摘要
LCL 型滤波器以其优越的高频衰减性能在变流器中得以普遍应用。针对 LCL 滤波器应用于军队电源系统时出现的谐振尖峰现象,因此,使用常见的电容阻尼方法和分裂电容阻尼方法对该类型的滤波器作出相应的改进,为观测改进后的效果,从阻尼效果及功率损耗两个评判指标对上述两种方法开展分析研究工作。提出一种特殊的控制策略,该策略外环使用自抗扰控制,内环使用 PI 控制。以所提出的控制策略为基础,对两种不同阻尼方法下的滤波器进行仿真研究,仿真的结果显示,分裂电容阻尼方法对减少 LCL 滤波器所引发的谐振有更好的抑制作用,降低了并网电流的谐波畸变率,证明了设计的有效性和优越性。
LCL filter is widely used in converter with its superior high frequency attenuation. Aiming at the problem of resonance spike when LCL filter is applied in military power system,the traditional capacitance damping method and the split capacitance damping method are used to improve the LCL filter respectively. From the two aspects of damping effect and power loss,the two different types of passive damping method were analyzed. A double closed -loop control strategy based on PI control is proposed. The LCL filter under two different damping methods is simulated based on the proposed control strategy. The simulation results show that the split capacitance damping method can effectively reduce the resonance caused by LCL filter and reduce the total harmonic distortion rate of grid-connected current,which proves the rationality and validity of analysis and design.
作者
张瑞成
安然
李春玲
ZHANG Rui-cheng;AN Ran;LI Chun-ling(School of Electrical Engineering,North China University of Science and Technology,Tangshan 063210,China)
出处
《火力与指挥控制》
CSCD
北大核心
2019年第5期97-101,共5页
Fire Control & Command Control
基金
河北省自然科学基金(F2018209201)
华北理工大学杰出青年基金资助项目(JP201301)
关键词
光伏并网
自抗扰
滤波器
无源阻尼
谐波
photovoltaic grid
auto disturbance rejection
filter
passive damping
harmonic
