Sensor Effects in LCL-Type Grid-Connected Shunt Active Filters Control Using Higher-Order Sliding Mode Control...

Area of Science:

• Electrical Engineering
• Control Systems
• Power Systems

Background:

• Power quality (PQ) is critical for electric networks, especially with increasing nonlinear industrial loads.
• Shunt Active Filters (SAF) are essential for mitigating PQ issues like voltage perturbations.
• The performance of SAF is significantly influenced by the accuracy of measuring devices/sensors.

Purpose of the Study:

• To investigate the impact of measuring devices/sensors on power quality improvement using LCL-type shunt active filters (SAF).
• To enhance the performance of SAF under voltage perturbations using robust sliding mode control strategies.
• To validate the effectiveness of proposed control algorithms and sensor integration through simulations and experimental testing.

Main Methods:

• Employed robust continuous second-order sliding mode controllers (2-SMC) and continuous higher-order sliding mode controllers (C-HOSMC).
• Integrated a generalized instantaneous power identification algorithm with an advanced phase-locked loop (PLL).
• Utilized pulse-width modulation (PWM) for controller output processing and conducted simulations with industrial load data.

Main Results:

• Demonstrated the effectiveness of 2-SMC and C-HOSMC in minimizing phase shift and preventing VSI component damage.
• Validated SAF performance under severe perturbations using the proposed power identification and PLL integration.
• Confirmed the significant impact of current and voltage sensor accuracy on SAF reliability and overall power grid PQ.

Conclusions:

• Advanced sliding mode controllers ensure high-quality SAF performance even during voltage perturbations.
• Accurate sensor measurements are vital for the reliable operation of SAF and maintaining power grid quality.
• The study's findings support the validity of a recently published patent related to these power quality improvement techniques.