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Proportional-Derivative (PD) control is a widely used control method in various engineering systems to enhance stability and performance. In a system with only proportional control, common issues include high maximum overshoot and oscillation, observed in both the error signal and its rate of change. This behavior can be divided into three distinct phases: initial overshoot, subsequent undershoot, and gradual stabilization.
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Super-twisting MPPT control for grid-connected PV/battery system using higher order sliding mode observer.

Vijaya Kumar Dunna1, Kumar Pakki Bharani Chandra2, Pravat Kumar Rout3

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This study introduces a novel control strategy for photovoltaic systems to maximize power output. The combined higher order sliding mode observer-super-twisting control enhances efficiency and stability in grid-connected scenarios.

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Area of Science:

  • Electrical Engineering
  • Renewable Energy Systems
  • Control Theory

Background:

  • Photovoltaic (PV) power generation is increasing due to rising energy demands.
  • Conventional methods struggle with maximum power point tracking (MPPT) in grid-connected PV systems, facing issues like low efficiency and stability.
  • Advanced control strategies are needed to optimize power harvesting from PV arrays.

Purpose of the Study:

  • To propose a robust control strategy for enhancing maximum power point tracking (MPPT) in grid-connected photovoltaic systems.
  • To address the limitations of conventional MPPT techniques in dynamic and fault conditions.
  • To improve the overall efficiency and stability of PV power generation.

Main Methods:

  • A combined higher order sliding mode observer (HOSMO) and super-twisting control (STC) strategy is proposed.
  • A perturb and observe (P&O) technique is utilized to generate the reference voltage.
  • HOSMO is employed to estimate the inductor current for driving the STC in a PV boost converter.

Main Results:

  • The proposed HOSMO-STC controller demonstrates superior performance in terms of response time compared to existing controllers.
  • Controller effectiveness was validated across various scenarios: generation changes, dynamic faults, islanding, resynchronization, and load variations.
  • Simulations and real-time validation using OPAL-RT (OP4510) confirmed the controller's effectiveness.

Conclusions:

  • The combined HOSMO-STC offers an effective solution for MPPT in grid-connected PV systems.
  • The proposed controller enhances system stability and power harvesting efficiency under diverse operating conditions.
  • This advanced control strategy contributes to more reliable and efficient integration of PV power into the grid.