摘要
现有微电网的架构在运行期间极少变动,而微源输出功率具有随机性和间歇性,并且微电网负荷的波动较大,这导致系统难以获得全局最优运行状态。首先提出了交直流混合微电网动态架构重组的思想,以减少交流母线和直流母线之间的能量流动,实现交直流混合微电网的优化运行。构思了一种交直流混合微电网架构,分别建立了并网模式和孤岛模式下的数学模型,并以山东某光伏电站的光伏输出功率历史数据及相应的用户负荷数据为例,建立了基于支持向量机的超短期负荷预测模型和光伏输出功率预测模型,并在此基础上通过NSGA-Ⅱ算法动态优化混合微电网的架构。算例结果表明了所提架构重组思想的有效性。
The architecture of existing micro-grid rarely changes during operation;however, the output power from micro-sources is random and intermittent, and the loads of micro-grid fluctuate widely. As a result, the micro-grid system is difficult to obtain the global optimal operation state. In this paper, the thought of dynamic reconfiguration of hybrid AC/DC micro-grid is proposed to reduce the energy flow between AC and DC buses, thus realizing the optimal operation of the hybrid DC/AC micro-grid. First, an architecture of hybrid AC/DC micro-grid is proposed in this paper, and the mathematical models in grid-connected and island modes are established, respectively. Then, the historical data of photovoltaic(PV) output power and the corresponding user load data of a PV power station in Shandong Province is taken as an example, and a very short-term load forecasting model and a PV output power prediction model are established based on support vector machine. On this basis, the architecture of hybrid micro-grid is dynamically optimized through the non-dominated sorting genetic algorithm-Ⅱ(NSGA-Ⅱ). The results of the numerical example show the effectiveness of reconfiguration thought for the proposed architecture.
作者
柴锦
陈阿莲
王瑞琪
王昭鑫
柴东新
CHAI Jin;CHEN Alian;WANG Ruiqi;WANG Zhaoxin;CHAI Dongxin(Engineering Training Center, Shandong University, Jinan 250002, China;School of Control Science and Engineering,Shandong University, Jinan 250061, China;Electric Power Research Institute, State Grid Shandong Electric Power Company,Jinan 250002, China;State Grid Shandong Electric Power Company, Jinan 250001, China;Shandong Power Equipment Co., Ltd, Jinan 250000, China)
出处
《电源学报》
CSCD
北大核心
2019年第2期109-116,共8页
Journal of Power Supply
基金
国家自然科学基金资助项目(51377101
61503216)~~
关键词
交直流混合微电网
NSGA-Ⅱ
负荷预测
动态架构重组
AC/DC hybrid micro-grid
non-dominated sorting genetic algorithm-II(NSGA-Ⅱ)
load forecasting
dyn-amic reconfiguration
