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题名	微电网中微源运行模式的无缝切换技术研究; 微电网中微源运行模式的无缝切换技术研究
作者	1黄胜利,电工研究所
学位类别	博士
答辩日期	2009-01-06
授予单位	中国科学院电工研究所
导师	1孔力,电工研究所
关键词	分布式发电 微电网 无缝切换 主动孤岛 SCR强制关断 Distributed generation, MicroGrid, Seamless transfer, Intentional islanding, SCR forced turnoff
其他题名	微电网中微源运行模式的无缝切换技术研究
中文摘要	从国内外分布式发电研究发展趋势看，微电网已经成为未来分布式发电大规模普及应用的重要组织形式，并得到了广泛的共识，成为电力系统和新能源领域的研究热点之一。 微电网一个重要的功能是并网和孤岛两种稳态运行模式间能够实现无缝切换，其出发点在于维持微电网内重要敏感负荷的正常电力供应，这种基于对电力用户供电安全考虑的做法符合目前电力系统发展的方向和服务宗旨。本课题针对由逆变型微源组成的微电网系统，提出了无缝切换技术的实现方案，主要研究内容如下： （1）提出了具有无缝切换功能的微源拓扑结构，从理论上推导了LCL滤波器的选型标准和不对称运行情况下直流母线支撑电容的参数选择方法，直流母线支撑电容的选取对于不对称系统能否正常运行具有决定性作用。 （2）详细推导了孤岛运行模式下微源在三相静止坐标系abc下的开关函数模型和状态空间平均模型，并利用Park变换，建立起相应的dqo模型。接着分别阐述了微源在abc和dqo两种坐标系下的控制方法，在对该两种控制方法进行比较分析之后，提出了基于dqo坐标系下对称微源和不对称微源双环控制方案，并通过计算机仿真和试验进行了验证。 （3）阐述了微源在LCL滤波器结构下的并网运行理论，指出了该结构下应用现行的电压源和电流源两种并网控制策略的缺点，提出改进的并网控制策略，并通过计算机仿真进行了验证。 （4）提出了微源运行模式进行无缝切换的条件和欲达到的目标。在分别对单相和三相微源离网控制进行比较分析的基础上，针对三相微源提出了SCR强制关断策略，从理论上分析了强制关断实施的方法以及三相静态开关关断时间与滤波电容电压幅值的调节范围及并网电流之间的数量关系。 （5）利用SCR强制关断策略实现了三相微源的主动孤岛控制，同时提出了重新并网控制方法，基于此提出了微源运行模式的无缝切换技术实现方案，并通过计算机仿真和试验进行了验证。 （6）在成功实现单台微源运行模式的无缝切换之后，提出了微电网系统的无缝切换技术实现方案。 Viewing the development trends of distributed generation in domestic and foreign, MicroGrid has becoming the important integrating approach for widespread use of distributed energy resources, and which has accepted a broad consensus, so becomes one of the research focuses in the fields of electric power systems and new energy. A key function of MicroGrid is seamless transfer between grid-tied and off-grid modes, which aims to ensure the uninterruptible power service for electricity users. This consideration for customer’ reliable power provision is according to the development goal and service purpose of power system. Aiming at MicroGrid composed of inverter-based Microsources (MS), this dissertation introduces the control strategy for seamless transfer. The main research contents are introduced as bellow: (1) Proposes the topology of MS capable of seamless transfer, and analyses theoretically the design methods of LCL filter and the split capacitor under unbalanced loads, which is critical to the normal work of a three-phase four-wire system. (2) Deduces the switching function model and the state space average model for MS based on VSI in the a-b-c stationary coordinate particularly, and the corresponding models in d-q-o coordinate are built using Park transformation. The control schemes for VSI in a-b-c and d-q-o coordinates are described respectively, after comparison between these two control methods, the double-loops control strategy for balanced and unbalanced MS are introduced, which are verified by computer simulation and experiments subsequently. (3) Describes the control algorithm for grid-connected inverter based on LCL structure filter, and points out the drawbacks of available voltage control and current control techniques, so the approved control algorithm for grid-tied operation is presented. (4) The condition for carrying out seamless transfer and the expected objects are Proposed. In comparison to single-phase MS, SCR forced turnoff principle is proposed for three-phase MS. the implementation method for forced turnoff, and the mathematical relation of falling time vs. the regulation amplitude for filter capacitor voltage and the grid currents are deduces. (5) Intentional islanding is achieved based on SCR forced turnoff principle, meanwhile the algorithm for reconnection to the grid is introduced, after that seamless transfer control strategy is presented, which is verified by both simulation and experimental results. (6) After seamless transfer is accomplished successfully on individual MS, the implementation scheme for MicroGrid system composed of much MS is discussed.
语种	中文
公开日期	2010-10-18
页码	118
分类号	TM1;TM921
内容类型	学位论文
源URL	[http://ir.iee.ac.cn/handle/311042/6766]
专题	电工研究所_其他部门_其他部门_博士学位论文
推荐引用方式 GB/T 7714	1黄胜利,电工研究所. 微电网中微源运行模式的无缝切换技术研究, 微电网中微源运行模式的无缝切换技术研究[D]. 中国科学院电工研究所. 2009.

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