FCS‐MPC for a single‐phase two‐stage grid‐connected PV inverter

作者：Jiang Liu, Shanmei Cheng, Ying Liu, Anwen Shen · 发表于：IET Power Electronics · 年份：2019 · DOI：10.1049/iet-pel.2018.5676 · 被引用次数：29 · 研究领域：Multilevel Inverters and Converters、Photovoltaic System Optimization Techniques、Microgrid Control and Optimization

The high‐efficiency inverter in a wide input voltage range is expected to be a solution for the distributed generation system. This study gives a high‐efficiency two‐stage topology and proposes a finite‐control‐set model predictive control (FCS‐MPC) strategy. The main objectives of the proposed model predictive controller are: (i) simultaneously controlling multi‐variables in the complex buck‐boost current controller, (ii) optimal design calculation for predictive current and voltage, (iii) normalisation of the state variables for cost function formulation, and (iv) low correlation between the dc‐link capacitor and control algorithm. A more reasonable operation mode of high‐frequency switches is provided for the two‐stage topology improving system performance. In order to optimise the total harmonic distortion of the output current and the error of the dc‐link voltage, a suitable weighting factor could be designed in the proposed FCS‐MPC method. The steady‐state characteristics of the proposed controller are simulated based on MATLAB/Simulink. Experimental results demonstrate the validity and practicability of the proposed control strategy.