LCL滤波的并网变换器中阻尼电阻影响分析  

Impact of Damping Resistance on Grid Inverter with LCL-filter

作　　者：赵仁德[1] 赵强[1] 李芳[2] 王平[1] 

机构地区：[1]中国石油大学(华东)信息与控制工程学院,东营257061 [2]山东科技大学信息与电气工程学院,青岛266510

出　　处：《电力系统及其自动化学报》2009年第6期112-116,共5页Proceedings of the CSU-EPSA

摘　　要：为明确LCL滤波的并网变换器中阻尼电阻对系统稳定性、滤波效果及功率损耗的影响,根据三相并网型变换器的数学模型,推导了电流环S域和Z域的传递函数,通过Z域系统极点变化情况分析了阻尼电阻对系统稳定性的影响;根据系统S域传递函数的波特图分析了阻尼电阻对滤波效果的影响;建立了Matlab/Simulink仿真模型,对系统稳定性和阻尼电阻对功率损耗的影响进行仿真。由分析可知,对于阻尼电阻选择,应在满足系统稳定性和滤波效果的情况下,尽量降低电阻的阻值。In order to clarify the influence of the damping resistance on system stability, filtering effect and power loss,the transfer function in S and Z domain according to the model of the three-phase voltage grid converter was acquired. This paper has analyzed the damping resitance＇s impact on system stability according to the variation of zero-pole in Z domain,and analyzed the filtering effect by the S domain variation of transfer function bode diagram. The filtering effect is analyzed by the variation of transfer function bode diagram. The system stability and loss of damping resistance was simulated in Matlab/Simulink,which shows that the choice of damping resistors should meet the system stability and filtering effect, and the resistance value should be reduced.

关 键 词：阻尼电阻 LCL滤波器 稳定性 滤波效果 功率损耗 

分 类 号：TM46[电气工程—电器]