摘要
针对直流微电网系统中的直流母线低次谐波电流问题,该文提出一种基于分数阶电容的低次谐波电流抑制方法。该方法可实现对任意次或组合次的低次谐波的抑制,理论上可实现低次谐波电流的完全抑制。为获得理想的参考信息,提出一种零点寻找策略及波形变换方法,改善了分数阶电容的输出波形质量。含分数阶电容的谐波抑制支路并联于直流母线上,可热拔插,安装方便,不影响系统的动态性能。且脉动功率仅在逆变器输出侧和谐波抑制支路之间流动对前级变流器以及电源的影响小。同时,分数阶电容支路可软开关操作,损耗低。此外,分数阶电容支路中电容与母线电容复用,拓扑结构简洁,与已有方法相比,系统的成本降低,功率密度显著提高。
Aiming at the problem of low-order harmonic currents in micro-grid system,this paper proposes a low-order harmonic currents suppression method based on fractional-order capacitors(FOC).This method can achieve the suppression of any order or combination of low-order harmonics and theoretically can achieve complete suppression of low-order harmonic currents.In order to obtain the ideal reference voltage,a zero point hunting strategy is proposed to improve the quality of the output waveform of FOC.The harmonic suppression branch with FOC is connected in parallel to the DC bus,hot-swappable,easy to install,and does not affect the dynamic performance of the system.Meanwhile,the pulsating power only flows between the output side of the inverter and the harmonic suppression branch so that it has little effect on the front-end converter and the power supply.At the same time,the FOC branch can be soft-switched and has low loss.In addition,the capacitor in the fractional-order capacitor branch is multiplexed with the bus capacitor,and the topology is simple.Compared with the existing method,the cost of the system is reduced and the power density is significantly improved.
作者
林智乐
张靖雨
何良宗
LIN Zhile;ZHANG Jingyu;HE Liangzong(Department of Instrumental Electrical Engineering,Xiamen University,Xiamen 361005,Fujian Province,China)
出处
《中国电机工程学报》
EI
CSCD
北大核心
2022年第24期8921-8932,共12页
Proceedings of the CSEE
基金
国家自然科学基金面上项目(62071406)。
关键词
微电网系统
低次谐波电流
谐波抑制
分数阶电容
零点寻找
micro-grid system
low-order harmonic currents
harmonic suppression
fractional-order capacitor(FOC)
zero point hunting
