基于RBFNN稳态逆模型的多端柔性多状态开关平滑切换策略  

Smooth switching strategy of multi-terminal flexible multi-state switch based on RBFNN steady-state inverse model

作　　者：任洁 刘桂英[1] 粟时平[1] 蔡明君 REN Jie;LIU Guiying;SU Shiping;CAI Mingjun(School of Electrical and Information Engineering,Changsha University of Science and Technology,Changsha 410002,China)

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410002

出　　处：《电测与仪表》2024年第10期167-174,共8页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(51777015,51708194)。

摘　　要：直流母线电压的稳定是柔性多状态开关正常运行的关键。柔性多状态开关(FMS)多工作模式的硬切换会导致直流母线电压产生剧烈波动,而采用平滑切换是实现母线电压稳定的最有效途径。文章详细分析了稳态逆模型平滑切换的原理,然后,针对其不足,深入研究了径相基函数神经网络(RBFNN)稳态逆模型平滑切换技术,给出了运用RBFNN改进稳态逆模型平滑切换的原理,进行了详细的实验验证。理论分析和实验结果显示,通过RBFNN控制修正PI输出来补偿扰动对系统的影响,将修正后的PI输出与稳态逆模型输出叠加生成内环参考值,有效平缓切换瞬间母线电压的振荡,能够实现直流母线电压波动小、响应速度快、动态特性佳、适应工况广等优点。The stability of DC bus voltage is the key to the normal operation of flexible multi-state switch.The hard switching of multiple working modes of flexible multi-state switch(FMS)will lead to violent fluctuation of DC bus voltage,and the smooth switching is the most effective way to realize bus voltage stability.The principle of smooth switching of steady-state inverse model is analyzed in detail.Then,in view of its shortcomings,the smooth switching technology of steady-state inverse model of radial basis function neural network(RBFNN)is deeply studied,and the principle of using RBFNN to improve the smooth switching of steady-state inverse model is given.Detailed experimental verification is carried out.The theoretical analysis and experimental results show that the modified PI output is controlled by RBFNN to compensate the influence of disturbance on the system,and the modified PI output is superimposed with the steady-state inverse model output to generate the inner-loop reference value,which can effectively smooth the oscillation of bus voltage at the moment of switching,and can realize the advantages of small voltage fluctuation of DC bus,fast response speed,good dynamic characteristics and wide adaptability to working conditions.

关 键 词：柔性多状态开关 平滑切换 稳态逆模型 RBFNN 

分 类 号：TM73[电气工程—电力系统及自动化]