摘要
弱电网下并网逆变器的鲁棒性较差、谐波较大,而模型预测控制十分依赖系统参数,这限制了其在弱电网中的应用。针对以上问题,提出适用于NPC(二极管中点钳位)型三电平并网逆变器的数据驱动型V-MFPC(基于虚拟电压矢量的无模型预测控制)策略。首先通过不同的开关序列构造大量虚拟电压矢量,然后利用代价函数预选降低控制算法的计算负担,最后选择合适的开关序列寻优抑制中性点电压波动。仿真结果表明,所提策略能有效抑制中性点电压波动和并网电流谐波,并具有较好的参数鲁棒性。
In weak power grids,grid-connected inverters often suffer from poor robustness and significant harmonics.Moreover,model predictive control(MPC)heavily relies on system parameters,limiting its applicability in weak grids.To address these issues,a data-driven model-free predictive control(MFPC)strategy base on virtual voltage vectors for neutral-point clamped(NPC)three-level grid-connected inverters is proposed.Firstly,the MFPC based on virtual voltage vectors constructs numerous virtual voltage vectors through different switching sequences.Then,a cost function is utilized to pre-select and reduce the computational burden of the control algorithm.Finally,appropriate switching sequences are chosen for optimization to suppress neutral-point voltage fluctuations.Simulation results demonstrate that the proposed strategy effectively mitigates neutral-point voltage fluctuations and grid current harmonics,while exhibiting robustness to parameter variations.
作者
赵磊磊
牟伟
宋慧庆
张民
王珊
ZHAO Leilei;MU Wei;SONG Huiqing;ZHANG Min;WANG Shan(Yantai Automobile Engineering Professional College,Yantai,Shandong 265500,China;State Grid Dongyang Power Supply Company,Dongyang,Zhejiang 322100,China;Qingdao University of Technology,Qingdao,Shandong 266520,China)
出处
《浙江电力》
2024年第6期61-68,共8页
Zhejiang Electric Power
基金
山东省自然科技基金面上项目(ZR2022ME214)
烟台汽车工程职业学院规划课题研究项目(YTQC2022ZRKX08)。
