A Model Predictive Direct Power Control Method for Photovoltaic Grid-Connected Inverter

doi:10.11985/2016.06.003

Abstract

Abstract:

Based on the instantaneous power theory, power predictive model of photovoltaic grid connected inverter in dq rotating coordinates is established. The output active power and reactive power of the grid-connected can be directly predicted by using the predictive model. The model predictive direct power control strategy of photovoltaic grid connected inverter is designed. According to the power predictive model and cost function, the optimal space voltage vector is selected. The proposed control strategy does not need PWM modulation module and the inner current control. It has low computational complexity and is easy to be implemented. The control system performance is simulated in different light intensity conditions. The simulation results show that the grid-connected inverter can track illumination change and output power with good dynamic and static performance, which validate the effectiveness of proposed control strategy.

Key words: Photovoltaic power generation, grid-connected inverter, predictive model, direct power predictive control

CLC Number:

TM464

Jing Nan,Deng Xuanxuan,Cui Guangzhao,Dou Zhifeng. A Model Predictive Direct Power Control Method for Photovoltaic Grid-Connected Inverter[J]. Journal of Electrical Engineering, 2016, 11(6): 13-18.

Figures/Tables 7

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参数	数值
直流母线电压U_dc/V	380
光伏电池板开路电压U_d/V	468
网侧滤波电感L/mH	15
电网相电压e/V	150
电网频率f/Hz	50
直流母线电容C/μF	3 000
采样频率f_s/kHz	20