电机与控制应用2024，Vol.51Issue(11)：75-83,中插8,10.DOI:10.12177/emca.2024.115
基于MPC的虚拟同步双馈风机并网系统次同步振荡抑制策略
Sub-Synchronous Oscillation Suppression Strategy for Virtual Synchronous DFIG Grid-Connected Systems Based on MPC
摘要
Abstract
[Objective]The introduction of virtual synchronous control complicates the sub-synchronous oscillation between double-fed induction generator(DFIG)and line compensation devices.To address this issue,a sub-synchronous oscillation suppression strategy based on model predictive control(MPC)for a virtual synchronous DFIG grid-connected system is proposed.[Method]First,the second-order expressions of virtual inertia and damping were derived from the virtual synchronous generator(VSG)impedance model,and the impact of parameter variations on sub-synchronous oscillations in the grid-connected system was investigated from the perspective of impedance characteristics.Second,using a three-phase two-level voltage equation with switching functions,the prediction functions of active and reactive power output from the converter were derived.A direct power predictive inner-loop control based on MPC was established to achieve optimal control with minimum power fluctuation.Finally,the MPC_VSG control strategy was analyzed using the frequency sweep method.[Results]The proposed MPC_VSG control strategy was verified by hardware-in-loop experiment based on RT-LAB.The results demonstrated that,under different series compensation levels and wind speeds,the MPC_VSG control strategy can suppress sub-synchronous oscillations within 0.5 seconds,and exhibits strong robustness.[Conclusion]The MPC_VSG control strategy designed in this paper selects the optimal switching state by targeting minimal power fluctuations,achieving the subsynchronous oscillation effective suppression.关键词
双馈风机/虚拟同步发电机/模型预测控制/次同步振荡/最优控制Key words
double-fed induction generator/virtual synchronous generator/model predictive control/sub-synchronous oscillation/optimal control分类
信息技术与安全科学引用本文复制引用
刘志坚,王伟铭,骆军,李明..基于MPC的虚拟同步双馈风机并网系统次同步振荡抑制策略[J].电机与控制应用,2024,51(11):75-83,中插8,10.基金项目
国家重点研发计划项目(2022YFB2703500) （2022YFB2703500）
云南省基础研究计划资助项目(202301AS070055)National Key R&D Program of China(2022YFB2703500) （202301AS070055）
Key Basic Research Projects in Yunnan Province(202301AS070055) （202301AS070055）
