摘要
传输线路的电压等级不同,线路阻抗的特性也会随之变化。传统分布式电源并网是通过高压传输,线路阻抗近似于纯感性。而微电网由于发电单元距离用户侧较近,因此传输线路电压等级为低压,线路阻抗偏阻性。常有人将其看成纯阻性进行分析和控制,但对比发现,线路阻抗中感性部分对线路影响依然很大。通过借鉴传统分布式电源并网的下垂控制方式,考虑微网传输线路一般为低压这一特性,分析低压线路阻抗对电能传输的影响,从而改进下垂控制方法,并且通过仿真投切实验,对比了传统下垂控制方法和改进后下垂控制方法的输出性能。仿真结果表明,改进后的下垂控制方法能更稳定有效地根据负载变化情况来调节自身输出。
The characteristics of line impedance will vary with the voltage class of transmission line.The traditional distributed power grid connection is through the high voltage transmission line impedance approximates to the pure inductive.Because the generation unit of the microgrid is close to the user side,the voltage grade of the transmission line is low,and the line impedance is partial resistance.It is often regarded as pure resistance for analysis and control,but it is found that the inductive part of the line impedance still has a great influence on the line.In this paper,the droop control method is improved by referring to the traditional droop control mode of the grid-connected distributed power supply and considering the characteristic that the transmission line of the micro grid is usually low voltage,the influence of the impedance of the low voltage line on the power transmission is analyzed,so as to improve the droop control method.The output performance of the traditional droop control method and the improved droop control method are compared through the simulation cut-off experiment.The simulation results show that the improved droop control method can adjust its own output more stably and effectively according to the load changes.
作者
陈莹
义琦
CHEN Ying;YI Qi(Guangxi University Xingjian College of Sciences and Liberal Arts,Nanning 530000,China)
出处
《通信电源技术》
2020年第22期30-33,共4页
Telecom Power Technology
基金
低压光储交流微网实物模拟平台设计与开发(2020KY54015)。
关键词
下垂控制
低压
微网
线路阻抗
分布式电源并网
droop control
low pressure
micro network
line impedance
distributed power grid connection
