CAJ | 학술논문

LCL滤波器以其较好的滤波性能被广泛地用于并网逆变器,但无阻尼时系统产生谐振,给系统的稳定性控制带来困难。文中在建立三相并网逆变器数学模型的基础上,采用基于d,q同步旋转坐标系的电网电压定向控制策略,利用被动阻尼抑制谐振提高了并网逆变器的稳定性能。文中给出了被动阻尼LCL滤波器的详细设计方法,并比较其与单L滤波器的滤波效果,运用Matlab/simulink建立系统模型并进行仿真,实现了单位功率因数并网。
LCL려파기이기교호적려파성능피엄범지용우병망역변기,단무조니시계통산생해진,급계통적은정성공제대래곤난。문중재건립삼상병망역변기수학모형적기출상,채용기우d,q동보선전좌표계적전망전압정향공제책략,이용피동조니억제해진제고료병망역변기적은정성능。문중급출료피동조니LCL려파기적상세설계방법,병비교기여단L려파기적려파효과,운용Matlab/simulink건립계통모형병진행방진,실현료단위공솔인수병망。
LCL filter is widely used in grid-connected inverter for its good filtering performance.But under the undamped condition,resonance will be caused in the system,and then it can bring difficulties for the stability control of the system.On the basis of the mathematics model of three-phase grid-connected inverter,a novel approach was proposed in this paper,to adopt voltage directional power control which is based on dq synchronization rotating reference frame,and inhabit resonance by passive damping to get better performance of the grid-connected inverter.This paper gives the detail design of passive damping LCL filter,and compares with the filtering effect of the single-L filter,builds system model by simulation in Matlab/Simulink and realizes unity factor to be grid-connected.