Abstract
Photovoltaic (PV) power generation is the main aspect of new energy power generation, and it is an important means to achieve the goal of carbon neutrality. When the PV system is connected to the grid, the nonlinear load of the grid will affect the power quality and consume reactive power. This paper proposes a PV power generation grid-connected system to improve power quality, with an active power filter (APF) function. Through the maximum power point tracking (MPPT) method, PV power generation can operate at the maximum power point and play the function of harmonic and reactive power compensation at the load side. To improve the dynamic performance of the grid-connected PV system and harmonic compensation simultaneously, multistep finite control set model predictive control (FCS-MPC) is adopted for the grid-connected module. The whole system does not need additional equipment, as it plays the role of two devices and effectively reduces the input cost. In this paper, the proposed structure and multistep FCS-MPC are verified in MATLAB/Simulink. The results show that the system injects the maximum power into the power grid at the same time when the load changes and compensates the harmonic generated by the nonlinear load of the power grid so that the total harmonic distortion of the power grid can meet the operation standard, and the system has good dynamic performance and steady-state performance.
Highlights
Renewable energy power generation is the primary means to solve the global environmental problems and energy crisis
SVM classifier is used to optimize the historical weather data, which improves the accuracy of prediction. e direct current generated by the PV power generation array is controlled by maximum power point tracking (MPPT) to keep the maximum power output, and the PV grid-connected system supplies the direct current to the grid or load through the inverter [1, 5,6,7,8]
To compensate for the power grid harmonic pollution caused by the nonlinear load, the control schematic diagram is shown in Figure 4. e PV + active power filter (APF) system proposed in this paper uses light as the inverter and compensates for harmonics
Summary
Renewable energy power generation is the primary means to solve the global environmental problems and energy crisis. A method of the grid-connected PV power generation and harmonic compensation is proposed. Previous work [19] has pointed out that FCS-MPC was applied to an APF to compensate for the harmonic current and reactive power. A nonlinear control system based on the Lyapunov stability theory is designed for a three-level NPC inverter in [20], which ensures the grid connection of a PV system and the improvement of power quality. The variable compensation disturbance observation method is used to realize the maximum power point tracking of PV power generation. Is method can obtain the maximum power point voltage reference value of PV cells under certain external environments. When dP and du reach the set threshold, the disturbance step is zero; that is, there is no power fluctuation in the steady state
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