Model predictive control of grid-connected PV power generation system considering optimal MPPT control of PV modules

Abstract

Because of system constraints caused by the external environment and grid faults, the conventional maximum power point tracking (MPPT) and inverter control methods of a PV power generation system cannot achieve optimal power output. They can also lead to misjudgments and poor dynamic performance. To address these issues, this paper proposes a new MPPT method of PV modules based on model predictive control (MPC) and a finite control set model predictive current control (FCS-MPCC) of an inverter. Using the identification model of PV arrays, the module-based MPC controller is designed, and maximum output power is achieved by coordinating the optimal combination of spectral wavelength and module temperature. An FCS-MPCC algorithm is then designed to predict the inverter current under different voltage vectors, the optimal voltage vector is selected according to the optimal value function, and the corresponding optimal switching state is applied to power semiconductor devices of the inverter. The MPPT performance of the MPC controller and the responses of the inverter under different constraints are verified, and the steady-state and dynamic control effects of the inverter using FCS-MPCC are compared with the traditional feedforward decoupling PI control in Matlab/Simulink. The results show that MPC has better tracking performance under constraints, and the system has faster and more accurate dynamic response and flexibility than conventional PI control.

A Review on MPPT Algorithms for Solar Pv Systems

“…An enhanced adaptive P&O MPPT algorithm for solar PV systems is proposed successfully to tracks global peak under different partial shading conditions, tracking speed is increased by 2 to 3 times and achieved more than 99% efficiency Ahmed and Salam (2018). A modified P&O MPPT algorithm for solar PV array is proposed and observed improvement in steady state and dynamic state response under various atmospheres conditions and verified the performance of proposed algorithm in simulation using Matlab/Simulink software Thakurta (2020), Zhao et al (2021), Senniappan and Umapathy (2021). A modified P&O MPPT proposed for solar PV systems under partial shading conditions and found a significant improvement in accuracy and simple implementation Sarfo et al (2020).…”

Optimal PID Tuning of PLL for PV Inverter Based on Aquila Optimizer

“…The grid-connected PV inverter is applied to convert DC voltage from the DC/DC converter in Figure 1 into grid-connected alternating voltage, whose schematic configuration is illustrated as Figure 2, which is mainly consisted of a gridconnected inverter and power grid (Zhao et al, 2021).…”

“…According to Figure 2, three-phase alternating voltage for PV inverter can be calculated by (Wang et al, 2020;Zhao et al, 2021):…”

Evaluations of Practical Engineering Application of Photovoltaic Reconfiguration Technology

“…One of the main issues of the application of photovoltaic (PV) system in practice is the mismatch between PV modules caused by partial shading (PS) (Iqbal et al, 2021;Zhao et al, 2021). The consequence of this phenomenon is that the energy generated by PV array is not fully utilized, which damages PV modules, shortens the service lifetime, and leads to economic losses.…”