摘要
利用回路电流法推导了现有的LCL、LLCL、LCCL、LLCCL、L(LCL)2型滤波器逆变器侧电压到电网侧电流的传递函数。对于这5种高阶无源滤波器,在幅频域下,从谐波抑制效果和谐振特性两方面分别进行深入研究。利用Rd和Rd-Cd阻尼法对高阶滤波器可能存在的谐振点进行谐振抑制,针对含有双并联谐振支路的高阶无源滤波器进行不同支路阻尼效果对比分析,并确定最佳阻尼支路。通过仿真对理论分析的正确性进行验证,表明L(LCL)2型滤波器谐波抑制效果最佳,同时可以缩小器件尺寸并降低器件的成本造价。
The inverter side voltage to grid side current transfer functions of the existing LCL,LLCL,LCCL,LLCCL and L(LCL)2 filters are derived by loop current method. The harmonic suppression effect and resonance characteristics of these five high-order passive filters are deeply studied in amplitude-frequency domain. The possible resonance points of the high-order filter are suppressed by Rd and Rd-Cd damping methods. The different branch damping effects for high-order passive filters with double parallel resonant branches are comparatively analyzed,and the optimal damping branch is determined. The correctness of theoretical analysis is verified by simulation,which shows that the L(LCL)2 filter has the best harmonic suppression effect while reducing the size and cost of the device.
作者
吕志鹏
吴鸣
宋振浩
赵婷
杜刚
LV Zhipeng;WU Ming;SONG Zhenhao;ZHAO Ting;DU Gang(China Electric Power Research Institute, Beijing 100192, China;School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)
出处
《电力自动化设备》
EI
CSCD
北大核心
2019年第6期54-60,共7页
Electric Power Automation Equipment
基金
国家自然科学基金资助项目(51877201)
国家电网公司科技项目(以电为核心多能互补集成功率变换装备关键技术及实证研究)~~
关键词
无源滤波器
谐波抑制
谐振抑制
开关频率
电能质量
passive filters
harmonic suppression
resonance suppression
switching frequency
power quality
