微电网自适应保护方法研究及其多Agent系统设计

发布时间：2018-03-29 02:13

本文选题：微电网　切入点：继电保护　出处：《燕山大学》2014年硕士论文

【摘要】：负荷的持续增长、能源问题、环保问题以及用户电能质量的高要求，成为世界各国电力工业共同面临的严峻挑战。微电网具有灵活、智能的特点，可以降低馈线损耗、增加本地供电可靠性、提高能源利用的效率，在解决上述问题上具有极大优势。但是，微电网的结构特征对继电保护提出了新的挑战。微电网中分布式电源种类繁多、储能装置形式多样，使得微电网不同运行方式、不同线路上故障电流分布差异很大，尤其是并网和孤岛两种模式下故障电流相差悬殊。微电网用户端发电设备即插即用，并网模式与孤岛模式随机切换，使得微电网拓扑结构灵活多变。这些都要求保护系统能够相应地做出调整以满足微电网的变化。为满足微电网对保护系统自治性和自适应性的要求，本文在分析分布式电源及微电网故障特性的基础上，提出了一种主从结构、面向区域信息集中决策的微电网自适应保护系统架构。该系统采用基于本地信息的主保护和基于区域信息的后备保护方法，，由微电网中央保护决策单元和本地保护测控单元构成。中央保护决策单元从本地保护测控单元收集微电网全局信息，根据微电网运行状态实时做出决策，调整本地保护方案并承担后备保护。此外，本文还应用多代理技术设计了微电网自适应保护多代理系统，为微电网保护系统提供高智能的软件体系结构。详细设计了系统中各代理的任务划分和主保护自适应整定、后备保护在线实施的代理协作过程。基于典型微电网结构描述了微电网自适应保护多代理系统的工作流程，表明该系统可根据微电网运行模式动态在线制定保护策略，合理解决并网、孤岛模式的保护协调问题和主保护、后备保护的配合问题。
[Abstract]:The continuous growth of load, energy problems, environmental protection problems and the high requirements of power quality for users have become the severe challenges facing the power industry in the world. Microgrid has the characteristics of flexibility and intelligence, which can reduce the feeder loss. Increasing the reliability of local power supply and improving the efficiency of energy utilization have great advantages in solving the above problems. However, the structural characteristics of microgrid pose a new challenge to relay protection. Because of the variety of energy storage devices, the distribution of fault current on different lines varies greatly with different operation modes of microgrid, especially the difference of fault current between grid-connected and isolated island mode. Due to random switching between grid-connected mode and islanding mode, the topology of microgrid is flexible and changeable, which requires that the protection system can be adjusted accordingly to meet the change of microgrid. In order to meet the requirement of autonomous and adaptive protection system in microgrid, this paper presents a master-slave structure based on the analysis of the fault characteristics of distributed generation and microgrid. The architecture of adaptive protection system of microgrid for regional information centralized decision is presented, which adopts local information based primary protection and regional information based backup protection. It is composed of central protection decision-making unit and local protection measurement and control unit. The central protection decision-making unit collects global information from local protection and measurement and control unit, and makes real-time decision according to the operation state of microgrid. Adjust local protection programs and assume backup protection. In addition, an adaptive protection multi-agent system for microgrid is designed by using multi-agent technology. To provide a high intelligent software architecture for microgrid protection system, the task partition of each agent and the adaptive setting of main protection in the system are designed in detail. Based on typical microgrid structure, the workflow of microgrid adaptive protection multi-agent system is described, which indicates that the system can dynamically formulate protection strategy according to microgrid operation mode. Reasonable solution to the problems of grid connection, islanding protection coordination, main protection and backup protection.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM727

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