低压微电网系统运行控制技术研究与应用

发布时间：2018-10-13 07:11

【摘要】：分布式发电(DG)具有污染少、能源利用率高、安装地点灵活、输配电资源和输电线路损耗少等特有优势,逐渐成为未来大型电网的有力补充和有效支撑,是未来电力系统的发展趋势之一。然而,高渗透的分布式电源接入集中式大电网时,会引起如稳定性、控制和保护等方面的一系列新问题。本文背景主要来源于作者从事的延庆智能微电网建设工程项目,从工程项目的实施方案出发,对延庆微电网项目的运行控制技术进行研究,并对延庆微电网项目的实施和应用做具体的分析。(1).介绍了微电网现状的基本控制策略,并重点分析了基于无互联线的传统下垂特性和在此基础上得改进算法、以及并联逆变器的功率传输特性。(2).进行了三相电压型逆变器理论分析及自适应阻尼策略的研究分析。逆变器是微电网系统的核心,本文重在建立三相电压型逆变器在dq轴下的数学模型,然后介绍逆变器控制单元的自适应阻尼策略设计,仿真验证其可行性和有效性。(3).进行了并联逆变器小信号模型的分析。由于逆变器本身一些参数——输出线路阻抗和负载阻抗,控制参数——下垂增益和功率检测滤波常数等均对系统稳定性产生很大影响。(4).对延庆微电网项目的仿真模型的分析。首先对单个微电源进行仿真,验证其控制方法的正确性;然后对整个系统方案进行验证,并对延庆微电网项目的运行结果进行分析和说明。仿真结果验证了本文提出的策略和微电网系统级控制的有效性和可行性。本文对延庆微电网项目的运行控制技术研究与应用,具有一定的科学意义,具有很强的实际意义和较大的应用价值。
[Abstract]:Distributed generation (DG) has the special advantages of less pollution, high energy efficiency, flexible installation location, less transmission and distribution resources and less transmission line loss, and has gradually become a powerful supplement and effective support for large power grid in the future. It is one of the development trends of power system in the future. However, a series of new problems such as stability, control and protection will arise when high permeable distributed generation is connected to the centralized large power grid. The background of this paper mainly comes from the Yanqing smart microgrid construction project. From the implementation of the project, the operation control technology of Yanqing microgrid project is studied. The implementation and application of Yanqing microgrid project are analyzed. (1). In this paper, the basic control strategy of microgrid is introduced, and the traditional droop characteristic based on no interconnection line and the improved algorithm based on it are analyzed, and the power transmission characteristics of parallel inverter are also discussed. (2). The theoretical analysis and adaptive damping strategy of three-phase voltage source inverter are carried out. Inverter is the core of microgrid system. In this paper, the mathematical model of three-phase voltage source inverter under dq axis is established, and then the adaptive damping strategy design of inverter control unit is introduced, and the feasibility and effectiveness of this model are verified by simulation. (3) The small signal model of parallel inverter is analyzed. Some parameters of the inverter, such as output line impedance and load impedance, control parameters such as sag gain and power detection filter constant, have a great influence on the stability of the system. (4). The simulation model of Yanqing microgrid project is analyzed. At first, a single micro-power supply is simulated to verify the correctness of the control method, and then the whole system scheme is verified, and the operation results of Yanqing micro-grid project are analyzed and explained. Simulation results verify the effectiveness and feasibility of the proposed strategy and microgrid system level control. The research and application of the operation control technology of Yanqing microgrid project is of scientific significance, practical significance and great application value.
【学位授予单位】：华北电力大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM727

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