基于Markov链的MMC-MG并网微源功率分配控制策略  

Microsource Power Distribution Control Strategy for MMC-MG Grid-connected Based on Markov Chain

作　　者：王海亮[1] 王兴贵[1] 薛晟 李晓英[1] WANG Hailiang;WANG Xinggui;XUE Sheng;LI Xiaoying(School of Electrical Engineering 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：《电网技术》2022年第9期3651-3661,共11页Power System Technology

基　　金：国家自然科学基金项目(51967011);甘肃省自然科学基金项目(21JR7RA207)。

摘　　要：为提高模块化多电平变换器(modular multilevel converter,MMC)半桥串联结构微电网并网运行时微源的利用率,提出了一种基于Markov链的功率分配控制方法。首先,分析了发电模块(generation module,GM)的平均传输功率。研究了循环映射的载波层叠脉宽调制技术;然后,以微源最大输出功率作为主要因素得到各GM的功率分配系数。同时采用Markov链对微源功率增长趋势进行预测,并根据预测结果对分配系数进行修正;此外,由系统功率需求与分配系数得到各GM输出功率参考值,将其作为选择循环映射关系的有效依据;最后,通过GM实际输出功率与其参考值的误差调整各发电单元对应载波的占空比,实现微源输出功率的分配控制。仿真结果表明,所提功率分配方法能有效实现GM的独立控制,提高微源利用率。In order to improve the utilization of micro sources when the modular multilevel converter(MMC)microgrid operates in grid-connected mode,a power distribution control based on the Markov chain is proposed.Firstly,the average transmission power of each generation module(GM) is analyzed.The cyclic mapping carrier disposition sinusoidal pulse width modulation(SPWM) is studied.Then,the maximum output power of the micro-source is taken as the main factor to determine the power distribution coefficient.Meanwhile,the markov chain is used for predicting the future power trend of the micro source,and the distribution coefficient is modified according to the prediction state.In addition,the output power reference values of the GM are obtained from the distribution coefficient and the system output power demand,which is used as an effective basis for selecting the mapping relationship.Finally,through the error between the actual output power of the GM and its reference value,the duty cycle of the corresponding carrier of each power generation unit is adjusted to realize the distribution control of micro source output power.The simulation results show that the proposed power allocation can effectively realize the independent control of the GM and improve the utilization of micro source.

关 键 词：微电网 MARKOV链 功率分配 最大输出功率 独立控制 

分 类 号：TM721[电气工程—电力系统及自动化]