基于改进MFAC的交直流微电网分布式二次控制
Distributed Secondary Control of Hybrid AC/DC Microgrid Based on Improved Model-free Adaptive Control
杨畅 1郑涛 1李鹏宇 1卜鸣1
作者信息
- 1. 西安交通大学电气工程学院,陕西省西安市 710049
- 折叠
摘要
针对现有交直流微电网分布式二次控制(distributed secondary control,DSC)受分布式电源一次控制参数影响较大、通信拓扑结构复杂、二次控制参数难以整定等问题,提出基于改进MFAC的交直流微电网DSC(MFAC-DSC),利用分布式电源的历史采样数据在线估计其动态线性化参数,解决了传统方法受一次控制参数影响较大的问题;通过优化DSC的通信结构和控制策略,避免了互联变流器参与二次控制通信,解决了互联变流器通信失效影响DSC的问题;推导了 MFAC-DSC系统收敛性,给出了稳定收敛条件.基于交直流微电网实验平台在多种工况下验证了 MFAC-DSC的可行性,与传统的DSC策略的对比结果表明:MFAC-DSC方法有效减少分布式电源下垂系数变化带来的功率波动,保证下垂系数有更大的调节范围,同时解决了互联变流器通信失效造成的控制失效和母线电压偏移等问题.
Abstract
To solve the problems that the existing distributed secondary control(DSC)of AC/DC microgrid is greatly influenced by the parameters of the primary control,the communication topology of DSC is complicated,and the secondary control parameters are difficult to set,etc.,DSC of hybrid AC/DC microgrid based on improved MFAC(MFAC-DSC)is proposed.In this paper,the dynamic linearization parameters of distributed generation are estimated online by using the historical sampling data,and the traditional DSC's problem of being easily affected by the primary control parameters is solved.In order to deal with the issue of the interlinking converter communication failure,the communication network and control strategy of DSC is optimized through no communication interlinking converter.Besides,the convergence of the MFAC-DSC control system is derived,and the stable convergence condition is given.Based on a real AC/DC microgrid experimental platform,the feasibility of MFAC-DSC is verified under various operating conditions.Compared with the traditional DSC strategy,the MFAC-DSC method can effectively reduce the power fluctuation caused by the change of distributed generation's droop coefficient,and the droop coefficient can be adjusted on a larger scale.Meanwhile,it solves the problems of control failure and bus voltage offset caused by the interlinking converter communication failure.
关键词
交直流微电网/无模型自适应控制/分布式二次控制/功率分配Key words
AC/DC microgrid/model-free adaptive control(MFAC)/distributed secondary control/power distribution引用本文复制引用
基金项目
陕西省重点研发计划项目(2019ZDLGY18-06)
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据