逆变型分布式电源的建模及其对配电网故障特性的影响分析

发布时间：2018-07-01 20:40

本文选题：分布式电源 + 故障分析　；参考：《天津大学》2014年硕士论文

【摘要】：随着传统化石能源的逐步枯竭,以光伏电站和风力电站为代表的分布式电源(Distributed Generator,DG)技术得到越来越广泛的应用,成为二十一世纪电力工业的主要发展方向。然而,DG的接入将改变传统配电网单电源集中式的供电结构,使其由传统的功率单向流动的辐射型网络转变为功率双向流动的多源网络。这种结构的改变不仅对配电网的无功电压特性产生重大影响,而且也将不可避免的对传统的继电保护造成影响。因此,系统的分析DG的接入对配电网故障特性的影响,不论是对原有保护原理的改进还是对新的保护原理的提出,都具有十分重要的意义。本文首先在查阅大量文献资料以及对逆变型DG(Inverter Interfaced DG,IIDG)生产厂家实地调研的基础上,建立了符合实际情况的带低电压穿越特性(Low Voltage Ride Through,LVRT)的IIDG模型,并给出了IIDG内部控制参数及滤波参数的理论计算方法。之后,在PSCAD仿真平台中进行了含IIDG的配电网的故障仿真,分析总结了IIDG的接入对配电网暂态和稳态故障特性的影响。本文还提出了含不同数量、不同控制策略的IIDG的配电网的短路电流计算方法,并在此方法的基础上总结了短路电流随故障类型、故障点位置、并网点位置、IIDG容量以及IIDG运行状态等因素变化的一般规律,为含IIDG的配电网的保护原理的改进提供理论依据。
[Abstract]:With the gradual depletion of traditional fossil energy, distributed generator DG (distributed Generator DG) technology, represented by photovoltaic and wind power stations, has been more and more widely used, and has become the main development direction of power industry in the 21 century. However, the access of DG will change the centralized power supply structure of single power supply in traditional distribution network, and transform it from a radiative network with unidirectional power flow to a multi-source network with two-way power flow. The change of the structure not only has a great influence on the reactive power and voltage characteristics of the distribution network, but also will inevitably affect the traditional relay protection. Therefore, it is of great significance to analyze the influence of DG access on the fault characteristics of distribution network, not only for the improvement of the original protection principle but also for the new protection principle. On the basis of consulting a large amount of literature and investigating the Inverter interfaced DGG (Inverter interfaced DGN IIDG) manufacturers, an IIDG model with low Voltage Ride Throught LVRT (low Voltage Ride Throught LVRT) is established in this paper. The theoretical calculation method of IIDG internal control parameters and filter parameters is also given. Then, the fault simulation of distribution network with IIDG is carried out on PSCAD simulation platform, and the influence of IIDG access on transient and steady-state fault characteristics of distribution network is analyzed and summarized. The short circuit current calculation method of IIDG distribution network with different quantity and different control strategy is also proposed in this paper. Based on this method, the short circuit current with fault type, fault point location is summarized. The general law of the change of IIDG capacity and IIDG operation state is given, which provides a theoretical basis for the improvement of the protection principle of distribution network with IIDG.
【学位授予单位】：天津大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM464;TM743;TM711

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