直流配电网模型构建及其仿真应用研究
发布时间：2019-05-18 07:15
【摘要】：随着新能源技术的发展、电能质量要求的不断提高以及用电负荷的直流化发展,传统的交流配电方式已经不能满足新时期的发展需要。相比于传统交流配电网,基于柔性直流技术的配电网在供电容量、电能质量、系统可控性、线路成本以及兼容分布式电源性能等方面具有更加优越的性能,成为未来配电网新的发展方向。随着直流配电网项目的深入研究,对于直流配电网模型的规模、可控性以及仿真效率也提出了更高的要求,传统的以电力电子为基础的建模方法已不能完全适用于直流配电网中大规模的仿真研究。本文以直流配电网高效模型的构建及其仿真应用作为主要的研究内容。分析了直流配电网内部的直流潮流特性,确立了直流配电网模型的目标控制参数。基于直流配电网拓扑架构,提出了一种基于直流配电网各变换器“自主”运行和P-U下垂特性相结合的直流配电网协同控制策略;提出了一种新型的直流配电网元器件建模方法,并对所构建的电源、负荷以及直流变压器模型进行仿真分析。该建模方法避免了对直流配电网中电力电子元件的精细建模,最大程度上模拟直流配电网元器件的电气特性,极大减少了计算机仿真系统的计算量,提升了仿真效率,有利于大规模直流配网的仿真分析工作。完成八端直流配电网的组网模型的组建,并对其进行仿真应用。首先将三种理论配电网拓扑结构应用于八端直流配电网的组网模型之中,包括正常稳态运行状态以及N-1故障情况下的仿真。仿真结果表明稳态运行时模型中的潮流分布明确,故障时暂态过程真实显著,验证了所构建的直流配电网模型能适用于直流配电“网级”研究;其次,对所构建的直流配电网模型进行了深化仿真应用,针对直流配电网能量优化问题进行了探讨,建立直流配电网负荷曲线量化指标,以传统能源承担负荷波动程度最小为目标,构建直流配电网优化模型,对配网中储能模块进行运行优化。优化结果显示常规能源所承担的负荷波动量降低,常规能源负荷率有所提高,验证了优化方法的有效性,同时也进一步证明了本文所构建的直流配电网模型的仿真应用价值。
[Abstract]:With the development of new energy technology, the continuous improvement of power quality requirements and the direct development of power load, the traditional AC distribution mode can no longer meet the development needs of the new period. Compared with the traditional AC distribution network, the distribution network based on flexible DC technology has better performance in power supply capacity, power quality, system controllability, line cost and compatible distributed power supply performance. It has become a new development direction of distribution network in the future. With the in-depth study of DC distribution network project, the scale, controllability and simulation efficiency of DC distribution network model are also put forward higher requirements. The traditional modeling method based on power electronics can not be fully applied to large-scale simulation research in DC distribution network. In this paper, the construction of DC distribution network efficient model and its simulation application are taken as the main research content. The DC power flow characteristics in DC distribution network are analyzed, and the target control parameters of DC distribution network model are established. Based on the topology of DC distribution network, a cooperative control strategy of DC distribution network based on the combination of "autonomous" operation of DC distribution network converters and P 鈮，
本文编号：2479784
[Abstract]:With the development of new energy technology, the continuous improvement of power quality requirements and the direct development of power load, the traditional AC distribution mode can no longer meet the development needs of the new period. Compared with the traditional AC distribution network, the distribution network based on flexible DC technology has better performance in power supply capacity, power quality, system controllability, line cost and compatible distributed power supply performance. It has become a new development direction of distribution network in the future. With the in-depth study of DC distribution network project, the scale, controllability and simulation efficiency of DC distribution network model are also put forward higher requirements. The traditional modeling method based on power electronics can not be fully applied to large-scale simulation research in DC distribution network. In this paper, the construction of DC distribution network efficient model and its simulation application are taken as the main research content. The DC power flow characteristics in DC distribution network are analyzed, and the target control parameters of DC distribution network model are established. Based on the topology of DC distribution network, a cooperative control strategy of DC distribution network based on the combination of "autonomous" operation of DC distribution network converters and P 鈮，
本文编号：2479784
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