含分布式风力发电的综合负荷建模研究及其平台开发

发布时间：2018-06-16 21:57

本文选题：电力系统 + 负荷建模　；参考：《湖南大学》2015年硕士论文

【摘要】：分布式电源因其投资少、损耗低、清洁环保、系统可靠性高等优点在世界范围内迅速发展,成为了传统大规模集中发电模式的有力补充。其中,风力发电作为一种洁净的可再生能源已成为最成熟、最具规模化开发条件和商业化发展前景的新能源技术之一。分布式的风电场通常分散在110k V及以下电压等级并网,使得电网的潮流流向及区域负荷特性发生变化,故而不可避免地影响配电网综合负荷的等效特性。从负荷建模研究的角度出发,研究风力发电电源并网后综合负荷特性及其等效模型,是高难度的电网仿真计算对负荷建模的必然要求。在众多种类的风力发电机组中,双馈感应发电机DFIG(Doubly-Fed Induction Generator)因其体积小、成本低等优点得到了全球众多风电设备制造商、运营商的青睐,成为当前风力发电的主要选择。本文在研究DFIG系统结构、功率特性及控制原理的基础上,构建了一种简化双向变流器两侧电气关系的DFIG机电暂态等效描述模型,不同电压扰动条件下的仿真实验验证了该模型结构简单、参数相对较少、实用性强,具有很好的描述能力与泛化能力。在上述DFIG机电暂态等效描述模型基础上,深入研究其接入配电网后对综合负荷特性的影响,构建含DFIG的配电网广义综合负荷模型(DFIG-Generalized Synt hesis Load Model,D-GSLM)——即将DFIG机电暂态模型与考虑配电网的综合负荷模型(Synthesis Load Model,SLM)有机结合。采集不同风力发电容量下的暂态仿真实验数据,从拟合效果、综合残差及模型准确度三个方面多角度比较了不同分布式电源渗透率下SLM模型与D-GSLM模型的描述能力。综合上述工作并结合已有的几种典型的综合负荷模型,设计并实现了含多种分布式电源的负荷建模平台,实现了负荷建模与模型评估的一体化,该系统采用C#与C语言混合编程,易于操作、交互性好、扩展性强,为研究分布式电源的接入对配电网综合负荷模型的影响提供了完整的数字仿真实验手段。
[Abstract]:Because of its advantages of low investment, low loss, clean and environmental protection, high system reliability and so on, distributed power generation has developed rapidly in the world, and has become a powerful supplement to the traditional large-scale centralized power generation mode. Among them, wind power generation as a clean renewable energy has become the most mature, the most large-scale development conditions and commercial development prospects of one of the new energy technologies. Distributed wind farms are usually distributed in 110kV and below voltage levels, which make the power flow direction and regional load characteristics change, so it inevitably affects the equivalent characteristics of the comprehensive load of distribution network. From the point of view of load modeling, it is necessary to study the integrated load characteristics and their equivalent models after wind power generation is connected to grid. Among all kinds of wind power generators, DFIGGG Doubly-Fed production Generator (DFIGG) has been favored by many wind power equipment manufacturers and operators all over the world because of its small size and low cost, and has become the main choice of wind power generation. On the basis of studying the structure, power characteristic and control principle of DFIG system, a new equivalent description model of electromechanical transient of DFIG is constructed, which simplifies the electric relationship between two sides of bidirectional converter. The simulation results under different voltage disturbances show that the model has the advantages of simple structure, relatively few parameters, strong practicability and good ability to describe and generalize. On the basis of the equivalent description model of DFIG electromechanical transient, the influence of DFIG on the comprehensive load characteristics after it is connected to the distribution network is deeply studied. The generalized integrated load model of distribution network with DFIG is constructed. DFIG-Generalized Synt hesis load Model-D-GSLMM-that is the organic combination of DFIG-Generalized Synt hesis load Model D-GSLM that is to say, the DFIG electromechanical transient model is combined with the synthesis load model considering the distribution network. The transient simulation experiment data of different wind power generation capacity are collected. The description ability of SLM model and D-GSLM model under different permeability of distributed generation are compared from three aspects: fitting effect, comprehensive residual error and model accuracy. Based on the above work and several typical integrated load models, a load modeling platform with a variety of distributed power sources is designed and implemented, and the integration of load modeling and model evaluation is realized. This system uses C # and C language mixed programming, easy to operate, good interaction and strong expansibility. It provides a complete digital simulation experimental means for studying the influence of distributed power access on the integrated load model of distribution network.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM614

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