含LLC滤波的直流微电网非线性系统控制与仿真  

Study on Control and Simulation of DC Microgrid Nonlinear System with LLC Filtering

作　　者：高卫宏 侯强 GAO Weihong;HOU Qiang(Shanxi Jinzhong Institute of Technology,Jinzhong,Shanxi 030600,China)

机构地区：[1]山西晋中理工学院,山西晋中030600

出　　处：《山西电力》2023年第4期19-23,共5页Shanxi Electric Power

摘　　要：谐波扰动在交流电网中得到了很好的研究,但在直流电网中尚未得到充分研究。为提高直流微电网的电能质量管理,提出了一种非线性干扰观测器前馈控制下的双闭环控制LLC滤波系统,滤除直流电网自身纹波和非线性电力电子变换器带来的谐波,将直流母线扰动控制在一定区间内。通过在MATLAB中搭建仿真实验模型,与3种不同控制手段下的谐波含量进行对比,扰动范围从2.55%~5.76%降低到0.04%~1.28%,降低了2.51%~4.48%;谐波畸变率由1.80%降低到0.42%,降低了1.38%。证明所提出的控制策略是有效的,为直流微电网保证电能质量提供了新的方法。Harmonic disturbance has been well studied in AC power grid,but not fully studied in DC power grid.In order to improve power quality management of DC microgrid,an LLC filtering system with double closed-loop control under feedforward control of Nonlinear Disturbance Observer is proposed.And by filtering out the harmonics caused by the ripple of the DC grid itself and the nonlinear power electronic converter,the disturbance of DC bus is controlled within a certain range.Based on construction of the simulation experiment model in MATLAB and a comparison of the harmonic content with three different control methods,the range of disturbance is reduced by 2.51~4.48 from 2.55~5.76 to 0.04~1.28.The harmonic distortion rate is reduced by 1.38 from 1.80 to 0.42.It is proved that the control strategy proposed in this paper is effective and it provides a new method to guarantee the power quality of DC microgrid.

关 键 词：电力电子变换器 电能质量 LLC滤波 非线性控制 电压扰动 

分 类 号：TM721.1[电气工程—电力系统及自动化]