有源滤波器在光伏并网发电系统中的应用研究

发布时间：2018-03-14 18:32

本文选题：光伏发电系统　切入点：并网　出处：《辽宁工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：在能源枯竭及环境污染问题日益严重的今天，光伏发电是未来可再生能源应用的一种重要方法。光伏并网发电是太阳能大规模开发利用的必然趋势，但光伏并网带来的谐波污染问题使电能质量下降，损耗严重。所以，如何消除光伏并网系统的谐波污染，，提高光伏并网电流波形质量成为光伏并网系统研究的重点内容之一。本文以锦州市某公司城建楼顶分布式30kW光伏并网发电系统为研究对象，分析该系统产生的谐波，据此设计了单周期控制的混合型有源滤波器，消除光伏并网发电系统的产生的谐波。本文主要的研究内容如下：首先，介绍了光伏发电系统的分类、组成以及拓扑结构，深入分析了光伏并网发电系统中逆变器和负载产生的谐波，并推导了SPWM控制光伏逆变器产生的各次谐波含量表达式。其次，分析有源滤波器的结构、原理及相应控制方法。与传统的控制方法相比，单周控制方法不需要对谐波电流进行检测，将检测和控制结合在一起，使控制电路结构简单，易于实现，响应速度快，抗干扰能力强。选用单周控制作为有源滤波器的控制策略，推导单周控制的单相和三相有源滤波器的控制方程表达式并建立数学模型。最后，将单周控制的并联混合型有源滤波器应用到光伏并网发电系统中，设计无源滤波装置和有源滤波器的参数。设计其电路模型，并使用Matlab/Simulink进行仿真，验证了单周控制的并联混合型有源滤波器能对光伏并网系统中谐波进行有效地消除。
[Abstract]:Nowadays, the problem of energy depletion and environmental pollution is becoming more and more serious, photovoltaic power generation is an important method for the application of renewable energy in the future, and grid-connected photovoltaic power generation is an inevitable trend of large-scale development and utilization of solar energy. However, the harmonic pollution caused by photovoltaic grid-connected reduces the power quality and leads to serious loss. Therefore, how to eliminate the harmonic pollution of grid-connected photovoltaic system and improve the quality of grid-connected current waveform has become one of the key issues in the research of grid-connected photovoltaic system. In this paper, the distributed 30kW photovoltaic grid-connected generation system of a company in Jinzhou City is taken as the research object, the harmonic generated by the system is analyzed, and a hybrid active power filter with single cycle control is designed. The main contents of this paper are as follows:. Firstly, the classification, composition and topological structure of photovoltaic power system are introduced. The harmonics generated by inverter and load in photovoltaic grid-connected generation system are deeply analyzed, and the expressions of harmonic content of each order generated by SPWM control photovoltaic inverter are derived. Secondly, the structure, principle and corresponding control method of active power filter are analyzed. Compared with the traditional control method, the one-cycle control method does not need to detect harmonic current, and combines detection and control to make the control circuit structure simple. The one-cycle control is chosen as the control strategy of the active filter, and the expression of the control equation of single-phase and three-phase active filter with one-cycle control is derived and the mathematical model is established. Finally, the single-cycle control shunt hybrid active power filter is applied to photovoltaic grid-connected generation system. The parameters of passive filter and active power filter are designed. The circuit model is designed and simulated by Matlab/Simulink. It is verified that the parallel hybrid active power filter with one cycle control can effectively eliminate the harmonics in photovoltaic grid-connected system.
【学位授予单位】：辽宁工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615

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