【作者】 贾岩；

【导师】 张化光；

【作者基本信息】 东北大学 ， 电气工程（专业学位）， 2012， 硕士

【摘要】 随着科技的进步、经济的发展以及对环境越来越高的要求,传统的电力系统已经不能满足人们日益增高的电力需求。为了改善电力市场供需,人们引入了分布式发电技术(Distributed Generation, DG),并迅速渗透入电网配电系统。然而由于分布式发电自身的特性,其发电量不稳定并且很分散,这就导致对分布式发电的管理出现很多难题,如分布式发电与配电网的并网问题,多分布式发电的并联问题,分布式发电的能量管理问题等等,这些问题都严重限制了分布式发电对当前电力需求多样化发挥的积极作用。本文主要研究两个方面内容：分布式发电单元并入微网和多分布式发电单元之间互相并联运行。首先研究了常见的分布式电源的数学模型,在此基础上设计了微电源的基本数学模型。针对不同的分布式发电单元,研究了不同的控制策略,并提出了一种非线性状态反馈方法,从而实现对微电源基本模型的控制。接着研究了分布式发电单元并网连接器的模型设计和下垂控制原理,在此基础上设计了一种分布式发电单元的并网控制器,详细分析了控制器内部电压电流控制回路和外部功率控制回路的设计过程,从而更好地实现分布式发电单元的并网。然后,本文研究了多分布式发电单元并网技术,对分布式发电单元并联时相互之间产生的环流进行详细的分析研究,并提出了多种可行的控制方法,消除环流危害。详细研究了多分布式发电单元并联逆变技术,简单设计了一种适用于多分布式发电单元并联并网并带有有源滤波功能的并网逆变器,并总结性的提出了一种对分布式发电单元能量管理的思路,以便进行后续的研究工作。最后,在PSCAD/EMTDC仿真平台上对本文提出的分布式发电单元并网控制策略进行仿真验证。更多还原

【Abstract】 With the progress of science and technology, the development of economic and the increasingly high demand of the environment, the traditional power system can no longer meet the increasing demand for electricity. In order to improve the supply and the demand of the electricity market, the Distributed Generation (DG) is introduced and quickly absorbed into the power grid distribution system. However, due to the Distributed Generation’s own characteristics, its generating capacity is very unstable and very scattered, which leads to many problems in the management of Distributed Generation, such as Distributed Generation into the grid, Distributed Generations parallel, Distributed Generation energy management and so on. Because of the existing of these problems, the Distributed Generation’s positive affection on the diversification demand for electricity is limited seriously.Distributed Generation unit connected into grid and Distributed Generation units in parallel operation are mainly strudied in this thesis. Firstly, based on the study of common distributed powers and their mathematical models, a basic mathematical model of distributed power is designned. At the same time different control strategies for different Distributed Generation units are researched. A nonlinear control method is presented in order to achieve the control on the basic model of distributed power. With the research on the design of Distributed Generation unit interface model and the principle of sag control made, a kind of Distributed Generation unit controller is designed. The process of the controller internal voltage current control loop and the external power control circuit are analyzed in details, which makes the grid-connected Distributed Generation units realized effectively.Secondly, the research on the technology of Distributed Generation units connecting into grid is made. Detailed analysis of circulation between Distributed Generation units in parallel with each other is conducted. At the same time a variety of possible control methods are made to eliminate the circulation hazards. With detailed research on the inverter technology of Distributed Generation units in parallel, an inverter with a filtering function for Distributed Generation units in parallel grid and grid-connected is simply designed. Meanwhile an idea of Distributed Generation unit energy management in summary is put forward for subsequent research.Finally, simulation analysis on the control strategies of Distributed Generation units and the grid presented in this thesis is made on the PSCAD/EMTDC simulation platform.更多还原