摘要
分布式电源出力以及节点负荷的不确定性,严重影响了孤网模式下微网系统的频率和电压。文章首先考虑发电机有功-频率特性,无功-电压特性以及负荷的频率电压特性,定义微网系统频率和节点电压对有功功率和无功功率的灵敏度;其次,将系统频率偏差和节点电压偏差进行归一化加权处理,得到优化目标函数;然后,以灵敏度较大节点为功率调节节点,采用粒子群优化算法对这些节点的有功功率和无功功率进行优化。在14节点的微网系统中对算法的验证结果表明,当孤网运行的微网系统频率和电压偏差需要调节时,文章所提出的算法通过优化微网节点的功率,能够使系统频率偏差和节点电压偏差减小,实现频率和节点电压的调节。
The distributed power supply system and load of the micro grid are uncertain that aggravates the frequency and voltage quality questions. In this paper, a method of both frequency and voltage regulations based on energy optimization is proposed. The system frequency and the node voltage deviations are minimized by optimizing the power of the nodes. Firstly, the sensitivities between the system frequency/node voltage and active/reactive power are defined considering the active power-frequency and reactive power-voltage characteristics of the generator as well as the frequency and voltage characteristics of the load. Then, the system frequency and the node voltage deviations are normalized and weighted to get the optimization objective function.The nodes with large sensitivity are selected to optimize the active/reactive power utilizing particle swarm optimization algorithm. Finally, a case of the micro grid system with 14 nodes is analyzed,and the results show that the frequency and node voltage deviations will be decreased by optimizing the micro grid node power when the frequency and voltage deviation of the micro grid need to be adjusted. The effectiveness of the proposed method is verified.
作者
雷二涛
马明
王玲
徐柏榆
王朋
Lei Ertao;Ma Ming;Wang Ling;Xu Baiyu;Wang Peng(Electric power research institute of Guangdong Power Grid Co.,Ltd.,Guangzhou 510080,China)
出处
《可再生能源》
CAS
北大核心
2019年第12期1794-1801,共8页
Renewable Energy Resources
基金
中国南方电网公司科技项目（GDKJXM20172804）
关键词
微网
孤网
灵敏度
频率调节
电压调节
micro grid
isolated grid
power sensitivity analysis
frequency regulation
voltage regulation
