基于变分模态分解法的MMC半桥串联结构微电网微源功率协调控制  

Microsource Power Coordination Control of MMC-MG via Variational Mode Decomposition

作　　者：薛晟 王兴贵[1] 李晓英[1] XUE Sheng;WANG Xinggui;LI Xiaoying(College of Electrical and Information Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu Province,China)

机构地区：[1]兰州理工大学电气工程与信息工程学院,甘肃省兰州市730050

出　　处：《中国电机工程学报》2021年第5期1677-1686,共10页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51967011)。

摘　　要：MMC半桥串联结构微电网孤岛运行时,需独立调节各发电单元的输出功率以提高微源利用率,为此提出一种基于自适应变载波层叠调制的微源输出功率协调控制方法。分析各载波对应发电单元的输出功率,并根据一个周期内的投入时间推导出其平均功率。结合电压波动标准,采用变分模态分解提取随机性微源输出功率的低频分量,以此作为各微源的有效输出功率。根据功率大小调整各发电单元对应载波的等效占空比,实现输出功率自适应控制。仿真及实验结果表明,所提出的功率协调控制策略能有效提取随机性微源功率低频分量,并依据功率大小调节各发电单元输出功率,提高了微源利用率。The power of each generation module(GM) should be adjusted independently to improve the utilization of microsources when modular multilevel converter microgrid operates on islanded. To solve this problem, a coordinated control strategy of microsources output power based on adaptive variable carrier cascade modulation was proposed. The power of each GM which corresponded to the carrier was analyzed, and its average power was deduced according to the input time in a cycle. Combining with the voltage fluctuation standard, the low frequency component of random microsources power was extracted by adaptive variational mode decomposition(VMD), and used as the effective output power of each microsource. The equivalent duty cycle of the corresponding carriers of each GM was adjusted according to the power levels to realize the adaptive control of the output power. The simulation and experimental results show that the power coordination control strategy can adaptively extract the low frequency components of random microsource power, and control the output power of each GM independently according to the power levels, so as to improve the utilization rate of microsource.

关 键 词：模块化多电平变流器 微电网 变载波层叠 功率协调 变分模态分解 

分 类 号：TM46[电气工程—电器]