Fixed frequency integral sliding‐mode current‐controlled MPPT boost converter for two‐stage PV generation system

Abstract

In two-stage grid-integrated photovoltaic (PV) system, usually a DC-DC converter is employed between the PV modules and the inverter. The dynamic interactions between the DC-DC converter, inverter, and the maximum power point tracking (MPPT) controller may affect the system performances. This study gives an integral procedure to design a stable sliding-mode controller (SMC) based on fixed frequency equivalent control approach to improve the transient response of PV system and to track the reference voltage supplied by the voltage-oriented MPPT controller in the presence of environmental and load perturbations and converter output sinusoidal perturbations imposed by the second harmonic of the grid frequency. The controller consists of fast current tracking inner current loop based on SMC law whose sliding surface is defined by the input capacitor and inductor current and outer PI controller maintains required PV voltage regulation. The superiority of the controller is validated at different operating conditions through PSIM software and its performance is compared with variable frequency hysteresis-based SMC. To check the static and transient performances of the system, various experiments are conducted. The results obtained show very fast transient response in settling time and alleviation of chattering magnitude at various operating conditions.

DC-Link Voltage Research of Photovoltaic Grid-Connected Inverter Using Improved Active Disturbance Rejection Control

“…The front stage is connected to both ends of the DC-link capacitor via a boost circuit, realizing MPPT control. The rear stage, whose primary objective is to achieve the active power balance and grid connection, comprises a three-phase voltage source inverter, a low-pass filter, and the grid [7]. The inverter system parameters used in this study are listed in Table I.…”

High-Performance Pure Sine Wave Inverter with Robust Intelligent Sliding Mode Maximum Power Point Tracking for Photovoltaic Applications

“…Step 2: For each individual, engender a new solution according to the Equation (12). If the new solution is preferable to the old solution, supersede the old solution and augment the number of the improvement.…”

“…Most of these MPPT algorithms lack a strict stability and convergence analysis, and only provide close to the maximum power point. Sliding mode control (SMC) has been known to be insensitive to changes in internal parameters and external interferences [9][10][11][12]. That is during its sliding motion, the system trajectory is robust to uncertain intrusions; A great deal of SMC publishing literature has been applied to the control of PV systems [13][14][15][16].…”

A Modified LADRC-Based DC-Link Voltage Controller for Photovoltaic Grid-Connected Inverters

“…As the interface between renewable and the grid, grid-connected inverters play a vital role in the process of high-efficiency power conversion and high-quality power supply [3,4]. The control of the inverter is not only responsible for regulating the grid-connected current, but also must maintain a stable voltage across the dc-link capacitor [5]. Notably, if the dc-link voltage is not correctly controlled, the performance of the system would be severely degraded and even trigger related protection devices [6].…”