含多DG配电网继电保护研究

发布时间：2018-03-17 10:31

本文选题：逆变型分布式电源　切入点：配电网　出处：《兰州理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,随着化石燃料的日渐枯竭、生态环境不断恶化,分布式电源以其清洁高效等特点而得到迅猛发展。但分布式电源接入配电网影响了保护装置的准确动作,使各保护之间的配合性降低,给配电网带来严重的影响。因此,针对分布式电源接入配电网对保护系统影响的问题,制定合理的解决方案具有重要的现实意义。本文主要进行了以下四个方面的课题研究工作:(1)首先介绍了分布式电源的分类以及运行方式,针对逆变型分布式电源,分析了逆变型分布式电源的工作原理、控制策略、正弦波脉冲宽度调制技术(SPWM技术),并设计了PQ控制的逆变型分布式电源模型,通过仿真软件PSCAD/EMTDC仿真验证了模型的合理性。(2)针对分布式电源的接入位置、注入容量对传统三段式电流保护的影响进行了理论分析,通过算例推导,得出了当故障点相对DG的位置不同时,DG的注入容量对故障电流的影响关系。在PSCAD/EMTDC软件平台搭建10kV配电网模型,针对故障点位置的不同对系统保护装置的影响进行了仿真验证。(3)通过上述理论分析和仿真实验,本文提出了基于线路两端测量阻抗变化的配电网自适应保护算法,该保护算法不受分布式电源容量以及接入位置的影响,利用PSCAD/EMRDC搭建了含多逆变型分布式电源的配电网模型,通过仿真分析验证了该保护算法的有效性。(4)基于电网智能化的发展趋势,本文设计了多Agent基于两端测量阻抗算法的智能化保护系统,通过对各Agent进行任务规划,利用各Agent之间的信息交互,相互协作配合,解决含多分布式电源配电网中各种故障问题,实现对配电网系统的智能保护。
[Abstract]:In recent years, with the depletion of fossil fuels and the deterioration of ecological environment, distributed power supply (DG) has been developed rapidly because of its clean and efficient characteristics. However, the accurate operation of protective devices is affected by the access of DG to distribution network. In order to reduce the cooperation among the protection systems, the distribution network will be seriously affected. Therefore, in view of the impact of distributed power supply access to the distribution network on the protection system, It is of great practical significance to formulate a reasonable solution. In this paper, the following four aspects of research work are mainly carried out. Firstly, the classification and operation mode of distributed power generation are introduced, aiming at inverter distributed power generation. The working principle, control strategy, sine wave pulse width modulation technology and SPWM technology of the inverter distributed power supply are analyzed, and the PQ control model of the inverter distributed power supply is designed. The rationality of the model is verified by the simulation software PSCAD/EMTDC. (2) the influence of injection capacity on the traditional three-segment current protection is theoretically analyzed in view of the access position of distributed power supply. The influence of the injection capacity of DG on the fault current is obtained when the location of the fault point is different from DG. The 10kV distribution network model is built on the PSCAD/EMTDC software platform. Based on the above theoretical analysis and simulation experiments, this paper presents an adaptive protection algorithm for distribution network based on the variation of impedance measurement at both ends of the transmission line. The protection algorithm is not affected by the capacity and access location of distributed power supply. A distribution network model with multi-inverter distributed generation is built by using PSCAD/EMRDC. The effectiveness of the proposed protection algorithm is verified by simulation analysis. (4) based on the development trend of intelligent power network, this paper designs an intelligent protection system based on two-end impedance measurement algorithm for multiple Agent, and carries out task planning for each Agent. By using the information exchange and cooperation among the Agent to solve the problems of various faults in the distribution network with multi-distributed generation, the intelligent protection of the distribution network system is realized.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM77

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