Finite Control Set Model Predictive Control for an LCL-Filtered Grid-Tied Inverter with Full Status Estimations under Unbalanced Grid Voltage

Energies

HenryShu-Hung Chung¹  Ning Gao²  Jiahao Liu²  Xiaotao Chen²  Weimin Wu²  Frede Blaabjerg³ 

[1] Department of Electronic Engineering, City University of Hong Kong, Hong Kong 999077, China;Department of Electronic Engineering, Shanghai Maritime University, Shanghai 201306, China;Department of Energy Technology, Aalborg University, DK-9220 Aalborg, Denmark;

关键词: finite control set model predictive control (FCS-MPC);    full status estimations;    grid voltage observer (GVO);    inductance-capacitance-inductance (LCL)-filtered grid-tied inverter;    Luenberger observer;   

DOI  :  10.3390/en12142691

来源: DOAJ

【 摘 要 】

This paper proposes a novel finite control set model predictive control (FCS-MPC) strategy with merely grid-injected current sensors for an inductance-capacitance-inductance (LCL)-filtered grid-tied inverter, which can obtain a sinusoidal grid-injected current whether three-phase grid voltages are balanced or not. Compared with the conventional FCS-MPC method, four compositions are added in the proposed FCS-MPC algorithm, where the grid voltage observer (GVO) and Luenberger observer are combined together to achieve full status estimations (including grid voltage, capacitor voltage, inverter-side current, and grid-injected current), while the sequence extractor and the reference generator are applied to eliminate the double frequency ripples of the active or reactive power, or the negative sequence component (NSC) of the grid-injected current caused by the unbalanced grid voltage. Simulation model and experimental platform are established to verify the effectiveness of the proposed FCS-MPC strategy, with full status estimations under both balanced and unbalanced grid voltage conditions.

【 授权许可】

Unknown