微电网弱约束容性等效输出阻抗逆变器控制方法  

Weakly-constrained control of microgrid inverter with capacitive equivalent output impedance

作　　者：曹一家[1] 郑玉芳[1] 于晶荣[2] 段娟凤 章文远 

机构地区：[1]湖南大学电气与信息工程学院,湖南长沙410082 [2]中南大学信息科学与工程学院,湖南长沙410083

出　　处：《电力自动化设备》2016年第2期1-4,10,共5页Electric Power Automation Equipment

基　　金：国家自然科学基金重点资助项目(61233008);国际科技合作计划项目(2012DFA70580)~~

摘　　要：绝大多数逆变器在低频时为感性输出阻抗。提出一种结合电感-电容-电感(LCCL)滤波器配置、采样电流选取以及虚拟阻抗控制器设计的控制策略,其为逆变微源等效输出阻抗建模提供一个可控自由度,使逆变器等效输出阻抗为容性阻抗。针对所提的LCCL滤波器,选取裂解点电流为采样电流,能够有效降低电流控制系统的阶次。同时,通过对LCCL滤波器电感、电容的配置,获得合理的虚拟阻抗控制器,使得逆变器的等效输出阻抗为纯容性。最后,对比仿真实验验证了所提控制方案的有效性。As most inverters have the inductive output impedance at low frequencies,a strategy of inverter control,including the LCCL filter configuration,sampling current selection and virtual impedance controller design,is proposed to make its output impedance capacitive by providing a controllable degree of freedom for its output impedance model,which splits the capacitor of LCL filter into two parts and takes the current flowing between them as the sampling current to effectively reduce the order of current control system. The inductors and capacitors of LCCL filter are properly configured to achieve a reasonable virtual impedance controller for making the inverter equivalent output impedance capacitive. The effectiveness of the proposed control strategy is verified by the simulative results.

关 键 词：微电网 逆变器 容性逆变器 LCCL滤波器 虚拟阻抗 

分 类 号：TM721[电气工程—电力系统及自动化] TM464