基于载波频率的纹波分析直流微网阻抗检测及均流控制  

An Enhance Droop Control Method With Line Impedance Detection Based on Carrier Frequency Ripple Analysis in DC Microgrid

作　　者：朱相臣 赵晋斌 曾国辉[2] 张云飞 ZHU Xiangchen;ZHAO Jinbin;ZENG Guohui;ZHANG Yunfei(College of Power Engineering,Shanghai University of Electric Power,Yangpu District,Shanghai 200090,China;College of electronic and electrical engineering,Shanghai University of Engineering Science,Songjiang District,Shanghai 201620,China)

机构地区：[1]上海电力大学电气工程学院,上海市杨浦区200090 [2]上海工程技术大学电子电气工程学院,上海市松江区201620

出　　处：《中国电机工程学报》2020年第21期6894-6902,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51777120)。

摘　　要：在直流微网运行中,负荷均匀分配有利于系统稳定运行,延长系统使用寿命。为了解决直流微电网中线路阻抗对传统下垂控制的影响,基于直流微电网系统结构特点,文章提出一种基于变换器输出电压电流纹波分析的阻抗检测方法。电流高频谐波分量主要来自于开关器件的通断频率,通过分析变换器输出电压电流的脉冲宽度调制(pulse width modulation,PWM)信号载波基频谐波分量,获得阻抗信息,进而对下垂控制进行补偿,并将该补偿法推广至多台变换器并联的应用场景。所提方法不直接对控制系统进行操作,因此,对电能质量无影响。最后,通过RT-LAB半实物仿真实验平台,验证所提方法在正常工况下的可行性,以及在通信中断、负荷突变等情况下的有效性。In the operation of DC micro grid, the uniform load distribution is beneficial to the stable operation of the system and prolongs the service life of the system. In order to solve the influence of line resistance on traditional droop control in dc micro-grid, a resistance detection method based on ripple analysis was proposed based on the structural characteristics of the dc micro-grid system. The high-frequency harmonic component of microgrid output current and voltage is mainly from the transistor switching frequency. By analyze the high-frequency harmonic component of the voltage and current detected by the converter, the impedance information was obtained, and then the droop control was compensated base on it. In this paper, the compensation method was extended to the application of multiple devices in parallel. This method does not directly operate the system, so it had done no harm to the power quality. Finally, the feasibility of the proposed method in normal working conditions and its effectiveness in the case of communication interruption, load mutation were verified by RT-LAB hardware in loop simulation.

关 键 词：直流微电网 阻抗检测 纹波分析 负荷分配 

分 类 号：TM73[电气工程—电力系统及自动化]