverter as the research object and carries on the research and the design to it. The main contents of this paper are as follows:. 1. The main circuit topology of photovoltaic inverter is analyzed and compared. The BOOST boost circuit and the full-bridge inverter circuit are analyzed and studied. At the same time, various modulation modes and control strategies of the inverter are analyzed and compared. Finally, bipolar SPWM modulation and Pi repetitive control strategy are adopted. 2. Based on the analysis of various topologies, the main circuit of the system is modeled and analyzed. The former boost circuit and the back stage inverter circuit of the inverter are modeled and analyzed in detail, and the filter is designed. 3. On the basis of theoretical analysis, the prototype of 2.5kVA single-phase off-grid inverter is designed. The hardware of each module of the prototype is analyzed and designed in detail, including DC/DC DC converter, DC/AC inverter circuit and other key hardware parts of the system. Buffer circuit, drive circuit, sampling circuit and so on. Finally, the experimental results of the prototype are verified by measuring the voltage and current waveforms under different load conditions. The experimental results show that the design of the photovoltaic inverter has basically reached the expected goal.
【学位授予单位】：南昌航空大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464

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