【作者】 黄晓燕；

【导师】 毛承雄； 陆继明；

【作者基本信息】 华中科技大学 ， 电力系统及其自动化， 2011， 硕士

【摘要】 随着计算机技术和大功率电力电子技术的发展,电力系统中的电能质量敏感型负荷和电能污染型设备的矛盾日益突出,尤以电压凹陷的影响最大。用户电力技术的发展为配电领域的各种问题提供了很好的解决方案。其中,动态电压恢复器(DVR)是一种新型的串联补偿装置,通过向系统注入补偿电压,可以有效补偿电压凹陷、凸起和电压中断等动态电能质量问题,提高系统的供电质量。本文以基于超级电容储能的动态电压恢复器作为研究对象,通过理论分析、Matlab仿真和硬件试验,研究了电压凹陷检测方法、动态电压恢复器的补偿特性、宽范围电压变换方法以及储能型动态电压恢复器的参数设计和控制。实时准确的检测出电压凹陷是对其进行动态补偿的基础。本文提出了一种具有工程实用价值的电压检测方法——求导变换法,通过理论分析和仿真验证了该算法的实时性和精确性。为了突出储能元件对动态电压恢复器补偿效果的重要性,论文针对DVR有无储能环节进行了详细的理论分析和仿真对比,得出DVR应当采用储能元件以保证良好的补偿效果的结论。由于采用了储能元件,本文对储能元件与电力系统的接口问题也进行了探讨,提出了一种宽范围电压变换系统的结构,并进行了软件仿真和硬件试验。最后,本文提出了基于超级电容的储能型动态电压恢复器的主电路结构,重点对主电路的参数设计和系统控制进行了深入的研究,并通过大量的数字仿真,验证了所提出的检测方法和控制策略的有效性。更多还原

【Abstract】 With the developments of computer technology and power electronics, the conflicts between power-quality-sensitive loads and power quality contaminated instruments become more and more considerable, which make concentrated reflection on voltage sags. Custom power technology can provide good solutions for these problems in power distribution system. Among them, dynamic voltage restorer (DVR) is a novel series-connected power electronics device. By injecting compensation voltage, it can compensates for all kinds of dynamic power quality issues such as sags, swells and interruption, thereby enhancing the quality of power supplied to sensitive loads.The research object of this thesis is dynamic voltage restorer based on super capacitor. Through theoretic analysis, Matlab simulation and experiments, the voltage detection, compensation characteristics of DVR, wide-range electrical transformation and design of DVR are studied in this paper.A fast and accurate voltage detection method is the base of dynamic compensation. This paper proposes a novel voltage detection method, which is derivation transformation method. Analysis and simulation verify its accuracy and fast speed. In order to emphasize the influence of energy storage units on DVR’s compensation, this paper makes a comparison between DVRs with and without energy storage unit, and concludes that DVR should have an energy storage unit to make sure good compensation effect. Since the energy storage unit is necessary, the issue on its interface with power system is discussed, and a novel wide range electrical transformation system is proposed. Software simulation and hardware tests are implemented to verify the effectiveness of the proposed structure. Then, this paper presents the structure of DVR based on super capacitor energy storage, and system design and control of the DVR are studied in detail. Finally, a large number of digital simulations show that the proposed detection method and control strategy are effective.更多还原