电源学报2024，Vol.22Issue(2)：147-157,11.DOI:10.13234/j.issn.2095-2805.2024.2.147
NPC三电平虚拟同步机桥臂故障容错模型预测控制
Fault-tolerant Model Predictive Control for Bridge Arm of NPC Three-level Virtual Synchronous Generator
摘要
Abstract
A virtual synchronous generator(VSG)can provide inertia and damping for the grid connection of new en-ergy by simulating the characteristics of a synchronous generator.However,a circuit breaking fault may occur in the process of high-frequency switching of power electronic switching devices,which will lead to a serious distortion of out-put current waveform and affect the safe and stable operation of power grid.In this paper,a VSG fault-tolerant model predictive control strategy based on neutral point voltage equalization is proposed to solve the fault problem of neutral point clamped(NPC)three-level VSG bridge arm.The operation mechanism of NPC three-level VSG single-phase bridge arm after fault is analyzed.The DC-side capacitor forms a virtual bridge arm after the switching device fault,which is reconstructed as a VSG bridge arm fault-tolerant structure.Under fault conditions,a current predictive model is estab-lished,and the space voltage vector in a fault state is reconstructed.The neutral point capacitor voltage on the DC-side is introduced into the cost function of fault-tolerant model to reduce capacitor voltage fluctuations and realize the fault-tolerant operation of VSG bridge arm.Experimental results show that the NPC three-level VSG can operate continuously after the switching device fault,which verifies the effectiveness of the proposed model predictive fault-tolerant control strategy and improves the operation reliability of VSG.关键词
虚拟同步机/容错模型/模型预测控制/中点钳位型变换器/代价函数Key words
Virtual synchronous generator(VSG)/fault-tolerant model/model predictive control/neutral point clamped(NPC)converter/cost function分类
信息技术与安全科学引用本文复制引用
金楠,肖晗,谢欢,武洁..NPC三电平虚拟同步机桥臂故障容错模型预测控制[J].电源学报,2024,22(2):147-157,11.基金项目
国家自然科学基金资助项目(U2004166) （U2004166）
河南省重点研发与推广专项(科技攻关)资助项目(202102210103)This work is supported by National Natural Science Foundation of China under the grant U2004166 （科技攻关）
Henan Province Key Re-search and Development and Promotion of Special Projects(Sci-ence and Technology)under the grant 202102210103 （Sci-ence and Technology）
