摘要
并网逆变器是分布式电源和微电网中的重要部分。文中针对一种带有LC滤波器和隔离变压器的并网逆变器拓扑进行了研究,建立了其完整的数学模型。利用加权电流反馈方法实现了其模型降阶,详细分析了参数变化对降阶模型和闭环系统稳定性的影响,并在此基础上设计了滑模变结构控制器。所提方法可以较好地解决该类并网逆变器模型阶数过高给控制器设计带来的困难。最后,利用PSCAD/EMTDC综合分析程序验证了所提方法的正确性和有效性。
Grid-connected inverters are important components of distributed generation systems and microgrids.A grid-connected inverter topology with LC filter and isolation transformer is investigated.It has a high order mathematical model and is hard to control.Its reduced model is obtained by the defined ＂virtual feedback current＂,which is useful for the controller design of proposed topology.Moreover,how the variable parameters affect the reduced model is studied in detail.According to the reduced model,a sliding mode variable structure control is designed.The correctness and effectiveness of the proposed approach is verified using PSCAD/EMTDC.
出处
《电力系统自动化》
EI
CSCD
北大核心
2012年第3期47-53,共7页
Automation of Electric Power Systems
基金
国家自然科学基金资助项目(50907060)
中国博士后科学基金资助项目(20090451438)~~
关键词
并网逆变器
LC滤波
隔离变压器
模型降阶
滑模变结构控制
grid-connected inverter
LC filter
isolation transformer
model reduction
sliding mode variable structure control
