【作者】 王瑞；

【导师】 郑琼林；

【作者基本信息】 北京交通大学 ， 电力电子与电力传动， 2008， 硕士

【摘要】 分布式发电技术是一种新型的、具有广阔发展前景的发电和能源综合利用方式。并网分布式发电系统的无功控制将对电网产生重要影响。本文的研究工作主要包括:首先,研究了分布式发电对配电网电压和网损的影响。运用潮流程序计算分布式发电接入配电网前后的电压分布,结合分布式电源出力和接入位置的变化,较为全面地总结了分布式电源对配电网电压的影响规律。通过对理想配电网模型以及实际算例的分析,针对分布式电源的容量、接入位置等因素,研究了分布式电源对配电网网络损耗的影响规律。其次,提出了基于遗传算法的含分布式发电的配电网无功优化算法。构建了包含分布式发电系统的配电网无功优化数学模型,充分考虑了网损最小和节点电压的约束,采用遗传算法对分布式发电的无功功率给定进行了优化。通过算例仿真结果,说明所设计的优化算法在减少功率损耗和提高电压质量上的有效性和正确性。最后,建立了分布式发电系统并网逆变器的数学模型,研究了其有功、无功解耦控制方法,可在容量范围内实现无功功率的独立调节,在此方案的基础上进行了仿真和实验分析。研究表明,分布式发电系统的无功控制方法有利于充分发挥分布式发电的积极作用,减轻分布式发电对配电网的不利影响,使电力系统更加高效、可靠地运行。图45幅,表29个,参考文献39篇。更多还原

【Abstract】 Distributed generation (DG) is a new technology with nice prospect, which is always connected with distribution system. So the research on reactive power control of distributed generation system is valuable in theory and in practice. The content of this paper are arranged as follows:Firstly, the impacts of DG on distribution network such as loss and node voltages, is researched. Power flow method is applied to obtain the voltage profile before and after interconnecting DG sources. The general operation guideline is revealed after several simulations where the DG sources’ output and location change. Based on ideal and practical models of distribution network, the author concludes the DG influence on power loss, considering two related factors: the DG sources’ capacity and location condition.Secondly, a reactive power optimization algorithm including DG sources based on genetic algorithm is proposed. The corresponding particular model is built which takes into the minimum network loss and node voltage constraint. Genetic algorithm is used in reactive power optimization. The simulation examples show that the validity and effectiveness of the proposed algorithm in reducing network losses and improving the voltage profiles.Lastly, the grid-connected inverter of distributed generation model is set up. To achieve the reactive power regulation independently, the active and reactive power decoupled control is researched. Then the simulation and experiment results were also presented.The research on reactive power control of distributed generation is of certain value to the DG application in practice. The purpose is to achieve the positive applications, lighten the negative affection of DG and make the system more efficient and reliable.更多还原