电导增量MPPT并网逆变器的研究

发布时间：2018-07-28 09:59

【摘要】：太阳能作为一种巨量的可再生能源,是目前大量应用的化石能源的主要替代能源之一,是人类可利用的最直接的清洁能源之一,因此开发利用太阳能具有重大的战略意义。本文设计并研制了一种太阳能逆变器,具有结构简单、稳定性高、效率高的优点。传统的户用逆变电源通常在后级采用工频变压器来实现升压和电气隔离。这种逆变技术虽然性能可靠,但是仍然存在着许多不足之处:系统体积重量大,携带不便,功率密度低,成本高。本文采用高频逆变技术,前级采用BOOST电路升压,后级逆变环节采用半桥电路,从而实现了一种直流输入,标准市电输出的电导增量法MPPT并网逆变器。下面是本文所做的主要工作:1.简要介绍了目前国内外光伏发电的现状和发展前景,并对光伏并网发电系统的功能、分类和特点做了简单介绍。2.详细地分析了逆变电路的拓扑结构和工作原理,分析了在逆变器主电路中,各个元器件的作用以及其具体的选择方法和其参数的估算。3.设计研制了一种电导增量法MPPT并网逆变器,调试得到实验波形。4.研制的并网逆变器额定功率为5kVA,其允许电网电压范围(单相)为180V~260V,其允许电网频率范围为47 Hz~51.5Hz/57 Hz~61.5Hz,具有极性反接保护、短路保护、孤岛效应保护、过热保护、过载保护、接地保护等保护措施。
[Abstract]:Solar energy, as a huge amount of renewable energy, is one of the main alternative energy sources of fossil energy, and one of the most direct clean energy available to mankind. Therefore, the development and utilization of solar energy is of great strategic significance. In this paper, a solar inverter is designed and developed, which has the advantages of simple structure, high stability and high efficiency. The traditional household inverter power supply usually uses the power frequency transformer to realize the booster and electrical isolation in the rear stage. Although the performance of the inverter is reliable, there are still many shortcomings: the system is heavy in volume, inconvenient in carrying, low in power density and high in cost. In this paper, high frequency inverter technology is used, BOOST circuit is used to boost voltage in the front stage and half bridge circuit is used in the back stage inverter. Thus, a DC input and standard municipal output MPPT grid-connected inverter is realized. Here is the main work of this article: 1. This paper briefly introduces the current situation and development prospect of photovoltaic power generation at home and abroad, and briefly introduces the function, classification and characteristics of photovoltaic grid-connected power generation system. The topology and working principle of inverter circuit are analyzed in detail, and the function of each component in the main circuit of inverter, its specific selection method and the estimation of its parameters are analyzed. A MPPT grid-connected inverter with conductance increment method is designed and developed. The rated power of the grid-connected inverter is 5kVA, the voltage range (single phase) of the grid is 180V / 260V, and the frequency range of the grid is 47 Hz~51.5Hz/57 / Hz 61.5Hz. it has polarity protection, short circuit protection, island effect protection, overheating protection and overload protection. Protective measures such as grounding protection.
【学位授予单位】：河北大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM615;TM464

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