Direct Power Model Predictive Control Method for DC-Side Sensor-Less Single-Phase Cascaded H-Bridges Photovoltaic Inverters

doi:10.11930/j.issn.1004-9649.202005068

Abstract

Abstract: In order to reduce the complexity of photovoltaic generation system, a direct power model predictive control method suitable for DC-side sensor-less photovoltaic inverters is presented in this paper. Based on the idea of serial calculation, each H-bridge is considered as a single inverter. In the meantime, when the optimal modulation function is being calculated for each H-bridge, the DC-side capacitor voltage of each H-bridge is reconstructed using the increment of output voltage of inverters. In addition, a term about the error of capacitor voltage is embedded into the optimal modulation function to keep capacitors’ voltages balance. After building a system model through Matlab/Simulink, the performance of the presented method is verified.

Key words: photovoltaic inverter, DC-side sensor-less, capacitor voltage balance, direct power control, model predictive control

ZHANG Xi, MAO Yipeng, YU Le, YANG Hao. Direct Power Model Predictive Control Method for DC-Side Sensor-Less Single-Phase Cascaded H-Bridges Photovoltaic Inverters[J]. Electric Power, 2022, 55(2): 172-180.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202005068

https://www.electricpower.com.cn/EN/Y2022/V55/I2/172

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